CN113949045B - Method for eliminating interphase short circuit of three-phase power system - Google Patents
Method for eliminating interphase short circuit of three-phase power system Download PDFInfo
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- CN113949045B CN113949045B CN202110736385.8A CN202110736385A CN113949045B CN 113949045 B CN113949045 B CN 113949045B CN 202110736385 A CN202110736385 A CN 202110736385A CN 113949045 B CN113949045 B CN 113949045B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000016507 interphase Effects 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 239000004020 conductor Substances 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 description 14
- 230000001629 suppression Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Abstract
The invention discloses a method for eliminating interphase short-circuit faults of a three-phase power system, which comprises a power supply and a circuit, wherein a plurality of controlled switches are arranged on the circuit, the controlled switches can detect current signals and trip when the current signals reach preset conditions, when the interphase short-circuit faults occur on the circuit, a first controlled switch close to the power supply cuts off fault current, then a fault phase lead from the first controlled switch to the interphase short-circuit fault point, a current limiting resistor and a detection loop of the ground are constructed by utilizing fault phase single-phase to ground voltage, and current signals are generated, the controlled switches detect the current signals and trip according to the preset conditions, and the controlled switches close to the power supply are tripped later than the controlled switches far away from the power supply. The method can effectively remove interphase short-circuit faults, and is simpler in structure and convenient to implement.
Description
Technical Field
The invention relates to the field of power system protection, in particular to a method for eliminating interphase short circuit of a three-phase power system.
Background
At present, when an inter-phase short circuit occurs on a certain circuit of a three-phase power system, the following elimination 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. The invention patent application 2020114536325 and the invention patent application 2020114536310 provide 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 needs to connect the system bus or neutral point with the ground by using a signal generating switch, and also needs to connect the tripped outlet with the ground by using a switch, so that the structure is complex.
Disclosure of Invention
The invention aims to provide a method for removing interphase short circuit of a three-phase power system, which can effectively remove interphase short circuit faults, has a simpler structure and is convenient to implement.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for eliminating the phase-to-phase short-circuit fault of three-phase electric power system includes such steps as providing a power supply and a circuit, arranging several controlled switches on said circuit, detecting current signals, tripping when current signals reach preset condition, cutting off fault current by the first controlled switch near to power supply, and constructing a detection loop including fault phase conductor from said first controlled switch to phase-to-phase short-circuit fault point, current-limiting resistor and ground by using the single-phase voltage of fault phase to generate current signals, and tripping the controlled switch near to power supply according to said preset condition.
Preferably, the current signal is a current pulse or a continuous current, and the current pulse is generated by circularly switching on and off the detection loop or the continuous current is generated by continuously switching on the detection loop; the method comprises the steps of setting the number of current pulses of the controlled switch trigger trip close to the power supply to be more than the number of current pulses of the controlled switch trigger trip far from the power supply, or setting the current duration of the controlled switch trigger trip close to the power supply to be longer than the current duration of the controlled switch trigger trip far from the power supply.
Preferably, when the line has an interphase short-circuit fault, the first controlled switch cuts off at least one fault phase to cut off fault current and maintain the conduction of the other fault phase, and then the cut off fault phase is connected with the ground at the lower port of the first controlled switch through a grounding switch and the current limiting resistor, and the grounding switch is circularly switched on and off to generate the current pulse or continuously switched on the grounding switch to generate continuous current.
Preferably, said maintaining the other faulty phase on comprises said first controlled switch switching on the other faulty phase via a switch connected in parallel with said first controlled switch after switching off the other faulty phase, or said first controlled switch switching on from start without switching off the other faulty phase.
Preferably, when the line has an interphase short-circuit fault, the first controlled switch cuts off at least one fault phase to cut off fault current and connects the cut off fault phase to the ground, and then cyclically switches on and off the other fault phase to generate current pulses or continuously switches on the other fault phase to generate continuous current.
Preferably, the current pulse or continuous current is generated by single-phase on-off control of the first controlled switch, or by single-phase on-off control of a switch connected in parallel with the first controlled switch.
