A multi-circuit insulation resistance test method

Abstract

The present application discloses a multi-loop insulation resistance test method, comprising: sequentially numbering the wiring terminals on the wire core interface as 1, 2, 3...n, connecting the wiring terminals with the corresponding numbered wires to be tested in a one-to-one correspondence manner; inserting two test leads of an insulation megger into a first meter pin jack and a second meter pin jack respectively, shaking the insulation megger, and recording the resistance value R1 between the current detection wire groups; this step is performed until only the last wire to be tested is in contact with the only first conductor contact point and the last group resistance value R is recorded. m‑1 ; Compare R1‑R m‑1 Compared with the preset qualified resistance value R0, the wires connected to the single contact slide in the group with a resistance value less than R0 are screened and detected to determine the problematic wire group. The device of the present invention can greatly shorten the detection time and reduce the number of detection personnel, and the detection efficiency can be increased to more than 80%, and there will be no safety hazard of electric shock.

Description

Technical Field

[0001] The present application relates to the technical field of circuit detection devices, in particular to the technical field of insulation performance detection methods for insulation circuits, and specifically to a multi-circuit insulation resistance testing method. Background Art

[0002] With the development of society and economy, there are more and more new construction, renovation and expansion projects of substations. At the same time, the comprehensive transformation of secondary equipment in substations is increasing day by day. The insulation characteristic test of secondary cables in substations is one of the important tasks in the full inspection acceptance regulations of relay protection. In addition, there are many secondary cables reused in the transformation of old stations, so the insulation test of secondary cables is relatively heavy. The power supply circuit, non-electrical protection circuit and secondary circuit of the switch body of the newly built intelligent substation also need insulation testing, and the insulation strength of the secondary cable of the power system should be ≥10MΩ. However, at present, the mechanical megohmmeter or electronic megohmmeter used can only measure the insulation characteristics between two cores or between a single core and the ground at a time, which is inefficient. Summary of the invention

[0003] In order to solve the problem that the mechanical megger used in the prior art to detect the circuit resistance can only detect the two ends of a circuit in a single operation, when there are a large number of insulation circuits to be detected, the actual detection workload is large and the efficiency is very low. In order to more clearly and objectively reflect the high efficiency of the present application in the insulation circuit detection, the actual detection method of the prior art is briefly described first:

[0004] To test the insulation characteristics of an n-core secondary cable, insulation tests between cores and between cores and ground are required. The number of tests required is detailed in the formula

[0005] n×(n-1) / 2+n=n×(n+1) / 2

[0006] For example, the common 220kV main transformer non-electrical secondary cables for non-electrical protection are mostly 14-core cables, which need to be tested 14*(14+1) / 2=105 times. At the same time, during the testing of 14-core cables, it is easy to miss or repeat the test, which affects the work quality and efficiency.

[0007] In addition, the current substation secondary maintenance personnel mostly use electronic megohmmeters to perform secondary cable insulation tests, which are performed by at least two people, one to operate the megohmmeter and one to connect the meter needle to the secondary cable core. When the secondary cable is loose, a third person is also required to help fix the cable. This work exposes three problems: first, it takes up manpower and requires at least two people to perform it; second, there is a risk of electric shock, as the test voltage of an ordinary megohmmeter can reach up to 2500V; third, it is inefficient and must be tested one by one. When there are many cores, omissions or repeated measurements often occur. Therefore, how to safely and efficiently implement insulation testing of multi-core secondary cables has become a major problem that plagues maintenance personnel.

[0008] To solve the above problems, two aspects can be considered. One is to improve the insulation test principle and increase the insulation strength test speed between every two cores. The second is to change the insulation test method between multiple cores and increase the overall insulation strength test speed. Regarding the first point, at present, the insulation megger is relatively mature, and the technical principles are similar. To make improvements in this regard, the investment is large and the return is small. Therefore, this application mainly improves the insulation test method.

