CN201868270U - Electric control disconnector operating mechanism latching circuit - Google Patents

Abstract

A locking circuit for an operating mechanism of an electrically controlled isolating switch. The operating mechanism of the electric isolating switch includes a female switch, a circuit breaker, a switch, a motor for a switch and a motor for a switch, and the motor shaft of the switch is connected to the switch , the motor shaft of the A switch is connected to the A switch, the auxiliary normally closed contact of the circuit breaker is connected to the power circuit of the female switch motor and the A switch motor, and the normally closed auxiliary contact of the A switch is connected to the female switch in series In the opening circuit of the switch, the normally open auxiliary contact of the female switch is connected in series to the closing circuit of the A switch. The utility model can ensure that only when the circuit breaker is disconnected, the power supply of the motor in the isolating switch operating mechanism is connected, and the isolating switch can be electrically pulled and closed; The power supply of the motor in the mechanism is cut off, and the isolating switch cannot be electrically pulled and closed, which can prevent the occurrence of vicious electrical misoperation accidents such as pulling and closing the knife switch with load or wrong switching sequence.

Description

Electric control isolating switch operating mechanism locking circuit

technical field

The utility model relates to an electric power isolating switch, in particular to an operating mechanism of an electrically controlled isolating switch, in particular to a locking circuit of the operating mechanism of an electrically controlled isolating switch.

Background technique

Most of the 110kV and above high-voltage isolating switches in the substations of the power supply company are equipped with electric operating mechanisms. The power supply of the operating mechanism of the electric control isolating switch is introduced by the quick-open switch in the terminal box or mechanism box of the substation. The introduction of the power supply has not undergone any electrical protection. The false blocking circuit is not subject to any restrictions and limitations of anti false blocking measures. The input and withdrawal of the power supply of the operating mechanism of the electric control isolating switch is manually controlled by the operator with a quick release switch before and after each operation. In this way, there is the danger and hidden danger of pulling the isolating switch with load and the wrong sequence of pulling the isolating switch, and there is also the danger that the operator forgets to disconnect the motor power supply of the operating mechanism after the operation is completed. This brings great danger and hidden danger to the safe operation of the substation.

Contents of the invention

The purpose of this utility model is to provide a locking circuit of an operating mechanism of an electrically controlled isolating switch. The locking circuit of the operating mechanism of an electrically controlled isolating switch needs to solve the problem that there is no locking protection in the power circuit of the operating mechanism of an electrically controlled isolating switch in the prior art. Measures, technical issues that bring potential safety hazards to the operation of substations.

The purpose of this utility model is achieved through the following technical solutions: the operating mechanism of the electric isolating switch includes a female switch, a circuit breaker, a switch, a switch motor and a switch motor, a switch motor shaft and a switch The gate is connected, the motor shaft of the A knife gate is connected with the A knife gate, the auxiliary normally closed contact of the circuit breaker is connected to the power circuit of the mother knife gate motor and the A knife gate motor, and the normally closed auxiliary contacts of the A knife gate are connected in series Connected to the opening circuit of the female switch, the normally open auxiliary contact of the female switch is connected in series to the closing circuit of the A switch.

In the power circuit of the A knife switch motor, an unlocking switch is connected in parallel with the auxiliary normally closed contact of the circuit breaker, and an unlocking switch is connected in parallel with the normally open auxiliary contact of the mother knife switch.

In the power supply circuit of the female switch motor, a lock release switch is connected in parallel with the auxiliary normally closed contact of the circuit breaker, and a lock release switch is connected in parallel with the normally closed auxiliary contact of the armor switch.

Compared with the prior art, the utility model has positive and obvious effects. The utility model connects the auxiliary normally closed contact of the circuit breaker to the power circuit of the female switch motor and the first switch motor in the locking circuit of the operating mechanism of the electric control isolating switch, so that it can be ensured that only when the circuit breaker is disconnected When the power supply of the motor in the isolating switch operating mechanism is turned on, the isolating switch can be electrically pulled and closed; while the circuit breaker is in the closed state, the power of the motor in the isolating switch operating mechanism is cut off, and it cannot be electrically pulled and closed. The isolation switch can prevent the occurrence of vicious electrical misoperation accidents such as pulling and closing the switch with load or wrong switching sequence; The normally open auxiliary contact of the switch is connected in series to the closing circuit of the A knife switch, so as to achieve the purpose of pulling and closing the isolating switch in the correct sequence during electric operation, that is, the sequence of closing the female switch first and then closing the A switch, and when opening It is to pull the armor knife switch first and then pull the mother knife switch. Connect a switch in parallel in the opening circuit and closing circuit of the first knife switch and the female knife switch of the power circuit of the isolating switch operating mechanism to release the lock, so as to facilitate maintenance, debugging, and accident handling. After the work is completed, the switch to release the lock must be pulled open , to restore the latchup.

