CN111327039A - Circuit breaker anti-tripping circuit - Google Patents
Circuit breaker anti-tripping circuit Download PDFInfo
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- CN111327039A CN111327039A CN202010199410.9A CN202010199410A CN111327039A CN 111327039 A CN111327039 A CN 111327039A CN 202010199410 A CN202010199410 A CN 202010199410A CN 111327039 A CN111327039 A CN 111327039A
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- switching
- relay
- tripping
- branch
- circuit breaker
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/008—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result preventing unsafe switching operations in substations (Schaltfehlerschutz)
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Abstract
The invention discloses an anti-tripping circuit of a circuit breaker, which comprises a hand-closing branch, a remote-closing branch, an anti-tripping branch and an anti-tripping control branch, wherein the hand-closing branch is used for manually operating the switching-on of the 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. When the circuit breaker anti-tripping circuit is used for switching on, for example, the circuit breaker is just switched on a fault line or equipment, and meanwhile, the hand-on or remote-on contact of the switching-on control circuit has faults such as adhesion and the like.
Description
Technical Field
The invention relates to the technical field of breaker opening and closing control, in particular to an anti-tripping circuit of a breaker.
Background
The high-voltage circuit breaker is used as important electrical equipment in a power system, and the normal operation of the circuit breaker and the normal opening and closing operation are very important. Under some circumstances, when the high-voltage circuit breaker is switched on, if the high-voltage circuit breaker is just switched on a fault line and equipment, and due to the reasons of switching-on of a switching-on control loop or adhesion of a remote switching-on joint and the like, after the high-voltage circuit breaker is tripped by a relay protection device, the circuit breaker can be switched on again and tripped again for many times, namely, the phenomenon of 'circuit breaker jumping' is commonly known. In case of a circuit breaker jump failure, the high-voltage circuit breaker can be damaged, and even an explosion accident can occur, so that the stable operation of the whole power system is endangered.
In order to avoid the occurrence of a circuit breaker jump fault, at present, a common circuit breaker manufacturer designs an anti-jump loop in a circuit breaker mechanism, a protection manufacturer also designs the anti-jump loop on a protection device, the two loops have parameter mismatching at the same time, the circuit breaker can cause reclosing to be uncharged at the switching-on position, and a jump monitoring lamp and a closing monitoring lamp are simultaneously on; when a circuit has an instantaneous fault, the protection device normally trips to cut off the fault circuit, and when a circuit breaker reclosing function is switched in, the reclosing can be refused, so that the circuit breaker cannot be reclosed, and the problems of misjudgment and the like are caused to operation and maintenance personnel; in addition, in some anti-tripping loops, because the auxiliary contacts of the circuit breakers of the tripping loops are improperly adjusted (the deflection is too slow), the contacts at the protective outlet are firstly broken to cause the burning-out fault. Therefore, the anti-jumping circuit of the circuit breaker is developed, jumping faults of the circuit breaker are avoided, and normal and reliable operation of the circuit breaker is ensured to be very urgent.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides an anti-tripping circuit of a circuit breaker. The specific technical scheme is as follows:
the anti-tripping circuit of the circuit breaker comprises a hand-in branch, a remote-in branch, an anti-tripping branch and an anti-tripping control branch, wherein the hand-in branch is used for manually operating the circuit breaker to switch on; 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.
In one possible design, the circuit includes: 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.
In one possible design, the remote engaging leg includes: 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.
In one possible design, the anti-bounce leg comprises: one end of the anti-tripping relay voltage coil 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.
In one possible design, the anti-bounce control leg includes: 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.
In one possible design, the voltage of the dc power supply is 220V.
In one possible design, the circuit further includes a breaker auxiliary normally closed contact connected in series between the closing hold relay coil and the closing coil.
In one possible embodiment, the latching contacts of the closing hold relay are connected in parallel to the first group of normally open contacts of the switching-on/switching-off changeover switch.
In one possible design, the normally open contact of the protection tripping outlet relay is connected in series with the protection tripping pressure plate and then connected in parallel with the current self-holding contact of the anti-tripping relay.
