CN102820640B - Method for blocking elements in zero-sequence direction for double-circuit lines on same tower - Google Patents
Method for blocking elements in zero-sequence direction for double-circuit lines on same tower Download PDFInfo
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- CN102820640B CN102820640B CN201210259466.4A CN201210259466A CN102820640B CN 102820640 B CN102820640 B CN 102820640B CN 201210259466 A CN201210259466 A CN 201210259466A CN 102820640 B CN102820640 B CN 102820640B
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Abstract
The invention discloses a method for blocking elements in a zero-sequence direction for double-circuit lines on the same tower. According to the method, a protection device in a longitudinal direction samples a current waveform of a current transformer of the double-circuit lines on the same tower and extracts a zero-sequence current component and a positive-sequence current component; and when the protection of the protection device in the longitudinal direction is started, the protection device in the longitudinal direction judges if a ratio of the zero-sequence current component to the positive-sequence current component is less than 15% of a starting threshold, if so, the fault type is judged as an inter-phase ungrounded fault and the elements in the zero-sequence direction are blocked, if not, the fault type is judged as a grounded fault, and the elements in the zero-sequence direction are put into protection judgment. The method disclosed by the invention can correctly distinguish the grounded fault and the inter-phase ungrounded fault of the double-circuit lines on the same tower and prevent the elements in the zero-sequence direction from being wrongly started for the inter-phase ungrounded fault so as to further prevent missed protection or wrong protection.
Description
Technical field
The present invention relates to the pilot direction resist technology field on common-tower double-return line, be specifically related to a kind of method of the zero-sequence direction component locking for common-tower double-return line.
Background technology
Pilot direction protection main protection consists of range direction element and zero-sequence direction component.Zero-sequence direction component comprises zero sequence positive direction element and zero sequence element in the other direction.After protection starts, if protection place residual voltage and zero-sequence current all reach zero-sequence direction component, start threshold value, zero-sequence direction component starts, and participates in fault direction and differentiates.If the arbitrary startup threshold value that do not reach of residual voltage and zero-sequence current, zero-sequence direction component will not start, only by range direction element Judging fault direction.In extra high voltage network, this Microcomputer Protection is widely used, reliable in action, zero-sequence direction component does not start when alternate phase to phase fault, but can be preferably as range direction element supplementing in sensitivity when the high resistance earthing fault.
In common even transposition circuit, during earth fault, zero sequence feature is obvious, does not have zero sequence feature during phase to phase fault, and both exist greatest differences, and zero-sequence direction component only starts and differentiates when earth fault.Yet for part short distance common-tower double-return line, the form that usually adopts each phase conductor not replace is set up.Each phase parameter of common-tower double-return line is asymmetric, just has zero-sequence current and residual voltage while causing normally moving in circuit.When there is alternate phase to phase fault, be subject to the impact of asymmetry parameter, in circuit, also there is zero-sequence current and residual voltage.Now, zero-sequence direction component may start threshold value error starting because residual voltage and zero-sequence current all reach, cannot correct decision fault direction, finally cause protection tripping or malfunction.According to engineering practical operating experiences and relevant report, record, occurred pilot direction protection tripping that a lot of common-tower double-return lines cause because of zero-sequence direction component error starting or the case of malfunction.
Summary of the invention
For solving above-mentioned problems of the prior art; the object of the present invention is to provide a kind of method of the zero-sequence direction component locking for common-tower double-return line; can correctly distinguish earth fault and alternate phase to phase fault that common-tower double-return line occurs; avoid zero-sequence direction component error starting when alternate phase to phase fault, thereby cause protecting tripping or malfunction.
For achieving the above object, the technical solution adopted in the present invention is:
A method for the zero-sequence direction component locking of common-tower double-return line, comprises the following steps:
Step 1: pilot direction protective device is sampled to the current waveform of common-tower double-return line current instrument transformer, and extract zero-sequence current component and forward-order current component;
Step 2: when the protection of pilot direction protective device starts, whether the ratio that differentiation zero-sequence current component accounts for forward-order current component is less than startup threshold value;
Step 3: when the ratio that accounts for forward-order current component when zero-sequence current component is less than and starts threshold value, fault type is differentiated for alternate phase to phase fault, zero-sequence direction component locking, otherwise be earth fault, zero-sequence direction component drops into protection differentiation.
Described startup threshold value is set as 15%.
The inventive method need to be extracted zero-sequence current and forward-order current size simultaneously, adds the barring condition of zero-sequence direction component in pilot direction protection, makes it when alternate phase to phase fault, not drop into differentiation.For the common-tower double-return line of both-end common bus, no matter alternate phase to phase fault outside Nei Huo district, generating region can, correctly by zero-sequence direction component locking, effectively improve the Reliability of Microprocessor of pilot direction protection application when common-tower double-return line.
Accompanying drawing explanation
Fig. 1 is the flow chart of realizing the inventive method.
Fig. 2 is applicable to a kind of conspectus of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the method for a kind of zero-sequence direction component locking for common-tower double-return line of the present invention, comprises the following steps:
Step 1: pilot direction protective device is sampled to the current waveform of common-tower double-return line current instrument transformer, and extract zero-sequence current component and forward-order current component size, be designated as respectively I
0and I
1;
Step 2: when the protection of pilot direction protective device starts, whether the ratio that differentiation zero-sequence current component accounts for forward-order current component is less than startup threshold value, i.e. I
0i
1<15%;
Step 3: when the ratio that accounts for forward-order current component when zero-sequence current component is less than and starts threshold value, fault type is differentiated for alternate phase to phase fault, zero-sequence direction component locking, otherwise be earth fault, zero-sequence direction component drops into protection differentiation.