Preferably, the current limiting resistor is connected in series to the fault phase or the fault phase conductor which is continuously conducted in a circulating way, or the current limiting resistor is connected in series between the cut-off fault phase and the ground.
Preferably, the current limiting resistor is an adjustable resistor.
In the above scheme, the characteristic that the neutral point is grounded (i.e. the neutral point is grounded through a small resistor or is grounded through an arc suppression coil) or other outgoing lines have capacitance effects to the ground when the neutral point is suspended is utilized to artificially construct a detection loop comprising a phase-to-phase short circuit fault point, a fault phase wire and the ground, the detection loop utilizes the single-phase voltage to the ground of the fault phase wire to generate a current signal, and the current signal can be regulated and controlled through on-off operation of a switch, so that the controlled switch can remove the fault after being cut off according to the preset information of the current pulse number or the current duration and the like. In the construction process of the detection loop, the system bus or neutral point is not grounded by using equipment alone, but the current signal is directly generated by utilizing the capacitance effect of other outgoing lines to the ground when the system neutral point is grounded or suspended, so that the system structure is simplified, and the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the related structure of a small-resistance grounded three-phase power system of the present invention;
fig. 2 is a schematic diagram of a related structure of an arc suppression coil grounding three-phase power system of the invention.
Fig. 3 is a schematic diagram of a related structure of a three-phase power system with a suspended neutral point.
Detailed Description
The invention is further illustrated by the following examples, taken in conjunction with the accompanying drawings:
in a three-phase power system in which the neutral point is not suspended, the neutral point is generally grounded through a small resistor or an arc suppression coil, and when a certain phase conductor is grounded as shown in fig. 1 and 2, a circuit can be formed with the grounded neutral point and a current can be generated. As shown in fig. 3, the three-phase system with the neutral point suspended is provided with a capacitor between the wire on the line and the ground, and when the wire of a certain phase is grounded, current can be generated. In the three-phase power system shown in fig. 1, 2 and 3, the three-phase power system comprises a power supply, a bus 3, a plurality of outgoing lines 1 and a load, wherein the outgoing lines 1 are distributed with a plurality of controlled switches, and the controlled switches comprise a first controlled switch 2 close to the power supply and other controlled switches 4 below the first controlled switch 2, the controlled switches 4 can detect current signals and trip when the detected current signals meet preset conditions (a circuit breaker can be cut off according to the current conditions, so the circuit breaker can be used as the controlled switch). According to the preset condition, the three-phase power system is also provided with a protection device, when an interphase short circuit occurs on an outgoing line, the protection device can detect and send out a control signal, for example, the first controlled switch 2 is enabled to cut off current, and the protection device such as optical fiber differential protection, 5G differential protection and the like is the prior art.
In one embodiment, the neutral point is grounded through a small resistor or arc suppression coil, when a two-phase-to-phase short-circuit fault occurs on the outgoing line, the first controlled switch 2 breaks away from one fault phase to cut off fault current and keeps the other fault phase conductive (the third phase is a non-fault phase and may or may not break away), the grounding switch 9 and the current limiting resistor 8 are arranged between the lower opening of the first controlled switch 2 and the ground, after the first controlled switch 2 breaks away from one fault phase, the grounding switch 9 connects the broken-away fault phase with the ground at the lower opening of the first controlled switch 2, thereby constructing a detection loop comprising the system neutral point, the phase-to-phase short-circuit fault point, the phase-to-phase conductor between the first controlled switch 2, and the grounding switch 9 and the current limiting resistor 8 and generating a current signal. If the grounding switch 9 is turned on and off cyclically, a current pulse can be generated, and if the grounding switch 9 is turned on continuously, a continuous current can be generated. The current limiting resistor 8 can be used for enabling the current of the detection loop to be in a desired range, for example, the current limiting resistor is set to be not less than 100 ohms, and the current value can be controlled to be below 60 amperes. In a preferred embodiment, the current limiting resistor 8 is an adjustable resistor, and the current value is controlled by adjusting the resistance value. The first controlled