CN106655115B - Differential protection method of discrimination based on combined sequence components - Google Patents
Differential protection method of discrimination based on combined sequence components Download PDFInfo
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- CN106655115B CN106655115B CN201510729243.3A CN201510729243A CN106655115B CN 106655115 B CN106655115 B CN 106655115B CN 201510729243 A CN201510729243 A CN 201510729243A CN 106655115 B CN106655115 B CN 106655115B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 4
- 239000011800 void material Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000009699 differential effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of differential protection method of discrimination based on combined sequence components, combined sequence components differential protection consist of three parts, respectively forward-order current difference element, negative-sequence current difference element, differential current element；Forward-order current difference element is used to identify three-phase fault, and negative-sequence current difference element is used to identify that unbalanced fault, phase current differential element are used to identify that failure is separate；The movement of forward-order current difference element and the movement of three-phase current difference element, then be judged to three-phase fault；The movement of negative-sequence current difference element and single-phase or two-phase differential current element movement, then be judged to unbalanced fault in area, including single-phase or phase to phase fault.The present invention can rapidly and accurately identify fault section after breaking down in regional power grid, can substantially reduce the light mutual inductor number of use, save project cost；It is not influenced by load side zero-sequence component, external area error is reliably motionless, troubles inside the sample space action message.
Description
Technical field
The method more particularly to base of Division identification fault zone when breaking down the present invention relates to multistage statements based on collusion cable run
In the differential protection method of discrimination of combined sequence components.
Background technique
Big and medium-sized cities multistage acts in collusion to make each other's confessions cable run using more and more extensive, and statements based on collusion cable protection is generally with distance or overcurrent
Based on protection, statements based on collusion cable generally connects multiple loads, and due to the particularity for cable of acting in collusion to make each other's confessions, protection cooperation is complicated, cable protection
Actuation time, the differential power supply reliability that is unable to satisfy required, and cable fault position is difficult to confirm, in order to improve power supply reliability, mention
High fast recovery of power supply ability is set in the case where not influencing equipment operation in every grade of branch's load point (transformer installation place)
One group of light Flexible transformer is set, the split-phase electric current of measurement is transmitted to by concentration discriminating gear by data acquisition unit, concentrates and differentiates
Device is based on differential current and protects comprehensive descision fault zone, as shown in Figure 1, with this solution, it can be by fault section
It accurately and reliably determines and.But a large amount of light mutual inductor and combining unit are needed based on the program, lead to above-mentioned this solution
Scheme cost is very high, and system topology complex；If reduce mutual inductor configuration, be configured to as shown in Fig. 2, if by
In load transformer neutral ground, external area error can generate biggish zero-sequence current, cause differential current protection may
Malfunction.
In order to reduce cost, but differential protection action performance is not reduced, guarantee the sensitivity that fault zone differentiates, become
The problem of urgent need to resolve at present proposes corresponding solution based on this herein.
Summary of the invention
The purpose of the present invention is to provide a kind of differential protection method of discrimination based on combined sequence components, based on synthesis
When the differential protection method of discrimination of order components breaks down for solving multistage statements based on collusion cable run, identification faulty section cannot be distinguished
The problem of domain, and do not influenced by multistage statements based on collusion lines branch load.
Research uses comprehensive differential protection element herein, by forward-order current difference element, negative-sequence current difference element with
And differential current element composition, forward-order current difference element considers three-phase fault, and negative-sequence current difference element considers not
Symmetric fault, phase current differential element are used for failure phase phase selection, the movement of forward-order current difference element and three-phase phase current differential member
Part movement is judged to three-phase fault in area, the movement of negative-sequence current difference element and single-phase or two-phase phase current differential element movement,
Then it is judged to unbalanced fault.Comprehensive differential protection element can guarantee in area there are in the case where load branch, and troubles inside the sample space occurs
When difference element action message, occur external area error when difference element it is reliably motionless.
The technical scheme is that the differential protection method of discrimination based on combined sequence components, feature includes following step
It is rapid: line fault is differentiated using Sequence Differential element and Negative Sequence Differential element, it is separate using phase current differential element identification failure,
After Sequence Differential element or Negative Sequence Differential element movement, it is just judged to troubles inside the sample space, in conjunction with mutually differential action element,
Issue corresponding failure phase action signal.
Sequence Differential element only reflects three-phase fault, is respectively formed positive sequence by forward-order current of this side after synchronous with opposite side
Difference current and positive sequence stalling current constitute Sequence Differential element.
