CN108649540A - A kind of parallel double loop road current balance protection method based on same vector current - Google Patents
A kind of parallel double loop road current balance protection method based on same vector current Download PDFInfo
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- CN108649540A CN108649540A CN201810448045.3A CN201810448045A CN108649540A CN 108649540 A CN108649540 A CN 108649540A CN 201810448045 A CN201810448045 A CN 201810448045A CN 108649540 A CN108649540 A CN 108649540A
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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
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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
Abstract
The double-circuit line current balance protection method based on same vector current that the invention discloses a kind of, specifically comprises the steps of.First, Fault Phase Selection is realized using same vectorial jump-value of current.Secondly, Judging fault is mutually single loop line failure or cross line fault.Whether it is mutually directly cross line fault using contravariant vector current judgement failure for single-phase fault；Whether it is mutually single loop line failure first with contravariant vector current judgement failure for phase to phase fault, three-phase fault, if not whether being mutually then cross line fault using contravariant vector and the further Judging fault of Amplitude Ration with vector.If cross line fault, the impedor constituted using same vector current and voltage judges whether protection acts；If single loop line failure, route selection tripping is carried out using the amplitude size of phase current of the same name.The present invention can react cross line fault, and protective value is improved.
Description
Technical field
The invention belongs to current balance protection technical fields, are related to a kind of parallel double loop road electricity based on same vector current
Mobile equilibrium guard method.
Background technology
Parallel lines on same tower parallel double loop has many advantages, such as that transmission line corridor is narrow, transmission line capability is big, reliable for operation, therefore in electric power
It is widely applied in system.But due to the problems such as there are zero-sequence mutual inductance between line and cross line faults, need to carry out parallel double
The research of loop line protection.
In order to simplify wiring, traditional parallel lines on same tower parallel double loop protection is configured by single loop line.Wherein, differential current
Protection relies on communication port, reliability effect protective value.Pilot zero sequence direction relay is in line end singlephase earth fault
When, it protects the residual voltage of installation place small, the tripping of zero-sequence direction component may be caused.And it is grounded in the strong magnetic of light current
When failure or disconnection fault, zero-sequence mutual inductance can lead to the pilot zero sequence direction relay malfunction of another loop line between line.Distance is protected
Shield, due to the influence of zero-sequence mutual inductance, causes it to adjust complexity, and when singlephase earth fault, may cause relay fail or malfunction；
When IBIIC type cross line faults, distance protection is easy to be determined as phase to phase fault, to cause the equal three-phase tripping of two loop lines, seriously
The stability of influence system.For distance protection there are the problem of, two class solutions are suggested.A kind of method is based on distance and protects
Single loop line configuration is protected, another kind of method is the distance protection using double loop electrical quantity, and method is introduce another loop line zero
Sequence electric current compensates.Currently, the method for introducing another loop line zero sequence current compensation obtains more research, but this method is by double back
The method of operation of line is affected.
Current balance protection for parallel lines on same tower parallel double loop road does not need channel, reliability height, operation and maintenance letter
It is single.And traditional current balance protection cannot react cross line fault, existing relaying configuration scheme is configured based on single loop line in addition,
Limit the application of current balance protection.Though the frequency that single loop line failure occurs in double loop is higher than cross line fault, cross-line event
Barrier is likely to result in the serious consequence that double loop trips once occurring.Therefore, it is necessary to study the protections of reaction cross line fault
Principle and method.In recent years, China greatly develops intelligent substation, and protection information is derived from combining unit, can obtain simultaneously
To the current information of double loop, has the condition for realizing current balance protection.Electronic mutual inductor is used in intelligent substation,
Also the current balance protection based on the magnitude of current is made not influenced by mutual inductor saturation.
Invention content
The object of the present invention is to provide a kind of parallel double loop road current balance protection method based on same vector current, energy
Enough realize the differentiation of cross line fault.
