CN220822622U - Motor protection circuit of GIS circuit breaker - Google Patents

Abstract

The utility model relates to a motor protection loop of a GIS circuit breaker, which comprises a circuit breaker motor loop, a relay KM and a time relay KT, wherein the relay KM is respectively provided with an A1/A2 coil contact and two pairs of auxiliary contacts of L1/T1 and L2/T2, and the time relay KT is provided with A2/7 coil contact and A1/4 time delay contact; the two coil contacts A1/A2 of the relay KM are in power failure synchronization with the two auxiliary contacts L1/T1 and L2/T2 of the relay KM, the 2/7 coil contact of the time relay KT is in power failure synchronization with the 1/4 auxiliary contact of the relay KT, the coil contact A1 of the relay KM is connected with a travel switch of a motor, the coil contact A2 is connected with a delay normally closed contact of the time relay KT, and the auxiliary contacts L1/T1 and L2/T2 of the relay KM are respectively connected with a live wire and a zero wire of a motor loop. The circuit can prevent the damage of the energy storage of the breaker motor to the breaker motor, so that the operation of the equipment is safer and more reliable, the circuit has extremely high practicability, and the requirement of equipment overhaul is met.

Description

A motor protection circuit for GIS circuit breaker

Technical Field

The utility model relates to the technical field of _SF6 gas-insulated metal-enclosed switch auxiliary equipment, in particular to a motor protection circuit of a GIS circuit breaker.

Background technique

At present, when the GIS circuit breaker motor circuit is storing motor energy, it is possible that the energy storage is not in place and the travel switch cannot be disconnected, the intermediate relay is always energized, and the motor keeps rotating. Over time, the motor will be overloaded and damaged, and the fault cannot be cut off in time, posing a hidden danger to safe operation.

Utility Model Content

In view of the deficiencies in the prior art, the utility model provides a motor protection circuit for a GIS circuit breaker, which improves the protection circuit of the motor of the GIS circuit breaker, makes the equipment operation safer and more reliable, has extremely high practicality, and meets the needs of equipment maintenance.

The utility model is realized through the following technical solutions:

Provided is a motor protection circuit for a GIS circuit breaker, comprising a circuit breaker motor circuit, a relay KM and a time relay KT,

Relay KM has A1/A2 coil contacts and two pairs of auxiliary contacts L1/T1 and L2/T2, and time relay KT has 2/7 coil contacts and 1/4 delay contacts;

The two coil contacts A1/A2 of relay KM keep synchronization with the two auxiliary contacts L1/T1 and L2/T2 of relay KM in gaining and losing power. The 2/7 coil contact of time relay KT keeps synchronization with the 1/4 auxiliary contact of relay KT in gaining and losing power. The coil contact A1 of relay KM is connected to the travel switch of the motor, the coil contact A2 is connected to the delayed normally closed contact of the time relay KT, and the auxiliary contacts L1/T1 and L2/T2 of relay KM are respectively connected to the live wire and the neutral wire of the motor circuit.

Furthermore, the A1 and A2 coil contacts of the relay KM and the two auxiliary contacts L1/T1 and L2/T2 of the relay KM are all connected in the GIS control cabinet through the terminal block.

Furthermore, the 2/7 coil contacts of the time relay KT and the 1/4 auxiliary contacts of the time relay KT are connected in the GIS control cabinet through the terminal block.

Beneficial effects of the utility model:

The utility model adds the coil and the normally closed delay contact of the time relay into the original circuit. When the motor circuit breaker is storing energy, the circuit breaker mechanism is not in place all the time, the coil KM is always energized, and the coil of the time relay KT is energized and started at the same time. If the motor circuit has not completed energy storage after 180s, the normally closed delay contact of the time relay KT is disconnected, the coil KM is also de-energized at the same time, and the normally open auxiliary contact of KM is also disconnected at the same time, and the motor circuit is de-energized, so that the motor will not have energy storage timeout, so that the equipment can operate safely.