Negative Sequence Differential element only reflects unbalanced fault, is respectively formed by negative-sequence current of this side after synchronous with opposite side negative
Sequence difference current and negative dynamic stalling current, constitute Negative Sequence Differential element.
And if only if Sequence Differential element or Negative Sequence Differential element movement, and without block signal in area, just it is judged in area
Failure, three-phase phase current differential element act, and Sequence Differential element is just effective, and single-phase or two-phase phase current differential element is dynamic
After work, Negative Sequence Differential current element is just effective.
Sequence Differential element movement definite value must escape maximum load current, after Sequence Differential element movement, necessarily have
Failure occurs, and in conjunction with the protection signals such as transformer or feeder line movement, fault section can be accurately positioned.
It then must be this section line fault when Sequence Differential or Negative Sequence Differential element movement, and without block signal in area,
Block signal generally connects other protection signals in area, is latched this segment difference and moves action element.
For dual power supply or multiple feed route, each side split-phase electric current of each fault section, base are successively calculated by route
In positive sequence and Negative Sequence Differential current element, identify whether as troubles inside the sample space.
It is an advantage of the invention that fault section can be rapidly and accurately identified after breaking down in regional power grid, it can
The light mutual inductor number of use is substantially reduced, project cost is saved.Program algorithm is simple, not by load side zero-sequence component shadow
It rings, external area error is reliably motionless, troubles inside the sample space action message.
Detailed description of the invention
Fig. 1 is former scheme overall plan wiring schematic diagram；
Fig. 2 is the present invention program wiring schematic diagram；
Fig. 3 is logical scheme of the present invention；
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention and beneficial effect are described in detail.
Referring to figure 1, figure 2 and figure 3, based on the differential protection method of discrimination of combined sequence components the following steps are included:
Troubles inside the sample space is differentiated using forward-order current difference element and negative-sequence current difference element, using differential current member
Part identifies that failure is separate；
When Sequence Differential Current element movement and differential phase selection result is three-phase fault, and is latched and believes without troubles inside the sample space
Number, then it is judged to three-phase fault in area；
When the movement of Negative Sequence Differential current element and phase selection result is single-phase or phase to phase fault, and is latched without troubles inside the sample space
Signal is then judged to unbalanced fault in area.
Preferably, Sequence Differential element is for reflecting three-phase fault；By positive sequence electricity of this side after synchronous with opposite side
Stream forms Sequence Differential Current and positive sequence stalling current, constitutes Sequence Differential element.Negative Sequence Differential element is for reflecting asymmetry
Failure；Negative Sequence Differential electric current and negative sequence braking electric current are formed by negative-sequence current of this side after synchronous with opposite side, constitute Negative Sequence Differential
Element.Three-phase difference stream phase selection element acts and Sequence Differential element movement, is judged to three-phase fault in area；Single-phase or two-phase
Phase current differential element movement and the movement of Negative Sequence Differential current element, are judged to single-phase in area or phase to phase fault.Sequence Differential member
After part or Negative Sequence Differential element movement, it is failure to actuate and if only if troubles inside the sample space block signal, is just judged to troubles inside the sample space；If area
Internal fault block signal acts, then Sequence Differential Current element or Negative Sequence Differential current element exercise void.
When breaking down in power grid, according to the fault current feature of each measuring point, quick and precisely identifies fault section, add
The ability that fast post-fault system restores electricity, the program are not influenced by multistage statements based on collusion lines branch load.
Device judges whether route breaks down using current differential, and differential criterion includes following aspects:
1) forward-order current differential relay
Wherein I1CDIt is Sequence Differential Current, I1RIt is positive sequence stalling current, I1SetIt is that Sequence Differential Current protection starting is fixed
Value, k1It is Sequence Differential proportional brake coefficient.
2) negative-sequence current differential relay
Wherein I2CDIt is Negative Sequence Differential electric current, I1RIt is negative sequence braking electric current, I1SetIt is that the starting of Negative Sequence Differential current protection is fixed
Value, k1It is Negative Sequence Differential proportional brake coefficient.
3) mutually differential phase selector relay
WhereinIt is each phase difference current,It is each phase stalling current, ISetIt is that split-phase difference current starts definite value, k
It is mutually differential phase selection element proportional brake coefficient.
Fig. 3 is adaptive distance protection logic step schematic diagram, and detailed comprehensive differential protection realizes that steps are as follows:
1) Sequence Differential Current and positive sequence stalling current are respectively formed by forward-order current of this side after synchronous with opposite side, constituted
Sequence Differential element；
2) Negative Sequence Differential electric current and negative dynamic stalling current are respectively formed by negative-sequence current of this side after synchronous with opposite side, constituted
Negative Sequence Differential element.
