Anti-misoperation device for universal circuit breaker

Abstract

The utility model discloses an anti-misoperation device for a universal circuit breaker, which comprises an under-voltage release, a shunt release, a closed electromagnet, an energy storage motor, a voltage monitoring module and a current monitoring module, and the voltage monitoring module and the current monitoring module are both used for increasing judgment conditions for internal line faults of the universal circuit breaker. According to the invention, the normally closed contact of the under-voltage protection relay is connected in parallel with the normally closed contact of the under-voltage release in the universal circuit breaker, and the normally open contact of the over-current protection relay is connected in series with the normally open contact of the shunt release, so that conditions for line fault judgment are added. The circuit breaker trips only when the internal intelligent tripper and the external monitoring module judge the line fault at the same time, so that tripping events caused by misoperation of the intelligent tripper are effectively reduced, and the accuracy and reliability of judging the line fault by the universal circuit breaker are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of universal circuit breakers, in particular to an anti-misoperation device for a universal circuit breaker. Background Technique

[0002] As a common and important power equipment, the low-voltage universal circuit breaker is mainly used for distributing electric energy, protecting circuits and electrical equipment, and has the functions of overload, undervoltage and short-circuit protection. The realization of these protection functions depends on the intelligent release that issues a tripping command according to the collected signals of the protected circuit when the signals reach the set threshold values, and drives the tripping device to trip the circuit breaker.

[0003] Figure 1 is a commonly used control schematic diagram of a universal circuit breaker. Among them, SB1 is the undervoltage button, and KA1 is the normally closed contact of the undervoltage module inside the universal circuit breaker. When the button is pressed or the power supply voltage is insufficient, the undervoltage release will act to cause the universal circuit breaker to trip; SB2 is the shunt trip button, and KA2 is the normally open contact inside the intelligent release. When the button is pressed or the intelligent release detects a fault, this circuit is connected, and the shunt trip release acts to cause a trip; SB3 is the closing button. When this button is pressed, this circuit is connected, the closing electromagnet is energized, the switch is closed, and at the same time the energy storage motor is energized and runs. After the energy storage is completed, the energy storage motor is de-energized and the energy storage indicator light is on.

[0004] However, in the actual use process, the stability and reliability of the intelligent release are directly related to the power supply quality. Once a misoperation trip occurs, it will not only cause serious economic losses, but may even cause personal injuries, and the restoration of power supply requires manual operation, which prolongs the power transmission time and wastes manpower and material resources.

[0005] Therefore, the utility model provides a new solution to solve this problem. Content of the Utility Model

[0006] In view of the above situation, in order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide an anti-misoperation device for a universal circuit breaker.

[0007] The technical solution it adopts is: an anti-misoperation device for a universal circuit breaker, including an undervoltage release, a shunt trip release, a closing electromagnet and an energy storage motor, and further includes a voltage monitoring module, which is arranged at the front-end three-phase power supply of the universal circuit breaker for real-time monitoring of the power supply voltage; a current monitoring module, which is arranged at the back-end three-phase load of the universal circuit breaker for real-time monitoring of the current of each phase load of the universal circuit breaker; both the voltage monitoring module and the current monitoring module are used to increase the determination conditions for internal line faults of the universal circuit breaker.

[0008] Preferably, the voltage monitoring module is an undervoltage protection relay.

[0009] Preferably, the normally closed contact of the under-voltage protection relay is connected in parallel with the normally closed contact of the under-voltage release.

[0010] Preferably, the current monitoring module includes three current transformers, which are respectively arranged on the power supply lines at the three-phase load ends of the universal circuit breaker, and each current transformer is connected with an over-current protection relay.

[0011] Preferably, the normally open contacts of the three over-current protection relays are connected in parallel, and then are connected in series with the normally open contact in the shunt trip.

[0012] By the above technical solutions, the beneficial effects of the present utility model are as follows: In this application, a voltage monitoring module and a current monitoring module are respectively arranged at the front end and the rear end of the universal circuit breaker to monitor the power supply voltage and the load current in real time. By connecting the normally closed contact of the under-voltage protection relay in parallel with the normally closed contact of the under-voltage release inside the universal circuit breaker, and connecting the normally open contact of the over-current protection relay in series with the normally open contact in the shunt trip, the conditions for judging line faults of this device are increased. Only when both the internal intelligent release and the external monitoring module judge line faults at the same time, the circuit breaker will trip, thereby effectively reducing the tripping events caused by the misoperation of the intelligent release, and significantly improving the accuracy and reliability of the universal circuit breaker in judging line faults. Description of the Drawings

[0013] Figure 1 It is the control schematic diagram of the universal circuit breaker in the prior art.

[0014] Figure 2 It is the main circuit diagram of the anti-misoperation device of the present utility model.

