CN111327039A - circuit breaker anti-jump circuit - Google Patents

Abstract

The invention discloses an anti-jump circuit for a circuit breaker. The anti-jump circuit includes a hand-closing branch, a remote-closing branch, an anti-jumping branch and an anti-jumping control branch. The hand-closing branch is used for manually operating a circuit breaker. closing; the remote closing branch is used to remotely operate the circuit breaker to close; the anti-jump branch is used to cut off the manual closing branch and the remote closing branch; the anti-jump control branch, It is used to control whether the anti-jump branch works. The anti-jump circuit of the circuit breaker of the present invention, when the closing operation is performed, if it happens to be closed on the faulty line or equipment, and at the same time the closing control circuit manual or remote closing contacts are stuck and other faults, the circuit breaker can prevent the trip through the circuit breaker. The circuit can prevent the "breaker jumping" fault, achieve the purpose of preventing the circuit breaker from jumping, and ensure the normal operation and reliable closing of the circuit breaker.

Description

circuit breaker anti-jump circuit

technical field

The invention relates to the technical field of circuit breaker opening and closing control, in particular to an anti-jump circuit of a circuit breaker.

Background technique

As an important electrical equipment in the power system, the high-voltage circuit breaker is very important for the normal operation of the circuit breaker and the normal opening and closing work. In some cases, when the high-voltage circuit breaker is closed, for example, it happens to be closed on the faulty line and equipment, and due to reasons such as the hand-closing or remote-closing contact adhesion of the closing control circuit, after the relay protection device trips the high-voltage circuit breaker, the circuit is opened. The circuit breaker will reclose and trip again many times, which is commonly known as the phenomenon of "circuit breaker jumping". Once the circuit breaker jumping fault occurs, the high-voltage circuit breaker will be damaged, and even an explosion accident will occur, endangering the stable operation of the entire power system.

In order to avoid circuit breaker jumping faults, at present, the general circuit breaker manufacturers design an anti-jump circuit in the circuit breaker mechanism, and the protection manufacturer also designs an anti-jump circuit on the protection device. When the circuit breaker is in the closing position, the recloser may not be charged, and the jumping position and closing position monitoring lights will be on at the same time; when an instantaneous fault occurs in the line, the protection device normally trips to cut off the faulty line. Refusing to operate, the circuit breaker cannot be reclosed, causing misjudgment by the operation and maintenance personnel; and some anti-jump circuits are due to improper adjustment of the auxiliary contacts of the circuit breaker in the trip circuit (the displacement is too slow), which causes the protection outlet contacts to break the arc first. Burn out failure. Therefore, it is very urgent to develop an anti-jump circuit for circuit breakers to avoid jumping faults of circuit breakers and ensure normal and reliable operation of circuit breakers.

SUMMARY OF THE INVENTION

In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides an anti-jump circuit of a circuit breaker. The specific technical solutions are as follows:

An anti-jump circuit for a circuit breaker, the anti-jump circuit includes a hand-closing branch, a remote-closing branch, an anti-jumping branch and an anti-jumping control branch, and the hand-closing branch is used for manually operating the circuit breaker to close; The remote closing branch is used to remotely operate the circuit breaker to close; the anti-jump branch is used to cut off the manual closing branch and the remote closing branch; the anti-jump control branch is used to control the Whether the anti-jump branch is active.

In a possible design, the circuit includes: an opening and closing transfer switch, an anti-jump relay, a closing holding relay, a closing coil, and a DC power supply; the anti-jump relay is a double-coil relay, and the current coil has the ability to start The voltage coil has a self-holding function; the hand-closing branch includes: one end of the first group of normally open contacts of the on-off switch is connected to the positive pole of the DC power supply, and the other end is connected to the voltage of the anti-jump relay One end of the normally closed contact, the other end of the voltage normally closed contact of the anti-jump relay is connected to one end of the coil of the closing holding relay, and the other end of the coil of the closing holding relay is connected to the DC through the closing coil Negative power supply.

In a possible design, the remote closing branch includes: one end of the second group of normally open contacts of the opening and closing transfer switch is connected to the positive pole of the DC power supply, and the other end is connected to the remote control closing holding relay One end of the normally open contact, and the other end of the normally open contact of the remote control closing and holding relay is connected to one end of the voltage normally closed contact of the anti-jump relay.

In a possible design, the anti-jump branch circuit includes: one end of the voltage coil of the anti-jump relay is connected to the other end of the first group of normally open contacts of the transfer switch; the other end of the voltage coil of the anti-jump relay is connected. One end is connected to a common terminal of the current normally open contact of the anti-jump relay and the voltage self-holding contact of the anti-jump relay, and the current normally open contact of the anti-jump relay and the voltage self-holding contact of the anti-jump relay are The other common terminal is connected to the negative pole of the DC power supply as the other terminal of the anti-jump branch.

