CN1299412C - Method for realizing direction protecting by flowing direction changing of same side current - Google Patents
Method for realizing direction protecting by flowing direction changing of same side current Download PDFInfo
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- CN1299412C CN1299412C CNB2005100869249A CN200510086924A CN1299412C CN 1299412 C CN1299412 C CN 1299412C CN B2005100869249 A CNB2005100869249 A CN B2005100869249A CN 200510086924 A CN200510086924 A CN 200510086924A CN 1299412 C CN1299412 C CN 1299412C
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- 238000004891 communication Methods 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims description 15
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Abstract
本发明公开了一种利用同侧电流流向变化实现方向保护的方法，包括：被保护元件两端保护装置各自对本侧电流进行采样；当电流有突变时，使用电流突变前后的采样值计算突变后电流向量相对于突变前电流向量的夹角；由计算出的角度判断两侧电流流向是否有变化；通过通讯手段将本侧电流方向变化情况告知对侧；若两侧电流方向均变化或均未变化则是被保护元件区外故障，保护装置不动作；若两侧电流方向一侧有变化而另一侧未变化则是被保护元件区内故障，保护装置动作。该方法较好地解决长期以来采用电压量和电流量判断故障方向时保护装置的不正确动作；避免了相差高频保护由于信号延时造成的保护死区；该方法对通讯通道要求低，抗干扰能力强，提高了保护装置的可靠性。
The invention discloses a method for realizing directional protection by using the change of the current flow direction on the same side, which includes: the protection devices at both ends of the protected element respectively sample the current on this side; The included angle of the current vector relative to the current vector before the mutation; judge whether the current flow direction on both sides has changed by the calculated angle; inform the opposite side of the change of the current direction on this side through communication means; if the current direction on both sides changes or neither If the change is outside the protected component area, the protection device will not operate; if the current direction on both sides changes on one side and the other side does not change, it means an internal fault on the protected component area, and the protection device will operate. This method can better solve the incorrect action of the protection device when the voltage and current are used to judge the fault direction for a long time; it avoids the protection dead zone caused by the signal delay of the phase difference high frequency protection; this method has low requirements on the communication channel and is resistant to The interference ability is strong, which improves the reliability of the protection device.
Description
Technical field
The present invention relates to field of power, relate more specifically to the relay protection of transmission line field.
Background technology
In electric power system, the frequent service orientation carrier current protection of relay protection of transmission line system, Phase Difference High Frequency Protection and fibre-optic current are differential as main protection.Its tripping (should move and not action) and malfunction (should not move and move) all can cause large-area power-cuts, and the damage power equipment does not meet the demands the quality of power supply, brings massive losses to national economy.
The direction carrier current protection is to adopt false voltage and fault current failure judgement to occur in positive direction or in the other direction, whether determines would trip according to the both sides fault direction.Because the failure judgement direction has been introduced voltage, can go wrong when voltage transformer disconnection, system oscillation, wants latch-up protection under these situations, at this moment if the consequence that breaks down is serious.
Phase Difference High Frequency Protection is to obtain the both sides current and phase difference by mutual transmission current phase information, to judge whether being troubles inside the sample space and would trip.The high-frequency signal transmission time-delay can cause the current phase error on the transmission line, and the long more error of circuit is big more, has protection dead band even can not use for the long distance power transmission line.
Optical fiber differential protective is to transmit each side current sampling data of power transmission line or current vector to calculate differential current by optical-fibre channel, constitutes the power line current differential protection.Optical differential requires high to communication channel, want synchronously at two ends, the cost height.
