Multi-transformation ratio current transformer test tool

Abstract

The utility model relates to a multi-transformation ratio current transformer test tool, which is used for carrying out turn-to-turn overvoltage, FS / ALF and error tests on a secondary winding of a transformer, and comprises a first output unit, at least one second output unit, a third output unit and at least one fourth output unit. The device has the advantages that the device is compact in design and convenient to move, and when the turn-to-turn overvoltage, FS / ALF and error tests of the multi-transformation-ratio current transformer are tested, only primary and secondary winding wiring needs to be connected, so that the trouble of changing and wiring for multiple times at each transformation ratio is avoided; the tool is high in efficiency, stable in work, not prone to damage, standardized in component and easy to maintain, and the problems that traditional work is complex in operation, poor in stability, difficult to maintain and the like are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer testing, in particular to a testing tooling for a multi-ratio current transformer. Background Art

[0002] The detection of transformer performance is an important means for the process control and quality assurance of transformer production and manufacturing, and is also a guarantee for ensuring the safe and stable operation of transformers in the system. The detection of current transformers includes tests on aspects such as insulation performance, error, and volt-ampere curve. Since most transformers have many secondary windings, and even the secondary windings have intermediate taps, with up to 10 ratios, and there are also various combinations of primary windings, this leads to frequent and cumbersome replacement of connection wires for inter-turn overvoltage, FS / ALF, and error tests of transformers. In the past few decades, for the inter-turn overvoltage, FS / ALF, and error tests of multi-ratio current transformers in high-voltage transformers, there are more than 6 windings, with up to 10 current ratios for each winding, and the connection wires need to be replaced once for each ratio, resulting in a waste of time and low efficiency.

[0003] At present, the vast majority of transformer manufacturers and testing institutes of electric power research academies in China adopt the manual connection wire replacement method, with frequent test wiring and complex test steps.

[0004] At present, in view of the problems of manual wire replacement, frequent test wiring, and complex test steps in the related art, no effective solution has been proposed. Summary of the Utility Model

[0005] The purpose of this application is to provide a testing tooling for a multi-ratio current transformer aiming at the deficiencies in the prior art, so as to at least solve the problems of manual wire replacement, frequent test wiring, and complex test steps in the related art.

[0006] To achieve the above purpose, the technical solution adopted by this application is:

[0007] The utility model provides a testing tooling for a multi-ratio current transformer, which is arranged in a test area and is used for conducting inter-turn overvoltage, FS / ALF, and error tests on the secondary winding of the transformer. The secondary winding of the transformer includes at least 3 terminals, and it includes:

[0008] A first output unit, the first output unit includes at least 3 first-type terminals and at least 3 second-type terminals, and at least 1 second-type terminal of the first output unit is connected to the starting terminal of at least 1 secondary winding of the transformer;

[0009] At least one second output unit, the second output unit including at least 3 first type terminals and at least 3 second type terminals, the first type terminals of the second output unit being connected in series with the first type terminals of the first output unit to form a common terminal, at least 1 second type terminal of the second output unit being connected to the middle terminal of at least 1 secondary winding of a current transformer, wherein the number of the first type terminals of the second output unit is equal to the number of the first type terminals of the first output unit;

[0010] A third output unit, the third output unit including at least 3 first type terminals and at least 3 second type terminals, at least 1 second type terminal of the third output unit being connected to the end terminal of at least 1 secondary winding of a current transformer, wherein the number of the second type terminals of the third output unit is equal to the number of the second type terminals of the first output unit;

[0011] At least one fourth output unit, the fourth output unit including at least 3 first type terminals and at least 3 second type terminals, the first type terminals of the fourth output unit being connected in series with the first type terminals of the third output unit in one-to-one correspondence, the second type terminals of the fourth output unit being connected in parallel with the second type terminals of the second output unit in one-to-one correspondence, at least 1 second type terminal of the fourth output unit being connected to the middle terminal of at least 1 secondary winding of a current transformer, wherein the number of the first type terminals of the fourth output unit is equal to the number of the first type terminals of the third output unit, and the number of the second type terminals of the fourth output unit is equal to the number of the second type terminals of the second output unit.

[0012] In some embodiments thereof, the first output unit includes:

[0013] At least one first contact element, the first contact element including 3 first type terminals and 3 second type terminals, the first type terminals of the first contact element being connected in series with the first type terminals of the second output unit, and at least 1 second type terminal of the first contact element being connected to the starting terminal of at least 1 secondary winding of a current transformer.

[0014] In some embodiments thereof, the first contact element includes:

[0015] A first contactor;

[0016] A first output terminal, the first output terminal being disposed on the first contactor and connected in series with the first type terminals of the second output unit;

[0017] A second output terminal, the second output terminal being disposed on the first contactor and connected in series with the first output terminal and the first type terminals of the second output unit respectively;

[0018] A third output terminal, which is disposed on the first contactor and is respectively connected in series with the first output terminal, the second output terminal, and the first type of terminals of the second output unit;

[0019] A first input terminal, which is disposed on the first contactor and is connected to the starting terminal of the secondary winding of one current transformer;

[0020] A second input terminal, which is disposed on the first contactor and is connected to the starting terminal of the secondary winding of one current transformer;

[0021] A third input terminal, which is disposed on the first contactor and is connected to the starting terminal of the secondary winding of one current transformer;

[0022] Wherein, the first input terminal, the second input terminal, and the third input terminal are respectively connected to the secondary windings of three different current transformers.

[0023] In some embodiments, the second output unit includes:

[0024] At least one second contact element, which includes three first type of terminals and three second type of terminals. The first type of terminals of the second contact element are respectively connected in series with the first type of terminals of the first output unit. The second type of terminals of the second contact element are correspondingly connected in parallel with the second type of terminals of the fourth output unit. At least one of the second type of terminals of the second contact element is connected to the middle terminal of at least one secondary winding of a current transformer.

[0025] In some embodiments, the second contact element includes:

[0026] A second contactor;

[0027] A fourth output terminal, which is disposed on the second contactor and is connected in series with the first type of terminals of the first output unit;

[0028] A fifth output terminal, which is disposed on the second contactor and is respectively connected in series with the fourth output terminal and the first type of terminals of the first output unit;

[0029] A sixth output terminal, which is disposed on the second contactor and is respectively connected in series with the fourth output terminal, the fifth output terminal, and the first type of terminals of the first output unit;

[0030] A fourth input terminal, which is disposed on the second contactor, is connected in parallel with the corresponding second type of terminals of the fourth output unit, and is connected to the middle terminal of one secondary winding of a current transformer;

[0031] A fifth input terminal, which is disposed on the second contactor, is connected in parallel with corresponding second-type terminals of the fourth output unit, and is connected to an intermediate terminal of a secondary winding of one current transformer;

[0032] A sixth input terminal, which is disposed on the second contactor, is connected in parallel with corresponding second-type terminals of the fourth output unit, and is connected to an intermediate terminal of a secondary winding of one current transformer;

[0033] Wherein, the fourth input terminal, the fifth input terminal, and the sixth input terminal are respectively connected to three different secondary windings of current transformers.

[0034] In some embodiments, the third output unit includes:

[0035] At least one third contact element, which includes three first-type terminals and three second-type terminals. The first-type terminals of the third contact element are respectively connected in series with the first-type terminals of the fourth output unit in one-to-one correspondence, and at least one second-type terminal of the third contact element is connected to an end terminal of a secondary winding of at least one current transformer.

[0036] In some embodiments, the third contact element includes:

[0037] A third contactor;

[0038] A seventh output terminal, which is disposed on the third contactor and is connected in series with the corresponding first-type terminal of the fourth output unit;

[0039] An eighth output terminal, which is disposed on the third contactor and is connected in series with the corresponding first-type terminal of the fourth output unit;

[0040] A ninth output terminal, which is disposed on the third contactor and is connected in series with the corresponding first-type terminal of the fourth output unit;

[0041] A seventh input terminal, which is disposed on the third contactor and is connected to an end terminal of a secondary winding of one current transformer;

[0042] An eighth input terminal, which is disposed on the third contactor and is connected to an end terminal of a secondary winding of one current transformer;

[0043] A ninth input terminal, which is disposed on the third contactor and is connected to an end terminal of a secondary winding of one current transformer;

[0044] Among them, the seventh input terminal, the eighth input terminal, and the ninth input terminal are respectively connected to three secondary windings of different current transformers.

[0045] In some embodiments thereof, the fourth output unit includes:

[0046] At least one fourth contact element, the fourth contact element includes three first type terminals and three second type terminals, the first type terminals of the fourth contact element are respectively connected in series with the first type terminals of the third output unit in one-to-one correspondence, the second type terminals of the fourth contact element are respectively connected in parallel with the second type terminals of the second output unit in one-to-one correspondence, and at least one second type terminal of the fourth contact element is connected to the middle terminal of at least one secondary winding of the current transformer.

[0047] In some embodiments thereof, the fourth contact element includes:

[0048] A fourth contactor;

[0049] A tenth output terminal, the tenth output terminal is arranged on the fourth contactor and is connected in series with the corresponding first type terminal of the third output unit;

[0050] An eleventh output terminal, the eleventh output terminal is arranged on the fourth contactor and is connected in series with the corresponding first type terminal of the third output unit;

[0051] A twelfth output terminal, the twelfth output terminal is arranged on the fourth contactor and is connected in series with the corresponding first type terminal of the third output unit;

[0052] A tenth input terminal, the tenth input terminal is arranged on the fourth contactor, and is connected in parallel with the corresponding second type terminal of the second output unit and is connected to the middle terminal of one secondary winding of the current transformer;

[0053] An eleventh input terminal, the eleventh input terminal is arranged on the fourth contactor, and is connected in parallel with the corresponding second type terminal of the second output unit and is connected to the middle terminal of one secondary winding of the current transformer;

[0054] A twelfth input terminal, the twelfth input terminal is arranged on the fourth contactor, and is connected in parallel with the corresponding second type terminal of the second output unit and is connected to the middle terminal of one secondary winding of the current transformer;

[0055] Among them, the tenth input terminal, the eleventh input terminal, and the twelfth input terminal are respectively connected to three secondary windings of different current transformers.

