Circuit breaker equipment closing and opening coil burnout prevention device and circuit breaker

Abstract

The present invention relates to a circuit breaker device and a circuit breaker for preventing the opening and closing coils from being burned, comprising: a first time relay, a second time relay, a first intermediate relay, a second intermediate relay, and a third intermediate relay; the time delay contact of the first time relay and the coil of the first intermediate relay are connected in series and in parallel with the coil of the first time relay and then connected to a closing operation circuit, and the normally closed contact of the first intermediate relay is connected in series to the closing coil circuit; the time delay contact of the second time relay and the coil of the second intermediate relay are connected in series and in parallel with the coil of the second time relay and then connected to an opening operation circuit, and the normally closed contact of the second intermediate relay is connected in series to the opening coil circuit. When the current continuously flows through the opening and closing coils, the safety of the opening and closing coils can be timely guaranteed to avoid damage to the opening and closing coils.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer substation equipment, and in particular relates to a circuit breaker equipment opening and closing coil anti-burning device and a circuit breaker. Background Art

[0002] The accident of opening and closing coils burning often occurs in the operation of power systems. If the circuit breaker refuses to operate due to the opening circuit of the circuit breaker, the accident will be expanded, causing the circuit breaker to open at a higher level, resulting in a large-scale power outage, and even causing serious consequences such as burning of power equipment and fire. When the integrity of the closing circuit is damaged, although the harm caused is smaller than when the integrity of the opening circuit is damaged, it also makes the line unable to transmit power normally, hindering the improvement of power supply reliability.

[0003] The opening and closing coils are an essential part of the circuit breaker equipment on each side of the line, busbar, and main transformer in the substation. The characteristic is that the current cannot flow through it for a long time, otherwise the coil will burn out. In recent years, the opening and closing coils have been burned out frequently due to the external environment, equipment usage time, mechanism jamming and other issues. The measures taken are to replace the opening and closing coils of the burned circuit breaker equipment. This not only does not fundamentally solve the problem but also increases the cost of replacement. Summary of the invention

[0004] In order to solve the problems in the prior art that the opening and closing coils are easily damaged and the replacement cost is high, the present invention provides an opening and closing coil anti-burning device for a circuit breaker equipment and a circuit breaker, which has the characteristics of timely protecting the opening and closing coils from damage and saving replacement costs.

[0005] According to a specific embodiment of the present invention, a circuit breaker device's opening and closing coil burnout prevention device includes: a first time relay, a second time relay, a first intermediate relay, and a second intermediate relay;

[0006] The time delay contact of the first time relay and the coil of the first intermediate relay are connected in series and in parallel with the coil of the first time relay and then connected to the closing operation circuit, and the normally closed contact of the first intermediate relay is connected in series to the closing coil circuit;

[0007] The delayed contact of the second time relay and the coil of the second intermediate relay are connected in series and in parallel with the coil of the second time relay and then connected to the opening operation circuit, and the normally closed contact of the second intermediate relay is connected in series in the opening coil circuit.

[0008] Furthermore, the delay time of the first time relay is greater than the inherent closing time of the circuit breaker and is no greater than 200ms.

[0009] Furthermore, the delay time of the second time relay is greater than the inherent opening time of the circuit breaker and is no greater than 200ms.

[0010] Furthermore, the contact current carrying capacity of the first intermediate relay and the second intermediate relay is not less than 5 amperes.

[0011] Furthermore, it also includes a third intermediate relay, the coil of the third intermediate relay is connected in series with the normally open contact of the first intermediate relay, the normally open contact of the second intermediate relay, and the normally open contact of the third intermediate relay in parallel and then connected to the control circuit, the normally open contact of the third intermediate relay has a self-holding function, and the control circuit is also connected in series with a local reset button and a remote release button.

[0012] Furthermore, the normally open contact of the first intermediate relay and the normally open contact of the second intermediate relay are also used to connect to the measurement and control device to monitor the circuit breaker refusal to open and refusal to close phenomenon.

[0013] Furthermore, the normally closed contact of the first intermediate relay and the normally closed contact of the second intermediate relay are both connected in parallel with capacitor protection.

