CN112600175A - Three-phase inconsistent protection circuit of high-voltage circuit breaker body with voltage of 220kV and above - Google Patents
Three-phase inconsistent protection circuit of high-voltage circuit breaker body with voltage of 220kV and above Download PDFInfo
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- CN112600175A CN112600175A CN202011474936.XA CN202011474936A CN112600175A CN 112600175 A CN112600175 A CN 112600175A CN 202011474936 A CN202011474936 A CN 202011474936A CN 112600175 A CN112600175 A CN 112600175A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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Abstract
The invention relates to a three-phase inconsistent protection circuit of a high-voltage circuit breaker body of 220kV or more, which comprises a control power supply, and a starting circuit, a delay circuit, a tripping circuit and a signal circuit which are connected with the control power supply; the starting loop is formed by connecting normally closed contacts of three-phase auxiliary switches of the circuit breaker in parallel and then connecting the normally closed contacts of the three-phase auxiliary switches of the circuit breaker in series with normally open contacts and a time relay which are connected in parallel; the delay loop is formed by connecting a delay closing contact of a time relay with a three-phase inconsistent protection outlet relay of the body in series; the tripping loop is formed by connecting normally closed contacts of three-phase auxiliary switches of the circuit breaker in parallel and then connecting the normally closed contacts with normally open contacts connected in parallel in series, and then connecting the normally open contacts of the three-phase inconsistent protection outlet relay of the body in series with a tripping coil; the signal loop is that the positive terminal of the measurement and control device passes through another normally open contact of the three-phase inconsistent protection outlet relay of the body to the negative terminal. The invention is suitable for the breaker body of the domestic existing high-voltage and ultrahigh-voltage large-scale power transmission substation, has wide application range and has stronger counter measure mechanism and loop fault monitoring function.
Description
Technical Field
The invention relates to the technical field of circuit breaker protection, in particular to a three-phase inconsistent protection circuit of a high-voltage circuit breaker body of 220kV or more.
Background
The inconsistent three-phase protection of the circuit breaker aims to prevent zero sequence and negative sequence components which occur in the non-full-phase operation of the circuit breaker with the voltage class of 220kV or above due to manual operation or automatic reclosing failure in a single-trip single-weight mode and the like from damaging electrical equipment and causing great influence on the safe and stable operation of a power transmission network. At present, the electric power system generally adopts the inconsistent protection of circuit breaker three-phase, including the inconsistent protection of circuit breaker body three-phase and the inconsistent protection of circuit breaker protection device three-phase.
Because the three-phase inconsistent protection of the breaker body runs for a long time under outdoor severe weather conditions, the three-phase inconsistent protection of the breaker body can be mistakenly operated due to oxidation of contacts of the outlet relay and shaking of the contacts; the secondary insulation resistance of the starting circuit and the delay circuit is protected from aging due to three-phase inconsistency of the circuit breaker body, so that the starting circuit and the delay circuit are started by mistake and are exported, and equipment is stopped; in addition, for a working site, all relays of the three-phase inconsistent protection circuit of the main body are exposed on a panel of the control box, effective anti-misoperation measures are not provided, and equipment outage accidents caused by misoperation of the three-phase inconsistent relays of the breaker main body due to mistaken touch of workers are frequently generated in the equipment maintenance process.
Disclosure of Invention
In order to solve the problems, the invention provides a three-phase inconsistent protection circuit of a high-voltage circuit breaker body of 220kV or more.