Summary of the invention
The objective of the invention is in order to overcome the defective in the above protection scheme, proposed a kind of same side current that utilizes and flowed to the method that changes the realization direction protection.Described method realizes by the following technical solutions, may further comprise the steps:
Protected element, separately the current waveform of this side current transformer being sampled after through the adjustment of amplitude phase place, analog-to-digital conversion as the protective device at transmission line two ends obtains current instantaneous value;
When having sudden change, electric current obtains current break front and back current sampling data;
Use the sampled value of current break front and back to calculate the angle of sudden change after-current vector with respect to current vector before suddenling change; Compare by angle that calculates and angle pre-value W, if the angle that calculates thinks then that greater than W the sense of current changes; If the angle that calculates is then thought sense of current no change less than W, after judging both sides whether current direction changing separately, the both sides protective device by means of communication with this side sense of current situation of change: the sense of current changes or does not change, and informs the offside device;
Each side protective device judges that separately all changing or all do not change as if the both sides sense of current then is the protected element external area error, and protective device is failure to actuate; Opposite side do not change if the sense of current one side in both sides changes then is the protected element troubles inside the sample space, the protective device action, and the tripping circuit breaker, the isolated fault element guarantees the electric power system reliability service;
Described predetermined value W during according to the outer fault of power system component internal fault and element before the fault current vector sum fault current vector differential seat angle determine, get 95～105 degree.
Beneficial effect of the present invention:
The present invention solves when adopting voltage and magnitude of current failure judgement direction for a long time preferably, the incorrect operation of protective device when system oscillation, voltage transformer disconnection.The protection dead band that also avoided Phase Difference High Frequency Protection because the signal lag that line length produces etc. caused.Simultaneously, have only two states because the variation of direction is a quantity of state, thus to communication channel require lowly, antijamming capability is strong, has improved the reliability of protective device.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method.
Embodiment
Fig. 1 is the schematic flow sheet of the inventive method.As shown in Figure 1, a kind of method of utilizing same side current to flow to variation realization direction protection of the present invention's proposition realizes that by the following technical solutions described method comprises step:
At first from step S101, protective device is sampled after through the adjustment of amplitude phase place, analog-to-digital conversion to the current waveform of this side current transformer and is obtained current instantaneous value, deposits the instantaneous sampling value of electric current in sampling queue.
Use the jump-value of current criterion to judge whether electric current has sudden change at step S102, electric current does not have sudden change then to be finished, if there is sudden change then to enter step S103.
Step S103 obtains the current sampling data before and after the current break from sampling queue.
Step S104 use obtain among the step S103 sampled value, calculate current break after-current vector with respect to current break before the angle of vector.
Step S105 judges that whether the angle that obtains is greater than angle predetermined value W.
If angle then is judged to current direction greater than W and changes, enter step S106 check by communication channel receive to client information, whether the opposite end angle is also greater than W, if the opposite end angle shows then that greater than W the opposite end current direction changes, the both sides current direction all changes, show it is then latch-up protection of external area error, enter step S110 and finish; If the opposite end angle is not more than W and then shows opposite end current direction no change, this side current direction changes and offside current direction no change, is troubles inside the sample space, enters step S109, protection action tripping circuit breaker.
If angle then is judged to the current direction no change less than W; enter step S107 check by communication channel receive to client information; whether the opposite end angle is also greater than W; if the opposite end angle shows then that greater than W the opposite end current direction changes; this side current direction no change and the offside current direction changes; be troubles inside the sample space, enter step S109, protection action tripping circuit breaker.If the opposite end angle is not more than W and then shows opposite end current direction no change, this side current direction no change and offside current direction be no change also, is then latch-up protection of external area error, enters step S110 and finishes.
Described definite value W generally gets 95～105 degree.
Because said method is to realize in concrete device in the present invention; for example current waveform sampled and obtain instantaneous value, judge whether electric current suddenlys change, obtain current sampling data, the calculating sudden change front and back current vector angle of sudden change front and back and judge that the variation of current direction can be realized by the various piece that has now in the protective relaying device; therefore, above-mentioned device here there is no need to further describe.The present invention only utilizes same side current to flow to change the method that realizes direction protection, can be used for the relaying protection system to critical elements such as transmission line, power cables.
According to above-mentioned description, those skilled in the art can merge or decompose each step of method of the present invention.
