CN106706970A - Transformer direct-current resistance test connection switching box - Google Patents

Abstract

Translated fromChinese

本发明公开了一种变压器直流电阻试验接线转换盒，涉及变压器试验设备技术领域，包括设备区、仪器区和操作区；设备区设有与变压器同名接线柱相连接的电流、电压接线端子，仪器区设有与实验仪器同名接线端子相连接的电流、电压接线端子，操作区设有转换开关，设备区和仪器区内的电流、电压接线端子，在转换盒内部，通过转换开关控制的试验电路与操作区电连接。本发明可解决传统试验时多次攀登变压器换线接线的问题，利用所述转换盒，可在变压器接线柱处一次性完成接线，并可通过转换开关，实现变压器直流电阻试验接线的自动切换，从而将高空接线换线工作转移至地面进行，避免多次登高接线换线，提高了工作效率，消除了安全隐患。

The invention discloses a DC resistance test connection conversion box for a transformer, relates to the technical field of transformer test equipment, and includes an equipment area, an instrument area and an operation area; The area is equipped with current and voltage terminals connected to the terminals of the same name of the experimental instrument, the operation area is equipped with a transfer switch, the current and voltage terminals in the equipment area and instrument area are inside the transfer box, and the test circuit controlled by the transfer switch Electrically connected to the operating area. The invention can solve the problem of climbing the transformer multiple times to change the wiring during the traditional test. Using the conversion box, the wiring can be completed at the transformer terminal at one time, and the automatic switching of the DC resistance test wiring of the transformer can be realized through the conversion switch. In this way, the high-altitude wiring change work is transferred to the ground, which avoids multiple times of high-altitude wiring change, improves work efficiency, and eliminates potential safety hazards.

Description

DC Resistance Test of Transformer wiring boxcar

Technical field

Turn the invention belongs to apparatus for testing transformer technical field, more particularly to a kind of DC Resistance Test of Transformer wiringChange box.

Background technology

Transformer is a kind of main electrical equipment in power system, it is regularly tested and maintenance is to become electric-examinationOne of groundwork repaiied, the D.C. resistance of sleeve pipe is connected especially by measuring transformer winding, can be checked inside windingThe welding quality of terminal, the welding quality of lead and winding joint, voltage tap switch each tap position and sleeve pipeWhether contact is good, whether correct, transformer current carrying part whether there is open circuit, loose contact and winding whether there is for parallel branch connectionShort trouble etc..

When D.C. resistance experiment is carried out to transformer using conventional method, testing crew need to dress safety belt and climb up transformationDevice, seat belt hanger is hung on firm framework, then carries out test connection to high-pressure side A phase windings；Treat this D.C. resistanceMeasurement end-of-job, testing crew repeats aforesaid operations, and high-pressure side B, C phase and low-pressure side A, B, C phase windings and straight are measured successivelyLeakage resistance.During whole operation, testing crew need to carry out wiring, thread-changing by least 6 times climbing transformers repeatedly, expense of not only taking a lot of workWhen, and there is potential safety hazard of falling and get an electric shock etc..

The content of the invention

The technical problem to be solved in the present invention is directed to above-mentioned the deficiencies in the prior art, there is provided a kind of DCR of TransformerTest connection boxcar, solve traditional transformer D.C. resistance test process in, need to climb repeatedly transformer carry out high-altitude wiring,The problems such as thread replacing work.By using DC Resistance Test of Transformer wiring boxcar, high-altitude wiring, thread replacing work can be shiftedCarried out to ground, only climbing a transformer can complete whole wiring, reduce the number of times and wind of testing crew work high above the groundDanger；And can realize the automatic switchover of high and low pressure side three-phase windings test connection by change-over switch, it is to avoid repeatedly wiring,Thread replacing work, effectively shortens test period, improves operating efficiency.

