CN107026430A - A kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate - Google Patents
A kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate Download PDFInfo
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- CN107026430A CN107026430A CN201610066535.8A CN201610066535A CN107026430A CN 107026430 A CN107026430 A CN 107026430A CN 201610066535 A CN201610066535 A CN 201610066535A CN 107026430 A CN107026430 A CN 107026430A
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- 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
- H02H7/267—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 for parallel lines and wires
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate, phase selection step during line failure is as follows：(1) using the electrical quantity of single loop line, U is worked as2When ≠ 0, voltage jump amount Δ U is calculatedAB, Δ UBCWith Δ UCA, six phase region failures of double line down are divided according to protection installation place voltage jump amount magnitude relation；(2) the jump-value of current Δ I of two loop lines is calculatedAB, Δ IBCWith Δ ICA, the further failure of six phase region failures of double line down is divided according to the protection each jump-value of current phase in installation place and magnitude relation；(3) U is worked as2When=0, sequence impedance Δ Z1And Z2Differentiate the failure of this loop line protection element.The present invention has very strong versatility, it is applicable under the various methods of operation of double loop；With very strong flexibility；Accurate phase selection result is more conducive to impedance computation and fault localization, reclosing etc.；With higher reliability.
Description
Technical field
It is in particular to a kind of based on the same of single-ended Sudden Changing Rate the present invention relates to a kind of protection algorism of high-tension line
Bar double loop phase-selecting method.
Background technology
Double-circuit lines on the same pole has been widely applied in 220kV and above system.It is double with bar
When loop line breaks down, particularly cross line fault when, the action correctness and reliability of relay protection will greatly shadows
Ring the safe and stable operation and transmission reliability of power system.
At present, the phase-selecting method applied to the double-circuit line on same pole at scene is derived from mostly improves tradition suitable for single loop line
The phase-selecting method based on single-ended single loop line electrical quantity.Such phase-selecting method can be selected correctly in single line down
Phase, this line down phase can only be selected when occurring cross line fault, and separate to adjacent line failure can not be judged.
Six-order component phase selection can preferably recognize in theory all kinds of single line downs that double-circuit lines on the same pole occurs and
Cross line fault, but in positive and negative two points fault, easily falsely drop phase.
If cross line fault occurs and during cross line fault generation, protected for the suitable distance of fault type and separate selection
Shield algorithm is to ensure one of distance protection energy correct operation essential condition.Meanwhile, line fault is mostly
Transient fault is, it is necessary to which the correct phase selection of phase selection element, basis is provided for the appropriate reclosing strategy of input, it is ensured that
Reclosing success.
The content of the invention
For mentioned in background technology double-circuit line on same pole presence phase selection tripping, malfunction the problems such as, the present invention propose
A kind of Sudden Changing Rate phase-selecting method suitable for double-circuit line on same pole.This method calculates voltage using two loop line electrical quantity
Fault Phase Selection is realized with jump-value of current.The three-phase voltage obtained first according to measurement calculates voltage jump amount,
First phase selection foundation is used as according to the magnitude relation between three Sudden Changing Rates；Two loop lines obtained further according to measurement are each
From three-phase current calculate jump-value of current, according to the magnitude relation between jump-value of current further complete choosing
Phase, realizes the separate complete differentiation of failure.The present invention can be made up at present applied to other phase selections on double loop
The drawbacks of method phase-selecting function does not even falsely drop phase comprehensively.
The technical problem of the present invention is mainly addressed by following technical proposals：
A kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate, it is characterised in that during line failure
Phase selection step it is as follows：
(1) using the electrical quantity of single loop line, U is worked as2When ≠ 0, voltage jump amount Δ U is calculatedAB, Δ UBCWith Δ UCA,
Six phase region failures of double line down are divided according to protection installation place voltage jump amount magnitude relation；
(2) the jump-value of current Δ I of two loop lines is calculatedAB, Δ IBCWith Δ ICA, according to the protection each electric current in installation place
Sudden Changing Rate phase and magnitude relation divide the further failure of six phase region failures of double line down；
(3) U is worked as2When=0, sequence impedance Δ Z1And Z2Differentiate the failure of this loop line protection element.
Further, voltage jump amount Δ U is calculatedAB、ΔUBCWith Δ UCA, dashed forward according to the protection each voltage in installation place
Variation amplitude relation does the division of similar 6 phase selection subregions of single line down.
