CN220964323U - Charging protection circuit of manual relay - Google Patents
Charging protection circuit of manual relay Download PDFInfo
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- CN220964323U CN220964323U CN202322537558.0U CN202322537558U CN220964323U CN 220964323 U CN220964323 U CN 220964323U CN 202322537558 U CN202322537558 U CN 202322537558U CN 220964323 U CN220964323 U CN 220964323U
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Abstract
The utility model discloses a charging protection loop of a manual relay, and particularly relates to the technical field of power grid control and scheduling, comprising a detection module, a judgment module and a protection module; the detection module is used for receiving the fault current of the bus and converting the fault current into a first signal to be sent to the judgment module; the judging module is used for judging the fault type of the bus and converting the fault type into a second signal and sending the second signal to the protection module; the protection module is used for receiving the second signal sent by the judging module and cutting off the bus-tie switch through charging to the dead zone logic differential protection; according to the utility model, the busbar switch is tripped through the protection of the dead zone by charging the busbar, so that other outgoing lines of the busbar are prevented from tripping due to differential motion, the effective protection of the charging process is realized, the problem of the fault of the dead zone during charging is solved, the operation is convenient during maintenance, the occurrence of hidden danger and the expansion of accidents are avoided, and the safe and stable operation of a power grid is ensured.
Description
Technical Field
The utility model relates to the technical field of power grid control and dispatching, in particular to a charging protection loop of a manual relay.
Background
At present, with the development of power grid control and dispatching technology, the bus protection device mainly comprises a single bus, a single bus section, a double bus single section and a double bus double section main wiring mode, and can realize the functions of bus differential protection, breaker failure protection, bus connection failure protection and bus connection dead zone protection.
The existing bus-tie dead zone protection mainly realizes the function by delaying the tripping of the other bus under the condition that the bus-tie switch is tripped and the bus-tie CT still has current and the large-differential-ratio differential element and the breaker-side small-differential-ratio differential element do not return after the tripping of the differential protection bus.
However, in practical use, there are still some drawbacks, such as for conventional bus protection logic, when the bus is charged to dead space fault and the bus CT is close to the passive bus, no fault current flows through the bus CT, the differential protection cannot be locked and the bus switch is turned off by starting the charging protection, and the differential protection will cut off the running bus.
Disclosure of utility model
In order to overcome the above-mentioned drawbacks of the prior art, an embodiment of the present utility model provides a charging protection circuit of a manual relay, which solves the problems set forth in the above-mentioned background art through the following schemes.
In order to achieve the above purpose, the present utility model provides the following technical solutions: a charging protection loop of a manual relay comprises a detection module, a judgment module and a protection module.
The detection module is used for detecting the sectional current of the bus, converting the sectional current into a first signal and then sending the first signal to the judgment module;
The judging module is used for judging whether the sectional current of the bus meets the failure mutual starting condition or not, converting the judging result into a second signal and then sending the second signal to the protecting module;
The protection module is used for receiving the second signal sent by the judging module and cutting off all connecting elements on the bus-tie breaker switch and the corresponding bus when the circuit meets the failure mutual starting condition.
Preferably, the detection module includes a resistor unit, an amplifier unit, and a detection circuit P1 connected in sequence.
Preferably, the resistance unit of the detection module includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a resistor R5.
Preferably, the amplifier unit of the detection module includes an amplifier A1 and an amplifier A2.
Preferably, the resistor R2 is connected with the resistor R1 and the negative input end of the amplifier A1, the positive input end of the amplifier A1 is connected with the output end of the amplifier A1, the negative input end of the amplifier A2 is connected with the output end of the amplifier A1, the output end of the amplifier A2 is connected with the resistor R3, the resistor R3 is connected with the resistor R5 and the resistor R4, the first port of the detection circuit P1 is connected with the resistor R4 and the power supply VCC, the third port is connected with the resistor R5, and the fourth port is grounded GND.
Preferably, the judging module includes a judging loop P2.
Preferably, the S port of the judging circuit P2 is connected to the power source VCC, the R port is grounded GND, and the CK port is connected to the second port of the detecting circuit P1.