switch 2 and the controlled switch 4 each have a function of detecting a current signal and cutting off the current according to a preset condition, for example, the first controlled switch 2 and the controlled switch 4 can detect the number of current pulses, and the last controlled switch 4 on the outgoing line is set to detect one current pulse, i.e., trip, the last (penultimate) one controlled switch is set to detect two current pulse numbers and trip again, the last controlled switch is set to detect three pulse numbers and trip again, and so on, so that the nearest controlled switch upstream (upstream near the power supply side) of the interphase short-circuit fault point can be cut off, thereby accurately removing the fault. Similarly, the controlled switch can also detect the current duration, and the current duration detected by the last controlled switch is the shortest (such as 0 ms), then the current duration of the tripping trigger of the upward controlled switch is sequentially prolonged (such as sequentially increased by 100 ms), so that the controlled switch can act when continuous current is generated in the detection loop, and the upstream controlled switch nearest to the fault point trips. Of course, the function of the controlled switch for detecting the current pulse or the current duration cannot conflict with the current during normal operation of the power system, and the controlled switch can enter the detection role only after the inter-phase short circuit fault occurs. 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 controlled switch 4 close to the first controlled switch 2 later than the controlled switch 4 far from said first controlled switch 2, so that the fault can be accurately cleared. The first phase of the controlled switch 2 that remains on is switched off according to the number of current pulses or the current duration, and the number of current pulses is set to be maximum, or the current duration is set to be maximum, so that when the fault point is located between the first controlled switch 2 and the next nearest controlled switch 4, the first phase of the controlled switch 2 that remains on trips, thereby cutting off the fault. In this embodiment, the first controlled switch 2 cuts off one faulty phase while keeping the other faulty phase on, and in another embodiment, the first controlled switch 2 may cut off both faulty phases at the same time, and then conduct one faulty phase again through the switch 6 connected in parallel with the first controlled switch, which may also achieve the above-mentioned effect. Or in the third embodiment, the first controlled switch 2 cuts off the two fault phases, then the grounding switch 9 connects the cut-off fault phase with the ground, and the parallel switch 6 is circularly turned on and off to generate current pulses, or the parallel switch 6 is continuously turned on to generate continuous current, so that the controlled switch can be tripped to cut off the fault, and in this embodiment, the current limiting resistor can be connected between the grounding switch and the ground in series, or can be connected at the parallel switch 6 instead. In another embodiment, the phase switch of the first controlled switch 2 kept on may be cyclically turned on and off to generate a current pulse, or continuously turned on to generate a continuous current, in which case the parallel switch 6 is not required.
In an embodiment of a neutral point suspension system, when a three-phase-to-phase short circuit fault occurs, the first controlled switch 2 breaks two fault phases to maintain conduction of the other fault phase, so that fault current can be cut off, and then one of the broken two fault phases is connected to the ground from the lower port of the first controlled switch 2 through the grounding switch 9 and the current limiting resistor 8, so that a detection loop comprising a system single-phase voltage to ground, two fault phase conductors, a phase-to-phase short circuit fault point, a grounding switch, the current limiting resistor and the ground is constructed, and a current signal is generated by utilizing the fault phase conductor to ground single-phase voltage. The controlled switch 4 trips to cut off the fault according to a preset number of pulses or current duration by cycling the on-off ground switch 9 to generate a current pulse or by continuously turning on the ground switch 9 to generate a continuous current. Likewise, the three-phase fault phase may be turned off at the same time, the parallel switch 6 is used to conduct the connection between the one-phase fault phase and the power supply, and then the parallel switch 6 is turned on and off in a circulating manner to generate a current pulse, or the parallel switch 6 is turned on continuously to generate a continuous current, or the first phase switch which maintains on the controlled switch 2 is turned on and off in a circulating manner to perform single-phase control to generate a current pulse, or the first controlled switch is turned on continuously to generate a continuous current.
In the above embodiment, the current limiting resistor 8 may be an adjustable resistor, so that the resistance value is adjusted to make the current value of the generated current signal within the expected range.
