CN113725808B - Method for processing interphase short circuit of three-phase power system - Google Patents
Method for processing interphase short circuit of three-phase power system Download PDFInfo
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- CN113725808B CN113725808B CN202110618375.4A CN202110618375A CN113725808B CN 113725808 B CN113725808 B CN 113725808B CN 202110618375 A CN202110618375 A CN 202110618375A CN 113725808 B CN113725808 B CN 113725808B
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- 230000016507 interphase Effects 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005192 partition Methods 0.000 claims abstract description 77
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 238000003672 processing method Methods 0.000 claims abstract description 4
- 239000004020 conductor Substances 0.000 claims description 26
- 230000007935 neutral effect Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
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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
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The utility model discloses a processing method of interphase short circuit of a three-phase power system, wherein a plurality of partition switches are arranged on a circuit, the circuit is divided into a plurality of protection areas by the partition switches, and a plurality of section switches are arranged in the protection areas; when the line is in interphase short-circuit fault, the electric energy inlet partition switch cuts off fault current, then a detection loop comprising interphase short-circuit fault points and fault phases is constructed, controllable current is injected, and the sectional switch detects the controllable current and trips according to preset conditions so as to cut off the interphase short-circuit fault. The method not only can effectively cut off interphase short circuit faults, but also can reduce the power failure area, and simultaneously can reduce the use of a high-current cut-off switch, thereby effectively reducing the switch cost.
Description
Technical Field
The utility model relates to the field of power system protection, in particular to a method for processing interphase short circuit of a three-phase power system.
Background
At present, when an inter-phase short circuit occurs in a certain circuit of a three-phase power system, the following processing method is generally adopted: 1. the reclosing mode is adopted: the first breaker on the line is first cut and then closed again, and if there is a momentary phase-to-phase short circuit and this is eliminated after the first breaker has been closed, normal power supply is continued. If the phase-to-phase short fault still exists after the first breaker is closed, the first breaker is disconnected and the maintenance is waited. 2. The method adopts a time level difference matching method: the method can isolate a fault area, but for faults with fault points close to the power supply, the power supply system has long short-circuit current tolerance time and large impact on a power grid. 3. The first breaker is tripped when overcurrent occurs, then the load switch is tripped when no current is applied to the load switch at last (other load switches are in a closing state), then the first breaker is overlapped, if the fault occurs below the load switch at last, the fault can be removed, otherwise, the first breaker still has fault current after being overlapped, at the moment, the first breaker is tripped when overcurrent occurs, then the load switch at last but one is tripped when no current is applied to the load switch at last, then the first breaker is reclosed again, and if the interphase short circuit occurs between the load switch at last but one and the load switch at last, the fault can be removed. And the like, the load switch is turned off under no current in sequence upwards until the fault is cleared. However, during this operation, the power supply system is repeatedly subjected to a large short-circuit current surge, and if the number of times is excessive, damage to the line is caused, and the line troubleshooting time is also long. 4. And the circuit is provided with a breaker with fault current tripping capability, when a fault occurs, all the breakers are set to be tripped due to overcurrent, then the first breaker is switched on from the first breaker, the first breaker is switched on for a certain time without overcurrent, and the breaker is tripped due to overcurrent, so that the fault is eliminated. If the first breaker is successfully switched on, the overcurrent trip is blocked for a period of time, and during the period of time, the second breaker is switched on, and as the first breaker is already in overcurrent blocking, the second breaker is in overcurrent trip, so that the fault is eliminated. If there is no overcurrent then the next handle is closed and so on. The scheme requires that each breaker has the capability of cutting off large current, has high requirements on the breaker, has high manufacturing cost, and has complex logic and longer self-healing time. Therefore, the existing interphase short circuit treatment methods have the defects of long time consumption for treating faults, large impact on a system and high requirement on the capability of a switch to cut off large current. The utility model patent application 2020114536325 and the utility model patent application 2020114536310 disclose two methods for handling interphase short circuit, when interphase short circuit occurs, a detection loop comprising a fault phase and an interphase short circuit fault point is artificially constructed, and the purpose of tripping is triggered by using the pulse number or time length information of a switch detection current on the detection loop so as to cut off the fault point. The method does not carry out partition protection, firstly, a first breaker is tripped, so that users on the whole line are influenced, the power failure area is large, and in addition, the method does not clearly propose how to reduce the use of a large-current switch to cut off, thereby reducing the switch cost.
