CN214707147U - Device for processing intermediate short circuit in power supply system - Google Patents
Device for processing intermediate short circuit in power supply system Download PDFInfo
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- CN214707147U CN214707147U CN202120127371.1U CN202120127371U CN214707147U CN 214707147 U CN214707147 U CN 214707147U CN 202120127371 U CN202120127371 U CN 202120127371U CN 214707147 U CN214707147 U CN 214707147U
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Abstract
The utility model discloses an interphase short circuit processing device in a power supply system, which comprises a three-phase circuit breaker, a first switch group, a second switch group, an interphase short circuit identification module and a control module, wherein the three-phase circuit breaker is a first circuit breaker arranged on an outgoing line and is used for connecting a bus and ABC three phases of the outgoing line; the first switch group and the second switch group respectively comprise two single-phase switches, and the two single-phase switches of the first switch group are respectively connected with any two phases of the bus and the ABC three-phase outgoing line; two single-phase switches of the second switch group are respectively connected with any two phases in the outgoing lines of the lower port of the three-phase circuit breaker and the ground, and the control module is respectively connected with the interphase short circuit identification module, the three-phase circuit breaker, the first switch group and the second switch group. The device can conveniently realize the conduction of one fault phase and the grounding of the other fault phase when an interphase short-circuit fault occurs, thereby creating conditions for the rapid processing of the interphase short-circuit fault.
Description
Technical Field
The utility model relates to a power supply system fault handling field, concretely relates to power supply system middle relative short-circuit processing device.
Background
At present, the problems of complex operation, untimely operation, inaccurate positioning and the like exist in the processing of interphase short circuit faults of a power supply system, and the power supply quality is influenced. The invention patent application 202011492758.3 and the invention patent application 202011453632.5 provide a method for handling an inter-phase short circuit in a power supply system, according to which, when an inter-phase short circuit occurs, a faulty phase is maintained to be conducted and the remaining faulty phases are tripped, then the other faulty phase is grounded, a live phase is grounded to form a closed loop with the two faulty phases connected through the short circuit and generate a current or a current pulse, and then the current duration or the current pulse number is detected by a controlled switch and tripped to remove the fault. In practice, there are many implementations for maintaining a failed phase conductive and tripping the remaining failed phases, and achieving the above objective quickly by the device is a technical problem that the art is expected to solve.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a device of looks short circuit, the device can conveniently realize switching on of a trouble looks and the ground connection of another trouble looks when taking place looks short circuit fault to create the condition for the rapid processing of looks short circuit fault.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an inter-phase short circuit processing device in a power supply system comprises a three-phase circuit breaker, a first switch group and a second switch group,
the three-phase circuit breaker is a first circuit breaker arranged on the outgoing line and is used for connecting the bus with the ABC three phases of the outgoing line;
the first switch group comprises two single-phase switches, and the two single-phase switches of the first switch group are respectively connected with any two phases of the bus and the ABC three-phase outgoing line and can short-circuit any one of the two phases at the three-phase circuit breaker;
the second switch group comprises two single-phase switches, the two single-phase switches of the second switch group are respectively connected with any two phases in the outgoing lines of the lower port of the three-phase circuit breaker and the ground, and one of the two single-phase switches of the second switch group is positioned in a different phase from the first switch group;
further comprising:
the interphase short circuit identification module is used for identifying whether interphase short circuit, fault phase, interphase short circuit are removed or not and whether incidental ground fault occurs or not;
and the control module is respectively connected with the interphase short circuit identification module and the three-phase circuit breaker, the first switch group and the second switch group, and can control the three-phase circuit breaker, the first switch group and the second switch group to act according to the identification result of the interphase short circuit identification module.
Preferably, an adjustable resistor is connected in series between the second switch group and the ground.
Preferably, an adjustable resistor is connected in series between the first switch group and the bus.
Preferably, the single-phase switch of the first switch group trips when the number of current pulses or the current duration reaches a preset value.
The utility model has the advantages that: through setting up two single-phase switches of three-phase circuit breaker, first switch block and two single-phase switches of second switch block and alternate short circuit identification module and control module, can automatic selection switch on a trouble looks and switch on to can make another trouble looks ground connection automatically, thereby create the condition for later stage injection current pulse and discernment trouble. The control module gives optimized control logic on the basis of the identification of the interphase short-circuit identification module, so that optimal control is realized, and the speed and quality of interphase short-circuit fault processing are improved powerfully.
