CN206387827U - DC Resistance Test of Transformer wiring boxcar - Google Patents

Abstract

The utility model discloses a DC resistance test connection conversion box for a transformer, which relates to the technical field of transformer test equipment, and includes an equipment area, an instrument area and an operation area; the equipment area is provided with current and voltage terminals connected with the same-named terminal of the transformer. The instrument area is equipped with current and voltage terminals connected to the terminals of the same name of the experimental instrument, and the operation area is equipped with a transfer switch. The circuit is electrically connected to the operating area. The utility model 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. , so that the high-altitude wiring change work is transferred to the ground, avoiding multiple high-altitude wiring change, improving work efficiency, and eliminating potential safety hazards.

Description

Transformer DC resistance test junction conversion box

technical field

The utility model belongs to the technical field of transformer test equipment, in particular to a transformer DC resistance test connection conversion box.

Background technique

Transformer is one of the main electrical equipment in the power system. Its regular test and maintenance is one of the main tasks of substation maintenance. In particular, by measuring the DC resistance of the transformer winding connected to the bushing, you can check the internal wire joints of the winding. Welding quality, welding quality of lead wires and winding joints, whether the contact between each tap position of the voltage tap changer and the bushing is good, whether the parallel branch circuit is connected correctly, whether there is open circuit or poor contact in the current-carrying part of the transformer, and whether there is a short circuit fault in the winding Wait.

When using the traditional method to test the DC resistance of the transformer, the tester needs to wear a safety belt to climb up the transformer, hang the safety belt hook on a solid structure, and then perform test wiring on the high-voltage side A-phase winding; the DC resistance measurement work At the end, the testers repeat the above operations, and measure the windings and DC resistances of phases B and C on the high-voltage side and phases A, B and C on the low-voltage side in turn. During the whole operation process, the test personnel need to repeatedly climb the transformer at least 6 times to connect and change the wires, which is not only labor-intensive and time-consuming, but also has safety hazards such as falling and electric shock.

Utility model content

The technical problem to be solved by the utility model is to provide a transformer DC resistance test wiring conversion box to solve the traditional transformer DC resistance test process, which needs to repeatedly climb the transformer for high-altitude wiring and line change work. . By adopting the transformer DC resistance test wiring conversion box, the high-altitude wiring and line change work can be transferred to the ground, and all the wiring can be completed by climbing the transformer only once, reducing the number and risk of high-altitude operations for test personnel; and can be realized through the transfer switch The automatic switching of the three-phase winding test wiring on the high and low voltage sides avoids repeated wiring and line changing, effectively shortens the test time and improves work efficiency.

In order to solve the problems of the technologies described above, the technical solution adopted by the utility model is:

Provide 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, instrument area and operation area;

In the equipment area, there are current and voltage terminals connected to the terminal with the same name of the transformer, which are used to connect with the terminal with the same name of the transformer;

The instrument area is provided with current and voltage terminals connected to the same-named terminal of the experimental instrument, which is used to connect with the same-named terminal of the experimental instrument;

There is a changeover switch in the operating area, which is used to realize the gear selection and the switching of the test circuit;

The current and voltage connection terminals in the equipment area and the instrument area are electrically connected to the operation area through the test circuit controlled by the transfer switch inside the conversion box body.

Preferably, the conversion box further includes a wiring device, and the wiring device includes a cable, a clamping component and a plug-in component, the clamping component is connected to the terminal of the transformer, and the plug-in component is connected to the terminal in the equipment area. The current and voltage terminals are connected, and the clamping part and the plug-in part are fixedly connected through the cable.

Preferably, the clamping part includes two chuck bodies, and a rotating connecting shaft that is worn and fixed on the two chuck bodies. The rotating connecting shaft is equipped with an elastic member, the inner side of the front end of the chuck is provided with serrations, and the handle of the chuck is provided with With insulating sheath.

Preferably, there are seven equipment area current connection terminals I _A , I _B , I _C , I ₀ , I _a , I _b , I _c and U _A , U _B , U _C , U ₀ , U _a in the equipment area. , U _b , U _c seven voltage terminals in the equipment area, the current and voltage terminals are connected to the terminal with the same name of the transformer through the wiring device.

Preferably, the instrument area is provided with +I, -I instrument area current connection terminals and +U, -U instrument area voltage connection terminals. The terminals with the same name of the instrument are connected correspondingly.