The technical scheme of the invention has the following main advantages:
when the breaker is switched on, if a fault line or equipment is just switched on, a contact KT of a protective tripping outlet relay is closed, a current coil KLT.A of the anti-tripping relay is started, and when the breaker is tripped, a current normally-open contact KLT.A2 of the anti-tripping relay is closed, an anti-tripping branch is switched on, a voltage coil KLT.V of the anti-tripping relay is electrified, the voltage of the anti-tripping relay of the branch is self-maintained from a maintaining contact KLT.V2, a normally-closed contact KLT.V1 of the anti-tripping relay connected in series with a switching coil HQ is disconnected, a switching control loop is cut off, if a hand-closing contact ① and ② of a switching-on and switching-off changeover switch QK or a remotely-closing contact KRC of the branch is not opened due to adhesion and the like, the breaker cannot be switched on due to the fact that the switching control loop is disconnected, so that the breaker cannot be switched on, the breaker is switched on, the purpose of preventing the breaker from tripping is achieved, in addition, after the current coil KLT.A of the anti-tripping relay is started, the normally-closing contact KLT.1 is self-closing contact, the breaker is forced to effectively prevent the fault line or the breaker from being damaged, and the auxiliary arc switch outlet.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a circuit diagram of an anti-trip circuit of a circuit breaker according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, 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 accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
An embodiment of the present invention provides an anti-trip circuit for a circuit breaker, as shown in fig. 1, the circuit includes: the switching-on/off switching device comprises a switching-on/off changeover switch QK, an anti-tripping relay KLT, a switching-on maintaining relay KLC, a switching-on coil HQ and a direct-current power supply KM;
one end of a first group of normally open contacts ①, ② of the switching-on and switching-off changeover switch is connected with the positive pole of a direct-current power supply, the other end of the first group of normally open contacts is connected with one end of a voltage normally closed contact KLT.V1 of an anti-tripping relay, the other end of the voltage normally closed contact KLT.V1 of the anti-tripping relay is connected with one end of a coil KLC of a switching-on holding relay, the other end of the coil KLC of the switching-on holding relay is connected with the negative pole of the direct-current power supply through a switching.
One end of a second group of normally open contacts ⑤, ⑥ of the switching-on and switching-off transfer switch is connected with the positive electrode of the direct-current power supply, the other end of the second group of normally open contacts ⑤, ⑥ of the switching-on and switching-off transfer switch is connected with one end of a normally open contact KRC of the remote control switching-on holding relay, the other end of the normally open contact KRC of the remote control switching-on holding relay is connected with one end of a normally closed voltage contact KLT.V1 of.
One end of a voltage coil KLT.V of the anti-tripping relay is connected with one end of a 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-tripping relay is connected with a common end of a current normally open contact KLT.A2 of the anti-tripping relay and a voltage self-holding contact KLT.V2 of the anti-tripping relay, the other common end of the current normally open contact KLT.A2 of the anti-tripping relay and the voltage self-holding contact KLT.V2 of the anti-tripping relay is used as the other end of the anti-tripping branch circuit to be connected with the negative electrode of the direct-current power supply, and the anti-tripping branch.
One end of a current coil KLT.A of the anti-tripping relay is connected with a current self-holding contact KLT.A1 of the anti-tripping relay and a public end of a normally-open contact KT of the protection tripping outlet relay, the current self-holding contact KLT.A1 of the anti-tripping relay and the other public end of the normally-open contact KT of the protection tripping outlet relay are connected with the positive electrode of a direct-current power supply, the other end of the current coil KLT.A of the anti-tripping relay is connected with one end of an auxiliary normally-open contact QF2 for breaking, and the other end of the auxiliary normally-open contact QF2 of the breaker is connected with the negative electrode of the direct-current power. The part of the components forms an anti-trip control branch for switching on the anti-trip branch in the event of a fault.
The switching-on operation of the circuit breaker comprises a switching-on operation mode and a switching-off operation mode, and is completed through a switching-on branch and a switching-off branch respectively.
When the manual operation is switched on, after the change-over switch QK is rotated to a switching-on position, the first group of normally-open contacts ① and ② are closed, the relay coil KLC and the switching-on coil HQ are connected with the direct-current power supply through the voltage normally-closed contact KLT.V1 of the anti-tripping relay, and the switching-on coil HQ is electrified, so that the primary operation mechanism of the circuit breaker is driven, and the switching-on of the circuit breaker is completed.
When the remote control is closed, with the rotatory back to the remote control position of change over switch QK, the normally open contact ⑤ of second group, ⑥ are closed, when carrying out the remote switch-on operation on the background monitoring machine, the normally open contact KRC of remote control combined floodgate holding relay is closed for closing coil HQ gets electricity, thereby drives the operating device of circuit breaker once, accomplishes the combined floodgate of circuit breaker.