[0014] Furthermore, the technical requirements of the first intermediate relay, the second intermediate relay and the third intermediate relay must at least meet the following requirements: the rated voltage of the intermediate relay coil is consistent with the operating power supply voltage; it has at least two open and two closed contacts; and the contact current carrying capacity is not less than 5 amperes, and the electrical life of the relay under normal load is not less than 10,000 times.

[0015] Furthermore, the technical requirements of the first time relay and the second time relay meet: the rated voltage of the time relay coil is consistent with the operating power supply voltage; the delay time of the opening and closing coil is 0.01-9.99 seconds, the delay time for protecting the energy storage motor circuit is 0.1-30 seconds, the delay error is ≤9%, and the electrical life is 100,000 times.

[0016] A circuit breaker provided according to a specific embodiment of the present invention comprises the above-mentioned circuit breaker device for preventing the opening and closing coils from burning out.

[0017] The beneficial effects of the present invention are as follows: the circuit composed of the time relay and the intermediate relay protects the opening coil and the closing coil of the circuit breaker respectively, and the corresponding intermediate relay is actuated after the set time relay is actuated, and the normally closed contact of the intermediate relay disconnects the power supply of the corresponding opening and closing coil circuit, thereby avoiding the opening and closing coil from being energized for a long time, so that when the opening and closing coil continues to flow with current due to the external environment, equipment use time, mechanism jamming and other problems, the safety of the opening and closing coil can be guaranteed in time, and damage to the opening and closing coil can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of a circuit breaker device's opening and closing coil burnout prevention device provided according to an exemplary embodiment;

[0020] Figure 2 is an electrical structure diagram of a circuit breaker device provided according to an exemplary embodiment;

[0021] Figure 3 It is an electrical structure diagram of a circuit breaker device provided with a device for preventing the opening and closing coils from burning out of the circuit breaker device according to an exemplary embodiment. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0023] Reference Figure 1 As shown, an embodiment of the present invention provides a circuit breaker device for preventing the opening and closing coils from burning out, comprising: a first time relay (1SJ), a second time relay (2SJ), a first intermediate relay (1ZJ) and a second intermediate relay (2ZJ);

[0024] The first time relay (1SJ1) delay contact and the first intermediate relay (1ZJ) coil are connected in series and in parallel with the first time relay (1SJ) coil before being connected to the closing operation circuit, and the normally closed contact (1ZJ1) of the first intermediate relay is connected in series to the closing coil circuit;

[0025] The delayed contact of the second time relay (2SJ1) is connected in series with the coil of the second intermediate relay (2ZJ) and then connected in parallel to the opening operation circuit. The normally closed contact (2ZJ1) of the second intermediate relay is connected in series with the opening coil circuit.

[0026] Specifically, a circuit breaker refers to a switchgear that can close, carry, and disconnect the normal current of the operating circuit, and can also close, carry, and disconnect the specified overload current (including short-circuit current) within a specified time; the closing coil: referred to as HQ, is to drive the striker through the coil excitation tape to trigger the closing spring mechanism to achieve the purpose of closing; the opening coil: referred to as TQ, is to drive the striker through the coil excitation tape to trigger the opening spring mechanism to achieve the purpose of opening. The latest statistical analysis data shows that the emergency defects of circuit breaker equipment have an increasing trend year by year, which seriously affects the safe and stable operation of the power grid, causing large-scale power outages; affecting the normal power supply to customers, causing adverse effects on society, and causing losses in power supply, etc. Among the emergency defects of these circuit breaker equipment, nearly 30% are caused by the burning of the opening and closing coils, resulting in the circuit breaker refusing to open or close. Therefore, solving the problem of frequent burning of the opening and closing coils of the circuit breaker will greatly reduce the emergency defects of the circuit breaker equipment. The actual reasons for emergency defects in circuit breaker equipment are burning of opening (closing) coils, damage to energy storage motors, low gas pressure, loose bolts, and stuck mechanisms. Burning of opening (closing) coils accounts for one-third of the total. The cost of the existing method of replacing opening and closing coils includes the purchase of opening and closing coils, personnel costs, vehicle use, and power supply loss, and increases with the increase of the voltage of the substation used.