The technical solution adopted in the present invention is a kind of parallel double loop road current balance protection based on same vector current
Method is specifically implemented according to the following steps：
Step 1, Fault Phase Selection：The current information of two loop lines is collected by combining unit, and is calculated with vectorial phase current
Poor Sudden Changing Rate selects failure phase according to calculated with vectorial current-difference sudden-change component；
Step 2, failure line selection：Select failure phase according to step 1, using contravariant vector current amplitude, contravariant vector electric current with it is same
The Amplitude Ration subsidiary discriminant failure of vector current is mutually single loop line failure or cross line fault；
If cross line fault, using busbar voltage and constitutes impedor with vector current and judge whether protection acts；
If single loop line failure, fault wire, protection act tripping circuit breaker are selected using the amplitude size of phase current of the same name.
The features of the present invention also characterized in that：
Step 1 detailed process is：
Step 1.1, the electric current for collecting two loop lines simultaneously using combining unitAnd voltage
Step 1.2 is calculated with vectorial jump-value of current
It is each to be respectively with vectorial current-difference sudden-change component：
ΔITAB=| Δ ITA-ΔITB|、ΔITBC=| Δ ITB-ΔITC|、ΔITCA=| Δ ITC-ΔITA|；
Step 1.3 selects Δ ITAB、ΔITBC、ΔITCAThe numerical value of middle minimum, by two bigger numericals respectively with minimum number
Value is compared；
If two ratios are not less than 5, which is single-phase fault,；
If two ratios are not respectively less than 5, which is not single-phase fault, then needs to judge：
In formula (2), | Δ ITmax|=max { Δ ITAB,ΔITBC,ΔITCA}；|ΔITmin|=min { Δ ITAB,ΔITBC,Δ
ITCA}；K1It is adjusted by the maximum scale value occurred when escaping three-phase fault.
Judging fault is mutually single loop line failure or cross line fault in step 2, and specific method is：
Whether it is single-phase fault to select failure mutually when step 1, be single loop line event using contravariant vector current amplitude Judging fault
Barrier；If not single loop line failure, then be cross line fault；
It is phase to phase fault or three-phase fault to select failure mutually when step 1, then first with contravariant vector current amplitude principium identification
Whether failure is mutually single loop line failure；Recycle contravariant vector electric current and same vector current Amplitude Ration subsidiary discriminant failure phase whether
For cross line fault, if not cross line fault, then be single loop line failure.
Whether it is that single loop line fault method is using contravariant vector current amplitude Judging fault：
Measure the jump-value of current of a certain phase of I loop linesThe jump-value of current of a certain phase of II loop lines
Calculate contravariant vector jump-value of current The failure phase selected for step 1；
Contravariant vector jump-value of current threshold value Δ I is setFmin, and compare contravariant vector jump-value of currentWith contravariant vector electricity
Flow Sudden Changing Rate threshold value Δ IFmin；
IfMore than Δ IFmin, then it is single loop line failure；
IfLess than Δ IFmin, then it is not single loop line failure.
Assistant criteria is made to determine whether：JudgeWhether it is less than
IfIt is less thanIt is then cross line fault；
IfIt is not less thanIt is not then cross line fault；
Wherein, σ is determined according to line parameter circuit value.
Fault wire is selected using the amplitude size of phase current of the same name, detailed process is：
Indicate the jump-value of current of a certain phase of I loop lines,Indicate the jump-value of current of a certain phase of II loop lines,
IfBe then I loop lines it is fault wire；
IfBe then II loop lines it is fault wire.
K2Value is 1.05-1.1.
The beneficial effects of the invention are as follows：
A kind of parallel double loop road current balance protection method based on same vector current of the present invention, relative to traditional electricity
Mobile equilibrium protection scheme can react cross line fault；The present invention is not need channel based on the protection of single-ended double loop information,
Reliability is high；The development of intelligent substation is with construction for the present invention provides the conditions of realization.
Description of the drawings
Fig. 1 is that failure is mutually sentenced in a kind of parallel double loop road current balance protection method based on same vector current of the present invention
Other flow chart；
Route selection flow chart when Fig. 2 is single-phase fault in the present invention；
Route selection flow chart when Fig. 3 is phase to phase fault in the present invention；
Route selection flow chart when Fig. 4 is three-phase fault in the present invention；
Fig. 5 is the analogue system figure of embodiment.
