CN211981154U

CN211981154U - High-voltage switch cabinet control loop with accident locking function

Info

Publication number: CN211981154U
Application number: CN202020643312.5U
Authority: CN
Inventors: 刘玉芒; 郭志棚; 高文君
Original assignee: Shanxi Jinmei Tianyuan Chemical Co ltd
Current assignee: Shanxi Jinmei Tianyuan Chemical Co ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2020-11-20
Anticipated expiration: 2030-04-26

Abstract

The utility model relates to a 10kV high tension motor is qualified for the next round of competitions cubical switchboard control circuit, specifically is the high tension switchgear control circuit who has accident blocking function. The high-voltage switch cabinet control loop with the accident locking function comprises a microcomputer protection device and further comprises a closing locking relay KA, a coil of the closing locking relay KA is connected with a normally open contact and a reset button FG of a tripping signal relay inside the microcomputer protection device in series and then connected between a control bus KM and a control bus KM-, a normally closed contact of the closing locking relay KA is connected in series in a circuit breaker closing control loop, and the other normally open contact KA of the closing locking relay KA and a closing locking indicator lamp RD are connected between the control bus KM and the control bus KM-after being connected in series. The process the utility model discloses reform transform the back, the control circuit wiring of circuit breaker is compared with former control circuit wiring, does not have too big change, and fundamentally has avoided the emergence of the mistake circuit breaker condition of closing under the accident situation, has improved the security of 10kV power supply system operation.

Description

High-voltage switch cabinet control loop with accident locking function

Technical Field

The utility model relates to a 10kV high tension motor is qualified for the next round of competitions cubical switchboard control circuit, specifically is the high tension switchgear control circuit who has accident blocking function.

Background

The 10kV high-voltage motor outgoing line switch cabinet control loop is shown in figure 1, the switch cabinet control loop comprises a motor microcomputer protection and measurement and control device (microcomputer protection device for short), an X6:3 port (power positive port) of the microcomputer protection device is connected with a control bus KM +, an X6:16 port (power negative port) is connected with the control bus KM-, an X6:10 port (tripping port) is connected with the control bus KM through a field tripping button SB1, an X6:10 port is also connected with the control bus KM through remote/local switches SA3, 4, five-prevention locks and remote/local switches SA13 and 14, an X6:12 port (tripping control loop port) is connected with the control bus KM through a breaker tripping control loop, the breaker tripping control loop comprises a breaker auxiliary normally open contact QF and a tripping coil TQ, and an X6:13 port (switching port) is connected with the control bus KM + through a field switching button SB2, a switching-off switch, The remote/local switches SA17 and 18 are connected to the control bus KM +, the X6:13 port is also connected to the control bus KM + through the remote/local switches SA1 and SA 2, five-prevention locks and the remote/local switches SA13 and SA 14, and the X6:14 port (closing control loop port) is connected to the control bus KM-through a breaker closing control loop, and the breaker closing control loop comprises an auxiliary normally closed contact QF and a closing coil HQ. When the equipment is in an off state, an auxiliary normally closed contact QF in a breaker closing control loop is in a closed state, the breaker closing control loop is connected, an auxiliary normally open contact QF in a breaker tripping control loop is in an open state, the breaker tripping control loop is disconnected, the breaker closing control loop is electrified after an on-site closing button SB2 is pressed (the ports X6:13 and X6:14 are internally communicated), a closing coil HQ is electrified, a main contact QF is closed, the production equipment normally works, the auxiliary normally closed contact QF is in an open state after the main contact QF is closed, and the auxiliary normally open contact QF is in a closed state. When an overvoltage protector in a high-voltage motor outgoing line switch cabinet bursts suddenly to cause arc short circuit, energy generated by the short circuit damages the switch cabinet, a microcomputer protection device of the switch cabinet sends a trip protection instruction to trip a circuit breaker, an auxiliary normally open contact QF is disconnected, a circuit breaker trip control loop is disconnected, a fault point is cut off rapidly, meanwhile, an auxiliary normally closed contact QF is closed, a circuit breaker closing control loop is closed, although the fault point is cut off, the power failure of part of low-voltage equipment is still caused due to the large fluctuation of system voltage, and great influence is brought to production. After tripping, in order to continue production, the circuit breaker is manually switched on by operators on the production site again SB2, the circuit breaker switching-on control loop is electrified (the ports X6:13 and X6:14 are internally communicated), the damage condition of equipment in the switch cabinet is unknown at the moment, the circuit breaker can still be switched on under the condition that no fault switch cabinet is checked, secondary accidents or accident amplification are easily caused, and potential safety hazards are brought to the safe operation of a 10kV power supply system.

