CN213956758U - Breaking-in control circuit of circuit breaker equipment - Google Patents
Breaking-in control circuit of circuit breaker equipment Download PDFInfo
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- CN213956758U CN213956758U CN202023233548.0U CN202023233548U CN213956758U CN 213956758 U CN213956758 U CN 213956758U CN 202023233548 U CN202023233548 U CN 202023233548U CN 213956758 U CN213956758 U CN 213956758U
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Abstract
The utility model relates to a break-in control circuit of circuit breaker equipment, including zero line and live wire, the end-to-end connection rectifier bridge of zero line and live wire, and the positive pole line of direct current is connected out by the output of rectifier bridge, the negative pole line, parallelly connected have closing coil H of counter JS and circuit breaker between positive pole line and the negative pole line, separating brake coil F, still including parallelly connected first auxiliary relay ZJ1 between zero line and live wire in proper order, second auxiliary relay ZJ2 and third auxiliary relay ZJ3, still parallelly connected have first time relay SJ1 between first auxiliary relay ZJ1 and second auxiliary relay ZJ2 between zero line and the live wire, second time relay SJ2 and third time relay SJ 3. The utility model discloses the stable performance is reliable, the operation of being convenient for, can realize the automatic control to the circuit breaker break-in, and circuit breaker machinery break-in test bench provides very reliable aassessment to the mechanical life and the electric life-span of circuit breaker, can greatly improve circuit breaker life-span detection efficiency, uses manpower sparingly, material resources and effective reduce cost.
Description
Technical Field
The utility model relates to the technical field, concretely relates to break-in control circuit of circuit breaker equipment.
Background
The circuit breaker is a high-voltage circuit breaker, and is named because arc extinguishing media and insulating media of a contact gap after arc extinguishing are high vacuum; the arc extinguishing device has the advantages of small volume, light weight, suitability for frequent operation and no need of maintenance for arc extinguishing, and is relatively popularized in power distribution networks. The vacuum circuit breaker is an indoor power distribution device in a 3.6-12 kV and 50Hz three-phase alternating-current system, can be used as a protection and control device of electrical equipment in industrial and mining enterprises, power plants and transformer substations, and can also be configured in a middle cabinet, a double-layer cabinet and a fixed cabinet for controlling and protecting high-voltage electrical equipment.
The circuit breaker is generally used in the distribution network, and the requirement of its manufacturing is higher, and in order to guarantee the reliability when the circuit breaker uses, the circuit breaker need do multiple type test before dispatching from the factory, and in order to make the result of test more accurate, need do the break-in of certain time to the circuit breaker. The manual running-in is time-consuming and labor-consuming, while the automatic running-in based on the PLC system is expensive.
Those skilled in the art have therefore endeavored to develop a circuit breaker control break-in circuit that is less costly and can replace manual operation break-in.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art, the utility model provides a circuit breaker equipment break-in control circuit can realize the automatic control to the circuit breaker break-in, and circuit breaker machinery break-in test bench provides very reliable aassessment to the mechanical life and the electric life-span of circuit breaker, can greatly improve the efficiency that circuit breaker life-span detected, saves required manpower and materials and can effective reduce cost.
