CN113644622B - Device for assisting in processing interphase short circuit - Google Patents
Device for assisting in processing interphase short circuit Download PDFInfo
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- CN113644622B CN113644622B CN202110063838.5A CN202110063838A CN113644622B CN 113644622 B CN113644622 B CN 113644622B CN 202110063838 A CN202110063838 A CN 202110063838A CN 113644622 B CN113644622 B CN 113644622B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a device for assisting in processing interphase short circuit, which comprises a first switch group and a second switch group, wherein the first switch group comprises three single-phase switches which are respectively connected with a bus and an ABC three-phase outgoing line; the second switch group comprises two single-phase switches which are respectively connected with any two phases in the outlet wire of the lower opening of the first switch group and the ground; 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 the 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 a device for assisting in processing interphase short circuit.
Background
At present, problems of complicated operation, untimely positioning, inaccuracy and the like exist in the treatment of interphase short circuit faults of a power supply system, and the power supply quality is affected. The invention patent application 202011492758.3 and the invention patent application 202011453632.5 provide a method for handling an interphase short circuit of a power supply system, according to which, when an interphase short circuit occurs, a fault phase is maintained to be conducted and the rest of the fault phases are tripped, then another fault phase is grounded, and then a live phase is grounded so as to form a closed loop with the two fault phases connected through the short circuit and generate a current or a current pulse, and then the duration of the current or the number of current pulses is detected through a controlled switch and tripped so as to cut off the fault. In practical operation, there are various implementations for maintaining one fault phase on and tripping the other fault phases, and the quick implementation of the above objective by the device is a technical problem that the art desires to solve.
Disclosure of Invention
The invention aims to provide a device for assisting in processing interphase short circuit, which can conveniently realize the conduction of one fault phase and the grounding of the other fault phase when the interphase short circuit fault occurs, thereby creating conditions for the rapid processing of the interphase short circuit fault.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an auxiliary device for processing interphase short circuit comprises a first switch group and a second switch group, wherein the first switch group comprises three single-phase switches which are respectively connected with a bus and an ABC three-phase outgoing line;
the second switch group comprises two single-phase switches which are respectively connected with any two phases in the outlet wire of the lower opening of the first switch group and the ground;
further comprises:
the interphase short circuit identification module is used for identifying whether interphase short circuit occurs, a fault phase occurs, whether interphase short circuit is cut off or not, and whether an attached ground fault occurs or not;
the control module is used for respectively controlling the first switch group and the second switch group according to the identification result of the interphase short circuit identification module, and the first switch group and the second switch group act according to the following logic:
when a simple two-phase or three-phase interphase short circuit occurs, the processing is performed according to the following logic (a):
(a) Maintaining the conduction of one fault phase through the first switch group and cutting off the other two phases, and connecting the other fault phase through the second switch group;
when a two-phase or three-phase-to-phase short circuit occurs and a ground fault occurs at the short circuit point, the processing is performed according to the logic (a) or the processing is performed according to the following logic (b):
the first switch group maintains a fault phase to be conducted and cuts off the other two phases, and the second switch group is kept to be disconnected.
Preferably, the control module controls the first switch group and the second switch group to act according to the following logic respectively:
(a) When the second switch group is connected with BC two phases and the ground:
when the AB two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps the A phase conducting and cuts off the BC two phases, and the second switch group conducts the B phase to the earth;
when the AC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps the A phase conducting and cuts off the BC two phases, and the second switch group conducts the C phase to the earth;
when BC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps B phases conductive and cuts off AC two phases, and the second switch group conducts C phases to the earth; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the B phase to the ground;
when ABC three-phase simple interphase short circuit or simultaneously attached ground fault, the first switch group keeps the A phase conducting and cuts off the BC two phases, and the second switch group conducts the B phase or the C phase to the ground; or the first switch group keeps B phase conductive and cuts off AC two phases, and the second switch group conducts C phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the B phase to the ground;
(b) When the second switch group is connected with AC two phases and the ground:
when the AB two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps B phases conducting and cuts off AC two phases, and the second switch group conducts A phases to the earth;
when the AC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps the A phase conducting and cuts off the BC two phases, and the second switch group conducts the C phase to the earth; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the A phase to the ground;
when BC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps B phases conductive and cuts off AC two phases, and the second switch group conducts C phases to the earth;
when ABC three-phase simple interphase short circuit or simultaneously has an earth fault, the first switch group keeps the A phase conductive and cuts off the BC two phases, and the second switch group conducts the C phase to the earth; or the first switch group keeps B phase conductive and cuts off AC two phases, and the second switch group conducts C phase or A phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the A phase to the ground;
(c) When 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 simultaneously have an earth fault, the first switch group keeps B phases conducting and cuts off AC two phases, and the second switch group conducts A phases to the earth; or the first switch group keeps the A phase conductive and cuts off the BC phase, and the second switch group conducts the B phase to the ground;