In order to solve the above technical problems, the technical solution used in the present invention is：

There is provided a kind of DC Resistance Test of Transformer wiring boxcar, it is characterised in that the boxcar front is test rectanglePanel, including：Battery limits, instrument area and operating space；

Electric current, the voltage wiring terminal being connected with transformer binding post of the same name are provided with the battery limits, for transformerBinding post connection of the same name；

Electric current, the voltage wiring terminal being connected with laboratory apparatus binding post of the same name are provided with the instrument area, for examinationTest instrument binding post connection of the same name；

Change-over switch is provided with the operating space, for realizing gear selection and the switching of hookup；

Electric current, voltage wiring terminal in the battery limits and instrument area, in the boxcar body interior, by the conversionThe hookup for switching control is electrically connected with the operating space.

Preferably, boxcar also includes termination, and the termination includes cable, hold assembly and plug-in portionPart, the hold assembly is connected with transformer binding post, electric current, voltage link in the plug-in part and the battery limitsTerminal is connected, and the hold assembly is fixedly connected with the plug-in part by the cable.

Preferably, hold assembly includes two Gripper bodies, installs the rotation connecting shaft for fixing two Gripper bodies, the company of rotationElastic component is coated with inside spindle, the chuck leading inside is provided with sawtooth, and chuck Handheld Division is provided with insulating sheath.

Preferably, it is provided with I in battery limits_A、I_B、I_C、I₀、I_a、I_b、I_cSeven battery limits current wiring terminals and U_A、U_B、U_C、U₀、U_a、U_b、U_cSeven battery limits voltage wiring terminals, the electric current, voltage wiring terminal are same by termination and transformerName binding post connection.

Preferably ,+I ,-I instrument area's current wiring terminal and+U ,-U instrument area voltage wiring terminal are provided with instrument area,The electric current, voltage wiring terminal are by test apparatus itself supporting experiment cable and test apparatus binding post of the same nameCorrespondence connection.

Preferably, change-over switch includes high-pressure side change-over switch and low-pressure side change-over switch, the high-pressure side change-over switchIncluding OFF grades, R_AOShelves, R_BOShelves and R_COShelves, cut-out for Control experiment circuit and realize high voltage side of transformer D.C. resistanceMeasurement, the low-pressure side change-over switch includes OFF grades, R_abShelves, R_bcShelves and R_caShelves, cut-out and reality for Control experiment circuitThe measurement of the alternate resistance of existing step down side.

Preferably, instrument area current wiring terminal+I inside the boxcar respectively by switching S1, S2, S3, S5, S6With battery limits current wiring terminals I_A、I_B、I_C、I_a、I_bCorrespondence electrical connection, the instrument area current wiring terminal-I is in the conversionRespectively by switching S4, S7, S8 and battery limits current wiring terminals I inside box_o、I_b、I_cCorrespondence electrical connection, the instrument area electricityCrimping line terminals+U is inside the boxcar respectively by switching S1 ', S2 ', S3 ', S5 ', S6 ' and battery limits voltage terminalSub- U_A、U_B、U_C、U_a、U_bCorrespondence electrical connection, the instrument area voltage wiring terminal-U is inside the boxcar respectively by switchS4 ', S7 ', S8 ' and battery limits voltage wiring terminals U_o、U_b、U_cCorrespondence electrical connection.

Preferably, boxcar box body is hollow cuboid, and six faces are isolation material.

It is using the beneficial effect produced by above-mentioned technical proposal：In traditional transformer D.C. resistance test process, behaviourMake personnel and need to repeatedly climb transformer to carry out high-altitude wiring, thread replacing work, not only time-consuming, efficiency is low, and fall and get an electric shockRisk it is high, by use DC Resistance Test of Transformer wiring boxcar, high-altitude wiring, thread replacing work can be transferred to groundCarry out, reduce the number of times and security risk of testing crew work high above the ground, it is to avoid wiring, thread replacing work repeatedly, effectively shortenTest period, improves operating efficiency, practical.

Brief description of the drawings

Fig. 1 is boxcar internal circuit connection diagram of the present invention；

Fig. 2 is boxcar front view of the present invention；

Fig. 3 is termination hold assembly structural representation of the present invention；

Fig. 4 is termination plug-in modular construction schematic diagram of the present invention.

