CN102142674B - Method for selectively clearing single-phase ground fault of ship shore power system - Google Patents
Method for selectively clearing single-phase ground fault of ship shore power system Download PDFInfo
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- CN102142674B CN102142674B CN 201110028181 CN201110028181A CN102142674B CN 102142674 B CN102142674 B CN 102142674B CN 201110028181 CN201110028181 CN 201110028181 CN 201110028181 A CN201110028181 A CN 201110028181A CN 102142674 B CN102142674 B CN 102142674B
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Abstract
The invention discloses a method for selectively clearing a single-phase ground fault of a ship shore power system. A variable reactor is arranged between a system neutral point and the ground. When the system is in a single-phase ground fault, the occurrence of the single-phase ground fault is judged according to the rise of a neutral point voltage to ground after the ship shore power system is in a single-phase ground fault; after the single-phase ground fault occurs, the variable reactor is controlled to act within the range of a time angle phi 0 in one cyclic wave of the changes of the neutral point voltage to ground, thus the variable reactor is controlled to gradually decrease a reactance value, and an instaneous tripping mechanism of a corresponding circuit breaker is triggered by gradually increasing short-circuit current so as to clear the fault, wherein the ranges of the time angle phi 0 are as follows: phi 0 is not smaller than 0 DEG and not larger than 50 DEG, phi 0 is notsmaller than 105 DEG and not larger than 230 DEG, and phi 0 is not smaller than 285 DEG and not larger than 360 DEG; and before the circuit is completely disconnected, a fuse connected with a corresponding position of the variable reactor is fused, so that the system is restored to a low-current grounding state and the ablation of a contact of a circuit breaker is avoided.
Description
Technical field
The present invention relates to the method for the selective excision of a kind of electric supply installation single phase ground fault, be mainly used in shipping shore power system, can when system's generation single phase ground fault, selectively excise fast fault.
Technical background
The boats and ships ac power supply system adopts the three-phase three-wire system IT system usually, and power supply continuity is high, but needs step-down transformer could obtain single-phase 220V power supply, has increased construction and maintenance cost.And the three-phase four-wire system solidly grounded system does not need step-down transformer just can obtain single-phase 220V power supply, good economy performance.Because the single-phase power load amount of port and pier is large, therefore mostly adopt the three-phase four-wire system solidly grounded system, invest littlely, but power supply continuity is not high.Connect the bank electricity as directly drawing when boats and ships pull in to shore, ship housing is connected to the ground, and shipping shore power system is solidly grounded system, no matter be boats and ships generation single phase ground fault (often occuring), or harbour generation single phase ground fault, fault current is very large, causes system's tripping operation that is short-circuited; And the tripping operation poor selectivity might enlarge power failure range, and the huge short circuit current contact of breaker of can ablating.The probability that this kind situation occurs when overhauling is larger, and the shipping shore power system of having relatively high expectations for power supply continuity is unallowed.
For above-mentioned situation, to the experience of electric power system fault detect and failure removal, according to the characteristics of boats and ships and port and pier electric power system, designed the single phase ground fault selective ablation scheme that is used for shipping shore power system based on for a long time.Requirement and power supply-distribution system earthing mode commonly used according to protection; be chosen between electric power system neutral point and the ground and access variable reactor; make system become small current neutral grounding system; switch the reactance value of connecting system behind system's generation single phase ground fault by the control variable reactor; circuit breaker is selectively tripped; excise fast fault, guarantee the continued reliability of system power supply.
But after system's generation earth fault, as not controlling variable reactor action constantly, can cause the circuit breaker misoperation or be failure to actuate.The present invention is for finding out the best time of control variable reactor action, making corresponding circuit breaker correct operation; Simultaneously for solving the situation of arc erosion action breaker contact in the failure removal process, the present invention is at variable reactor relevant position access fuse, before respective circuit breakers disconnects fully on current supply circuit, corresponding fuse blows, system restPoses, and not only excises fault but also avoid contact of breaker to ablate.This programme why can be when system's generation single phase ground fault the excision fault of fast and reliable, and avoid the action breaker contact to ablate, the selection at variable reactor action moment angle and very important at variable reactor relevant position access fuse, constantly control the variable reactor action in the angular region at this, can reliably excise earth fault and avoid again contact of breaker to ablate.