In a possible design, the anti-jump control branch includes: one end of the current coil of the anti-jump relay is connected to the common terminal of the current self-holding contact of the anti-jump relay and the normally open contact of the protection trip outlet relay , the current self-holding contact of the anti-jump relay and the other common terminal of the normally open contact of the protection tripping outlet relay are connected to the positive pole of the DC power supply; the other end of the current coil of the anti-jump relay is connected to the auxiliary circuit breaker One end of the normally open contact and the other end of the auxiliary normally open contact of the circuit breaker are connected to the negative pole of the DC power supply through the opening coil.

In one possible design, the voltage of the DC power supply is 220V.

In a possible design, the circuit further includes a circuit breaker auxiliary normally closed contact connected in series between the closing holding relay coil and the closing coil.

In a possible design, the self-holding contact of the closing-holding relay is connected in parallel with the first group of normally open contacts of the opening-closing transfer switch.

In a possible design, the normally open contact of the protection trip outlet relay is connected in series with the protection trip pressure plate and then connected in parallel with the current self-holding contact of the anti-jump relay.

The main advantages of the technical solution of the present invention are as follows:

In the anti-trip circuit of the circuit breaker of the present invention, when the circuit breaker performs the closing operation, if the circuit breaker is just closed to the faulty line or equipment, the contact KT of the protection trip outlet relay is closed, and the current coil KLT.A of the anti-trip relay is activated. When the circuit breaker trips, the current normally open contact KLT.A2 of the anti-jump relay is closed, and the anti-jump branch is connected, the voltage coil KLT.V of the anti-jump relay is energized, and the voltage of the anti-jump relay of this branch is self-maintaining The contact KLT.V2 is self-retaining, and the normally closed contact KLT.V1 of the anti-jump relay connected in series with the closing coil HQ is disconnected, cutting off the closing control circuit. If the hand-closing contacts ①, ② or the remote-closing contact KRC of the opening and closing transfer switch QK cannot be disconnected due to adhesion and other reasons, and the closing command continues to be issued, the circuit breaker will not be able to close because the closing control circuit has been disconnected. So as to achieve the purpose of anti-jumping of the circuit breaker. In addition, when the current coil KLT.A of the anti-jump relay is activated, its self-holding contact KLT.A1 is closed until it "forces" the normally open auxiliary contact QF2 of the circuit breaker to change position, which effectively prevents the protection outlet contact from breaking the arc first and then Burnout failure occurs. Ensure that the circuit breaker operates normally and closes reliably.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the embodiments of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached image:

FIG. 1 is a circuit diagram of a circuit breaker anti-jump circuit provided by an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

An embodiment of the present invention provides an anti-jump circuit for a circuit breaker, as shown in FIG. 1 , the circuit includes: an opening and closing transfer switch QK, an anti-jump relay KLT, a closing holding relay KLC, a closing coil HQ, a DC power supply KM;

One end of the first group of normally open contacts ① and ② of the opening and closing transfer switch is connected to the positive pole of the DC power supply, and the other end is connected to one end of the voltage normally closed contact KLT.V1 of the anti-jump relay, and the voltage normally closed contact KLT.V1 of the anti-jump relay The other end is connected to one end of the coil KLC of the closing holding relay, and the other end of the coil KLC of the closing holding relay is connected to the negative pole of the DC power supply through the closing coil HQ; this part of the component constitutes a hand-closing branch.

One end of the second group of normally open contacts ⑤ and ⑥ of the opening and closing transfer switch is connected to the positive pole of the DC power supply, and the other end is connected to one end of the normally open contact KRC of the remote control closing and holding relay, and the normally open contact KRC of the remote control closing and holding relay The other end is connected to one end of the voltage normally closed contact KLT.V1 connected to the anti-jump relay; this part of the component constitutes a remote closing branch.

One end of the voltage coil KLT.V of the anti-jump relay is connected to one end of the first group of normally open contacts ① and ② of the transfer switch; the other end of the voltage coil KLT.V of the anti-jump relay is connected to the current normally open contacts KLT.A2 and A common terminal of the voltage self-holding contact KLT.V2 of the anti-jump relay, the other common terminal of the current normally open contact KLT.A2 of the anti-jump relay and the voltage self-holding contact KLT.V2 of the anti-jump relay as the anti-jump branch The other end is connected to the negative pole of the DC power supply; this part of the component constitutes an anti-jump branch.