In figure：1. battery limits；2. instrument area；3. operating space；4. battery limits current wiring terminal；5. battery limits voltage linkTerminal；6. high-pressure side change-over switch；7. low-pressure side change-over switch；8. instrument area current wiring terminal；9. instrument area voltage linkTerminal；10. chuck；11. rotate connecting shaft；12. elastic components；13. sawtooth；14. insulating sheaths；15. cables；16. plugs.

Specific embodiment

The present invention is further detailed explanation with reference to the accompanying drawings and detailed description, but protection model of the inventionEnclose be not limited to it is as described below.

With reference to Fig. 1-Fig. 4, details are as follows：

As shown in figure 1, a kind of DC Resistance Test of Transformer wiring boxcar, it is characterised in that the boxcar front is squareShape test panel, including：Battery limits 1, instrument area 2 and operating space 3；

Electric current, the voltage wiring terminal being connected with transformer binding post of the same name are provided with the battery limits 1, for transformerBinding post connection of the same name；

Electric current, the voltage wiring terminal being connected with laboratory apparatus binding post of the same name are provided with the instrument area 2, for examinationTest instrument binding post connection of the same name；

Change-over switch is provided with the operating space 3, for realizing gear selection and the switching of hookup；

Electric current, voltage wiring terminal in the battery limits 1 and instrument area 2, in the boxcar body interior, by described turnThe hookup for changing switch control is electrically connected with the operating space.

Specifically, as shown in Figure 3 and Figure 4, boxcar also includes termination, and the termination includes cable 15, folderPart and plug-in part are held, the hold assembly is connected with transformer binding post, the plug-in part and the battery limitsInterior electric current, voltage wiring terminal connection, the hold assembly is fixedly connected with the plug-in part by the cable 15；The hold assembly includes two bodies of chuck 10, installs the rotation connecting shaft 11 for fixing the body of two chuck 10, and the present invention is implementedExample is installed and fixes the body of two chuck 10 by taking rotatable bolt as an example, to be rotated and be coated with elastic component 12 inside connecting shaft 11, such as Fig. 3Shown, by taking spring as an example, the leading inside of the chuck 10 is provided with sawtooth 13 to the embodiment of the present invention, and the Handheld Division of chuck 10 is provided with insulationSheath 14.During test wiring, tester leads to the partial insertion battery limits electric current of 15 plug of cable 16, voltage wiring terminalIn hole, be tightly clipped in the part of 10 sawtooth of chuck 13 at the sleeve pipe of change electrical equipment binding post top by the part of hand-held insulating sheath 14, so thatRealize the firm connection of boxcar and transformer binding post of the same name.

Beneficial effect using above-mentioned technical proposal is that termination is connected with boxcar using plug-in structure, operationSimple and convenient, chuck leading inside is set to zigzag, is capable of achieving the stabilization of termination and transformer binding post, is firmly connected,Chuck portion of the handle is provided with insulating sheath, reduces the risk of tester's electric shock, effectively eliminates potential safety hazard.

Specifically, as shown in Fig. 2 being provided with I in battery limits 1_A、I_B、I_C、I₀、I_a、I_b、I_cSeven battery limits current terminals4 and U of son_A、U_B、U_C、U₀、U_a、U_b、U_cSeven battery limits voltage wiring terminals 5, the electric current, voltage wiring terminal pass through wiringDevice is connected with transformer binding post of the same name；+ I ,-I instrument area current wiring terminal 8 and+U ,-U instrument area are provided with instrument area 2Voltage wiring terminal 9, the electric current, voltage wiring terminal are by test apparatus itself supporting experiment cable and the test instrumentDevice binding post correspondence of the same name is connected.In process of the test, by each binding post in battery limits 1 and transformer to be measured binding post of the same nameConnected one to one by termination, by each binding post in instrument area 2 with test apparatus binding post of the same name by experimentThe experiment cable of instrument itself connects one to one.

Beneficial effect using above-mentioned technical proposal is, by setting on conversion box body and a pair of transformer to be measuredElectric current of the same name, the voltage wiring terminal that should be connected, can disposably complete all wiring work, process of the test, without climbing change againDepressor carries out wiring, thread replacing work manually, reduces the testing time, improves operating efficiency, and avoid may be due to tearing open, connecingTest error and electric shock risk that line is caused.