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of parallel double loop road current balance protection method based on same vector current of the present invention, specifically according to following step
It is rapid to implement：
Step 1, Fault Phase Selection：As shown in Figure 1, collecting the current information of two loop lines by combining unit, and calculate same
Vectorial current-difference sudden-change component selects failure phase according to calculated with vectorial current-difference sudden-change component；
Detailed process is：
Step 1.1, the electric current for collecting two loop lines simultaneously using combining unitAnd voltage
Step 1.2 is calculated with vectorial jump-value of current
It is each to be respectively with vectorial current-difference sudden-change component：
ΔITAB=| Δ ITA-ΔITB|、ΔITBC=| Δ ITB-ΔITC|、ΔITCA=| Δ ITC-ΔITA|；
Step 1.3 selects Δ ITAB、ΔITBC、ΔITCAThe numerical value of middle minimum, by two bigger numericals respectively with minimum number
Value is compared；
If two ratios are not less than 5, which is single-phase fault, and numerical value minimum is the mutation of non-faulting three-phase current
Amount；
If two ratios are not respectively less than 5, which is not single-phase fault, then needs to judge：
In formula (2), | Δ ITmax|=max { Δ ITAB,ΔITBC,ΔITCA}；|ΔITmin|=min { Δ ITAB,ΔITBC,Δ
ITCA}；K1It is adjusted by the maximum scale value occurred when escaping three-phase fault.
Step 2, failure line selection：Select failure phase according to step 1, using contravariant vector current amplitude, contravariant vector electric current with it is same
The Amplitude Ration subsidiary discriminant failure of vector current is mutually single loop line failure or cross line fault；
Judging fault is mutually single loop line failure or cross line fault, and specific method is：
Whether it is single-phase fault to select failure mutually when step 1, be mutually single loop line using contravariant vector current amplitude Judging fault
Failure；If not single loop line failure, then be cross line fault；
It is phase to phase fault or three-phase fault to select failure mutually when step 1, then first with contravariant vector current amplitude principium identification
Whether failure is mutually single loop line failure；Recycle contravariant vector electric current and same vector current Amplitude Ration subsidiary discriminant failure phase whether
For cross line fault, if not cross line fault, then be single loop line failure.
As shown in Fig. 2, whether being mutually that single loop line fault method is using contravariant vector current amplitude Judging fault：
Measure the jump-value of current of a certain phase of I loop linesThe jump-value of current of a certain phase of II loop lines
Calculate contravariant vector jump-value of current The failure phase selected for step 1；
Contravariant vector jump-value of current threshold value Δ I is setFmin, and compare contravariant vector jump-value of currentWith contravariant vector electricity
Flow Sudden Changing Rate threshold value Δ IFmin；
IfMore than Δ IFmin, then it is single loop line failure；
IfLess than Δ IFmin, then it is not single loop line failure.
Assistant criteria is made to determine whether：JudgeWhether it is less than
IfIt is less thanIt is then cross line fault；
IfIt is not less thanIt is not then cross line fault；
Wherein, σ is line parameter circuit value coefficient.
If cross line fault, using busbar voltage and constitutes impedor with vector current and judge whether protection acts；
If single loop line failure, fault wire, protection act tripping circuit breaker are selected using the amplitude size of phase current of the same name.
Selecting fault wire detailed process using the amplitude size of phase current of the same name is：
Indicate the jump-value of current of a certain phase of I loop lines,Indicate the jump-value of current of a certain phase of II loop lines,
IfBe then I loop lines it is fault wire；
IfBe then II loop lines it is fault wire.
K2Value is 1.05-1.1.
Embodiment
For a certain long 300km, voltage class is that the bilateral source parallel double loop road transmission system of 500kV has carried out this
The verification of invention protection scheme, as shown in Figure 5.
Systematic parameter is：M side system positive sequence impedances ZM1=j49.34 Ω, zero sequence impedance ZM0=j141.34 Ω；N side systems
Positive sequence impedance ZN1=j46.03 Ω, zero sequence impedance ZN0=j103.36 Ω.Line parameter circuit value：Positive sequence impedance Z1=0.034003+
j0.68001Ω/km；Zero sequence impedance Z0=0.307504+j2.3 Ω/km；Mutual impedance Z between linem=0.090833+j0.38334
Ω/km；Positive sequence capacitance C1=0.0124 μ F/km；Zero sequence capacitance C0=0.0187 μ F/km；Inductance and Capacitance C between linem=
0.00041667μF/km.Circuit both ends power supply phase angle difference is 30 °.Critical parameter takes K1=1.82, K2=1.05, | Δ IFmin1|
=0.05kA, | Δ IFmin2|=1kA, | Δ IFmin3|=1.79kA, σ=0.43.Wherein, | Δ IFmin1|、|ΔIFmin2|、|Δ
IFmin3| the threshold value of cross line fault is differentiated when being respectively single-phase, two-phase, three-phase fault.
