CN220040672U

CN220040672U - False synchronization test loop of generator

Info

Publication number: CN220040672U
Application number: CN202320639534.3U
Authority: CN
Inventors: 李方玖
Original assignee: China Yangtze Power Co Ltd
Current assignee: China Yangtze Power Co Ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-11-17
Anticipated expiration: 2033-03-28

Abstract

The utility model provides a false synchronization test loop of generator, LS distant place circuit breaker interlock loop includes isolator DS normally open contact and earthing switch ES normally closed contact of establishing ties, earthing switch ES normally closed contact and circuit breaker CB's closing coil, circuit breaker operation relay CZX is controlled by unit LCU local cabinet, be equipped with 1KLP1 and throw false synchronization test hard clamp plate at isolator DS normally open contact both ends, 1KLP1 throws false synchronization test hard clamp plate is duplex clamp plate, be equipped with 1-2, 3-4 sets of contacts respectively, 1KLP1 throws false synchronization test hard clamp plate's 1-2 contacts connect isolator DS normally open contact both ends, 3-4 contacts access unit LCU local cabinet. The remote closing interlocking loop of the hard pressing plate switching circuit breaker is used for isolating the contact at the position of the switch, so that the forced switching of the contact at the position of the switch is realized, the requirement of the false synchronous test of the generator is met, meanwhile, the forced switching state of the contact at the position of the switch is sent to the local cabinet of the unit LCU, the short-circuit state of the contact at the position of the switch can be monitored, and the short-circuit state of the contact at the position of the switch is also used as a locking condition in the false synchronous test logic of the generator.

Description

False synchronization test loop of generator

Technical Field

The utility model relates to the technical field of synchronous generators, in particular to a false synchronous test loop of a generator.

Background

After the generator overhauls or the synchronous device and the loop are abnormal, in order to verify the correctness of the synchronous device and the loop, a false synchronous test of the generator should be carried out before the generator is connected, namely, under the condition that a generator isolating switch is disconnected, a power station monitoring system remotely enables a synchronous generator to be connected with an outlet breaker. When the isolating switch of the generator is at the off position, the remote switch-on interlocking loop of the circuit breaker is not satisfied, and the remote switch-on circuit breaker instruction of the LCU monitoring system cannot be executed. In order to cooperate with the pseudo-synchronous test of the generator, maintenance personnel usually use a shorting wire to short-circuit the contact point at the position of the isolating switch in the remote closing interlocking loop of the circuit breaker (the analog isolating switch is at the closing position), and after the test is completed, the shorting wire is removed, so that the related loop is extremely easy to misunderstand the line and miswire, and meanwhile, the operation personnel cannot intuitively monitor the short-circuit state of the contact point at the position of the isolating switch.

As shown in fig. 1, a schematic diagram of a traditional circuit breaker closing circuit is shown, when a generator is in a pseudo-synchronous test, the actual state of a disconnecting switch is in a split position, contacts 1-2 of a DS disconnecting switch body mechanism in an LS remote closing circuit breaker interlocking circuit are normally open contacts, in order to cooperate with the generator is in a pseudo-synchronous test, maintenance personnel usually short-circuit corresponding terminals of disconnecting switch position contacts in the LS remote closing circuit interlocking circuit by using a shorting wire (simulating the disconnecting switch to be in the closed position), and after the test is completed, the shorting wire is removed.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a false synchronization test loop of a generator, which is added on the basis of a traditional breaker closing loop so as to meet the false synchronization test requirement of the generator.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a false synchronization test loop of generator, including the breaker operation relay CZX normally open contact and the LS remote circuit breaker interlock loop of establishing ties, LS remote circuit breaker interlock loop includes the isolator DS normally open contact and the earthing switch ES normally closed contact of establishing ties, earthing switch ES normally closed contact and the closing coil of circuit breaker CB, breaker operation relay CZX is controlled by unit LCU local cabinet, direct current positive pole KM+ and KM-are connected respectively to breaker operation relay CZX and circuit breaker CB's closing coil both ends, be equipped with 1KLP1 and throw the hard clamp plate of false synchronization test at isolator DS normally open contact both ends, 1KLP1 throws the hard clamp plate of false synchronization test and is the duplex clamp plate, be equipped with 1-2, 3-4 two sets of contacts respectively, 1-2 contacts of 1KLP1 throw the hard clamp plate of false synchronization test connect isolator DS normally open contact both ends, 3-4 contacts access unit LCU local cabinet.

The 3-4 contact of the 1KLP1 pseudo-synchronization test hard pressing plate is connected with the normally closed contact of the disconnecting switch DS in series and then connected into the unit LCU local cabinet.

According to the generator pseudo-synchronization test loop, the switch position contact is isolated in the remote closing interlocking loop of the hard pressing plate switching circuit breaker, so that the forced switching of the switch position contact is realized, the requirement of the generator pseudo-synchronization test is met, meanwhile, the forced switching state of the switch position contact is sent to the unit LCU local cabinet, the short-circuit state of the switch position contact can be monitored, and the switch position contact is used as a locking condition in the generator pseudo-synchronization test logic.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

fig. 1 is a schematic diagram of a conventional circuit breaker closing circuit;

fig. 2 is a schematic diagram of a circuit breaker closing circuit according to the present utility model.