[0009] In order to achieve the above purpose, the present application provides a multi-circuit insulation resistance test method and test method, which is used to change the many problems of traditional testing, such as long number of times, complex process, and large number of personnel. Specifically, the technical solution adopted by the present application is:

[0010] A multi-loop insulation resistance testing method is implemented by using the resistance testing adapter provided by the present application, wherein the resistance testing adapter specifically includes a base as a main body, a guide rail and a wire feed mechanism for connecting multiple wires to be tested are installed on the base, a multi-contact slide and a single-contact slide insulated from each other are slidably installed on the guide rail, a plurality of first conductor contacts arranged in a straight line and electrically connected to each other through a conductive seat are evenly spaced on the multi-contact slide near the wire feed mechanism, a second conductor contact is provided on the single-contact slide near the wire feed mechanism, a plurality of spring copper contacts respectively connected to the wires to be tested are evenly spaced L on the wire feed mechanism, the spring copper contacts respectively correspond to the first conductor contacts and the second conductor contacts, and the minimum spacing L between the second conductor contacts and the adjacent first conductor contacts is equal to the spacing L between any two adjacent first conductor contacts; a first meter pin jack respectively electrically connected to any one of the first conductor contacts is provided on the multi-contact slide, and a second meter pin jack electrically connected to the second conductor contact is provided on the single-contact slide.

[0011] In order to facilitate wiring, preferably, the line entry mechanism is provided with a wire core interface for quick disassembly and assembly of the wire to be detected, and the wire core interface includes a plurality of wiring terminals, and the wiring terminals correspond one to one with the spring copper contacts, and one wiring terminal is connected to one wire to be detected.

[0012] In order to facilitate the installation of the wire to be tested, preferably, the terminal block includes two pairs of staggered tongues, any pair of tongues are relatively installed in a clamping structure, and any tongue is made of copper sheet and has a straight portion and a curled portion located in the clamping section. The advantage of using a tongue structure that is arranged in pairs and clamped is that the detected wire core can be directly inserted between the tongues, and the arc-shaped curled portion can facilitate the plugging and unplugging of the wire core. At the same time, the two pairs of tongues arranged in a clamping structure can always maintain good contact with the wire core; the use of two pairs of staggered tongues can further improve the stability of the contact between the wire core and the tongue, which can prevent the wire core from loosening and improve the conductivity, providing good conditions for accurate testing.

[0013] In order to improve the conductive stability, preferably, the spring copper contact includes a hollow contact cap with a spherical shape, a spring is arranged inside the hollow contact cap, and the spring is electrically connected to the wire core interface through the cable. Since the spring always has an uninterrupted outward extension force after being in a compressed state, the hollow contact cap and the cable always maintain good contact. At the same time, under the action of the spring, the hollow contact cap can also maintain good contact with the first conductor contact and the second conductor contact.

[0014] In order to maintain contact and conductive stability, and to improve the convenience of line change / group testing, preferably, the first conductor contact and the second conductor contact are both set with a concave spherical groove that is compatible with the hollow contact cap. Since it is necessary to complete the resistance test between the wires to be tested, when the second group of tests are performed after completing one group, the wire to be tested as the main test needs to be changed. The specific operation is to slide the multi-contact slide and the single-contact slide by one unit respectively, and the spacing L1 between two adjacent first conductor contacts; the advantage of using the concave spherical groove setting that is compatible with the hollow contact cap is that when sliding the multi-contact slide or the single-contact slide, due to the effect of the hollow contact cap, the first conductor contact and / or the second conductor contact set by the concave spherical groove can be adaptively accommodated, and in the specific operation, there is a sense of automatic positioning suction, so that no matter how the multi-contact slide or the single-contact slide is slid, the actual sliding distance will always be an integer multiple of the spacing L1, and the hollow contact cap can also maintain good contact with the first conductor contact and the second conductor contact.

[0015] In order to further improve the convenience of line change and provide a power-off operation for line change to avoid dangers such as electric shock caused by abnormal short circuit in the loop during testing, preferably, a first insulating contact of the same size as the first conductor contact is also provided at the midpoint between two adjacent first conductor contacts on the multi-contact slide; and a second insulating contact is provided at the midpoint between the second conductor contact and the adjacent first conductor contact on the single-contact slide. When the above arrangement is used on the sliding multi-contact slide and / or the single-contact slide, the sliding unit distance will be reduced from the original L1 to L1 / 2, and the connection state between the wire to be tested and the first meter pin jack and / or the second meter pin jack will be connected / disconnected alternately as the multi-contact slide and / or the single-contact slide slides on the guide rail.