The utility model discloses a realize through following technical scheme:
provides a break-in control loop of circuit breaker equipment, which comprises a zero line and a live line, wherein the tail ends of the zero line and the live line are connected with a rectifier bridge, and are connected with a direct-current positive wire and a direct-current negative wire through the output end of the rectifier bridge, a counter JS, a closing coil H, an opening coil F and a motor M of a circuit breaker are connected in parallel between the positive wire and the negative wire,
the zero line and live line relay system further comprises a first intermediate relay ZJ1, a second intermediate relay ZJ2 and a third intermediate relay ZJ3 which are sequentially connected in parallel between the zero line and the live line, and a first time relay SJ1, a second time relay SJ2 and a third time relay SJ3 are further connected in parallel between the first intermediate relay ZJ1 and the second intermediate relay ZJ2 between the zero line and the live line;
the first intermediate relay ZJ1 is provided with a first normally open auxiliary contact (23-24), a second normally open auxiliary contact (33-34) and a third normally open auxiliary contact (13-14);
the second intermediate relay ZJ2 is provided with a first normally open auxiliary contact (13-14) and a second normally open auxiliary contact (43-44);
the third intermediate relay ZJ3 is provided with first normally open auxiliary contacts (13-14), second normally open auxiliary contacts (43-44), third normally open auxiliary contacts (53-54) and normally closed auxiliary contacts (21-22);
the first time relay SJ1 is provided with normally closed auxiliary contacts (5-8) and normally open auxiliary contacts (1-3);
the second time relay SJ2 is provided with a normally open auxiliary contact (6-8);
the third time relay SJ3 is provided with a normally closed auxiliary contact (5-8);
wherein:
on a branch where the first intermediate relay ZJ1 is located, the first intermediate relay ZJ1 is sequentially connected with a normally closed auxiliary contact (5-8), a stop switch T and a start switch Q of a third time relay SJ3 in series, and a third normally open auxiliary contact (13-14) of the first intermediate relay ZJ1 is connected with two sides of the start switch Q in parallel;
on a branch where the first time relay SJ1 is located, the first time relay SJ1 is connected with a first normally-open auxiliary contact (13-14) of the third intermediate relay ZJ3 in series;
a first normally open auxiliary contact (23-24) and a second normally open auxiliary contact (33-34) of an intermediate relay ZJ1 are respectively connected to a zero line and a live line between a branch where the first time relay ZJ1 is located and a branch where the time relay SJ1 is located;
a second time relay SJ2 is arranged on the branch, and the second time relay SJ2 is connected with a first normally open auxiliary contact (13-14) of a second intermediate relay ZJ2 in series;
the second intermediate relay ZJ2 is arranged on the branch, and the second intermediate relay ZJ2 is connected with the normally closed auxiliary contacts (21-22) of the third intermediate relay ZJ3 in series;
on a branch circuit where the third intermediate relay ZJ3 is located, a second normally-open auxiliary contact (43-44) of the third intermediate relay ZJ3 is connected with a normally-open auxiliary contact (6-8) of the second time relay SJ2 in parallel, and then the normally-closed auxiliary contact (5-8) of the first time relay SJ1 and the third intermediate relay ZJ3 are sequentially connected in series;
on the branch where the counter JS is located, the counter JS is also connected with a normally open auxiliary contact (1-3) of a first time relay SJ1 in series;
the closing coil H is also connected with a second normally open auxiliary contact (43-44) of a second intermediate relay ZJ2 in series on the branch circuit where the closing coil H is located;
and the opening coil F is also connected with a third normally open auxiliary contact (53-54) of a third intermediate relay ZJ3 in series on the branch circuit where the opening coil F is positioned.
This scheme carries out switching control to the circuit through the auxiliary contact who designs a plurality of time relays, auxiliary relay and cooperation relay, and the cooperation counter count sets up corresponding parameters such as the separating brake interval time of circuit breaker, combined floodgate interval time and required running-in number of times total time, can realize the automatic running-in operation to the circuit breaker, can greatly improve the efficiency that circuit breaker life-span detected, saves required manpower and materials.
Preferably, a transformer VT is further connected between the tail ends of the zero line and the live line and the rectifier bridge, and a change-over switch SK capable of adjusting output voltage is arranged at the output end of the transformer VT.
Through setting up transformer VT, can be according to the voltage requirement of the circuit breaker difference, make the alternating current voltage of transformer output and the voltage matching of circuit breaker through adjustment change over switch SK, and then guarantee going on of the stability of circuit breaker break-in.
Further, a power indicator lamp D1 is connected between the head ends of the zero line and the live line.
Through setting up power indicator D1, light after whole access power, the suggestion operator circuit switch-on can carry out the running-in operation.
Furthermore, a closing indicator lamp D2 is further arranged on a branch where the second intermediate relay ZJ2 is located, and the closing indicator lamp D2 is connected in parallel to two ends of the second intermediate relay ZJ 2.
Through setting up closing indicator D2, can be when the break-in circuit carries out the closing operation, light closing indicator D2, when finishing closing a floodgate, extinguish closing indicator D2, can directly perceivedly remind the operator the closing operation that the return circuit goes on.