The technical scheme adopted by the invention is as follows:
a three-phase inconsistent protection circuit of a high-voltage circuit breaker body of 220kV or more comprises a control power supply, a starting circuit, a delay circuit, a tripping circuit and a signal circuit, wherein the starting circuit, the delay circuit, the tripping circuit and the signal circuit are connected with the control power supply; the starting loop is formed by connecting normally closed contacts of three-phase auxiliary switches of the circuit breaker in parallel and then connecting the normally closed contacts of the three-phase auxiliary switches of the circuit breaker in series with normally open contacts and a time relay which are connected in parallel; the delay loop is formed by connecting a delay closing contact of a time relay with a three-phase inconsistent protection outlet relay of the body in series; the tripping loop is formed by connecting normally closed contacts of three-phase auxiliary switches of the circuit breaker in parallel and then connecting the normally closed contacts with normally open contacts connected in parallel in series, and then connecting the normally open contacts of the three-phase inconsistent protection outlet relay of the body in series with a tripping coil; the signal loop is that the positive terminal of the measurement and control device passes through another normally open contact of the three-phase inconsistent protection outlet relay of the body to the negative terminal.
Preferably, the time relays of the starting circuit are two time relays connected in parallel; and the delay closed contacts of the two time relays are connected in series and then are connected with the three-phase inconsistent protection outlet relay of the body.
Preferably, the three-phase inconsistent protection circuit of the high-voltage circuit breaker body with the voltage of 220kV and above comprises the following protection steps: when the position of a starting loop is not corresponding to that of a circuit breaker, a time relay is started to time after one phase of normally closed contact and the other two phases of normally open contacts are closed; secondly, after the time delay of the time relay KT reaches a setting value, the time delay closing contact of the time relay acts to conduct the three-phase inconsistent protection outlet relay loop of the body, so that the three-phase inconsistent protection outlet relay of the body is excited and acts as an outlet; when three phases of the body are inconsistent, the relay excitation of the protection outlet and the three-phase position of the breaker are inconsistent, and after one phase of normally closed contacts and the other two phases of normally open contacts are closed, the tripping coil is excited to trip the breaker; and fourthly, after the body three-phase inconsistent protection outlet relay is excited, simultaneously, another normally open contact of the signal loop is closed, the positive end of the measurement and control device transmits a signal to the negative end starting signal loop through another normally open contact, and a body three-phase inconsistent protection action signal is transmitted to the monitoring background and the dispatching through the measurement and control device.
Preferably, the two parallel time relays need to be timed simultaneously and reach a setting value, and then the three-phase inconsistent protection outlet relay loop of the body can be conducted, so that the three-phase inconsistent protection outlet relay is excited and acts as an outlet.
The invention has the beneficial effects that:
1. the invention can eliminate the hidden trouble of the original loop, has stronger counter measure capability aiming at the conditions of time relay, three-phase inconsistent protection outlet relay error action of the body, insulation aging, error touch of operation and maintenance personnel and the like, and avoids the occurrence of the conditions on the design of the loop.
2. When the time relay and the body three-phase inconsistent protection outlet relay are in misoperation, the protection action warning signal is transmitted to the monitoring background through the signal loop, and the on-line monitoring effect on the starting loop and the delay loop can be achieved.
3. According to the invention, the time relays of the starting loop are set as the two time relays connected in parallel, so that the problem of malfunction of the three-phase inconsistent protection outlet relay of the body caused by inaccurate timing of the time relays can be solved.
4. The loop design of the invention is simple and clear, and is easy to modify and improve at a later stage.
5. The design loop of the invention does not bring any hidden danger and risk.
6. By the invention, when the breaker does not operate in full phase, the three-phase inconsistent protection circuit of the body can reliably and correctly act and trip at the outlet.
Drawings
Fig. 1 is a schematic circuit diagram of a three-phase inconsistent protection design circuit of a conventional circuit breaker body;
FIG. 2 is a schematic circuit diagram of a three-phase non-uniform protection circuit according to the present invention;
fig. 3 is a schematic circuit diagram of a time relay configured as two parallel time relays.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The principle of inconsistent protection of circuit breaker body three-phase does:
the inconsistent protection of circuit breaker body three-phase adopts the parallelly connected back of circuit breaker three-phase auxiliary switch normally closed contact, establish ties with parallelly connected normally open contact again and constitutes the start-up circuit, when the circuit breaker takes place the non-full phase operation, one looks normally closed contact and other two-phase normally open contact are closed after, time relay excitation, its time delay closure contact is closed after time relay time delay 2S, start the inconsistent protection outlet relay of body three-phase, by the contact of the inconsistent protection outlet relay of body three-phase, switch on the trip circuit, the disconnection is still other looks circuit breakers in operation.
