Intelligent hexagonal image detection device and detection method

Abstract

The present application relates to an intelligent hexagonal diagram detection device and detection method, wherein the device includes a power supply module and a processing circuit that are interconnected; the power supply module is used to supply power to the current transformer and the processing circuit on the high-voltage side of the transformer; the processing circuit is used to connect to the substation communication processing equipment, obtain the electrical parameter data generated by the transformer protection and control device connected to the substation communication processing equipment, and determine the hexagonal diagram vector diagram based on the electrical parameter data, and output the wiring status detection result based on the hexagonal diagram vector diagram; the present application effectively improves the detection efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of electrical testing instruments, and in particular to an intelligent hexagonal pattern detection device and detection method. Background Art

[0002] After a new substation is put into use of a transformer or an old substation is renovated and replaced with a new transformer, a hexagonal diagram experiment is required before the transformer is put into operation. By checking the phase relationship of the high and low voltage side currents of the transformer and the differential current and braking current values, the phase sequence, polarity and balance coefficient calculation of each current circuit of the differential protection are checked to see if they are correct, so as to avoid malfunction of the differential protection during the impact test of the transformer or after it is put into operation.

[0003] The current testing method usually introduces a 380V AC power supply at the current transformer on the high-voltage side of the transformer, and grounds the switch cabinet on the low-voltage side of the transformer. The high- and low-voltage side voltage and current phasor hexagonal diagram is drawn through monitoring means, and then it is necessary to manually judge whether the drawn hexagonal diagram is correct, so as to judge whether the current and voltage secondary wiring is correct. In addition, the phase derivation process of the low-voltage power-on hexagonal diagram of transformers of various types of wiring groups is extremely complicated. It can be seen that the current testing method has the problem of low detection efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide an intelligent hexagonal image detection device and detection method to address the above technical problems.

[0005] In order to achieve the above-mentioned object, on the one hand, an embodiment of the present application provides an intelligent hexagonal pattern detection device, including a power supply module and a processing circuit connected to each other;

[0006] The power module is used to connect the current transformer on the high voltage side of the transformer, and is used to connect to the current transformer on the low voltage side of the transformer through the current transformer on the high voltage side of the transformer; the power module is used to supply power to the current transformer on the high voltage side of the transformer and the processing circuit;

[0007] The processing circuit is used to connect to the substation communication processing equipment and obtain the electrical parameter data generated by the transformer protection measurement and control device connected to the substation communication processing equipment; the electrical parameter data includes three-phase voltage angle data on the high-voltage side, three-phase current angle data on the high-voltage side and two-phase current angle data on the low-voltage side; the processing circuit is used to determine the hexagonal diagram vector diagram according to the electrical parameter data, and output the wiring status detection result based on the hexagonal diagram vector diagram.

[0008] In one embodiment, the power module includes an AC-AC boost module, a mobile power supply, and an AC-DC conversion circuit connected in sequence;

[0009] The AC-DC conversion circuit is connected to the processing circuit; the AC-AC boost module is used to connect the current transformer on the high voltage side of the transformer.

[0010] In one embodiment, it further includes a test terminal and a communication device;

[0011] Among them, one end of the communication device is connected to the processing circuit, and the other end is used to connect to the substation communication processing device, and the communication device is used to enable the processing circuit to communicate with the substation communication processing device;

[0012] One end of the test terminal is connected to the power module, and the other end is used to connect the current transformer on the high-voltage side of the transformer.

[0013] In one embodiment, it further includes a display device connected to the processing circuit;

[0014] The display device is used to display the hexagonal diagram vector diagram and the wiring status detection results.

[0015] A method for detecting the connection status of a secondary circuit of a transformer differential protection is applied to a processing circuit in the above-mentioned intelligent hexagonal diagram detection device, and the method comprises the steps of:

[0016] Receive electrical parameter data transmitted by the substation communication processing equipment; the electrical parameter data is data generated by the transformer protection measurement and control device connected to the substation communication processing equipment; the electrical parameter data includes three-phase voltage angle data on the high-voltage side, three-phase current angle data on the high-voltage side, and two-phase current angle data on the low-voltage side;

[0017] A hexagonal diagram vector diagram is determined according to the electrical parameter data, and a wiring status detection result is output based on the hexagonal diagram vector diagram.

[0018] In one embodiment, the step of outputting the wiring status detection result based on the hexagonal vector diagram includes:

[0019] Obtain the standard hexagonal diagram vector diagram, compare the hexagonal diagram vector diagram with the standard hexagonal diagram vector diagram, and determine whether the differential protection secondary circuit is connected correctly.

[0020] In one embodiment, the step of obtaining a standard hexagonal vector diagram includes:

[0021] Obtain the corresponding standard hexagonal vector diagram according to the connection groups of each type of transformer.

[0022] In one embodiment, the step of obtaining the standard hexagonal vector diagram includes:

[0023] Obtaining voltage phase data on the high-voltage side of the transformer; determining voltage phase data on the low-voltage side according to the voltage phase data on the high-voltage side; determining current phase data on the high-voltage side based on the voltage phase data on the low-voltage side;

[0024] According to the high voltage side current phase data, the standard hexagonal diagram vector diagram is determined.

[0025] A transformer differential protection secondary circuit connection state detection device, the device is applied to the processing circuit in the above-mentioned intelligent hexagonal diagram detection device, and the device includes:

[0026] The data receiving module is used to receive the electrical parameter data transmitted by the substation communication processing equipment; the electrical parameter data is the data generated by the transformer protection measurement and control device connected to the substation communication processing equipment; the electrical parameter data includes the three-phase voltage angle data on the high-voltage side, the three-phase current angle data on the high-voltage side and the two-phase current angle data on the low-voltage side;

[0027] The detection module is used to determine the hexagonal diagram vector diagram according to the electrical parameter data, and output the wiring status detection result based on the hexagonal diagram vector diagram.

[0028] A computer-readable storage medium stores a computer program, which implements the steps of the above method when executed by a processor.