Preferably, the fault type of the judging module comprises an operation bus, an overhaul bus, a fault current and a closed bus-bar circuit breaker.
Preferably, the protection module includes a protection loop P3.
Preferably, the port A, the port B and the port C of the protection circuit P3 are connected with a power supply VCC, the port D is connected with the port Q of the judgment circuit P2, and the port INH/E\X\P\is connected with the port Q\of the judgment circuit P2, and the port E, the port F, the port G and the port H are grounded to GND.
Preferably, the logic function diagram of the protection module 3 includes a not gate, an or gate, a first and gate, a second and gate, a third and gate, and a fourth and gate that are sequentially connected.
Preferably, the input end of the NOT gate is connected with the jump joint of the bus-tie breaker; the input end of the OR gate is connected with the output end of the NOT gate and the jump bit of the bus-tie circuit breaker; and the input end of the first AND gate is connected with a bus, the current of the bus-bar circuit breaker, the output end of the differential protection device or the OR gate and a charging hand-in contact of the bus-bar circuit breaker.
Preferably, the input end of the second AND gate is connected with the output end of the first AND gate and the current of the bus-bar circuit breaker; the input end of the third AND gate is connected with the large-difference compound ratio differential motion and the output end of the second AND gate, and the output end of the third AND gate is connected with a bus-bar breaker; the input end of the fourth AND gate is connected with the output end of the second AND gate and the charging hand-in contact of the bus-bar breaker, and the output end of the fourth AND gate is connected with the locking differential outlet.
The utility model has the technical effects and advantages that:
The detection module is used for receiving the fault current of the bus and converting the fault current into the first signal to be sent to the judging module, has the advantages of simple structure, high safety, low energy consumption and convenient operation during maintenance, and when a group of buses are in power failure, the loop does not need to be switched.
The dead zone fault generated during charging of the judging module only occurs on the charging side of the current transformer, which is close to the bus to be overhauled, and the charging bus side of the bus sectioning breaker, so that the fault type of the bus differential protection device can be accurately judged;
according to the utility model, the bus-bar switch and the dead zone fault of the protection module are protected by charging, the bus current of the manual relay flows to the fault point, the bus-bar breaker is free from flowing, the fault cannot be removed by charging overcurrent protection, and the bus-bar is charged in the dead zone protection to trip the bus-bar switch, so that other outgoing lines of the bus are ensured not to trip due to differential motion, the effective protection of the charging process is realized, and the problem of charging to the dead zone fault is solved.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present utility model.
Fig. 2 is a schematic structural diagram of a detection module 1 according to the present utility model.
Fig. 3 is a schematic structural diagram of a judging module 2 according to the present utility model.
Fig. 4 is a schematic diagram of a fault type structure of the judging module 2 according to the present utility model.
Fig. 5 is a schematic structural diagram of the protection module 3 of the present utility model.
Fig. 6 is a schematic diagram of the logical functional structure of the protection module 3 according to the present utility model.
Fig. 7 is a schematic structural diagram of a complete embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, the embodiment specifically discloses a charging protection circuit of a manual relay, which includes a detection module 1, a judgment module 2 and a protection module 3.
The detection module 1 is used for receiving the fault current of the bus and converting the fault current into a first signal to be sent to the judgment module 2;
the judging module 2 is used for judging the fault type of the bus and converting the fault type into a second signal and sending the second signal to the protecting module 3;
the protection module 3 is used for receiving the second signal sent by the judging module 2, and cutting off the operation bus through charging to the dead zone logic differential protection.
Referring to fig. 2, the embodiment specifically discloses a detection module 1, which includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an amplifier A1, an amplifier A2, and a detection circuit P1, which are sequentially connected.
The resistor R2 is connected with the resistor R1 and the negative input end of the amplifier A1, and the positive input end of the amplifier A1 is connected with the output end of the amplifier A1; the negative input end of the amplifier A2 is connected with the output end of the amplifier A1, and the output end of the amplifier A2 is connected with the resistor R3; the resistor R3 is connected with the resistor R5 and the resistor R4, the first port of the detection circuit P1 is connected with the resistor R4 and the power supply VCC, the third port is connected with the resistor R5, and the fourth port is grounded GND.