[0056] In some embodiments thereof, it further includes:

[0057] A lead-out unit, the lead-out unit is respectively connected to the first output unit, at least one of the second output units, the third output unit, at least one of the fourth output units, and at least one secondary winding of the current transformer.

[0058] In some of the embodiments, the lead-out unit includes:

[0059] A first lead-out element, the first lead-out element is respectively connected to the first type of terminals of the first output unit and the first type of terminals of at least one of the second output units;

[0060] At least three second lead-out elements, the second lead-out elements are respectively connected to the second type of terminals of the first output unit in one-to-one correspondence;

[0061] At least three third lead-out elements, the third lead-out elements are respectively connected to the second type of terminals of the second output unit and the second type of terminals of the fourth output unit in one-to-one correspondence;

[0062] At least three fourth lead-out elements, the fourth lead-out elements are respectively connected to the first type of terminals of the third output unit and the first type of terminals of the fourth output unit in one-to-one correspondence;

[0063] At least three fifth lead-out elements, the fifth lead-out elements are respectively connected to the second type of terminals of the third output unit in one-to-one correspondence;

[0064] At least three sixth lead-out elements, the sixth lead-out elements are respectively connected to the second type of terminals of the fourth output unit in one-to-one correspondence.

[0065] In some of the embodiments, it further includes:

[0066] A clamping unit, the clamping unit is arranged at the end of the lead-out unit.

[0067] In some of the embodiments, it further includes:

[0068] A cable unit, the cable unit is respectively connected to the first output unit, at least one of the second output units, the third output unit, at least one of the fourth output units, and the working power supply.

[0069] In some of the embodiments, it further includes:

[0070] A first switch unit, the first switch unit is respectively connected to the first output unit, at least one of the second output units, and the cable unit;

[0071] A second switch unit, the second switch unit is respectively connected to the third output unit, at least one of the fourth output units, and the cable unit.

[0072] Compared with the related art, the variable ratio current transformer test tooling provided by the embodiments of the present application is compact in design and convenient to move. When testing the inter-turn overvoltage, FS / ALF, and error test of the variable ratio current transformer, only the secondary winding wiring needs to be connected once, avoiding the trouble of changing the wiring multiple times for each ratio; it has high efficiency, the tooling works stably and is not easily damaged, the components are standardized and easy to repair, solving the problems of complex traditional operation, poor stability, and difficult maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0074] Figure 1 is a schematic diagram (one) of the variable ratio current transformer test tooling according to an embodiment of the present invention;

[0075] Figure 2 is a schematic diagram (one) of the first output unit according to an embodiment of the present invention;

[0076] Figure 3 is a schematic diagram (one) of the second output unit according to an embodiment of the present invention;

[0077] Figure 4 is a schematic diagram (one) of the third output unit according to an embodiment of the present invention;

[0078] Figure 5 is a schematic diagram (one) of the fourth output unit according to an embodiment of the present invention;

[0079] Figure 6 is a schematic diagram (two) of the variable ratio current transformer test tooling according to an embodiment of the present invention;

[0080] Figure 7 is a schematic diagram (three) of the variable ratio current transformer test tooling according to an embodiment of the present invention;

[0081] Figure 8 is a schematic diagram of the lead-out unit according to an embodiment of the present invention;

[0082] Figure 9 is a schematic diagram of a specific implementation manner of the variable ratio current transformer test tooling according to an embodiment of the present invention.

[0083] The accompanying reference numerals are as follows: 100, the first output unit; 110, the first contact element; 111, the first contactor; 112, the first output terminal; 113, the second output terminal; 114, the third output terminal; 115, the first input terminal; 116, the second input terminal; 117, the third input terminal;

[0084] 200, the second output unit; 210, the second contact element; 211, the second contactor; 212, the fourth output terminal; 213, the fifth output terminal; 214, the sixth output terminal; 215, the fourth input terminal; 216, the fifth input terminal; 217, the sixth input terminal;

[0085] 300, the third output unit; 310, the third contact element; 311, the third contactor; 312, the seventh output terminal; 313, the eighth output terminal; 314, the ninth output terminal; 315, the seventh input terminal; 316, the eighth input terminal; 317, the ninth input terminal;

[0086] 400, the fourth output unit; 410, the fourth contact element; 411, the fourth contactor; 412, the tenth output terminal; 413, the eleventh output terminal; 414, the twelfth output terminal; 415, the tenth input terminal; 416, the eleventh input terminal; 417, the twelfth input terminal;

[0087] 500, the lead-out unit; 510, the first lead-out element; 520, the second lead-out element; 530, the third lead-out element; 540, the fourth lead-out element; 550, the fifth lead-out element; 560, the sixth lead-out element. Detailed implementation manners

[0088] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described and explained below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present application without creative efforts shall fall within the scope of protection of the present application.

[0089] Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. In addition, it can also be understood that although the efforts made in such a development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacturing, or production changes based on the technical content disclosed in the present application are only conventional technical means and should not be understood as the content disclosed in the present application being insufficient.

[0090] Reference to "embodiment" in the present application means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present application can be combined with other embodiments without conflict.

[0091] Unless otherwise defined, the technical terms or scientific terms involved in the present application should have the ordinary meaning understood by those of ordinary skill in the technical field to which the present application pertains. The words such as "a", "an", "one kind", "the" and the like involved in the present application do not indicate a quantity limitation and can represent a singular or plural number. The terms "include", "comprise", "have" and any variations thereof involved in the present application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or units, but may further include unlisted steps or units, or may further include other steps or units inherent to these processes, methods, products or devices. The terms "connect", "be connected", "couple" and the like involved in the present application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" involved in the present application means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, "A and / or B" may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The terms "first", "second", "third", etc. involved in the present application are only used to distinguish similar objects and do not represent a specific order for the objects.

[0092] Embodiment 1

[0093] A schematic embodiment of the present utility model is as Figure 1As shown in the figure, a variable ratio current transformer test tooling is provided in a test area and is used to perform inter-turn overvoltage, FS / ALF, and error tests on the secondary winding of the transformer. The secondary winding of the transformer includes at least 3 terminals, and it includes a first output unit 100, at least one second output unit 200, a third output unit 300, and at least one fourth output unit 400. Among them, the first output unit 100 includes at least 3 first-type terminals and at least 3 second-type terminals. At least 1 second-type terminal of the first output unit 100 is connected to the starting terminal of at least 1 secondary winding of the transformer; the second output unit 200 includes at least 3 first-type terminals and at least 3 second-type terminals. The first-type terminals of the second output unit 200 are connected in series with the first-type terminals of the first output unit 100 to form a common terminal. At least 1 second-type terminal of the second output unit 200 is connected to the middle terminal of at least 1 secondary winding of the transformer. Among them, the number of the first-type terminals of the second output unit 200 is equal to the number of the first-type terminals of the first output unit 100; the third output unit 300 includes at least 3 first-type terminals and at least 3 second-type terminals. At least 1 second-type terminal of the third output unit 300 is connected to the ending terminal of at least 1 secondary winding of the transformer. Among them, the number of the second-type terminals of the third output unit 300 is equal to the number of the second-type terminals of the first output unit 100; the fourth output unit 400 includes at least 3 first-type terminals and at least 3 second-type terminals. The first-type terminals of the fourth output unit 400 are respectively connected in series with the first-type terminals of the third output unit 300 one by one. The second-type terminals of the fourth output unit 400 are respectively connected in parallel with the second-type terminals of the second output unit 200 one by one. At least 1 second-type terminal of the fourth output unit 400 is connected to the middle terminal of at least 1 secondary winding of the transformer. Among them, the number of the first-type terminals of the fourth output unit 400 is equal to the number of the first-type terminals of the third output unit 300, and the number of the second-type terminals of the fourth output unit 400 is equal to the number of the second-type terminals of the second output unit 200.

[0094] In the utility model, the secondary winding of the transformer includes 1 starting terminal, at least 1 middle terminal, and 1 ending terminal.

[0095] In some of these embodiments, there are several second output units 200. The first-type terminals of the several second output units 200 are connected in series with the first-type terminals of the first output unit 100 to form a common terminal. The second-type terminals of the several second output units 200 are respectively connected in parallel with the corresponding second-type terminals of the fourth output unit 400 one by one. At least 1 second-type terminal of each second output unit 200 is connected to the middle terminal of at least 1 secondary winding of the transformer.

[0096] The number of the second output units 200 matches the number of the intermediate terminals of the secondary windings of the current transformers. Generally, the number of the second output units 200 is equal to the number of the intermediate terminals.

[0097] In some of the embodiments, there are a plurality of fourth output units 400. The first type of terminals of the plurality of fourth output units 400 are respectively connected in series with the first type of terminals of the third output unit 300 in one-to-one correspondence. The second type of terminals of the plurality of fourth output units 400 are respectively connected in parallel with the second type of terminals of the corresponding second output units 200 in one-to-one correspondence. At least one second type of terminal of each fourth output unit 400 is connected to at least one intermediate terminal of the secondary windings of the current transformers.

[0098] The number of the fourth output units 400 matches the number of the intermediate terminals of the secondary windings of the current transformers. Generally, the number of the fourth output units 400 is equal to the number of the intermediate terminals.

[0099] The number of the fourth output units 400 matches the number of the second output units 200. Generally, the number of the fourth output units 400 is equal to the number of the second output units 200.

[0100] In the present utility model, the multi-ratio current transformer test tooling can be connected to a plurality of secondary windings of the current transformers simultaneously. Generally, the maximum number of the connected secondary windings of the current transformers depends on the number of the second type of terminals of the first output unit 100.

[0101] As Figure 2 shown, the first output unit 100 includes at least one first contact element 110. Among them, the first contact element 110 includes three first type of terminals and three second type of terminals. The first type of terminals of the first contact element 110 are respectively connected in series with the first type of terminals of the second output units 200. At least one second type of terminal of the first contact element 110 is connected to at least one starting terminal of the secondary windings of the current transformers.

[0102] In some of the embodiments, the first contact element 110 is a contactor, including but not limited to the CJ20-50 contactor.