[0029] One of the above technical solutions has the following advantages and beneficial effects:

[0030] The present application determines the hexagonal diagram vector diagram according to the acquired electrical parameter data through a processing circuit, and thus outputs the wiring status detection result based on the hexagonal diagram vector diagram; the present application completes the determination of the hexagonal diagram vector diagram and the judgment of the wiring status of the secondary circuit of the transformer differential protection through a processing circuit, which greatly reduces the technical threshold mastered by the test personnel and effectively improves the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic diagram of the structure of an intelligent hexagonal image detection device in one embodiment;

[0033] Figure 2 A schematic diagram of the specific structure of an intelligent hexagonal image detection device in one embodiment;

[0034] Figure 3 It is a schematic flow chart of a method for detecting a connection state of a secondary circuit of a transformer differential protection in one embodiment;

[0035] Figure 4A schematic diagram of a measured low-voltage side current angle and a standard low-voltage side current angle of a three-phase V / V0 transformer in an embodiment;

[0036] Figure 5 A schematic diagram of the flow direction of each phase current of a Y / △-11 connection transformer in one embodiment;

[0037] Figure 6 A schematic diagram of the current relationship of the low-voltage side winding of a Y / △-11 connection transformer in an embodiment;

[0038] Figure 7 A schematic diagram of a process for determining a standard hexagonal diagram vector diagram of a Y / △-11 connection transformer in one embodiment;

[0039] Figure 8 A schematic diagram of a process for determining a standard hexagonal vector diagram of a Y / V impedance matching balancing transformer in one embodiment;

[0040] Fig. 9 A schematic diagram of the flow direction of each phase current of a Y / V impedance matching balancing transformer in one embodiment;

[0041] Fig.10 A schematic diagram of a process for determining a standard hexagonal vector diagram of a YN / A balancing transformer in one embodiment;

[0042] Fig.11 A schematic diagram of the flow direction of each phase current of a YN / A balancing transformer in one embodiment;

[0043] Fig.12 A schematic diagram of a process for determining a standard hexagonal diagram vector diagram of a SCOTT connection transformer in one embodiment;

[0044] Fig.13 A schematic diagram of the flow direction of each phase current of a SCOTT connection transformer in one embodiment;

[0045] Fig.14 A schematic diagram of a process for determining a standard hexagonal diagram vector diagram of a three-phase V / V0 connection transformer in one embodiment;

[0046] Fig.15 A schematic diagram of the flow direction of currents of each phase of a three-phase V / V0 connection transformer in one embodiment;

[0047] Fig.16 A schematic diagram of a process for determining a standard hexagonal diagram vector diagram of a three-phase V / V6 connection transformer in one embodiment;

[0048] Fig.17 A schematic diagram of the flow direction of currents of each phase of a three-phase V / V6 connection transformer in one embodiment;

[0049] Fig.18 A schematic diagram of a process for determining a standard hexagonal diagram vector diagram of a single-phase connection transformer in one embodiment;

[0050] Fig.19 The figure is a schematic diagram of the flow direction of each phase current of a single-phase connection transformer in one embodiment. DETAILED DESCRIPTION

[0051] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0053] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0054] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0055] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0056] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0057] The currently known technology, such as a hexagonal diagram drawing device disclosed in the patent with application number 201420050268.1, includes an indoor unit and an outdoor unit, wherein the outdoor unit includes: an adjustable current generator, a current measurement module, a high-voltage measurement terminal, a terminal switching circuit, a first communication module, and a main control module; the indoor unit includes: a high-voltage secondary measurement terminal, a low-voltage secondary measurement terminal, a secondary current measurement circuit, a central processing unit, a second communication module, and a display screen, and the first communication module and the second communication module are connected in communication. The outdoor unit is responsible for adding current to the high-voltage side winding of the transformer, and the indoor unit is responsible for measuring the secondary current of each phase on the high and low voltage sides, drawing the hexagonal diagram of the transformer and displaying it on the display screen. It can be seen that the technical solution disclosed in this patent has the following deficiencies: ① It is divided into indoor unit and outdoor unit, and the multi-point arrangement is relatively cumbersome; ② Both the indoor unit and the outdoor unit are equipped with measurement circuits, but the current substations are generally comprehensive automated substations, and their comprehensive automated microcomputer protection devices already have high and low voltage side voltage and current monitoring functions. Such a setting undoubtedly increases the structural complexity of the indoor unit and the outdoor unit; ③ It is necessary to manually judge whether the drawn hexagonal diagram is correct; ④ Its technical solution is to apply a constant current source, but the high voltage side voltage is a constant voltage source during transformer operation, and the load current is variable.

[0058] The intelligent hexagonal diagram detection device provided in the present application does not require the indoor and outdoor units to be distributed in multiple locations, and adopts a constant voltage source output, which is more in line with the actual operating status of the transformer; it can determine the hexagonal diagram vector diagram based on the electrical parameter data, and further based on the hexagonal diagram vector diagram, quickly determine whether the secondary circuit of the transformer differential protection is connected correctly; it reduces the technical threshold mastered by the test personnel and realizes the improvement of detection efficiency.

[0059] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with 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.

[0060] In one embodiment, Figure 1 As shown, an intelligent hexagonal pattern detection device is provided, comprising a power supply module 110 and a processing circuit 120 connected to each other;

[0061] The power module 110 is used to connect the current transformer on the high voltage side of the transformer, and is used to connect to the current transformer on the low voltage side of the transformer through the current transformer on the high voltage side of the transformer; the power module 110 is used to supply power to the current transformer on the high voltage side of the transformer and the processing circuit 120;

[0062] The processing circuit 120 is used to connect to the substation communication processing equipment and obtain the electrical parameter data generated by the transformer protection and measurement and control device connected to the substation communication processing equipment; the electrical parameter data includes three-phase voltage angle data on the high-voltage side, three-phase current angle data on the high-voltage side and two-phase current angle data on the low-voltage side; the processing circuit 120 is used to determine the hexagonal diagram vector diagram according to the electrical parameter data, and output the wiring status detection result based on the hexagonal diagram vector diagram.