Furthermore, a branch circuit where the third intermediate relay ZJ3 is located is further provided with a switching-off indicator lamp D3, and the switching-off indicator lamp D3 is connected in parallel to two sides of the normally closed auxiliary contact (5-8) of the third intermediate relay ZJ3 and the first time relay SJ 1.
Through setting up separating brake pilot lamp D3, can be when the break-in circuit carries out the separating brake operation, light separating brake pilot lamp D3 and when the end separating brake, extinguish separating brake pilot lamp, can directly perceivedly remind the separating brake operation that the operator's return circuit carried out.
Preferably, a protective rectifier bridge is further connected in series between the motor M and the positive line on the branch where the motor M is located.
The protection rectifier bridge is arranged on the motor M branch, so that when misoperation occurs, the motor is prevented from being influenced by direct current through the protection effect of the rectifier bridge, and the motor can be protected.
The utility model has the advantages that:
the circuit breaker operating mechanism running-in test method has the advantages that the PLC running-in system with high cost is replaced by the series-parallel connection cooperation of the plurality of intermediate relays, the time relays and the auxiliary contacts of the time relays, the time delay of the time relays only needs to be set, the running-in cycle test of the circuit breaker operating mechanism can be realized by pressing down the starting switch, and the running-in test time, manpower and material resources are saved until the running-in cycle test is finished, so that debugging workers are facilitated, and the running-in test efficiency is improved.
The automatic control of the break-in of the circuit breaker can be realized, the mechanical break-in test bed of the circuit breaker provides reliable assessment for the mechanical life and the electrical life of the circuit breaker, the efficiency of the service life detection of the circuit breaker can be greatly improved, the required manpower and material resources are saved, and the cost can be effectively reduced.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Shown in the figure:
1. live wire, 2, zero wire, 3, power indicator light, 4, stop switch, 5, start switch, 6, first intermediate relay ZJ1, 7, second normally open auxiliary contact (33-34) of first intermediate relay ZJ1, 8, normally closed auxiliary contact of third time relay SJ3, 9, third normally open auxiliary contact (13-14) of first intermediate relay ZJ1, 10, first normally open auxiliary contact (23-24) of first intermediate relay ZJ1, 11, first normally open auxiliary contact (13-14) of third intermediate relay ZJ3, 12, first time relay SJ1, 13, second time relay SJ2, 14, first normally open auxiliary contact (13-14) of second intermediate relay ZJ2, 15, third time relay SJ3, 16, closing indicator light D2, 17, normally closed auxiliary contact (21-22) of third intermediate relay ZJ3, 18. second intermediate relay ZJ2, 19, opening indicator lamp D3, 20, third intermediate relay ZJ3, 21, normally closed auxiliary contact (5-8) of first time relay SJ1, 22, second normally open auxiliary contact (43-44) of third intermediate relay ZJ3, 23, normally open auxiliary contact (6-8) of second time relay SJ2, 24, transformer VT, 25, transfer switch SK, 26, rectifier bridge, 27, positive line, 28, negative line, 29, counter JS, 30, normally open auxiliary contact (1-3) of first time relay SJ1, 31, closing coil, 32, second normally open auxiliary contact (43-44) of second intermediate relay ZJ2, 33, third normally open auxiliary contact (53-54) of third intermediate relay ZJ3, 34, opening coil, 35, motor, 36, protection rectifier bridge.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
A break-in control loop of circuit breaker equipment comprises a zero line 1 and a live line 1, wherein the tail ends of the zero line 2 and the live line 1 are connected with a rectifier bridge 26, the tail ends of the rectifier bridge 26 are connected with a positive electrode wire 27 and a negative electrode wire 28 of direct current, a counter JS29, a closing coil H31, an opening coil F34 and a motor M35 of a circuit breaker are connected in parallel between the positive electrode wire 27 and the negative electrode wire 28,
the zero line relay type three-phase alternating current motor also comprises a first intermediate relay ZJ1, a second intermediate relay ZJ2 and a third intermediate relay ZJ3 which are sequentially connected in parallel between the zero line 2 and the live line 1, wherein a first time relay SJ1, a second time relay SJ2 and a third time relay SJ3 are also connected in parallel between the first intermediate relay ZJ1 and the second intermediate relay ZJ2 between the zero line 2 and the live line 1;