The detection module 1 provided by the embodiment is used for receiving the fault current of the bus and converting the fault current into the first signal to be sent to the judging module 2, and has the advantages of simple structure, high safety, low energy consumption and convenient operation during maintenance.
Referring to fig. 3, the embodiment specifically discloses a judging module 2, which includes a judging loop P2.
The S port of the judging circuit P2 is connected with a power supply VCC, the R port is grounded GND, and the CK port is connected with the second port of the detecting circuit P1.
Referring to fig. 4, the embodiment specifically discloses the fault type judged by the judging module 2, including an operation bus, an overhaul bus, a fault current and a closed bus-bar circuit breaker.
The fault of the judging module 2, which is charged to the dead zone, only occurs on the charging side, which is needed by the current transformer and is close to the bus to be overhauled, and on the charging bus side, which is close to the bus sectionalizing breaker, so that the fault type of the bus differential protection device can be accurately judged, any breaker is overhauled, and the non-fault part of the bus can continue to work and the operation scheduling is flexible.
Referring to fig. 5, the present embodiment specifically discloses a protection module 3, which includes a protection loop P3.
The port A, the port B and the port C of the protection circuit P3 are connected with a power supply VCC, the port D is connected with the port Q of the judgment circuit P2, the port INH/E\X\P\is connected with the port Q\of the judgment circuit P2, and the port E, the port F, the port G and the port H are grounded to GND.
Referring to fig. 6, the present embodiment specifically discloses a logic function diagram of the protection module 3, which includes a not gate 101, an or gate 102, a first and gate, a second and gate, a third and gate, and a fourth and gate that are sequentially connected.
The input end of the NOT gate 101 is connected with a jump joint of a bus-tie breaker; the input end of the OR gate 102 is connected with the output end of the NOT gate 101 and the jump bit of the bus-tie circuit breaker; the input end of the first AND gate is connected with a bus, a bus-bar circuit breaker current, a differential protection device and the output end of the OR gate 102, and a charging hand-in contact of the bus-bar circuit breaker; the input end of the second AND gate is connected with the output end of the first AND gate and the current of the bus-bar circuit breaker; the input end of the third AND gate is connected with the large-difference compound ratio differential motion and the output end of the second AND gate, and the output end of the third AND gate is connected with a bus-bar breaker; the input end of the fourth AND gate is connected with the output end of the second AND gate and the charging hand-in contact of the bus-bar breaker, and the output end of the fourth AND gate is connected with the locking differential outlet.
The detection module 1 inputs the fault current of the bus, converts the fault current into a first signal through the amplifier A1, the amplifier A2 and the detection circuit P1, and sends the first signal to the judgment module 2; the judging module 2 receives the first signal, confirms the fault type through the judging loop P2, and the judging loop P2 converts the fault type into a second signal and sends the second signal to the protecting module 3; the protection module 3 receives the second signal sent by the judging module 2, starts the protection loop P3, and cuts off the bus-tie switch through charging to the dead zone logic differential protection.
When a fault occurs in the protection module 3 provided by the embodiment, no current flows through the current transformer, the differential protection cannot be locked and the busbar breaker switch cannot be cut off by starting the charging protection, the busbar breaker switch is cut off by charging to the dead zone logic differential protection, the logic charged to the dead zone is not existed when the busbar on the other side is charged close to the current transformer busbar, and the dead zone protection of the busbar breaker can cut off the fault, so that for the manual relay contact leading people of the busbar differential protection, only the protection of the current transformer on the side far away from the busbar is considered, and for the busbar differential protection of the double-busbar double-section system sectional breaker operation box, only 2 manual relay contacts are provided, and 4 manual relay contacts can be provided for the busbar differential protection without expanding the contacts.
The protection hand that the protection module 3 that this embodiment provided closes with the dead zone trouble closes, and the female current flow direction trouble spot of hand closes the relay, and the female circuit breaker does not have the flow, can not cut off the trouble through the overcurrent protection that charges, just by female the connection charge in dead zone protection trip female circuit breaker to ensure that other outgoing lines of generating line can not jump because of differential action, realized the effective protection to the charging process, solved the problem that charges to the dead zone trouble, convenient operation when overhauling, avoid the emergence of hidden danger, reduce the expansion of accident, guarantee the safe and stable operation of electric wire netting.