Disclosure of Invention

The utility model discloses according to the analysis to circuit breaker combined floodgate control circuit problem, under the prerequisite that does not influence circuit breaker each item function realization, increase accident shutting link in the combined floodgate control circuit of circuit breaker to avoid the emergence of the mistake closed circuit breaker condition under the incident condition.

The utility model discloses an adopt following technical scheme to realize: the high-voltage switch cabinet control loop with the accident locking function comprises a microcomputer protection device, wherein a positive power port of the microcomputer protection device is connected with a control bus KM +, a negative power port is connected with the control bus KM-, a brake-off port is connected with the control bus KM through a field brake-off button SB1, a brake-off control loop port is connected with the control bus KM-through a breaker brake-off control loop, the breaker brake-off control loop comprises a breaker auxiliary normally open contact QF and a trip coil TQ, a switch-on port is connected with the control bus KM + through a field switch-on button SB2 and a remote/local switch SA, a switch-on control loop port is connected with the control bus KM-through a breaker switch-off control loop, and the breaker switch-on control loop comprises an auxiliary normally; the intelligent control system also comprises a closing latching relay KA, wherein a coil of the closing latching relay KA is connected with a normally open contact and a reset button FG of a tripping signal relay in the microcomputer protection device in series and then connected between the control buses KM and KM-, a normally closed contact of the closing latching relay KA is connected in series in a closing control loop of the circuit breaker, and the other normally open contact KA of the closing latching relay KA and a closing latching indicator RD are connected in series and then connected between the control buses KM and KM-.

The high-voltage switch cabinet control loop with the accident locking function comprises a microcomputer protection device, wherein an X6:3 port of the microcomputer protection device is connected with a control bus KM +, an X6:16 port is connected with the control bus KM-, an X6:10 port is connected with the control bus KM through a field switching-off button SB1, an X6:12 port is connected with the control bus KM through a breaker switching-off control loop, the breaker switching-off control loop comprises a breaker auxiliary normally open contact QF and a tripping coil TQ, an X6:13 port is connected with the control bus KM through a field switching-on button SB2, a remote/local switch SA17 and an 18 access control bus KM +, an X6:14 port is connected with the control bus KM through a breaker switching-on control loop, and the breaker switching-on control loop comprises an auxiliary normally closed contact; the intelligent control system also comprises a closing latching relay KA, wherein a coil of the closing latching relay KA is connected with a normally open contact and a reset button FG of a tripping signal relay in the microcomputer protection device in series and then connected between the control buses KM and KM-, a normally closed contact of the closing latching relay KA is connected in series in a closing control loop of the circuit breaker, and the other normally open contact KA of the closing latching relay KA and a closing latching indicator RD are connected in series and then connected between the control buses KM and KM-. After the microcomputer protection device sends a protection tripping instruction, a normally open contact of a tripping signal relay in the microcomputer protection device is closed, a coil of a closing latching relay KA is electrified, a normally closed contact of the closing latching relay is disconnected, a closing control loop of the circuit breaker is disconnected, and even if an operator manually closes the circuit SB2, the closing control loop of the circuit breaker cannot be electrified. And a normally open contact of the closing latching relay KA is closed, and a closing latching indicator lamp is lightened to remind an operator to check the switch cabinet. And after the problem is solved, unlocking operation is carried out, a reset key on the microcomputer protection device is pressed firstly to release the tripping signal relay, then a reset button FG is pressed, finally the closing locking relay KA is released, the normally closed contact is closed, and the breaker is allowed to be closed.

In the control loop of the high-voltage switch cabinet with the accident locking function, the normally open contact of the closing locking relay KA is connected in parallel with the normally open contact of the tripping signal relay.