Summary of the invention
The objective of the invention is, the method of selective ablation behind a kind of ship shore electric single phase ground fault is proposed, by monitoring system monitoring phase line grounding fault, carve in due course the action of control variable reactor, control variable reactor action in satisfactory moment angular region, fast and reliable excision fault guarantees that electric power system is safe and reliable, to reduce the harbour electric power system to the cost of the ship power supply that reaches port.Before circuit breaker disconnected fully, the fuse blows that links to each other with variable reactor avoided contact of breaker to ablate simultaneously.
Technical scheme of the present invention is: shipping shore power system single phase ground fault selective ablation method, between system neutral and ground, variable reactor is set, when system's generation single phase ground fault, raise to judge whether to occur single phase ground fault according to the neutral point voltage to earth.
Control variable reactor action in moment angular region of the present invention is after single phase ground fault occurs, in the cycle that the neutral point voltage to earth changes, at moment angle
Following scope in control variable reactor action,
Namely control variable reactor, reactance value is reduced gradually, trigger the moving tripping mechanism action of wink of respective circuit breakers by increasing gradually short circuit current, thus the excision fault.
Before circuit breaker disconnects fully, with the fuse blows that the variable reactor relevant position links to each other, make system recover the small current neutral grounding state, avoid contact of breaker to ablate.
Behind system's generation single-phase earthing, if still by neutral-point solid ground, short circuit tripping operation non-selectivity then.Between neutral point and ground, access variable reactor, monitor the variation of neutral point voltage to earth by monitoring system, send the action of control signal control variable reactor in good time, thereby increase short circuit current, trigger the moving tripping mechanism action of wink of the circuit breaker of earth fault phase, the excision fault, the fuse that is connected with variable reactor simultaneously disconnects front fusing fully at circuit breaker, avoids contact of breaker to ablate.
The method of ship shore electric single phase ground fault selective ablation, monitoring technology by means of the advanced person, make the neutral point of system by variable reactor ground connection, utilize circuit breaker wink to move the larger advantage of tripping mechanism operating current extreme difference, realize that circuit breaker selectively trips.Gather fault message as the basis take monitoring system, Short-way model is theoretical, and system improvement is basic.
Key of the present invention is to find out the best time of control variable reactor action, constantly controls the variable reactor action in the scope at this, can reliably excise short trouble and avoid again contact of breaker to ablate.
As shown in Figure 1: the short circuit current variation characteristic is as follows after system's generation single-phase short circuit:
In the formula
I is short circuit current in the formula, r
0And x
0Be line resistance and reactance, pass through the variable reactor of neutral point connecting system when x is single phase ground fault,
Be the moment angle of control variable reactor action in the cycle that the neutral point voltage to earth changes, the frequency of ω indication circuit system, the K control variable reactor action after the expression system earth of closing a floodgate.
By following formula as can be known: the size of current i (t) mainly by
Determine.
By analysis verification, after single-phase short circuit, in the cycle that the neutral point voltage to earth changes, at moment angle
Following scope in control variable reactor action, the transient current of its generation can trigger the moving tripping mechanism action of circuit breaker wink, reliably excises fault:
The method of ship shore electric single phase ground fault selective ablation of the present invention is: the neutral point voltage to earth raises behind system's generation single-phase earthing, be easy to monitoring, circuit breaker wink, moving tripping mechanism instantaneous operation electric current was differential larger, control variable reactor action in moment angular region of the present invention after the short circuit, can realize that after short circuit circuit breaker selectively trips, excise fast fault, simultaneously before circuit breaker disconnects fully, corresponding fuse blows avoids contact of breaker to ablate.
Technical solution of the present invention is: the moment angle of determining the variable reactor action.If system's generation single phase ground fault moves without the control variable reactor of time selectivity, described fuse blows can occur then but respective circuit breakers and do not disconnect; Or described circuit breaker disconnects and corresponding fuse does not have the situation of fusing, do not reach the purpose of selective ablation fault.So key of the present invention is to determine the moment of suitable control variable reactor action, so that control variable reactor action in the scope at this moment, circuit breaker reliably disconnects, and corresponding fuse in time fuses, both guarantee the system power supply reliability, and avoided again contact of breaker to ablate.