[0016] The following is a detailed description of the steps of the multi-loop insulation resistance test method of the present invention, which is implemented based on the above-mentioned resistance test adapter and specifically includes the following steps:

[0017] Step STP100, the wiring terminals on the wire core interface are sequentially numbered as 1, 2, 3, ... n, and at the same time, the wires to be detected are numbered one by one as 1, 2, 3, ... m, where n ≥ m;

[0018] Step STP200, connecting the wiring terminals to the wires to be tested with corresponding numbers in a one-to-one correspondence manner;

[0019] Step STP300, insert two test leads of the insulation megohmmeter into the first test pin jack and the second test pin jack respectively, slide the single-contact slide on the guide rail so that the second conductor contact is electrically connected to the wire to be detected numbered 1, and slide the multi-contact slide so that the wires to be detected numbered 2, 3...m are all electrically connected to the first conductor contact;

[0020] Step STP400, shaking the insulation megohmmeter to record the resistance value R1 between the current detection wire groups;

[0021] Step STP500, slide the multi-contact slide and the single-contact slide by a distance L1, repeat step STP400 and record the resistance value R2 between the current detection wire groups; repeat this step until only the last wire to be detected is in contact with the only first conductor contact and record the last group resistance value R m-1 ;

[0022] Step STP600, compare R1-R m-1 Compared with the preset qualified resistance value R0, the wires connected to the single-contact slide in the group with resistance values ​​less than R0 are screened and detected to determine the problematic wire group.

[0023] Beneficial effects:

[0024] (1) The use of the device of the present invention can greatly shorten the detection time and reduce the number of detection personnel, and the detection efficiency can be increased to more than 80%.

[0025] (2) The slide design scheme is adopted to avoid missed detection problems and improve work quality. It has a simple structure, easy operation and excellent device performance.

[0026] (3) The plug-in connection method can quickly install and disassemble the detection parts, improve the safety of insulation testing work, have a simple structure, low cost of results conversion, and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 It is a structural axonometric drawing of this application.

[0029] Figure 2 It is a schematic diagram of the internal structure of the incoming line mechanism of this application.

[0030] Figure 3 yes Figure 2 Enlarged view of the structure of area A in the middle.

[0031] Figure 4 It is a top view of the structure of this application.

[0032] Figure 5 yes Figure 4 Full section view with center cut symbol BB.

[0033] Figure 6 yes Figure 5 Enlarged view of the structure of the middle C area.

[0034] In the figure: 1-base; 2-guide rail; 3-core interface; 31-tongue 31; 311-curled portion 311; 312-straight portion 312; 4-wire entry mechanism; 5-wire arrangement; 6-spring 62 copper contact; 61-hollow contact cap 61; 62-spring 62; 7-conductive seat; 8-first conductor contact; 9-first insulating contact; 10-multi-contact slide; 11-single contact slide; 12-second conductor contact; 13-second insulating contact; 14-first meter pin socket; 15-second meter pin socket. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Embodiment 1:

[0042] In conjunction with the instruction manual Figure 1-Figure 4 As shown, this embodiment provides a multi-loop insulation resistance test method, including a base 1 as a main body, a guide rail 2 and a wire feed mechanism 4 for connecting multiple wires to be tested are installed on the base 1, and a multi-contact slide 10 and a single-contact slide 11 insulated from each other are slidably installed on the guide rail 2, and a plurality of first conductor contacts 8 arranged in a straight line and electrically connected to each other through a conductive seat 7 are evenly spaced on the multi-contact slide 10 near the side of the wire feed mechanism 4, and a second conductor contact 12 is provided on the side of the single-contact slide 11 near the side of the wire feed mechanism 4, and the wire feed mechanism 4 has a plurality of first conductor contacts 8 evenly spaced from each other through a conductive seat 7. 1 is provided with a plurality of spring 62 copper contacts 6 respectively connected with the wires to be detected, the spring 62 copper contacts 6 respectively correspond to the first conductor contact 8 and the second conductor contact 12, the minimum spacing L2 between the second conductor contact 12 and the adjacent first conductor contact 8 is equal to the spacing L1 between any two adjacent first conductor contacts 8; the multi-contact slide 10 is provided with a first meter pin jack 14 respectively electrically connected with any one of the first conductor contacts 8, and the single-contact slide 11 is provided with a second meter pin jack 15 electrically connected with the second conductor contact 12.

[0043] Working principle:

[0044] The wire entry mechanism 4 is connected to the wires to be tested respectively, the first needle jack 14 and the second needle jack 15 are connected to the test leads of the insulation megger for resistance testing respectively, and the grouping setting of the wires to be tested is changed by sliding the multi-contact slide 10 and the single-contact slide 11 on the guide rail 2 to realize group detection between different wires to be tested. Based on the above structural setting, this embodiment takes 20 wires to be tested as an example to further illustrate the high efficiency of this embodiment compared with the prior art of two-by-two detection.