The inconsistent protection design return circuit of current circuit breaker body three-phase is shown in figure 1:
inconsistent protection of circuit breaker body three-phase includes: the circuit comprises a starting loop, a delay loop, a tripping loop and a signal loop. Starting a loop: the normally closed contacts S1 of the three-phase auxiliary switch of the circuit breaker are connected in parallel and then connected in series with the normally open contacts S1' connected in parallel to form a starting circuit, when the three-phase positions of the circuit breaker are inconsistent, one phase of the normally closed contacts is conducted with the other two phases of the normally open contacts, and the starting time relay KT times. A time delay loop: the delay closed contact KT 'of the time relay is connected with the outlet relay KC of the three-phase inconsistent protection of the body in series, and when the delay of the time relay KT reaches a setting value of 2S, the delay closed contact KT' acts to conduct the three-phase inconsistent protection outlet relay KC loop of the body, so that the three-phase inconsistent protection outlet relay KC is excited and acts as an outlet. A trip loop: the body three-phase inconsistent normally open contact KC 'of protecting exit relay establishes ties with tripping coil TQ, and after the inconsistent protecting exit relay of three-phase excited, its normally open contact KC' was closed, tripping coil TQ excited, acted on circuit breaker tripping signal return circuit: the positive power end 701 of the measurement and control device is connected to the negative power end 903 through another normally open contact KC' of the three-phase inconsistent protection outlet relay of the body, after the three-phase inconsistent protection outlet relay KC of the body is excited, a signal loop is conducted while tripping, and a three-phase inconsistent protection action signal of the body is sent to a monitoring background and dispatching through the measurement and control device.
The three-phase inconsistent protection action logic of the body is as follows:
normally, when the breaker is stopped, the normally closed contacts S1A, S1B and S1C of the three-phase auxiliary switch of the breaker are in a closed state at the same time, and the normally open contacts S1A ', S1B ' and S1C ' of the three-phase auxiliary switch of the breaker are in an open state at the same time; when the breaker three-phase auxiliary switch is operated, normally closed contacts S1A, S1B and S1C of the breaker three-phase auxiliary switch are in an open state at the same time, and normally open contacts S1A ', S1B ' and S1C ' of the breaker three-phase auxiliary switch are in a closed state at the same time; at the moment, the normally closed and normally open contacts S1 and S1' of the three-phase auxiliary switch of the circuit breaker are in the same position, and the starting circuit cannot be conducted. When the position of one phase of circuit breaker is inconsistent with the positions of other two phases, the starting loop is conducted, the time relay KT is excited, the time delay closing contact KT' is closed after the setting time delay, the three-phase inconsistent protection outlet relay KC of the body is excited to conduct the tripping loop, and the three-phase switch is tripped.
Therefore, the three-phase inconsistent protection of the body has the hidden trouble of malfunction, and the reason is as follows:
firstly, the three-phase inconsistent protection of the circuit breaker body is operated for a long time under outdoor severe weather conditions, the delayed closing contact KT' of the time relay is mistakenly operated, and the contact oxidation and contact jitter of the three-phase inconsistent protection outlet relay KC of the body can cause the three-phase inconsistent protection misoperation of the body. Secondly, due to the fact that insulation resistance of a starting circuit and a secondary circuit of a delay circuit of the three-phase inconsistent protection of the circuit breaker body is aged and insulation to the ground is insufficient, the time relay KT or the three-phase inconsistent protection outlet relay KC of the circuit breaker body is started and acts to be outlet, and equipment is stopped. For operation and maintenance personnel, all relays for three-phase inconsistent protection of the main body are exposed on a panel of the control box, effective measures for preventing mistaken touch are not provided, and equipment shutdown accidents caused by misoperation of the three-phase inconsistent protection outlet relay KC of the breaker main body due to mistaken touch of workers are frequently generated in the equipment maintenance process; and fourthly, in the operation and maintenance process, the time relay KT and the body three-phase inconsistent protection outlet relay KC are required to be subjected to related tests regularly, and the operation equipment is stopped due to the fact that workers mistakenly enter the interval.
