CN113725825A - Method for processing interphase short circuit of power supply system - Google Patents
Method for processing interphase short circuit of power supply system Download PDFInfo
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- CN113725825A CN113725825A CN202110420475.6A CN202110420475A CN113725825A CN 113725825 A CN113725825 A CN 113725825A CN 202110420475 A CN202110420475 A CN 202110420475A CN 113725825 A CN113725825 A CN 113725825A
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- 230000016507 interphase Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000004020 conductor Substances 0.000 claims abstract description 22
- 230000007935 neutral effect Effects 0.000 claims abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 230000001960 triggered effect Effects 0.000 claims description 6
- 238000003672 processing method Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Classifications
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- 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
- H02H7/28—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 for meshed systems
Abstract
The invention discloses a method for processing interphase short circuit of a power supply system, which is characterized in that when a two-phase or three-phase interphase short circuit occurs in a line, one fault phase of the line is maintained to be conducted, the other fault phase is tripped, and the other fault phase conducted with the one fault phase is connected with a common lead; and then, a charged phase or a neutral point of the power supply system except the fault phase is circularly connected with and disconnected from the public conductor to form a closed loop with the fault phase and generate current pulses, the current pulses are detected by using the controlled switches, and when one controlled switch reaches a trigger condition and cuts off the line, the fault can be discharged. The method can quickly locate the interphase short-circuit fault point section, can automatically, quickly and accurately remove the fault, can well improve the treatment quality of the interphase short-circuit fault, and improves the power supply safety.
Description
Technical Field
The invention relates to the field of power supply system fault processing, in particular to a processing method of a three-phase non-effective grounding power supply system after an interphase short circuit fault occurs.
Background
At present, when a line of a three-phase non-effective grounding power supply system is in an interphase short circuit, a common method is as follows: 1. the reclosing mode is adopted: the first breaker on the line is cut off firstly and then closed, if the first breaker is a transient phase-to-phase short circuit and is eliminated after the first breaker is closed, normal power supply is continued. And if the interphase short-circuit fault still exists after the first breaker is closed, the first breaker is cut off to wait for maintenance. 2. Adopting a time step difference matching method: the method can isolate a fault area, but for a fault with a fault point close to the power supply, a power supply system has long short-circuit current tolerance time and large impact on a power grid. 3. The first breaker is tripped after overcurrent, then the breaker is tripped at the last, if the fault occurs below the last breaker, the fault can be eliminated, otherwise, the first breaker is overlapped, and the fault current still exists, the first breaker is tripped after overcurrent, then the last but one breaker is cut off, if the interphase short circuit occurs between the last but one breaker and the last breaker, the fault can be eliminated, and by analogy, the breakers are sequentially and upwards cut off until the fault is eliminated. However, during this operation, the circuit breaker, which is not switched off, and the power supply system are constantly subjected to a large short-circuit current surge, which may cause damage to the lines if the time is too long or the number of times is too large. If the duration of the inter-phase short circuit cannot exceed 300 milliseconds and the tripping time of the circuit breaker is 100 milliseconds, generally, more than three circuit breakers are not suitable for the line, otherwise, the method can cause the impact of the line exceeding 300 milliseconds. Therefore, the existing interphase short circuit processing methods have the defects that the time consumption for processing faults is long and the faults cannot be automatically eliminated.
Disclosure of Invention
The invention aims to provide a method for processing interphase short circuit of a three-phase non-effective grounding power supply system, which can quickly locate an interphase short circuit fault point section, can automatically, quickly and accurately remove faults, can well improve the processing quality of the interphase short circuit fault and improve the power supply safety.
In order to achieve the purpose, the invention adopts the following technical scheme:
a processing method for interphase short circuit of a power supply system is characterized in that a plurality of controlled switches are distributed on the power supply system, and the controlled switches can detect current pulses and cut off a circuit according to the number of the current pulses;
when a two-phase or three-phase interphase short circuit occurs in a line, maintaining the conduction of a fault phase of the line, tripping off the other fault phases, and connecting the other fault phase conducted with the fault phase with a common lead; and then, circularly connecting and disconnecting a charged phase or a neutral point of the power supply system except the fault phase with the public conductor to form a closed loop with the fault phase and generate current pulses, setting the number of the current pulses triggered and cut by the controlled switches at the downstream of the power supply to be less than that of the current pulses triggered and cut by the controlled switches at the upstream of the power supply, and disconnecting the other fault phase from the public conductor after one controlled switch cuts off the line under the condition of reaching a trigger condition, so as to disconnect the charged phase or the neutral point from the public conductor.