The protection circuit of the GIS circuit breaker motor effectively prevents the damage to the circuit breaker motor caused by excessive energy storage in the circuit breaker motor, improves the protection circuit of the GIS circuit breaker motor, makes the equipment operation safer and more reliable, has extremely high practicality, and meets the needs of equipment maintenance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a circuit diagram of a knife switch control circuit in the prior art.

FIG2 is a schematic diagram of the circuit structure of the utility model.

As shown in the figure:

1. Relay KM, 2. Time relay KT.

Detailed ways

In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

A motor protection circuit of a GIS circuit breaker includes a circuit breaker motor circuit, a relay KM1 and a time relay KT2. The relay KM1 has A1/A2 coil contacts and two pairs of auxiliary contacts L1/T1 and L2/T2 respectively, and the time relay KT2 has 2/7 coil contacts and 1/4 delay contacts.

The two coil contacts A1/A2 of relay KM1 keep synchronization with the two auxiliary contacts L1/T1 and L2/T2 of relay KM1 in gaining and losing power. The 2/7 coil contact of time relay KT2 keeps synchronization with the 1/4 auxiliary contact of relay KT2 in gaining and losing power. The coil contact A1 of relay KM1 is connected to the travel switch of the motor, and the coil contact A2 is connected to the delayed normally closed contact of the time relay KT2. The auxiliary contacts L1/T1 and L2/T2 of relay KM1 are respectively connected to the live wire and the neutral wire of the motor circuit.

The A1 and A2 coil contacts of relay KM1 and the two auxiliary contacts L1/T1 and L2/T2 of relay KM1 are all connected in the GIS control cabinet through terminal blocks.

The 2/7 coil contacts of time relay KT2 and the 1/4 auxiliary contacts of time relay KT2 are connected in the GIS control cabinet through terminal blocks.

By adding the coil and normally closed delay contact of the time relay into the original circuit, when the motor circuit breaker motor is storing energy, the circuit breaker mechanism is not in place, the coil KM is always energized, and the time relay KT2 coil is energized and started at the same time. If the motor circuit has not completed energy storage after 180s, the normally closed delay contact of the time relay KT2 is disconnected, the coil KM is also de-energized at the same time, the normally open auxiliary contact of KM is also disconnected at the same time, and the motor circuit is de-energized, so that the motor will not have energy storage timeout, so that the equipment can operate safely, effectively preventing the circuit breaker motor from being damaged by energy storage overload, and improving the protection circuit of the GIS circuit breaker motor, making the equipment operation safer and more reliable, with extremely high practicality, meeting the needs of equipment maintenance.

Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims (3)

1. A motor protection circuit of a GIS circuit breaker, comprising a circuit breaker motor circuit, characterized in that it also comprises a relay KM and a time relay KT, Relay KM has A1/A2 coil contacts and two pairs of auxiliary contacts L1/T1 and L2/T2, and time relay KT has 2/7 coil contacts and 1/4 delay contacts; The two coil contacts A1/A2 of relay KM keep synchronization with the two auxiliary contacts L1/T1 and L2/T2 of relay KM in gaining and losing power. The 2/7 coil contact of time relay KT keeps synchronization with the 1/4 auxiliary contact of relay KT in gaining and losing power. The coil contact A1 of relay KM is connected to the travel switch of the motor, the coil contact A2 is connected to the delayed normally closed contact of the time relay KT, and the auxiliary contacts L1/T1 and L2/T2 of relay KM are respectively connected to the live wire and the neutral wire of the motor circuit. 2. The motor protection circuit of the GIS circuit breaker according to claim 1 is characterized in that the A1 and A2 coil contacts of the relay KM and the two auxiliary contacts L1/T1 and L2/T2 of the relay KM are all connected in the GIS control cabinet through a terminal block. 3. The motor protection circuit of the GIS circuit breaker according to claim 1 is characterized in that the 2/7 coil contacts of the time relay KT and the 1/4 auxiliary contacts of the time relay KT are both connected in the GIS control cabinet through a terminal block.