Claims (2)
1. one kind is utilized same side current to flow to the method that changes the realization direction protection, it is characterized in that described method may further comprise the steps:
The protective device at protected element two ends is sampled after through the adjustment of amplitude phase place, analog-to-digital conversion to the current waveform of this side current transformer separately and is obtained current instantaneous value;
When having sudden change, electric current obtains current break front and back current sampling data;
Use the sampled value of current break front and back to calculate the angle of current break after-current vector with respect to the preceding current vector of sudden change;
Compare by angle that calculates and angle pre-value W, if the angle that calculates thinks then that greater than W the sense of current changes, if the angle that calculates is then thought sense of current no change less than W, after judging both sides whether current direction changing separately, the both sides protective device is informed the offside device by means of communication with this side sense of current situation of change, and described angle pre-value W generally gets 95～105 degree;
Each side protective device judges that separately all changing or all do not change as if the both sides sense of current then is the protected element external area error, and protective device is failure to actuate; Opposite side do not change if the sense of current one side in both sides changes then is the protected element troubles inside the sample space, the protective device action, and the tripping circuit breaker, the isolated fault element guarantees the electric power system reliability service.
2. the same side current that utilizes according to claim 1 flows to the method that changes the realization direction protection; it is characterized in that, described angle predetermined value W be during according to the outer fault of power system component internal fault and element before the fault current vector sum fault current vector differential seat angle determine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100869249A CN1299412C (en) | 2005-11-18 | 2005-11-18 | Method for realizing direction protecting by flowing direction changing of same side current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100869249A CN1299412C (en) | 2005-11-18 | 2005-11-18 | Method for realizing direction protecting by flowing direction changing of same side current |
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| CN1787316A CN1787316A (en) | 2006-06-14 |
| CN1299412C true CN1299412C (en) | 2007-02-07 |
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| CNB2005100869249A Expired - Fee Related CN1299412C (en) | 2005-11-18 | 2005-11-18 | Method for realizing direction protecting by flowing direction changing of same side current |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140881B (en) * | 2007-10-25 | 2019-04-16 | Abb瑞士股份有限公司 | Differential protection method, system and device |
| CN101494374B (en) * | 2009-03-04 | 2010-09-08 | 南京因泰莱配电自动化设备有限公司 | Current protection control method for vacuum circuit breaker |
| CN101860011B (en) * | 2010-05-20 | 2012-12-26 | 北京交通大学 | Direct current rail transportation system fault recognition method |
| CN103022989B (en) * | 2011-09-28 | 2015-01-21 | 南京南瑞继保电气有限公司 | Digital current protection method for alternating-current looped serial power supply mode of subways |
| EP3405803B1 (en) * | 2016-01-20 | 2019-10-09 | ABB Schweiz AG | Fault detection of a transmission line |
| CN109378806B (en) * | 2018-11-12 | 2019-12-10 | 国网智能科技股份有限公司 | Multi-branch fault determination method and system for active power distribution network |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4420788A (en) * | 1982-07-29 | 1983-12-13 | General Electric Company | Phase relay for AC power transmission line protection |
| JPS615451A (en) * | 1984-06-19 | 1986-01-11 | Matsushita Electric Ind Co Ltd | Information recording carrier |
| US6373670B1 (en) * | 1998-09-17 | 2002-04-16 | Alstom Uk Limited | Fault protection apparatus |
-
2005
- 2005-11-18 CN CNB2005100869249A patent/CN1299412C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4420788A (en) * | 1982-07-29 | 1983-12-13 | General Electric Company | Phase relay for AC power transmission line protection |
| JPS615451A (en) * | 1984-06-19 | 1986-01-11 | Matsushita Electric Ind Co Ltd | Information recording carrier |
| US6373670B1 (en) * | 1998-09-17 | 2002-04-16 | Alstom Uk Limited | Fault protection apparatus |
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| CN1787316A (en) | 2006-06-14 |
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