Preferably, the transfer switch includes a high-voltage side transfer switch and a low-voltage side transfer switch, and the high-voltage side transfer switch includes OFF gear, R _AO gear, R _BO gear and R _CO gear, which are used to control the disconnection of the test circuit and realize the high-voltage side of the transformer. For the measurement of DC resistance, the low-voltage side switch includes OFF gear, _Rab gear, R _bc gear and R _ca gear, which are used to control the disconnection of the test circuit and realize the measurement of the phase-to-phase resistance of the low-voltage side of the transformer.

Preferably, the current connection terminal +I in the instrument area is inside the conversion box through the switches S1, S2, S3, S5, S6 and the current connection terminals I _A , I _B , I _C , I _a , and I _b in the equipment area respectively. connection, the instrument area current connection terminal-I is electrically connected to the equipment area current connection terminals I _o , I _b , and I _c through switches S4, S7, S8 respectively in the conversion box, and the instrument area voltage connection terminal +U is electrically connected to the voltage connection terminals U _A , U _B , U _C , U _a , U _b of the equipment area through the switches S1', S2', S3', S5', S6' respectively inside the conversion box. The voltage connection terminal -U in the instrument area is electrically connected to the voltage connection terminals U _o , U _b , and U _c in the equipment area through switches S4', S7', S8' respectively in the conversion box.

Preferably, the conversion box body is a hollow cuboid with six sides made of insulating material.

The beneficial effect of adopting the above technical solution is that in the traditional transformer DC resistance test process, the operator needs to climb the transformer several times to carry out high-altitude wiring and wire replacement work, which is not only time-consuming and inefficient, but also has a high risk of falling and electric shock. Transformer DC resistance test wiring conversion box is used, which can transfer high-altitude wiring and line change work to the ground, which reduces the number of high-altitude operations and safety risks of test personnel, avoids repeated wiring and line change work, and effectively shortens the test time and improves Improved work efficiency and strong practicability.

Description of drawings

Fig. 1 is a schematic diagram of the internal circuit connection of the converter box described in the utility model;

Fig. 2 is the front view of the conversion box described in the utility model;

Fig. 3 is a structural schematic diagram of the clamping part of the wiring device described in the present invention;

Fig. 4 is a schematic structural diagram of the plug-in components of the wiring device of the present invention.

In the figure: 1. Equipment area; 2. Instrument area; 3. Operation area; 4. Current terminal in equipment area; 5. Voltage terminal in equipment area; 6. High-voltage side changeover switch; 7. Low-voltage side changeover switch; 8. Current terminal in the instrument area; 9. Voltage terminal in the instrument area; 10. Chuck; 11. Rotating connection shaft; 12. Elastic piece;

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the utility model is not limited to the following description.

Combined with Figure 1-Figure 4, the details are as follows:

As shown in Figure 1, a transformer DC resistance test connection conversion box is 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;

The equipment area 1 is provided with current and voltage terminals connected to the terminal with the same name of the transformer, which are used to connect with the terminal with the same name of the transformer;

The instrument area 2 is provided with current and voltage terminals connected with the same-named terminal of the experimental instrument, for connecting with the same-named terminal of the experimental instrument;

A changeover switch is provided in the operating area 3 for realizing gear selection and switching of test circuits;

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.

Specifically, as shown in Figures 3 and 4, the conversion box also includes a wiring device, the wiring device includes a cable 15, a clamping component and a plug-in component, the clamping component is connected to the transformer terminal, and the The plug-in component is connected to the current and voltage terminals in the equipment area, and the clamping component is fixedly connected to the plug-in component through the cable 15; the clamping component includes two chucks 10 Body, wear and fix the rotating connecting shaft 11 of the two chucks 10 bodies, the embodiment of the utility model takes the rotatable bolt as an example, wear and fix the two chucks 10 bodies, and the rotating connecting shaft 11 is equipped with an elastic member 12 inside, such as As shown in FIG. 3 , the embodiment of the utility model takes a spring as an example. The inside of the front end of the collet 10 is provided with serrations 13 , and the handle of the collet 10 is provided with an insulating sheath 14 . During the test wiring process, the tester inserts the cable 15 plug 16 into the through hole of the current and voltage terminal in the equipment area, holds the insulating sheath 14, and clamps the clamp 10 and the serration 13 tightly on the top sleeve of the transformer terminal. tube, so as to realize the firm connection between the conversion box and the terminal of the same name of the transformer.