[0103] Specifically, the first contact element 110 includes a first contactor 111, a first output terminal 112, a second output terminal 113, a third output terminal 114, a first input terminal 115, a second input terminal 116, and a third input terminal 117. Among them, the first output terminal 112 is disposed on the first contactor 111 and is connected in series with the first type of terminal of the second output unit 200; the second output terminal 113 is disposed on the first contactor 111 and is respectively connected in series with the first output terminal 112 and the first type of terminal of the second output unit 200; the third output terminal 114 is disposed on the first contactor 111 and is respectively connected in series with the first output terminal 112, the second output terminal 113, and the first type of terminal of the second output unit 200; the first input terminal 115 is disposed on the first contactor 111 and is connected to the starting terminal of a secondary winding of a current transformer; the second input terminal 116 is disposed on the first contactor 111 and is connected to the starting terminal of a secondary winding of a current transformer; the third input terminal 117 is disposed on the first contactor 111 and is connected to the starting terminal of a secondary winding of a current transformer.

[0104] Among them, the first input terminal 115, the second input terminal 116, and the third input terminal 117 are respectively connected to three different secondary windings of current transformers.

[0105] Among them, the first output terminal 112, the second output terminal 113, and the third output terminal 114 are all of the first type of terminals.

[0106] Among them, the first input terminal 115, the second input terminal 116, and the third input terminal 117 are all of the second type of terminals.

[0107] Generally, the first output terminal 112, the second output terminal 113, and the third output terminal 114 are all located on the same side of the first contactor 111.

[0108] Generally, the first input terminal 115, the second input terminal 116, and the third input terminal 117 are all located on the same side of the first contactor 111.

[0109] Generally, the first output terminal 112, the second output terminal 113, and the third output terminal 114 are located on the first side of the first contactor 111, and the first input terminal 115, the second input terminal 116, and the third input terminal 117 are located on the second side of the first contactor 111. Among them, the first side and the second side are two symmetric sides of the first contactor 111.

[0110] In some of the embodiments, there are several first contact elements 110, and the first type of terminals of the several first contact elements 110 are connected in series.

[0111] Such as Figure 3As shown, the second output unit 200 includes at least one second contact element 210. Among them, the second contact element 210 includes three first-type terminals and three second-type terminals. The first-type terminals of the second contact element 210 are respectively connected in series with the first-type terminals of the first output unit 100. The second-type terminals of the second contact element 210 are connected in parallel with the second-type terminals of the fourth output unit 400 in one-to-one correspondence. At least one second-type terminal of the second contact element 210 is connected to the intermediate terminal of at least one secondary winding of the current transformer.

[0112] In some of these embodiments, the second contact element 210 is a contactor, including but not limited to the CJ20-50 contactor.

[0113] Specifically, the second contact element 210 includes a second contactor 211, a fourth output terminal 212, a fifth output terminal 213, a sixth output terminal 214, a fourth input terminal 215, a fifth input terminal 216, and a sixth input terminal 217. Among them, the fourth output terminal 212 is disposed on the second contactor 211 and is connected in series with the first-type terminals of the first output unit 100. The fifth output terminal 213 is disposed on the second contactor 211 and is respectively connected in series with the fourth output terminal 212 and the first-type terminals of the first output unit 100. The sixth output terminal 214 is disposed on the second contactor 211 and is respectively connected in series with the fourth output terminal 212, the fifth output terminal 213, and the first-type terminals of the first output unit 100. The fourth input terminal 215 is disposed on the second contactor 211, is connected in parallel with the corresponding second-type terminal of the fourth output unit 400, and is connected to the intermediate terminal of one secondary winding of the current transformer. The fifth input terminal 216 is disposed on the second contactor 211, is connected in parallel with the corresponding second-type terminal of the fourth output unit 400, and is connected to the intermediate terminal of one secondary winding of the current transformer. The sixth input terminal 217 is disposed on the second contactor 211, is connected in parallel with the corresponding second-type terminal of the fourth output unit 400, and is connected to the intermediate terminal of one secondary winding of the current transformer.

[0114] Specifically, the fourth output terminal 212, the fifth output terminal 213, and the sixth output terminal 214 are connected in series with the first output terminal 112, the second output terminal 113, and the third output terminal 114.

[0115] Among them, the fourth input terminal 215, the fifth input terminal 216, and the sixth input terminal 217 are respectively connected to three different secondary windings of the current transformer.

[0116] Among them, the fourth output terminal 212, the fifth output terminal 213, and the sixth output terminal 214 are all first-type terminals.

[0117] Among them, the fourth input terminal 215, the fifth input terminal 216, and the sixth input terminal 217 are all second-type terminals.

[0118] Generally, the fourth output terminal 212, the fifth output terminal 213, and the sixth output terminal 214 are all located on the same side of the second contactor 211.

[0119] Generally, the fourth input terminal 215, the fifth input terminal 216, and the sixth input terminal 217 are all located on the same side of the second contactor 211.

[0120] Generally, the fourth output terminal 212, the fifth output terminal 213, and the sixth output terminal 214 are located on the first side of the second contactor 211, and the fourth input terminal 215, the fifth input terminal 216, and the sixth input terminal 217 are located on the second side of the second contactor 211. Among them, the first side and the second side are two symmetric sides of the second contactor 211.

[0121] The number of the second contact elements 210 of each second output unit 200 matches the number of the first contact elements 110. Generally, the number of the second contact elements 210 of each second output unit 200 is equal to the number of the first contact elements 110.

[0122] In some of these embodiments, there are several second contact elements 210, and the first type of terminals of the several second contact elements 210 are connected in series.

[0123] As Figure 4 shown, the third output unit 300 includes at least one third contact element 310. Among them, the third contact element 310 includes 3 first type of terminals and 3 second type of terminals. The first type of terminals of the third contact element 310 are respectively connected in series with the first type of terminals of the fourth output unit 400 one by one, and at least 1 second type of terminal of the third contact element 310 is connected to the end terminal of at least one secondary winding of the current transformer.

[0124] Specifically, the third contact element 310 includes a third contactor 311, a seventh output terminal 312, an eighth output terminal 313, a ninth output terminal 314, a seventh input terminal 315, an eighth input terminal 316, and a ninth input terminal 317. Among them, the seventh output terminal 312 is disposed on the third contactor 311 and is connected in series with the corresponding first type of terminal of the fourth output unit 400; the eighth output terminal 313 is disposed on the third contactor 311 and is connected in series with the corresponding first type of terminal of the fourth output unit 400; the ninth output terminal 314 is disposed on the third contactor 311 and is connected in series with the corresponding first type of terminal of the fourth output unit 400; the seventh input terminal 315 is disposed on the third contactor 311 and is connected to the end terminal of a secondary winding of one current transformer; the eighth input terminal 316 is disposed on the third contactor 311 and is connected to the end terminal of a secondary winding of one current transformer; the ninth input terminal 317 is disposed on the third contactor 311 and is connected to the end terminal of a secondary winding of one current transformer.

[0125] Among them, the seventh input terminal 315, the eighth input terminal 316, and the ninth input terminal 317 are respectively connected to the secondary windings of three different current transformers.

[0126] Among them, the seventh output terminal 312, the eighth output terminal 313, and the ninth output terminal 314 are all of the first type of terminals.

[0127] Among them, the seventh input terminal 315, the eighth input terminal 316, and the ninth input terminal 317 are all of the second type of terminals.

[0128] Generally, the seventh output terminal 312, the eighth output terminal 313, and the ninth output terminal 314 are all located on the same side of the third contactor 311.

[0129] Generally, the seventh input terminal 315, the eighth input terminal 316, and the ninth input terminal 317 are all located on the same side of the third contactor 311.

[0130] Generally, the seventh output terminal 312, the eighth output terminal 313, and the ninth output terminal 314 are located on the first side of the third contactor 311, and the seventh input terminal 315, the eighth input terminal 316, and the ninth input terminal 317 are located on the second side of the third contactor 311. Among them, the first side and the second side are two symmetric sides of the third contactor 311.

[0131] The number of the third contact elements 310 matches the number of the first contact elements 110. Generally, the number of the third contact elements 310 is equal to the number of the first contact elements 110.

[0132] In some of the embodiments, there are a plurality of third contact elements 310, and the plurality of third contact elements 310 are arranged in parallel.

[0133] As shown Figure 5 in FIG., the fourth output unit 400 includes at least one fourth contact element 410. Among them, the fourth contact element 410 includes three first-type terminals and three second-type terminals. The first-type terminals of the fourth contact element 410 are respectively connected in series with the first-type terminals of the third output unit 300 in one-to-one correspondence. The second-type terminals of the fourth contact element 410 are respectively connected in parallel with the second-type terminals of the second output unit 200 in one-to-one correspondence. At least one second-type terminal of the fourth contact element 410 is connected to the middle terminal of at least one secondary winding of the current transformer.

[0134] Specifically, the fourth contact element 410 includes a fourth contactor 411, a tenth output terminal 412, an eleventh output terminal 413, a twelfth output terminal 414, a tenth input terminal 415, an eleventh input terminal 416, and a twelfth input terminal 417. Among them, the tenth output terminal 412 is arranged on the fourth contactor 411 and is connected in series with the corresponding first-type terminal of the third output unit 300; the eleventh output terminal 413 is arranged on the fourth contactor 411 and is connected in series with the corresponding first-type terminal of the third output unit 300; the twelfth output terminal 414 is arranged on the fourth contactor 411 and is connected in series with the corresponding first-type terminal of the third output unit 300; the tenth input terminal 415 is arranged on the fourth contactor 411, is connected in parallel with the corresponding second-type terminal of the second output unit 200, and is connected to the middle terminal of a secondary winding of a current transformer; the eleventh input terminal 416 is arranged on the fourth contactor 411, is connected in parallel with the corresponding second-type terminal of the second output unit 200, and is connected to the middle terminal of a secondary winding of a current transformer; the twelfth input terminal 417 is arranged on the fourth contactor 411, is connected in parallel with the corresponding second-type terminal of the second output unit 200, and is connected to the middle terminal of a secondary winding of a current transformer.

[0135] Specifically, the tenth output terminal 412 is connected in series with the seventh output terminal 312; the eleventh output terminal 413 is connected in series with the eighth output terminal 313; the twelfth output terminal 414 is connected in series with the ninth output terminal 314; the tenth input terminal 415 is connected in parallel with the fourth input terminal 215; the eleventh input terminal 416 is connected in parallel with the fifth input terminal 216; the twelfth input terminal 417 is connected in parallel with the sixth input terminal 217.