The invention has the beneficial effects as follows: control variable reactor action in moment angular region of the present invention, can reliably excise fault, mainly contain following features:
Failure removal mechanism of the present invention changes based on short circuit current, different variable reactor action, the short circuit current differences constantly controlled after short circuit.Earth fault can be reliably excised in the action of control variable reactor in described moment angular region.By monitoring system monitoring phase line grounding fault, carve in due course the action of control variable reactor, fault is excised in the action of control variable reactor fast in satisfactory moment angular region, the assurance electric power system is safe and reliable, reduces the harbour electric power system to the cost of the ship power supply that reaches port.Before circuit breaker disconnected fully, the fuse blows that links to each other with variable reactor avoided contact of breaker to ablate simultaneously.
The present invention can make the moving tripping mechanism action of circuit breaker wink selective, the excision system single-phase earth fault.
The present invention gathers fault message by monitoring system, the action of control variable reactor, and fault is excised in the action of control variable reactor fast in satisfactory moment angular region.The inventive method is simple, and is motivated, is active in one's movements effective removal system single phase ground fault, economical and energy saving.
Description of drawings
Fig. 1 single-phase-to-ground fault isoboles
Fig. 2 is shipping shore power system single phase ground fault illustraton of model of the present invention
Fig. 3 is the present invention's angle schematic diagram of the satisfactory moment (dash area)
Specific embodiments
Ship shore electric single phase ground fault selective ablation scheme, raise to judge whether to occur single phase ground fault according to neutral point voltage to earth behind the electric power system generation single-phase earthing, and the neutral point voltage to earth is easy to monitoring, can judge accurately whether system single phase ground fault occurs.
Between system neutral and ground, variable reactor is set, when system's generation single phase ground fault, control variable reactor action in moment angular region of the present invention, touch the moving tripping mechanism of wink of respective circuit breakers by increasing short circuit current, thereby the excision fault, simultaneously before circuit breaker disconnects fully, the fuse blows that links to each other with the variable reactor relevant position, make system recover small current neutral grounding system, avoid contact of breaker to ablate.
System's generation single-phase earthing, if or by neutral-point solid ground, then short circuit tripping operation non-selectivity or overstep tripping.Between neutral point and ground, access variable reactor, monitor the variation of neutral point voltage to earth by monitoring system, send the action of control signal control variable reactor in good time, thereby increase short circuit current, trigger moving tripping mechanism of circuit breaker wink, the excision fault, the fuse that is connected with variable reactor simultaneously disconnects front fusing fully at circuit breaker, avoids contact of breaker to ablate.
The key of this scheme is to determine suitable moment angle, constantly controls the variable reactor action in the angular region at this, can excise earth fault and avoid again contact of breaker to ablate.
Behind system single-phase earth fault, short circuit current changes, by following formula as can be known:
By following formula as can be known, the size of current i (t) mainly by
Determine.
The concrete example of using of system is: in the system as shown in Figure 2, behind the generation single phase ground fault, monitors the neutral point voltage to earth and changes, and in the cycle that its voltage to earth changes,
Or
Or
The time (as shown in Figure 3) control variable reactor action, can excise fast earth fault and avoid again contact of breaker to ablate.
According to Fig. 3 as can be known: in the cycle that the neutral point voltage to earth changes; in the action of the larger moment angle of voltage waveform slope (dash area among the figure) control variable reactor; can make corresponding circuit breaker reliable trip; again can be before circuit breaker disconnects fully; make corresponding fuse blows; avoid contact of breaker to ablate, and better at the larger moment angle control variable reactor action effect of slope, meet the requirement of protection system power supply reliability.
Control variable reactor k in above-mentioned moment angular region
1-k
10Action increases short circuit current, and circuit breaker instantaneous trip mechanism correct operation is at circuit breaker K
1-K
3Before disconnecting fully, the fuse (R that is connected with variable reactor
D1-R
D10) fusing, system restPoses, and has not only effectively excised fault and has guaranteed the power supply reliability of system but also avoided contact of breaker to ablate.
