CN1712978A - Self-adaptable dicrimination for permanent fault of high-voltage electrical network - Google Patents
Self-adaptable dicrimination for permanent fault of high-voltage electrical network Download PDFInfo
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- CN1712978A CN1712978A CN 200410010372 CN200410010372A CN1712978A CN 1712978 A CN1712978 A CN 1712978A CN 200410010372 CN200410010372 CN 200410010372 CN 200410010372 A CN200410010372 A CN 200410010372A CN 1712978 A CN1712978 A CN 1712978A
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Abstract
An adaptive method for judging permanent fault of high voltage electric network includes carrying out steps as the follows if system is closed on permanent fault, speeding up action of protective device at that place and transmitting action signal and analog quantity to equipment side through delay, acting differential criterion and quickly outputting after offside tripping signal is received by protective device at equipment side, and driving permanent jump relay to lock step of local side re-closed .
Description
Technical field
The present invention relates to a kind of Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids, belong to the electroporation field.
Background technology
High pressure, extra high voltage network all adopt the star-like mode of connection of three-phase type both at home and abroad at present, output AN, BN, CN three-phase supply, and its neutral point mostly is aerial earth wire, but all distinguishes ground connection at circuit two ends neutral point.Adopt the method for neutral-point solid ground, can effectively reduce equipment voltage-to-ground to a limited level, maximum is no more than Un, if isolated neutral, maximum voltage-to-ground may reach
Reduction equipment carries withstand voltage level over the ground, help greatly reducing the manufacturing and the field maintemance level of equipment, but in solidly earthed neutral system, if generation earth fault, will produce greatly to vagabond current, the electric current several times that overload or tens times, this can bring harm to some equipment such as transformer, generator etc., as thermally-stabilised, produce mechanical imbalance moment of torsion etc., if take place at short notice twice or repeatedly impact, very likely can cause the instability of device damage or electrical network.
Analyze according to domestic and international grid fault statistics, most at present grid faults are singlephase earth fault, account for 90% of whole faults, next is some double earthfaults that formed by the singlephase earth fault development, the probability of malfunction of other kinds is less, and it is permanent fault that 20% fault is arranged in singlephase earth fault approximately.The combination of general electrical network is always asymmetric;---big system, big system---mini system etc. as big unit; high-tension line adopts automatic reclosing to overlap once automatically more; send the possibility of merit with increase; but the reclosing that this nothing is selected can coincide with permanent fault; bring severe influence for the relay protection properties of product, and system stability and device security are brought danger.
Blindly overlap above-mentioned all adverse effects of bringing in order to reduce, the measure of taking at present has: 1, identified nature of trouble before overlapping, determine whether overlapping; 2, for the situation of discerning failsafe character, by calculating the optimum time of coincidence; 3, three coincide and change the branch phase sequence into and overlap.At present the three-phase reclosing is not still had effective permanent fault recognition methods, recognition methods has for the single-pole reclosing permanent fault, and line voltage waveform [1] after disconnecting by the identification isolating switch or the characteristic information that therefrom extracts come failure judgement character [2,3].Because the complicacy of reality system, the false voltage waveform is subjected to the influence of factors such as system operation mode, fault condition, fault preload state and atmospheric environment, and there is certain difficulty in the correct nature of trouble that identifies.For this situation, the measure of taking is to change the branch phase sequence into and overlap [6] and alleviate and coincide with permanent fault to the impact of system with to the damage of visual plant by calculating the optimum time of coincidence [4,5] or three-phase, improves system stability.Therefore, under situation that can not discern permanent fault, still might coincide with permanent fault, what can do at present is by select overlapping constantly or coincidence system reduces harm to system, but the circuit two ends still will coincide with permanent fault.To the asymmetric network structure that extensively exists in the system, how thoroughly to avoid in big unit-system big unit, the big system in big system-mini system coincides with permanent fault that the obvious practical using value is arranged.
Examine the document source:
[1] Yu Weiyong etc. based on the differentiation of the permanent and transient fault of waveform recognition. relay, 1999,27 (4).
[2] Li Bin etc. based on the single-phase adaptive reclosing of voltage harmonic signal analysis. electric power network technique, 2002,26 (10).
[3]F?Jiang?etc.The?Wavelet?Transform?Applied?to?Distinguish?betweenTransient?and?Permanent?Faults.1998?International?Conference?on?PowerSystem?Technology?Proceedings，Beijing?China，1998.
[4] Yuan Yuchun, Zhang Baohui etc. based on the CALCULATION OF THE OPTIMAL RECLOSING of EEAC. Automation of Electric Systems, 1999,23 (17).
[5] Zhang Baohui, Yu Yinghui. overlap the influence of the moment to the shaft system of unit torsional oscillation. Proceedings of the CSEE, 2001,21 (9).
