CN103762573A - Self-adaptive zero-sequence current protecting method for electric transmission line - Google Patents
Self-adaptive zero-sequence current protecting method for electric transmission line Download PDFInfo
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- CN103762573A CN103762573A CN201410053972.7A CN201410053972A CN103762573A CN 103762573 A CN103762573 A CN 103762573A CN 201410053972 A CN201410053972 A CN 201410053972A CN 103762573 A CN103762573 A CN 103762573A
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Abstract
The invention discloses a self-adaptive zero-sequence current protecting method for an electric transmission line. A zero-sequence accelerating factor is calculated by using the three-phase current and a set current constant of a protecting and installing position of the electric transmission line; then the actuation time is calculated, after actuation time delay is obtained through calculation, a protecting device sends an actuation tripping signal, and therefore breakers at the two ends of the electric transmission line trip off. The closer a fault point is to the protecting and installing position of the electric transmission line, or the smaller transition resistance is, the smaller the zero-sequence accelerating factor, the shorter the actuation time are, and the shorter the actuation time delay time of the protecting device is, so that the protecting device actuates tripping-off within very short time and isolates a faulty line from a power grid, and then safe and reliable operation of the power grid is ensured.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, be specifically related to a kind of transmission line Adaptive Zero-sequence Current Protection method.
Background technology
If transmission line generation metallic earthing short circuit and ground short circuit fault point are near line protection installation place; fault current is very large; the major break down electric current long period is flow through each electric equipment of transformer station; can, because thermally-stabilised destroyed and cause electric equipment in transformer station to burn or insulation breakdown, cause Substation Electric Equipment fault again.Therefore, need transmission line current protection energy fast reaction failure condition, faulty line and electrical network are kept apart in action tripping operation in time, to guarantee power network safety operation.
Yet, tradition transmission line current protection method is whether first failure judgement electric current is greater than current setting, if fault current is greater than current setting, protective device sends action trip signal after the set time time delay through adjusting again, no matter failure point of power transmission line is far and near, seriously whether fault degree, tradition transmission line current protection method all cannot be done the time by automatic regulation moving, to reduce fault current, flow through the time of Substation Electric Equipment, during transmission line malfunction, again break down and buried hidden danger also just to Substation Electric Equipment, cannot effectively prevent that fault from not expanding, thereby bring huge potential safety hazard to power network safety operation.
Summary of the invention
The invention provides a kind of transmission line Adaptive Zero-sequence Current Protection method, it has overcome the deficiencies in the prior art described in background technology.
The technical scheme adopting that the present invention solves its technical problem is:
Transmission line Adaptive Zero-sequence Current Protection method, is characterized in that, comprises following sequential steps:
Step 1, the A phase current of protector measuring line protection installation place
b phase current
with C phase current
Step 2, protective device calculates zero sequence accelerated factor
wherein: k is tuning coefficient, k gets any number in [0.01,0.1] scope, I
pfor the current constant of adjusting;
Step 3, protective device calculates operate time
, and through operate time
time delay send action trip signal, with the circuit breaker at tripping transmission line two ends, wherein: t
pfor the time constant of adjusting, I
pfor the current constant of adjusting.
The technical program is compared with background technology, and its tool has the following advantages:
The current constant calculating zero sequence accelerated factor that first the present invention utilizes the three-phase current of line protection installation place and adjust; then calculate operate time; after time delay operate time that protective device calculates, send action trip signal, the circuit breaker at tripping transmission line two ends.Fault point is less the closer to line protection installation place or transition resistance; zero sequence accelerated factor and operate time are less; protective device action tripping operation delay time is also shorter; make protective device can in the short time, move at the utmost point tripping operation; in time faulty line and electrical network are kept apart, thereby guarantee power network safety operation.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 has illustrated application circuit transmission system schematic diagram of the present invention.。
Embodiment
Please refer to Fig. 1, in Fig. 1, CT is current transformer.Protective device 1 obtains the current waveform of line protection installation place by current transformer 2; and the current waveform of current transformer 2 acquisitions is sampled and obtained current instantaneous value; then, the current instantaneous value that protective device 1 collects it utilizes the A phase current of Fourier algorithm computing electric power line protection installation place
b phase current
with C phase current
And then protective device 1 calculates zero sequence accelerated factor
wherein: k is tuning coefficient, k gets any number in [0.01,0.1] scope, I
pfor the current constant of adjusting;
Finally, protective device 1 calculates operate time
and through operate time
time delay send action trip signal, with the circuit breaker at tripping transmission line two ends, wherein: t
pfor the time constant of adjusting, I
pfor the current constant of adjusting.