Preferably, maintaining the failed phase conductive includes switching the failed phase on after tripping the failed phase, and not tripping the failed phase.
Preferably, a first circuit breaker of the one line is tripped, then the one fault phase is short-circuited at the first circuit breaker by a first switch to conduct the one fault phase, the first switch is the controlled switch, the other fault phase is connected to the common conductor at a first circuit breaker lower port by a third switch, the live phase is cyclically switched on and off with the common conductor at the first circuit breaker upper port by a second switch or the neutral point is cyclically switched on and off with the common conductor to form a closed loop with the one fault phase and generate a current pulse, after a certain controlled switch reaches a trigger condition to break the line, the first switch, the third switch and the stopping second switch are switched on with the common conductor, and then the first circuit breaker is closed.
Preferably, the second switch is a power electronic switch.
Preferably, the power electronic switch is an insulated gate bipolar transistor.
Preferably, when the controlled switch reaches a trigger condition to disconnect the line, a signal is sent to the second switch to stop the second switch from being connected to the common conductor.
Preferably, the magnitude of the current pulse is monitored, and when the instantaneous value of the current pulse reaches a preset value, the second switch is switched off to complete a pulse action, so as to control the peak value of each current pulse not to exceed the preset value.
Preferably, a current limiting resistor is connected in series in the closed loop.
Preferably, an adjustable resistor is connected between the second switch and the common lead in series.
The public lead is a conductive copper bar.
The invention has the beneficial effects that: after the interphase short-circuit fault occurs, the original fault current is cut off, current pulses are artificially manufactured and flow through all original fault loops or new loops of partial fault loops and are used for analyzing the fault. Specifically, a fault phase is maintained to be conducted, another fault phase is cut off and the fault phase is conducted with a charged phase, so that a detection loop that current passes through a fault point can be manufactured by utilizing a short circuit between two fault phases, a controlled switch on a line detects a current pulse, the number of the current pulses triggered and cut by the controlled switch on the downstream of a power supply is less than that triggered and cut by the controlled switch on the upstream of the power supply, and the controlled switches on the fault phase below the fault point of the interphase short circuit cannot enter a closed loop and no current pulse flows through, so that the first controlled switch above the fault point of the interphase short circuit is definitely cut off first, and the interphase short circuit fault is eliminated. In the method, the cut fault phase and the cut live phase are connected with the same common lead to manufacture a loop, the common lead can use a lead or a conductive copper bar, and compared with the method of connecting the cut fault phase and the live line with the ground, the method has the advantages that the common lead is more convenient and safer in some occasions, for example, for the power utilization scene that the bus and the outgoing line are both arranged in the switch cabinet, the method of connecting the common lead is adopted to save the construction cost compared with the method of connecting the ground.
Drawings
FIG. 1 is a schematic wiring diagram of an embodiment of the method of the present invention.
Detailed Description
The invention will be further illustrated by the following specific embodiments in conjunction with the accompanying drawings:
the three-phase power supply system is a common non-effective grounding system, a plurality of outgoing lines are arranged on a bus of the common three-phase power supply system, a plurality of controlled switches are arranged on each outgoing line, the controlled switches can detect current pulses on one phase, two phases or three phases of a line, and can cut off the three-phase line when the number of current pulses passing through any phase reaches a preset value. In a specific embodiment of the controlled switch, the controlled switch comprises a control unit, a current detection unit and an execution unit, wherein the current detection unit can respectively detect each phase current of the three-phase line, the control unit compares the number of current pulses detected by the current detection unit with a preset value, and can set the number of current pulses of any phase to reach the preset value and send a signal to enable the execution unit to cut off the three-phase line. Aiming at the preset value of the current pulse number triggering cut-off, the preset value of the controlled switch at the downstream of the power supply direction is smaller than the preset value at the upstream of the power supply direction, the upstream of the power supply direction is relatively closer to the power supply, the downstream of the power supply direction is relatively farther from the power supply, and the electric energy is emitted from the power supply and is transmitted from the upstream to the downstream. Or, when viewed from the upstream and downstream of the power supply direction, the farther the controlled switch from the power supply triggers the smaller preset value for switching off, the easier the trigger condition is reached first for switching off. In practice, the circuit breaker arranged on each outgoing line can detect the current pulse number flowing through the circuit breaker, and can set a certain phase or a plurality of phases to cut off the line after passing through a certain current pulse number, so that the circuit breaker can be used as a controlled switch.