the first intermediate relay ZJ1 is provided with a first normally open auxiliary contact (23-24) 10, a second normally open auxiliary contact (33-34) 7 and a third normally open auxiliary contact (13-14) 9;
the second intermediate relay ZJ2 is provided with a first normally open auxiliary contact (13-14) 14 and a second normally open auxiliary contact (43-44) 32;
the third intermediate relay ZJ3 is provided with a first normally open auxiliary contact (13-14) 11, a second normally open auxiliary contact (43-44) 22, a third normally open auxiliary contact (53-54) 33 and a normally closed auxiliary contact (21-22) 17;
the first time relay SJ1 is provided with normally closed auxiliary contacts (5-8) 21 and normally open auxiliary contacts (1-3) 30;
the second time relay SJ2 is provided with a normally open auxiliary contact (6-8) 23;
the third time relay SJ3 is provided with a normally closed auxiliary contact (5-8) 8;
wherein:
on a branch circuit where the first intermediate relay ZJ1 is located, the first intermediate relay ZJ1 is sequentially connected with a normally closed auxiliary contact (5-8) 8, a stop switch T4 and a start switch Q5 of a third time relay SJ3 in series, and a third normally open auxiliary contact (13-14) 9 of the first intermediate relay ZJ1 is connected with two sides of the start switch Q5 in parallel;
on a branch where the first time relay SJ1 is located, the first time relay SJ1 is connected with a first normally-open auxiliary contact (13-14) 11 of the third intermediate relay ZJ3 in series;
a first normally-open auxiliary contact (23-24) 10 and a second normally-open auxiliary contact (33-34) 7 of an intermediate relay ZJ1 are respectively connected to a zero line and a live line between a branch where the first time relay ZJ1 is located and a branch where the time relay SJ1 is located;
a second time relay SJ2 is arranged on a branch circuit, and the second time relay SJ2 is connected with a first normally open auxiliary contact (13-14) 14 of a second intermediate relay ZJ2 in series;
the second intermediate relay ZJ2 is arranged on the branch, and the second intermediate relay ZJ2 is connected with the normally closed auxiliary contacts (21-22) 17 of the third intermediate relay ZJ3 in series;
on a branch circuit where the third intermediate relay ZJ3 is located, a second normally-open auxiliary contact (43-44) 22 of the third intermediate relay ZJ3 is connected with a normally-open auxiliary contact (6-8) 23 of a second time relay SJ2 in parallel, and then is sequentially connected with a normally-closed auxiliary contact (5-8) 21 of a first time relay SJ1 and the third intermediate relay ZJ3 in series;
on the branch where the counter JS29 is located, the counter JS29 is also connected in series with a normally open auxiliary contact (1-3) 30 of a first time relay SJ 1;
on a branch circuit where the closing coil H31 is located, the closing coil H31 is also connected with a second normally-open auxiliary contact (43-44) 32 of a second intermediate relay ZJ2 in series;
and the branch circuit on which the opening coil F34 is positioned is also connected with the opening coil F34 in series with a third normally open auxiliary contact (53-54) 33 of a third intermediate relay ZJ 3.
A transformer VT24 is connected between the tail ends of the zero line 2 and the live line 1 and the rectifier bridge 26, and a change-over switch SK25 capable of adjusting output voltage is arranged at the output end of the transformer VT 24.
And a power indicator lamp D13 is connected between the head ends of the zero line 2 and the live line 1.
And a closing indicator lamp D216 is further arranged on a branch where the second intermediate relay ZJ2 is located, and the closing indicator lamp D216 is connected in parallel at two ends of the second intermediate relay ZJ 2.
And a brake-off indicator lamp D319 is further arranged on a branch where the third intermediate relay ZJ3 is located, and the brake-off indicator lamp D319 is connected in parallel to two sides of the normally-closed auxiliary contact (5-8) 21 of the third intermediate relay ZJ3 and the first time relay SJ 1.
On the branch where the motor M35 is located, a protective rectifier bridge 36 is also connected in series between the motor M35 and the positive line 27.
The utility model discloses a working process:
before the running-in operation is started:
the operating voltage of the circuit breaker is confirmed, and by operating the changeover switch SK25, the output voltage is ensured to be consistent with the operating voltage of the circuit breaker.