when the AC phase is simply and alternately short-circuited or simultaneously has a ground fault, the first switch group keeps the C phase conductive and cuts off the AB phase, and the second switch group conducts the A phase to the ground;
when BC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps C phase conduction and cuts off AB two phases, and the second switch group conducts B phase to the earth;
when ABC three-phase simple interphase short circuit or simultaneously has an earth fault, the first switch group keeps the A phase conductive and cuts off the BC two phases, and the second switch group conducts the B phase to the earth; or the first switch group keeps the B phase conductive and cuts off the AC two phases, and the second switch group conducts the A phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the A phase or the B phase to the ground;
or the control module respectively controls the first switch group and the second switch group to act according to the following logic:
(a) When the second switch group is connected with BC two phases and the ground:
when the AB two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the B phase and the C phase to be disconnected from the ground; or the first switch group keeps B phase on and cuts off AC two phases, and the second switch group keeps B phase and C phase disconnected from the ground;
when AC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the B phase and the C phase to be disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the B phase and the C phase disconnected from the ground;
when BC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps B phases on and cuts off AC two phases, and the second switch group keeps B phases and C phases disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the B phase and the C phase disconnected from the ground;
when ABC three-phase interphase is short-circuited and a ground fault occurs at a short-circuit point, the first switch group keeps the A phase on and cuts off the BC two phases, and the second switch group keeps the B phase and the C phase off from the ground; or the first switch group keeps B phase on and cuts off AC two phases, and the second switch group keeps B phase and C phase disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the B phase and the C phase disconnected from the ground;
(b) When the second switch group is connected with AC two phases and the ground:
when the AB two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground; or the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the C phase to be disconnected from the ground;
when AC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the C phase to be disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground;
when BC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps B phases on and cuts off AC two phases, and the second switch group keeps A phases and C phases disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground;
when ABC three-phase interphase is short-circuited and a ground fault occurs at a short-circuit point, the first switch group keeps the A phase on and cuts off the BC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground; or the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground;
(c) When the second switch group is connected with the AB two phases and the ground:
when the AB two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the B phase off from the ground; or the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the B phase to be disconnected from the ground;
when AC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the B phase to be disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground;
when BC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps B phases on and cuts off AC two phases, and the second switch group keeps A phases and B phases disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground;
when ABC three-phase interphase is short-circuited and a ground fault occurs at a short-circuit point, the first switch group keeps the A phase on and cuts off the BC two phases, and the second switch group keeps the A phase and the B phase off from the ground; or the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground.
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 passed reaches a preset value.
The invention has the beneficial effects that: by arranging three single-phase switches of the first switch group and two single-phase switches of the second switch group, and the interphase short-circuit identification module and the control module, one fault phase can be automatically selected to be conducted, the other two phases are cut off, and the other fault phase is automatically grounded, so that conditions are created for injecting current pulses and identifying faults in the later stage. The control module gives out 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 treatment are forcefully improved.
Drawings
FIG. 1 is a schematic diagram of the structure and connections of the present invention (the second switch set is connected between the BC two phases and ground).
Detailed Description
The invention is further illustrated by the following examples, taken in conjunction with the accompanying drawings:
as shown in FIG. 1, the power supply system is provided with a power supply and a bus, and a plurality of ABC three-phase outgoing lines are separated from the bus. The device for assisting in processing interphase short circuit comprises a first switch group 1 and a second switch group 2, wherein the first switch group 1 comprises three single-phase switches 101, the second switch group 2 comprises two single-phase switches 202, the three single-phase switches 101 are respectively connected with a bus and an ABC three-phase outgoing line, and the two single-phase switches 202 are respectively connected with any two phases and the ground in the lower outlet outgoing line of the first switch group 1, such as an AB two phase and the ground, an AC two phase and the ground, or a BC two phase and the ground. The device also comprises an interphase short circuit identification module 3 which is used for identifying whether interphase short circuit and fault phase occur, identifying whether interphase short circuit is cut off or not and whether an attached ground fault occurs, and is realized by adopting a circuit or a singlechip in the prior art; the control module 4 is capable of controlling the first switch group and the second switch group to act according to the identification result of the interphase short circuit identification module 3, and the control module can be realized by adopting an existing circuit or a singlechip, and is of the prior art. The control module 4 controls as follows:
when a simple two-phase or three-phase interphase short circuit occurs, one fault phase is maintained to be conducted through the first switch group, the other two phases are cut off, and the other fault phase is grounded through the second switch group;
or when a two-phase or three-phase interphase short circuit occurs and a ground fault occurs at a short circuit point, the following processing can be performed in addition to the simple interphase short circuit processing: the first switch group maintains a fault phase to be conducted and cuts off the other two phases, and the second switch group is kept to be disconnected.