The beneficial effect of adopting the above technical solution is that the wiring device and the conversion box are connected in a plug-in structure, which is simple and convenient to operate. The hand-held part is equipped with an insulating sheath, which reduces the risk of electric shock for testers and effectively eliminates potential safety hazards.

Specifically, as shown in Figure ₂ , there _{are seven} equipment area current connection terminals ₄ and _{U A} , _{U B ,} U _C , U ₀ , U _a , U _b , U _c seven voltage terminals 5 in the equipment area, the current and voltage terminals are connected to the terminal with the same name of the transformer through the wiring device; +I, - are set in the instrument area 2 The current connection terminal 8 in the I instrument area and the voltage connection terminal 9 in the +U, -U instrument area, the current and voltage connection terminals are correspondingly connected to the same-named connection terminals of the test instrument through the supporting test cables of the test instrument itself. During the test, each terminal in the equipment area 1 is connected to the terminal with the same name of the transformer to be tested through the wiring device, and each terminal in the instrument area 2 is connected to the terminal with the same name of the test instrument through the test cable of the test instrument itself. One-to-one connection.

The beneficial effect of adopting the above-mentioned technical solution is that by setting the current and voltage terminals with the same name on the converter box body and correspondingly connected with the transformer to be tested, all the wiring work can be completed at one time. During the test process, there is no need to climb the transformer to perform manual wiring. , Change the line work, reduce the test time, improve work efficiency, and avoid the test error and electric shock risk that may be caused by disassembly and wiring.

Specifically, as shown in Figure 2, the transfer switch includes a high-voltage side transfer switch 6 and a low-voltage side transfer switch 7, and the high-voltage side transfer switch 6 includes OFF gear, R _AO gear, R _BO gear and R _CO gear, for controlling Cut off 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 _ab gear, R _bc gear and R _ca gear, which are used to control the disconnection of the test circuit and realize the phase-to-phase transition on the low voltage side of the transformer Measurement of resistance. During the test, turn the rotary switch to the corresponding position to realize the automatic switching of the test circuit inside the conversion box, and connect the winding to be tested indicated by the gear position to the test circuit to complete the measurement of the resistance value of the test resistance .

The beneficial effect of adopting the above-mentioned technical scheme is that, during the test, it is unnecessary to manually change the line and wiring, and the automatic switching of the test circuit can be realized inside the conversion box through the switch, which effectively avoids the danger of the test personnel changing the line at high altitude. The operation is simple and convenient, which saves operation time and improves work efficiency.

Specifically, the current connection terminal +I in the instrument area 2 passes through the switches S1, S2, S3, S5, S6 and the current connection terminals I _A , I _B , I _C , I _a , I _b in the equipment area 1 respectively inside the conversion box Corresponding to the electrical connection, the current connection terminal-I of the instrument area 2 is electrically connected to the current connection terminals _Io , _Ib , and _Ic of the equipment area 1 through the switches S4, S7, S8 respectively in the conversion box, and the instrument Zone 2 voltage connection terminal +U passes switches S1', S2', S3', S5', S6' and equipment zone 1 voltage connection terminal U _A , U _B , U _C , U _a , U respectively in the conversion box _b corresponds to the electrical connection, and the instrument area 2 voltage terminal -U is electrically connected to the equipment area 1 voltage terminal U _o , U _b , U _c through switches S4', S7', S8' respectively in the conversion box . As shown in Figure 1, the current connection terminal +I in the instrument area 2 is electrically connected to the current connection terminal I _A in the equipment area through the switch S1, and the current connection terminal +I in the instrument area is electrically connected to the current connection terminal I _B in the equipment area through the switch S2. The current connection terminal +I in the equipment area is electrically connected to the current connection terminal I _C in the equipment area through the switch S3, the current connection terminal +I in the instrument area is electrically connected to the current connection terminal I _a in the equipment area through the switch S5, and the current connection terminal +I in the instrument area is connected through the switch S6 is electrically connected to the current connection terminal I _b in the equipment area, the current connection terminal -I in the instrument area is electrically connected to the current connection terminal I _o in the equipment area through the switch S4, and the current connection terminal -I in the instrument area is connected to the current connection terminal I in the equipment area through the switch S7 _b electrical connection, the instrument area current terminal -I is electrically connected to the equipment area current terminal I through the switch S8 _c is electrically connected to the instrument area 2 voltage terminal +U through the switch S1' and the equipment area voltage terminal U _A is electrically connected to the instrument area voltage wiring Terminal +U is electrically connected to voltage terminal U _B in the equipment area through switch S2', voltage terminal +U in the instrument area is electrically connected to voltage terminal U _C in the equipment area through switch S3', and voltage terminal +U in the instrument area is connected through switch S5 ' is electrically connected to the voltage connection terminal U _a in the equipment area, the voltage connection terminal +U in the instrument area is electrically connected to the voltage connection terminal U _b in the equipment area through the switch S6', and the voltage connection terminal -U in the instrument area is connected to the voltage connection in the equipment area through the switch S4' The terminal U _o is electrically connected, the voltage connection terminal -U in the instrument area is electrically connected to the voltage connection terminal U _b in the equipment area through the switch S7', and the voltage connection terminal -U in the instrument area is electrically connected to the voltage connection terminal U _c in the equipment area through the switch S8'.