And setting corresponding parameters of the breaker such as switching-off interval time, switching-on interval time, total time of required running-in times and the like.
During operation:
1. the AC220V alternating current is switched in, then the starting switch Q5 is pressed, at the moment, the first intermediate relay ZJ1 is electrified, the first normally-open auxiliary contacts (23-24) of the first intermediate relay ZJ1 are closed, the second normally-open auxiliary contacts (33-34) are closed, meanwhile, the third time relay SJ3 is electrified, the second intermediate relay ZJ2 is electrified, the closing indicator lamp D2 is lightened, the transformer VT24 is electrified, and the circuit breaker is in an energy storage state;
2. then, a second normally-open auxiliary contact (43-44) of the second intermediate relay ZJ2 is closed, and the breaker is switched on;
3. first normally-open auxiliary contacts (13-14) of a second intermediate relay ZJ2 are closed until a set closing interval time is reached, a second time relay SJ2 is electrified, normally-open auxiliary contacts (6-8) of a second time relay SJ2 are closed, a third intermediate relay ZJ3 is electrified, at the moment, normally-closed auxiliary contacts (21-22) of the third intermediate relay ZJ3 are disconnected, a second intermediate relay ZJ2 is powered off, a closing indicator lamp D2 is turned off, second normally-open auxiliary contacts (43-44) of the second intermediate relay ZJ2 are disconnected, and a circuit breaker closing loop is powered off;
meanwhile, second normally-open auxiliary contacts (43-44) of the third intermediate relay ZJ3 are closed, and a third intermediate relay ZJ3 circuit achieves a self-holding state; the third normally open auxiliary contacts (53-54) of the third intermediate relay ZJ3 are closed, and the breaker is opened;
4. first normally-open auxiliary contacts (13-14) of a third intermediate relay ZJ3 are closed until the set opening interval time is reached, a first time relay SJ1 is electrified, normally-closed auxiliary contacts (5-8) of a first time relay SJ1 are opened, a third intermediate relay ZJ3 is powered off, third normally-open auxiliary contacts (53-54) of a third intermediate relay ZJ3 are opened, and a breaker opening loop is powered off; the second normally open auxiliary contacts (43-44) of the third intermediate relay ZJ3 are opened, and the opening indicator lamp D3 is turned off; the first normally-open auxiliary contacts (13-14) of the third intermediate relay ZJ3 are disconnected, and the first time relay SJ1 is powered off;
a normally closed auxiliary contact (5-8) of a first time relay SJ1 is closed, a normally open auxiliary contact (1-3) of a first time relay SJ1 is disconnected, a counter JS is powered off, and counting is carried out for 1 time;
the normally closed auxiliary contacts (21-22) of the third intermediate relay ZJ3 are closed, and a switching-on and switching-off cycle operation is completed.
When the time reaches the total time of the required running-in times set by each time relay, the automatic running-in of the circuit breaker is stopped; when the stop switch T4 is pressed, the automatic break-in of the circuit breaker stops. In both operation modes, the counter JS29 can display the opening and closing times of the circuit breaker.
Of course, the above description is not limited to the above examples, and technical features of the present invention that are not described in the present application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only used for illustrating the technical solutions of the present invention and are not intended to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the claims of the present invention.