[6] Yuan Yue, Zhang Baohui, Ge Yaozhong. the analysis and research that end adopts the high speed reclosing influence are sent in the generating plant. Power System and its Automation journal, 1996,8 (2).
Summary of the invention
At above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids.
For finishing above-mentioned purpose, the technical scheme that the present invention takes is: Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids may further comprise the steps:
A. the time-delay of the reclosing of set device is greater than system's reclosing time-delay;
If b. system coincides with permanent fault, then should accelerate motion by place's protective device, through time-delay actuating signal and analog quantity are transmitted in equipment side;
C. the equipment side protective device is received the offside trip signal, the differential criterion action, and outlet rapidly drives and jumps relay forever, originally stresses to close a floodgate with locking.
The reclosing time-delay of the said set device of above-mentioned steps a is greater than at least 30 milliseconds of system's reclosing time-delays; Said equipment is big unit or converting equipment.
The said system protection device of above-mentioned steps b promptly accelerates motion at the 5-20 millisecond that permanent fault takes place; Said system protection device delay time is 5 milliseconds; Said actuating signal comprises protection outlet, synchronous regime switching information; Said actuating signal and analog quantity adopt information code multiplexing technology to transmit to equipment side.
Advantage of the present invention and good effect are: (1) the present invention is based on the offside permanent fault recognition methods of optical fiber and digital passage, and whether switching value that offside sends and analog quantity can be judged offside and close in permanent fault.(2) the present invention can guarantee that equipment such as big unit avoids the impact of twice big electric current in the short time, effectively prevents expiring too early of big unit rotor torque fatigue lifetime, also can effectively prevent the impact second time that big electrical network is subjected to.After-acceleration trip signal when (3) the present invention coincides with fault with the offside protection is passed to this side; this side is closed in fault by offside analog quantity and self analog quantity identification opposite side of receiving; and then send and jump order forever; prevented that effectively this side from coinciding with permanent fault once more, can reach the purpose of locking reclosing.(4) adopt information code multiplexing technology,, can not influence and protect normal logic and responsiveness to switching informations such as offside transportation simulator amount and protection outlet, synchronous regimes.The present invention utilizes the passage redundancy feature of optical-fiber longitudinal difference protection; transmission by offside data volume and switching value; judge permanent fault; making originally stresses to close a floodgate no longer overlaps; avoided the impact of possible permanent fault to system; ensure the safe and stable operation of electrical network effectively, effectively protected the safety of grid equipments such as large-scale unit.
Description of drawings
Fig. 1 is the end adaptive reclose program flow diagram that closes earlier of the present invention;
Fig. 2 is for closing end adaptive reclose program flow diagram after of the present invention;
Fig. 3 is that the system of a specific embodiment of the present invention constitutes synoptic diagram.
Embodiment
The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
As Fig. 1, Fig. 2, shown in Figure 3, suppose that embodiment is 1 pair of system's 2 network of a big unit, troubles inside the sample space point f is very near from big unit.Both sides 3,4 protective device quick actings when breaking down, excision fault; at first set the reclosing time-delay of the reclosing time-delay of big unit 1 greater than system 2; and the time-delay of the reclosing of big unit 1 is greater than at least 30 milliseconds of system's 2 reclosings time-delays; as initialization system 2 reclosings time-delay Tzh2; set big unit 1 reclosing time-delay Tzh1; and set Tzh1=Tzh2+ Δ t, Δ t 〉=30 millisecond.When system 2 when reclosing time-delay Tzh2 closes a floodgate; big unit 1 does not also arrive the reclosing delay time; because system 2 coincides with permanent fault; this place's protection is promptly accelerated motion at the 5-20 millisecond; through 5 millisecond time-delay actuating signal and analog quantity are transmitted in big unit 1 side; actuating signal comprises switching informations such as protection outlet, synchronous regime, transmits to offside behind the above information coding framing.Offside trip signal and differential criterion action are received in the opposite side protection; think that offside coincides with fault; can export rapidly; drive and jump relay forever; originally stress to close a floodgate with locking, this moment, big unit 1 did not also arrive the reclosing delay time, so can not overlap outlet; so avoided coinciding with permanent fault, protected big unit to avoid standing the impact once more of big electric current in the short time effectively.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1, Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids is characterized in that: this method may further comprise the steps:
A. the time-delay of the reclosing of set device is greater than system's reclosing time-delay;
If b. system coincides with permanent fault, then should accelerate motion by place's protective device, through time-delay actuating signal and analog quantity are transmitted in equipment side;
C. the equipment side protective device is received the offside trip signal, the differential criterion action, and outlet rapidly drives and jumps relay forever, originally stresses to close a floodgate with locking.