Specifically, as shown in Fig. 2 change-over switch includes high-pressure side change-over switch 6 and low-pressure side change-over switch 7, the heightPressure side change-over switch 6 includes OFF grades, R_AOShelves, R_BOShelves and R_COShelves, cut-out for Control experiment circuit and realize that transformer is highThe measurement of side D.C. resistance is pressed, the low-pressure side change-over switch 7 includes OFF grades, R_abShelves, R_bcShelves and R_caShelves, for Control experimentThe cut-out of circuit and realize the measurement of the alternate resistance of step down side.In process of the test, rotary switch to corresponding gear is turned,The automatic switchover of hookup can be realized in boxcar tray interior, the winding to be measured indicated with gear is accessed into experiment electricityRoad, completes the measurement of testing resistance resistance.

Beneficial effect using above-mentioned technical proposal is, in process of the test, it is not necessary to artificial thread-changing, wiring again, by conversionSwitch can realize the automatic switchover of hookup in boxcar tray interior, effectively evade the danger of testing crew high-altitude thread-changingDanger, it is simple to operate, the operating time is saved, improve operating efficiency.

Specifically, the current wiring terminal+I of instrument area 2 inside the boxcar respectively by switch S1, S2, S3, S5,The S6 and current wiring terminal I of battery limits 1_A、I_B、I_C、I_a、I_bCorrespondence electrical connection, the current wiring terminal-I of instrument area 2 is describedRespectively by switching S4, S7, S8 and the current wiring terminal I of battery limits 1 inside boxcar_o、I_b、I_cCorrespondence electrical connection, the instrumentVoltage wiring terminal+the U of area 2 is inside the boxcar respectively by switching S1 ', S2 ', S3 ', S5 ', S6 ' and the voltage of battery limits 1Binding post U_A、U_B、U_C、U_a、U_bCorrespondence electrical connection, the voltage wiring terminal-U of instrument area 2 distinguishes inside the boxcarBy switching S4 ', S7 ', S8 ' and the voltage wiring terminal U of battery limits 1_o、U_b、U_cCorrespondence electrical connection.As shown in figure 1, the electricity of instrument area 2Stream binding post+I is by switching S1 with battery limits current wiring terminals I_AElectrical connection, instrument area current wiring terminal+I is by openingS2 is closed with battery limits current wiring terminals I_BElectrical connection, instrument area current wiring terminal+I is connect by switching S3 with battery limits electric currentLine terminals I_CElectrical connection, instrument area current wiring terminal+I is by switching S5 with battery limits current wiring terminals I_aElectrical connection, instrumentArea current wiring terminal+I is by switching S6 with battery limits current wiring terminals I_bElectrical connection, instrument area current wiring terminal-I leads toSwitch S4 is crossed with battery limits current wiring terminals I_oElectrical connection, instrument area current wiring terminal-I is by switching S7 with battery limits electricityStream binding post I_bElectrical connection, instrument area current wiring terminal-I is by switching S8 with battery limits current wiring terminals I_cElectrical connectionVoltage wiring terminal+the U of instrument area 2 is by switching S1 ' with battery limits voltage wiring terminals U_AElectrical connection instrument area voltage terminalSon+U is by switching S2 ' with battery limits voltage wiring terminals U_BElectrical connection, instrument area voltage wiring terminal+U by switch S3 ' withBattery limits voltage wiring terminals U_CElectrical connection, instrument area voltage wiring terminal+U is by switching S5 ' and battery limits voltage terminalSub- U_aElectrical connection, instrument area voltage wiring terminal+U is by switching S6 ' with battery limits voltage wiring terminals U_bElectrical connection, instrument areaVoltage wiring terminal-U is by switching S4 ' with battery limits voltage wiring terminals U_oElectrical connection, instrument area voltage wiring terminal-U leads toSwitch S7 ' is crossed with battery limits voltage wiring terminals U_bElectrical connection, instrument area voltage wiring terminal-U is by switching S8 ' and battery limitsVoltage wiring terminal U_cElectrical connection.