As shown in fig. 2, the three-phase inconsistent protection circuit of the high-voltage circuit breaker body of 220kV or more of the present invention includes a control power supply KM, and a start circuit, a delay circuit, a trip circuit, and a signal circuit connected to the control power supply. The setting of the starting loop, the delay loop and the signal loop is the same as that of a three-phase inconsistent protection design loop of the existing circuit breaker body, and the signal loop adopts an independent power supply; the tripping loop is changed into a breaker three-phase auxiliary switch normally closed contact S1 which is connected in parallel and then connected in series with a normally open contact S1 'which is connected in parallel, and then connected in series with a tripping coil TQ through a normally open contact KC' of a body three-phase inconsistent protection outlet relay.
After the trip circuit is changed and improved: when the three-phase positions of the circuit breaker are inconsistent, a starting loop and a delay loop normally act; when the inconsistent protection export relay KC of body three-phase is excited, its normally open contact KC' of concatenating in the tripping circuit is closed back, through circuit breaker three-phase auxiliary switch one-phase normally closed contact and two other two-phase normally open contacts, will control power supply KM positive electricity and switch on to tripping coil TQ, trip the circuit breaker, signal circuit is launched. And secondly, when the three phases of the circuit breaker are consistent, due to the misoperation of the time delay closing contact KT ' of the time relay, the three phases of the body are inconsistent, the normally open contact KC ' of the outlet relay is protected from shaking or mistakenly touched by operation and maintenance personnel, and the normally open contact KC ' connected in the tripping circuit in series is closed. At the moment, the normally closed contact S1 and the normally open contact S1' of the three-phase auxiliary switch of the circuit breaker are not displaced and still in an open state; the positive electricity of the control power supply KM can not be conducted to the tripping coil TQ after the normally open contact KC' of the three-phase inconsistent protection outlet relay of the body is closed, and the effect of preventing misoperation can be achieved.
It should be noted that, at this time, because the three-phase inconsistent protection outlet relay KC of the main body is already activated and the normally open contact KC ″ thereof is already closed, the signal loop can still transmit the signal to the background and dispatch, and the activation signal loop plays a role in monitoring whether the start loop and the delay loop are erroneously activated.
On the basis of the scheme, the single-phase instantaneous fault of the line still exists, the circuit breaker has not yet reached reclosing after single-phase tripping, the reclosing time is generally 1S, and due to the fact that the time relay is inaccurate in timing, three-phase inconsistent protection of the body is led to be exported in advance, and the problem that the circuit breaker is shut down is caused. In order to improve the reliability of three-phase inconsistent protection actions of the body, the misoperation caused by inaccurate timing of the time relay KT is greatly reduced. As shown in fig. 3, the time relay KT of the starting circuit can be set as two time relays KT1 and KT2 which are connected in parallel; and a delay closed contact KT2 'of another time relay is additionally arranged between a delay closed contact KT 1' of the time relay of the delay loop and the three-phase inconsistent protection outlet relay KC of the body.