For details of the number of current pulses or the duration of the current and the tripping sequence of the controlled switch, reference may be made to patent application 2020114536325 and patent application 2020114536310.
In the above embodiment, for the case where the arc suppression coil or the small resistor is mounted, the grounding switch 9 and the current limiting resistor 8 may be directly grounded as described above, or may be connected to a wire, and the wire may be connected to the ground terminal of the arc suppression coil or the small resistor.
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 (8)
1. A method for eliminating the phase-to-phase short-circuit fault of three-phase electric system includes such steps as providing several controlled switches on line, detecting current signals, tripping when current signals reach preset condition, cutting off fault current by the first controlled switch, constructing a detection circuit including the phase line from the first controlled switch to the phase-to-phase short-circuit fault point, grounding switch, current-limiting resistor and ground, generating current signals, detecting said current signals, tripping according to said preset condition, and tripping the controlled switch close to power supply later than the controlled switch far from power supply.
2. The method for removing an interphase short-circuit fault of a three-phase power system according to claim 1, wherein the current signal is a current pulse or a continuous current, and the current pulse is generated by circularly switching on and off the detection loop or the continuous current is generated by continuously switching on and off the detection loop; the method comprises the steps of setting the number of current pulses of the controlled switch trigger trip close to the power supply to be more than the number of current pulses of the controlled switch trigger trip far from the power supply, or setting the current duration of the controlled switch trigger trip close to the power supply to be longer than the current duration of the controlled switch trigger trip far from the power supply.
3. The method of removing a phase-to-phase short fault of a three-phase power system according to claim 2, wherein when the phase-to-phase short fault occurs in the line, the first controlled switch cuts off at least one fault phase to cut off fault current and maintains the other fault phase to be on, and then connects the cut off fault phase to the ground at a lower port of the first controlled switch via a ground switch and the current limiting resistor, and circularly turns on and off the ground switch to generate the current pulse or continuously turns on the ground switch to generate continuous current.
4. A method of clearing a phase-to-phase short circuit fault in a three-phase power system as claimed in claim 3 wherein said maintaining the other fault phase on includes said first controlled switch switching on said other fault phase again by a switch in parallel with said first controlled switch after said other fault phase is disconnected or said first controlled switch switching on from the beginning without disconnecting said other fault phase.
5. A method of removing a phase-to-phase short circuit fault in a three-phase power system according to claim 2, wherein when a phase-to-phase short circuit fault occurs in the line, the first controlled switch cuts off at least one of the fault phases to cut off fault current and connects the cut-off one of the fault phases to ground, and then cyclically switches on and off the other fault phase to generate a current pulse or continuously switches on the other fault phase to generate a continuous current.
6. The method for removing an interphase short-circuit fault in a three-phase power system according to claim 5, wherein the current pulse or continuous current is generated by single-phase on-off control of the first controlled switch or the current pulse or continuous current is generated by single-phase on-off control of a switch connected in parallel with the first controlled switch.
7. The method for eliminating interphase short-circuit fault in three-phase power system according to claim 5, wherein the current limiting resistor is connected in series to the cyclically conducting faulty phase or the continuously conducting faulty phase conductor, or the current limiting resistor is connected in series between the one faulty phase that has been cut off and the ground.
8. The method for removing an interphase short-circuit fault of a three-phase power system according to claim 1, wherein the current limiting resistor is an adjustable resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110736385.8A CN113949045B (en) | 2021-06-30 | 2021-06-30 | Method for eliminating interphase short circuit of three-phase power system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110736385.8A CN113949045B (en) | 2021-06-30 | 2021-06-30 | Method for eliminating interphase short circuit of three-phase power system |
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| CN113949045B true CN113949045B (en) | 2024-02-09 |
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| CN101436776A (en) * | 2008-12-15 | 2009-05-20 | 辽宁省电力有限公司锦州供电公司 | Grounding and line selection method for low current grounding system |
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| CN113949045A (en) | 2022-01-18 |
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