One end of the current coil KLT.A of the anti-jump relay is connected to the current self-holding contact KLT.A1 of the anti-jump relay and the common terminal of the normally open contact KT of the protection tripping outlet relay, and the current self-holding contact KLT.A1 of the anti-jump relay is connected to the protection The other common end of the normally open contact KT of the trip outlet relay is connected to the positive pole of the DC power supply, the other end of the current coil KLT.A of the anti-jump relay is connected to one end of the circuit breaker auxiliary normally open contact QF2, and the other end of the circuit breaker auxiliary normally open contact QF2 One end is connected to the negative pole of the DC power supply through the opening coil TQ. This part of the component constitutes an anti-jump control branch, which is used to connect the anti-jump branch when a fault occurs.

Among them, the closing operation of the circuit breaker includes two operation modes: manual closing and remote closing, which are respectively completed through the manual closing branch and the remote closing branch.

When manually closing, after rotating the transfer switch QK to the closing position, the first group of normally open contacts ① and ② are closed, and through the voltage normally closed contact KLT.V1 of the anti-jump relay, the closing holding relay coil KLC and closing The coil HQ is connected with the DC power supply, and the closing coil HQ is energized, thereby driving the primary operating mechanism of the circuit breaker to complete the closing of the circuit breaker.

When remote closing, after the transfer switch QK is rotated to the remote control position, the second group of normally open contacts ⑤ and ⑥ are closed. When the remote closing operation is performed on the background monitoring machine, the normally open contact KRC of the remote control closing holding relay is closed. , so that the closing coil HQ is energized, thereby driving the primary operating mechanism of the circuit breaker to complete the closing of the circuit breaker.

Among them, the manual closing branch and the remote closing branch directly control whether the circuit breaker is closed, and the two are collectively referred to as the closing control circuit.

To sum up, in the circuit breaker anti-tripping circuit provided by the embodiment of the present invention, when the circuit breaker performs the closing operation, if the circuit breaker is just closed to the faulty line or equipment, the contact KT of the protection tripping outlet relay is closed, and the anti-jumping relay is closed. The current coil KLT.A starts, the trip coil TQ is energized, and the circuit breaker completes the trip; at the same time, the current normally open contact KLT.A2 of the anti-jump relay is closed, the anti-jump branch is connected, and the voltage coil of the anti-jump relay is closed. When KLT.V is energized, the voltage self-holding contact KLT.V2 of the anti-jump relay of this branch is self-holding, and the normally closed contact KLT.V1 of the anti-jump relay connected in series with the closing coil HQ is disconnected, cutting off the closing control loop. If the manual closing contacts ①, ② contacts or the remote closing contact KRC of the opening and closing transfer switch QK cannot be disconnected due to adhesion and other reasons, and the closing command continues to be issued, the circuit breaker will not be able to close because the closing control circuit has been disconnected. , so as to achieve the purpose of anti-jumping of the circuit breaker. In addition, when the current coil KLT.A of the anti-jump relay is activated, its self-holding contact KLT.A1 is closed until it "forces" the normally open auxiliary contact QF2 of the circuit breaker to change position, which effectively prevents the protection outlet contact from breaking the arc first and then Burnout failure occurs. Ensure that the circuit breaker operates normally and closes reliably.

Among them, when the circuit breaker is in the closed operation state, the auxiliary normally open contact QF2 of the circuit breaker is closed. When the line load side encounters a short-circuit fault, the microcomputer protection transfers the secondary current from the current transformer to the current converter. Convert it into a weak current signal suitable for computer acquisition, and then complete the acquisition, calculation and output of the secondary protection current through the CPU unit through filtering and A/D digital-to-analog conversion. Send an execution command to the corresponding relay, and finally the protection outlet relay acts, the contact KT of the protection trip outlet relay is closed, the circuit breaker tripping circuit is connected, and the current coil KLT.A of the anti-jump relay will be activated. The current normally open contact KLT.A2 of the jump relay is self-retaining. It should be noted that the current coil KLT.A of the anti-jump relay is also the coil of the circuit breaker trip holding relay, which is located in the microcomputer protection measurement and control device.

Further, the circuit breaker anti-tripping circuit provided by the embodiment of the present invention further includes a circuit breaker auxiliary normally closed contact QF1 connected in series between the closing holding relay coil KLC and the closing coil HQ. By setting the auxiliary normally closed contact QF1 of the circuit breaker, after the closing of the circuit breaker is completed, the closing control circuit of the circuit breaker is cut off, so that the closing coil HQ of the circuit breaker is de-energized, so as to prevent the coil from being burned out when it is energized for a long time.

