CN113644634A - Interphase short circuit processing device - Google Patents
Interphase short circuit processing device Download PDFInfo
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- CN113644634A CN113644634A CN202110063381.8A CN202110063381A CN113644634A CN 113644634 A CN113644634 A CN 113644634A CN 202110063381 A CN202110063381 A CN 202110063381A CN 113644634 A CN113644634 A CN 113644634A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Abstract
The invention discloses an interphase short-circuit processing device which comprises a three-phase circuit breaker, a first switch group and a second switch group, wherein the first switch group and the second switch group respectively comprise two single-phase switches, and one of the two single-phase switches of the second switch group is positioned in a different phase from the first switch group; the device also comprises an interphase short circuit identification module and a control module. 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 invention relates to the field of power supply system fault processing, in particular to an interphase 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.
Disclosure of Invention
The invention aims to provide a device for interphase short circuit, which can conveniently realize the conduction of a fault phase and the grounding of another fault phase when an interphase short circuit fault occurs, thereby creating conditions for the rapid processing of the interphase short circuit fault.
In order to achieve the purpose, the invention adopts the following technical scheme:
an interphase short-circuit processing device 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 controls the three-phase circuit breaker, the first switch group and the second switch group to act according to the following logic according to the identification result of the interphase short circuit identification module:
when a simple two-phase or three-phase interphase short circuit occurs, the following logic (a) is adopted:
(a) firstly, tripping the three-phase circuit breaker, conducting a fault phase through a first switch group after the tripping is successful, and grounding another fault phase through a second switch group;
when a two-phase or three-phase interphase short circuit occurs and an earth fault occurs at a short-circuit point, processing according to the logic (a) or processing according to the following logic (b):
(b) the three-phase circuit breaker is tripped firstly, a fault phase is conducted through the first switch group after tripping is successful, and the second switch group is kept disconnected.
Preferably, the control module controls the three-phase circuit breaker, the first switch group and the second switch group to operate according to the following logic:
(a1) the first switch group is positioned on the AB two phases, and when the second switch group is connected with the BC two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the A phase, and the second switch group conducts the B phase to the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
(a2) the first switch group is positioned on the AB two phases, and the second switch group is connected with the AC two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group conducts the A phase with the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
(b1) the first switch group is positioned on the BC two phases, and the second switch group is connected with the AC two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group conducts the A phase with the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
(b2) the first switch group is positioned on the two phases BC, and when the second switch group is connected with the two phases AB and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group conducts the A phase with the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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; 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;
(c1) when the first switch group is positioned on the AC two phases and the second switch group is connected with the AB two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the A phase, and the second switch group conducts the B phase to the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
(c2) the first switch group is positioned on the AC two phases, and the second switch group is connected with the BC two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the A phase, and the second switch group conducts the B phase to the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
or the control module respectively controls the first switch group and the second switch group to act according to the identification result of the interphase short circuit identification module and the following conditions:
(a) the first switch group is positioned on the AB two phases, and the second switch group is connected with the BC two phases and the ground or the AC two phases and the ground:
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;
(b) the first switch group is positioned on the BC two phases, and the second switch group is connected with the AC two phases and the ground or the AB two phases and the ground:
when the two phases of the AB phase are short-circuited, the three-phase circuit breaker trips, the first switch group conducts the phase B, and the second switch group keeps the two phases of the AC phase disconnected with the ground or keeps the two phases of the AB phase disconnected with the ground;
when the AC two phases are short-circuited, the three-phase circuit breaker trips, the first switch group conducts 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;
when the BC two-phase is in short circuit, 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 short-circuited, 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;
(c) the first switch group is positioned on the AC two phases, and the second switch group is connected with the AB two phases and the ground or the BC two phases and the ground:
when the two phases of the AB phase are in short circuit, 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 is in short circuit, 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 short-circuited, 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 short circuit occurs, 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.
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 invention has the beneficial effects 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 two phases AB, and the second switch set is connected between the two phases BC and the ground).