Claims (6)
1. The utility model provides a break-in control circuit of circuit breaker equipment, includes zero line and live wire, the end-to-end connection rectifier bridge of zero line and live wire to connect out direct current's positive pole line, negative pole line by the output of rectifier bridge, parallelly connected closing coil H, the separating brake coil F and the motor M that have counter JS and circuit breaker between positive pole line and the negative pole line, its characterized in that:
the zero line and live line relay system further comprises a first intermediate relay ZJ1, a second intermediate relay ZJ2 and a third intermediate relay ZJ3 which are sequentially connected in parallel between the zero line and the live line, and a first time relay SJ1, a second time relay SJ2 and a third time relay SJ3 are further connected in parallel between the first intermediate relay ZJ1 and the second intermediate relay ZJ2 between the zero line and the live line;
the first intermediate relay ZJ1 is provided with a first normally open auxiliary contact, a second normally open auxiliary contact and a third normally open auxiliary contact;
the second intermediate relay ZJ2 is provided with a first normally open auxiliary contact and a second normally open auxiliary contact;
the third intermediate relay ZJ3 is provided with a first normally open auxiliary contact, a second normally open auxiliary contact, a third normally open auxiliary contact and a normally closed auxiliary contact;
the first time relay SJ1 is provided with a normally closed auxiliary contact and a normally open auxiliary contact;
a second time relay SJ2 is provided with a normally open auxiliary contact;
the third time relay SJ3 is provided with a normally closed auxiliary contact;
wherein:
on a branch where the first intermediate relay ZJ1 is located, the first intermediate relay ZJ1 is sequentially connected with a normally closed auxiliary contact, a stop switch T and a start switch Q of a third time relay SJ3 in series, and a third normally open auxiliary contact of the first intermediate relay ZJ1 is connected with two sides of the start switch Q in parallel;
on a branch where the first time relay SJ1 is located, the first time relay SJ1 is connected with a first normally-open auxiliary contact of the third intermediate relay ZJ3 in series;
a first normally-open auxiliary contact and a second normally-open auxiliary contact of an intermediate relay ZJ1 are respectively connected to a zero line and a live line between a branch where the first time relay ZJ1 is located and a branch where the time relay SJ1 is located;
a second time relay SJ2 is arranged on the branch, and the second time relay SJ2 is connected with a first normally open auxiliary contact (13-14) of a second intermediate relay ZJ2 in series;
the second intermediate relay ZJ2 is arranged on the branch, and the second intermediate relay ZJ2 is connected with the normally closed auxiliary contacts (21-22) of the third intermediate relay ZJ3 in series;
on a branch circuit where the third intermediate relay ZJ3 is located, a second normally-open auxiliary contact of the third intermediate relay ZJ3 is connected with a normally-open auxiliary contact of the second time relay SJ2 in parallel, and then the normally-closed auxiliary contact of the first time relay SJ1 and the third intermediate relay ZJ3 are sequentially connected in series;
on the branch where the counter JS is located, the counter JS is also connected in series with a normally open auxiliary contact of a first time relay SJ 1;
the closing coil H is also connected with a second normally open auxiliary contact of a second intermediate relay ZJ2 in series on the branch circuit where the closing coil H is located;
and on the branch circuit where the opening coil F is located, the opening coil F is also connected with a third normally-open auxiliary contact of a third intermediate relay ZJ3 in series.
2. The circuit breaker apparatus break-in control loop of claim 1, wherein: a transformer VT is also connected between the tail ends of the zero line and the live line and the rectifier bridge, and the output end of the transformer VT is provided with a change-over switch SK capable of adjusting output voltage.
3. The circuit breaker apparatus break-in control loop of claim 1, wherein: and a power indicator lamp D1 is connected between the head ends of the zero line and the live line.
4. The circuit breaker apparatus break-in control loop of claim 1, wherein: and a closing indicator lamp D2 is further arranged on a branch where the second intermediate relay ZJ2 is located, and the closing indicator lamp D2 is connected in parallel at two ends of the second intermediate relay ZJ 2.
5. The circuit breaker apparatus break-in control loop of claim 1, wherein: and a branch circuit where the third intermediate relay ZJ3 is located is also provided with a brake-off indicator lamp D3, and the brake-off indicator lamp D3 is connected in parallel to two sides of the normally closed auxiliary contact of the third intermediate relay ZJ3 and the first time relay SJ 1.
6. The circuit breaker apparatus break-in control loop of claim 1, wherein: and a protective rectifier bridge is also connected in series between the motor M and the positive line on the branch where the motor M is located.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023233548.0U CN213956758U (en) | 2020-12-29 | 2020-12-29 | Breaking-in control circuit of circuit breaker equipment |
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| CN202023233548.0U CN213956758U (en) | 2020-12-29 | 2020-12-29 | Breaking-in control circuit of circuit breaker equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114913733A (en) * | 2022-03-31 | 2022-08-16 | 郑州万特电气股份有限公司 | Fire zero short circuit fault simulation circuit for electrical equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114913733A (en) * | 2022-03-31 | 2022-08-16 | 郑州万特电气股份有限公司 | Fire zero short circuit fault simulation circuit for electrical equipment |
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