[0063] Specifically, the intelligent hexagonal diagram detection device includes a cover body and a box body, wherein the box body includes a power supply module 110 and a processing circuit 120 which are interconnected. The power supply module 110 is used to provide a constant voltage source. After the three-phase current transformer on the high-voltage side of the transformer (the current transformer on the high-voltage side) is energized, the grounding knife on the low-voltage side switch cabinet of the transformer is closed or the low-voltage side trolley of the transformer is grounded. Since the current transformer on the low-voltage side of the transformer (the current transformer on the low-voltage side) is in the switch cabinet on the low-voltage side of the transformer or in the trolley on the low-voltage side of the transformer, the entire power-on circuit is connected through the substation ground network. At this time, in the substation integrated automation system, the transformer integrated measurement and control device and the differential protection measurement and control device respectively monitor the voltage and current phase of the high and low voltage sides of the transformer. , and obtains the electrical parameter data of the high and low voltage sides of the transformer through the processing circuit 120. Further, the electrical parameter data may include three-phase voltage angle data on the high voltage side (three-phase voltage phase data on the high voltage side), three-phase current angle data on the high voltage side (three-phase current phase data on the high voltage side) and two-phase current angle data on the low voltage side (two-phase current phase data on the low voltage side), so that the processing circuit 120 calculates and processes the electrical parameter data to obtain a hexagonal diagram vector diagram, and then automatically determines the abnormal phase sequence and electrical quantity according to the hexagonal diagram vector diagram, and gives the detection results. The detection results include the evaluation results of the connection status of the differential protection secondary circuit. In some examples, the processing circuit 120 can be implemented using a central processing unit.

[0064] The above-mentioned intelligent hexagonal diagram detection device completes the determination of the hexagonal diagram vector diagram and the evaluation of the wiring status through the processing circuit 120 with calculation and judgment capabilities, and does not require an external power supply. It can quickly detect and judge the wiring status of the transformer differential protection secondary circuit, greatly improving the detection efficiency.

[0065] In one embodiment, the power module 110 includes an AC-AC boost module, a mobile power supply, and an AC-DC conversion circuit connected in sequence;

[0066] The AC-DC conversion circuit is connected to the processing circuit 120; the AC-AC boost module is used to connect to the current transformer at the high voltage side of the transformer.

[0067] Specifically, in some examples, the mobile power supply can be a 220V mobile power supply, and further, the AC-AC boost module can be a 220V to 380V boost module; after the device is turned on, the L and N terminals of the 220V mobile power supply output 220V voltage, which is electrically connected and input to the L and N terminals of the boost module. After the L and N terminals of the boost module are powered, a 380V three-phase voltage is output at its A, B, and C terminals.

[0068] In one embodiment, it further includes a test terminal and a communication device;

[0069] Among them, one end of the communication device is connected to the processing circuit 120, and the other end is used to connect to the substation communication processing device, and the communication device is used to enable the processing circuit 120 to communicate with the substation communication processing device;

[0070] One end of the test terminal is connected to the power module 110 , and the other end is used to connect to the current transformer at the high-voltage side of the transformer.

[0071] In one embodiment, a display device connected to the processing circuit 120 is also included;

[0072] The display device is used to display the hexagonal diagram vector diagram and the wiring status detection results.

[0073] Specifically, the box housing is installed with test terminals. In some examples, the test terminals can be three-phase test terminals. Further, the A, B, and C test terminals are electrically connected to the A, B, and C terminals of the boost module in the power module 110, and are electrically connected to the current transformer on the high-voltage side of the transformer through output wires and test clips.

[0074] In some examples, the communication device can be a communication network cable. The device has a communication interface and uses a network cable to directly connect to the network port of the substation integrated automation system communication processing host (substation communication processing equipment) to obtain the high and low voltage side voltage and current phasors, phases and other information of the transformer comprehensive measurement and control device in the substation; the display device can be realized by using a touch screen.

[0075] In a specific example, the specific structural diagram of the intelligent hexagonal image detection device is as follows: Figure 2 shown.

[0076] The above-mentioned intelligent hexagonal diagram detection device has a simple and portable structure. It does not require indoor and outdoor units to be distributed in multiple locations, and only one device can complete the work. It adopts a constant voltage source output, and can carry out test pressurization work without an external power supply, which is more in line with the actual operating status of the transformer. Through the communication network cable, the communication processing host of the existing integrated automation system of the substation is used to obtain electrical parameter data, and the central processing unit with calculation and judgment capabilities is used to complete the detection, which reduces the technical threshold mastered by the test personnel and effectively improves the test efficiency.

[0077] In one embodiment, Figure 3 As shown, a method for detecting the connection state of a secondary circuit of a transformer differential protection is provided. The method is applied to the processing circuit 120 in the above-mentioned intelligent hexagonal diagram detection device. The method comprises the steps of:

[0078] Step S310, receiving electrical parameter data transmitted by the substation communication processing equipment; the electrical parameter data is data generated by the transformer protection measurement and control device connected to the substation communication processing equipment; the electrical parameter data includes high-voltage side three-phase voltage angle data, high-voltage side three-phase current angle data and low-voltage side two-phase current angle data;

[0079] Step S320, determining a hexagonal vector diagram according to the electrical parameter data, and outputting a wiring status detection result based on the hexagonal vector diagram.

[0080] Specifically, the received electrical parameter data may include three-phase voltage angle data on the high-voltage side, three-phase current angle data on the high-voltage side, and two-phase current angle data on the low-voltage side. Further, the three-phase voltage angle data on the high-voltage side are voltage angle data of each phase A, B, and C on the high-voltage side; the three-phase current angle data on the high-voltage side are current angle data of each phase A, B, and C on the high-voltage side; the two-phase current angle data on the low-voltage side are current angle data of each phase A and B on the low-voltage side;

[0081] Furthermore, based on the voltage angle data and current angle data of each phase A, B, and C on the high-voltage side, and the current angle data of each phase A and B on the low-voltage side, the hexagonal diagram vector diagram of the tested transformer can be determined, thereby judging the wiring status of the secondary circuit of the transformer differential protection based on the hexagonal diagram vector diagram and outputting the detection results.