Specifically, the following can be said:
the first case, when the second switch group connects BC two phases and ground respectively:
when the interphase short-circuit identification module 3 determines that the AB two-phase interphase is short-circuited (including simple interphase short-circuit or simultaneous attachment with ground fault, the same applies below), the control module 4 makes one single-phase switch in the first switch group 1 maintain the initial state of a-phase conduction, and issues an instruction to trip the other two single-phase switches so as to cut off the BC two phases, that is, only one fault phase is maintained to be conducted and the other two phases are cut off. At the same time, the control module 4 instructs one single-phase switch 202 of the second switch group 2 to be closed, and conducts the B phase to the ground, i.e. the phase to be conducted to the fault phase is grounded, so as to create conditions for injecting current pulses or current duration in the subsequent processing.
When the AC phase is short-circuited, the first switch group keeps the A phase conductive and cuts off the BC phase, and the second switch group conducts the C phase to the ground.
When BC two phases are in short circuit, the first switch group keeps B phases conductive and cuts off AC two phases, and the second switch group conducts C phases to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the B phase to the ground.
When ABC three phases are in short circuit, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group conducts the B phase or the C phase to the ground; or the first switch group keeps B phase conductive and cuts off AC two phases, and the second switch group conducts C phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the B phase to the ground.
In the second case, when the second switch group connects AC two phases and ground:
when the phases of the AB phases are short-circuited, the first switch group keeps the B phase conductive and cuts off the AC phases, and the second switch group conducts the A phase to the ground.
When the AC two phases are in short circuit, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group conducts the C phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the A phase to the ground.
When the BC two phases are short-circuited, the first switch group keeps the B phase conductive and cuts off the AC two phases, and the second switch group conducts the C phase to the ground.
When ABC three phases are in short circuit, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group conducts the C phase to the ground; or the first switch group keeps B phase conductive and cuts off AC two phases, and the second switch group conducts C phase or A phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the A phase to the ground.
In the third case, when the second switch group connects the AB two phases with the ground:
when the phases of the phases AB are short-circuited, the first switch group keeps the phases B to be conducted and cuts off the phases AC, and the second switch group conducts the phases A to the ground; or the first switch group keeps the A phase conductive and cuts off the BC phase, and the second switch group conducts the B phase to the ground.
When the AC phase is short-circuited, the first switch group keeps the C phase conductive and cuts off the AB phase, and the second switch group conducts the A phase to the ground.
When BC two phases are short-circuited, the first switch group keeps C phase conductive and cuts off AB two phases, and the second switch group conducts B phase to the ground.
When ABC three-phase interphase is short-circuited, the first switch group keeps the A phase conductive and cuts off the BC two phases, and the second switch group conducts the B phase to the ground; or the first switch group keeps the B phase conductive and cuts off the AC two phases, and the second switch group conducts the A phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the A phase or the B phase to the ground.
If the phase-to-phase short circuit is accompanied by a ground fault at the short-circuit point, the second switch group may be subjected to subsequent processing directly by using the fault ground point without performing the ground fault. That is, the control module 4 may control the first switch group and the second switch group to operate according to the recognition result of the interphase short-circuit recognition module 3 and according to the following cases, respectively:
in the first case, when the second switch group connects BC two phases and ground:
when the AB two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the B phase and the C phase to be disconnected from the ground; or the first switch group keeps the B phase on and cuts off the AC two phase, and the second switch group keeps the B phase and the C phase disconnected from the ground.
When AC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the B phase and the C phase to be disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the B phase and the C phase disconnected from the ground.
When BC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps B phases on and cuts off AC two phases, and the second switch group keeps B phases and C phases disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the B phase and the C phase disconnected from the ground.
When ABC three-phase interphase is short-circuited and a ground fault occurs at a short-circuit point, the first switch group keeps the A phase on and cuts off the BC two phases, and the second switch group keeps the B phase and the C phase off from the ground; or the first switch group keeps B phase on and cuts off AC two phases, and the second switch group keeps B phase and C phase disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the B phase and the C phase disconnected from the ground.