[0027] Reference Figure 2 From the drawings and data of the substation in operation in the prior art shown, it can be seen that the opening and closing circuits of the circuit breaker equipment at the 110kV, 35kV, and 10kV intervals are that the opening coil of the circuit breaker equipment is directly connected in series with the opening circuit, and the closing coil is directly connected in series with the closing circuit, and there is no design for the protection of the opening and closing coils. Once any of the following situations occurs, such as a mechanical failure of the opening or closing electromagnet, refusal of the circuit breaker to open or close, improper adjustment of the shape of the opening and closing states of the auxiliary switch, improper use of the auxiliary switch contacts of the opening and closing control circuit, failure of the protection measurement and control device, and inconsistency in the resistance of the opening and closing circuits, the current will continue to flow through the opening and closing coils, causing them to burn out.

[0028] from Figure 2 It can be seen that the existing circuit breaker equipment is from top to bottom: operating power supply +KM, -KM; the trip monitoring circuit composed of TWJ relay; the closing holding circuit composed of HBJ relay; the anti-jump circuit composed of TBJ relay; and the protection closing, manual closing and remote control closing circuits below; the corresponding circuit of the opening coil is the same principle.

[0029] Reference Figure 3As shown, the present invention forms a protection circuit by adding an intermediate relay and a time relay. The delay contact (1SJ1 or 2SJ1) of the time relay is set at the front end of the intermediate relay. The normally closed contact of the intermediate relay is connected in series between the closing or opening coil circuit. It is in a normally closed state during normal operation, so that the opening and closing coils can work normally. Once the manual or remote control (automatic) opening and closing operation is triggered, the time relay delays The contact closes after the delay setting time to power on the intermediate relay, and the normally closed contact of the intermediate relay disconnects the power supply of the opening and closing coil circuit, thereby de-energizing the opening and closing coils, ensuring the safety of the opening and closing coils, avoiding the opening and closing coils from being burned, and saving additional expenses.

[0030] In some specific embodiments of the present invention, the delay time of the first time relay (ie, the delay time of 1SJ1) can be appropriately adjusted according to the inherent closing time to be greater than the inherent closing time of the circuit breaker and not greater than 200ms.

[0031] The delay time of the second time relay (i.e., the 2SJ1 delay time) is appropriately adjusted according to the inherent opening time of the circuit breaker. The delay time of 2SJ1 is greater than the inherent opening time of the circuit breaker and is not greater than 200ms.

[0032] The current carrying capacity of the contacts of the intermediate relay, i.e. the first intermediate relay and the second intermediate relay, is not less than 5 amperes. Capacitor protection C can be connected in parallel to the normally closed contacts of the first intermediate relay and the second intermediate relay to protect the normally closed contacts of the intermediate relay from being disconnected and burn the normally closed contacts instantly, thus ensuring the safety of the normally closed contacts of the intermediate relay.

[0033] When refusal to open or close occurs, the dispatching, operation, and maintenance personnel can check the background or monitoring system to know whether the circuit breaker mechanism is stuck. This method requires connecting the normally open contact 1ZJ2 of the first intermediate relay and the normally open contact 2ZJ2 of the second intermediate relay to the measurement and control device for linkage monitoring.

[0034] In some specific embodiments of the present invention, a third intermediate relay is also included, and the coil of the third intermediate relay is connected in series with the normally open contact of the first intermediate relay, the normally open contact of the second intermediate relay, and the normally open contact of the third intermediate relay in parallel and then connected to the control circuit, and the normally open contact of the third intermediate relay plays a self-holding role, wherein the control circuit is also connected in series with a local reset button and a remote disconnect button. In another wiring method of the present invention, the jammed signal of the mechanism requires the inspection personnel to go to the site for manual reset. At this time, it is necessary to add a 3ZJ intermediate relay to obtain the signal for the maintenance personnel to use, and a remote disconnect contact can also be connected in series to achieve remote reset.

[0035] As an implementation of the above embodiment, the technical requirements of the first intermediate relay, the second intermediate relay, and the third intermediate relay meet the following requirements: 1. The rated voltage of the intermediate relay coil is consistent with the operating power supply voltage; 2. It has at least two open and two closed contacts; 3. The contact current carrying capacity is not less than 5 amperes, and the relay has an electrical life of not less than 10,000 times under normal load. The technical requirements of the first time relay and the second time relay at least meet the following requirements: the rated voltage of the time relay coil is consistent with the operating power supply voltage; the delay time of the opening and closing coil is 0.01-9.99 seconds, the delay time for protecting the energy storage motor circuit is 0.1-30 seconds, the delay error is ≤9%, and the electrical life is 100,000 times.

