CN107819325A - The three phases un identical protection device of breaker fail protection can be started - Google Patents

Abstract

The invention relates to the technical field of circuit breaker three-phase inconsistency protection, and is a three-phase inconsistency protection device capable of starting circuit breaker failure protection, which includes a protection function realization circuit and a protection action exit circuit, and the protection function realization circuit includes a negative sequence current relay normal Open auxiliary contacts and time-delay relay coils, split-phase circuit breaker position combination circuit, negative-sequence current relay normally open auxiliary contacts and time-delay relay coils are connected in series in sequence, and the protection action outlet circuit includes time-delay relay normally open auxiliary contacts and the export action relay, the first normally open auxiliary contact of the export action relay is electrically connected to the circuit breaker mechanism box, and the second normally open auxiliary contact of the export action relay is electrically connected to the circuit breaker failure protection device. The invention has a simple structure, and can start the circuit breaker failure protection when the three-phase inconsistency protection action is issued but the circuit breaker refuses to operate, jumping off all intervals on the operating bus where the circuit breaker is located, and ensuring reliable elimination of faults.

Description

Three-phase inconsistency protection device capable of starting circuit breaker failure protection

technical field

The invention relates to the technical field of three-phase inconsistency protection of circuit breakers, and relates to a three-phase inconsistency protection device capable of starting circuit breaker failure protection.

Background technique

At present, power plants and power grids with a voltage level of 220kV and above mostly use split-phase circuit breakers. When the three-phase inconsistent state occurs in the split-phase circuit breaker, the three-phase inconsistent protection generally adopts the three-phase inconsistent protection of the circuit breaker body, and the three-phase inconsistent protection of the circuit breaker body For switching value protection, the return time of the switching value is slow, which cannot meet the requirements for starting the circuit breaker failure protection, and then it is difficult to start the circuit breaker failure protection after the three-phase inconsistency protection action, so the circuit breaker will open when the three-phase inconsistency protection action occurs The refusal of the circuit breaker leads to non-full-phase operation, the failure protection of the circuit breaker cannot be activated, and the fault cannot be removed.

Contents of the invention

The invention provides a three-phase inconsistency protection device capable of starting circuit breaker failure protection. Problem with activating circuit breaker failure protection.

The technical solution of the present invention is achieved through the following measures: a three-phase inconsistency protection device capable of starting circuit breaker failure protection, including a protection function realization circuit, a protection action outlet circuit, a positive control bus and a negative control bus, the protection Both the function realization circuit and the protection action outlet circuit are electrically connected between the positive control busbar and the negative pole control busbar, and the protection function realization circuit includes a split-phase circuit breaker position combination circuit, a negative sequence current relay normally open auxiliary contact and a time delay relay The coil, the positive control busbar are electrically connected to the position combination circuit of the split-phase circuit breaker, the position combination circuit of the split-phase circuit breaker, the normally open auxiliary contact of the negative sequence current relay and the coil of the delay relay are connected in series in sequence, and the coil of the delay relay is connected to the negative control The busbar is electrically connected, and the protective action outlet circuit includes the normally open auxiliary contact of the time delay relay and the outlet action relay. The relay coil is electrically connected, the outlet action relay coil is electrically connected to the negative control busbar, the first normally open auxiliary contact of the outlet action relay is electrically connected to the circuit breaker opening start relay coil in the circuit breaker operation box, and the second is normally open of the outlet action relay The auxiliary contact is electrically connected with the circuit breaker failure protection starting relay coil in the circuit breaker failure protection device.