In the second case, when the second switch group connects AC two phases and ground:
when the AB two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground; or the first switch group keeps the A phase conductive and cuts off the BC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground.
When AC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the C phase to be disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground.
When BC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps B phases on and cuts off AC two phases, and the second switch group keeps A phases and C phases disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground.
When ABC three-phase interphase is short-circuited and a ground fault occurs at a short-circuit point, the first switch group keeps the A phase on and cuts off the BC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground; or the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground.
In the third case, when the second switch group connects the AB two phases with the ground:
when the AB two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the B phase off from the ground; or the first switch group keeps the A phase conductive and cuts off the BC two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground.
When AC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the B phase to be disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground.
When BC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps B phases on and cuts off AC two phases, and the second switch group keeps A phases and B phases disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground.
When ABC three-phase interphase is short-circuited and a ground fault occurs at a short-circuit point, the first switch group keeps the A phase on and cuts off the BC two phases, and the second switch group keeps the A phase and the B phase off from the ground; or the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground.
In the above embodiment, in order to perform current limiting when a current pulse or a current duration is subsequently injected, an adjustable resistor 5 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 bar. The adjustable resistor 5 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 calculated by the voltage and current value when a fault happens when the fault happens.
In the above embodiment, the three single-phase switches in the first switch group 1 are further used in conjunction with the current detection module 6, and when the current detection module 6 detects that the current pulse number or the current duration of a certain phase exceeds a preset value, the control module 4 causes the single-phase switch to trip the circuit, so that the single-phase switch 101 can also be used as a controlled switch for automatically removing interphase faults in subsequent processing (for removing interphase short-circuit faults by using the controlled switch, see the patent application 202011492758.3 and the patent application 202011453632.5).
The above embodiments are only a few descriptions of the inventive concept and implementation, and are not limited thereto, and the technical solutions without substantial transformation remain within the scope of protection under the inventive concept.
Claims (5)
1. An auxiliary device for processing interphase short circuit comprises a first switch group and a second switch group, and is characterized in that,
the first switch group comprises three single-phase switches which are respectively connected with a bus and an ABC three-phase outlet;
the second switch group comprises two single-phase switches which are respectively connected with any two phases in the outlet wire of the lower opening of the first switch group and the ground;
further comprises:
the interphase short circuit identification module is used for identifying whether interphase short circuit occurs, a fault phase occurs, whether interphase short circuit is cut off or not, and whether an attached ground fault occurs or not;
the control module is used for respectively controlling the first switch group and the second switch group according to the identification result of the interphase short circuit identification module, and the first switch group and the second switch group act according to the following logic:
when a simple two-phase or three-phase interphase short circuit occurs, the processing is performed according to the following logic (a):
(a) Maintaining the conduction of one fault phase through the first switch group and cutting off the other two phases, and connecting the other fault phase through the second switch group;
when a two-phase or three-phase-to-phase short circuit occurs and a ground fault occurs at the short circuit point, the processing is performed according to the logic (a) or the processing is performed according to the following logic (b):
the first switch group maintains a fault phase to be conducted and cuts off the other two phases, and the second switch group is kept to be disconnected.