[0082] The above transformer differential protection secondary circuit wiring status detection method obtains a hexagonal diagram vector diagram by processing the received electrical parameter data, thereby outputting the wiring status detection result of the differential protection secondary circuit, realizing rapid judgment on whether the transformer differential protection secondary circuit is correctly connected, and improving the detection efficiency.

[0083] In one embodiment, the step of outputting the wiring status detection result based on the hexagonal vector diagram includes:

[0084] Obtain the standard hexagonal diagram vector diagram, compare the hexagonal diagram vector diagram with the standard hexagonal diagram vector diagram, and determine whether the differential protection secondary circuit is connected correctly.

[0085] In one embodiment, the step of obtaining a standard hexagonal vector diagram includes:

[0086] Obtain the corresponding standard hexagonal vector diagram according to the connection groups of each type of transformer.

[0087] Specifically, before the test of the intelligent hexagonal diagram detection device begins, the type of transformer to be tested is selected on the touch screen, and the central processor selects the matching standard in the database according to the information set by the test personnel, that is, obtains the standard hexagonal diagram vector diagram corresponding to each type of transformer wiring group, and compares it with the hexagonal diagram vector diagram determined during the test. Through the comparison, it can be determined whether the differential protection secondary circuit is correctly connected and obtain the corresponding alarm conclusion.

[0088] In some examples, each type of transformer connection group may include a three-phase VX transformer, a Y / △-11 connection transformer, a SCOTT connection transformer, a Y / V impedance matching balance transformer, a YN / A balance transformer, a three-phase V / V0 connection transformer, a three-phase V / V6 connection transformer, and a single-phase connection transformer; wherein the high-voltage side three-phase voltage angle data, the high-voltage side three-phase current angle data, and the low-voltage side two-phase current angle data of the three-phase VX transformer standard are respectively:

[0089] Three-phase voltage angle data on the high-voltage side: ∠UA=0°, ∠UB=240°, ∠UC=120°; three-phase current angle data on the high-voltage side: ∠IhA=0°, ∠IhB=60°, ∠IhC=210°; two-phase current angle data on the low-voltage side: ∠I1a=180°, ∠I1b=240°;

[0090] The three-phase voltage angle data, three-phase current angle data and two-phase current angle data of the high-voltage side of the Y / △-11 connection transformer are as follows:

[0091] The three-phase voltage angle data on the high-voltage side are: ∠UA=0°, ∠UB=240°, ∠UC=120°; the three-phase current angle data on the high-voltage side are: ∠IhA=0°, ∠IhB=259.1°, ∠IhC=158.2°; the two-phase current angle data on the low-voltage side are: ∠I1a=199.1°, ∠I1b=139.1°;

[0092] The three-phase voltage angle data on the high-voltage side, the three-phase current angle data on the high-voltage side, and the two-phase current angle data on the low-voltage side of the SCOTT connection transformer are:

[0093] Three-phase voltage angle data on the high-voltage side: ∠UA = 0°, ∠UB = 240°, ∠UC = 120°; three-phase current angle data on the high-voltage side: ∠IhA = 0°, ∠IhB = 240°, ∠IhC = 120°; two-phase current angle data on the low-voltage side: ∠I1a = 240°, ∠I1b = 330°;

[0094] The three-phase voltage angle data on the high-voltage side, the three-phase current angle data on the high-voltage side, and the two-phase current angle data on the low-voltage side of the Y / V impedance matching balance transformer are:

[0095] Three-phase voltage angle data on the high-voltage side: ∠UA=0°, ∠UB=240°, ∠UC=120°; three-phase current angle data on the high-voltage side: ∠IhA=0°, ∠IhB=240°, ∠IhC=120°; two-phase current angle data on the low-voltage side: ∠I1a=195°, ∠I1b=105°;

[0096] The three-phase voltage angle data, three-phase current angle data and two-phase current angle data of the high-voltage side of the YN / A balancing transformer are as follows:

[0097] Three-phase voltage angle data on the high-voltage side: ∠UA=0°, ∠UB=240°, ∠UC=120°; three-phase current angle data on the high-voltage side: ∠IhA=0°, ∠IhB=240°, ∠IhC=120°; two-phase current angle data on the low-voltage side: ∠I1a=195°, ∠I1b=105°;

[0098] The three-phase voltage angle data on the high-voltage side, the three-phase current angle data on the high-voltage side, and the two-phase current angle data on the low-voltage side of the three-phase V / V0 transformer are:

[0099] Three-phase voltage angle data on the high-voltage side: ∠UA=0°, ∠UB=240°, ∠UC=120°; three-phase current angle data on the high-voltage side: ∠IhA=0°, ∠IhB=60°, ∠IhC=210°; two-phase current angle data on the low-voltage side: ∠I1a=180°, ∠I1b=240°;

[0100] The three-phase voltage angle data on the high-voltage side, the three-phase current angle data on the high-voltage side, and the two-phase current angle data on the low-voltage side of the three-phase V / V6 connection transformer are:

[0101] Three-phase voltage angle data on the high-voltage side: ∠UA=0°, ∠UB=240°, ∠UC=120°; three-phase current angle data on the high-voltage side: ∠IhA=0°, ∠IhB=60°, ∠IhC=210°; two-phase current angle data on the low-voltage side: ∠I1a=180°, ∠I1b=240°;

[0102] The three-phase voltage angle data on the high-voltage side, the three-phase current angle data on the high-voltage side, and the two-phase current angle data on the low-voltage side of the single-phase transformer are:

[0103] Three-phase voltage on the high-voltage side: ∠UA=0°, ∠UB=180°; three-phase current on the high-voltage side ∠IhA=0°, ∠IhB=60°, ∠IhC=210°; two-phase current on the low-voltage side ∠I1a=180°, ∠I1b=240°.

