CN112653091B - Locking control loop of circuit breaker - Google Patents
Locking control loop of circuit breaker Download PDFInfo
- Publication number
- CN112653091B CN112653091B CN202011476705.2A CN202011476705A CN112653091B CN 112653091 B CN112653091 B CN 112653091B CN 202011476705 A CN202011476705 A CN 202011476705A CN 112653091 B CN112653091 B CN 112653091B
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- CN
- China
- Prior art keywords
- oil pressure
- operation control
- circuit breaker
- locking
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
-
- 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
Abstract
The invention relates to a circuit breaker locking control loop, and belongs to the technical field of circuit breaker control. The low oil pressure switch contact and the low air pressure switch contact in the circuit breaker locking control loop adopt normally closed points, when low oil pressure or low air pressure occurs, the contact state is converted from the closed points to open points, at the moment, the corresponding locking relay is powered off, the normally open contact of the locking relay which is connected into the operation control loop in series is opened, the corresponding circuit breaker operation control loop is disconnected, and the circuit breaker operation is locked. Therefore, when the closed loop is in virtual connection and disconnection, the closed relay is powered off, and the circuit breaker is closed; when the condition such as the fault of the locking relay element occurs, the locking relay contact is opened, and the operation of the circuit breaker is locked. Therefore, the circuit can effectively solve the problem that the operation control loop cannot be effectively locked under the conditions of loop disconnection, locking relay damage and the like, greatly improves the reliability of the circuit breaker and improves the operation safety of a power grid.
Description
Technical Field
The invention relates to a circuit breaker locking control loop, and belongs to the technical field of circuit breaker control.
Background
The closed loop with low oil pressure, low air pressure and the like in the circuit breaker control loop is used as a necessary loop for realizing safe and reliable operation of the circuit breaker, and the circuit breaker operation loop is provided with a complete functional loop. The low oil pressure switch contact and the low air pressure switch contact adopted by the current circuit breaker control loop are all normally open points, as shown in fig. 1, the low oil pressure switch contact of the PSYA, the PSYB and the PSYC are A, B and C phases respectively, the low air pressure switch contact of the PSYA, the PSYB and the PSYC are all normally open points, the low air pressure switch contact of the GP1A, GP B and the GP1C are A, B and C phases respectively, the GP1A, GP B and the GP1C are all normally open points, when the low oil pressure or the low air pressure occurs in any phase, the contact state of the corresponding phase is converted from the open point to the closed point, at the moment, the corresponding closing low oil pressure locking relay (K5) or the low air pressure locking relay (K6) is excited and electrified, the normally closed contact of the locking relay connected in series to the operation control loop is opened, at the moment, the circuit breaker operation control loop is opened, and the circuit breaker operation is locked. The control loop can realize locking of the breaker operation control loop when low oil pressure and low air pressure occur, but when the locking relay fails or the locking loop breaks, the locking relay cannot be electrified, so that locking of the operation control loop cannot be realized, a fault that the breaker body is opened by mistake due to locking failure of the breaker control loop occurs, safe and reliable operation of a power grid is influenced, and even operation safety of the power grid is ensured.
Disclosure of Invention
The invention aims to provide a circuit breaker locking control loop to solve the problem of low reliability of the existing circuit breaker operation control loop.
The present invention provides a circuit breaker locking control circuit for solving the above technical problems, the locking control circuit comprising:
the locking loop comprises a closing low oil pressure locking branch, a low air pressure locking branch and/or a separating low oil pressure locking branch, each branch comprises a corresponding switch contact and a locking relay which are connected in series, wherein each switch contact adopts a normally closed point, and the separating low oil pressure locking branch comprises a main separating low oil pressure locking branch and a secondary separating low oil pressure locking branch;
the operation control loop comprises a closing operation control loop and a separating operation control loop, and the closing operation control loop and the separating operation control loop are both connected with normally open points of corresponding locking relays in series.