Beneficial effect using above-mentioned technical proposal is that battery limits Current Voltage binding post is by switch and instrument area electricityStream voltage wiring terminal electrical connection, the automatic switchover for realizing hookup that can be flexible, it is to avoid in process of the test frequentlyThread-changing, wiring work, reduce the error rate during artificial thread-changing, wiring, improve operating efficiency.

Specifically, boxcar box body is hollow cuboid, and six faces are isolation material.

Beneficial effect using above-mentioned technical proposal is that boxcar box body uses isolation material, effectively reduces high compression ringThe electric shock risk brought is operated under border, the security in testing crew operating process is improve.

Use process：During experiment, tester climbs transformer, the insulating sheath 14 of the chuck 10 of hand-held test wire 15Point, the part of 10 front end sawtooth of chuck 13 is tightly clipped at the sleeve pipe of change electrical equipment binding post top, all wiring are disposably completed, lead toBe introduced directly into transformer current voltage signal in boxcar by overtesting line；Boxcar is by the Current Voltage in instrument area 2Binding post is connected with test apparatus binding post of the same name；Change-over switch is rotated, high voltage side of transformer and low-pressure side is each mutually straightLeakage resistance is sequentially ingressed into hookup, realizes the test successively of high voltage side of transformer and low-pressure side out of phase D.C. resistance.Such asShown in Fig. 1 and Fig. 2, when high-pressure side change-over switch 6 is switched to R_AOShelves when, switch S1, S4, S1 ', S4 ' closure, switch S2, S3,S5, S6, S7, S8, S2 ', S3 ', S5 ', S6 ', S7 ', S8 ' disconnect, now measuring transformer high-pressure side A phase D.C. resistances R_AO；WhenHigh-pressure side change-over switch 6 is switched to R_BOShelves when, switch S2, S4, S2 ', S4 ' closure, switch S1, S3, S5, S6, S7, S8, S1 ',S3 ', S5 ', S6 ', S7 ', S8 ' disconnect, now measuring transformer high-pressure side B phase D.C. resistances R_BO；When high-pressure side change-over switch 6 is cutChange to R_COShelves when, switch S3, S4, S3 ', S4 ' closure, switch S1, S2, S5, S6, S7, S8, S1 ', S2 ', S5 ', S6 ', S7 ',S8 ' disconnects, now measuring transformer high-pressure side C phase D.C. resistances R_CO；When low-pressure side change-over switch 7 is switched to R_abDuring shelves, switchS5, S7, S5 ', S7 ' closure, switch S1, S2, S3, S4, S6, S8, S1 ', S2 ', S3 ', S4 ', S6 ', S8 ' disconnect, now measureThe alternate D.C. resistance R of step down side a, b_ab；When low-pressure side change-over switch 7 is switched to R_bcDuring shelves, S6, S8, S6 are switched ',S8 ' is closed, and switchs S1, S2, S3, S4, S5, S7, S1 ', S2 ', S3 ', S4 ', S5 ', S7 ' disconnect, now measuring transformer low pressureThe alternate D.C. resistance R of side b, c_bc；When low-pressure side change-over switch 7 is switched to R_caShelves when, switch S5, S8, S5 ', S8 ' closure, switchS1, S2, S3, S4, S6, S7, S1 ', S2 ', S3 ', S4 ', S6 ', S7 ' disconnect, the now alternate direct current of measuring transformer low-pressure side c, aResistance R_ca；When high-pressure side change-over switch 6 or low-pressure side change-over switch 7 are switched to OFF grades, switch is completely in off-state.

Beneficial effect using above-mentioned technical proposal is, the complexity of traditional aerological measurement wiring, repeatability, time-consuming,The low problem of efficiency.Transformer Winding binding clip is transferred to ground using test wire, not only can be by high-altitude wiring, thread replacing workBeing transferred to ground is carried out, and reduces the number of times and risk of testing crew work high above the ground；And can be realized by change-over switch high and lowPress the automatic switchover of side three-phase windings test connection, it is to avoid wiring, thread replacing work repeatedly, and the experiment for therefore causing is missedDifference, effectively shortens test period, improves operating efficiency, reduces electric shock risk.Meanwhile, time of measuring of the present invention is short, numberAccording to accurate, measurement error will not be increased, can truly reflect the D.C. resistance of Transformer Winding, can be applied to Y/ delta connection modes35kV, 110kV and 220kV two-winding transformer direct current resistance m easurem ent experiment, it is practical, it is easy to promote.

Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the inventionAny modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.

Claims (8)

Translated fromChinese

1.一种变压器直流电阻试验接线转换盒，其特征在于，所述转换盒正面为矩形测试面板，包括：设备区（1）、仪器区（2）和操作区（3）；1. A transformer DC resistance test connection conversion box, characterized in that the front of the conversion box is a rectangular test panel, including: equipment area (1), instrument area (2) and operation area (3);所述设备区（1）内设有与变压器同名接线柱相连接的电流、电压接线端子，用于与变压器同名接线柱连接；The equipment area (1) is provided with current and voltage terminals connected to the same-named terminal of the transformer, which are used to connect with the same-named terminal of the transformer;所述仪器区（2）内设有与实验仪器同名接线端子相连接的电流、电压接线端子，用于与试验仪器同名接线端子连接；The instrument area (2) is provided with current and voltage terminals connected to the same-named terminal of the experimental instrument for connection with the same-named terminal of the experimental instrument;所述操作区（3）内设有转换开关，用于实现档位选择和试验电路的切换；The operating area (3) is provided with a changeover switch, which is used to realize the gear selection and the switching of the test circuit;所述设备区（1）和仪器区（2）内的电流、电压接线端子，在所述转换盒本体内部，通过所述转换开关控制的试验电路与所述操作区电连接。The current and voltage connection terminals in the equipment area (1) and the instrument area (2) are electrically connected to the operation area through the test circuit controlled by the transfer switch inside the conversion box body.2.根据权利要求１所述的一种变压器直流电阻试验接线转换盒，其特征在于，所述转换盒还包括接线装置，所述接线装置包括线缆（15）、夹持部件和插拔式部件，所述夹持部件与变压器接线柱连接，所述插拔式部件与所述设备区内的电流、电压接线端子连接，所述夹持部件与所述插拔式部件通过所述线缆（15）固定连接。2. A transformer DC resistance test connection conversion box according to claim 1, characterized in that the conversion box also includes a wiring device, and the wiring device includes a cable (15), a clamping part and a plug-in component, the clamping component is connected to the terminal of the transformer, the plug-in component is connected to the current and voltage terminals in the equipment area, and the clamping component and the plug-in component are connected through the cable (15) Fixed connection.3.根据权利要求2所述的一种变压器直流电阻试验接线转换盒，其特征在于，所述夹持部件包括两个夹头（10）本体、穿装固定两夹头（10）本体的转动连接轴（11），转动连接轴（11）内部穿装有弹性件（12），所述夹头（10）前端内侧设有锯齿（13），夹头（10）手持部设有绝缘护套（14）。3. A transformer DC resistance test connection conversion box according to claim 2, characterized in that, the clamping part includes two chucks (10) bodies, and the rotation of the body of the two chucks (10) is fixed The connecting shaft (11), the rotating connecting shaft (11) is equipped with an elastic member (12) inside, the inner side of the front end of the chuck (10) is provided with serrations (13), and the handle of the chuck (10) is provided with an insulating sheath (14).4.根据权利要求１所述的一种变压器直流电阻试验接线转换盒，其特征在于，所述设备区（1）内设有I_A、I_B、I_C、I₀、I_a、I_b、I_c七个设备区电流接线端子（4）和U_A、U_B、U_C、U₀、U_a、U_b、U_c七个设备区电压接线端子（5），所述电流、电压接线端子通过接线装置与变压器同名接线柱连接。4. A transformer DC resistance test connection conversion box according to claim 1, characterized in that, there are I_A , I_B , I_C , I₀ , I_a , I_b in the equipment area (1) , I_c seven equipment area current terminals (4) and U_A , U_B , U_C , U₀ , U_a , U_b , U_c seven equipment area voltage terminals (5), the current, voltage The connecting terminal is connected with the terminal with the same name of the transformer through the connecting device.5.