Claims (1)
1. shipping shore power system single phase ground fault selective ablation method is characterized in that between system neutral and ground variable reactor being set; When system's generation single phase ground fault, behind shipping shore power system generation single phase ground fault, the neutral point voltage to earth raises to judge whether to occur single phase ground fault, after single phase ground fault occurs, in the cycle that the neutral point voltage to earth changes, at moment angle
Following scope in control variable reactor action,
Namely control variable reactor, reactance value is reduced gradually, trigger the moving tripping mechanism of wink of respective circuit breakers by increasing gradually short circuit current, thus the excision fault;
Before circuit breaker disconnected fully, the fuse blows that links to each other with variable reactor made system recover the small current neutral grounding state, avoids contact of breaker to ablate.
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| CN 201110028181 CN102142674B (en) | 2011-01-26 | 2011-01-26 | Method for selectively clearing single-phase ground fault of ship shore power system |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102508118A (en) * | 2011-12-09 | 2012-06-20 | 江苏镇安电力设备有限公司 | Method for realizing grounding fault line selection of IT (information technology) power system and preparing neutral conductors |
| CN108152649B (en) * | 2017-12-26 | 2020-02-14 | 苏州科爱佳自动化科技有限公司 | Intelligent scanning protection system for line faults |
| CN107968386B (en) * | 2017-12-26 | 2019-12-31 | 苏州科爱佳自动化科技有限公司 | Circuit fault source removing method |
| CN108011369B (en) * | 2017-12-26 | 2024-02-13 | 江苏科技大学 | Ship shore power system with fault diagnosis and alarm functions |
| CN108039701B (en) * | 2017-12-26 | 2020-06-12 | 苏州科爱佳自动化科技有限公司 | Circuit fault protection system |
| CN108169624B (en) * | 2017-12-26 | 2020-02-14 | 北京德昌祥科技有限公司 | Circuit fault source positioning method |
| CN108152678B (en) * | 2017-12-26 | 2020-02-14 | 苏州科爱佳自动化科技有限公司 | Circuit fault automatic detection system |
| CN108155631B (en) * | 2017-12-26 | 2020-06-12 | 苏州科爱佳自动化科技有限公司 | Circuit ground fault removing system |
| CN108075452B (en) * | 2017-12-26 | 2020-06-09 | 苏州科爱佳自动化科技有限公司 | Self-protection system for power transmission line |
| CN109921394B (en) * | 2019-04-15 | 2021-05-04 | 江苏太航信息科技有限公司 | Ship automation device with fault removal function |
| CN115065026A (en) * | 2022-05-31 | 2022-09-16 | 青岛和瑞德电力科技有限公司 | A high tension cable fast-assembling wiring system for bank electricity |
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| SU1144167A1 (en) * | 1983-08-19 | 1985-03-07 | Волжское объединение по производству легковых автомобилей | Device for automatic control of inductance of earthing reactor |
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Effective date of registration: 20150215 Address after: 212028 Zhenjiang Industrial Park, Dantu New District, Jiangsu No. five weft Road, No. 18 Patentee after: Jiangsu Hongan Transformer Co., Ltd. Patentee after: Zhenjiang Power Supply Company, Jiangsu Prov. Power Co. Address before: 212028 Zhenjiang Industrial Park, Dantu New District, Jiangsu No. five weft Road, No. 18 Patentee before: Jiangsu Hongan Transformer Co., Ltd. |
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Inventor after: Qian Jin Inventor after: Ye Xiaosong Inventor after: Wu Zhenfei Inventor after: Tang Youhuai Inventor after: Xing Ming Inventor after: Ma Tao Inventor after: Shen Wei Inventor before: Qian Jin Inventor before: Wang Jinquan Inventor before: Ye Xiaosong Inventor before: Xu Ye Inventor before: Wu Zhenfei Inventor before: Tang Youhuai Inventor before: Xing Ming Inventor before: Ma Tao Inventor before: Shen Wei |