In the figure: LS remote circuit breaker interlocking loop, disconnecting switch DS, grounding switch ES, 1KLP1 throw false synchronization test hard clamp plate, circuit breaker CB, circuit breaker operation relay CZX, unit LCU local cabinet.

Detailed Description

As shown in fig. 1 and 2, a generator pseudo-synchronous test loop comprises a breaker operation relay CZX normally open contact and an LS remote breaker interlocking loop which are connected in series, wherein the LS remote breaker interlocking loop comprises a disconnecting switch DS normally open contact and a grounding switch ES normally closed contact which are connected in series, the grounding switch ES normally closed contact is connected with a closing coil of a breaker CB, the breaker operation relay CZX is controlled by a unit LCU local cabinet, two ends of the closing coils of the breaker operation relay CZX and the breaker CB are respectively connected with a direct current positive pole km+ and KM-, a 1KLP1 pseudo-synchronous test hard pressing plate is arranged at two ends of the disconnecting switch DS normally open contact, the 1KLP1 pseudo-synchronous test hard pressing plate is a duplex pressing plate, two groups of contacts 1-2 and 3-4 are respectively arranged, the 1-2 contacts of the 1KLP1 pseudo-synchronous test hard pressing plate are connected with two ends of the disconnecting switch DS normally open contact, and the 3-4 contacts are connected into the unit LCU local cabinet.

As shown in the schematic diagram of the closing circuit of the circuit breaker of the utility model (with pseudo-synchronous circuit) in fig. 2, on the basis of fig. 1, a related circuit of a hard pressing plate for a 1KLP1 pseudo-synchronous test is added, and the hard pressing plate is preferably a duplex pressing plate, namely, when two contact points are put into conduction, the two contact points are respectively 1-2 contact points and 3-4 contact points.

The 1 end of the 1KLP1 false-synchronous test hard pressing plate is connected with the 1 end of the contact point of the body mechanism of the DS isolating switch, and the 2 end of the 1KLP1 false-synchronous test hard pressing plate is connected with the 2 end of the contact point of the body mechanism of the DS isolating switch. The forced input of the contact 1-2 of the DS isolating switch body mechanism is realized by inputting the 1KLP1 dummy synchronous test hard pressing plate.

After the 3-4 end of the 1KLP1 false synchronization test hard pressing plate is connected in series with the DS isolating switch body mechanism contact 3-4, the hard pressing plate is connected into the LCU local cabinet of the unit, and the DS isolating switch body mechanism contact 3-4 is a normally closed contact.

When the actual state of the isolating switch is split, a 1KLP1 false synchronization test hard pressing plate is put in, the loop can be conducted, and the interlocking loop of the remote circuit breaker of the local cabinet LS of the unit LCU meets the action of a false synchronization test condition signal of the generator. The hard pressing plate for the false synchronous test of the 1KLP1 is withdrawn, the loop is not conducted, and the interlocking loop of the remote closing breaker of the local cabinet LS of the unit LCU meets the condition signal reset of the false synchronous test of the generator. The signal point can be introduced into the generator pseudo-synchronization test logic and used as one of locking conditions of the generator pseudo-synchronization test logic, when the signal is in the action state, the generator pseudo-synchronization test control command can be issued, and when the signal is in the resetting state, the generator pseudo-synchronization test control command cannot be issued.

The 1KLP1 throw-in synchronous test hard pressing plate is only in a throw-in state when the generator is in a synchronous test, and is in an exit state at other times.

Claims

1. A false synchronous test loop of a generator is characterized in that: the device comprises a breaker operation relay CZX normally open contact and a LS remote breaker interlocking loop which are connected in series, wherein the LS remote breaker interlocking loop comprises a disconnecting switch DS normally open contact and a grounding switch ES normally closed contact which are connected in series, the grounding switch ES normally closed contact and a closing coil of a breaker CB are controlled by a unit LCU local cabinet, two ends of the closing coils of the breaker operation relay CZX and the breaker CB are respectively connected with a direct current positive pole KM+ and a direct current positive pole KM-, a 1KLP1 on-period test hard pressing plate are arranged at two ends of the disconnecting switch DS normally open contact, the 1KLP1 on-period test hard pressing plate is a duplex pressing plate, two groups of contacts 1-2 and 3-4 are respectively arranged, the 1-2 contact of the 1KLP1 on-period test hard pressing plate is connected with two ends of the disconnecting switch DS normally open contact, and the 3-4 contact is connected with the unit LCU local cabinet.

2. The false synchronization test loop of claim 1, wherein the 3-4 contact of the 1KLP1 false synchronization test hard pressing plate is connected with the normally closed contact of the disconnecting switch DS in series and then connected into the LCU local cabinet of the unit.