CN207459716U - The three phases un identical protection device of breaker fail protection can be started - Google Patents

Abstract

The utility model is related to breaker three phases un identical protection technical fields, it is a kind of three phases un identical protection device that can start breaker fail protection, it includes defencive function and realizes circuit and protection act outlet loop, defencive function realizes that circuit includes the normally opened auxiliary contact of negative sequence current relay and time-delay relay coil, split-phase circuit breaker position combined loop, together with the normally opened auxiliary contact of negative sequence current relay are sequentially connected in series with time-delay relay coil, protection act outlet loop includes the normally opened auxiliary contact of time-delay relay and outlet actuating relay, outlet the first normally opened auxiliary contact of actuating relay are electrically connected with circuit breaker mechanism case, outlet the second normally opened auxiliary contact of actuating relay are electrically connected with circuit-breaker failure portection equipment.The utility model is simple in structure, is sent but during breaker tripping in three phases un identical protection action, can start breaker fail protection, and all intervals on operation busbar, ensure the reliable elimination of failure where tripping circuit breaker.

Description

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

technical field

The utility model relates to the technical field of three-phase inconsistency protection of circuit breakers, which is 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 utility model provides a three-phase inconsistency protection device capable of starting circuit breaker failure protection, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of existing three-phase inconsistency protection device after the circuit breaker three-phase inconsistency protection action The circuit breaker failure protection problem cannot be activated.

The technical scheme of the utility model is realized by 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. Both the protection function realization circuit and the protection action outlet circuit are electrically connected between the positive control busbar and the negative pole control busbar. The protection function realization circuit includes a combination circuit of split-phase circuit breaker positions, a negative sequence current relay normally open auxiliary contact and a time delay The relay coil, the positive control busbar are electrically connected to the position combination circuit of the split-phase circuit breaker. The control bus is electrically connected, and the protective action outlet circuit includes a normally open auxiliary contact of a delay relay and an outlet action relay. The positive control bus is electrically connected to the normally open auxiliary contact of the delay relay, and the normally open auxiliary contact of the delay relay is connected to the outlet The action 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 outlet action relay second normally open The open 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 utility model technical scheme:

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 utility model has a reasonable and compact structure and is easy to use. It 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 operate, the circuit breaker failure protection device can be activated to trip all intervals on the operating bus where the circuit breaker is located to ensure reliable elimination of faults.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the circuit connection structure of the best embodiment of the utility model.

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 utility model is not limited by the following examples, and the specific implementation manner can be determined according to the technical scheme of the utility model and actual conditions.

Below in conjunction with embodiment and accompanying drawing, the utility model is 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 utility model solves the problem that the three-phase inconsistency protection of the split-phase circuit breaker is difficult to start the circuit breaker failure protection function in power plants and power grids with a voltage level of 220kV and above. When the three-phase inconsistency protection action is issued, but the circuit breaker refuses to move, it can Start the circuit breaker failure protection device, jump off all intervals on the running bus where the circuit breaker is located, and ensure the 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 function 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 utility model, 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 three-phase inconsistency protection device capable of starting circuit breaker failure protection, characterized in that it includes a protection function realization circuit, a protection action outlet circuit, a positive control busbar and a negative pole control busbar, and the protection function realization circuit and the protection action outlet circuit Electricity equalization is connected between the positive control bus and the negative control bus, 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 delay relay coil, and the positive control bus and the split phase The circuit breaker position combination circuit is electrically connected, the split-phase circuit breaker position combination circuit, the negative sequence current relay normally open auxiliary contact and the time delay relay coil are connected in series in sequence, the time delay relay coil is electrically connected to the negative control bus bar, the protection action The outlet circuit includes the normally open auxiliary contact of the delay relay and the outlet action relay. The positive control bus is electrically connected to the normally open auxiliary contact of the delay relay. The 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 coil of the circuit breaker opening and starting relay in the circuit breaker operation box, and the second normally open auxiliary contact of the outlet action relay is connected to the circuit breaker failure protection The circuit breaker failure protection start relay coil in the device is electrically connected. 2. The three-phase inconsistency protection device capable of starting circuit breaker failure protection according to claim 1, characterized in that the position combination circuit of the split-phase circuit breaker includes a closing normally open contact group and an opening normally open contact group connected in series in sequence. Closed contact group, the positive control bus is electrically connected to the input terminal of the closing normally open contact group, the output terminal of the opening normally closed contact group is electrically connected to the normally open auxiliary contact of the negative sequence current relay, and the closing normally open contact The point group is composed of the circuit breaker phase a normally open auxiliary contact, the circuit breaker phase b normally open auxiliary contact and the circuit breaker c phase normally open auxiliary contact in parallel, and the opening normally closed contact group is composed of the circuit breaker phase a normally closed Auxiliary contacts, circuit breaker b-phase normally closed auxiliary contacts and circuit breaker c-phase normally closed auxiliary contacts are connected in parallel. 3. The three-phase inconsistency protection device capable of starting circuit breaker failure protection according to claim 2, characterized in that the protection function realization circuit also includes a function pressing plate, which is connected in series with the positive control busbar and the closing normally open contact group Between the input terminals of the protection action outlet circuit, the outlet pressure plate is further included, and the outlet pressure plate is connected in series between the positive control bus and the normally open auxiliary contact of the delay relay.