Below is the further optimization or/and improvement to above-mentioned technical scheme of the invention:

The position combination circuit of the phase-splitting circuit breaker may include the closing normally open contact group and the opening normally closed contact group in series in sequence, the positive control bus bar is electrically connected to the input end of the closing normally open contact group, and the opening normally open contact group is electrically connected. The output terminal of the closed contact group is electrically connected to the normally open auxiliary contact of the negative sequence current relay, and the closing normally open contact group is composed of a normally open auxiliary contact of the circuit breaker phase a, a normally open auxiliary contact of the circuit breaker phase b and a circuit breaker The c-phase normally open auxiliary contacts are connected in parallel, and the opening normally closed contact group is composed of the circuit breaker a-phase normally closed auxiliary contacts, the circuit breaker b-phase normally closed auxiliary contacts and the circuit breaker c-phase normally closed auxiliary contacts in parallel. to make.

The above-mentioned protective function realization circuit may also include a functional pressure plate, which is connected in series between the positive control bus and the input end of the closing normally open contact group, and the protection action outlet circuit also includes an outlet pressure plate, which is connected in series between the positive control bus and the Between the normally open auxiliary contacts of the time delay relay.

The invention has a reasonable and compact structure and is easy to use, and solves the problem that the three-phase inconsistency protection of the split-phase circuit breaker used in power plants and power grids with a voltage level of 220kV and above is difficult to start the circuit breaker failure protection function. When the circuit breaker refuses to move, it can activate the circuit breaker failure protection device, and jump off all the intervals on the running bus where the circuit breaker is located, so as to ensure the reliable elimination of faults.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the circuit connection structure of the preferred embodiment of the present invention.

The codes in the drawings are: +KM is the positive control bus, -KM is the negative control bus, LJ is the negative sequence current relay coil, LJ1 is the normally open auxiliary contact of the negative sequence current relay, TJ is the delay relay coil, TJ1 TF is the normally open auxiliary contact of the delay relay, TF is the coil of the export action relay, TF1 is the first normally open auxiliary contact of the export action relay, TF2 is the second normally open auxiliary contact of the export action relay, 52A/a is the circuit breaker a Phase normally open auxiliary contact, 52A/b is normally open auxiliary contact of circuit breaker phase b, 52A/c is normally open auxiliary contact of circuit breaker phase c, 52B/a is normally closed auxiliary contact of circuit breaker phase a, 52B /b is the b-phase normally closed auxiliary contact of the circuit breaker, 52B/c is the c-phase normally closed auxiliary contact of the circuit breaker, SB1 is the function pressure plate, SB2 is the outlet pressure plate, TQ is the circuit breaker opening start relay coil, TG is the open circuit Circuit breaker failure protection starting relay coil, 1 is the split-phase circuit breaker position combination circuit, 2 is the circuit breaker operation box, 3 is the circuit breaker failure protection device.

Detailed ways

The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.

Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

As shown in Figure 1, the three-phase inconsistency protection device capable of starting circuit breaker failure protection includes a protection function realization circuit, a protection action outlet circuit, a positive control bus +KM and a negative control bus -KM, and the protection function realization circuit and the protective action outlet circuit are electrically connected between the positive control bus +KM and the negative control bus -KM, and the protection function realization circuit includes the position combination circuit 1 of the split-phase circuit breaker, the normally open auxiliary contact LJ1 of the negative sequence current relay and Time-delay relay coil TJ, positive control busbar +KM are electrically connected to phase-splitting circuit breaker position combination circuit 1, phase-separation circuit breaker position combination circuit 1, negative sequence current relay normally open auxiliary contact LJ1 and time-delay relay coil TJ are connected in series in sequence Together, the time-delay relay coil TJ is electrically connected with the negative control bus-KM, and the protection action outlet circuit includes the time-delay relay normally open auxiliary contact TJ1 and the export action relay, the positive control bus +KM and the delay relay normally open auxiliary The contact TJ1 is electrically connected, the normally open auxiliary contact TJ1 of the delay relay is electrically connected to the coil TF of the export action relay, the coil TF of the export action relay is electrically connected to the negative control bus-KM, and the first normally open auxiliary contact TF1 of the export action relay is connected to The circuit breaker opening and starting relay coil TQ in the circuit breaker operation box 2 is electrically connected, and the second normally open auxiliary contact TF2 of the outlet action relay is electrically connected to the circuit breaker failure protection starting relay coil TG in the circuit breaker failure protection device 3 .