The low oil pressure switch contact and the low air pressure switch contact of the invention are normally closed points, when low oil pressure or low air pressure occurs, the contact state is converted from the closed points to the open points, at the moment, the corresponding latching relay is powered off, the normally open contact of the latching relay which is connected into the operation control loop in series is opened, at the moment, the operation control loop of the circuit breaker is disconnected, and the operation of the circuit breaker is blocked. Therefore, when the closed loop is in virtual connection and disconnection, the closed relay is powered off, and at the moment, the breaker operation control loop is disconnected, and the breaker operation is closed; when the conditions such as the faults of the locking relay elements occur, the contacts of the locking relay are opened, the circuit breaker operation control loop is opened, and the circuit breaker operation is locked. Therefore, the circuit can effectively solve the problem that the operation control loop cannot be effectively locked under the conditions of loop disconnection, locking relay damage and the like, greatly improves the reliability of the circuit breaker and improves the operation safety of a power grid.
Further, the switching-on low oil pressure locking branch circuit comprises switching-on low oil pressure switch contacts and switching-on low oil pressure locking relays of each phase, which are connected in series at two ends of a power supply, and when A, B and C-phase oil pressures are normal, the switching-on low oil pressure switch contacts of each phase are in a normally closed state, and normally open contacts of the switching-on low oil pressure locking relays are connected in series in the switching-on operation control loop.
Further, the opening low oil pressure locking branch comprises opening low oil pressure switch contacts and opening low oil pressure locking relays of each phase connected in series at two ends of the power supply, when A, B and C-phase oil pressure are normal, the opening low oil pressure switch contacts of each phase are in a normally closed state, and normally open contacts of the opening low oil pressure locking relays are connected in series in the opening operation control loop.
Further, the low-pressure locking branch circuit comprises low-pressure switch contacts and a low-pressure locking relay of each phase, wherein the low-pressure switch contacts and the low-pressure locking relay are connected in series at two ends of the power supply, when A, B and C-phase air pressures are normal, the low-pressure switch contacts of each phase are in a normally closed state, and normally open contacts of the low-pressure locking relay are connected in series in the switching-on operation control loop and the switching-off operation control loop.
Further, the switching-on operation control loop comprises A, B and C switching-on operation control branches, and the switching-off operation control loop comprises A, B and C switching-off operation control branches.
Further, in order to better improve the reliability of the circuit breaker, each phase switching-on operation control branch is also connected with a normally closed contact of an auxiliary switch of a corresponding phase, a normally closed contact of an anti-tripping relay and a switching-on coil in series.
Drawings
FIG. 1 is a schematic circuit diagram of a prior art circuit breaker lockout control loop;
FIG. 2 is a schematic circuit diagram of a circuit breaker lockout control loop of the present invention;
FIG. 3 is a schematic view of the contact state of the density meter according to the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
Aiming at the problems that the existing circuit breaker locking control loop is low in reliability and can not effectively lock the switching operation of the circuit breaker under the conditions of circuit disconnection, element (locking relay) damage and the like, the invention provides a novel circuit breaker locking control loop, which is used for adjusting the structure and the function of a low-oil-pressure and low-air-pressure switch in the existing circuit breaker locking control loop, and when the oil pressure of a hydraulic mechanism is low, a contact for reflecting the locking of the low-oil-pressure is closed; the contact state of the air chamber density meter is improved, and when the air chamber density meter is in a low-pressure state, the contact for locking a control loop of the circuit breaker is closed. Because the oil pressure switch selected by the oil pressure state contact is a C-type contact (having a normally open state and a normally closed state), the oil pressure switch is grounded without changing, and the correspondence between the pressure contact and the functional state of the density meter is realized by changing the contact state of the density meter, as shown in fig. 3.