[0045] Number of inspections in the prior art: According to the calculation formula for pairwise inspection, the number of inspections required for 20 wire cores is 20*20+1 / 2=210 times.

[0046] The number of times and principles detected in this embodiment are described as follows:

[0047] Using one core to measure with other cores at the same time replaces the multiple measurements of one core with other cores one by one. For a 20-core cable, the test method is: number the cores as 1, 2, 3, 4, ..., 20, first use the core numbered 1 to pair with the cores numbered 2 to 20 for insulation testing, then use the core numbered 2 to pair with the cores numbered 3 to 20 for insulation testing, then use the core numbered 3 to pair with the cores numbered 4 to 20 for insulation testing, and so on, until the core numbered 19 is paired with the core numbered 20 for insulation testing between cores, and then all 20 cores are tested once to the ground, and the number of tests is (20-1) + 1 = 20 times. For example, for a 20-core cable, the method of pairing 1 with 2 to 20, 2 with 3 to 20, 3 with 4 to 20, ..., 19 with 20 is adopted, and at least 20 insulation tests are required to complete the original 210 single test steps, which greatly saves the detection time. At the same time, in this embodiment, the inspector only needs to connect the wire to be inspected once, without manual wire replacement and contact with the wire core, and there is no risk of electric shock. The wire replacement / grouping is performed in a sliding manner, and there will be no manual missed inspection. The wire replacement / grouping operation is convenient and fast, and the contact is reliable. Non-detection paths can be made of insulating materials, which is safer to use.

[0048] The key point of multi-core cable insulation test is to test the insulation performance between all the cores and between the cores and the ground. In the secondary maintenance of substation, according to the regulations, the circuit insulation resistance is greater than or equal to 10 megohms. When measuring the resistance of multiple circuits at the same time, the resistance characteristics show the phenomenon of "higher but not lower". That is, when the resistance to ground of 1 megohm and 100 ohms is connected together to measure the resistance to ground, the test result will be close to 100 ohms. The calculation process is as follows: (10 6 ×10 2 ) / (10 6 +10 2 )≈99.99.

[0049] Embodiment 2:

[0050] Based on the structure and principle of embodiment 1, in order to facilitate wiring, this embodiment further optimizes the structure. Specifically, Figure 1-Figure 6 As shown, the line entry mechanism 4 is provided with a wire core interface 3 for quickly disassembling and assembling the wire to be detected, and the wire core interface 3 includes a plurality of wiring terminals, and the wiring terminals correspond one to one with the spring 62 copper contacts 6, and one wiring terminal is connected to one wire to be detected.

[0051] In order to facilitate the installation of the wire to be tested, the terminal block includes two pairs of staggered tongues 31, any pair of tongues 31 are relatively installed in a clamping structure, and any tongue 31 is made of copper sheet and has a straight portion 312 and a curled portion 311 located in the clamping section. The advantage of using a tongue 31 structure that is arranged in pairs and clamped is that the detected wire core can be directly inserted between the tongues 31, and the arc-shaped curled portion 311 can be arranged to facilitate the plugging and unplugging of the wire core. At the same time, the two pairs of tongues 31 in a clamping structure can always maintain good contact with the wire core; the use of two pairs of staggered tongues 31 can further improve the stability of the contact between the wire core and the tongue 31, which can prevent the wire core from loosening and improve the conductivity, providing good conditions for accurate testing.

[0052] In order to improve the conductive stability, the spring 62 copper contact 6 includes a spherical hollow contact cap 61, in which a spring 62 is arranged, and the spring 62 is electrically connected to the wire core interface 3 through the flat cable 5. Since the spring 62 always has an uninterrupted outward extension force after being in a compressed state, the hollow contact cap 61 and the flat cable 5 always maintain good contact. At the same time, under the action of the spring 62, the hollow contact cap 61 can also maintain good contact with the first conductor contact 8 and the second conductor contact 12.