The beneficial effect of adopting the above technical scheme is that the current and voltage terminals in the equipment area are electrically connected with the current and voltage terminals in the instrument area through switches, which can realize the automatic switching of the test circuit flexibly and conveniently, and avoid frequent line changing and wiring work during the test process. , reducing the error rate in the process of manual line change and wiring, and improving work efficiency.

Specifically, the body of the conversion box is a hollow cuboid with six sides made of insulating materials.

The beneficial effect of adopting the above technical solution is that the conversion box body is made of insulating material, which effectively reduces the risk of electric shock caused by operation in a high-voltage environment, and improves the safety of the test personnel during operation.

Use process: During the test, the tester climbs the transformer, holds the test line 15 part of the insulating sheath 14 of the clamp 10, and clamps the serrated part 13 at the front end of the clamp 10 tightly to the casing at the top of the transformer terminal, and completes all at one time. Connect the current and voltage signals of the transformer directly into the conversion box through the test line; The DC resistance is sequentially connected to the test circuit to realize the sequential testing of the DC resistance of different phases on the high voltage side and low voltage side of the transformer. As shown in Figure 1 and Figure 2, when the high-voltage side switch 6 is switched to the R _AO gear, the switches S1, S4, S1', S4' are closed, and the switches S2, S3, S5, S6, S7, S8, S2', S3', S5', S6', S7', _S8 ' are disconnected, at this time measure the DC resistance R _AO of phase A on the high voltage side of the transformer; , S4' are closed, switches S1, S3, S5, S6, S7, S8, S1', S3', S5', S6', S7', S8' are open, at this time measure the transformer high voltage side B phase DC resistance R _BO ; When the high-voltage side switch 6 is switched to the R _CO gear, the switches S3, S4, S3', S4' are closed, and the switches S1, S2, S5, S6, S7, S8, S1', S2', S5', S6' , S7', _S8 ' are disconnected, and at this time measure the C-phase DC resistance R _CO on the high voltage side of the transformer; S2, S3, S4, S6, S8, S1', S2', S3', S4', S6', S8' are disconnected, and at this time measure the DC resistance R _ab between phases a and b of the low voltage side of the transformer; 7 When switching to R _bc gear, switches S6, S8, S6', S8' are closed, switches S1, S2, S3, S4, S5, S7, S1', S2', S3', S4', S5', S7' disconnected, at this time measure the DC resistance _{R bc} between the phases b and c of the low voltage side of the transformer; S4, S6, S7, S1', S2', S3', S4', S6', S7' are disconnected, at this time measure the DC resistance R _ca between the phases c and a of the transformer low voltage side; when the high voltage side transfer switch 6 or the low voltage side When changeover switch 7 was switched to the OFF gear, the switches were all in disconnected state.

The beneficial effect of adopting the above technical solution is that the traditional high-altitude measurement wiring has problems such as complexity, repetition, time-consuming, and low efficiency. Use the test line to transfer the transformer winding clamp to the ground, not only can the high-altitude wiring and wire change work be transferred to the ground, which reduces the number and risk of the test personnel's high-altitude operations; and can realize the high-voltage and low-voltage side three-phase winding through the transfer switch The automatic switching of test wiring avoids repeated wiring and changing work, and the test errors caused by it, effectively shortens the test time, improves work efficiency, and reduces the risk of electric shock. At the same time, the utility model has short measurement time, accurate data, no increase in measurement error, and can truly reflect the DC resistance of the transformer winding. Strong, easy to promote.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (8)

