CN109473955B - Self-adaptive distribution line fault processing method based on circuit breaker - Google Patents
Self-adaptive distribution line fault processing method based on circuit breaker Download PDFInfo
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- CN109473955B CN109473955B CN201811356151.5A CN201811356151A CN109473955B CN 109473955 B CN109473955 B CN 109473955B CN 201811356151 A CN201811356151 A CN 201811356151A CN 109473955 B CN109473955 B CN 109473955B
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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 invention discloses a self-adaptive distribution line fault processing method based on a circuit breaker, which comprehensively utilizes fault characteristic quantity when the distribution line has a fault, can reduce the reclosing times of a transformer substation, reduce the impact on lines and equipment, reduce the power failure time of a non-fault section and realize the automatic isolation of short-circuit faults and ground faults by matching with one-time reclosing of an outgoing circuit breaker in the transformer substation and matching without a step difference between line feeder switches.
Description
Technical Field
The invention relates to the field of power distribution network fault processing, in particular to a self-adaptive distribution line fault processing method based on a circuit breaker.
Background
The faults of the power distribution network mainly include short-circuit faults and single-phase earth faults, the faults of the power distribution network are quickly, accurately and reliably processed, and the method has important significance for improving the power supply reliability and stability of the power distribution network and realizing reliable operation of the power distribution network.
The method mainly adopts voltage time type functional logic for automatically processing short-circuit faults by in-situ feeder lines in the existing power distribution network, the existing standard voltage time type feeder line switch only can take fault voltage as a fault criterion, a transformer station trips when a fault occurs, a transformer station is switched on after a primary stage of a standard voltage time type terminal is delayed after reclosing of the transformer station, the transformer station trips again after the switching-on is closed to a fault section, and fault isolation of a high-voltage distribution line fault section is completed; and the recovery power transmission of the non-fault section needs one-level delay switching-on, so that the power failure time of the non-fault section is greatly increased. In addition, the single-phase earth fault can be processed only by manually removing the stay wire, manually patrolling the wire to search for the fault, and the single-phase earth fault cannot be isolated, so that the manpower and material resources are consumed, and the economy is poor.
In summary, the conventional voltage-time type functional logic has the following technical disadvantages: delay switching-in is needed when secondary reclosing of the substation in the section without fault occurs, the power failure time of the non-fault section is prolonged, a protection blind area exists, and the power failure time of the non-fault section is prolonged; automatic fault isolation cannot be achieved for sections where a single-phase ground fault occurs.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a breaker-based adaptive distribution line fault handling method, which can reduce the number of reclosure times of a substation, reduce the power failure time in a non-fault section, and achieve automatic isolation of a short-circuit fault and a ground fault.
The technical scheme adopted by the invention for solving the problems is as follows:
a self-adaptive distribution line fault processing method based on a breaker comprises the following steps:
the line feeder switches are set to be uniform in fixed value, the power-on delay closing time is the same, the confirmation time after closing is the same, and the line feeder switches are matched in a stepless difference mode;
the distribution line has no fault, the transformer substation transmits power for the first time, the line feeder switch has no locking, and the line feeder switch is switched on in a delayed manner after power is obtained;
when a short-circuit fault or a ground fault occurs on a distribution line, an outgoing line breaker is switched off after detecting a fault current, the distribution line is in voltage loss, and a line feeder switch is not in voltage and is not in current switching off;
the outgoing line breaker is reclosed for the first time after a specific time, and the line feeder switch is sequentially switched on in a delayed mode after being electrified: if the fault is an instantaneous fault, the circuit feeder switch is successfully switched on, and the power distribution circuit recovers power supply; if the fault is a permanent fault, the line feeder switch at the front end of the fault point detects overcurrent fault amount within a set time after being switched on, the protection tripping is directly carried out, the switching-on is locked and switched off, meanwhile, the feeder outlet switch at the rear end of the fault point detects instant incoming calls, the switching-off is kept, the switching-on is locked and switched off reversely, the front end of the fault point automatically recovers power supply, and the rear end of the fault point stops supplying power.
Further, the rear end of the fault point automatically supplies power for switching on, remotely switches on or restores power supply in a field manual switching on mode through the interconnection switch.
Further, the power-on delay switching-on time is 5 seconds; and the confirmation time after closing is 3 seconds.
Further, the outgoing line breaker is reclosed for the first time after 1 second.
Further, when the fault of the distribution line is a ground fault, the outgoing line breaker detects that the fault current is a zero sequence current; and after the circuit feeder switch is switched on, the overcurrent fault quantity detected in the set time is the zero-sequence overcurrent fault quantity.