2, according to right 1 described Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids, it is characterized in that: the reclosing time-delay of the said set device of step a is greater than at least 30 milliseconds of system's reclosing time-delays.
3, according to right 1 described Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids, it is characterized in that: the said equipment of step a is big unit or converting equipment.
4, according to right 1 described Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids, it is characterized in that: the said system protection device of step b promptly accelerates motion at the 5-20 millisecond that permanent fault takes place.
5, according to right 1 described Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids, it is characterized in that: the said system protection device delay time of step b is 5 milliseconds.
6, according to right 1 described Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids, it is characterized in that: the said actuating signal of step b comprises protection outlet, synchronous regime switching information.
7, according to right 6 described Permanent Fault Self-adaptive Judging Method For High-voltage Power Grids, it is characterized in that: said actuating signal of step b and analog quantity adopt information code multiplexing technology to transmit to equipment side.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100103729A CN100409018C (en) | 2004-06-25 | 2004-06-25 | Self-adaptable dicrimination for permanent fault of high-voltage electrical network |
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| CNB2004100103729A CN100409018C (en) | 2004-06-25 | 2004-06-25 | Self-adaptable dicrimination for permanent fault of high-voltage electrical network |
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| CN1712978A true CN1712978A (en) | 2005-12-28 |
| CN100409018C CN100409018C (en) | 2008-08-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100595991C (en) * | 2008-09-24 | 2010-03-24 | 天津大学 | Transmission line single phase self-adapting reclose implementing method based on fault point |
| CN101800419B (en) * | 2009-09-07 | 2012-05-02 | 上海市电力公司超高压输变电公司 | Implementation method of single-phase adaptive reclosure |
| CN103616598A (en) * | 2013-12-05 | 2014-03-05 | 国家电网公司 | Testing method for dynamic simulation of linkage between protective channel faults and line faults |
| CN108695818A (en) * | 2018-04-20 | 2018-10-23 | 西安理工大学 | A method of voltage dip depth is reduced by three_phase reclosing sequential |
| CN110707658A (en) * | 2019-10-18 | 2020-01-17 | 中国电力科学研究院有限公司 | AC line reclosing method and system for preventing DC continuous commutation failure |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03265413A (en) * | 1990-03-14 | 1991-11-26 | Hitachi Ltd | Distribution line protective device |
| CN2296083Y (en) * | 1997-05-28 | 1998-10-28 | 秦文波 | High-voltage line short-circuit fault property judging and protecting device |
| CN1141768C (en) * | 2001-12-28 | 2004-03-10 | 清华大学 | Digital travelling wave protection method for power transmission line and its relay and protection system |
-
2004
- 2004-06-25 CN CNB2004100103729A patent/CN100409018C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100595991C (en) * | 2008-09-24 | 2010-03-24 | 天津大学 | Transmission line single phase self-adapting reclose implementing method based on fault point |
| CN101800419B (en) * | 2009-09-07 | 2012-05-02 | 上海市电力公司超高压输变电公司 | Implementation method of single-phase adaptive reclosure |
| CN103616598A (en) * | 2013-12-05 | 2014-03-05 | 国家电网公司 | Testing method for dynamic simulation of linkage between protective channel faults and line faults |
| CN108695818A (en) * | 2018-04-20 | 2018-10-23 | 西安理工大学 | A method of voltage dip depth is reduced by three_phase reclosing sequential |
| CN108695818B (en) * | 2018-04-20 | 2020-03-31 | 西安理工大学 | Method for reducing voltage sag depth through three-phase reclosing time sequence |
| CN110707658A (en) * | 2019-10-18 | 2020-01-17 | 中国电力科学研究院有限公司 | AC line reclosing method and system for preventing DC continuous commutation failure |
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| CN100409018C (en) | 2008-08-06 |
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Assignee: Xuji Transformer Co., Ltd. Assignor: Xuji Electric Co., Ltd. Contract fulfillment period: 2008.12.26 to 2013.12.25 contract change Contract record no.: 2009410000004 Denomination of invention: Self-adaptable dicrimination for permanent fault of high-voltage electrical network Granted publication date: 20080806 License type: Exclusive license Record date: 2009.3.3 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.12.26 TO 2013.12.25; CHANGE OF CONTRACT Name of requester: XJ TRANSFORMER CO., LTD. Effective date: 20090303 |
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Effective date of registration: 20121204 Address after: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Patentee after: Xuji Electric Co., Ltd. Patentee after: State Grid Corporation of China Address before: 461000 No. 178, Jianshe Road, Henan, Xuchang Patentee before: Xuji Electric Co., Ltd. |
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Granted publication date: 20080806 Termination date: 20130625 |