[0136] Among them, the tenth input terminal 415, the eleventh input terminal 416, and the twelfth input terminal 417 are respectively connected to three different secondary windings of the current transformer.

[0137] Among them, the tenth output terminal 412, the eleventh output terminal 413, and the twelfth output terminal 414 are all first-type terminals.

[0138] Among them, the tenth input terminal 415, the eleventh input terminal 416, and the twelfth input terminal 417 are all second - type terminals.

[0139] Generally, the tenth output terminal 412, the eleventh output terminal 413, and the twelfth output terminal 414 are all located on the same side of the fourth contactor 411.

[0140] Generally, the tenth input terminal 415, the eleventh input terminal 416, and the twelfth input terminal 417 are all located on the same side of the fourth contactor 411.

[0141] Generally, the tenth output terminal 412, the eleventh output terminal 413, and the twelfth output terminal 414 are located on the first side of the fourth contactor 411, and the tenth input terminal 415, the eleventh input terminal 416, and the twelfth input terminal 417 are located on the second side of the fourth contactor 411. Among them, the first side and the second side are two symmetric sides of the fourth contactor 411.

[0142] The number of the fourth contact elements 410 of each fourth output unit 400 matches the number of the third contact elements 310. Generally, the number of the fourth contact elements 410 of each fourth output unit 400 is equal to the number of the third contact elements 310.

[0143] The number of the fourth contact elements 410 of each fourth output unit 400 matches the number of the second contact elements 210 of each second output unit 200. Generally, the number of the fourth contact elements 410 of each fourth output unit 400 is equal to the number of the second contact elements 210 of each second output unit 200.

[0144] In some of these embodiments, there are several fourth contact elements 410, and several fourth contact elements 410 are arranged in parallel.

[0145] Taking one second output unit 200, one fourth output unit 400, one first contact element 110, one second contact element 210, one third contact element 310, and one fourth contact element 410 as examples for illustration, the usage method of the present utility model is as follows:

[0146] Connect the first output terminal 112, the second output terminal 113, and the third output terminal 114 of the first contact element 110 in series with the fourth output terminal 212, the fifth output terminal 213, and the sixth output terminal 214 of the second contact element 210 to form a common terminal;

[0147] The seventh output terminal 312 of the third contact element 310 and the tenth output terminal 412 of the fourth contact element 410 are connected in series to form the first end. The eighth output terminal 313 of the third contact element 310 and the eleventh output terminal 413 of the fourth contact element 410 are connected in series to form the second end. The ninth output terminal 314 of the third contact element 310 and the twelfth output terminal 414 of the fourth contact element 410 are connected in series to form the third end;

[0148] The fourth input terminal 215 of the second contact element 210 and the tenth input terminal 415 of the fourth contact element 410 are connected in parallel. The fifth input terminal 216 of the second contact element 210 and the eleventh input terminal 416 of the fourth contact element 410 are connected in parallel. The sixth input terminal 217 of the second contact element 210 and the twelfth input terminal 417 of the fourth contact element 410 are connected in parallel;

[0149] The first input terminal 115 of the first contact element 110 is connected to the starting terminal of the secondary winding of the first current transformer. The second input terminal 116 of the first contact element 110 is connected to the starting terminal of the secondary winding of the second current transformer. The third input terminal 117 of the first contact element 110 is connected to the starting terminal of the secondary winding of the third current transformer;

[0150] The seventh input terminal 315 of the third contact element 310 is connected to the ending terminal of the secondary winding of the first current transformer. The eighth input terminal 316 of the third contact element 310 is connected to the ending terminal of the secondary winding of the second current transformer. The ninth input terminal 317 of the third contact element 310 is connected to the ending terminal of the secondary winding of the third current transformer;

[0151] The tenth input terminal 415 of the fourth contact element 410 is connected to the middle terminal of the secondary winding of the first current transformer. The eleventh input terminal 416 of the fourth contact element 410 is connected to the middle terminal of the secondary winding of the second current transformer. The twelfth input terminal 417 of the fourth contact element 410 is connected to the middle terminal of the secondary winding of the third current transformer;

[0152] After powering on the first contact element 110, the second contact element 210, the third contact element 310, and the fourth contact element 410, the inter-turn overvoltage, FS / ALF, and error tests can be performed on the secondary windings of the three current transformers.

[0153] The advantages of the present utility model are as follows: it has a compact design and is convenient to move. When testing the inter-turn overvoltage, FS / ALF, and error of current transformers with multiple turns ratios, only the primary and secondary winding connections need to be made once, avoiding the trouble of changing the wiring multiple times for each turn ratio; it has high efficiency, the tooling works stably and is not easily damaged, the components are standardized and easy to repair, solving the problems of complex traditional operations, poor stability, and difficult maintenance.

[0154] Embodiment 2

[0155] This embodiment is a variant embodiment of Embodiment 1.

[0156] In this embodiment, it is described by taking 2 first contact elements 110, 2 second contact elements 210, 2 third contact elements 310, and 2 fourth contact elements 410 as examples.

[0157] As Figure 6 shown, the usage method of the present utility model is as follows:

[0158] Connect the first type of terminals (first output terminal 112, second output terminal 113, third output terminal 114) of the first first contact element 110, the first type of terminals (first output terminal 112, second output terminal 113, third output terminal 114) of the second first contact element 110, the first type of terminals (fourth output terminal 212, fifth output terminal 213, sixth output terminal 214) of the first second contact element 210, and the first type of terminals (fourth output terminal 212, fifth output terminal 213, sixth output terminal 214) of the second second contact element 210 in series to form a common terminal;

[0159] Connect the seventh output terminal 312 of the first third contact element 310 and the tenth output terminal 412 of the first fourth contact element 410 in series to form the first end, connect the eighth output terminal 313 of the first third contact element 310 and the eleventh output terminal 413 of the first fourth contact element 410 in series to form the second end, connect the ninth output terminal 314 of the first third contact element 310 and the twelfth output terminal 414 of the first fourth contact element 410 in series to form the third end, connect the seventh output terminal 312 of the second third contact element 310 and the tenth output terminal 412 of the second fourth contact element 410 in series to form the fourth end, connect the eighth output terminal 313 of the second third contact element 310 and the eleventh output terminal 413 of the second fourth contact element 410 in series to form the fifth end, and connect the ninth output terminal 314 of the second third contact element 310 and the twelfth output terminal 414 of the second fourth contact element 410 in series to form the sixth end;

[0160] The fourth input terminal 215 of the first second contact element 210 is connected in parallel with the tenth input terminal 415 of the first fourth contact element 410, the fifth input terminal 216 of the first second contact element 210 is connected in parallel with the eleventh input terminal 416 of the first fourth contact element 410, the sixth input terminal 217 of the first second contact element 210 is connected in parallel with the twelfth input terminal 417 of the first fourth contact element 410, the fourth input terminal 215 of the second second contact element 210 is connected in parallel with the tenth input terminal 415 of the second fourth contact element 410, the fifth input terminal 216 of the second second contact element 210 is connected in parallel with the eleventh input terminal 416 of the second fourth contact element 410, and the sixth input terminal 217 of the second second contact element 210 is connected in parallel with the twelfth input terminal 417 of the second fourth contact element 410;

[0161] Connect the first input terminal 115 of the first first contact element 110 to the starting terminal of the secondary winding of the first transformer, connect the second input terminal 116 of the first first contact element 110 to the starting terminal of the secondary winding of the second transformer, connect the third input terminal 117 of the first first contact element 110 to the starting terminal of the secondary winding of the third transformer, connect the first input terminal 115 of the second first contact element 110 to the starting terminal of the secondary winding of the fourth transformer, connect the second input terminal 116 of the second first contact element 110 to the starting terminal of the secondary winding of the fifth transformer, and connect the third input terminal 117 of the second first contact element 110 to the starting terminal of the secondary winding of the sixth transformer;

[0162] Connect the seventh input terminal 315 of the first third contact element 310 to the end terminal of the secondary winding of the first transformer, connect the eighth input terminal 316 of the first third contact element 310 to the end terminal of the secondary winding of the second transformer, connect the ninth input terminal 317 of the first third contact element 310 to the end terminal of the secondary winding of the third transformer, connect the seventh input terminal 315 of the second third contact element 310 to the end terminal of the secondary winding of the fourth transformer, connect the eighth input terminal 316 of the second third contact element 310 to the end terminal of the secondary winding of the fifth transformer, and connect the ninth input terminal 317 of the second third contact element 310 to the end terminal of the secondary winding of the sixth transformer;

[0163] Connect the tenth input terminal 415 of the first fourth contact element 410 to the middle terminal of the secondary winding of the first current transformer, connect the eleventh input terminal 416 of the first fourth contact element 410 to the middle terminal of the secondary winding of the second current transformer, connect the twelfth input terminal 417 of the first fourth contact element 410 to the middle terminal of the secondary winding of the third current transformer, connect the tenth input terminal 415 of the second fourth contact element 410 to the middle terminal of the secondary winding of the fourth current transformer, connect the eleventh input terminal 416 of the second fourth contact element 410 to the middle terminal of the secondary winding of the fifth current transformer, and connect the twelfth input terminal 417 of the second fourth contact element 410 to the middle terminal of the secondary winding of the sixth current transformer;

[0164] After powering on the first contact element 110, the second contact element 210, the third contact element 310, and the fourth contact element 410, the turn-to-turn overvoltage, FS / ALF, and error tests can be performed on the secondary windings of the six current transformers.

[0165] The technical effects of this embodiment are basically the same as those of Embodiment 1 and will not be elaborated here.

[0166] Embodiment 3

[0167] This embodiment is a variant embodiment of Embodiment 2.

[0168] In this embodiment, an example is given where the second output unit 200 has 3 and the fourth output unit 400 has 3.

[0169] In this embodiment, there are 2 first contact elements 110, named the first contact element A and the first contact element B respectively.

[0170] In this embodiment, there are 6 second contact elements 210, named the second contact element A, the second contact element B, the second contact element C, the second contact element D, the second contact element E, and the second contact element F respectively.

[0171] In this embodiment, there are 2 third contact elements 310, named the third contact element A and the third contact element B respectively.

[0172] In this embodiment, there are 6 fourth contact elements 410, named the fourth contact element A, the fourth contact element B, the fourth contact element C, the fourth contact element D, the fourth contact element E, and the fourth contact element F respectively.