Secondly: in the drawings of the disclosed embodiments, only the structures related to the embodiments of the present disclosure are referred to, and other structures can refer to the common design, so that the same embodiment and different embodiments of the present disclosure can be combined with each other under the condition of no conflict;
Finally: the foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (4)
1. The utility model provides a protection circuit that charges of hand relay, includes, its characterized in that: comprises a detection module (1), a judgment module (2) and a protection module (3);
The detection module (1) is used for receiving the fault current of the bus and converting the fault current into a first signal to be sent to the judgment module (2);
The detection module (1) comprises a resistor unit, an amplifier unit and a detection circuit P1 which are sequentially connected;
The resistance unit of the detection module (1) comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5;
the amplifier unit of the detection module (1) comprises an amplifier A1 and an amplifier A2;
the resistor R2 is connected with the resistor R1 and the negative input end of the amplifier A1, the positive input end of the amplifier A1 is connected with the output end of the amplifier A1, the negative input end of the amplifier A2 is connected with the output end of the amplifier A1, the output end of the amplifier A2 is connected with the resistor R3, the resistor R3 is connected with the resistor R5 and the resistor R4, the first port of the detection circuit P1 is connected with the resistor R4 and the power supply VCC, the third port is connected with the resistor R5, and the fourth port is grounded GND;
the judging module (2) is used for judging the fault type of the bus and converting the fault type into a second signal to be sent to the protection module (3);
the judging module (2) comprises a judging loop P2;
The protection module (3) is used for receiving the second signal sent by the judging module (2) and cutting off the operation bus through charging to the dead zone logic differential protection;
The protection module (3) comprises a protection loop P3;
The logic function diagram of the protection module (3) comprises an NOT gate (101), an OR gate (102), a first AND gate, a second AND gate, a third AND gate and a fourth AND gate which are sequentially connected.
2. The charging protection circuit of a manual relay according to claim 1, wherein: the S port of the judging circuit P2 is connected with a power supply VCC, the R port is grounded GND, and the CK port is connected with the second port of the detecting circuit P1.
3. The charging protection circuit of a manual relay according to claim 1, wherein: the fault type of the judging module (2) comprises an operation bus, an overhaul bus, fault current and a closed bus-bar circuit breaker.
4. The charging protection circuit of a manual relay according to claim 1, wherein: the port A, the port B and the port C of the protection loop P3 are connected with a power supply VCC, the port D is connected with the port Q of the judgment loop P2, the port INH/E\X\P\is connected with the port Q\of the judgment loop P2, and the port E, the port F, the port G and the port H are grounded to GND;
The input end of the NOT gate (101) is connected with the jump joint of the bus-bar circuit breaker, the input end of the OR gate (102) is connected with the output end of the NOT gate (101) and the jump joint of the bus-bar circuit breaker, the input end of the first AND gate is connected with a bus, the current of the bus-bar circuit breaker, the differential protection device, the output end of the OR gate (102) and the charging hand-on contact of the bus-bar circuit breaker;
The input end of the second AND gate is connected with the output end of the first AND gate and the current of the bus-bar breaker, the input end of the third AND gate is connected with the output end of the second AND gate and the output end of the large-difference compound ratio differential motion, the output end of the third AND gate is connected with the bus-bar breaker, the input end of the fourth AND gate is connected with the output end of the second AND gate and the charging hand-on joint of the bus-bar breaker, and the output end of the fourth AND gate is connected with the locking differential outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322537558.0U CN220964323U (en) | 2023-09-18 | 2023-09-18 | Charging protection circuit of manual relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322537558.0U CN220964323U (en) | 2023-09-18 | 2023-09-18 | Charging protection circuit of manual relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220964323U true CN220964323U (en) | 2024-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322537558.0U Active CN220964323U (en) | 2023-09-18 | 2023-09-18 | Charging protection circuit of manual relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220964323U (en) |
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2023
- 2023-09-18 CN CN202322537558.0U patent/CN220964323U/en active Active
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