3) split-phase difference current and split-phase stalling current are formed by split-phase electric current of this side after synchronous with opposite side, constitutes split-phase
Current differential element.
4) when block signal in forward-order current difference element movement, no area, and three-phase phase current differential element acts, and sentences
For three-phase fault in area, when block signal in negative-sequence current difference element movement, no area, and single-phase or two-phase phase current differential is first
Part movement, is judged to unbalanced fault in area.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention, all
According to the technical idea provided by the invention, any changes made on the basis of the technical scheme each falls within the scope of the present invention
Within.
Claims (5)
1. a kind of differential protection method of discrimination based on combined sequence components, it is characterised in that the following steps are included:
Troubles inside the sample space is differentiated using forward-order current difference element and negative-sequence current difference element, is known using differential current element
Other failure is separate；
When Sequence Differential Current element movement and differential phase selection result is three-phase fault, and without troubles inside the sample space block signal, then
It is judged to three-phase fault in area；
When the movement of Negative Sequence Differential current element and differential phase selection result is single-phase or phase to phase fault, and is latched without troubles inside the sample space
Signal is then judged to unbalanced fault in area.
2. the differential protection method of discrimination based on combined sequence components as described in claim 1, it is characterised in that: Sequence Differential member
Part is for reflecting three-phase fault；Sequence Differential Current and positive sequence braking electricity are formed by forward-order current of this side after synchronous with opposite side
Stream constitutes Sequence Differential element.
3. the differential protection method of discrimination based on combined sequence components as described in claim 1, it is characterised in that: Negative Sequence Differential member
Part is for reflecting unbalanced fault；Negative Sequence Differential electric current and negative sequence braking electricity are formed by negative-sequence current of this side after synchronous with opposite side
Stream constitutes Negative Sequence Differential element.
4. the differential protection method of discrimination based on combined sequence components as described in claim 1, it is characterised in that: three-phase difference stream
Phase selection element acts and Sequence Differential element movement, is judged to three-phase fault in area；Single-phase or two-phase phase current differential element
Movement and the movement of Negative Sequence Differential current element, are judged to single-phase in area or phase to phase fault.
5. the differential protection method of discrimination based on combined sequence components as described in claim 1, it is characterised in that: Sequence Differential member
After part or Negative Sequence Differential element movement, it is failure to actuate and if only if troubles inside the sample space block signal, is just judged to troubles inside the sample space；If area
Internal fault block signal acts, then Sequence Differential Current element or Negative Sequence Differential current element exercise void.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510729243.3A CN106655115B (en) | 2015-10-31 | 2015-10-31 | Differential protection method of discrimination based on combined sequence components |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510729243.3A CN106655115B (en) | 2015-10-31 | 2015-10-31 | Differential protection method of discrimination based on combined sequence components |
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| CN106655115A CN106655115A (en) | 2017-05-10 |
| CN106655115B true CN106655115B (en) | 2019-01-25 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111480275B (en) | 2017-12-20 | 2022-12-30 | 日立能源瑞士股份公司 | Zero sequence current based differential protection for power transmission lines |
| CN111884244A (en) * | 2020-07-28 | 2020-11-03 | 国网经济技术研究院有限公司 | Method and system for judging phase of alternating current fault on converter transformer valve side |
| CN112398098B (en) * | 2020-10-23 | 2023-03-21 | 许继电气股份有限公司 | Positive sequence variable differential protection method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599181A (en) * | 2004-07-21 | 2005-03-23 | 烟台东方电子信息产业股份有限公司 | Negative-sequence longitudinal differential element for electric system |
| CN102412569A (en) * | 2011-11-28 | 2012-04-11 | 北京四方继保自动化股份有限公司 | Method for starting longitudinal differential protection by using fault component |
| CN103701107A (en) * | 2013-12-26 | 2014-04-02 | 北京四方继保自动化股份有限公司 | Adaptive differential protection method |
-
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- 2015-10-31 CN CN201510729243.3A patent/CN106655115B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599181A (en) * | 2004-07-21 | 2005-03-23 | 烟台东方电子信息产业股份有限公司 | Negative-sequence longitudinal differential element for electric system |
| CN102412569A (en) * | 2011-11-28 | 2012-04-11 | 北京四方继保自动化股份有限公司 | Method for starting longitudinal differential protection by using fault component |
| CN103701107A (en) * | 2013-12-26 | 2014-04-02 | 北京四方继保自动化股份有限公司 | Adaptive differential protection method |
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