[0173] As Figure 7 shown, the usage method of the present utility model is as follows:

[0174] Connect the first type of terminals of the first contact element A (the first output terminal 112, the second output terminal 113, the third output terminal 114), the first type of terminals of the first contact element B (the first output terminal 112, the second output terminal 113, the third output terminal 114), the first type of terminals of the second contact element A (the fourth output terminal 212, the fifth output terminal 213, the sixth output terminal 214), the first type of terminals of the second contact element B (the fourth output terminal 212, the fifth output terminal 213, the sixth output terminal 214), the first type of terminals of the second contact element C (the fourth output terminal 212, the fifth output terminal 213, the sixth output terminal 214), the first type of terminals of the second contact element D (the fourth output terminal 212, the fifth output terminal 213, the sixth output terminal 214), the first type of terminals of the second contact element E (the fourth output terminal 212, the fifth output terminal 213, the sixth output terminal 214), the first type of terminals of the second contact element F (the fourth output terminal 212, the fifth output terminal 213, the sixth output terminal 214) in series to form a common terminal;

[0175] Connect the seventh output terminal 312 of the third contact element A, the tenth output terminal 412 of the fourth contact element A, the tenth output terminal 412 of the fourth contact element C, the tenth output terminal 412 of the fourth contact element E in series to form a first end, connect the eighth output terminal 313 of the third contact element A, the eleventh output terminal 413 of the fourth contact element A, the eleventh output terminal 413 of the fourth contact element C, the eleventh output terminal 413 of the fourth contact element E in series to form a second end, connect the ninth output terminal 314 of the third contact element A, the twelfth output terminal 414 of the fourth contact element A, the twelfth output terminal 414 of the fourth contact element C, the twelfth output terminal 414 of the fourth contact element E in series to form a third end, connect the seventh output terminal 312 of the third contact element B, the tenth output terminal 412 of the fourth contact element D, the tenth output terminal 412 of the fourth contact element F in series to form a fourth end, connect the eighth output terminal 313 of the third contact element B, the eleventh output terminal 413 of the fourth contact element B, the eleventh output terminal 413 of the fourth contact element D, the eleventh output terminal 413 of the fourth contact element F in series to form a fifth end, connect the ninth output terminal 314 of the third contact element B, the twelfth output terminal 414 of the fourth contact element B, the twelfth output terminal 414 of the fourth contact element D, the twelfth output terminal 414 of the fourth contact element F in series to form a sixth end;

[0176] The fourth input terminal 215 of the second contact element A is connected in parallel with the tenth input terminal 415 of the fourth contact element A, the fifth input terminal 216 of the second contact element A is connected in parallel with the eleventh input terminal 416 of the fourth contact element A, the sixth input terminal 217 of the second contact element A is connected in parallel with the twelfth input terminal 417 of the fourth contact element A, the fourth input terminal 215 of the second contact element B is connected in parallel with the tenth input terminal 415 of the fourth contact element B, the fifth input terminal 216 of the second contact element B is connected in parallel with the eleventh input terminal 416 of the fourth contact element B, the sixth input terminal 217 of the second contact element B is connected in parallel with the twelfth input terminal 417 of the fourth contact element B, the fourth input terminal 215 of the second contact element C is connected in parallel with the tenth input terminal 415 of the fourth contact element C, the fifth input terminal 216 of the second contact element C is connected in parallel with the eleventh input terminal 416 of the fourth contact element C, the sixth input terminal 217 of the second contact element C is connected in parallel with the twelfth input terminal 417 of the fourth contact element C, the fourth input terminal 215 of the second contact element D is connected in parallel with the tenth input terminal 415 of the fourth contact element D, the fifth input terminal 216 of the second contact element D is connected in parallel with the eleventh input terminal 416 of the fourth contact element D, the sixth input terminal 217 of the second contact element D is connected in parallel with the twelfth input terminal 417 of the fourth contact element D, the fourth input terminal 215 of the second contact element E is connected in parallel with the tenth input terminal 415 of the fourth contact element E, the fifth input terminal 216 of the second contact element E is connected in parallel with the eleventh input terminal 416 of the fourth contact element E, the sixth input terminal 217 of the second contact element E is connected in parallel with the twelfth input terminal 417 of the fourth contact element E, the fourth input terminal 215 of the second contact element F is connected in parallel with the tenth input terminal 415 of the fourth contact element F, the fifth input terminal 216 of the second contact element F is connected in parallel with the eleventh input terminal 416 of the fourth contact element F, the sixth input terminal 217 of the second contact element F is connected in parallel with the twelfth input terminal 417 of the fourth contact element F;

[0177] The first input terminal 115 of the first contact element A is connected to the starting terminal of the first transformer secondary winding, the second input terminal 116 of the first contact element A is connected to the starting terminal of the second transformer secondary winding, the third input terminal 117 of the first contact element A is connected to the starting terminal of the third transformer secondary winding, the first input terminal 115 of the first contact element B is connected to the starting terminal of the fourth transformer secondary winding, the second input terminal 116 of the first contact element B is connected to the starting terminal of the fifth transformer secondary winding, the third input terminal 117 of the first contact element B is connected to the starting terminal of the sixth transformer secondary winding;

[0178] Connect the seventh input terminal 315 of the third contact element A to the end terminal of the secondary winding of the first current transformer, connect the eighth input terminal 316 of the third contact element A to the end terminal of the secondary winding of the second current transformer, connect the ninth input terminal 317 of the third contact element A to the end terminal of the secondary winding of the third current transformer, connect the seventh input terminal 315 of the third contact element B to the end terminal of the secondary winding of the fourth current transformer, connect the eighth input terminal 316 of the third contact element B to the end terminal of the secondary winding of the fifth current transformer, and connect the ninth input terminal 317 of the third contact element B to the end terminal of the secondary winding of the sixth current transformer;

[0179] Connect the tenth input terminal 415 of the fourth contact element A to the first intermediate terminal of the secondary winding of the first current transformer, connect the eleventh input terminal 416 of the fourth contact element A to the first intermediate terminal of the secondary winding of the second current transformer, connect the twelfth input terminal 417 of the fourth contact element A to the first intermediate terminal of the secondary winding of the third current transformer, connect the tenth input terminal 415 of the fourth contact element B to the first intermediate terminal of the secondary winding of the fourth current transformer, connect the eleventh input terminal 416 of the fourth contact element B to the first intermediate terminal of the secondary winding of the fifth current transformer, and connect the twelfth input terminal 417 of the fourth contact element B to the first intermediate terminal of the secondary winding of the sixth current transformer;

[0180] Connect the tenth input terminal 415 of the fourth contact element C to the second intermediate terminal of the secondary winding of the first current transformer, connect the eleventh input terminal 416 of the fourth contact element C to the second intermediate terminal of the secondary winding of the second current transformer, connect the twelfth input terminal 417 of the fourth contact element C to the second intermediate terminal of the secondary winding of the third current transformer, connect the tenth input terminal 415 of the fourth contact element D to the second intermediate terminal of the secondary winding of the fourth current transformer, connect the eleventh input terminal 416 of the fourth contact element D to the second intermediate terminal of the secondary winding of the fifth current transformer, and connect the twelfth input terminal 417 of the fourth contact element D to the second intermediate terminal of the secondary winding of the sixth current transformer;

[0181] Connect the tenth input terminal 415 of the fourth contact element E to the third intermediate terminal of the secondary winding of the first current transformer, connect the eleventh input terminal 416 of the fourth contact element E to the third intermediate terminal of the secondary winding of the second current transformer, connect the twelfth input terminal 417 of the fourth contact element E to the third intermediate terminal of the secondary winding of the third current transformer, connect the tenth input terminal 415 of the fourth contact element F to the third intermediate terminal of the secondary winding of the fourth current transformer, connect the eleventh input terminal 416 of the fourth contact element F to the third intermediate terminal of the secondary winding of the fifth current transformer, and connect the twelfth input terminal 417 of the fourth contact element F to the third intermediate terminal of the secondary winding of the sixth current transformer;

[0182] After powering on the first contact element A, the first contact element B, the second contact element A, the second contact element B, the second contact element C, the second contact element D, the second contact element E, the second contact element F, the third contact element A, the third contact element B, the fourth contact element A, the fourth contact element B, the fourth contact element C, the fourth contact element D, the fourth contact element E, and the fourth contact element R, the inter-turn overvoltage, FS / ALF, and error tests can be performed on the secondary windings of the six current transformers.

[0183] The technical effect of this embodiment is basically the same as that of Embodiment 2 and will not be elaborated here.

[0184] Embodiment 4

[0185] This embodiment is a variant embodiment of Embodiments 1 to 3.

[0186] As Figure 8 shown, the multi-ratio current transformer test tooling further includes a lead-out unit 500. Among them, the lead-out unit 500 is respectively connected to the first output unit 100, at least one second output unit 200, the third output unit 300, at least one fourth output unit 400, and at least one secondary winding of the current transformer.

[0187] The lead-out unit 500 includes a first lead-out element 510, at least three second lead-out elements 520, at least three third lead-out elements 530, at least three fourth lead-out elements 540, at least three fifth lead-out elements 550, and at least three sixth lead-out elements 560. Among them, the first lead-out element 510 is respectively connected to the first-type terminals of the first output unit 100 and the first-type terminals of at least one second output unit 200; the second lead-out elements 520 are respectively connected to the second-type terminals of the first output unit 100 in one-to-one correspondence; the third lead-out elements 530 are respectively connected to the second-type terminals of the second output unit 200 and the second-type terminals of the fourth output unit 400 in one-to-one correspondence; the fourth lead-out elements 540 are respectively connected to the first-type terminals of the third output unit 300 and the first-type terminals of the fourth output unit 400 in one-to-one correspondence; the fifth lead-out elements 550 are respectively connected to the second-type terminals of the third output unit 300 in one-to-one correspondence; the sixth lead-out elements 560 are respectively connected to the second-type terminals of the fourth output unit 400 in one-to-one correspondence.