[0104] In order to better illustrate the technical solution of the present application, a specific example is given below:

[0105] A transformer in a substation was tested for hexagon diagrams. The tester set the transformer connection group type to a three-phase V / V0 transformer. The measured values ​​of the low-voltage power-on electrical parameter data obtained by the central processor in the intelligent hexagon diagram detection device through the integrated automation system communication processing host are as follows:

[0106] The three-phase voltage angle data on the high-voltage side are: ∠UA=0°, ∠UB=240°, ∠UC=120°; the three-phase current angle data on the high-voltage side are: ∠IhA=0°, ∠IhB=59°, ∠IhC=220°; the two-phase current angle data on the low-voltage side are: ∠I1a=0°, ∠I1b=60°;

[0107] The CPU analyzes the data and finds that the two-phase current angle on the low-voltage side is the opposite of the two-phase current angle on the low-voltage side in the standard hexagonal vector diagram of the three-phase V / V0 transformer, such as Figure 4 As shown in the figure Indicates the standard low-voltage side two-phase current angle data of the three-phase V / V0 transformer, I a ,I b It represents the measured two-phase current angle data on the low-voltage side of the three-phase V / V0 transformer, so the central processor issues an alarm through the display screen: the polarity of the differential coil of the current transformer on the low-voltage side of the transformer is reversed, please check.

[0108] In one embodiment, the step of obtaining the standard hexagonal vector diagram includes:

[0109] Obtaining voltage phase data on the high-voltage side of the transformer; determining voltage phase data on the low-voltage side according to the voltage phase data on the high-voltage side; determining current phase data on the high-voltage side based on the voltage phase data on the low-voltage side;

[0110] According to the high voltage side current phase data, the standard hexagonal diagram vector diagram is determined.

[0111] Specifically, the standard hexagonal diagram vector (phase) diagram relationship is derived. First, the voltage phase on the high-voltage side of the transformer is derived from the phase sequence of the external power supply; secondly, the voltage phase on the low-voltage side is derived from the three-phase voltage phase sequence on the high-voltage side; then, the current phase on the low-voltage side is derived from the voltage on the low-voltage side; and the current phase on the high-voltage side is inversely derived from the current phase on the low-voltage side; finally, after the current phases on the high and low voltage sides are obtained, the corresponding relationship between the current connections of each phase of the differential protection device is combined to obtain the correct current phase of the standard hexagonal diagram experiment;

[0112] In order to better illustrate the technical solution of the present application, some specific examples are given below:

[0113] The current of each phase of Y / Δ-11 connection transformer is as follows Figure 5 As shown, each current in the figure is a vector, W1 and W2 are the number of winding turns; is the primary current of CT, is the CT secondary current, It is the current of phase A on the high voltage side of the transformer differential protection device, and the currents of other phases are similar; "*" indicates the positive end of the current collection circuit of each phase of the differential protection device or the same-name end of the transformer; is the ratio of high-voltage and low-voltage windings of the transformer; n H is the high pressure side flow interconversion ratio; n L is the low-pressure side flow interconversion ratio;

[0114] Depend on Figure 5 It can be seen that phase A on the high-voltage side of the transformer is connected to phase A of the power supply, phase B is connected to phase B of the power supply, and phase C is connected to phase C of the power supply. Therefore, the phase sequence (phase) of the three-phase voltage on the high-voltage side of the transformer can be obtained; combined with the principle of the Y / Δ-11 connection transformer of the electrified railway traction substation, that is, and Same phase, and Same phase, and The phase difference is 60 degrees, and the voltage phase sequence on the low-voltage side of the transformer can be derived. When the low-voltage side bus is short-circuited and grounded, the phase difference between the bus voltage and current is the short-circuit impedance angle. If a metallic short circuit is made, the short-circuit impedance angle can be considered to be 0. Therefore, the current phase on the low-voltage side can be derived by combining the voltage phase sequence on the low-voltage side of the transformer. The current relationship of the low-voltage side winding of the Y / Δ-11 connection transformer in the electrified railway traction substation is as follows: Figure 6 As shown, according to the superposition principle (i.e. and The currents of each phase in the low-voltage side triangle winding can be calculated according to the following formula (1):

[0115]

[0116] According to the principle of magnetic potential balance, we can get formula (2):

[0117]

[0118] According to formula (2), formula (3) can be derived:

[0119]

[0120] According to equation (1) and equation (3), the following equation (4) is derived:

[0121]

[0122] When doing the short-circuit test, the short-circuit currents of the two power supply arms are equal, and the phase difference is 60 degrees. but Substituting it into formula (4) we can get Calculated by the following formula (5):

[0123]

[0124] same Calculated by the following formula (6):

[0125]

[0126] Combining the low-voltage side current phase and equations (5) and (6) to obtain the high-voltage side current phase, Figure 5 Corresponding relationship between current connections of each phase of the differential protection device (high voltage side) and In phase, high voltage side and In phase, high voltage side and In phase; low voltage side and Inverting, and Reverse phase), the phase relationship of each phase current of the differential protection device can be derived, taking the high voltage side as As the reference phase, the current phases in the phase relationship of each phase of the differential protection device are rotated counterclockwise by 19.1 degrees (that is, Rotate to 0 degree position) to obtain the true current phase observed from the differential protection device;

[0127] The above current phase derivation process is as follows Figure 7 As shown, when doing the hexagon diagram experiment, the standard high-voltage side three-phase voltage angle data, high-voltage side three-phase current angle data and low-voltage side two-phase current angle data of the Y / Δ-11 connection transformer are:

[0128] High voltage side three-phase voltage angle data: High voltage side three-phase current angle data: Two-phase current angle data on the low voltage side:

[0129] The derivation process of the standard hexagonal diagram vector diagram of the Y / V impedance matching balanced transformer is as follows Figure 8 As shown, the current of each phase of the Y / V impedance matching balance transformer is as follows Fig. 9 As shown by Fig. 9 The three-phase voltage phase sequence of the high-voltage side of the transformer can be obtained; since the Y / V impedance matching balance transformer is developed on the basis of the Y / Δ-11 connection transformer, when the three-phase voltage on the high-voltage side is symmetrical, the two-phase voltage on the low-voltage side is also symmetrical, that is, equal in magnitude and with a phase difference of 90 degrees, thus obtaining the voltage phase sequence on the low-voltage side of the transformer; when the low-voltage side bus is short-circuited and grounded, the phase difference between the bus voltage and current is the short-circuit impedance angle. If a metallic short circuit is made, the short-circuit impedance angle can be considered to be 0, so the low-voltage side current phase can be derived in combination with the transformer low-voltage side voltage phase sequence; and then the current relationship between the high-voltage and low-voltage side windings of the Y / V impedance matching balance transformer is shown in the following formula (7):

[0130]

[0131] When doing the hexagonal diagram experiment, The magnitudes are equal, and the phase difference is 90 degrees. Substituting into the above formula (7) and simplifying it, we can get the following formula (8):

[0132]

[0133] From formula (8), we can see Hysteresis 15 degrees, Hysteresis 135 degrees, Ahead of the times 105 degrees, so the phase relationship of the high-voltage side current can be obtained; combined with Fig. 9 The corresponding relationship between the wiring of each phase of the differential protection device can be used to derive the phase relationship of the current of each phase of the differential protection device;

[0134] Therefore, when doing the hexagonal diagram experiment, the three-phase voltage angle data on the high-voltage side, the three-phase current angle data on the high-voltage side, and the two-phase current angle data on the low-voltage side of the Y / V impedance matching balance transformer standard are:

[0135] High voltage side three-phase voltage angle data: High voltage side three-phase current angle data: Two-phase current angle data on the low voltage side:

[0136] The derivation process of the standard hexagonal diagram vector diagram of the YN / A balancing transformer is as follows Fig.10 As shown in the figure, the differential equation of the YN / A balancing transformer is derived based on the transformer external fault being positive polarity, where the currents of each phase of the YN / A balancing transformer are as follows: Fig.11 As shown by Fig.11 The three-phase voltage phase sequence of the high-voltage side of the transformer can be obtained; since the YN / A balanced transformer is developed on the basis of the Y / V impedance matching balanced transformer, when the three-phase voltage on the high-voltage side is symmetrical, the two-phase voltage on the low-voltage side is also symmetrical, that is, equal in magnitude and with a phase difference of 90 degrees, thus the voltage phase on the low-voltage side of the transformer can be obtained; when the low-voltage side bus is short-circuited and grounded, the phase difference between the bus voltage and current is the short-circuit impedance angle. If a metallic short circuit is made, the short-circuit impedance angle can be considered to be 0, so the low-voltage side current phase can be derived in combination with the transformer low-voltage side voltage phase; and then the current relationship between the high-voltage and low-voltage side windings of the YN / A balanced transformer is shown in the following formula (9):

[0137]

[0138] When doing the hexagonal diagram experiment, The magnitudes are equal, and the phase difference is 90 degrees. Substituting into the above formula (9) and simplifying it, we can get the following formula (10):

[0139]

[0140] From formula (10), we can see Hysteresis 15 degrees, Hysteresis 135 degrees, Ahead of the times 105 degrees, so the phase relationship of the high-voltage side current can be obtained; combined with Fig.11 The corresponding relationship between the wiring of each phase of the differential protection device can be used to derive the phase relationship of the current of each phase of the differential protection device;

[0141] Therefore, when doing the hexagon diagram experiment, the standard high-voltage side three-phase voltage angle data, high-voltage side three-phase current angle data and low-voltage side two-phase current angle data of the YN / A balancing transformer are as follows:

[0142] High voltage side three-phase voltage angle data: High voltage side three-phase current angle data: Two-phase current angle data on the low voltage side:

[0143] The derivation process of the standard hexagonal diagram vector diagram of SCOTT connection transformer is as follows Fig.12 As shown in the figure, the differential equation of the SCOTT connection transformer is derived based on the transformer external fault being positive polarity, where the phase currents of the SCOTT connection transformer are as follows: Fig.13 As shown by Fig.13 The three-phase voltage phase sequence of the high-voltage side of the transformer can be obtained; combined with the three-phase voltage phase sequence of the high-voltage side of the transformer and the transformer principle (when the three-phase voltage on the high-voltage side is symmetrical, the two-phase voltage on the low-voltage side is also symmetrical, that is, equal in magnitude, with a phase difference of 90 degrees, and and Same phase, and In phase), the voltage phase sequence of the low-voltage side of the transformer can be derived; when the low-voltage side bus is short-circuited and grounded, the phase difference between the bus voltage and current is the short-circuit impedance angle. If a metallic short circuit is made, the short-circuit impedance angle can be considered to be 0. Therefore, the low-voltage side current phase can be derived by combining the low-voltage side voltage phase of the transformer; Fig.13 The current flow direction in and the principle of magnetic potential balance can be obtained as formula (11):

[0144]

[0145] The current relationship between the high-voltage and low-voltage windings of the SCOTT connection transformer can be obtained from equation (11), as shown in equation (12):

[0146]

[0147] When doing the hexagonal diagram experiment, The magnitudes are equal, and the phase difference is 90 degrees. Substituting into the above formula (12) and simplifying it, we can get the following formula (13):

[0148]

[0149] Combining the current phase of the transformer low voltage side and the above formula (13), the current phase of the transformer high voltage side can be obtained; Fig.13 Corresponding relationship between the phase connections of the differential protection device (high voltage side) and Same phase, and Same phase, and In phase; low voltage side and Same phase, and In phase), the phase relationship of each phase current of the differential protection device can be derived;