Drawings
Fig. 1 is a schematic diagram of the structure and connection of the present invention (the first switch set is located on the phase AB, and the second switch set is connected between the phase BC and the ground).
Detailed Description
The invention will be further explained by means of specific embodiments with reference to the accompanying drawings:
as shown in figure 1, the power supply system is provided with a power supply and a bus, and a plurality of ABC three-phase outgoing lines are branched from the bus. The interphase short circuit processing device in the power supply system comprises a first switch group 1, a second switch group 2 and a three-phase circuit breaker 3, wherein the three-phase circuit breaker 3 is arranged on each outgoing line and is a first circuit breaker on the outgoing line and used for connecting a bus and ABC three phases of the outgoing line. The first switch group 1 comprises two single-phase switches, the two single-phase switches of the first switch group are respectively connected with any two phases of the bus and the ABC three-phase outgoing line, and two phases of the three-phase circuit breaker 3 can be in short circuit. The second switch group 2 includes two single-phase switches, the two single-phase switches of the second switch group 2 are respectively connected to any two phases of the outgoing lines at the lower port of the three-phase circuit breaker 3 and the ground, and one of the two single-phase switches of the second switch group 3 and the first switch group are located at different phases, and if the first switch group is located at the AB two phases, the second switch group may be located at the BC two phases or the AC two phases. Still include alternate short circuit identification module 4 for whether take place alternate short circuit and trouble phase and discern whether the alternate short circuit amputates and whether take place subsidiary ground fault, adopt prior art's circuit or singlechip to realize. And the control module 6 is used for controlling the three-phase circuit breaker 3, the first switch group 1 and the second switch group 2 to act according to the identification result of the interphase short circuit identification module 4. The control module can be realized by adopting the existing circuit or a single chip microcomputer, and belongs to the prior art.
When the device is in use, when a simple two-phase or three-phase interphase short circuit occurs, the three-phase circuit breaker 3 is tripped firstly, then one fault phase is conducted through the first switch group 1, and the other fault phase is grounded through the second switch group 2; or when a two-phase or three-phase interphase short circuit occurs and an earth fault occurs at a short-circuit point, the three-phase circuit breaker 3 is tripped firstly, then a fault phase is conducted through the first switch group 1, and the second switch group 2 is kept disconnected.
In one embodiment, the first switch set is located on the two phases AB, and the second switch set is connected between the two phases BC and ground, where:
when the two phases of the AB are in short circuit, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase B to the ground;
when the AC two-phase is in short circuit, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase C to the ground;
when the BC two-phase is in short circuit, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group conducts the C phase with the ground;
when the ABC three-phase is short-circuited, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase B or the phase C to the ground; or the first switch group conducts the phase B, and the second switch group conducts the phase C to the ground;
in one embodiment, the first switch set is located on the AB two phases, and the second switch set is connected between the AC two phases and ground, when:
when the two phases of the AB are in short circuit, the three-phase circuit breaker trips, the first switch group conducts the phase B, and the second switch group conducts the phase A with the ground;
when the AC two-phase is in short circuit, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase C to the ground;
when the BC two-phase is in short circuit, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group conducts the C phase with the ground;
when the ABC three-phase is short-circuited, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase C to the ground; or the first switch group conducts the phase B, and the second switch group conducts the phase A or the phase C to the ground;
in one embodiment, the first switch set is located on the BC two phases, and the second switch set connects the AC two phases and ground, when:
when the two phases of the AB are in short circuit, the three-phase circuit breaker trips, the first switch group conducts the phase B, and the second switch group conducts the phase A with the ground;
when the AC two-phase is short-circuited, the three-phase circuit breaker trips, the first switch group conducts the C phase, and the second switch group conducts the A phase with the ground;
when the BC two-phase is in short circuit, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group conducts the C phase with the ground;
when the ABC three-phase-to-phase short circuit occurs, the three-phase circuit breaker trips, the first switch group conducts the phase B, and the second switch group conducts the phase C or the phase A to the ground; or the first switch group conducts the phase C, and the second switch group conducts the phase A to the ground;
in one embodiment, the first switch set is located on the two phases BC, and the second switch set is connected between the two phases AB and ground, where:
when the two phases of the AB are in short circuit, the three-phase circuit breaker trips, the first switch group conducts the phase B, and the second switch group conducts the phase A with the ground;
when the AC two-phase is short-circuited, the three-phase circuit breaker trips, the first switch group conducts the C phase, and the second switch group conducts the A phase with the ground;
when the BC two-phase is in short circuit, the three-phase circuit breaker trips, the first switch group conducts the C phase, and the second switch group conducts the B phase with the ground;