1. a kind of DC Resistance Test of Transformer wiring boxcar, it is characterised in that the boxcar front is test rectangle face Plate, including：Battery limits（1）, instrument area（2）And operating space（3）；

The battery limits（1）It is interior provided with the electric current, the voltage wiring terminal that are connected with transformer binding post of the same name, be used for and transformation Device binding post connection of the same name；

The instrument area（2）It is interior provided with the electric current, the voltage wiring terminal that are connected with laboratory apparatus binding post of the same name, for Test apparatus binding post connection of the same name；

The operating space（3）It is interior to be provided with change-over switch, for realizing gear selection and the switching of hookup；

The battery limits（1）With instrument area（2）Interior electric current, voltage wiring terminal, in the boxcar body interior, pass through institute The hookup for stating change-over switch control is electrically connected with the operating space.

2. a kind of DC Resistance Test of Transformer wiring boxcar according to claim 1, it is characterised in that the conversion Box also includes termination, and the termination includes cable（15）, hold assembly and plug-in part, the hold assembly with Transformer binding post is connected, and the plug-in part is connected with the electric current in the battery limits, voltage wiring terminal, the clamping Part passes through the cable with the plug-in part（15）It is fixedly connected.

3. a kind of DC Resistance Test of Transformer wiring boxcar according to claim 2, it is characterised in that the clamping Part includes two chucks（10）Body, install and fix two chucks（10）The rotation connecting shaft of body（11）, rotate connecting shaft （11）Inside is coated with elastic component（12）, the chuck（10）Leading inside is provided with sawtooth（13）, chuck（10）Handheld Division is provided with Insulating sheath（14）.

4. a kind of DC Resistance Test of Transformer wiring boxcar according to claim 1, it is characterised in that the equipment Area（1）It is interior to be provided with I_A、I_B、I_C、I₀、I_a、I_b、I_cSeven battery limits current wiring terminals（4）And U_A、U_B、U_C、U₀、U_a、U_b、U_cSeven Battery limits voltage wiring terminal（5）, the electric current, voltage wiring terminal are connected by termination and transformer binding post of the same name Connect.

5. a kind of DC Resistance Test of Transformer wiring boxcar according to claim 1, it is characterised in that the instrument Area（2）It is interior to be provided with+I ,-I instrument area current wiring terminal（8）With+U ,-U instrument area voltage wiring terminal（9）, the electric current, electricity Crimp line terminals and pass through the connection corresponding with test apparatus binding post of the same name of the supporting experiment cable of test apparatus itself.

6. a kind of DC Resistance Test of Transformer wiring boxcar according to claim 1, it is characterised in that the conversion Switch includes high-pressure side change-over switch（6）With low-pressure side change-over switch（7）, the high-pressure side change-over switch（6）Including OFF grades, R_AOShelves, R_BOShelves and R_COShelves, for Control experiment circuit cut-out and realize the measurement of high voltage side of transformer D.C. resistance, it is described Low-pressure side change-over switch（7）Including OFF grades, R_abShelves, R_bcShelves and R_caShelves, for Control experiment circuit cut-out and realize transformation The measurement of the alternate resistance of device low-pressure side.

7. a kind of DC Resistance Test of Transformer wiring boxcar according to claim 1, it is characterised in that the instrument Area（2）Current wiring terminal+I is inside the boxcar respectively by switching S1, S2, S3, S5, S6 and battery limits（1）Electric current Binding post I_A、I_B、I_C、I_a、I_bCorrespondence electrical connection, the instrument area（2）Current wiring terminal-I parts in the boxcar Not by switching S4, S7, S8 and battery limits（1）Current wiring terminal I_o、I_b、I_cCorrespondence electrical connection, the instrument area（2）Voltage Binding post+U is inside the boxcar respectively by switching S1 ', S2 ', S3 ', S5 ', S6 ' and battery limits（1）Voltage link Terminal U_A、U_B、U_C、U_a、U_bCorrespondence electrical connection, the instrument area（2）Voltage wiring terminal-U leads to respectively inside the boxcar Cross switch S4 ', S7 ', S8 ' and battery limits（1）Voltage wiring terminal U_o、U_b、U_cCorrespondence electrical connection.

8. a kind of DC Resistance Test of Transformer wiring boxcar according to claim 1, it is characterised in that the conversion Box box body is hollow cuboid, and six faces are isolation material.