The specific circuit breaker locking control loop is shown in fig. 2, the locking control loop comprises two parts, one part is an operation control loop, the other part is a locking loop, wherein the locking loop comprises a closing low oil pressure locking branch, a low air pressure locking branch and a main (auxiliary) opening low oil pressure locking branch, the closing low oil pressure locking branch comprises a closing low oil pressure switch contact and a closing low oil pressure locking relay K5 which are connected in series at two ends of a power supply, KP3A, KP B and KP3C are A, B and C-phase closing low oil pressure switch contacts respectively, KP3A, KP3B and KP3C are normally closed points, namely, when A, B and C-phase oil pressures are normal, KP3A, KP B and KP3C are normally closed. When the oil pressure of any phase is low, the normally closed point of the corresponding phase is disconnected, so that the closing low oil pressure locking branch is disconnected, the closing low oil pressure locking relay K5 is powered off, the normally open contact of the closing low oil pressure locking relay K5 connected in series in the closing operation control loop is opened, at the moment, the closing operation control loop of the circuit breaker is disconnected, and the closing operation of the circuit breaker is locked, so that closing low oil pressure locking is realized.
Similarly, the main (auxiliary) split-gate low oil pressure locking branch comprises split-gate low oil pressure switch contacts and split-gate low oil pressure locking relays which are connected in series at two ends of a power supply, wherein KP1A, KP B and KP1C are A, B and C-phase split-gate low oil pressure switch contacts respectively, KP1A, KP1B and KP1C are normally closed points, namely, KP3A, KP B and KP3C are normally closed when A, B and C-phase oil pressures are normal. When the oil pressure of any phase is low, the normally closed point of the corresponding phase is disconnected, so that the opening low oil pressure locking branch is disconnected, the opening low oil pressure locking relay is powered off, the normally open contact of the opening low oil pressure locking relay connected in series in the opening operation control loop is opened (only a control loop of closing operation is given in fig. 2, and the opening operation control loop is similar), at the moment, the opening operation control loop of the circuit breaker is disconnected, the opening operation of the circuit breaker is locked, and the opening low oil pressure locking of the circuit breaker is realized.
The low-pressure locking branch circuit can realize locking of a closing operation control loop and locking of a separating brake operation control loop, as shown in fig. 2, the low-pressure locking branch circuit comprises low-pressure switch contacts and a low-pressure locking relay K6 of each phase, which are connected in series at two ends of a power supply, the GP1A, GP B and the GP1C are A, B and C-phase low-pressure switch contacts respectively, and the GP1A, GP B and the GP1C are normally closed points, namely the GP1A, GP1B and the GP1C are normally closed when A, B and C-phase air pressures are normal. When the air pressure of any phase is low, the normally closed point of the corresponding phase is opened, so that the low-air-pressure locking branch is opened, the low-air-pressure locking relay K6 is powered off, the normally open contact of the low-air-pressure locking relay K6 connected in series in the opening/closing operation control loop is opened, the opening/closing operation control loop of the circuit breaker is opened, the opening/closing operation of the circuit breaker is locked, and the opening/closing low-air-pressure locking of the circuit breaker is realized.
The operation control loop comprises a switching-off operation control loop and a switching-on operation control loop, wherein the switching-on operation control loop is as the right half part of fig. 2, each phase A, B and C is provided with a corresponding switching-on operation control branch, taking phase A as an example, a normally closed contact of an auxiliary switch QF1A of phase A, a normally closed contact of an anti-tripping relay KFA of phase A, an on-off coil YC1A of phase A, a normally open contact of a switching-on low oil pressure latching relay K5, a normally open contact of a low air pressure latching relay K6 and the like are connected in series, meanwhile, the branch is also provided with a normally open contact of a close control (on-site) switching-on operation relay K1, a coil of the close control switching-on operation relay K1 is connected in series with the close switching-on loop, the close switching-on switch SM0 is a manual button switch, and after the close switching-on switch SM0 is pressed down, the coil of the close switching-on operation relay K1 is electrified, and the normally open contact of the corresponding K1 is closed.