[0053] In order to improve the convenience of line change / grouping testing while maintaining contact and conductive stability, in this embodiment, the first conductor contact 8 and the second conductor contact 12 are both arranged with a concave spherical groove adapted to the hollow contact cap 61 . Since it is necessary to complete the resistance test between the wires to be tested, when the second group of tests is carried out after completing one group, it is necessary to change the wire to be tested as the main test. The specific operation is to slide the multi-contact slide 10 and the single-contact slide 11 by one unit respectively, and the spacing L1 between two adjacent first conductor contacts 8; the advantage of using the concave spherical groove setting adapted to the hollow contact cap 61 is that when sliding the multi-contact slide 10 or the single-contact slide 11, due to the action of the hollow contact cap 61, the first conductor contact 8 and / or the second conductor contact 12 set by the concave spherical groove can be adaptively accommodated, and in the specific operation, there is a sense of automatic positioning suction, so that no matter how the multi-contact slide 10 or the single-contact slide 11 is slid, the actual sliding distance will always be an integer multiple of the spacing L1, and the hollow contact cap 61 can also maintain good contact with the first conductor contact 8 and the second conductor contact 12.

[0054] In order to further improve the convenience of line change and provide a power-off operation for line change to avoid dangers such as electric shock caused by abnormal short circuit during the test of the circuit, a first insulating contact 9 of the same size as the first conductor contact 8 is also provided at the midpoint between two adjacent first conductor contacts 8 on the multi-contact slide 10; a second insulating contact 13 is provided at the midpoint between the second conductor contact 12 and the adjacent first conductor contact 8 on the single-contact slide 11. When the above arrangement is used to slide the multi-contact slide 10 and / or the single-contact slide 11, the sliding unit distance will be reduced from the original L1 to L1 / 2, and the connection state between the wire to be tested and the first meter pin jack 14 and / or the second meter pin jack 15 will be connected / disconnected alternately as the multi-contact slide 10 and / or the single-contact slide 11 slides on the guide rail 2.

[0055] Embodiment 3:

[0056] This embodiment provides a multi-loop insulation resistance test method, which is implemented based on the resistance test adapter of the above embodiment 2 and specifically includes the following steps:

[0057] Step STP100, the wiring terminals on the wire core interface 3 are sequentially numbered as 1, 2, 3, ... n, and at the same time, the wires to be detected are numbered one by one as 1, 2, 3, ... m, where n ≥ m;

[0058] Step STP200, connecting the wiring terminals to the wires to be tested with corresponding numbers in a one-to-one correspondence manner;

[0059] Step STP300, insert two test leads of the insulation megohmmeter into the first test pin jack 14 and the second test pin jack 15 respectively, slide the single-contact slide 11 on the guide rail 2, so that the second conductor contact 12 is electrically connected to the wire to be detected numbered 1, and slide the multi-contact slide 10 so that the wires to be detected numbered 2, 3...m are all electrically connected to the first conductor contact 8;

[0060] Step STP400, shaking the insulation megohmmeter to record the resistance value R1 between the current detection wire groups;

[0061] Step STP500, slide the multi-contact slide 10 and the single-contact slide 11 by a distance L1, repeat step STP400 and record the resistance value R2 between the current detection wire groups; repeat this step until only the last wire to be detected is in contact with the only first conductor contact 8 and record the last group resistance value R m-1 ;

[0062] Step STP600, compare R1-R m-1 Compared with the preset qualified resistance value R0, the wires connected to the single-contact slide 11 in the group with a resistance value less than R0 are screened and detected to determine the problematic wire group.

[0063] The resistance test adapter and the test method provided in this embodiment are used to perform insulation resistance tests on the secondary cables of different substations and record the actual test time and the number of participants. At the same time, another group of staff uses the existing technology to perform two-by-two tests and record the time and the number of participants to compare and obtain the content shown in Table 1 below, which is as follows:

[0064]

[0065] Table 1: Comparison of time consumption and efficiency between this embodiment and the prior art

[0066] According to the principle of low insulation strength, a new detection method is proposed, which changes the original one-to-one test to one-to-many test. For example, for an n-core cable, according to the requirement: the insulation strength between cores and between cores and ground is ≥10MΩ, the original method needs to test n*(n-2) / 2+n=n*(n+1) / 2 times. The new method uses a physical structure to achieve a 1-to-n-1 test, and the minimum number of tests required to complete the insulation performance test is (n-1)+1=n times.

[0067] (1) The device and method of this embodiment can greatly shorten the detection time and reduce the number of detection personnel.

[0068] (2) The step-by-step slide design is adopted to avoid missed detection problems and improve work quality. The structure is simple, the operation is convenient, and the device performance is excellent.