Disclosure of Invention
The utility model aims to provide a method for interphase short circuit of a three-phase power system, which not only can effectively cut off interphase short circuit faults, but also can reduce the power failure area, and simultaneously can reduce the use of a high-current cut-off switch, thereby effectively reducing the switch cost.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a processing method of interphase short circuit of a three-phase power system is characterized in that a plurality of partition switches are arranged on a circuit, the circuit is divided into a plurality of protection areas by the partition switches, and a plurality of sectionalizing switches are arranged in the protection areas; when the circuit generates interphase short-circuit fault, the electric energy inlet partition switch of the protection area where the interphase short-circuit fault point is located breaks at least one fault phase to cut off fault current, then a detection loop is constructed by utilizing the interphase short-circuit fault point to two fault phase wires between the electric energy inlet partition switch and the interphase short-circuit fault point, controllable current is injected into the detection loop, the controllable current is detected by the partition switch, tripping is carried out according to preset conditions, so that interphase short-circuit fault is cut off, and the preset conditions enable the partition switch close to the electric energy inlet partition switch to be later than the partition switch far away from the electric energy inlet partition switch to trip.
In the scheme, the circuit is divided into a plurality of protection areas, and a certain protection area is in interphase short circuit, and the partition switch of the protection area is only required to cut off fault current, so that the upper protection area does not need to be powered off, and the power outage area is effectively reduced. The artificial loop comprises a phase-to-phase short circuit fault point and two fault phase wires, so that the sectional switch in the protection area can discharge faults after being cut off according to the preset information such as the current pulse number or the current duration. Meanwhile, the technical scheme distinguishes the partition switch and the sectional switch, the partition switch cuts off the large current of the short circuit, and the sectional switch plays a cutting-off role in the detection loop of the structure, because the controllable current, namely the controllable small current signal, is injected into the detection loop, the sectional switch only needs to have the capability of cutting off the small current, the requirement on cutting-off performance is greatly reduced, and thus, the switching cost is effectively reduced.
Preferably, the controllable current is generated using electrical energy of the three-phase power system.
The scheme directly utilizes the electric energy of the three-phase power system, and simplifies the complexity of the detection loop structure.
Preferably, when an inter-phase short-circuit fault occurs, the power inlet partition switch trips at least one fault phase to cut off fault current and maintain conduction of another fault phase, and then connects the tripped one fault phase from a lower port of the power inlet partition switch to a ground or a common conductor, and then connects a charged phase other than the fault phase maintained to be conducted to the ground or the common conductor at an upper port of the power inlet partition switch or connects a neutral point of the three-phase power system to the ground or the common conductor to generate the controllable current.
The above scheme gives a specific method for manufacturing the detection loop by using the electric energy of the three-phase electric power system.
It is further preferable that a signal generating switch and a current limiting resistor are arranged between a bus or a neutral point of the three-phase power system and the ground, the signal generating switch is circularly connected and disconnected with the ground or a public wire to generate current pulses, the sectionalizing switch trips according to a preset current pulse number, and the number of current pulses for triggering the tripping of the sectionalizing switch close to the electric energy inlet sectionalizing switch is more than that for triggering the tripping of the sectionalizing switch far away from the electric energy inlet sectionalizing switch; or the signal generating switch is continuously connected with the ground or the public lead to generate continuous current, the sectionalizing switch trips according to preset current duration, and the current duration of the sectionalizing switch which is close to the electric energy inlet sectionalizing switch for triggering the trip is longer than the current duration of the sectionalizing switch which is far away from the electric energy inlet sectionalizing switch for triggering the trip.