Under the normal condition of single time relay KT return circuit: when a line has an instantaneous single-phase fault, the three-phase position of the circuit breaker is in an inconsistent state after the line protection device trips in a single phase. Because the inconsistent protection action time of body three-phase is 2S, reclosing time is 1S. Therefore, after 1S of tripping, reclosing action is carried out and the tripping-phase circuit breaker is reclosed, the three-phase position of the circuit breaker is recovered to the same-phase closing position of the three phases, the inconsistent protection of the three phases of the circuit breaker is restored at the moment, and the circuit breaker still operates normally. Under the condition that the time relay is inaccurate in timing: the circuit breaker operating cycle is about 24 years, and time span is too big in this cycle, because time relay is in the operation in the environment that outdoor temperature difference is big, humidity is big for a long time again, appears often in the actual operation because of the inconsistent protection export relay KC malfunction of time relay KT timing leads to the body three-phase in the inaccurate, causes the condition that the circuit breaker stopped operating. The operating logic for the false action condition is as follows: when the transient single-phase fault of the circuit, after the single-phase tripping of the circuit protection device, the three-phase position of the circuit breaker is in an inconsistent state, and because the KT of the time relay is inaccurate in timing, the circuit breaker acts under the condition of less than or equal to 1S, the reclosing is caused to have not yet reached the three-phase tripping of the circuit breaker which trips to the open phase in a reclosing mode. At the moment, because the three phases of the circuit breaker are all in the separating position, the circuit breaker is reclosed and discharged, a reclosing command is not sent any more, and the circuit breaker is stopped.
After the time relay KT is set into two time relays KT1 and KT2 which are connected in parallel: when leading to the maloperation because of the time relay timing is inaccurate, time relay KT1 and KT2 must be inaccurate just can switch on the time delay return circuit simultaneously in timing to start the inconsistent protection outlet relay KC of body three-phase, very big reduction the possibility of maloperation.
The possibility of action rejection, the correct action of the three-phase inconsistent protection outlet relay KC of the body must depend on the time relays KT1 and KT2 to simultaneously and correctly act, and the action rejection of one time relay can cause the action rejection of the three-phase inconsistent protection outlet relay KC of the body. But each circuit breaker three-phase inconsistent protection has three sets in total, including: the three-phase inconsistent protection in the circuit breaker protection device and the three-phase inconsistent protection of the main body of the two sets in the circuit breaker control box. In actual operation, the condition of refusing action hardly occurs, even in an extreme condition, one set of refusing action does not influence the correct action of the other two sets of protection. In actual operation, the three phases of the multi-shot breaker body are inconsistent to protect the condition of misoperation. Therefore, the problem to be solved is that the power supply reliability is reduced due to misoperation and negative influence is brought to safe and stable operation of the power grid.
Although one time relay is additionally arranged in the design of the circuit, the possibility of three-phase inconsistent protection misoperation caused by inaccurate timing of the time relay can be solved to a great extent.
Claims (4)
1. The utility model provides a high voltage circuit breaker body three-phase inconsistent protection return circuit of 220kV and above which characterized in that: the three-phase inconsistent protection circuit of the high-voltage circuit breaker body with the voltage of 220kV or more comprises a control power supply, and a starting circuit, a delay circuit, a tripping circuit and a signal circuit which are connected with the control power supply; the starting loop is formed by connecting normally closed contacts of three-phase auxiliary switches of the circuit breaker in parallel and then connecting the normally closed contacts of the three-phase auxiliary switches of the circuit breaker in series with normally open contacts and a time relay which are connected in parallel; the delay loop is formed by connecting a delay closing contact of a time relay with a three-phase inconsistent protection outlet relay of the body in series; the tripping loop is formed by connecting normally closed contacts of three-phase auxiliary switches of the circuit breaker in parallel and then connecting the normally closed contacts with normally open contacts connected in parallel in series, and then connecting the normally open contacts of the three-phase inconsistent protection outlet relay of the body in series with a tripping coil; the signal loop is that the positive terminal of the measurement and control device passes through another normally open contact of the three-phase inconsistent protection outlet relay of the body to the negative terminal.
2. The 220kV and above high-voltage circuit breaker body three-phase inconsistent protection circuit of claim 1, wherein: the time relays of the starting loop are two time relays connected in parallel; and the delay closed contacts of the two time relays are connected in series and then are connected with the three-phase inconsistent protection outlet relay of the body.