The current constant calculating zero sequence accelerated factor that first the present invention utilizes the three-phase current of line protection installation place and adjust; then calculate operate time; after time delay operate time that protective device calculates, send action trip signal, the circuit breaker at tripping transmission line two ends.Fault point is less the closer to line protection installation place or transition resistance, and (transition resistance that is short circuit place is less; as while there is metallic earthing short circuit); zero sequence accelerated factor and operate time are less; protective device action tripping operation delay time is also shorter; make protective device can in the short time, move at the utmost point tripping operation; in time faulty line and electrical network are kept apart, thereby guarantee power network safety operation.
The above, only for preferred embodiment of the present invention, therefore can not limit according to this scope of the invention process, the equivalence of doing according to the scope of the claims of the present invention and description changes and modifies, and all should still belong in the scope that the present invention contains.
Claims (1)
1. transmission line Adaptive Zero-sequence Current Protection method, is characterized in that, comprises following sequential steps:
Step 1, the A phase current of protector measuring line protection installation place
b phase current
with C phase current
Step 2, protective device calculates zero sequence accelerated factor
wherein: k is tuning coefficient, k gets any number in [0.01,0.1] scope, I
pfor the current constant of adjusting;
Step 3, protective device calculates operate time
and through operate time
time delay send action trip signal, with the circuit breaker at tripping transmission line two ends, wherein: t
pfor the time constant of adjusting, I
pfor the current constant of adjusting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053972.7A CN103762573A (en) | 2014-02-18 | 2014-02-18 | Self-adaptive zero-sequence current protecting method for electric transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053972.7A CN103762573A (en) | 2014-02-18 | 2014-02-18 | Self-adaptive zero-sequence current protecting method for electric transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103762573A true CN103762573A (en) | 2014-04-30 |
Family
ID=50529763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410053972.7A Pending CN103762573A (en) | 2014-02-18 | 2014-02-18 | Self-adaptive zero-sequence current protecting method for electric transmission line |
Country Status (1)
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| CN (1) | CN103762573A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703338A (en) * | 2016-03-29 | 2016-06-22 | 国网福建省电力有限公司 | Phase current protection method for power transmission line |
| CN106451380A (en) * | 2016-11-09 | 2017-02-22 | 山东大学 | Same-tower double-circuit-line inside oriented zero sequence inverse time limit overcurrent protection sequent action method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3372054B2 (en) * | 1992-07-06 | 2003-01-27 | 株式会社東芝 | High-speed reclosable grounding device |
| CN103368153A (en) * | 2013-06-18 | 2013-10-23 | 国家电网公司 | Accelerated factor-based power transmission line negative sequence current protective method |
-
2014
- 2014-02-18 CN CN201410053972.7A patent/CN103762573A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3372054B2 (en) * | 1992-07-06 | 2003-01-27 | 株式会社東芝 | High-speed reclosable grounding device |
| CN103368153A (en) * | 2013-06-18 | 2013-10-23 | 国家电网公司 | Accelerated factor-based power transmission line negative sequence current protective method |
Non-Patent Citations (1)
| Title |
|---|
| 吴麟琳: "平行双回线对反时限零序电流保护的影响及改进算法", 《电网技术》, vol. 37, no. 3, 31 March 2013 (2013-03-31), pages 707 - 712 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703338A (en) * | 2016-03-29 | 2016-06-22 | 国网福建省电力有限公司 | Phase current protection method for power transmission line |
| CN106451380A (en) * | 2016-11-09 | 2017-02-22 | 山东大学 | Same-tower double-circuit-line inside oriented zero sequence inverse time limit overcurrent protection sequent action method |
| CN106451380B (en) * | 2016-11-09 | 2019-02-12 | 山东大学 | Towards the zero sequence inverse-time overcurrent protection successive relay trip method inside double-circuit line on same pole |
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Application publication date: 20140430 |