when the ABC three-phase is short-circuited, the three-phase circuit breaker trips, the first switch group conducts the phase B, and the second switch group conducts the phase A to the ground; or the first switch group conducts the phase C, and the second switch group conducts the phase A or the phase B to the ground;
in one embodiment, the first switch set is located on the AC two phases, and the second switch set is connected between the AB two phases and the ground, when:
when the two phases of the AB are in short circuit, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase B to the ground;
when the AC two-phase is short-circuited, the three-phase circuit breaker trips, the first switch group conducts the C phase, and the second switch group conducts the A phase with the ground;
when the BC two-phase is in short circuit, the three-phase circuit breaker trips, the first switch group conducts the C phase, and the second switch group conducts the B phase with the ground;
when the ABC three-phase is short-circuited, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase B to the ground; or the first switch group conducts the phase C, and the second switch group conducts the phase A or the phase B to the ground;
in one embodiment, the first switch set is located on the AC two phases, and the second switch set connects the BC two phases and ground, when:
when the two phases of the AB are in short circuit, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase B to the ground;
when the AC two-phase is in short circuit, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase C to the ground;
when the BC two-phase is in short circuit, the three-phase circuit breaker trips, the first switch group conducts the C phase, and the second switch group conducts the B phase with the ground;
when the ABC three-phase is short-circuited, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group conducts the phase B or the phase C to the ground; or the first switch group conducts the phase C, and the second switch group conducts the phase B to the ground.
In one embodiment, the first switch set is located on the AB two phases, and the second switch set connects the BC two phases and the ground or the AC two phases and the ground, when:
when the two phases of the AB phase are in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the phase A or the phase B, and the second switch group keeps the phase BC and the ground disconnected or keeps the phase AC and the ground disconnected;
when the AC two-phase phases are in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the A phase, and the second switch group keeps the BC two phase and the ground disconnected or keeps the AC two phase and the ground disconnected;
when the two phases of BC are in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the phase B, and the second switch group keeps the two phases of BC disconnected with the ground or the two phases of AC disconnected with the ground;
when the ABC three-phase is in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the A phase, and the second switch group keeps the BC two phase and the ground disconnected or keeps the AC two phase and the ground disconnected; or the first switch group switches on the B phase, and the second switch group keeps the BC two phases and the ground disconnected or keeps the AC two phases and the ground disconnected.
In one embodiment, the first switch set is located on the BC two phases, and the second switch set connects the AC two phases and the ground or the AB two phases and the ground, when:
when the phase of the AB two phases is short-circuited and a ground fault occurs at a short-circuit point, the three-phase circuit breaker trips, the first switch group conducts the phase B, and the second switch group keeps the AC two phases disconnected with the ground or the AB two phases disconnected with the ground;
when the AC two-phase phases are in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the C phase, and the second switch group keeps the AC two phase and the ground disconnected or keeps the AB two phase and the ground disconnected;
when the BC two-phase is in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the B phase or the C phase, and the second switch group keeps the AC two phase and the ground disconnected or keeps the AB two phase and the ground disconnected;
when the ABC three-phase is in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group keeps the AC two phase and the ground disconnected or keeps the AB two phase and the ground disconnected; or the first switch group switches on the C phase, and the second switch group keeps the AC two phases and the ground disconnected or keeps the AB two phases and the ground disconnected.
In one embodiment, the first switch set is located on the AC two phases, and the second switch set connects the AB two phases and the ground or the BC two phases and the ground, when:
when the two phases of the AB phase are in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group keeps the two phases of the AB phase disconnected with the ground or the two phases of the BC phase disconnected with the ground;
when the AC two-phase phases are in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the A phase or the C phase, and the second switch group keeps the AB two phase and the ground disconnected or keeps the BC two phase and the ground disconnected;
when the two phases of BC are in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the phase C, and the second switch group keeps the two phases of AB and the ground disconnected or the two phases of BC and the ground disconnected;
when the ABC three-phase interphase is in short circuit and a ground fault occurs at a short circuit point, the three-phase circuit breaker trips, the first switch group conducts the phase A, and the second switch group keeps the phase AB and the ground disconnected or keeps the phase BC and the ground disconnected; or the first switch group switches on the C phase, and the second switch group keeps the AB two phases and the ground disconnected or keeps the BC two phases and the ground disconnected.