[0015] Figure 3 It is the control schematic diagram of the anti-misoperation device of the present utility model. Detailed Embodiments

[0016] Regarding the foregoing and other technical contents, features and effects of the present utility model, they will be clearly presented in the following detailed description of the embodiments in conjunction with the attached Figure 2 to attached Figure 3 In the detailed description of the embodiments, it will be clearly shown. The structural contents mentioned in the following embodiments are all with reference to the drawings of the specification.

[0017] The following will describe each exemplary embodiment of the present utility model with reference to the drawings.

[0018] A universal circuit breaker anti-misoperation device includes an under-voltage release, a shunt trip, a closing electromagnet and an energy storage motor.

[0019] In the specific implementation process, such as Figure 2As shown in the figure, the universal circuit breaker anti-misoperation device of the present application further includes a voltage monitoring module, which is arranged at the front-end three-phase power supply of the universal circuit breaker QF and is used to monitor the power supply voltage in real time. A current monitoring module is arranged at the back-end three-phase load of the universal circuit breaker QF and is used to monitor the current of each phase load of the universal circuit breaker QF in real time. Both the voltage monitoring module and the current monitoring module are used to increase the determination conditions for internal line faults of the universal circuit breaker QF.

[0020] Specifically, as Figure 2 and 3 shown, the voltage monitoring module is an under-voltage protection relay (U<), and the normally closed contact KV of the under-voltage protection relay (U<) is connected in parallel with the normally closed contact KA1 in the under-voltage release.

[0021] The current monitoring module includes three current transformers (TA1, TA2, and TA3), which are respectively arranged on the power supply lines at the three-phase load ends of the universal circuit breaker QF and are used to detect the current conditions of each phase load of the universal circuit breaker QF. And each current transformer is respectively connected with an over-current protection relay (I>), and the normally open contacts of the three over-current protection relays (I>) are connected in parallel (KI1, KI2, and KI3), and then are connected in series with the normally open contact KA2 of the shunt release.

[0022] When the universal circuit breaker anti-misoperation device of the present application is working specifically, since the normally closed contact KV of the under-voltage protection relay (U<) is connected in parallel with the normally closed contact KA1 in the under-voltage release, therefore, when only one of the under-voltage release and the under-voltage protection relay (U<) in the universal circuit breaker determines under-voltage, this circuit will not lose power and the universal circuit breaker will not trip; only when both are under-voltage will the universal circuit breaker trip. Similarly, since the normally open contacts of the three over-current protection relays (I>) are connected in parallel (KI1, KI2, and KI3), and then are connected in series with the normally open contact KA2 of the under-voltage module in the shunt release, when the shunt release determines an over-current or short-circuit fault, KA2 is closed, and when any one or more of the three over-current protection relays have an excessive current and cause 1-3 of their normally open contacts (KI1, KI2, or KI3) to be closed, this circuit will be closed, the shunt release will act, and the universal circuit breaker will trip.

[0023] In summary, the present utility model adds a voltage monitoring module and a current monitoring module, and connects the normally closed (open) contacts of the under-voltage protection relay and the over-current protection relay in parallel (series) in the circuit to increase the determination conditions for line faults. Only when the intelligent release inside the universal circuit breaker misoperates will it not cause a trip. When both the intelligent release inside the universal circuit breaker and the anti-misoperation device of the present utility model determine a line fault, the circuit breaker will trip, greatly reducing the risk of misoperation tripping and improving the accuracy and reliability of the universal circuit breaker in determining line faults.

[0024] The above is a further detailed description of the present utility model in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited thereto; for those skilled in the art of the present utility model and related technical fields, on the premise of the technical solution idea of the present utility model, the expansion, operation methods, and data replacement should all fall within the protection scope of the present utility model.

Claims

1. A universal circuit breaker anti-misoperation device, including an under-voltage release, a shunt release, a closing electromagnet and an energy storage motor, characterized in that: It further includes a voltage monitoring module, which is arranged at the front-end three-phase power supply of the universal circuit breaker and is used for real-time monitoring of the power supply voltage; A current monitoring module, which is arranged at the back-end three-phase load of the universal circuit breaker and is used for real-time monitoring of the current of each phase load of the universal circuit breaker; Both the voltage monitoring module and the current monitoring module are used to increase the determination conditions for internal line faults of the universal circuit breaker.

2. The universal circuit breaker anti-misoperation device according to claim 1, wherein, The voltage monitoring module is an under-voltage protection relay.

3. The universal circuit breaker anti-misoperation device according to claim 2, characterized in that, The normally closed contact of the under-voltage protection relay is connected in parallel with the normally closed contact of the under-voltage release.

4. The universal circuit breaker anti-misoperation device according to claim 3, characterized in that, The current monitoring module includes three current transformers, which are respectively arranged on the power supply lines at the three-phase load ends of the universal circuit breaker, and each current transformer is respectively connected with an over-current protection relay.

5. The universal circuit breaker anti-misoperation device according to claim 4, characterized in that, The normally open contacts of the three over-current protection relays are connected in parallel, and then are connected in series with the normally open contact in the shunt release.

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