The scheme further provides how to construct a detection loop and conduct current limiting through a current limiting resistor, so that controllable current with small current value is obtained. Meanwhile, the current pulse signal or the continuous current signal can be generated through the intermittent grounding (or the common conductor) or the continuous grounding of the signal generation switch cycle, so that the sectional switch can be used for detecting and tripping according to preset conditions.
Preferably, a differential protection system is arranged on the protection area, and when an inter-phase short circuit fault occurs, the differential protection system sends out a control signal to enable the electric energy inlet partition switch to trip at least one fault phase so as to cut off fault current.
The scheme gives that the power inlet partition switch cuts off fault current in a differential protection mode.
Preferably, the maintaining the other failed phase on includes switching on the other failed phase after switching off the other failed phase, or not switching off the other failed phase so as to be switched on from beginning.
The above scheme gives two specific ways of maintaining conduction.
Preferably, said connecting a tripped fault phase from the lower opening of said power inlet partition switch to ground or common conductor comprises connecting the tripped fault phase from the lower opening of said power inlet partition switch to ground or common conductor with said power inlet partition switch after disconnecting the tripped fault phase with said power inlet partition switch, or disconnecting the tripped fault phase from the lower opening of said power inlet partition switch with said power inlet partition switch and then connecting the tripped fault phase from the lower opening of said power inlet partition switch to ground or common conductor with another switch.
The scheme provides the functions of the electric energy inlet partition switch of tripping the fault phase and grounding the lower port of one fault phase or the common conductor, or the electric energy inlet partition switch only has the tripping function, and the grounding or the common conductor function is realized through the other switch.
Preferably, the signal generating switch is a one-phase thyristor or a two-phase independent thyristor or a three-phase independent thyristor; the current limiting resistor is an adjustable resistor or a resistor selector or a resistor with a fixed resistance value.
The scheme adopts the thyristor as the signal generating switch, and has the advantages of accurate and timely control. The adjustable resistor or the resistor selector is convenient for determining the resistance value according to actual conditions, and the current can be regulated and controlled better. The fixed resistance has the characteristics of practicality and convenience, for example, by using a resistor with the resistance value of more than 100 ohms, the current value of controllable current of a 10kV three-phase power system can be generally controlled below 100 amperes, so that the sectional switch can easily cut off the current, the performance requirement of the sectional switch is low, and the cost is effectively reduced.
Preferably, the current signal is generated using a power source other than the power source of the three-phase power system.
In the scheme, an external power supply can be adopted to construct the detection loop, so that the construction of the detection loop has more choices.
Preferably, the current signal is a current pulse, the electric energy inlet partition switch and the sectionalizing switch trip according to a preset current pulse number, and the number of current pulses for triggering the sectionalizing switch close to the electric energy inlet partition switch to trip is more than the number of current pulses for triggering the sectionalizing switch far away from the electric energy inlet partition switch to trip; or the current signal is continuous current, the electric energy inlet partition switch and the sectionalizing switch trip according to preset current duration, and the current duration of the sectionalizing switch which is close to the electric energy inlet partition switch for triggering trip is longer than the current duration of the sectionalizing switch which is far away from the electric energy inlet partition switch for triggering trip.
In the scheme, the setting rules of preset conditions are given for the current pulse number and the current duration, and the setting can ensure that the upstream (the side close to the power supply is upstream and the side far away from the power supply is downstream) sectionalizing switch closest to the interphase short-circuit fault point trips, so that the fault point is more accurately removed.
Preferably, the current limiting resistor is a resistor with a fixed resistance value, and the fixed resistance value is determined according to the load current of the sectionalizer with the smallest load current in all the sectionalizers in the three-phase power system.