By taking IA-G, IAIIA-G, IBIIC, IBCIIB, IABCIIA as an example, phase selection scheme is verified, wherein Δ ITAB
=| Δ ITA-ΔITB|；ΔITBC=| Δ ITB-ΔITC|；ΔITCA=| Δ ITC-ΔITA|；|ΔITmax|=max { Δ ITAB,Δ
ITBC,ΔITCA}；|ΔITmin|=min { Δ ITAB,ΔITBC,ΔITCA}。
1 IA-G current-difference sudden-change components of table
2 IAIIA-G current-difference sudden-change components of table
3 IBIIC current-difference sudden-change components of table
4 IBCIIB current-difference sudden-change components of table
5 IABCIIA current-difference sudden-change components of table
From table 1,2 simulation result of table as it can be seen that Δ ITBCMuch smaller than Δ ITAB、ΔITCA, according to the optional phase that is out of order of Fig. 1 flows
For A phases.
By table 3,4 simulation result of table as it can be seen that Δ ITBCIt is much smaller than Δ ITAB、ΔITCA, BC phases can be selected according to Fig. 1 flows
Fault signature is most apparent, and | Δ ITmax|/|ΔITmin| value is more than 1, as phase to phase fault.
By 5 simulation result of table as it can be seen that Δ ITBC、ΔITAB、ΔITCAIt is not much different, and due to | Δ ITmax|/|ΔITmin| value
Close to 1, you can be selected as three-phase fault.It should be pointed out that table 2-5 fault types are cross line fault.
From simulation result as it can be seen that context of methods can correctly select failure phase when cross line fault, and not by abort situation
It influences.
For the correctness of verificating current balanced protection, it is with IA-G, IAIIA-G, IBIIC, IBCIIB, IABCIIA etc.
Example carries out circuit the emulation of protection scheme, wherein For A, B or
C。
6 IA-G simulation results of table
7 IAIIA-G simulation results of table
8 IBIIC simulation results of table
9 IBCIIB simulation results of table
10 IABCIIA simulation results of table
Contrast table 6 and table 7, Δ IFA is larger in IA-G, but is 0 when IAIIA-G, can distinguish cross line fault.Table 6-
10 give the simulation result of different faults position, demonstrate the correctness of protection variant projects of location.Such as, using data in table 10,
It can clearly show that A phases are cross line fault, B, C two-phase are single loop line failure, and can differentiate I loop line B, C phase faults.
Physical fault usually there will be transition resistance, herein to also being emulated through transition Resistance Fault.The result shows that
Protection scheme proposed in this paper is influenced smaller by transition resistance.Table 11 gives circuit midpoint through transition resistance IBCIIB-G
Simulation result when failure.By table 11 as it can be seen that can correctly be acted through context of methods when transition Resistance Fault.
Table 11 is through IBCIIB simulation results when transition resistance
By the above-mentioned means, a kind of parallel double loop road current balance protection method based on same vector current of the present invention,
Step 1, Fault Phase Selection：The current information of two loop lines is collected by combining unit, and is calculated with vectorial current-difference sudden-change component,
According to calculated failure phase is selected with vectorial current-difference sudden-change component；Step 2, failure line selection：Failure is selected according to step 1
Phase, the Amplitude Ration subsidiary discriminant failure using contravariant vector current amplitude, contravariant vector electric current and same vector current are mutually single loop line events
Barrier or cross line fault；If cross line fault, constitute whether impedor judges protection using busbar voltage and with vector current
Action；If single loop line failure, fault wire, protection act tripping circuit breaker are selected using the amplitude size of phase current of the same name.Phase
For traditional current balance protection scheme, cross line fault can be reacted；The present invention is the protection based on single-ended double loop information,
Channel is not needed, reliability is high；The development of intelligent substation is with construction for the present invention provides the conditions of realization.