Further, for IAIIABC, (A phase phase to phase fault occurs for I loop lines, and ABC occurs for II loop lines
Alternate phase to phase fault), IAG (I loop lines occur A phases earth fault), (A phases occur IAIIAG for I loop lines
A phases earth fault occurs for earth fault, II loop lines), IABIIAC and IACIIAB fault distinguish, using each
Loop line jump-value of current Δ IIAB, Δ IIBC, Δ IICA, Δ IIIAB, Δ IIIBC, Δ IIICABetween magnitude relation divide
All kinds of cross line faults,
Wherein：The AB failures of II loop lines, are superimposed C fault current on I loop lines are approximate；
The A failures of II loop lines, are superimposed BC fault current on I loop lines are approximate.
Further discriminate between IAG, IAIIAG；Enter one using the magnitude relation between two line down current weights
Step divides fault type,
With formula Δ II/ΔIII>1.3 determine whether to there occurs IAG failures；According to formula Δ III/ΔII>1.3, it is determined that there occurs
IIAG failures or IAIIAG failures.
Further, with each loop line jump-value of current Δ IIAB, Δ IIBC, Δ IICA, Δ IIIAB, Δ IIIBC, Δ IIICA
Between magnitude relation, distinguish following all kinds of cross line faults：
IBIIC、IBIIBC、IBCIIC、IBCIIB、IBCIIABC、ICIIB、ICIIBC、IBC、IIBC
Or IBCIIBC failures.
Further, with the magnitude relation between two line down current weights, distinguish failure IBC or
IBCIIBC,
With formula Δ IIBC/ΔIIIBC>1.3 determine whether to there occurs IBC failures, with formula Δ IIIBC/ΔIIBC>1.3 determine hair
Give birth to IIBC failures or give birth to IBCIIBC failures.
Further, as break down IABC, IABCIIABC or IAIIBCG, (I loop lines occur A and connected
The alternate earth faults of BC occur for earth fault, II loop lines) when, protect installation place negative sequence voltage U2=0, when,
Then according to current judgement fault type.
Compared with prior art, the invention has the advantages that：
1st, the targeted double line down phase selection of the present invention, with intelligent substation Fast Construction, two loop lines are very
Easily realize that electrical quantity is shared, using double-circuit line as protection location on the premise of, deterministic process is based on double loop list
Electrical quantity is held, with very strong versatility, it is applicable under the various methods of operation of double loop.
2nd, the present invention can further carry out Fault Phase Selection with reference to the phase selection information of adjacent line, with very strong flexibility.
3rd, accurately phase selection result is more conducive to impedance computation and fault localization, reclosing etc. to the present invention.
4th, the present invention can preferably realize the distance protection of this circuit and reclosing correct operation, adjacent lines event
The correct locking of barrier protection, with higher reliability.
Brief description of the drawings
Fig. 1 is double loop cross line fault system diagram.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings, and following examples are only used for clearly illustrating this
The technical scheme of invention, and can not be limited the scope of the invention with this.
Embodiment：
1st, a kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate proposed, in line failure,
Using following phase-selecting method：
(1) using the electrical quantity of single loop line, U is worked as2When ≠ 0, voltage jump amount Δ U is calculatedAB, Δ UBC, Δ UCA,
By judging protection installation place voltage jump amount magnitude relation, the seven phase region failures for carrying out double line down are divided；
(2) further, the jump-value of current Δ I of two loop lines is calculatedAB, Δ IBC, Δ ICA.By judging protection peace
Each jump-value of current phase and magnitude relation at dress, the further failure for carrying out double line down are divided；
(3) U is worked as2When=0, by sequence impedance Δ Z1, Z2Complete the fault distinguishing of this loop line protection element.
2nd, voltage jump amount Δ U is calculatedAB, Δ UBC, Δ UCA, by judging the protection each voltage jump in installation place
Measure the relation that magnitude relation carries out similar single 6 phase selection subregions of line down.(need according to emulation, to the source of an allusion
Offset)
3rd, for further discriminating between IAIIABC, IAG, IAIIAG, IABIIAC, IACIIAB failure,
Propose to utilize each loop line jump-value of current Δ IIAB, Δ IIBC, Δ IICA, Δ IIIAB, Δ IIIBC, Δ IIICABetween width
Value relation further completes the differentiation of all kinds of cross line faults.