In the above scheme, a preferred strategy for determining the resistance with a fixed resistance value is provided, namely, the resistance is determined according to the minimum load current of all the sectionalizers in the power system, so that the current value of the controllable current does not exceed the minimum current load of the sectionalizers, and the load current of other sectionalizers is not exceeded.
Preferably, the signal generating switch is a two-phase independent thyristor or a three-phase independent thyristor, and the thyristors are connected in parallel and then connected in series to the current limiting resistor.
The scheme provides a specific preferred method for connecting the current limiting resistor, and the structure is simple and practical.
Drawings
Fig. 1 is a schematic diagram of a three-phase power system related to the present utility model.
Detailed Description
The utility model is further illustrated by the following examples, taken in conjunction with the accompanying drawings:
as shown in fig. 1, a plurality of partition switches 2 are distributed on three lines 1 of a three-phase power system, and when an inter-phase short circuit occurs, a large current of several kiloamperes is generated, and the partition switches 2 have a large current cut-off function and can cut off the short circuit current. The partition switch 2 divides the line 1 into a plurality of protection areas 3, and for one protection area 3, the partition switch 2 positioned at the electric energy inlet is an electric energy inlet partition switch. A plurality of sectionalizers 4 are arranged in the protection area 3, and the sectionalizers 4 allow small-current cut-off switches, such as switches for cutting off 50 amperes of current, to be used, so that the performance requirements of the sectionalizers are low, and the cost can be reduced. Each protection zone 3 may be protected by a differential protection system (not shown in the figure) in a differential protection manner, and the differential protection system determines whether the current flowing in a certain protection zone 3 is equal to the current flowing out of the protection zone, and if the current is unequal and exceeds a threshold value, the fault such as inter-phase short circuit is indicated to occur, namely, the electric energy inlet partition switch 2 is tripped to cut off the current. The differential protection method is the prior art and will not be described here in detail. When an inter-phase short circuit occurs in a certain protection area by using differential protection and other technologies, the electric energy inlet partition switch 2 of the protection area can be tripped to cut off fault current (the two-phase short circuit can trip out one phase or two phases corresponding to the two-phase short circuit, and the three-phase short circuit can trip out two phases corresponding to the two-phase short circuit or three phases corresponding to the two-phase short circuit), but the partition switch 2 of the last protection area of the protection area is not tripped, so that the last protection area cannot be powered off, the power failure area can be thinned, and the power failure area is reduced. After the electric energy inlet partition switch 2 is tripped, a detection loop comprising interphase short circuit fault points and interphase short circuit fault points to fault phase wires between the electric energy inlet partition switch 2 in the protection area is artificially constructed, and controllable current is injected into the detection loop, wherein the controllable current refers to current with a current value in an expected range through loop control, particularly refers to current with a smaller current value, and can be easily cut off by the sectional switch, for example, the current value is smaller than 50 amperes. The sectionalizer 4 has a function of detecting a controllable current and cutting off the current according to a preset condition, for example, the sectionalizer 4 can detect the number of current pulses, and the last sectionalizer 4 in the protection area is set to detect one current pulse, i.e., trip, and the last (penultimate) sectionalizer 4 is set to detect two current pulse numbers and then trip, and then the last sectionalizer is set to detect three pulse numbers and then trip, and so on, the nearest sectionalizer upstream of the interphase short-circuit fault point can be cut off, thereby accurately removing the fault. Similarly, the current duration detected by the sectionalizer can be made to be the shortest (e.g. 0 ms), then the current duration of tripping triggered by the upward sectionalizer is sequentially prolonged (e.g. sequentially increased by 100 ms), so that the sectionalizer 4 can act when continuous current is generated in the detection loop, and the upstream sectionalizer closest to the fault point trips. Of course, the function of detecting the current pulse or the current duration of the sectional switch cannot conflict with the current during normal operation of the power system, and the sectional switch can enter the detection role only after the occurrence of the phase short-circuit fault. It is of course also conceivable to set other conditions than current pulses or current durations, the principle of which is still to trip the sectionalizer 4 close to the power inlet section switch 2 later than the sectionalizer 4 far from the power inlet section switch 2, so that the fault can be accurately removed.