2. The apparatus for assisting in handling interphase short circuits according to claim 1, wherein: the control module respectively controls the first switch group and the second switch group to act according to the following logic:
(a) When the second switch group is connected with BC two phases and the ground:
when the AB two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps the A phase conducting and cuts off the BC two phases, and the second switch group conducts the B phase to the earth;
when the AC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps the A phase conducting and cuts off the BC two phases, and the second switch group conducts the C phase to the earth;
when BC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps B phases conductive and cuts off AC two phases, and the second switch group conducts C phases to the earth; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the B phase to the ground;
when ABC three-phase simple interphase short circuit or simultaneously attached ground fault, the first switch group keeps the A phase conducting and cuts off the BC two phases, and the second switch group conducts the B phase or the C phase to the ground; or the first switch group keeps B phase conductive and cuts off AC two phases, and the second switch group conducts C phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the B phase to the ground;
(b) When the second switch group is connected with AC two phases and the ground:
when the AB two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps B phases conducting and cuts off AC two phases, and the second switch group conducts A phases to the earth;
when the AC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps the A phase conducting and cuts off the BC two phases, and the second switch group conducts the C phase to the earth; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the A phase to the ground;
when BC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps B phases conductive and cuts off AC two phases, and the second switch group conducts C phases to the earth;
when ABC three-phase simple interphase short circuit or simultaneously has an earth fault, the first switch group keeps the A phase conductive and cuts off the BC two phases, and the second switch group conducts the C phase to the earth; or the first switch group keeps B phase conductive and cuts off AC two phases, and the second switch group conducts C phase or A phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the A phase to the ground;
(c) When 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 simultaneously have an earth fault, the first switch group keeps B phases conducting and cuts off AC two phases, and the second switch group conducts A phases to the earth; or the first switch group keeps the A phase conductive and cuts off the BC phase, and the second switch group conducts the B phase to the ground;
when the AC phase is simply and alternately short-circuited or simultaneously has a ground fault, the first switch group keeps the C phase conductive and cuts off the AB phase, and the second switch group conducts the A phase to the ground;
when BC two phases are simply in interphase short circuit or simultaneously have an earth fault, the first switch group keeps C phase conduction and cuts off AB two phases, and the second switch group conducts B phase to the earth;
when ABC three-phase simple interphase short circuit or simultaneously has an earth fault, the first switch group keeps the A phase conductive and cuts off the BC two phases, and the second switch group conducts the B phase to the earth; or the first switch group keeps the B phase conductive and cuts off the AC two phases, and the second switch group conducts the A phase to the ground; or the first switch group keeps the C phase conductive and cuts off the AB two phases, and the second switch group conducts the A phase or the B phase to the ground;
or the control module respectively controls the first switch group and the second switch group to act according to the following logic:
(a) When the second switch group is connected with BC two phases and the ground:
when the AB two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the B phase and the C phase to be disconnected from the ground; or the first switch group keeps B phase on and cuts off AC two phases, and the second switch group keeps B phase and C phase disconnected from the ground;
when AC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the B phase and the C phase to be disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the B phase and the C phase disconnected from the ground;
when BC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps B phases on and cuts off AC two phases, and the second switch group keeps B phases and C phases disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the B phase and the C phase disconnected from the ground;
when ABC three-phase interphase is short-circuited and a ground fault occurs at a short-circuit point, the first switch group keeps the A phase on and cuts off the BC two phases, and the second switch group keeps the B phase and the C phase off from the ground; or the first switch group keeps B phase on and cuts off AC two phases, and the second switch group keeps B phase and C phase disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the B phase and the C phase disconnected from the ground;
(b) When the second switch group is connected with AC two phases and the ground:
when the AB two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground; or the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the C phase to be disconnected from the ground;
when AC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the C phase to be disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground;
when BC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps B phases on and cuts off AC two phases, and the second switch group keeps A phases and C phases disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground;
when ABC three-phase interphase is short-circuited and a ground fault occurs at a short-circuit point, the first switch group keeps the A phase on and cuts off the BC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground; or the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the C phase disconnected from the ground;
(c) When the second switch group is connected with the AB two phases and the ground:
when the AB two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the B phase off from the ground; or the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the B phase to be disconnected from the ground;
when AC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps the A phase to be conducted and cuts off the BC two phases, and the second switch group keeps the A phase and the B phase to be disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground;
when BC two phases are in short circuit and a ground fault occurs at a short circuit point, the first switch group keeps B phases on and cuts off AC two phases, and the second switch group keeps A phases and B phases disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground;
when ABC three-phase interphase is short-circuited and a ground fault occurs at a short-circuit point, the first switch group keeps the A phase on and cuts off the BC two phases, and the second switch group keeps the A phase and the B phase off from the ground; or the first switch group keeps the B phase on and cuts off the AC two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground; or the first switch group keeps the C phase on and cuts off the AB two phases, and the second switch group keeps the A phase and the B phase disconnected from the ground.
3. The apparatus for assisting in handling interphase short circuit according to claim 1, wherein an adjustable resistor is connected in series between the second switch block and ground.
4. The apparatus for assisting in handling interphase short circuit according to claim 1, wherein an adjustable resistor is connected in series between the first switch block and the bus bar.
5. The apparatus for assisting in handling interphase short circuits according to claim 1, wherein the single-phase switches of the first switching group trip when the number of current pulses or the current duration passed reaches a preset value.
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| CN202110063838.5A CN113644622B (en) | 2021-01-18 | 2021-01-18 | Device for assisting in processing interphase short circuit |
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| CN202110063838.5A CN113644622B (en) | 2021-01-18 | 2021-01-18 | Device for assisting in processing interphase short circuit |
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| CN113644622A (en) | 2021-11-12 |
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