[0150] Therefore, when doing the hexagon diagram experiment, the standard high-voltage side three-phase voltage angle data, high-voltage side three-phase current angle data and low-voltage side two-phase current angle data of the SCOTT connection transformer are:

[0151] High voltage side three-phase voltage angle data: High voltage side three-phase current angle data: Two-phase current angle data on the low voltage side:

[0152] The derivation process of the standard hexagonal diagram vector diagram of a three-phase V / V0 connection transformer is as follows Fig.14 As shown, the current of each phase of the three-phase V / V0 connection transformer is as follows Fig.15 As shown, it can be seen that the A phase of the transformer high-voltage side is connected to the A phase of the power supply, the B phase is connected to the B phase of the power supply, and the C phase is connected to the C phase of the power supply. The three-phase voltage phase sequence of the high-voltage side of the transformer can be obtained; combined with the three-phase voltage phase sequence of the high-voltage side of the transformer and the transformer principle (i.e. and Same phase, and Same phase, and The phase difference between the two is 60 degrees), and the voltage phase sequence of the low-voltage side of the transformer can be derived; when the low-voltage side bus is short-circuited and grounded, the phase difference between the bus voltage and current is the short-circuit impedance angle. If a metallic short circuit is made, the short-circuit impedance angle can be considered to be 0. Therefore, the current phase of the low-voltage side of the transformer can be derived by combining the voltage phase sequence of the low-voltage side of the transformer; Fig.15 The current flow direction in the , combined with the principle of magnetic potential balance, can be obtained as formula (14):

[0153]

[0154] From formula (14), the current relationship between the high-voltage and low-voltage windings of the three-phase V / V0-connected transformer can be obtained, as shown in formula (15):

[0155]

[0156] Combining the current phase of the transformer low voltage side and the above formula (15), the current phase of the transformer high voltage side can be obtained. Fig.15 Corresponding relationship between current connections of each phase of the differential protection device (high voltage side) and In phase, high voltage side and In phase, high voltage side and In phase; low voltage side and Inverting, and Reverse phase), the phase relationship of each phase current of the differential protection device can be derived; further As a reference, the current of each phase of the differential protection device is rotated 30 degrees clockwise to obtain the standard high-voltage side three-phase voltage angle data, high-voltage side three-phase current angle data and low-voltage side two-phase current angle data of the three-phase V / V0 connection transformer:

[0157] High voltage side three-phase voltage angle data: High voltage side three-phase current angle data: Two-phase current angle data on the low voltage side:

[0158] The derivation process of the standard hexagonal diagram vector diagram of the three-phase V / V6 connection transformer is as follows Fig.16 As shown, the current of each phase of the three-phase V / V6 connection transformer is as follows Fig.17 As shown by Fig.17 The three-phase voltage phase sequence of the transformer high-voltage side can be obtained; combined with the three-phase voltage phase sequence of the transformer high-voltage side and the transformer principle (i.e. and Inverting, and Inverting, and The phase difference between the two is 60 degrees), and the voltage phase sequence of the low-voltage side of the transformer can be derived; when the low-voltage side bus is short-circuited and grounded, the phase difference between the bus voltage and current is the short-circuit impedance angle. If a metallic short circuit is made, the short-circuit impedance angle can be considered to be 180, so the current phase of the low-voltage side of the transformer can be derived by combining the voltage phase sequence of the low-voltage side of the transformer; Fig.17 The current flow direction in the , combined with the principle of magnetic potential balance, can be obtained as formula (16):

[0159]

[0160] From formula (16), the current relationship between the high-voltage and low-voltage windings of the three-phase V / V0-connected transformer can be obtained, as shown in formula (17):

[0161]

[0162] Combining the current phase of the transformer low voltage side and the above formula (17), the current phase of the transformer high voltage side can be obtained. Fig.17 Corresponding relationship between current connections of each phase of the differential protection device (high voltage side) and In phase, high voltage side and In phase, high voltage side and In phase; low voltage side and Inverting, and Reverse phase), the phase relationship of each phase current of the differential protection device can be derived; further As a reference, the current of each phase of the differential protection device is rotated 30 degrees clockwise to obtain the standard high-voltage side three-phase voltage angle data, high-voltage side three-phase current angle data and low-voltage side two-phase current angle data of the three-phase V / V6 connection transformer:

[0163] High voltage side three-phase voltage angle data: High voltage side three-phase current angle data: Two-phase current angle data on the low voltage side: It can be seen that the current phase relationship between the three-phase V / V6 connection transformer and the three-phase V / V0 connection transformer is exactly the same, only the connection polarity of the current mutual on the low-voltage side is different (the difference between the positive and reverse connection of the current mutual).

[0164] The derivation process of the standard hexagonal diagram vector diagram of a single-phase transformer is as follows: Fig.18 As shown, the current of each phase of the single-phase transformer is as follows: Fig.19 As shown, it can be seen that the A phase of the high-voltage side of the transformer is connected to the A phase of the power supply, and the B phase is connected to the B phase of the power supply, and the phase sequence of the two-phase voltage on the high-voltage side of the transformer can be obtained; combined with the two-phase voltage phase sequence on the high-voltage side of the transformer and the principle of the single-phase connection transformer (i.e. and In phase), the voltage phase sequence of the low-voltage side of the transformer can be derived; when the low-voltage side bus is short-circuited and grounded, the phase difference between the bus voltage and current is the short-circuit impedance angle. If a metallic short circuit is made, the short-circuit impedance angle can be considered to be 0. Therefore, the current phase of the low-voltage side can be derived by combining the voltage phase sequence of the low-voltage side of the transformer, and then combined with the characteristics of the single-phase connection transformer (high-voltage side With low pressure side Same phase, and Reverse phase) can be used to obtain the current phase on the high voltage side, and then combined with Fig.19 The current flow direction and corresponding relationship in the differential protection device can be used to obtain the phase relationship of the current in each phase; As a reference, the current of each phase of the differential protection device is rotated 30 degrees clockwise to obtain the standard high-voltage side three-phase voltage angle data, high-voltage side three-phase current angle data and low-voltage side two-phase current angle data of the single-phase connection transformer, respectively:

[0165] Two-phase voltage angle data on the high-voltage side: High voltage side two-phase current angle data: Low voltage side current angle data:

[0166] It should be understood that although Figure 3 , 7 The steps in the flowcharts of , 8, 10, 12, 14, 16, and 18 are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 3 , 7 At least part of the steps in , 8, 10, 12, 14, 16, and 18 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these sub-steps or stages is not necessarily one by one, but can be performed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0167] In one embodiment, a transformer differential protection secondary circuit connection state detection device is provided, the device is applied to the processing circuit in the above-mentioned intelligent hexagonal diagram detection device, and the device includes:

[0168] The data receiving module is used to receive the electrical parameter data transmitted by the substation communication processing equipment; the electrical parameter data is the data generated by the transformer protection measurement and control device connected to the substation communication processing equipment; the electrical parameter data includes the three-phase voltage angle data on the high-voltage side, the three-phase current angle data on the high-voltage side and the two-phase current angle data on the low-voltage side;

[0169] The detection module is used to determine the hexagonal diagram vector diagram according to the electrical parameter data, and output the wiring status detection result based on the hexagonal diagram vector diagram.

[0170] For the specific limitations of the transformer differential protection secondary circuit wiring state detection device, please refer to the limitations of the transformer differential protection secondary circuit wiring state detection method mentioned above, which will not be repeated here. Each module in the above-mentioned transformer differential protection secondary circuit wiring state detection device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0171] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned transformer differential protection secondary circuit connection status detection method are implemented.

[0172] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0173] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0174] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0175] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An intelligent hexagonal image detection device, characterized in that: including power modules and processing circuits connected to each other; The power supply module is used to connect the current transformer on the high-voltage side of the transformer, and is used to connect to the current transformer on the low-voltage side of the transformer through the current transformer on the high-voltage side of the transformer; the power supply module is used to supply power to the current transformer on the high-voltage side of the transformer and the processing circuit; the power supply module is also used to provide a constant voltage source; The processing circuit is used to connect to the substation communication processing equipment and obtain the electrical parameter data generated by the transformer protection and measurement and control device connected to the substation communication processing equipment; the electrical parameter data includes three-phase voltage angle data on the high-voltage side, three-phase current angle data on the high-voltage side and two-phase current angle data on the low-voltage side; the processing circuit is used to determine the hexagonal diagram vector diagram according to the electrical parameter data, and output the wiring status detection result based on the hexagonal diagram vector diagram.

2. The intelligent hexagonal image detection device according to claim 1, characterized in that: The power module includes an AC-AC boost module, a mobile power supply and an AC-DC conversion circuit connected in sequence; The AC-DC conversion circuit is connected to the processing circuit; the AC-AC boost module is used to connect to the current transformer at the high-voltage side of the transformer.

3. The intelligent hexagonal image detection device according to claim 1 or 2, characterized in that: Also includes test terminals and communication equipment; Wherein, one end of the communication device is connected to the processing circuit, and the other end is used to connect to the substation communication processing device, and the communication device is used to enable the processing circuit to communicate with the substation communication processing device; One end of the test terminal is connected to the power module, and the other end is used to connect to the current transformer on the high-voltage side of the transformer.

4. The intelligent hexagonal image detection device according to claim 3, characterized in that: Also included is a display device connected to the processing circuit; The display device is used to display the hexagonal vector diagram and the wiring status detection result.

5. A method for detecting the connection status of a secondary circuit of a transformer differential protection, characterized in that: The method is applied to a processing circuit in an intelligent hexagonal image detection device according to any one of claims 1 to 4, and the method comprises the steps of: Receive the electrical parameter data transmitted by the substation communication processing equipment; the electrical parameter data is data generated by the transformer protection measurement and control device connected to the substation communication processing equipment; the electrical parameter data includes three-phase voltage angle data on the high-voltage side, three-phase current angle data on the high-voltage side and two-phase current angle data on the low-voltage side; A hexagonal vector diagram is determined according to the electrical parameter data, and a wiring status detection result is output based on the hexagonal vector diagram.

6. The transformer differential protection secondary circuit connection state detection method according to claim 5, characterized in that: The step of outputting the wiring status detection result based on the hexagonal vector diagram comprises: Obtain a standard hexagonal diagram vector diagram, compare the hexagonal diagram vector diagram with the standard hexagonal diagram vector diagram, and determine whether the differential protection secondary circuit is correctly connected.

7. The transformer differential protection secondary circuit connection state detection method according to claim 6, characterized in that: The step of obtaining the standard hexagonal vector diagram comprises: The corresponding standard hexagonal vector diagram is obtained according to the connection groups of each type of transformer.

8. The transformer differential protection secondary circuit connection state detection method according to claim 6, characterized in that: The step of obtaining the standard hexagonal vector diagram includes: Obtaining voltage phase data on the high-voltage side of the transformer; determining voltage phase data on the low-voltage side according to the voltage phase data on the high-voltage side; determining current phase data on the high-voltage side based on the voltage phase data on the low-voltage side; The standard hexagonal vector diagram is determined according to the high-voltage side current phase data.

9. A transformer differential protection secondary circuit connection state detection device, characterized in that: The device is applied to a processing circuit in an intelligent hexagonal image detection device according to any one of claims 1 to 4, and the device comprises: A data receiving module, used to receive the electrical parameter data transmitted by the substation communication processing equipment; the electrical parameter data is data generated by the transformer protection measurement and control device connected to the substation communication processing equipment; the electrical parameter data includes high-voltage side three-phase voltage angle data, high-voltage side three-phase current angle data and low-voltage side two-phase current angle data; The detection module is used to determine the hexagonal diagram vector diagram according to the electrical parameter data, and output the wiring status detection result based on the hexagonal diagram vector diagram.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 5 to 8 are implemented.

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