| I line down features | II line down features | Fault type |
| ΔIIBC<<(ΔIIAB,ΔIICA) | ΔIIIAB=Δ IIIBC=Δ IIICA | IAIIABC |
| ΔIIBC<<(ΔIIAB,ΔIICA) | ΔIIIBC<<(ΔIIIAB,ΔIIICA) | IAG、IAIIAG、IIAG |
| ΔIICA>(ΔIIBC,ΔIIAB) | ΔIIIAB>(ΔIIIBC,ΔIIICA) | IACIIAB |
| ΔIIAB>(ΔIIBC,ΔIICA) | ΔIIICA>(ΔIIIBC,ΔIIIAB) | IABIIAC |
Note：The AB failures of II loop lines, have been superimposed C fault current on I loop lines are approximate.
The A failures of II loop lines, have been superimposed BC fault current on I loop lines are approximate.
4th, IAG, IAIIAG are further discriminated between；Propose to utilize the amplitude between two line down current weights to close
The further fault type that completes of system is distinguished.If meeting Δ I between fault component electric currentI/ΔIII>1.3, then it there occurs
IAG failures, if meeting Δ I between fault component electric currentII/ΔII>1.3, then IIAG failures are there occurs, are otherwise sent out
IAIIAG is given birth to.
5th, for further discriminate between IBIIC, IBIIBC, IBCIIC, IBCIIB, IBCIIABC, ICIIB,
ICIIBC, IBC, IIBC, IBCIIBC failure, propose to utilize each loop line jump-value of current Δ IIAB, Δ IIBC,
ΔIICA, Δ IIIAB, Δ IIIBC, Δ IIICABetween magnitude relation further complete the differentiations of all kinds of cross line faults.
| I line down features | II line down features | Fault type |
| ΔIICA<<(ΔIIAB,ΔIIBC) | ΔIIIAB<<(ΔIIICA,ΔIIIBC) | IBIIC |
| ΔIICA<<(ΔIIAB,ΔIIBC) | ΔIIIBC>(ΔIIIAB,ΔIIICA) | IBIIBC |
| ΔIIBC>(ΔIIAB,ΔIICA) | ΔIIIAB<<(ΔIIICA,ΔIIIBC) | IBCIIC |
| ΔIIBC>(ΔIIAB,ΔIICA) | ΔIIICA<<(ΔIIIAB,ΔIIIBC) | IBCIIB |
| ΔIIBC>(ΔIIAB,ΔIICA) | ΔIIIAB=Δ IIIBC=Δ IIICA | IBCIIABC |
| ΔIIBC>(ΔIIAB,ΔIICA) | ΔIIIBC>(ΔIIIAB,ΔIIICA) | IBC、IBCIIBC、IIBC |
| ΔIIAB<<(ΔIICA,ΔIIBC) | ΔIIICA<<(ΔIIIAB,ΔIIIBC) | ICIIB |
| ΔIIAB<<(ΔIICA,ΔIIBC) | ΔIIIBC>(ΔIIIAB,ΔIIICA) | ICIIBC |
6th, IBC, IBCIIBC are further discriminated between；Propose to utilize the amplitude between two line down current weights to close
The further fault type that completes of system is distinguished.If meeting Δ I between fault component electric currentIBC/ΔIIIBC>1.3, then send out
IBC failures are given birth to, if meeting Δ I between positive sequence fault component electric currentIIBC/ΔIIBC>1.3, IIBC failures are there occurs,
Otherwise it there occurs IBCIIBC.
7th, as break down (IABC, IABCIIABC, IAIIBCG), protection installation place is also without negative phase-sequence electricity
Pressure, i.e. U2=0.Accordingly, it would be desirable to according to electric current come discriminating fault types.
Above content is only embodiments of the invention, and its purpose is not intended to system proposed by the invention and side
The limitation of method, protection scope of the present invention is defined by claim.The spirit and scope of the present invention are not being departed from
In the case of, those skilled in the art without departing from the scope and spirit of the invention, the pass carried out to it
It all should be fallen within the scope and spirit of the invention in a variety of obvious modifications or change of form and details.
Claims (7)
1. a kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate, it is characterised in that event occurs for circuit
Phase selection step during barrier is as follows：
(1) using the electrical quantity of single loop line, U is worked as2When ≠ 0, voltage jump amount Δ U is calculatedAB, Δ UBCWith Δ UCA,
Six phase region failures of double line down are divided according to protection installation place voltage jump amount magnitude relation；
(2) the jump-value of current Δ I of two loop lines is calculatedAB, Δ IBCWith Δ ICA, according to the protection each electric current in installation place
Sudden Changing Rate phase and magnitude relation divide the further failure of six phase region failures of double line down；
(3) U is worked as2When=0, sequence impedance Δ Z1And Z2Differentiate the failure of this loop line protection element.