One or more technical schemes provided in the embodiment of the invention have at least the following beneficial effects: the fault characteristic quantity when the distribution line breaks down is comprehensively utilized, and the matching with the primary reclosing of an outgoing line breaker in a transformer substation and the matching of no difference between line feeder switches can reduce the reclosing times of the transformer substation, reduce the impact on lines and equipment, reduce the power failure time of a non-fault section and realize the automatic isolation of short-circuit faults and ground faults.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Figure 1 is a schematic diagram of a distribution line of one embodiment of the present invention prior to a fault;
figure 2 is a schematic diagram of a distribution line F point fault according to one embodiment of the present invention;
figure 3 is a schematic diagram of a distribution line fault after processing according to one embodiment of the invention.
Detailed Description
One embodiment of the invention provides a self-adaptive distribution line short-circuit fault processing method based on a circuit breaker, the method is based on an outgoing line circuit breaker and a plurality of line feeder switches in a power distribution network, the outgoing line circuit breaker detects short-circuit faults in the distribution line, the line feeder switches carry out fault isolation in a self-adaptive mode according to specific fault positions, and the method specifically comprises the following steps:
a1: the line feeder switches are set to be uniform in fixed value, the power-on delay switching-on time is the same and is 5s, the confirmation time after switching-on is the same and is 3 s, and the line feeder switches are matched without step difference;
a2: the distribution line has no fault, the transformer substation transmits power for the first time, the line feeder switch has no locking, and the line feeder switch is switched on in a delayed manner after power is obtained;
a3: when a short-circuit fault occurs in a distribution line, an outgoing line breaker is switched off after detecting a fault current, the distribution line is in voltage loss, and a line feeder switch is not in voltage and is switched off in a non-current manner;
a4: the outgoing line breaker is reclosed for the first time after 1 second, and the line feeder switch is sequentially switched on in a delayed manner after being electrified: if the fault is an instantaneous fault, the circuit feeder switch is successfully switched on, and the power distribution circuit recovers power supply; if the fault is a permanent fault, the line feeder switch at the front end of the fault point detects overcurrent fault amount within a set time after being switched on, the protection tripping is directly carried out, the switching-on is locked and switched off, meanwhile, the feeder outlet switch at the rear end of the fault point detects instant incoming calls, the switching-off is kept, the switching-on is locked and switched off reversely, the front end of the fault point automatically recovers power supply, and the rear end of the fault point stops supplying power.
In this embodiment, the fault characteristic quantity of the distribution line when short-circuit fault occurs is comprehensively utilized, and the distribution line is matched with the primary reclosing of the outgoing line breaker in the transformer substation without the step difference, so that the reclosing times of the transformer substation can be reduced, the impact on the line and equipment is reduced, the power failure time of a non-fault section is reduced, and the automatic isolation of the short-circuit fault and the ground fault is realized.
Further, another embodiment of the present invention further provides a method for processing a short-circuit fault of an adaptive distribution line based on a circuit breaker, which further includes the following steps:
a5: and the rear end of the fault point recovers power supply in an automatic switching-on, remote switching-on or field manual switching-on mode through the interconnection switch.
In the embodiment, after the isolation of the fault point is completed, the power supply of the area behind the feeder line outlet switch at the rear end of the fault point can be quickly recovered through the above mode, and the power failure time and the influence of a non-fault section are reduced.
Further, another embodiment of the present invention further provides a method for processing ground faults of a distribution line based on a circuit breaker, where the method is based on an outgoing circuit breaker and a plurality of line feeder switches in a distribution network, the outgoing circuit breaker detects ground faults in the distribution line, and the line feeder switches perform fault isolation adaptively according to specific fault locations, and specifically includes the following steps:
b1: the line feeder switches are set to be uniform in fixed value, the power-on delay switching-on time is the same and is 5s, the confirmation time after switching-on is the same and is 3 s, and the line feeder switches are matched without step difference;
b2: the distribution line has no fault, the transformer substation transmits power for the first time, the line feeder switch has no locking, and the line feeder switch is switched on in a delayed manner after power is obtained;
b3: when the distribution line has a ground fault, the outgoing line breaker is switched off after detecting zero sequence current, the distribution line is in no-voltage state, and the line feeder switch is switched off without voltage and current;
b4: the outgoing line breaker is reclosed for the first time after 1 second, and the line feeder switch is sequentially switched on in a delayed manner after being electrified: if the fault is an instantaneous fault, the circuit feeder switch is successfully switched on, and the power distribution circuit recovers power supply; if the fault is a permanent fault, the zero-sequence overcurrent fault amount is detected within a set time after the circuit feeder switch at the front end of the fault point is switched on, the trip is directly protected and the switch-on is locked, meanwhile, the feeder outlet switch at the rear end of the fault point detects an instant incoming call, the switch-off is kept and the switch-on is locked reversely, the front end of the fault point automatically restores power supply, and the rear end of the fault point stops power supply.
In this embodiment, the fault characteristic quantity of the distribution line when the ground fault occurs is comprehensively utilized, and the distribution line is matched with the primary reclosing of the outgoing line breaker in the transformer substation without the step difference, so that the reclosing times of the transformer substation can be reduced, the impact on the line and equipment is reduced, the power failure time of a non-fault section is reduced, and the automatic isolation of the short-circuit fault and the ground fault is realized.