The hand-closing branch and the remote-closing branch directly control whether the breaker is closed or not, and the hand-closing branch and the remote-closing branch are collectively called a closing control loop.
In summary, according to the anti-tripping circuit for a circuit breaker provided by the embodiments of the present invention, when the circuit breaker performs a switching operation, if the circuit breaker is just switched on a fault line or a device, the contact KT of the trip protection outlet relay is closed, the current coil klt.a of the anti-tripping relay is started, the trip coil TQ is energized, and the circuit breaker completes a trip, and at the same time, the current normally open contact klt.a2 of the anti-tripping relay is closed, the anti-tripping branch is switched on, the voltage coil klt.v of the anti-tripping relay is energized, the voltage of the anti-tripping relay of the branch is self-maintained from the holding contact klt.v2, the normally closed contact klt.v1 of the anti-tripping relay connected in series with the switching coil HQ is opened, and the switching control loop is cut off.
When the circuit breaker is in a closing operation state, an auxiliary normally open contact QF2 of the circuit breaker is closed, and when a short-circuit fault occurs on a line load side, secondary current from a current transformer is converted into a weak current signal suitable for being collected by a computer through a current converter by microcomputer protection, and then the collection, calculation and output of the secondary protection current are sequentially completed through a CPU unit through filtering and A/D (analog to digital) conversion. And sending an execution command to a corresponding relay, finally protecting the action of the outlet relay, closing a contact KT of the tripping outlet relay, switching on a tripping loop of the circuit breaker, starting a current coil KLT.A of the anti-tripping relay, and self-maintaining a current normally-open contact KLT.A2 of the anti-tripping relay while the TQ is electrified to act. It should be noted that, the current coil klt.a of the trip-proof relay is also the coil of the circuit breaker trip holding relay, and is located in the microcomputer protection measurement and control device.
Further, the anti-tripping circuit of the circuit breaker provided by the embodiment of the invention further comprises an auxiliary normally closed contact QF1 of the circuit breaker, which is connected in series between the closing holding relay coil KLC and the closing coil HQ. Through setting up the supplementary normally closed contact QF1 of circuit breaker, after the circuit breaker closing, come the circuit breaker control circuit that closes a floodgate, make circuit breaker closing coil HQ lose the electricity, prevent that the coil from getting electricity for a long time and being burnt out.
Further, in the anti-tripping circuit of the circuit breaker provided by the embodiment of the 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 switching-on and switching-off changeover switch, when the closing control loop of the circuit breaker is switched on, the coil KLC and the coil HQ of the closing holding relay are electrified, and meanwhile, the self-holding contact KLC1 of the closing holding relay is closed, so that the situation that the contacts ① and ② of the QK or the pulse contact of the KRC return too fast, which possibly causes the failure of the correct action of the closing coil, and the unsuccessful closing is caused is prevented.
Due to the maintenance of the circuit breaker and the requirement of the verification of relay protection, a protective tripping pressure plate LP1 is also connected in series in the protective tripping circuit of the circuit breaker. In the circuit, a normally open contact KT of a protection tripping outlet relay is connected in series with a protection tripping pressure plate LP1 and then is connected in parallel with a current self-holding contact KLT.A1 of an anti-tripping relay.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010199410.9A CN111327039A (en) | 2020-03-20 | 2020-03-20 | Circuit breaker anti-tripping circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010199410.9A CN111327039A (en) | 2020-03-20 | 2020-03-20 | Circuit breaker anti-tripping circuit |
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| Publication Number | Publication Date |
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| CN111327039A true CN111327039A (en) | 2020-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202010199410.9A Pending CN111327039A (en) | 2020-03-20 | 2020-03-20 | Circuit breaker anti-tripping circuit |
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| CN (1) | CN111327039A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260231A (en) * | 2020-08-31 | 2021-01-22 | 深圳供电局有限公司 | Circuit breaker anti-tripping loop |
-
2020
- 2020-03-20 CN CN202010199410.9A patent/CN111327039A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260231A (en) * | 2020-08-31 | 2021-01-22 | 深圳供电局有限公司 | Circuit breaker anti-tripping loop |
| CN112260231B (en) * | 2020-08-31 | 2023-09-12 | 深圳供电局有限公司 | Circuit breaker anti-jump loop |
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