In a preferred embodiment, the controllable current is generated by using the electric energy of a three-phase electric power system, which is as follows: when an inter-phase short-circuit fault occurs, the electric energy inlet partition switch 2 breaks one fault phase (for a two-phase short-circuit, if three-phase short-circuit, breaks two fault phases) to cut off fault current and keeps the other fault phase conductive (keeping conductive includes keeping conductive all the time without breaking off, or breaking off the partition switch 2 of the phase first, then re-conducting the phase through the parallel switch 6), then connecting the broken off fault phase from the lower opening of the electric energy inlet partition switch 2 to the ground or the common conductor, and then connecting a charged phase (which may be the upper opening of the broken off fault phase or the non-faulty phase) except for the conductive fault phase to the ground or the common conductor at the upper opening of the electric energy inlet partition switch, or connecting the neutral point (which is also charged) of the three-phase electric power system to the ground or the common conductor to generate the controllable current, thus constructing a detection loop. When the operation of tripping out one phase and grounding the phase at the lower opening of the switch is realized, a single-pole double-throw switch can be selected as the partition switch 2, for example, for a single-pole double-throw switch adopting a moving contact and a fixed contact, one fixed contact is connected with a power supply side wire, the moving contact is connected with a load side wire, and the other fixed contact is connected with the ground or a public wire. Such a zone switch allows the phase to be grounded or a common conductor at the lower port of the zone switch 2 after the phase has been tripped out (see patent application 2020115729274 and patent application 2021104982574 for disclosure of the use of a single pole double throw switch to be grounded after the phase has been tripped out). The phase may also be connected from the lower port of the partition switch 2 to ground or to a common conductor by a separate switch 9. One of the static contacts is connected with a power supply side wire, the movable contact is connected with a load side wire, and the other static contact is connected with the ground or a common wire. A signal generating switch 5 and a current limiting resistor 7 are arranged between a bus or a neutral point of the three-phase power system and the ground, the signal generating switch 5 circularly grounds and disconnects a live phase to generate current pulses, the sectionalizing switch 4 trips according to a preset current pulse number, and the number of current pulses for triggering the sectionalizing switch 4 close to the electric energy inlet sectionalizing switch 2 to trip is more than that for triggering the sectionalizing switch 4 far away from the electric energy inlet sectionalizing switch 2; or the signal generating switch is continuously grounded to generate continuous current, the sectionalizing switch trips according to preset current duration, and the current duration of the sectionalizing switch 4 close to the power inlet sectionalizing switch 2 triggering the trip is longer than the current duration of the sectionalizing switch 4 far from the power inlet sectionalizing switch 2 triggering the trip. For a specific way of constructing the detection circuit, reference may be made to the utility model patent application 2020114536325 and the utility model patent application 2020114536310, the relevant contents of which are incorporated by reference into the disclosure of this specific embodiment.
In a preferred embodiment, the signal generating switch 5 is a one-phase thyristor or a two-phase independent thyristor or a three-phase independent thyristor; the current limiting resistor 7 is an adjustable resistor or resistor selector (for the structure of the resistor selector, reference may be made to patent 2021202920032, and the disclosure of this embodiment is incorporated herein by reference). The thyristor is adopted as a signal generating switch, and the control is accurate and timely.
In another preferred embodiment, an external independent power supply is selected and forms a detection loop together with the interphase short-circuit fault point and the corresponding fault phase lead, the independent power supply can select a low-voltage power supply, and at the moment, controllable current with controllable current value can be generated even if a current limiting resistor is not connected in series, so that the sectional switch detects current pulse or current duration and trips according to preset conditions. For example, in one embodiment, the partition switch 2 is a three-phase independent single-pole double-throw switch, if an inter-phase short circuit fault occurs, the two corresponding fault phases are tripped, the fault phases are connected with an independent power supply to generate controllable current, a signal generating switch can be connected in series in the detection loop to generate current pulses or continuous current, and the independent power supply can send out current pulses and be detected by the sectionalizing switch.
