CN105140891A - Adaptive method of busbar differential protection under running and switching - Google Patents
Adaptive method of busbar differential protection under running and switching Download PDFInfo
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- CN105140891A CN105140891A CN201510458159.2A CN201510458159A CN105140891A CN 105140891 A CN105140891 A CN 105140891A CN 201510458159 A CN201510458159 A CN 201510458159A CN 105140891 A CN105140891 A CN 105140891A
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Abstract
The invention discloses an adaptive method of busbar differential protection under running and switching operation conditions. A starting element and an acting element are switched in an adaptive manner; a proportional brake coefficient is adjusted in the adaptive manner; the adaptive method particularly comprises the steps as follows: under a normal running condition, a large differential element is taken as a starting element; a small differential element is taken as the acting element; and a relatively small value is adopted by a large differential element proportional brake coefficient to expand an action region and reduce a brake region; under a switching operation condition, the small differential element is quitted; the large different element is converted into the acting element from the starting element; and a relatively large value is adopted by a large different element ratio to reduce the action region and the expand the brake region. According to the adaptive method, the sensitivity of an existing busbar differential protection action is improved under the normal running condition; and the reliability of the existing busbar differential protection action is improved under the switching operation condition.
Description
Technical field
The present invention relates to field of power, relate more specifically to relay protection of power system bus differential protecting and to run and under grid switching operation operating mode, self adaptation differentiates normal, can the scheme of sensitive and action message.
Background technology
Bus protection has very important status in field of relay protection in power, and the correct operation behavior of bus protection can ensure the power supply of important load, significantly reduces user's loss.
Existing bus differential protecting adopts fixed proportion braking curve division operation district and braking district, to reduce the sensitivity of protection act when having and draining out electric current as there is bus troubles inside the sample space; Existing bus differential protecting is fixed will be poor greatly (i.e. the whole bus differential circuit that all branch currents are formed except mother/segmentation branch road) as starting component; fix little difference (all branch roads namely certain section of bus connected comprise the differential circuit that mother/segmentation branch current is formed), as action element, is had higher false protection probability when grid switching operation.
Summary of the invention
In order to solve the problems referred to above existed in existing bus differential protection, the present invention proposes a kind of solution differentiated in normal operation and grid switching operation operating mode Down Highway differential protection self adaptation, ensureing that bus differential protecting can sensitive and action message.
The present invention is concrete by the following technical solutions.
A kind of bus differential protecting adaptive approach under operation and back brake, is characterized in that: described method self adaptation switches and starts and action element, self-adaptative adjustment proportional brake coefficient.
A kind of bus differential protecting adaptive approach under operation and back brake, it is characterized in that, described method comprises following content:
(1) under bus accidental conditions:
1.1 large poor elements are as starting component, and little poor element is as action element;
1.2 large poor element proportional brake coefficients adopt the first proportional brake coefficient;
(2) under bus carries out grid switching operation operating mode:
2.1 exit little poor element, and large poor element changes action element into from starting component;
2.2 large poor element proportional brake coefficients adopt the second proportional brake coefficient;
Wherein, the first proportional brake coefficient is less than the second proportional brake coefficient.
The magnitude relationship of the second proportional brake coefficient k2 and the first proportional brake coefficient k1 is:
k2≥(1.2～1.5)*k1≥0.3。
The present invention has following useful technique effect:
Under accidental conditions, improve the sensitivity of existing bus differential protecting action, under grid switching operation operating mode, improve the reliability of existing protection bus differential protecting action.
Accompanying drawing explanation
Fig. 1 is normal operation and large poor element rate restraint curve under grid switching operation operating mode, and wherein k1 is proportional brake coefficient first proportional brake coefficient during normal operation, proportional brake coefficient second proportional brake coefficient when k2 is grid switching operation.
Embodiment
Below in conjunction with accompanying drawing 1, solution of the present invention is described in further detail.