When in use, input A, B, and C three-phase current into the negative sequence current relay coil LJ, when the three phases are inconsistent, a negative sequence current will be generated, so the negative sequence current relay coil is energized, and the negative sequence current relay normally opens the auxiliary contact LJ1 is closed, and at the same time, the position combination circuit 1 of the split-phase circuit breaker is turned on, the delay relay coil TJ is energized, the delay relay normally open auxiliary contact TJ1 is closed, the export action relay coil TF is energized, and the export action relay first normally open Auxiliary contact TF1, the first normally open auxiliary contact TF1 of the outlet action relay closes to energize the circuit breaker opening start relay coil TQ in the circuit breaker operation box 2 to drive the three-phase trip of the circuit breaker, and at the same time the second normal of the outlet action relay Opening the auxiliary contact TF2 and closing the circuit breaker failure protection starting relay coil TG in the circuit breaker failure protection device 3 is energized to start the circuit breaker failure protection device 3, and then the circuit breaker failure protection device 3 judges whether there is current in the circuit breaker, if If there is no current in the circuit breaker, it means that the three-phase trip of the circuit breaker is successful, and the circuit breaker failure protection device 3 does not perform circuit breaker failure protection. If there is current in the circuit breaker, it means that the circuit breaker has not tripped successfully, so the circuit breaker failure protection device 3 Carry out circuit breaker failure protection.

When the three-phase inconsistency disappears, the negative sequence current disappears, the coil LJ of the negative sequence current relay loses power, the normally open auxiliary contact LJ1 of the negative sequence current relay is disconnected, and the position combination circuit 1 of the split-phase circuit breaker is disconnected at the same time, the time delay The relay coil TJ is de-energized, the normally open auxiliary contact TJ1 of the delay relay is disconnected, the coil TF of the export action relay is de-energized, the first normally open auxiliary contact TF1 of the export action relay and the second normally open auxiliary contact TF2 of the export action relay are both Open, thereby stopping the sending circuit breaker trip action and starting the circuit breaker failure protection action.

The invention solves the problem that the three-phase inconsistency protection of the split-phase circuit breaker used in power plants and power grids with a voltage level of 220kV and above is difficult to start the circuit breaker failure protection function. When the three-phase inconsistency protection action is issued, but the circuit breaker refuses to operate, it can start. The circuit breaker failure protection device trips all intervals on the running bus where the circuit breaker is located to ensure reliable elimination of faults.

According to actual needs, the above-mentioned three-phase inconsistency protection device capable of starting circuit breaker failure protection can be further optimized or/and improved:

As shown in Figure 1, the position combination circuit 1 of the split-phase circuit breaker includes the closing normally open contact group and the opening normally closed contact group in series, the positive control bus +KM and the closing normally open contact The input terminal of the group is electrically connected, the output terminal of the opening normally closed contact group is electrically connected with the normally open auxiliary contact LJ1 of the negative sequence current relay, and the closing normally open contact group is composed of the circuit breaker a phase normally open auxiliary contact 52A/ a. The b-phase normally open auxiliary contact 52A/b of the circuit breaker and the c-phase normally open auxiliary contact 52A/c of the circuit breaker are connected in parallel, and the opening normally closed contact group is composed of the a-phase normally closed auxiliary contact 52B/ a. The b-phase normally closed auxiliary contact 52B/b of the circuit breaker and the c-phase normally closed auxiliary contact 52B/c of the circuit breaker are connected in parallel.

When the three-phase inconsistency occurs, the closing normally open contact group is closed, so that the position combination circuit 1 of the split-phase circuit breaker is turned on; when the three-phase inconsistency disappears, the closing normally open contact group is disconnected, so that the split-phase circuit breaker position combination Circuit 1 is disconnected.