In one embodiment, for a 10kV power system, a fixed resistor is directly connected in series in a detection loop, and the resistance value is not smaller than 100 ohms, so that a controllable current with a current value of tens of amperes is generated, and the fault point is detected by the sectionalizer 4 and easily cut off.
If the signal generating switch is a two-phase independent thyristor or a three-phase independent thyristor, the thyristors are connected in parallel and then are connected in series into the current limiting resistor 7.
In the above embodiments, regarding the principle and the details of operation of constructing a divided detection loop capable of cutting out interphase short-circuit fault points, reference may be made to the utility model patent application 2020114536325 and the utility model patent application 2020114536310, and the relevant contents are incorporated into the disclosure of this embodiment. Regarding the preset conditions for tripping the sectionalizer switch 4, reference may be made to the patent application 2020115174849 of the utility model, which gives an optimized setting method, the relevant content of which is incorporated into the present utility model as disclosed in the detailed description.
In the above embodiment, when the detection circuit is constructed, the lead of the open phase may be grounded at the lower port of the partition switch 2, and the signal generation switch 5 may be grounded, so that a closed detection circuit is formed through the ground and a current is generated. If the connected common conductor is tripped, the signal generating switch is also connected to the common conductor, thus forming a closed detection loop as well. In practice, the earth is a good conductor and can be used as a common conductor. In the cabinet environment, the electric energy inlet partition switch 2 of the first protection area can be connected with a common wire, and the signal generation switch is also connected with the common wire, so that the installation in the cabinet environment is facilitated, then the common wire is grounded, and the partition switches of other protection areas on the circuit can be grounded by connecting the trip point with the earth because the partition switches are far away from the cabinet, and a closed loop for detection can be formed by taking the earth as the wire because the common wire is also grounded.
The above embodiments are merely illustrative of the inventive concept and implementation and are not limiting, but the technical solutions without substantial transformation remain within the scope of protection under the inventive concept.
Claims (12)
1. A processing method of interphase short circuit of a three-phase power system is characterized in that a plurality of partition switches are arranged on a circuit, the circuit is divided into a plurality of protection areas by the partition switches, and a plurality of segment switches are arranged in the protection areas; when the circuit generates interphase short-circuit fault, an electric energy inlet partition switch of a protection area where an interphase short-circuit fault point is located cuts off fault current, then a detection loop is constructed by utilizing two fault phase wires between the interphase short-circuit fault point and the electric energy inlet partition switch and the interphase short-circuit fault point, controllable current is injected into the detection loop, the controllable current is detected by the sectionalizer switch, the interphase short-circuit fault is cut off by tripping according to preset conditions, and the sectionalizer switch close to the electric energy inlet partition switch is later than the sectionalizer switch far away from the electric energy inlet partition switch by the preset conditions.
2. The method for handling interphase short circuit of a three-phase power system according to claim 1, wherein the controllable current is generated using electric energy of the three-phase power system.
3. A method of handling interphase short-circuiting in a three-phase power system according to claim 2, wherein when an interphase short-circuiting fault occurs, said power inlet partition switch jumps at least one faulty phase to cut off fault current and maintain conduction of another faulty phase, and then connects a jumped faulty phase from a lower port of said power inlet partition switch to ground or a common conductor, and connects a charged phase other than the faulty phase maintained on to ground or a common conductor at an upper port of said power inlet partition switch or connects a neutral point of said three-phase power system to ground or a common conductor to generate said controllable current.