In the above-described embodiment with a ground fault, after the first switch group is turned on to the faulty phase, the second switch group may be grounded by a ground point generated by the fault without operating.
In the above embodiment, in order to perform current limiting during the subsequent injection of current pulse or current duration, an adjustable resistor 7 may be connected in series between the second switch group 2 and the ground for current limiting, or an adjustable resistor (not shown in the figure) may be connected in series between the first switch group 1 and the bus. The adjustable resistor 7 can be realized by adopting a resistor box, a required resistor is connected into a circuit in series according to the calculated resistance value, and the resistance value of the resistor can be obtained by calculating the voltage and current numerical values when a time fault occurs.
In the above embodiment, the two single-phase switches in the first switch group 1 are further used in cooperation with the current detection module 5, and when the current detection module 5 detects that the current pulse number or the current duration of a certain phase exceeds a preset value, the control module 6 causes the single-phase switch to trip the circuit, so that the single-phase switch can also be used as a controlled switch for automatically eliminating phase-to-phase faults during subsequent processing.
The above embodiments are only a few descriptions of the concept and implementation of the present invention, and are not intended to limit the scope of the present invention.
Claims (4)
1. An inter-phase short circuit processing device in a power supply system comprises a three-phase circuit breaker, a first switch group and a second switch group, and is characterized in that,
the three-phase circuit breaker is a first circuit breaker arranged on the outgoing line and is used for connecting the bus with the ABC three phases of the outgoing line;
the first switch group comprises two single-phase switches, and the two single-phase switches of the first switch group are respectively connected with any two phases of the bus and the ABC three-phase outgoing line and can short-circuit any one of the two phases at the three-phase circuit breaker;
the second switch group comprises two single-phase switches, the two single-phase switches of the second switch group are respectively connected with any two phases in the outgoing lines of the lower port of the three-phase circuit breaker and the ground, and one of the two single-phase switches of the second switch group is positioned in a different phase from the first switch group;
further comprising:
the interphase short circuit identification module is used for identifying whether interphase short circuit, fault phase, interphase short circuit are removed or not and whether incidental ground fault occurs or not;
and the control module is respectively connected with the interphase short circuit identification module and the three-phase circuit breaker, the first switch group and the second switch group, and can control the three-phase circuit breaker, the first switch group and the second switch group to act according to the identification result of the interphase short circuit identification module.
2. The apparatus for processing the inter-phase short circuit in the power supply system according to claim 1, wherein an adjustable resistor is connected in series between the second switch group and the ground.
3. The apparatus for processing the inter-phase short circuit in the power supply system according to claim 1, wherein an adjustable resistor is connected in series between the first switch group and the bus.
4. The apparatus for processing the interphase short-circuit in the power supply system according to claim 1, wherein the single-phase switch of the first switch group is tripped when a predetermined value is reached by a pulse number or a current duration of the single-phase switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120127371.1U CN214707147U (en) | 2021-01-18 | 2021-01-18 | Device for processing intermediate short circuit in power supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120127371.1U CN214707147U (en) | 2021-01-18 | 2021-01-18 | Device for processing intermediate short circuit in power supply system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114814465A (en) * | 2022-05-17 | 2022-07-29 | 云南电网有限责任公司临沧供电局 | Distribution line fault finding system and method |
| CN114814464A (en) * | 2022-05-17 | 2022-07-29 | 云南电网有限责任公司临沧供电局 | Three-phase circuit fault finding system and method |
| CN114859177A (en) * | 2022-05-17 | 2022-08-05 | 云南电网有限责任公司临沧供电局 | A kind of fault finding system and method based on split-phase switch |
-
2021
- 2021-01-18 CN CN202120127371.1U patent/CN214707147U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114814465A (en) * | 2022-05-17 | 2022-07-29 | 云南电网有限责任公司临沧供电局 | Distribution line fault finding system and method |
| CN114814464A (en) * | 2022-05-17 | 2022-07-29 | 云南电网有限责任公司临沧供电局 | Three-phase circuit fault finding system and method |
| CN114859177A (en) * | 2022-05-17 | 2022-08-05 | 云南电网有限责任公司临沧供电局 | A kind of fault finding system and method based on split-phase switch |
| CN114814465B (en) * | 2022-05-17 | 2024-02-13 | 云南电网有限责任公司临沧供电局 | Distribution line fault finding system and method |
| CN114814464B (en) * | 2022-05-17 | 2024-06-14 | 云南电网有限责任公司临沧供电局 | Three-phase circuit fault finding system and method |
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