As shown in fig. 1, in one embodiment, each outgoing line of ABC three phases is provided with a first breaker 90 near the bus, at the first bar breaker 90, a first switch 1 is installed, the first switch 1 includes three switches KA1, KB1 and KC1 installed on ABC three phases, the first switch is a controlled switch, that is, the switches KA1, KB1 and KC1 can be switched off according to the preset current pulse number, the first switch 1 can short-circuit a certain phase at the first breaker 90 (for example, after the first breaker 90 cuts off the line, the switch KA1 in the first switch 1 is closed, i.e. the a phase can be short-circuited to be turned on again by bypassing the first breaker 90), this allows the shorted phase to remain live even if the first circuit breaker is tripped (it is of course possible to keep the first circuit breaker from the beginning to one phase from being tripped, thus it is not necessary to utilize the first switch to make the short circuit and to be live from the beginning). A plurality of circuit breakers are provided below the first circuit breaker 90 (the circuit breakers below the first circuit breaker are used as controlled switches), and each circuit breaker can cut off a three-phase line according to the current pulse number of a certain phase. A third switch 3 is arranged at the lower port of the first breaker 90 of each outgoing line, and three switches KA3, KB3 and KC3 in the third switch 3 can respectively conduct any phase of the ABC three phases to a common lead L. Meanwhile, a second switch 2 is also installed on the bus (i.e. the second switch 2 is located at the upper port of the first breaker 90, or is installed between the system neutral point and the common conductor L, and only one phase switch is needed at this time), and the three switches KA2, KB2 and KC2 in the second switch 2 can respectively make and break the three phases of the bus and the common conductor L. If an inter-phase short circuit (such as a BC two-phase short circuit, or a three-phase short circuit) occurs at point F, the first pair of circuit breakers 90 are tripped to cut off the three-phase line, then one failed phase (such as phase B, and then switch KB1 is closed) is conducted and charged by closing one switch of the first switch 1, and then the other failed phase (i.e., phase C, and then switch KC3 is closed) is conducted to the common conductor L by using one switch of the third switch 3 at the lower port of the first pair of circuit breakers 90. Then, the A phase (the A phase is a charged phase) is circularly connected with and disconnected with the common lead L at the upper port of the first breaker through a switch KA2 in the second switch, so that the current pulse is repeatedly generated (or the C phase is circularly connected with and disconnected with the common lead through a switch KC2, a closed loop can be formed, and the current pulse is generated), the current pulse flows through the failed phase B phase via the second switch, the third switch and the interphase short-circuit point F, and when the number of current pulses reaches the trigger condition of the nearest controlled switch 91 above the interphase short-circuit point F, the controlled switch 91 cuts the line, and the phase short-circuit point F is excluded from the system (at this time, the controlled switch 92 is not cut because the trigger condition of the controlled switch 92 further upstream has not been reached, and the controlled switch 93 below the phase short-circuit point on the B phase does not operate because no current pulse flows). Then the switch KB1 on the first switch 1 is opened, the KC3 in the third switch 3 is opened, the KA2 in the second switch is stopped from being conducted with the common lead L, and finally the first breaker 90 is closed to restore the line power supply.
In one embodiment, the first circuit breaker can be controlled separately for three phases and has the function of a controlled switch, and then the first circuit breaker can be directly utilized to keep a fault on and jump off the other fault phases. Meanwhile, the number of current pulses for triggering the first breaker to cut off can be set to be maximum (namely more than that of the second breaker), if the breakers below the first breaker (used as controlled switches) are not tripped, the interphase short circuit is generated between the first breaker and the second breaker, and the first breaker is necessarily tripped according to the set triggering conditions, so that the fault is isolated.
In the above embodiment, the relationship between the trip time of the controlled switch, the time of the current pulse and the time interval between two adjacent current pulses may be adjusted, so that the controlled switch is tripped timely when the trigger condition is met, and the next current pulse is prevented from flowing, thereby preventing the controlled switch further upstream from tripping. This ensures that the trip switch-off is completed if the controlled switch reaches the switch-off condition before the next current pulse is sent out, thereby avoiding that one or more controlled switches which should be tripped off are also tripped unexpectedly because a plurality of current pulses are sent out before the controlled switch is tripped off, and unreasonable large-area power failure is caused. The processing method can also be used for eliminating faults when three-phase short circuit or grounding is caused at the interphase short circuit point.