Further, another embodiment of the present invention further provides a method for processing a ground fault of an adaptive distribution line based on a circuit breaker, which further includes the following steps:
b5: and the rear end of the fault point recovers power supply in an automatic switching-on, remote switching-on or field manual switching-on mode through the interconnection switch.
In the embodiment, after the isolation of the fault point is completed, the power supply of the area behind the feeder line outlet switch at the rear end of the fault point can be quickly recovered through the above mode, and the power failure time and the influence of a non-fault section are reduced.
The technical solution is further explained below with reference to the accompanying drawings,
the CB in fig. 1-3 is a substation outgoing line breaker, FB1, FB2 and FB3 are line feeder switches, LS1 is a tie switch, and the solid represents closing and the hollow represents opening. As shown in fig. 1, the distribution line is fault-free; as shown in fig. 2, a permanent short circuit or a ground fault occurs at point F, fault current or fault zero-sequence current is detected by all of CBs, FB1 and FB2, a substation outgoing line breaker CB is tripped in protection, and a line feeder switch FB1, FB2 and FB3 detect that a distribution line is out of power and is switched off; then, the outgoing line breaker CB is reclosed for the first time after 1 second, the line feeder switch FB1 is powered on and switched on in a delayed mode, fault current is not detected within set time after the switching-on, the line feeder switch FB1 is switched on successfully, the line feeder switch FB2 is powered on and switched on in a delayed mode, after the line feeder switch FB2 is switched on, if instantaneous fault occurs, power supply is recovered, if permanent fault occurs, fault current is detected within set time, then protection tripping is accelerated, and the switching-on is locked; and the line feeder switch FB3 detects the instant incoming call, keeps opening and reversely locks and closes the switch, and completes fault point isolation. And the interconnection switch LS1 is switched on in a delayed mode, and the line feeder switch FB3 is locked to keep switched off, so that the power supply switching of a non-fault section is completed.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means.
Claims (5)
1. A self-adaptive distribution line fault processing method based on a breaker is characterized by comprising the following steps:
the line feeder switches are set to be uniform in fixed value, the power-on delay closing time is the same, the confirmation time after closing is the same, and the line feeder switches are matched in a stepless difference mode;
the distribution line has no fault, the transformer substation transmits power for the first time, the line feeder switch has no locking, and the line feeder switch is switched on in a delayed manner after power is obtained;
when a short-circuit fault or a ground fault occurs on a distribution line, an outgoing line breaker is switched off after detecting a fault current, the distribution line is in voltage loss, and a line feeder switch is not in voltage and is not in current switching off;
the outgoing line breaker is reclosed for the first time after a specific time, and the line feeder switch is sequentially switched on in a delayed mode after being electrified: if the fault is an instantaneous fault, the circuit feeder switch is successfully switched on, and the power distribution circuit recovers power supply; if the fault is a permanent fault, the line feeder switch at the front end of the fault point detects overcurrent fault amount within a set time after being switched on, the protection tripping is directly carried out, the switching-on is locked and switched off, meanwhile, the feeder outlet switch at the rear end of the fault point detects instant incoming calls, the switching-off is kept, the switching-on is locked and switched off reversely, the front end of the fault point automatically recovers power supply, and the rear end of the fault point stops supplying power.
2. The adaptive distribution line fault handling method based on the circuit breaker according to claim 1, wherein the back end of the fault point recovers power supply by automatic switching, remote switching or on-site manual switching through a tie switch.
3. The adaptive distribution line fault handling method based on the circuit breaker according to claim 1, wherein the power-on delay switching-on time is 5 seconds; and the confirmation time after closing is 3 seconds.
4. The adaptive distribution line fault handling method based on the circuit breaker according to claim 1, wherein the outgoing circuit breaker is reclosed for the first time after 1 second.
5. The adaptive distribution line fault handling method based on the circuit breaker according to claim 1, characterized in that when the fault of the distribution line is a ground fault, the outgoing line circuit breaker detects that the fault current is a zero sequence current; and after the circuit feeder switch is switched on, the overcurrent fault quantity detected in the set time is the zero-sequence overcurrent fault quantity.
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| CN110401177A (en) * | 2019-06-26 | 2019-11-01 | 长安大学 | A kind of 10KV line protective devices and its application method |
| CN110970876A (en) * | 2019-12-12 | 2020-04-07 | 云南电力技术有限责任公司 | Feeder automation fault isolation method and device |
| CN112350287A (en) * | 2020-11-02 | 2021-02-09 | 国网山东省电力公司滨州市沾化区供电公司 | Device and method for processing faults of hybrid line of power distribution network |
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| CN103378583A (en) * | 2012-04-11 | 2013-10-30 | 深圳市金博联电力技术有限公司 | Feeder automation technical scheme based on intelligent rapid vacuum circuit breaker |
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