Existing bus differential protecting is based on Kirchhoff's current law (KCL).In theory, when calculating differential current or stalling current, all inflows or the current branch flowing out this bus section, busbar section should only be counted into once, should not repeat to count.But when this section of bus occurs draining out electric current, drain out electric current and can repeat contribution to stalling current, make differential rate restraint curve closer to braking side, district.If there is bus troubles inside the sample space, more easily enter braking district, poorly greatly not easily to start, cause differential protection may tripping.Whether existing bus differential protecting None-identified exists drains out electric current, therefore for evading this problem that existing bus differential protecting exists, proposes the solution of self-adaptative adjustment rate restraint curve.Whether under accidental conditions, no matter exist in bus bar circuit and drain out electric current, large poor element proportional brake coefficient, expands active region, reduce braking district if adopting smaller value, improve the sensitivity that large poor element starts, do not affect the correctness of differential protection action.
Existing bus differential protecting fixes the element characteristic of poor greatly and little difference, and large poor fixing as starting component, little difference is fixing as action element.Under grid switching operation operating mode; the electric current that disconnecting link twin spans causes back brake branch road CT to recognize is the algebraical sum that this branch road flows into the electric current of two sections of buses of disconnecting link twin spans; bus differential protecting accurately cannot know inflow two sections of buses size of current separately respectively; when now there is bus troubles inside the sample space; the little poor element mistake in computation of fault bus and non-faulting bus, little poor element cannot selecting properly fault bus.For addressing this problem, propose under grid switching operation operating mode, exit little poor action element, element characteristic poor is greatly adjusted to action element from starting component adaptively, large poor element malfunction time simultaneously for preventing bus external area error, and large poor element proportional brake coefficient adopts higher value.
The present invention relates to the action discrimination of relay protection of power system median generatrix differential protection, more precisely: under normal operation and grid switching operation operating mode, self-adaptative adjustment rate restraint curve, defines different active regions and braking district; Under normal operation and grid switching operation operating mode, self adaptation switches and starts and action element, the large difference of adaptively changing and the effect of little difference in differential protection.Accompanying drawing 1 is the large poor element proportional brake coefficient curve of bus protection, proportional brake coefficient when wherein k1 is normal operation, proportional brake coefficient when k2 is grid switching operation, k2>k1.
A kind of bus differential protecting disclosed in the present application is adaptive approach under operation and back brake, comprises following content:
1, under bus accidental conditions:
1) poor as starting component greatly, little difference is as action element; 2) large poor element proportional brake coefficient k1 adopts smaller value, expands active region scope, reduces braking district scope.
Under accidental conditions, if there is bus troubles inside the sample space, differential current and stalling current fall into the active region of large poor rate restraint curve, and namely large poor element starts, and differential current and stalling current drop point fall into the active region of little poor rate restraint curve, i.e. little poor element movement.Bus differential protecting according to action little poor localizing faults place bus, the branch road only on tripping fault bus, isolated fault, and ensure that the branch road on non-faulting bus normally runs.
When existence in loop drains out electric current; contribution is repeated to the calculating of the stalling current in large poor element; increase stalling current, braking characteristic strengthens, and poor being greatly not easy starts; differential protection is not easy action; therefore need self-adaptative adjustment, expand active region poor greatly, improve sensitivity poor greatly; reduce to drain out electric current to impact poor greatly, also can reliably start even if existence drains out the large difference of electric current.Drain out electric current to have nothing to do with the little differential current of poor element and the calculating of stalling current, therefore do not adjust active region and the braking district scope of the rate restraint curve of little poor element.
2, under bus carries out grid switching operation operating mode:
1) exit little poor element, poorly greatly change action element into from starting component; 2) large poor element proportional brake coefficient adopts higher value k2, reduces active region scope, expands braking district scope.
Only under grid switching operation operating mode, little difference by disconnecting link twin spans reason, causes back brake branch current to count little poor differential current or the stalling current double counting of corresponding section bus, if now there is bus troubles inside the sample space, will occur littlely differentially making incorrect situation.Therefore, under grid switching operation operating mode, exit little poor element, avoid false protection.Now, poor greatly still effective, change action element by poor greatly into from starting component, and large poor element proportional brake coefficient adopts higher value, differential current and stalling current fall into the active region of large poor rate restraint curve, all buses of bus differential protecting action tripping.