4. A method of handling a phase-to-phase short circuit of a three-phase power system according to claim 3, wherein a signal generating switch and a current limiting resistor are provided between a bus or neutral point of the three-phase power system and the earth, the signal generating switch is cyclically connected and disconnected with the earth or a common conductor to generate current pulses, the sectionalizer switch trips according to a preset number of current pulses, and the sectionalizer switch close to the power inlet sectionalizer switch triggers more current pulses to trip than the sectionalizer switch far from the power inlet sectionalizer switch triggers current pulses to trip; or the signal generating switch is continuously connected with the ground or the public lead to generate continuous current, the sectionalizing switch trips according to preset current duration, and the current duration of the sectionalizing switch which is close to the electric energy inlet sectionalizing switch for triggering the trip is longer than the current duration of the sectionalizing switch which is far away from the electric energy inlet sectionalizing switch for triggering the trip.
5. The method for handling interphase short circuit in a three-phase power system according to claim 1, wherein a differential protection system is provided on the protection area, and when an interphase short circuit fault occurs, the differential protection system sends out a control signal to cause the power inlet partition switch to trip at least one fault phase to cut off fault current.
6. A method of handling a phase-to-phase short circuit in a three-phase power system according to claim 3, wherein maintaining the other faulty phase on comprises switching the other faulty phase on after switching the other faulty phase off, or switching the other faulty phase off so as to switch on from start.
7. A method of handling a phase-to-phase short circuit in a three-phase power system as claimed in claim 3, wherein said connecting a tripped fault phase from the lower opening of said power inlet partition switch to ground or to a common conductor comprises connecting the tripped fault phase from the lower opening of said power inlet partition switch to ground or to a common conductor using said power inlet partition switch after disconnecting the tripped fault phase using said power inlet partition switch, or disconnecting the tripped fault phase from the lower opening of said power inlet partition switch to ground or to a common conductor using said power inlet partition switch and then connecting the tripped fault phase from the lower opening of said power inlet partition switch to ground or to a common conductor using another switch.
8. The method for processing interphase short circuit of a three-phase power system according to claim 4, wherein the signal generating switch is a one-phase thyristor or a two-phase independent thyristor or a three-phase independent thyristor; the current limiting resistor is an adjustable resistor or a resistor selector or a resistor with a fixed resistance value.
9. The method of handling interphase short circuits in a three-phase power system according to claim 1, wherein the controllable current is generated using a power source other than the power source of the three-phase power system.
10. The method for handling interphase short circuit in a three-phase power system according to claim 9, wherein the controllable current is a current pulse, the electric energy inlet sectionalizer and the sectionalizer trip according to a preset number of current pulses, and the number of current pulses for which the sectionalizer close to the electric energy inlet sectionalizer triggers trip is greater than the number of current pulses for which the sectionalizer far from the electric energy inlet sectionalizer triggers trip; or the controllable current is continuous current, the electric energy inlet partition switch and the sectionalizing switch trip according to preset current duration, and the current duration of the sectionalizing switch which is close to the electric energy inlet partition switch for triggering trip is longer than the current duration of the sectionalizing switch which is far away from the electric energy inlet partition switch for triggering trip.
11. The method for handling an interphase short circuit in a three-phase power system according to claim 8, wherein the current limiting resistor is a resistor of a fixed resistance value, and the fixed resistance value is determined according to a load current of a sectionalizer having a smallest load current among all sectionalizers in the three-phase power system.
12. The method for processing interphase short circuit of three-phase power system according to claim 8, wherein the signal generating switch is a two-phase independent thyristor or a three-phase independent thyristor, and the thyristors are connected in parallel and then connected in series to the current limiting resistor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110618375.4A CN113725808B (en) | 2021-06-03 | 2021-06-03 | Method for processing interphase short circuit of three-phase power system |
| PCT/CN2022/077126 WO2022252701A1 (en) | 2021-06-03 | 2022-02-21 | Processing method for phase-to-phase short circuit of three-phase power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110618375.4A CN113725808B (en) | 2021-06-03 | 2021-06-03 | Method for processing interphase short circuit of three-phase power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113725808A CN113725808A (en) | 2021-11-30 |
| CN113725808B true CN113725808B (en) | 2023-12-15 |
Family
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