Description of drawings

Fig. 1 is a structural schematic diagram of the locking circuit of the operating mechanism of the electric control isolating switch of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail through embodiment.

As shown in Figure 1, the utility model electric control isolating switch operating mechanism locking circuit, the electric isolating switch operating mechanism includes a female switch 1, a circuit breaker 2, a switch 3, a female switch motor 4 and a switch motor 5. The 4th axis of the female switch motor is connected to the female switch 1, the 5th axis of the A switch motor is connected to the A switch 3, and the opening button 41 and the closing button 42 are provided in the power circuit of the female switch motor 4, An opening button 51 and a closing button 52 are provided in the power circuit of the first switch motor 5, and the auxiliary normally closed contact 21 of the circuit breaker is connected to the power circuit of the female switch motor 4 and the first switch motor 5. The normally closed auxiliary contact 31 of the gate is connected in series to the opening circuit of the female switch 1, and the normally open auxiliary contact 11 of the female switch is connected in series to the closing circuit of the first switch 3. In the power circuit of the first knife switch motor 5, the unlocking switch 6 is connected in parallel with the auxiliary normally closed contact 21 of the circuit breaker, and the unlocking switch 6 is connected in parallel with the normally open auxiliary contact 11 of the female knife switch. In the power circuit of the female switch motor 4 , the unlocking switch 6 is connected in parallel with the auxiliary normally closed contact 21 of the circuit breaker, and the unlocking switch 6 is connected in parallel with the normally closed auxiliary contact 31 of the first knife switch.

This can ensure that only when the circuit breaker is disconnected, the power supply of the motor in the isolating switch operating mechanism is turned on, and the isolating switch can be electrically pulled and closed; The power supply of the middle motor is cut off, and the isolation switch cannot be electrically pulled or closed. Connect the normally closed auxiliary contact of the first knife switch to the opening circuit of the female knife switch in series, and connect the normally open auxiliary contact of the female knife switch to the closing circuit of the first knife switch in series, so as to achieve pull and close isolation during electric operation The purpose of the correct switching sequence is to close the female switch first and then close the armor switch, and when opening, first pull the armor switch and then pull the female switch. Connect a switch in parallel in the opening circuit and closing circuit of the first knife switch and the female knife switch of the power circuit of the isolating switch operating mechanism to release the lock, so as to facilitate maintenance, debugging, and accident handling. After the work is completed, the switch to release the lock must be pulled open , to restore the latchup.

Claims (3)

1. automatically controlled isolator operating mechanism exclusive circuit, comprise female disconnecting link in this electric isolating switch operating mechanism, circuit breaker, the first disconnecting link, female disconnecting link motor and first disconnecting link motor, female disconnecting link motor reel is connected with female disconnecting link, first disconnecting link motor reel is connected with the first disconnecting link, it is characterized in that: the auxiliary normally-closed contact of circuit breaker is connected in the electric power loop of female disconnecting link motor and first disconnecting link motor, the normally closed auxiliary contact series connection of first disconnecting link inserts in the sub-gate circuit of female disconnecting link, and the auxiliary contact series connection of often opening of female disconnecting link inserts in the closing circuit of first disconnecting link.

2. automatically controlled isolator operating mechanism exclusive circuit as claimed in claim 1, it is characterized in that: in the electric power loop of first disconnecting link motor, with the auxiliary normally-closed contact of circuit breaker and be connected with the unlocking switch, with often the opening auxiliary contact and be connected with the unlocking switch of female disconnecting link.

3. automatically controlled isolator operating mechanism exclusive circuit as claimed in claim 1, it is characterized in that: in the electric power loop of female disconnecting link motor, with the auxiliary normally-closed contact of circuit breaker and be connected with the unlocking switch, with the normally closed auxiliary contact of first disconnecting link and be connected with the unlocking switch.

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