According to drain out during bus troubles inside the sample space electric current account for 50% bus differential protecting still can correct operation, and when considering external area error, bus differential protecting reliably escapes unsymmetrical current, then k1 >=0.3.
According to k2 to having certain safety factor to consider, getting safety factor is 1.2 ~ 1.5, then the magnitude relationship of the first proportional brake coefficient k1 and the second proportional brake coefficient k2 can be described as:
k2≥(1.2～1.5)*k1≥0.3。
Applicant has done detailed description and description in conjunction with Figure of description to embodiments of the invention; but those skilled in the art should understand that; above embodiment is only the preferred embodiments of the invention; detailed explanation is just in order to help reader to understand spirit of the present invention better; and be not limiting the scope of the invention; on the contrary, any any improvement of doing based on invention of the present invention spirit or modify all should drop within protection scope of the present invention.
Claims (3)
1. bus differential protecting adaptive approach under operation and back brake, is characterized in that: described method self adaptation switches and starts and action element, self-adaptative adjustment proportional brake coefficient.
2. bus differential protecting adaptive approach under operation and back brake, it is characterized in that, described method comprises following content:
(1) under bus accidental conditions:
1.1 large poor elements are as starting component, and little poor element is as action element;
1.2 large poor element proportional brake coefficients adopt the first proportional brake coefficient;
(2) under bus carries out grid switching operation operating mode:
2.1 exit little poor element, and large poor element changes action element into from starting component;
2.2 large poor element proportional brake coefficients adopt the second proportional brake coefficient;
Wherein, the first proportional brake coefficient is less than the second proportional brake coefficient.
3. adaptive approach according to claim 2, is characterized in that:
The magnitude relationship of the second proportional brake coefficient k2 and the first proportional brake coefficient k1 is:
k2≥(1.2～1.5)*k1≥0.3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510458159.2A CN105140891A (en) | 2015-07-30 | 2015-07-30 | Adaptive method of busbar differential protection under running and switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510458159.2A CN105140891A (en) | 2015-07-30 | 2015-07-30 | Adaptive method of busbar differential protection under running and switching |
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| CN105140891A true CN105140891A (en) | 2015-12-09 |
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| CN201510458159.2A Pending CN105140891A (en) | 2015-07-30 | 2015-07-30 | Adaptive method of busbar differential protection under running and switching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675827A (en) * | 2021-07-26 | 2021-11-19 | 北京四方继保工程技术有限公司 | Multi-region bus differential protection method irrelevant to main wiring mode |
Citations (3)
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| CN1725591A (en) * | 2005-07-20 | 2006-01-25 | 北京四方继保自动化股份有限公司 | Adaptive regulation method of bus protection ratio brake coefficient based on bus connection current |
| CN101609979A (en) * | 2009-07-24 | 2009-12-23 | 南京南瑞继保电气有限公司 | OO bus protection setting method |
| CN102074936A (en) * | 2010-12-15 | 2011-05-25 | 国网电力科学研究院 | Method based on fault transient process for coordinating operating characteristics of differential relay |
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2015
- 2015-07-30 CN CN201510458159.2A patent/CN105140891A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1725591A (en) * | 2005-07-20 | 2006-01-25 | 北京四方继保自动化股份有限公司 | Adaptive regulation method of bus protection ratio brake coefficient based on bus connection current |
| CN101609979A (en) * | 2009-07-24 | 2009-12-23 | 南京南瑞继保电气有限公司 | OO bus protection setting method |
| CN102074936A (en) * | 2010-12-15 | 2011-05-25 | 国网电力科学研究院 | Method based on fault transient process for coordinating operating characteristics of differential relay |
Non-Patent Citations (2)
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| 姚李孝等: ""高性能微机式母线保护装置研制"", 《电网技术》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675827A (en) * | 2021-07-26 | 2021-11-19 | 北京四方继保工程技术有限公司 | Multi-region bus differential protection method irrelevant to main wiring mode |
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Application publication date: 20151209 |