Detailed Description
The invention will be further illustrated by the following specific embodiments in conjunction with the accompanying drawings:
as shown in figure 1, the power supply system is provided with a power supply and a bus, wherein a plurality of ABC three-phase outgoing lines are branched from the bus. The interphase short circuit processing device 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 has the following action logics in the prior art:
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 two-phase or three-phase interphase short circuit occurs and a ground fault occurs at a short circuit point, the following treatment can be performed besides the simple interphase short circuit treatment: the three-phase circuit breaker 3 is first tripped and then a faulty phase is switched on by the first switch group 1, while the second switch group 2 remains open.
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 AB two-phase interphase short circuit (including a pure interphase short circuit or an attached ground fault at the same time, the same below) occurs, the three-phase circuit breaker trips, the first switch group conducts the A phase, and the second switch group conducts the B phase 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 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, the 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 values during phase-to-phase faults.
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, 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 the inter-phase fault during subsequent processing (for eliminating the inter-phase short-circuit fault by using the controlled switch, see patent application 202011492758.3 and patent application 202011453632.5).
The above embodiments are only a few illustrations of the inventive concept and implementation, not limitations thereof, and the technical solutions without substantial changes are still within the scope of protection under the inventive concept.
Claims (5)
1. An interphase short-circuit processing device 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 controls the three-phase circuit breaker, the first switch group and the second switch group to act according to the following logic according to the identification result of the interphase short circuit identification module:
when a simple two-phase or three-phase interphase short circuit occurs, the following logic (a) is adopted:
(a) firstly, tripping the three-phase circuit breaker, conducting a fault phase through a first switch group after the tripping is successful, and grounding another fault phase through a second switch group;
when a two-phase or three-phase interphase short circuit occurs and an earth fault occurs at a short-circuit point, processing according to the logic (a) or processing according to the following logic (b):
(b) the three-phase circuit breaker is tripped firstly, a fault phase is conducted through the first switch group after tripping is successful, and the second switch group is kept disconnected.
2. The interphase short-circuit processing device according to claim 1, characterized in that the control module controls the three-phase circuit breaker, the first switch group and the second switch group to operate according to the following logic:
(a1) the first switch group is positioned on the AB two phases, and when the second switch group is connected with the BC two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the A phase, and the second switch group conducts the B phase to the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
(a2) the first switch group is positioned on the AB two phases, and the second switch group is connected with the AC two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group conducts the A phase with the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
(b1) the first switch group is positioned on the BC two phases, and the second switch group is connected with the AC two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group conducts the A phase with the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
(b2) the first switch group is positioned on the two phases BC, and when the second switch group is connected with the two phases AB and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the B phase, and the second switch group conducts the A phase with the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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; 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;
(c1) when the first switch group is positioned on the AC two phases and the second switch group is connected with the AB two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the A phase, and the second switch group conducts the B phase to the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
(c2) the first switch group is positioned on the AC two phases, and the second switch group is connected with the BC two phases and the ground:
when the AB two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, the three-phase circuit breaker trips, the first switch group conducts the A phase, and the second switch group conducts the B phase to the ground;
when the AC two phases are simply in interphase short circuit or are accompanied by a ground fault at the same time, 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 simply in interphase short circuit or is accompanied by a ground fault, 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 phases are simply in phase-to-phase short circuit or are accompanied by a ground fault, 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;
or the control module respectively controls the first switch group and the second switch group to act according to the identification result of the interphase short circuit identification module and the following conditions:
(a) the first switch group is positioned on the AB two phases, and the second switch group is connected with the BC two phases and the ground or the AC two phases and the ground:
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;
(b) the first switch group is positioned on the BC two phases, and the second switch group is connected with the AC two phases and the ground or the AB two phases and the ground:
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;
(c) the first switch group is positioned on the AC two phases, and the second switch group is connected with the AB two phases and the ground or the BC two phases and the ground:
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.
3. The interphase short-circuit processing device according to claim 1, characterized in that an adjustable resistor is connected in series between the second switch group and the ground.
4. The interphase short-circuit processing device according to claim 1, characterized in that an adjustable resistor is connected in series between the first switch group and the bus.
5. The interphase short-circuit processing device according to claim 1, wherein the single-phase switch of the first switch group is tripped when a preset value is reached by the number of current pulses or the current duration.
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