[0188] Specifically, the first lead-out element 510 is respectively connected to the first-type terminals of the first contact element 110 and the first-type terminals of the second contact element 210; several second lead-out elements 520 are respectively connected to the second-type terminals of the first contact element 110 in one-to-one correspondence; several third lead-out elements 530 are respectively connected to the second-type terminals of the second contact element 210 and the second-type terminals of the fourth contact element 410 in one-to-one correspondence; several fourth lead-out elements 540 are respectively connected to the first-type terminals of the third contact element 310 and the first-type terminals of the fourth contact element 410 in one-to-one correspondence; several fifth lead-out elements 550 are respectively connected to the second-type terminals of the third contact element 310 in one-to-one correspondence; several sixth lead-out elements 560 are respectively connected to the second-type terminals of the fourth contact element 410 in one-to-one correspondence.

[0189] More specifically, the first lead-out component 510 is respectively connected to the first output terminal 112, the second output terminal 113, the third output terminal 114, the fourth output terminal 212, the fifth output terminal 213, and the sixth output terminal 214; a plurality of second lead-out components 520 are respectively connected to the first input terminal 115, the second input terminal 116, and the third input terminal 117 in one-to-one correspondence; a plurality of third lead-out components 530 are respectively connected to the fourth input terminal 215, the fifth input terminal 216, the sixth input terminal 217, the tenth input terminal 415, the eleventh input terminal 416, and the twelfth input terminal 417 in one-to-one correspondence; a plurality of fourth lead-out components 540 are respectively connected to the seventh output terminal 312, the eighth output terminal 313, the ninth output terminal 314, the tenth output terminal 412, the eleventh output terminal 413, and the twelfth output terminal 414 in one-to-one correspondence; a plurality of fifth lead-out components 550 are respectively connected to the seventh input terminal 315, the eighth input terminal 316, and the ninth input terminal 317 in one-to-one correspondence; a plurality of sixth lead-out components 560 are respectively connected to the tenth input terminal 415, the eleventh input terminal 416, and the twelfth input terminal 417 in one-to-one correspondence.

[0190] In some of these embodiments, the first lead-out component 510 is a multi-core flexible cable.

[0191] The number of the second lead-out components 520 matches the number of the second-type terminals of the first output unit 100. Generally, the number of the second lead-out components 520 is equal to the number of the second-type terminals of the first output unit 100. Specifically, the number of the second lead-out components 520 = the number of the first contact components 110 * 3. Among them, 3 refers to the sum of the first input terminal 115, the second input terminal 116, and the third input terminal 117 of a single first contact component 110.

[0192] In some of these embodiments, the second lead-out component 520 is a multi-core flexible cable.

[0193] The number of the third lead-out components 530 matches the number of the second-type terminals of the second output unit 200. Generally, the number of the third lead-out components 530 is equal to the number of the second-type terminals of the second output unit 200. Specifically, the number of the third lead-out components 530 = the number of the second output units 200 * the number of the second contact components 210 * 3. Among them, 3 refers to the sum of the fourth input terminal 215, the fifth input terminal 216, and the sixth input terminal 217 of a single second contact component 210.

[0194] In some of these embodiments, the third lead-out component 530 is a multi-core flexible cable.

[0195] The number of the fourth lead-out element 540 matches the number of the first type of terminals of the third output unit 300. Generally, the number of the fourth lead-out element 540 is equal to the number of the first type of terminals of the third output unit 300. Specifically, the number of the fourth lead-out element 540 = the number of the third contact elements 310 * 3. Wherein, 3 refers to the sum of the seventh output terminal 312, the eighth output terminal 313, and the ninth output terminal 314 of a single third contact element 310.

[0196] In some of these embodiments, the fourth lead-out element 540 is a multi-core flexible cable.

[0197] The number of the fifth lead-out element 550 matches the number of the second type of terminals of the third output unit 300. Generally, the number of the fifth lead-out element 550 is equal to the number of the second type of terminals of the third output unit 300. Generally, the number of the fifth lead-out element 550 = the number of the third contact elements 310 * 3. Wherein, 3 refers to the sum of the seventh input terminal 315, the eighth input terminal 316, and the ninth input terminal 317 of a single third contact element 310.

[0198] In some of these embodiments, the fifth lead-out element 550 is a multi-core flexible cable.

[0199] The number of the sixth lead-out element 560 matches the second type of terminals of the fourth output unit 400. Generally, the number of the sixth lead-out element 560 is equal to the number of the second type of terminals of the fourth output unit 400. Specifically, the number of the sixth lead-out element 560 = the number of the fourth output units 400 * the number of the fourth contact elements 410 * 3. Wherein, 3 refers to the sum of the tenth input terminal 415, the eleventh input terminal 416, and the twelfth input terminal 417 of a single fourth contact element 410.

[0200] In some of these embodiments, the sixth lead-out element 560 is a multi-core flexible cable.

[0201] Furthermore, the variable ratio current transformer test tooling further includes a clamping unit. Wherein, the clamping unit is arranged at the end of the lead-out unit 500.

[0202] Generally, the clamping unit is arranged at least at the ends of the second lead-out element 520, the fifth lead-out element 550, and the sixth lead-out element 560.

[0203] The number of the clamping units matches the number of the second lead-out element 520, the number of the fifth lead-out element 550, and the number of the sixth lead-out element 560. Generally, the number of the clamping units = the number of the second lead-out element 520 + the number of the fifth lead-out element 550 + the number of the sixth lead-out element 560.

[0204] In some of these embodiments, the clamping unit includes, but is not limited to, battery clips.

[0205] Embodiment 5

[0206] This embodiment is a variant embodiment of Embodiments 1 to 4.

[0207] Furthermore, the multi-ratio current transformer test tooling further includes a cable unit. Among them, the cable unit is respectively connected to the first output unit 100, at least one second output unit 200, the third output unit 300, at least one fourth output unit 400, and the working power supply.

[0208] Specifically, the cable unit is respectively connected to the first contact element 110, the second contact element 210, the third contact element 310, the fourth contact element 410, and the working power supply.

[0209] In some of these embodiments, the cable unit is a multi-core flexible cable. Specifically, taking the cable unit as an n-core wire as an example for illustration. Among them, the n# wire of the cable unit serially connects the first contact element 110, the second contact element 210, the third contact element 310, and the fourth contact element 410 to the working power supply; the 1# - n - 1# wires of the cable unit are connected to the control power supply; the 1# - m# wires at the first end of the cable unit are respectively connected to the first contact element 110 and at least one second contact element 210, and the 1# - m# wires at the second end of the cable unit are connected to the switch; the m + 1# - n - 1# wires at the first end of the cable unit are respectively connected to the third contact element 310 and at least one fourth contact element 410, and the m + 1# - n - 1# wires at the second end of the cable unit are connected to the switch. Among them, m = the number of the first output unit 100 + the number of the second output unit 200.

[0210] Taking the second output unit 200 as 3 and the fourth output unit 400 as 3 as an example for illustration. Among them, the 9# wire of the cable unit serially connects the first contact element 110, the second contact element 210, the third contact element 310, and the fourth contact element 410 to the working power supply; the 1# - 8# wires of the cable unit are connected to the control power supply; the 1# - 4# wires at the first end of the cable unit are respectively connected to the first contact element 110 and at least one second contact element 210, and the 1# - 4# wires at the second end of the cable unit are connected to the switch; the 4# - 8# wires at the first end of the cable unit are respectively connected to the third contact element 310 and at least one fourth contact element 410, and the 4# - 8# wires at the second end of the cable unit are connected to the switch.

[0211] In some of these embodiments, the multi-core flexible cable is a flexible cable that complies with the GB / T 8734.3 standard.

[0212] Furthermore, the multi-ratio current transformer test tooling further includes a first switch unit and a second switch unit. Among them, the first switch unit is respectively connected to the first output unit 100, at least one second output unit 200, and the cable unit; the second switch unit is respectively connected to the third output unit 300, at least one fourth output unit 400, and the cable unit.

[0213] Specifically, the first switch unit is respectively connected to the first contact element 110 and the second contact element 210; the second switch unit is respectively connected to the third contact element 310 and the fourth contact element 410.

[0214] More specifically, the first switch unit is connected to the 1#-m# wires at the second end of the cable unit; the second switch unit is connected to the m+1#-n-1# wires at the second end of the cable unit.

[0215] In some of the embodiments, the first switch unit is a universal multi-control switch. That is, the first switch unit can separately control the first output unit 100 and the second output unit 200 connected thereto. Among them, the control quantity of the first switch unit = the quantity of the first output unit 100 + the quantity of the second output unit 200.

[0216] Taking the second output unit 200 as an example of 3, the first switch unit can be a universal four-control switch.

[0217] In some of the embodiments, the second switch unit is a universal multi-control switch. That is, the second switch unit can separately control the third output unit 300 and the fourth output unit 400 connected thereto. Among them, the control quantity of the second switch unit = the quantity of the third output unit 300 + the quantity of the fourth output unit 400.

[0218] Taking the fourth output unit 400 as an example of 3, the second switch unit can be a universal four-control switch.

[0219] Embodiment 6

[0220] This embodiment is a specific implementation manner of the present utility model.

[0221] As Figure 9 shown, a multi-ratio current transformer inter-turn overvoltage, FS / ALF, error test tooling is disposed in the test area, and includes 16 CJ20-50 contactors, a multi-core flexible cable, 2 universal four-control switches, 30 lead wires, and 30 battery clips.

[0222] In this embodiment, the multi-ratio current transformer inter-turn overvoltage, FS / ALF, error test tooling can connect up to six secondary windings at the same time, and each winding can test the inter-turn overvoltage of ten ratios, the FS / ALF of ten ratios, and the error of ten ratios.

[0223] The four switches of the first universal four-control switch are respectively marked as Switch 1, Switch 2, Switch 3, and Switch 4; the four switches of the second universal four-control switch are respectively marked as Switch 5, Switch 6, Switch 7, and Switch 8.

[0224] The 16 CJ20-50 contactors are divided into 8 groups of contactors, and each group of contactors includes 2 CJ20-50 contactors, which are respectively:

[0225] Starting group: The first starting group (1-1CJ1 and 1-1CJ2), the second starting group (1-2CJ1 and 1-2CJ2), the third starting group (1-3CJ1 and 1-3CJ2), the fourth starting group (1-4CJ1 and 1-4CJ2);

[0226] Ending group: The first ending group (2-1CJ1 and 2-1CJ2), the second ending group (2-2CJ1 and 2-2CJ2), the third ending group (2-3CJ1 and 2-3CJ2), the fourth ending group (2-4CJ1 and 2-4CJ2).