3. The 220kV and above high-voltage circuit breaker body three-phase inconsistent protection circuit of claim 1, wherein: the method comprises the following protection steps:
when the position of a starting loop is not corresponding to that of a circuit breaker, a time relay is started to time after one phase of normally closed contact and the other two phases of normally open contacts are closed;
secondly, after the time delay of the time relay KT reaches a setting value, the time delay closing contact of the time relay acts to conduct the three-phase inconsistent protection outlet relay loop of the body, so that the three-phase inconsistent protection outlet relay of the body is excited and acts as an outlet;
when three phases of the body are inconsistent, the relay excitation of the protection outlet and the three-phase position of the breaker are inconsistent, and after one phase of normally closed contacts and the other two phases of normally open contacts are closed, the tripping coil is excited to trip the breaker;
and fourthly, after the body three-phase inconsistent protection outlet relay is excited, simultaneously, another normally open contact of the signal loop is closed, the positive end of the measurement and control device transmits a signal to the negative end starting signal loop through another normally open contact, and a body three-phase inconsistent protection action signal is transmitted to the monitoring background and the dispatching through the measurement and control device.
4. The 220kV and above high-voltage circuit breaker body three-phase inconsistent protection circuit of claim 2, wherein: the two parallel time relays need to be timed at the same time and reach setting values, and then a three-phase inconsistent protection outlet relay loop of the body can be conducted, so that the three-phase inconsistent protection outlet relay is excited and acts as an outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011474936.XA CN112600175A (en) | 2020-12-14 | 2020-12-14 | Three-phase inconsistent protection circuit of high-voltage circuit breaker body with voltage of 220kV and above |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011474936.XA CN112600175A (en) | 2020-12-14 | 2020-12-14 | Three-phase inconsistent protection circuit of high-voltage circuit breaker body with voltage of 220kV and above |
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| Publication Number | Publication Date |
|---|---|
| CN112600175A true CN112600175A (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011474936.XA Withdrawn CN112600175A (en) | 2020-12-14 | 2020-12-14 | Three-phase inconsistent protection circuit of high-voltage circuit breaker body with voltage of 220kV and above |
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| CN (1) | CN112600175A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928916A (en) * | 2014-04-11 | 2014-07-16 | 国家电网公司 | Three-phase inconsistency protection circuit of circuit breaker |
| CN107959280A (en) * | 2017-12-28 | 2018-04-24 | 贵州电网有限责任公司 | A kind of breaker body three phases un identical protection circuit and control method |
| CN111060803A (en) * | 2019-12-10 | 2020-04-24 | 中国长江电力股份有限公司 | Circuit breaker tripping and closing circuit full-working-condition monitoring circuit |
| CN211830195U (en) * | 2020-03-25 | 2020-10-30 | 云南电网有限责任公司曲靖供电局 | High-voltage circuit breaker body three-phase inconsistent protection circuit |
-
2020
- 2020-12-14 CN CN202011474936.XA patent/CN112600175A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928916A (en) * | 2014-04-11 | 2014-07-16 | 国家电网公司 | Three-phase inconsistency protection circuit of circuit breaker |
| CN107959280A (en) * | 2017-12-28 | 2018-04-24 | 贵州电网有限责任公司 | A kind of breaker body three phases un identical protection circuit and control method |
| CN111060803A (en) * | 2019-12-10 | 2020-04-24 | 中国长江电力股份有限公司 | Circuit breaker tripping and closing circuit full-working-condition monitoring circuit |
| CN211830195U (en) * | 2020-03-25 | 2020-10-30 | 云南电网有限责任公司曲靖供电局 | High-voltage circuit breaker body three-phase inconsistent protection circuit |
Non-Patent Citations (1)
| Title |
|---|
| 江知瀚 等: "断路器三相不一致保护可靠性分析及二次回路改进", 《电力系统自动化》 * |
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