[0036] The embodiment of the present invention further provides a circuit breaker, comprising the circuit breaker device's opening and closing coil burnout prevention device described in the above embodiment. The specific implementation method thereof can refer to the specific implementation method of the circuit breaker device's opening and closing coil burnout prevention device provided in the above embodiment, and the present invention will not repeat it here.

[0037] The circuit breaker equipment's opening and closing coil anti-burning device provided by the above-mentioned embodiment of the present invention is easy to monitor in operation. When the relay is damaged, the relay can be replaced without power outage, and the normal operation of the circuit breaker is not affected when the relay is damaged. The probability of each relay burning out is very small, and the installed relay is only energized for a short time during operation. There is no need to add cables. When refusal to open or close occurs, the dispatching, operation, and maintenance personnel can check the background or monitoring system to know that the opening and closing coil protection functions are activated, thereby narrowing the search range of the fault point. The probability of the circuit breaker's opening and closing coil burning out is greatly reduced, and the processing time is only the time of the first installation, which is about one-fourth of the time to process a defect in the opening and closing coil, and the circuit breaker's opening and closing circuit can be repeatedly operated, which improves the operability of the circuit breaker, improves the guarantee for the safe and stable operation of the power grid, and improves the economic benefits.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0039] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", as explained by "including" used as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0040] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A circuit breaker opening and closing coil anti-burning device, characterized in that: include: A first time relay, a second time relay, a first intermediate relay, and a second intermediate relay; The time delay contact of the first time relay and the coil of the first intermediate relay are connected in series and in parallel with the coil of the first time relay and then connected to the closing operation circuit, and the normally closed contact of the first intermediate relay is connected in series to the closing coil circuit; The delayed contact of the second time relay and the coil of the second intermediate relay are connected in series and in parallel with the coil of the second time relay and then connected to the opening operation circuit, and the normally closed contact of the second intermediate relay is connected in series in the opening coil circuit; The normally closed contact of the first intermediate relay and the normally closed contact of the second intermediate relay are both connected in parallel with capacitor protection; It also includes a third intermediate relay, the coil of which is connected in series with the normally open contact of the first intermediate relay, the normally open contact of the second intermediate relay, and the normally open contact of the third intermediate relay in parallel and then connected to a control circuit, wherein the circuit is also connected in series with a local reset button and a remote disconnect button.

2. The circuit breaker opening and closing coil anti-burning device according to claim 1, characterized in that: The delay time of the first time relay is greater than the inherent closing time of the circuit breaker and is no greater than 200ms.

3. The circuit breaker opening and closing coil anti-burning device according to claim 1, characterized in that: The delay time of the second time relay is greater than the inherent opening time of the circuit breaker and is no greater than 200ms.

4. The circuit breaker opening and closing coil anti-burning device according to claim 1, characterized in that: The contact current carrying capacity of the first intermediate relay and the second intermediate relay is not less than 5 amperes.

5. The circuit breaker opening and closing coil anti-burning device according to claim 1, characterized in that: The normally open contact of the first intermediate relay and the normally open contact of the second intermediate relay are also used to connect to the measurement and control device to monitor the circuit breaker refusal to open and refusal to close phenomenon.

6. The circuit breaker opening and closing coil anti-burning device according to claim 5, characterized in that: The technical requirements of the first intermediate relay, the second intermediate relay and the third intermediate relay must at least meet the following requirements: the rated voltage of the intermediate relay coil is consistent with the operating power supply voltage; and there are at least two open and two closed contacts; The contact current carrying capacity is not less than 5 amperes, and the electrical life of the relay under normal load is not less than 10,000 times.

7. The circuit breaker opening and closing coil anti-burning device according to any one of claims 1 to 5, characterized in that: The technical requirements of the first time relay and the second time relay meet: the rated voltage of the time relay coil is consistent with the operating power supply voltage; the delay time of the opening and closing coil is 0.01-9.99 seconds, the delay time for protecting the energy storage motor circuit is 0.1-30 seconds, the delay error is ≤9%, and the electrical life is 100,000 times.

8. A circuit breaker, characterized in that: A circuit breaker device comprising a circuit breaker coil burnout prevention device as claimed in any one of claims 1 to 7.

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