CN1399382A - Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor - Google Patents
Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor Download PDFInfo
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- CN1399382A CN1399382A CN 02113159 CN02113159A CN1399382A CN 1399382 A CN1399382 A CN 1399382A CN 02113159 CN02113159 CN 02113159 CN 02113159 A CN02113159 A CN 02113159A CN 1399382 A CN1399382 A CN 1399382A
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Abstract
The present invention relates to protection technology for extrahigh and veryhigh voltage electric power system and is the fault-tolerant discrimination method for turn-to-turn shor-circuit protection of parallel reactor. It includes two parts of fault-tolerant discrimination method and real-time dynamic impedance compensation criterion. The fault-tolerant discrimination method includes reliable collection platform circuit and its use in collecting relevant data for fault-tolerant discrimination. The real-time dynamic impedance compensation is used for raising the sensitivity and reliability in judging the turn-to-turn shor-circuit failure of parallel reactor.
Description
Technical field
The invention belongs to field of power, particularly the relay protecting method of electric power system superhigh pressure, ultra high voltage (750KV) main apparatus.
Background technology
Relaying protection is power system operation safety, detection system fault and the important component part of excising fault real-time.Relaying protection in running safety detection, resist various interference, guarantee normal safe operation and the accurate judgement of breaking down and fast the main apparatus at excision fault initial stage to protect its equipment and not cause badly damaged and system safety is an important indicator.The terminal overvoltage that takes place of power transmission line played a crucial role when shunt reactor prevented that distributed constant from causing the load underloading in remote, superhigh pressure or ultra high voltage transmit electric power process.Because the electric power system feature forms reasons such as shunt reactor harmonic wave excess temperature, little serious vibration and causes the shorted-turn fault ratio higher.Shunt reactor operation quantity sharply increases in the electric power system of home and abroad; but its interturn short circuit protection is because of its simplex winding inductive electrical equipment reason; it is judged and is not seen innovation always and improve reliability, real-time sensitivity, its reliability service, malfunction monitoring and eliminating are very limited.
Summary of the invention
Purpose of the present invention is exactly in order to overcome the deficiencies in the prior art part, proposes a kind of highly sensitive, quick action, the fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor that reliability is high.
Technical solution of the present invention:
A kind of fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor is characterized in that may further comprise the steps:
A. utilize advanced data acquisition platform reliably, to running and each electric parameters high accuracy of fault generating process, gather in real time;
B. gather shunt reactor head end three-phase voltage, first and last end three-phase current at running and fault generating process, in real time jumping and calculate jumping of zero-sequence current, voltage with the power frequency amount;
C. gathering and sentencing in the process in real time, declaring each amount synchronously again by turn-to-turn short circuit fault tolerant re-judging equation group, it is declared equation group again and is:
i
1＞k
1i
1W (I)，
i
2＞k
1i
2W (II)，
ΔU＜k
2U
W (III)，
Δ 3I
0/ 3I
0W＞1 (IV) jumps
Δ 3U
0/ 3U
0W＞1 (V) jumps
With i
1, i
2Synchronous degree and angle be the benchmark amount of declaring, jumping synchronously with them adds the again amount of declaring of its excess-three, surpasses three amounts in five amounts and then is judged to be turn-to-turn (no ground connection) short circuit;
E. according in operation shunt reactor turn-to-turn short circuit (no ground connection) failure process, each is measured criterion and is:
Fault phase head end current i
1Greater than maximum operating currenbt i
1W, fault phase end current i
2Also greater than maximum operating currenbt i
2W, overflowing is more than about 1.01, i
1, i
2Appreciate and to declare by its angle synchronously, declare in real time in the same way, the inverse transition amount;
The fault phase terminal voltage descends to some extent, presses k
2≈ about 0.98 is the amount of declaring foundation, and its phase voltage bust is declared value soon by three synchronised sines;
Three equal value turn-to-turn short circuits, head end 3U for this reason can not take place synchronously generally
0, 3I
0With terminal 3I
0All have and i
1, i
2, Δ U jumps synchronously, ratio is greater than 1, above-mentioned five amounts are declared again simultaneously and rapidly to declare sensitive, reliably and shorted-turn fault, start the outlet loop tripping operation.
F. when turn-to-turn fault, as a fast speed asynchronous generation ground connection or an increase point time-delay assistant criteria, can move impedance mutually by calculating fault synchronously, carry out synchroballistic amount of resistance real-time by compensativity k ≈ 0.8, increase the sensitivity of the residual voltage amount of declaring, be with the angle comparison value of zero-sequence current:
If angle is earth fault in turn-to-turn short circuit or the compensating basin less than 90 °; Export tripping operation with common startup of fault tolerant re-judging equation group output, if angle is an external ground greater than 90 °, protection is failure to actuate.
Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor of the present invention; use high-speed data acquisition; real-time data signal is handled; the fault tolerant re-judging theory; utilize the sign mutation monitoring technology of shunt reactor generation turn-to-turn fault process; by declaring again real-time; the present invention will get five kinds of data and declare soon synchronously with the compensating impedance of real time data and judge its shorted-turn fault; it can be with differential; protection constitutes multinomial main protection or quick main backup protection; be applicable to 220KV and above all shunt reactors, have highly sensitive; quick action (the judgement time can reach 5ms); reliability height advantages such as (allowing a certain erroneous judgement or mistake to declare).
The present invention can reach following performance index:
1, synchronous fault-tolerant is declared interturn short circuit protection again, and its judgement time is less than 5ms;
2, synchronous fault-tolerant is declared interturn short circuit protection again, and its sensitivity can reach 1%, also can improve according to service data and truth adjustment coefficient;
3, synchronous fault-tolerant is declared interturn short circuit protection again increases real-time phase of impedance compensation, and declaring operate time again is about 10ms, and turn-to-turn short circuit sensitivity is about 3%;
4, fault tolerant re-judging increases real-time phase of impedance criterion formation interturn short circuit protection, and whole group action is less than 15ms.
The present invention is applicable to superhigh pressure, the protection of ultra high voltage (750KV) shunt reactor of 220KV and above electric pressure.
Description of drawings
Fig. 1 is applied to superhigh pressure shunt reactor protection configuration-system elementary diagram for the present invention.
Fig. 2 is a single-phase winding interturn short-circuit electric parameters variation schematic diagram of the present invention.
Fig. 3 is a dynamic compensation impedance principle polar plot.
Fig. 4 constitutes hardware block diagram for the principle of the invention.
Fig. 5 declares the low value oscillogram for voltage wink.
Embodiment
Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor of the present invention, its feature may further comprise the steps:
(1) utilizes advanced data acquisition platform reliably, for the fault tolerant re-judging data provide reliably, sensitive basis;
(2) to the running reactor winding head end voltage jump value Δ U that respectively is in parallel, first, end current i
1, i
2, synchronometer is calculated the zero sequence increment Δ 3U of three-phase voltage and electric current
0, Δ 3I
0
(3) electric current that will gather in real time, magnitude of voltage and angle variation do to judge synchronously that in real time wherein the head end voltage die is declared value synchronously soon by sine that this is quick wink to declare the basis;
(4) declare replying immediately soon by following equation group synchronously of above-mentioned each data acquisition;
Shunt reactor turn-to-turn short circuit, the action of no earth fault are declared equation group again and are:
i
1＞k
1i
1W (I)，
i
2＞k
1i
2W (II)，
ΔU＜k
2U
W (III)，
Δ 3I
0/ 3I
0W＞1 (IV) jumps.
Δ 3U
0/ 3U
0W＞1 (V) jumps.
In the equation group: i
1Be winding head end phase current, i
2For the terminal phase current of winding, declare process i
1, i
2Synchronously, same-phase jumps; k
1The appreciation coefficient is 1.01-1.10 or lower; k
2The depreciation coefficient is for about 0.95-0.98; " Δ " counted in real time for the sudden change back in the equation group; " W " is that normal peak is annotated mark;
(5) in declaring again simultaneously and rapidly, in synchronous five values, have and satisfy above-mentioned equation group condition (i more than three or three according to each real time data
1, i
2Same portion jump and angle is the benchmark criterion), then be judged to be shorted-turn fault, protection starts fast the outlet tripping operation;
(6) in the protection outlet loop, can increase by second compensating impedance according to service requirement and declare turn-to-turn short circuit and the winding internal short-circuit ground connection of holding concurrently, Arg[(3U
0+ U
b)/3I
0J]＜90 °, U
b=kz3I
0, 3U
0Be turn-to-turn short circuit residual voltage value, U
bBe the bucking voltage value that compensating impedance forms, 3I
0Be turn-to-turn short circuit zero-sequence current value, 3I
0J has been the phase shift value, z is for to calculate phase of impedance by synchronized sampling, k is that compensativity is got about 0.8, declare soon when its angle adds by the impedance-compensated degree of synchronized sampling＜90 ° the time be turn-to-turn short circuit and winding 0.8 to terminal earth fault, can with declare equation group synchronously again and start the outlet trip(ping) circuit synchronously.