2. a kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate as claimed in claim 1, it is special
Levy and be, calculate voltage jump amount Δ UAB、ΔUBCWith Δ UCA, according to the protection each voltage jump amount width in installation place
Value relation does the division of similar 6 phase selection subregions of single line down.
3. a kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate as claimed in claim 2, it is special
Levy and be, for IAIIABC, IAG, IAIIAG, IABIIAC and IACIIAB fault distinguish, utilize
Each loop line jump-value of current Δ IIAB, Δ IIBC, Δ IICA, Δ IIIAB, Δ IIIBC, Δ IIICABetween magnitude relation draw
Divide all kinds of cross line faults,
Wherein：The AB failures of II loop lines, are superimposed C fault current on I loop lines are approximate；
The A failures of II loop lines, are superimposed BC fault current on I loop lines are approximate.
4. a kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate as claimed in claim 3, it is special
Levy and be, further discriminate between IAG, IAIIAG；Utilize the magnitude relation between two line down current weights
Fault type is further divided,
With formula Δ II/ΔIII>1.3 determine whether to there occurs IAG failures；According to formula Δ III/ΔII>1.3, it is determined that there occurs
IIAG failures or IAIIAG failures.
5. a kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate as claimed in claim 2, it is special
Levy and be, with each loop line jump-value of current Δ IIAB, Δ IIBC, Δ IICA, Δ IIIAB, Δ IIIBC, Δ IIICABetween
Magnitude relation, distinguishes following all kinds of cross line faults：
IBIIC、IBIIBC、IBCIIC、IBCIIB、IBCIIABC、ICIIB、ICIIBC、IBC、IIBC
Or IBCIIBC failures.
6. a kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate as claimed in claim 4, it is special
Levy and be, with the magnitude relation between two line down current weights, distinguish failure IBC or IBCIIBC,
With formula Δ IIBC/ΔIIIBC>1.3 determine whether to there occurs IBC failures, with formula Δ IIIBC/ΔIIBC>1.3 determine hair
Give birth to IIBC failures or give birth to IBCIIBC failures.
7. a kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate as claimed in claim 1, it is special
Levy and be, when break down IABC, IABCIIABC or IAIIBCG when, protect installation place negative sequence voltage
U2=0, when, then according to current judgement fault type.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649540A (en) * | 2018-05-11 | 2018-10-12 | 西安理工大学 | A kind of parallel double loop road current balance protection method based on same vector current |
| CN109085450A (en) * | 2018-08-24 | 2018-12-25 | 国网河北省电力有限公司电力科学研究院 | Low current neutral grounding system fault phase-selecting method and device |
| CN110133452A (en) * | 2019-07-01 | 2019-08-16 | 华北电力大学 | Mixed pressure based on waveform correlation coefficient and jump-value of current is the same as tower fault phase-selecting method |
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| CN102914726A (en) * | 2012-11-07 | 2013-02-06 | 华北电力大学（保定） | Fault positioning method for common-tower double-circuit line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102914726A (en) * | 2012-11-07 | 2013-02-06 | 华北电力大学（保定） | Fault positioning method for common-tower double-circuit line |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649540A (en) * | 2018-05-11 | 2018-10-12 | 西安理工大学 | A kind of parallel double loop road current balance protection method based on same vector current |
| CN109085450A (en) * | 2018-08-24 | 2018-12-25 | 国网河北省电力有限公司电力科学研究院 | Low current neutral grounding system fault phase-selecting method and device |
| CN109085450B (en) * | 2018-08-24 | 2020-10-09 | 国网河北省电力有限公司电力科学研究院 | Fault phase selection method and device for low-current grounding system |
| CN110133452A (en) * | 2019-07-01 | 2019-08-16 | 华北电力大学 | Mixed pressure based on waveform correlation coefficient and jump-value of current is the same as tower fault phase-selecting method |
| CN110133452B (en) * | 2019-07-01 | 2020-03-10 | 华北电力大学 | Mixed-voltage same-tower fault phase selection method based on waveform correlation coefficient and current mutation quantity |
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| CN107026430B (en) | 2019-11-08 |
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