[0227] For CJ1 of each group of contactors, its 6 terminals are respectively marked as Terminal A, Terminal B, Terminal C, Terminal 1S, Terminal 2S, and Terminal 3S; for CJ2 of each group of contactors, its 6 terminals are respectively marked as Terminal D, Terminal E, Terminal F, Terminal 4S, Terminal 5S, and Terminal 6S.

[0228] Use the 9# of the multi-core flexible cable to connect the 8 groups of contactors A2 in series to the working power supply, and the 1#-8# wires of the multi-core flexible cable are connected to A1 as the control power supply.

[0229] The 1#-4# wires at the first end of the multi-core flexible cable are respectively connected to the first starting group, the second starting group, the third starting group, and the fourth starting group, and the 1#-4# wires at the other end of the multi-core flexible cable are respectively connected to the 1-4 switches of the first universal four-control switch.

[0230] The 5#-8# wires at the first end of the multi-core flexible cable are respectively connected to the first ending group, the second ending group, the third ending group, and the fourth ending group, and the 5#-8# wires at the other end of the multi-core flexible cable are respectively connected to the 5-8 switches of the second universal four-control switch.

[0231] Connect the Terminal A, Terminal B, Terminal C, Terminal D, Terminal E, and Terminal F of the first starting group, the second starting group, the third starting group, and the fourth starting group in series as the common terminal to connect the lead wire.

[0232] Connect the 1S2 terminal, 2S2 terminal, 3S2 terminal, 4S2 terminal, 5S2 terminal, and 6S2 terminal of the second group at the beginning to the 1S2 terminal, 2S2 terminal, 3S2 terminal, 4S2 terminal, 5S2 terminal, and 6S2 terminal of the first group at the end in one-to-one correspondence and in parallel (i.e., the 1S2 terminal is connected in parallel with the 1S2 terminal, the 2S2 terminal is connected in parallel with the 2S2 terminal, the 3S2 terminal is connected in parallel with the 3S2 terminal, the 4S2 terminal is connected in parallel with the 4S2 terminal, the 5S2 terminal is connected in parallel with the 5S2 terminal, and the 6S2 terminal is connected in parallel with the 6S2 terminal); connect the 1S3 terminal, 2S3 terminal, 3S3 terminal, 4S3 terminal, 5S3 terminal, and 6S3 terminal of the third group at the beginning to the 1S3 terminal, 2S3 terminal, 3S3 terminal, 4S3 terminal, 5S3 terminal, and 6S3 terminal of the second group at the end in one-to-one correspondence and in parallel (i.e., the 1S3 terminal is connected in parallel with the 1S3 terminal, the 2S3 terminal is connected in parallel with the 2S3 terminal, the 3S3 terminal is connected in parallel with the 3S3 terminal, the 4S3 terminal is connected in parallel with the 4S3 terminal, the 5S3 terminal is connected in parallel with the 5S3 terminal, and the 6S3 terminal is connected in parallel with the 6S3 terminal); connect the 1S4 terminal, 2S4 terminal, 3S4 terminal, 4S4 terminal, 5S4 terminal, and 6S4 terminal of the fourth group at the beginning to the 1S4 terminal, 2S4 terminal, 3S4 terminal, 4S4 terminal, 5S4 terminal, and 6S4 terminal of the third group at the end in one-to-one correspondence and in parallel (i.e., the 1S4 terminal is connected in parallel with the 1S4 terminal, the 2S4 terminal is connected in parallel with the 2S4 terminal, the 3S4 terminal is connected in parallel with the 3S4 terminal, the 4S4 terminal is connected in parallel with the 4S4 terminal, the 5S4 terminal is connected in parallel with the 5S4 terminal, and the 6S4 terminal is connected in parallel with the 6S4 terminal).

[0233] Connect the A terminals of the first group at the end, the A terminals of the second group at the end, the A terminals of the third group at the end, and the A terminals of the fourth group at the end in series as the lead-out wire for the connection at the end of the first group; connect the B terminals of the first group at the end, the B terminals of the second group at the end, the B terminals of the third group at the end, and the B terminals of the fourth group at the end in series as the lead-out wire for the connection at the end of the second group; connect the C terminals of the first group at the end, the C terminals of the second group at the end, the C terminals of the third group at the end, and the C terminals of the fourth group at the end in series as the lead-out wire for the connection at the end of the third group; connect the D terminals of the first group at the end, the D terminals of the second group at the end, the D terminals of the third group at the end, and the D terminals of the fourth group at the end in series as the lead-out wire for the connection at the end of the fourth group; connect the E terminals of the first group at the end, the E terminals of the second group at the end, the E terminals of the third group at the end, and the E terminals of the fourth group at the end in series as the lead-out wire for the connection at the end of the fifth group; connect the F terminals of the first group at the end, the F terminals of the second group at the end, the F terminals of the third group at the end, and the F terminals of the fourth group at the end in series as the lead-out wire for the connection at the end of the sixth group.

[0234] Connect the 1S1 terminal, 2S1 terminal, 3S1 terminal, 4S1 terminal, 5S1 terminal, and 6S1 terminal of the first group at the beginning to the lead wires respectively, and label them as 1S1, 2S1, 3S1, 4S1, 5S1, 6S1; connect the 1S2 terminal, 2S2 terminal, 3S2 terminal, 4S2 terminal, 5S2 terminal, and 6S2 terminal of the first group at the end to the lead wires respectively, and label them as 1S2, 2S2, 3S2, 4S2, 5S2, 6S2; connect the 1S3 terminal, 2S3 terminal, 3S3 terminal, 4S3 terminal, 5S3 terminal, and 6S3 terminal of the second group at the end to the lead wires respectively, and label them as 1S3, 2S3, 3S3, 4S3, 5S3, 6S3; connect the 1S4 terminal, 2S4 terminal, 3S4 terminal, 4S4 terminal, 5S4 terminal, and 6S4 terminal of the third group at the end to the lead wires respectively, and label them as 1S4, 2S4, 3S4, 4S4, 5S4, 6S4; connect the 1S5 terminal, 2S5 terminal, 3S5 terminal, 4S5 terminal, 5S5 terminal, and 6S5 terminal of the fourth group at the end to the lead wires respectively, and label them as 1S5, 2S5, 3S5, 4S5, 5S5, 6S5.

[0235] The usage method of this embodiment is as follows:

[0236] The inter-turn overvoltage, FS / ALF, and error test tooling for the multi-ratio current transformer can connect up to six secondary windings of the current transformer simultaneously;

[0237] Connect the common terminal of the inter-turn overvoltage, FS / ALF, and error test tooling for the multi-ratio current transformer to the common terminal of the measurement circuit;

[0238] Connect the lead wires of 1S1, 2S1, 3S1, 4S1, 5S1, and 6S1 of the first group at the beginning to the 1S1, 2S1, 3S1, 4S1, 5S1, and 6S1 terminals of the secondary winding of the current transformer to be measured respectively;

[0239] Connect the lead wires of 1S2, 2S2, 3S2, 4S2, 5S2, and 6S2 of the first group at the end to the 1S2, 2S2, 3S2, 4S2, 5S2, and 6S2 terminals of the secondary winding of the current transformer to be measured respectively;

[0240] Connect the lead wires of 1S3, 2S3, 3S3, 4S3, 5S3, and 6S3 of the second group at the end to the 1S3, 2S3, 3S3, 4S3, 5S3, and 6S3 terminals of the secondary winding of the current transformer to be measured respectively;

[0241] Connect the lead wires of 1S4, 2S4, 3S4, 4S4, 5S4, and 6S4 of the third group at the end to the 1S4, 2S4, 3S4, 4S4, 5S4, and 6S4 terminals of the secondary winding of the current transformer to be measured respectively;

[0242] Lead out the wires of 1S5, 2S5, 3S5, 4S5, 5S5, and 6S5 in the fourth group at the end and connect them to the terminals of 1S5, 2S5, 3S5, 4S5, 5S5, and 6S5 of the secondary winding of the current transformer under test respectively.

[0243] Connect the power supplies to the A2 working power supply and the two universal four-control switches respectively, and then the test can be carried out.

[0244] The technical effects of this embodiment are as follows:

[0245] 1) It can switch the secondary test circuit of the current transformer under test to perform multi-ratio switching. This test tooling can be connected to a maximum of six windings, and each winding can be converted into 10 ratios, improving work efficiency.

[0246] 2) It can realize the secondary switching of different current ratios, including but not limited to more than 6 multi-ratio combinations such as MR600 / 5A, MR1200 / 5, MR2000 / 5,..., 5000 / 1 / 5A, etc.

[0247] 3) It is compact in design and convenient to move. When testing the inter-turn overvoltage, FS / ALF, and error test of the multi-ratio current transformer, only the secondary winding wiring needs to be connected once, avoiding the trouble of changing the wiring multiple times for each ratio.

[0248] 4) It is highly efficient, the tooling works stably and is not easily damaged, the components are standardized and easy to repair, solving the problems of complex traditional work operation, poor stability, and difficult maintenance.

[0249] The technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0250] The above-mentioned embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A multi-ratio current transformer test tool, arranged in a test area, for performing turn-to-turn overvoltage, FS / ALF, and error tests on the secondary winding of the current transformer, wherein the secondary winding of the current transformer comprises at least 3 terminals, characterized in that: include: A first output unit, wherein the first output unit comprises at least three first-type terminals and at least three second-type terminals, and at least one second-type terminal of the first output unit is connected to a starting terminal of at least one secondary winding of a transformer; At least one second output unit, the second output unit includes at least three first-type terminals and at least three second-type terminals, the first-type terminals of the second output unit are connected in series with the first-type terminals of the first output unit to form a common terminal, at least one second-type terminal of the second output unit is connected to the middle terminal of at least one transformer secondary winding, wherein the number of the first-type terminals of the second output unit is equal to the number of the first-type terminals of the first output unit; A third output unit, the third output unit comprising at least three first-type terminals and at least three second-type terminals, at least one second-type terminal of the third output unit being connected to an end terminal of at least one transformer secondary winding, wherein the number of the second-type terminals of the third output unit is equal to the number of the second-type terminals of the first output unit; At least one fourth output unit, the fourth output unit includes at least 3 first-type terminals and at least 3 second-type terminals, the first-type terminals of the fourth output unit are respectively connected in series with the first-type terminals of the third output unit in a one-to-one correspondence, the second-type terminals of the fourth output unit are respectively connected in parallel with the second-type terminals of the second output unit in a one-to-one correspondence, and at least one second-type terminal of the fourth output unit is connected to the middle terminal of at least one secondary winding of the transformer, wherein the number of the first-type terminals of the fourth output unit is equal to the number of the first-type terminals of the third output unit, and the number of the second-type terminals of the fourth output unit is equal to the number of the second-type terminals of the second output unit.