The present invention proposes the embodiment of shunt reactor turn-to-turn short circuit fault tolerant re-judging method, be described in detail as follows in conjunction with each accompanying drawing:
Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor of the present invention is implemented in superhigh pressure or ultra high voltage (750KV) electric power system; its system's main electrical scheme as shown in Figure 1; wherein the equipment of shunt reactor line system comprises: transmission line 1; equivalence electric power system 2; 3 in both sides; corresponding bus 4; 5; both sides system busbar voltage transformer 6; 7; both sides line voltage distribution instrument transformer 8; 9; both sides line-breaker 10; 11; both sides shunt reactor high voltage side current instrument transformer 12; 13; terminal winding current instrument transformer 14; 15; both sides harmonic elimination reactor is connected to principal reactance device neutral point place; they are 16 years old; 17 is zero sequence current mutual inductor, both sides harmonic elimination reactor 18; 19, both sides shunt reactor circuit breaker 20; 21 (whether installing) according to system's setting.
The effect of each components and parts of power system device is respectively described below among Fig. 1:
(1) transmission line 1 is a shunt reactor compensation distributed capacitance, suppresses the terminal overvoltage of underloading system, is shunt reactor compensation object of protection.
(2) equivalent electric power system 2, the 3 two ends power-supply system that is transmission line, via line 1 is with electric weight and load transmission.
(3) two ends high voltage bus 4,5 is the both sides substation bus bar.
(4) voltage transformer 6,7 of two ends bus is one of running monitor signal, and the monitoring running status is used for the high voltage conversion and measures, and its secondary is 100V (a line voltage).
(5) voltage transformer 8,9 at transmission line two ends also is the monitoring running status; being used for the high voltage conversion measures; its secondary is 100V (a line voltage), and the voltage transformer at two side bus and circuit two ends will have different as its value of interturn short circuit protection signal measurement, especially when open-phase operation.
(6) two-termial line circuit breaker 10,11 is the run switch of transmission line and shunt reactor (generally), closure and excision transmission line and circuit---reactor group, if system is provided with shunt reactor circuit breaker 20,21, circuit and reactor independent operating, independent switching separately then.
(7) current transformer 12,13 of shunt reactor winding head end access high-pressure system is used for current transformation as one of operational monitoring signal, and its secondary is 5A or 1A (specified).
(8) shunt reactor winding end is connected into the Y type, and every threephase current transformer is 14,15 also one of for running monitor signal, and being used for current transformation is 5A or 1A (specified).
(9) shunt reactor winding end is except that phase-splitting monitoring, zero sequence current mutual inductor 16,17 and 14,15 synchronous monitoring zero-sequence current 3I
0Value is transformed to 1A (specified).
(10) because of system harmonics amount reason, shunt reactor main winding neutral point harmonic content is eliminated ground connection through 18,19 harmonic elimination reactors.
When Fig. 2 is the shunt reactor turn-to-turn short circuit, head end voltage Δ U, 3U
0, winding head end electric current Δ i
1, end current Δ i
2, first, terminal 3I
0Each electric parameters sudden change schematic diagram.Fig. 3 in the case as when adding auxiliary compensating impedance and declaring again by motional impedance value and 3I
0Head end sudden change make 3U
0Increment is (3U
0+ U
0) and 3I
0J declares polar plot again, improves turn-to-turn short circuit and differentiates sensitivity.
Fig. 4 implements block diagram for the principle of the invention, through hardware platform each electric parameters is measured instantaneous mutation accurately and fast, in real time, can be highly sensitive, apace with head end voltage die, 3U
0Jump, fault is first mutually, end current is synchronous, equidirectional jumps, first simultaneously, terminal 3I
0Also jump synchronously, finish shorted-turn fault fast, high accuracy declares again, increase the motional impedance compensation as needs and declare again and also in block diagram, show enforcement.
Fig. 5 relatively declares the phase low voltage value that is out of order for phase voltage or line voltage synchronously through sine, and this is that low-voltage technology is declared in very crucial survey, and it is declared speed and promptly finishes at 1-2ms.Among Fig. 5, t
1, t
2, t
3Be instantaneous three-phase values value of declaring, solid line, dotted line and dotted line are respectively U
a, U
b, U
cOr U
Ab, U
Bc, U
CaVoltage waveform, wink is declared the voltage die that is out of order fast.