Further, in the circuit breaker anti-jump circuit provided by the embodiment of the present invention, the self-holding contact KLC1 of the closing holding relay is connected in parallel with the first group of normally open contacts ① and ② of the opening and closing transfer switch. When the closing control circuit of the circuit breaker is turned on, and both the closing holding relay coil KLC and the closing coil HQ are energized, the self-holding contact KLC1 of the closing holding relay is closed to prevent the ① and ② contacts of QK or the pulse contact of KRC from returning Too fast may cause the closing coil to fail to act correctly, resulting in unsuccessful closing.

Due to the needs of the maintenance of the circuit breaker and the verification of the relay protection, a protection trip pressure plate LP1 is also connected in series in the circuit breaker protection trip circuit. In the circuit, the normally open contact KT of the protection tripping outlet relay is connected in series with the protection tripping pressure plate LP1 and then connected in parallel with the current self-holding contact KLT.A1 of the anti-jump relay.

It should be noted that, in this document, relational terms such as "first" and "second" etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. In addition, the "front", "rear", "left", "right", "upper" and "lower" herein are all referred to the placement state shown in the accompanying drawings.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. The anti-tripping circuit of the circuit breaker is characterized by comprising a hand-in branch, a remote-in branch, an anti-tripping branch and an anti-tripping control branch;

the manual switching branch is used for switching on a manually operated circuit breaker;

the remote switching-on branch is used for switching on a remote control operation circuit breaker;

the anti-jumping branch is used for cutting off the hand-closing branch and the remote-closing branch;

and the anti-jump control branch is used for controlling whether the anti-jump branch acts or not.

2. The circuit breaker trip prevention circuit of claim 1, wherein the circuit comprises: the switching-on/off switching-off device comprises a switching-on/off transfer switch, an anti-tripping relay, a switching-on maintaining relay, a switching-on coil and a direct-current power supply; the anti-tripping relay is a double-coil relay, the current coil has a starting function, and the voltage coil has a self-holding function;

the hand is closed the branch road and is included: one end of a first group of normally open contacts of the switching-on and switching-off transfer switch is connected with the anode of the direct-current power supply, the other end of the first group of normally open contacts of the switching-on and switching-off transfer switch is connected with one end of a voltage normally closed contact of the tripping-prevention relay, the other end of the voltage normally closed contact of the tripping-prevention relay is connected with one end of a coil of the switching-on holding relay, and the other end of the coil of the switching-on holding relay is connected with.

3. The circuit breaker trip prevention circuit of claim 2, wherein the trip leg comprises: one end of a second group of normally open contacts of the switching-on and switching-off transfer switch is connected with the anode of the direct-current power supply, the other end of the second group of normally open contacts of the switching-on and switching-off transfer switch is connected with one end of the normally open contacts of the remote control switching-on and switching-off holding relay, and the other end of the normally open contacts of the remote control switching-on and switching-off holding relay is connected with one end.

4. The circuit breaker anti-trip circuit of claim 3, wherein the anti-trip branch comprises: one end of a voltage coil of the anti-tripping relay is connected with the other end of the first group of normally open contacts of the change-over switch; the other end of the voltage coil of the anti-tripping relay is connected with a common end of the current normally open contact of the anti-tripping relay and the voltage self-holding contact of the anti-tripping relay, and the other common end of the current normally open contact of the anti-tripping relay and the other common end of the voltage self-holding contact of the anti-tripping relay are used as the other end of the anti-tripping branch and connected with the negative electrode of the direct-current power supply.

5. The circuit breaker anti-trip circuit of claim 4, wherein the anti-trip control branch comprises:

one end of a current coil of the anti-tripping relay is connected with a common end of a current self-holding contact of the anti-tripping relay and a normally open contact of the protective tripping outlet relay, and the current self-holding contact of the anti-tripping relay and the other common end of the normally open contact of the protective tripping outlet relay are connected with the anode of the direct-current power supply; the other end of the current coil of the anti-tripping relay is connected with one end of an auxiliary normally open contact of the circuit breaker, and the other end of the auxiliary normally open contact of the circuit breaker is connected with the negative electrode of the direct-current power supply through a brake separating coil.

6. The circuit breaker trip prevention circuit of claim 5 wherein the voltage of the DC power source is 220V.

7. The circuit breaker trip prevention circuit of claim 5 further comprising a breaker auxiliary normally closed contact connected in series between the close hold relay coil and the close coil.

8. The circuit breaker trip prevention circuit of claim 5 wherein the latching contacts of the close hold relay are connected in parallel with the first set of normally open contacts of the switch-on/off transfer switch.

9. The circuit breaker trip prevention circuit of claim 5 wherein the normally open contact of the protective trip exit relay is connected in series with the protective trip pressure plate and then connected in parallel with the current self-holding contact of the trip prevention relay.

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