In one embodiment, power electronic switches, such as insulated gate bipolar transistors, are used to effect short cycling on and off of the common conductor. Presently, igbts are capable of high power on and off and have microsecond order response, producing short circuit current pulses several milliseconds long.
In order to avoid the possibility, the instantaneous value of the current pulse can be detected by the current detection device, and the circuit is timely cut off when the instantaneous value of the current pulse is too large to exceed the preset value, so that the overcurrent protection is avoided. Alternatively, a suitable current-limiting resistor may be connected in advance, for example, an adjustable resistor may be connected in series with the second switch.
The above embodiments are only a few illustrations of the inventive concept and implementation, not limitations thereof, and the technical solutions without substantial changes are still within the scope of protection under the inventive concept.
Claims (10)
1. A processing method for interphase short circuit of a power supply system is characterized in that a plurality of controlled switches are distributed on the power supply system, and the controlled switches can detect current pulses and cut off a circuit according to the number of the current pulses;
When a two-phase or three-phase interphase short circuit occurs in a line, maintaining the conduction of a fault phase of the line, tripping off the other fault phases, and connecting the other fault phase conducted with the fault phase with a common lead; and then, circularly connecting and disconnecting a charged phase or a neutral point of the power supply system except the fault phase with the public conductor to form a closed loop with the fault phase and generate current pulses, setting the number of the current pulses triggered and cut by the controlled switches at the downstream of the power supply to be less than that of the current pulses triggered and cut by the controlled switches at the upstream of the power supply, and disconnecting the other fault phase from the public conductor after one controlled switch cuts off the line under the condition of reaching a trigger condition, so as to disconnect the charged phase or the neutral point from the public conductor.
2. The method for handling interphase short circuit of the power supply system according to claim 1, wherein maintaining the one failed phase conductive includes switching the one failed phase off first and then switching the one failed phase on, and not switching the one failed phase off.
3. A method of handling a phase-to-phase short circuit in a power supply system according to claim 1, wherein a first breaker of said one line is tripped, then said one faulty phase is short-circuited at the first breaker by a first switch to conduct said one faulty phase, the first switch is said controlled switch, said other faulty phase is connected to said common conductor at a first breaker lower port by a third switch, said live phase is cyclically switched on and off with said common conductor at said first breaker upper port by a second switch or a neutral phase is cyclically switched on and off with said common conductor to form a closed loop with said one faulty phase and generate a current pulse, and after a certain one of said controlled switches reaches a trigger condition to disconnect the line, said first switch, third switch and said second switch are opened to said common conductor, the first circuit breaker is then closed.
4. The method for processing interphase short circuit of the power supply system according to claim 3, wherein the second switch is a power electronic switch.
5. The method for processing interphase short circuit of the power supply system according to claim 4, wherein the power electronic switch is an insulated gate bipolar transistor.
6. A method for handling a power supply system phase-to-phase short circuit as claimed in claim 3, wherein when said controlled switch reaches a trigger condition to disconnect the line, a signal is sent to said second switch to stop the second switch from connecting to said common conductor.
7. The method for processing interphase short circuit in power supply system according to claim 1, wherein the magnitude of the current pulse is monitored, and when the instantaneous value of the current pulse reaches a preset value, the second switch is turned off to complete a pulse action, thereby controlling the peak value of each current pulse not to exceed the preset value.
8. The method for processing the interphase short circuit of the power supply system according to claim 1, wherein a current-limiting resistor is connected in series in the closed loop.
9. The method for handling interphase short circuit of the power supply system according to claim 1, wherein an adjustable resistor is connected in series between the second switch and the common conductor.
10. The method for processing interphase short circuit of the power supply system according to claim 1, wherein the common lead is a conductive copper bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110420475.6A CN113725825B (en) | 2021-04-19 | 2021-04-19 | Method for processing interphase short circuit of power supply system |
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| CN202110420475.6A CN113725825B (en) | 2021-04-19 | 2021-04-19 | Method for processing interphase short circuit of power supply system |
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| CN113725825B CN113725825B (en) | 2023-12-05 |
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