Embodiment
As shown in Figure 2, MN is the common-tower double-return line of both-end common bus, and double loop M, N two ends are all equiped with protective device, have zero-sequence direction component in protective device.The protection of the I loop line M of take below end is example explanation the solution of the present invention.
I loop line M end protective device gathers I loop line electric current in current transformer, and extracts respectively the zero-sequence current of I loop line electric current and the size of forward-order current.After whole group of protective device starts, calculate the ratio that zero-sequence current accounts for forward-order current, when the ratio that accounts for forward-order current when zero-sequence current is less than 15% startup threshold value, by zero-sequence direction component locking, otherwise zero-sequence direction component is open, then carry out fault distinguishing.
Adopt the zero-sequence direction component locking scheme of above-mentioned zero-sequence current and forward-order current comparison; common-tower double-return line for both-end common bus; no matter alternate phase to phase fault outside Nei Huo district, generating region; can, correctly by zero-sequence direction component locking, effectively improve the Reliability of Microprocessor of pilot direction protection application when common-tower double-return line.
Claims (2)
1. for a method for the zero-sequence direction component locking of common-tower double-return line, it is characterized in that: comprise the following steps:
Step 1: pilot direction protective device is sampled to the current waveform of common-tower double-return line current instrument transformer, and extract zero-sequence current component and forward-order current component;
Step 2: when the protection of pilot direction protective device starts, whether the ratio that differentiation zero-sequence current component accounts for forward-order current component is less than startup threshold value;
Step 3: when the ratio that accounts for forward-order current component when zero-sequence current component is less than and starts threshold value, fault type is differentiated for alternate phase to phase fault, zero-sequence direction component locking, otherwise be earth fault, zero-sequence direction component drops into protection differentiation.
2. the method for the zero-sequence direction component locking for common-tower double-return line according to claim 1, is characterized in that: described startup threshold value is set as 15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210259466.4A CN102820640B (en) | 2012-07-25 | 2012-07-25 | Method for blocking elements in zero-sequence direction for double-circuit lines on same tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210259466.4A CN102820640B (en) | 2012-07-25 | 2012-07-25 | Method for blocking elements in zero-sequence direction for double-circuit lines on same tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102820640A CN102820640A (en) | 2012-12-12 |
| CN102820640B true CN102820640B (en) | 2014-11-05 |
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| CN201210259466.4A Expired - Fee Related CN102820640B (en) | 2012-07-25 | 2012-07-25 | Method for blocking elements in zero-sequence direction for double-circuit lines on same tower |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595032B (en) * | 2013-11-21 | 2018-01-23 | 国家电网公司 | Method for the zero-sequence direction component locking for the multiple-circuit on same tower that do not replace |
| CN104578008B (en) * | 2015-01-12 | 2017-10-20 | 西安交通大学 | A kind of zero-sequence direction component faulty action preventing method |
| CN106291046B (en) * | 2016-07-28 | 2019-11-12 | 华北电力大学 | Mixed pressure common-tower double-return line is single-phase across single-phase across voltage failure current calculation method |
| CN107979067B (en) * | 2017-10-20 | 2022-07-08 | 中国电力科学研究院有限公司 | Zero sequence current protection method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558512A (en) * | 2004-02-13 | 2004-12-29 | 浙江大学 | Integrated differential flow method for preventing voltage transformer differential protection unwanted operation |
| CN101847863A (en) * | 2009-03-27 | 2010-09-29 | 湖北省电力试验研究院 | Relay protection method for double-circuit transmission lines on same tower |
| CN102427223A (en) * | 2011-10-21 | 2012-04-25 | 浙江省电力公司 | Method for judging lock by zero sequence voltage and current |
| CN102570423A (en) * | 2012-01-19 | 2012-07-11 | 天津大学 | Crossover line permanent fault recognizing method for double circuit lines on same tower |
-
2012
- 2012-07-25 CN CN201210259466.4A patent/CN102820640B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558512A (en) * | 2004-02-13 | 2004-12-29 | 浙江大学 | Integrated differential flow method for preventing voltage transformer differential protection unwanted operation |
| CN101847863A (en) * | 2009-03-27 | 2010-09-29 | 湖北省电力试验研究院 | Relay protection method for double-circuit transmission lines on same tower |
| CN102427223A (en) * | 2011-10-21 | 2012-04-25 | 浙江省电力公司 | Method for judging lock by zero sequence voltage and current |
| CN102570423A (en) * | 2012-01-19 | 2012-07-11 | 天津大学 | Crossover line permanent fault recognizing method for double circuit lines on same tower |
Non-Patent Citations (2)
| Title |
|---|
| 同杆双回线环流对方向纵联保护的影响及改进;李斌等;《电力系统自动化》;20110425;第35卷(第8期);全文 * |
| 李斌等.同杆双回线环流对方向纵联保护的影响及改进.《电力系统自动化》.2011,第35卷(第8期),全文. * |
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| CN102820640A (en) | 2012-12-12 |
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