As shown in Figure 1, the protection function realization circuit also includes a function pressure plate SB1, which is connected in series between the positive control bus +KM and the input end of the closing and normally open contact group, and the protection action outlet circuit also includes The outlet pressure plate SB2, the outlet pressure plate SB2 is connected in series between the positive control bus +KM and the normally open auxiliary contact TJ1 of the delay relay.

The functional pressing plate SB1 and the outlet pressing plate SB2 here are the existing common knowledge in the field of electric power, which can control the protection function to realize the on-off of the circuit and the protection action outlet circuit. When the three-phase inconsistency occurs, the function pressure plate SB1 and the outlet pressure plate SB2 can be put into the pressure plate to depress the pressure plate, so as to connect the protection function realization circuit and the protection action outlet circuit; when the three-phase inconsistency disappears, the function pressure plate SB1 and the outlet pressure plate SB2 will not be reset. Here, the functional pressure plate SB1 and the outlet pressure plate SB2 are mainly used to meet the needs of the actual operation of the power plant and the power grid. At the same time, a certain circuit can be turned on for calibration during device calibration and maintenance, so as to meet the needs of actual calibration operations and facilitate check.

The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and non-essential technical features can be increased or decreased according to actual needs to meet the needs of different situations.

Claims (3)

1. a kind of three phases un identical protection device that can start breaker fail protection, it is characterised in that realized including defencive function Loop, protection act outlet loop, positive pole control bus and negative pole control bus, the defencive function realize that loop and protection are dynamic Loop is electrically connected between positive pole control bus and negative pole control bus for export, and the defencive function realizes that loop includes dividing Phase circuit breaker position combined loop, the normally opened auxiliary contact of negative sequence current relay and time-delay relay coil, positive pole control bus Electrically connected with split-phase circuit breaker position combined loop, split-phase circuit breaker position combined loop, the normally opened auxiliary of negative sequence current relay Together with contact is sequentially connected in series with time-delay relay coil, time-delay relay coil electrically connects with negative pole control bus, the guarantor Shield action outlet loop include the normally opened auxiliary contact of time-delay relay and outlet actuating relay, positive pole control bus with delay after The normally opened auxiliary contact electrical connection of electrical equipment, the normally opened auxiliary contact of time-delay relay are electrically connected with outlet actuating relay coil, exported Actuating relay coil electrically connects with negative pole control bus, exports the first normally opened auxiliary contact of actuating relay and breaker operator Breaker open operation starting relay coil electrical connection in case, outlet the second normally opened auxiliary contact of actuating relay lose with breaker Breaker fail protection starting relay coil electrical connection in clever protection device.

2. the three phases un identical protection device according to claim 1 that breaker fail protection can be started, it is characterised in that The split-phase circuit breaker position combined loop includes the combined floodgate normally opened contact group and separating brake normally-closed contact group sequentially connected, positive pole control Bus processed electrically connects with the input of combined floodgate normally opened contact group, and the output end and negative sequence current relay of separating brake normally-closed contact group are normal Auxiliary contact electrical connection is opened, combined floodgate normally opened contact group is by the normally opened auxiliary contact of breaker a phases, the normally opened auxiliary contact of breaker b phases It is formed in parallel with the normally opened auxiliary contact of breaker c phases, separating brake normally-closed contact group is by breaker a phases normally closed auxiliary contact, breaker b Phase normally closed auxiliary contact and breaker c phase normally closed auxiliary contacts are formed in parallel.

3. the three phases un identical protection device according to claim 2 that breaker fail protection can be started, it is characterised in that The defencive function realizes that loop also includes function pressing plate, and function pressing plate is connected on positive pole control bus and combined floodgate normally opened contact group Input between, the protection act outlet loop also includes output clamping, output clamping be connected on positive pole control bus and Between the normally opened auxiliary contact of time-delay relay.