Claims (1)
1, a kind of fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor is characterized in that may further comprise the steps:
A. utilize advanced data acquisition platform reliably, to running and each electric parameters high accuracy of fault generating process, gather in real time;
B. gather shunt reactor head end three-phase voltage, first and last end three-phase current at running and fault generating process, in real time jumping and calculate jumping of zero-sequence current, voltage with the power frequency amount;
C. gathering and sentencing in the process in real time, declaring each amount synchronously again by turn-to-turn short circuit fault tolerant re-judging equation group, it is declared equation group again and is:
i
1＞k
1i
1W (I)，
i
2＞k
1i
2W (II)，
ΔU＜k
2U
W (III)，
Δ 3I
0/ 3I
0W＞1 (IV) jumps
Δ 3U
0/ 3U
0W＞1 (V) jumps
With i
1, i
2Synchronous degree and angle be the benchmark amount of declaring, jumping synchronously with them adds the again amount of declaring of its excess-three, surpasses three amounts in five amounts and then is judged to be turn-to-turn (no ground connection) short circuit;
E. according in operation shunt reactor turn-to-turn short circuit (no ground connection) failure process, each is measured criterion and is:
Fault phase head end current i
1Greater than maximum operating currenbt i
1W, fault phase end current i
2Also greater than maximum operating currenbt i
2W, overflowing is more than about 1.01, i
1, i
2Appreciate and to declare by its angle synchronously, declare in real time in the same way, the inverse transition amount;
The fault phase terminal voltage descends to some extent, presses k
2≈ about 0.98 is the amount of declaring foundation, and its phase voltage bust is declared value soon by three synchronised sines;
Three equal value turn-to-turn short circuits, head end 3U for this reason can not take place synchronously generally
0, 3I
0With terminal 3I
0All have and i
1, i
2, Δ U jumps synchronously, ratio is greater than 1, above-mentioned five amounts are declared again simultaneously and rapidly to declare sensitive, reliably and shorted-turn fault, start the outlet loop tripping operation.
F. when turn-to-turn fault, as a fast speed asynchronous generation ground connection or an increase point time-delay assistant criteria, can move impedance mutually by calculating fault synchronously, carry out synchroballistic amount of resistance real-time by compensativity k ≈ 0.8, increase the sensitivity of the residual voltage amount of declaring, be with the angle comparison value of zero-sequence current:
If angle is earth fault in turn-to-turn short circuit or the compensating basin less than 90 °; Export tripping operation with common startup of fault tolerant re-judging equation group output, if angle is an external ground greater than 90 °, protection is failure to actuate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021131597A CN1297048C (en) | 2002-06-02 | 2002-06-02 | Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021131597A CN1297048C (en) | 2002-06-02 | 2002-06-02 | Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1399382A true CN1399382A (en) | 2003-02-26 |
| CN1297048C CN1297048C (en) | 2007-01-24 |
Family
ID=4742479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021131597A Expired - Lifetime CN1297048C (en) | 2002-06-02 | 2002-06-02 | Fault-tolerant discrimination method for turn-to-turn short-circuit protection of parallel reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1297048C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362718C (en) * | 2003-12-24 | 2008-01-16 | 北京四方继保自动化有限公司 | Fault-tolerant complex judging self adaption high voltage parallel reactor turn-to-turn protection |
| CN100369342C (en) * | 2003-11-27 | 2008-02-13 | 南京南瑞继保电气有限公司 | High-voltage shunt reactor protecting method between turns |
| CN102749517A (en) * | 2012-07-11 | 2012-10-24 | 北京四方继保自动化股份有限公司 | Method for monitoring and analyzing oscillation impedance measurement track of electric power system |
| CN107919651A (en) * | 2017-12-15 | 2018-04-17 | 国家电网公司华中分部 | One kind is taken out can reactor pumping energy winding inter-turn zero-sequenceprotection method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153414A (en) * | 1996-02-16 | 1997-07-02 | 骆德昌 | Variable value protection method and device for high-voltage transmission line |
-
2002
- 2002-06-02 CN CNB021131597A patent/CN1297048C/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100369342C (en) * | 2003-11-27 | 2008-02-13 | 南京南瑞继保电气有限公司 | High-voltage shunt reactor protecting method between turns |
| CN100362718C (en) * | 2003-12-24 | 2008-01-16 | 北京四方继保自动化有限公司 | Fault-tolerant complex judging self adaption high voltage parallel reactor turn-to-turn protection |
| CN102749517A (en) * | 2012-07-11 | 2012-10-24 | 北京四方继保自动化股份有限公司 | Method for monitoring and analyzing oscillation impedance measurement track of electric power system |
| CN107919651A (en) * | 2017-12-15 | 2018-04-17 | 国家电网公司华中分部 | One kind is taken out can reactor pumping energy winding inter-turn zero-sequenceprotection method and device |
| CN107919651B (en) * | 2017-12-15 | 2019-08-23 | 国家电网公司华中分部 | A kind of pumping energy reactor pumping energy winding inter-turn zero-sequenceprotection method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1297048C (en) | 2007-01-24 |
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Owner name: GUODIAN NANJING AUTOMATION CO., LTD. Free format text: FORMER OWNER: NANJING AUTOMATION CO., LTD., CHINA ELECTRONICS CORP. Effective date: 20121121 |
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Effective date of registration: 20121121 Address after: 211100 No. 8 SIEMENS Road, Jiangning Development Zone, Nanjing, Jiangsu Patentee after: Nanjing Guodian Nanjing Grid Automation Co., Ltd. Address before: 210003, No. 38, new exemplary Road, Nanjing, Jiangsu Patentee before: Nanjing Automation Co., Ltd., China Electronics Corp. |
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Granted publication date: 20070124 |