2. The multi-ratio current transformer test tool according to claim 1, characterized in that: The first output unit comprises: At least one first contact element, the first contact element comprising three first-type terminals and three second-type terminals, the first-type terminals of the first contact element being respectively connected in series with the first-type terminals of the second output unit, and at least one second-type terminal of the first contact element being connected with a starting terminal of at least one secondary winding of a transformer; and / or The second output unit comprises: At least one second contact element, the second contact element comprising three first-type terminals and three second-type terminals, the first-type terminals of the second contact element being respectively connected in series with the first-type terminals of the first output unit, the second-type terminals of the second contact element being connected in parallel with the second-type terminals of the fourth output unit in a one-to-one correspondence, and at least one second-type terminal of the second contact element being connected to an intermediate terminal of at least one secondary winding of a transformer; and / or The third output unit comprises: At least one third contact element, the third contact element comprising three first-type terminals and three second-type terminals, the first-type terminals of the third contact element being respectively connected in series with the first-type terminals of the fourth output unit in a one-to-one correspondence, and at least one second-type terminal of the third contact element being connected with the end terminal of at least one secondary winding of the transformer; and / or The fourth output unit comprises: At least one fourth contact element, the fourth contact element comprising three first-type terminals and three second-type terminals, the first-type terminals of the fourth contact element being respectively connected in series with the first-type terminals of the third output unit in a one-to-one correspondence, the second-type terminals of the fourth contact element being respectively connected in parallel with the second-type terminals of the second output unit in a one-to-one correspondence, and at least one of the second-type terminals of the fourth contact element being connected to an intermediate terminal of at least one secondary winding of a transformer.

3. The multi-ratio current transformer test tool according to claim 2, characterized in that: The first contact element comprises: The first contactor; a first output terminal, the first output terminal being disposed on the first contactor and connected in series with the first type terminal of the second output unit; a second output terminal, the second output terminal being disposed on the first contactor and being connected in series with the first output terminal and the first type terminal of the second output unit respectively; a third output terminal, the third output terminal being disposed on the first contactor and connected in series with the first output terminal, the second output terminal, and the first type terminal of the second output unit respectively; A first input terminal, which is disposed on the first contactor and is connected to a starting terminal of a secondary winding of a transformer; a second input terminal, the second input terminal being arranged on the first contactor and being connected to a starting terminal of a secondary winding of a transformer; a third input terminal, the third input terminal being arranged on the first contactor and being connected to a starting terminal of a secondary winding of a transformer; Wherein, the first input terminal, the second input terminal, and the third input terminal are respectively connected to three different transformer secondary windings; and / or The second contact element comprises: A second contactor; a fourth output terminal, the fourth output terminal being arranged on the second contactor and connected in series with the first type terminal of the first output unit; a fifth output terminal, the fifth output terminal being arranged on the second contactor and being respectively connected in series with the fourth output terminal and the first type terminal of the first output unit; a sixth output terminal, the sixth output terminal being disposed on the second contactor and being respectively connected in series with the fourth output terminal, the fifth output terminal, and the first type of terminal of the first output unit; A fourth input terminal, which is disposed on the second contactor and is connected in parallel with the corresponding second-type terminal of the fourth output unit and is connected to an intermediate terminal of a secondary winding of a transformer; a fifth input terminal, the fifth input terminal being arranged on the second contactor and being connected in parallel with the corresponding second-type terminal of the fourth output unit and being connected with a middle terminal of a secondary winding of a transformer; a sixth input terminal, the sixth input terminal being arranged on the second contactor and being connected in parallel with the corresponding second-type terminal of the fourth output unit and being connected with an intermediate terminal of a secondary winding of a transformer; The fourth input terminal, the fifth input terminal and the sixth input terminal are respectively connected to three different transformer secondary windings; and / or The third contact element comprises: The third contactor; a seventh output terminal, the seventh output terminal being disposed on the third contactor and connected in series with a corresponding first-type terminal of the fourth output unit; an eighth output terminal, the eighth output terminal being disposed on the third contactor and connected in series with a corresponding first-type terminal of the fourth output unit; a ninth output terminal, the ninth output terminal being disposed on the third contactor and connected in series with a corresponding first-type terminal of the fourth output unit; A seventh input terminal, the seventh input terminal is arranged on the third contactor and is connected to the end terminal of a secondary winding of a transformer; An eighth input terminal, the eighth input terminal being arranged on the third contactor and being connected to a terminal end of a secondary winding of a transformer; A ninth input terminal, the ninth input terminal being arranged on the third contactor and connected to a terminal end of a secondary winding of a transformer; The seventh input terminal, the eighth input terminal and the ninth input terminal are respectively connected to three different transformer secondary windings; and / or The fourth contact element comprises: The fourth contactor; a tenth output terminal, the tenth output terminal being disposed on the fourth contactor and connected in series with a corresponding first-type terminal of the third output unit; an eleventh output terminal, the eleventh output terminal being disposed on the fourth contactor and connected in series with a corresponding first-type terminal of the third output unit; a twelfth output terminal, the twelfth output terminal being disposed on the fourth contactor and connected in series with a corresponding first-type terminal of the third output unit; a tenth input terminal, the tenth input terminal being arranged on the fourth contactor and being connected in parallel with the corresponding second-type terminal of the second output unit and being connected with an intermediate terminal of a secondary winding of a transformer; an eleventh input terminal, the eleventh input terminal being arranged on the fourth contactor, and being connected in parallel with the corresponding second-type terminal of the second output unit, and being connected with an intermediate terminal of a secondary winding of a transformer; A twelfth input terminal, which is disposed on the fourth contactor and is connected in parallel with the corresponding second-type terminal of the second output unit and is connected to a middle terminal of a secondary winding of a transformer; The tenth input terminal, the eleventh input terminal and the twelfth input terminal are respectively connected to three different transformer secondary windings.

4. The multi-ratio current transformer test tool according to claim 2, characterized in that: There are a plurality of first contact elements, and the first type terminals of the plurality of first contact elements are connected in series; and / or There are a plurality of second contact elements, and the first type terminals of the plurality of second contact elements are connected in series; and / or There are a plurality of third contact elements, and the plurality of third contact elements are arranged in parallel; and / or There are a plurality of the fourth contact elements, and the plurality of the fourth contact elements are arranged in parallel.

5. The multi-ratio current transformer test tool according to claim 1, characterized in that: There are a plurality of second output units, the first terminals of a plurality of the second output units are connected in series with the first terminals of the first output unit to form a common terminal, the second terminals of a plurality of the second output units are respectively connected in parallel with the second terminals of the corresponding fourth output units in a one-to-one correspondence, and at least one second terminal of each second output unit is connected to the middle terminal of at least one secondary winding of the transformer; and / or There are a plurality of the fourth output units, and the first type terminals of the plurality of the fourth output units are respectively connected in series with the first type terminals of the third output units in a one-to-one correspondence, and the second type terminals of the plurality of the fourth output units are respectively connected in parallel with the second type terminals of the corresponding second output units in a one-to-one correspondence, and at least one second type terminal of each of the fourth output units is connected to the middle terminal of at least one secondary winding of the transformer.

6. The multi-ratio current transformer test tool according to claim 1, characterized in that: The number of the second output units is equal to the number of the fourth output units.

7. The multi-ratio current transformer test tool according to any one of claims 1 to 6, characterized in that: Also includes: A lead-out unit, wherein the lead-out unit is respectively connected to the first output unit, at least one of the second output units, the third output unit, at least one of the fourth output units, and at least one secondary winding of a mutual inductor; and / or A cable unit, wherein the cable unit is respectively connected to the first output unit, at least one of the second output units, the third output unit, at least one of the fourth output units, and a working power supply.

8. The multi-ratio current transformer testing tool according to claim 7, characterized in that: The extraction unit comprises: A first lead-out element, wherein the first lead-out element is respectively connected to a first-type terminal of the first output unit and at least one first-type terminal of the second output unit; at least three second lead-out elements, each of which is connected to the second type of terminals of the first output unit in a one-to-one correspondence; at least three third lead-out elements, the third lead-out elements being respectively connected to the second type of terminals of the second output unit and the second type of terminals of the fourth output unit in a one-to-one correspondence; at least three fourth lead-out elements, the fourth lead-out elements being respectively connected to the first type of terminals of the third output unit and the first type of terminals of the fourth output unit in a one-to-one correspondence; at least three fifth lead-out elements, the fifth lead-out elements being respectively connected to the second-type terminals of the third output unit in a one-to-one correspondence; At least three sixth lead-out elements are respectively connected to the second type terminals of the fourth output unit in a one-to-one correspondence.

9. The multi-ratio current transformer testing tool according to claim 8, characterized in that: The number of the second lead-out elements is equal to the number of the second type terminals of the first output unit; and / or The number of the third lead-out elements is equal to the number of the second type terminals of the second output unit; and / or The number of the fourth lead-out elements is equal to the number of the first-type terminals of the third output unit; and / or The number of the fifth lead-out elements is equal to the number of the second-type terminals of the third output unit; and / or The number of the sixth lead-out elements is equal to the number of the second-type terminals of the fourth output unit.

10. The multi-ratio current transformer testing tool according to claim 7, characterized in that: Also includes: A clamping unit, wherein the clamping unit is arranged at an end of the lead-out unit; and / or a first switch unit, wherein the first switch unit is respectively connected to the first output unit, at least one of the second output units, and the cable unit; A second switch unit, wherein the second switch unit is respectively connected to the third output unit, at least one fourth output unit, and the cable unit.

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