After the improvement, compared with the original control circuit wiring, the control circuit wiring of the circuit breaker has no great change, but the condition that the circuit breaker is mistakenly closed in an accident state is fundamentally avoided, and the operation safety of a 10kV power supply system is improved.

Drawings

Fig. 1 is a control loop diagram of a 10kV high-voltage motor outgoing line switch cabinet.

In the figure, + KM, -KM is a control bus, ZK is an air switch, SA is a remote/local change-over switch, CZ is a breaker secondary loop plug, QF is a breaker auxiliary contact, HQ is a closing coil, TQ is a tripping coil, an SB1 on-site opening button, an SB2 on-site closing button, an FG resetting button, a KA closing latching relay and an RD closing latching indicator lamp.

Detailed Description

An intermediate relay is added in a switch cabinet control loop, defined as a closing latching relay KA, and proper wiring transformation is carried out, so that the problem can be solved. And a pair of normally closed contacts of the closing latching relay KA is connected into a closing control loop of the circuit breaker in series, when the protection action is tripped, the closing latching relay KA acts and keeps, the normally closed contacts are opened to cut off the closing control loop, after the accident processing is finished, the closing latching relay KA is reset, the normally closed contacts are closed again to connect the closing control loop, and the normal closing operation is allowed.

The current microcomputer protection device sends a protection trip instruction, and simultaneously, a trip signal relay inside the device acts and keeps the trip instruction until a reset button FG on a panel of the device is pressed. The trip signal relay outputs a pair of normally open contacts X5: 11/X5: 12 for sending a 'protection trip' signal to the central control panel. The normally open contact allows a current of 8A, 0.3A cutoff current, to pass for a long period of time. The tripping signal relay just meets the action requirement of the closing latching relay KA on the action characteristic of the normally open contact, the contact capacity is also large enough, the closing latching relay KA can be driven just by the contact, and the latching function of a closing loop of the breaker is improved.

In order to prolong the service life of the contact of the tripping signal relay, a self-holding link is introduced into a control loop KA of the closing latching relay, namely, a normally closed contact of the tripping signal relay is prolonged and is connected with a normally open contact of the closing latching relay in parallel, and a button for releasing latching is added. When the lock is released, a reset key on the microcomputer protection device is pressed firstly to release the tripping signal relay, then a reset button FG is pressed, and finally the closing lock relay KA is released, the normally closed contact of the closing lock relay is closed, and the breaker is allowed to be closed. The unlocking operation is carried out according to the sequence, the signal resetting button on the microcomputer protection device is firstly pressed, the tripping signal relay is firstly released, the normally closed contact is opened, the normally open contact of the KA is still in a closed state at the moment, and the shunting effect is achieved, so that the normally open contact of the tripping signal relay only needs to cut off a small current, and the service life of the contact is effectively prolonged.

Claims

1. The high-voltage switch cabinet control loop with the accident locking function comprises a microcomputer protection device, wherein a positive power port of the microcomputer protection device is connected with a control bus KM +, a negative power port is connected with the control bus KM-, a brake-off port is connected with the control bus KM through a field brake-off button SB1, a brake-off control loop port is connected with the control bus KM-through a breaker brake-off control loop, the breaker brake-off control loop comprises a breaker auxiliary normally open contact QF and a trip coil TQ, a switch-on port is connected with the control bus KM + through a field switch-on button SB2 and a remote/local switch SA, a switch-on control loop port is connected with the control bus KM-through a breaker switch-off control loop, and the breaker switch-on control loop comprises an auxiliary normally; the method is characterized in that: the intelligent control system also comprises a closing latching relay KA, wherein a coil of the closing latching relay KA is connected with a normally open contact and a reset button FG of a tripping signal relay in the microcomputer protection device in series and then connected between the control buses KM and KM-, a normally closed contact of the closing latching relay KA is connected in series in a closing control loop of the circuit breaker, and the other normally open contact KA of the closing latching relay KA and a closing latching indicator RD are connected in series and then connected between the control buses KM and KM-.

2. The high-voltage switch cabinet control circuit with accident locking function according to claim 1, characterized in that: and the two ends of the normally open contact of the tripping signal relay are connected in parallel with the normally open contact of the closing latching relay KA.