The low oil pressure switch contact and the low air pressure switch contact adopted by the circuit breaker locking control loop are normally closed points, when low oil pressure or low air pressure occurs, the contact state is converted from the closed points to the open points, at the moment, the corresponding locking relay is powered off, the normally open contact of the locking relay which is connected into the operation control loop in series is opened, at the moment, the circuit breaker operation control loop is disconnected, and the circuit breaker operation is locked. When the closed loop is in virtual connection or broken line, the closed relay is powered off, and the breaker operation control loop is disconnected at the moment, so that the breaker operation is closed; when the conditions such as the faults of the locking relay elements occur, the contacts of the locking relay are opened, the circuit breaker operation control loop is opened, and the circuit breaker operation is locked. Therefore, the circuit can effectively solve the problem that the operation control loop cannot be effectively locked under the conditions of loop disconnection, locking relay damage and the like, greatly improves the reliability of the circuit breaker and improves the operation safety of a power grid.
Claims (6)
1. A circuit breaker lockout control circuit, the lockout control circuit comprising:
the locking loop comprises a closing low oil pressure locking branch, a low air pressure locking branch and/or a separating low oil pressure locking branch, each branch comprises a corresponding switch contact and a locking relay which are connected in series, wherein each switch contact adopts a normally closed point, and the separating low oil pressure locking branch comprises a main separating low oil pressure locking branch and a secondary separating low oil pressure locking branch;
the operation control loop comprises a closing operation control loop and a separating operation control loop, and the closing operation control loop and the separating operation control loop are both connected with normally open points of corresponding locking relays in series.
2. The circuit breaker lockout control circuit of claim 1, wherein the closing low oil pressure lockout branch circuit includes phase closing low oil pressure switch contacts and closing low oil pressure lockout relays connected in series at both ends of a power supply, and when A, B and C phase oil pressures are normal, the phase closing low oil pressure switch contacts are all in a normally closed state, and normally open contacts of the closing low oil pressure lockout relays are connected in series in the closing operation control circuit.
3. The circuit breaker lockout control circuit of claim 1, wherein the split low oil pressure lockout branch circuit includes split low oil pressure switch contacts and a split low oil pressure lockout relay connected in series at both ends of the power supply, each phase of the split low oil pressure switch contacts being normally closed when A, B and C phases of oil pressure are normal, and a normally open contact of the split low oil pressure lockout relay being connected in series in the split operation control circuit.
4. The circuit breaker lockout control circuit of claim 1, wherein the low-pressure lockout branch circuit includes low-pressure switching contacts and a low-pressure lockout relay of each phase connected in series at both ends of the power supply, and when A, B and C phases are normal in pressure, the low-pressure switching contacts of each phase are in a normally closed state, and normally open contacts of the low-pressure lockout relay are connected in series in the closing operation control circuit and the opening operation control circuit.
5. The circuit breaker lockout control circuit of any one of claims 1-4, wherein the closing operation control circuit comprises a A, B and a C closing operation control branch, and wherein the opening operation control circuit comprises a A, B and a C opening operation control branch.
6. The circuit breaker lockout control circuit of claim 5, wherein each phase closing operation control leg is further connected in series with a normally closed contact of an auxiliary switch of the corresponding phase, a normally closed contact of an anti-trip relay, and a closing coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011476705.2A CN112653091B (en) | 2020-12-14 | 2020-12-14 | Locking control loop of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011476705.2A CN112653091B (en) | 2020-12-14 | 2020-12-14 | Locking control loop of circuit breaker |
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| Publication Number | Publication Date |
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| CN112653091A CN112653091A (en) | 2021-04-13 |
| CN112653091B true CN112653091B (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011476705.2A Active CN112653091B (en) | 2020-12-14 | 2020-12-14 | Locking control loop of circuit breaker |
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| CN (1) | CN112653091B (en) |
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| CN112653091A (en) | 2021-04-13 |
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