[0069] (3) The plug-in connection method can quickly install and disassemble the detection parts, improving the safety of insulation testing work.

[0070] (4) The structure is simple, the cost of converting results is low, and it has good economic benefits.

[0071] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-circuit insulation resistance test method, characterized in that: The invention is realized by using a resistance test adapter, the resistance test adapter comprising a base (1) as a main body, a guide rail (2) and a wire feed mechanism (4) for connecting a plurality of wires to be tested are installed on the base (1), a multi-contact slide (10) and a single-contact slide (11) insulated from each other are slidably installed on the guide rail (2), a plurality of first conductor contacts (8) arranged in a straight line and electrically connected to each other through a conductive seat (7) are evenly spaced on the side of the multi-contact slide (10) close to the wire feed mechanism (4), a second conductor contact (12) is arranged on the side of the single-contact slide (11) close to the wire feed mechanism (4), a plurality of spring (62) copper contacts (6) respectively connected to the wires to be tested are evenly spaced on the wire feed mechanism (4), the spring (62) The copper contact (6) corresponds to the first conductor contact (8) and the second conductor contact (12) respectively, and the minimum spacing L2 between the second conductor contact (12) and the adjacent first conductor contact (8) is equal to the spacing L1 between any two adjacent first conductor contacts (8); the multi-contact slide (10) is provided with a first meter pin jack (14) electrically connected to any one of the first conductor contacts (8), the single-contact slide (11) is provided with a second meter pin jack (15) electrically connected to the second conductor contact (12), and the wire entry mechanism (4) is provided with a wire core interface (3) for quickly disassembling and assembling the wire to be detected, the wire core interface (3) comprising a plurality of wiring terminals, and the wiring terminals correspond one-to-one to the spring (62) copper contact (6); The test method specifically includes the following steps: Step STP100, sequentially numbering the wiring terminals on the wire core interface (3) as 1, 2, 3, ... n, and at the same time, numbering the wires to be detected as 1, 2, 3, ... m, wherein n≥m; Step STP200, connecting the wiring terminals to the wires to be tested with corresponding numbers in a one-to-one correspondence manner; Step STP300, inserting two test leads of the insulation megohmmeter into the first test pin jack (14) and the second test pin jack (15) respectively, sliding the single-contact slide (11) on the guide rail (2) so that the second conductor contact (12) is electrically connected to the wire to be detected numbered 1, and sliding the multi-contact slide (10) so that the wires to be detected numbered 2, 3, ..., m are all electrically connected to the first conductor contact (8); Step STP400, shaking the insulation megohmmeter to record the resistance value R1 between the current detection wire groups; Step STP500, slide the multi-contact slide (10) and the single-contact slide (11) by a distance L1, repeat step STP400 and record the resistance value R2 between the current detection wire groups; repeat this step until only the last wire to be detected is in contact with the only first conductor contact (8) and record the last group resistance value R m-1 ; Step STP600, compare R1-R m-1 Compared with the preset qualified resistance value R0, the wires connected to the single-contact slide table (11) in the group with resistance values ​​less than R0 are screened and detected to determine the problematic wire group.

2. A multi-loop insulation resistance testing method according to claim 1, characterized in that: The connection terminal comprises two pairs of staggered tongues (31), each pair of tongues (31) being relatively installed to form a clamping structure, each tongue (31) being made of copper sheet and having a straight portion (312) and a curled portion (311) located in the clamping section.

3. A multi-circuit insulation resistance testing method according to any one of claims 1-2, characterized in that: The spring (62) copper contact (6) comprises a hollow contact cap (61) having a spherical shape, a spring (62) is arranged inside the hollow contact cap (61), and the spring (62) is electrically connected to the wire core interface (3) through a wiring arrangement (5).

4. A multi-circuit insulation resistance testing method according to claim 3, characterized in that: The first conductor contact (8) and the second conductor contact (12) are both arranged in a concave spherical groove adapted to the hollow contact cap (61).

5. A multi-loop insulation resistance testing method according to claim 4, characterized in that: A first insulating contact (9) having the same size as the first conductor contact (8) is also provided at a midpoint between two adjacent first conductor contacts (8) on the multi-contact slide (10); and a second insulating contact (13) is provided at a midpoint between a second conductor contact (12) and an adjacent first conductor contact (8) on the single-contact slide (11).

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