根据权利要求１所述的一种变压器直流电阻试验接线转换盒，其特征在于，所述仪器区（2）内设有+I、-I仪器区电流接线端子（8）和+U、-U仪器区电压接线端子（9），所述电流、电压接线端子通过试验仪器自身配套的试验线缆与所述试验仪器同名接线端子对应连接。5. A transformer DC resistance test connection conversion box according to claim 1, characterized in that, the instrument area (2) is provided with +I, -I instrument area current connection terminals (8) and +U, -Voltage terminals (9) in the instrument area, the current and voltage terminals are correspondingly connected to the same-named terminals of the test instrument through the test cables provided by the test instrument itself.6.根据权利要求１所述的一种变压器直流电阻试验接线转换盒，其特征在于，所述转换开关包括高压侧转换开关（6）和低压侧转换开关（7），所述高压侧转换开关（6）包括OFF档、R_AO档、R_BO档和R_CO档，用于控制试验电路的切断和实现变压器高压侧直流电阻的测量，所述低压侧转换开关（7）包括OFF档、R_ab档、R_bc档和R_ca档，用于控制试验电路的切断和实现变压器低压侧相间电阻的测量。6. A transformer DC resistance test connection changeover box according to claim 1, characterized in that the changeover switch includes a high-voltage side changeover switch (6) and a low-voltage side changeover switch (7), and the high-voltage side changeover switch (6) Includes OFF gear, R_AO gear, R_BO gear and R_CO gear, which are used to control the cut-off of the test circuit and realize the measurement of DC resistance on the high-voltage side of the transformer. The low-voltage side transfer switch (7) includes OFF gear, R The_ab file, R_bc file and R_ca file are used to control the cut-off of the test circuit and realize the measurement of the phase-to-phase resistance of the low-voltage side of the transformer.7.根据权利要求１所述的一种变压器直流电阻试验接线转换盒，其特征在于，所述仪器区（2）电流接线端子+I在所述转换盒内部分别通过开关S1、S2、S3、S5、S6和设备区（1）电流接线端子I_A、I_B、I_C、I_a、I_b对应电连接，所述仪器区（2）电流接线端子-I在所述转换盒内部分别通过开关S4、S7、S8和设备区（1）电流接线端子I_o、I_b、I_c对应电连接，所述仪器区（2）电压接线端子+U在所述转换盒内部分别通过开关S1’、S2’、S3’、S5’、S6’和设备区（1）电压接线端子U_A、U_B、U_C、U_a、U_b对应电连接，所述仪器区（2）电压接线端子-U在所述转换盒内部分别通过开关S4’、S7’、S8’和设备区（1）电压接线端子U_o、U_b、U_c对应电连接。7. A transformer DC resistance test connection conversion box according to claim 1, characterized in that the current terminal +I of the instrument area (2) passes through the switches S1, S2, S3, S5, S6 and the equipment area (1) current connection terminals I_A , I_B , I_C , I_a , I_b are electrically connected correspondingly, and the instrument area (2) current connection terminal -I passes through the inside of the conversion box respectively The switches S4, S7, S8 are electrically connected to the current terminals I_o , I_b , and I_c of the equipment area (1), and the voltage terminal +U of the instrument area (2) passes through the switch S1' inside the conversion box respectively. , S2', S3', S5', S6' and the equipment area (1) voltage connection terminals U_A , U_B , U_C , U_a , U_b correspond to electrical connections, and the instrument area (2) voltage connection terminals- U is electrically connected to the voltage connection terminals U_o , U_b , and U_c of the equipment area (1) through switches S4', S7', and S8' respectively inside the conversion box.8.根据权利要求１所述的一种变压器直流电阻试验接线转换盒，其特征在于，所述转换盒盒体为中空长方体，六面均为绝缘材质。8. A transformer DC resistance test connection conversion box according to claim 1, characterized in that the body of the conversion box is a hollow cuboid with six sides made of insulating materials.