Claims (7)
1. a kind of parallel double loop road current balance protection method based on same vector current, which is characterized in that specifically according to
Lower step is implemented：
Step 1, Fault Phase Selection：The current information of two loop lines is collected by combining unit, and is calculated prominent with vectorial phase differential current
Variable selects failure phase according to calculated with vectorial current-difference sudden-change component；
Step 2, failure line selection：Failure phase is selected according to step 1, utilizes contravariant vector current amplitude, contravariant vector electric current and same vector
The Amplitude Ration subsidiary discriminant failure of electric current is mutually single loop line failure or cross line fault；
If cross line fault, using busbar voltage and constitutes impedor with vector current and judge whether protection acts；
If single loop line failure, fault wire, protection act tripping circuit breaker are selected using the amplitude size of phase current of the same name.
2. a kind of parallel double loop road current balance protection method based on same vector current according to claim 1, special
Sign is that step 1 detailed process is：
Step 1.1, the electric current for collecting two loop lines simultaneously using combining unitAnd voltage
Step 1.2 is calculated with vectorial jump-value of current
It is each to be respectively with vectorial current-difference sudden-change component：
ΔITAB=| Δ ITA-ΔITB|、ΔITBC=| Δ ITB-ΔITC|、ΔITCA=| Δ ITC-ΔITA|；
Step 1.3 selects Δ ITAB、ΔITBC、ΔITCAThe numerical value of middle minimum, by two bigger numericals respectively with minimum value phase
Than；
If two ratios are not less than 5, which is single-phase fault；
If two ratios are not respectively less than 5, which is not single-phase fault, then needs to judge：
In formula (2), | Δ ITmax|=max { Δ ITAB,ΔITBC,ΔITCA}；
|ΔITmin|=min { Δ ITAB,ΔITBC,ΔITCA}；K1It is adjusted by the maximum scale value occurred when escaping three-phase fault.
3. a kind of parallel double loop road current balance protection method based on same vector current according to claim 2, special
Sign is that Judging fault is mutually single loop line failure in step 2 or cross line fault specific method is：
Whether it is single-phase fault to select failure mutually when step 1, be mutually single loop line failure using contravariant vector current amplitude Judging fault；
If not single loop line failure, then be cross line fault；
It is phase to phase fault or three-phase fault to select failure mutually when step 1, then first with contravariant vector current amplitude principium identification failure
Whether it is mutually single loop line failure；Recycle contravariant vector electric current and same vector current Amplitude Ration subsidiary discriminant failure phase whether be across
Line failure, if not cross line fault, then be single loop line failure.
4. a kind of parallel double loop road current balance protection method based on same vector current according to claim 3, special
Sign is, described to utilize whether contravariant vector current amplitude Judging fault is mutually that single loop line fault method is：
Measure the jump-value of current of a certain phase of I loop linesThe jump-value of current of a certain phase of II loop linesCalculate contravariant vector electricity
Flow Sudden Changing Rate The failure phase selected for step 1；
Contravariant vector jump-value of current threshold value Δ I is setFmin, and compare contravariant vector jump-value of currentIt is prominent with contravariant vector electric current
Variable threshold value Δ IFmin；
IfMore than Δ IFmin, then it is single loop line failure；
IfLess than Δ IFmin, then it is not single loop line failure.
5. a kind of parallel double loop road current balance protection method based on same vector current according to claim 3, special
Sign is, the assistant criteria be made to determine whether be for cross line fault detailed process：JudgeWhether it is less than
IfIt is less thanIt is then cross line fault；
IfIt is not less thanIt is not then cross line fault；
Wherein, σ is determined according to line parameter circuit value.
6. a kind of parallel double loop road current balance protection method based on same vector current according to claim 1, special
Sign is that the amplitude size using phase current of the same name selects fault wire detailed process and is：
Indicate the jump-value of current of a certain phase of I loop lines,Indicate the jump-value of current of a certain phase of II loop lines,
IfBe then I loop lines it is fault wire；
IfBe then II loop lines it is fault wire.
7. a kind of parallel double loop road current balance protection method based on same vector current according to claim 6, special
Sign is, the K2Value is 1.05-1.1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810448045.3A CN108649540B (en) | 2018-05-11 | 2018-05-11 | Current balance protection method for parallel double-circuit line based on currents with same vector |
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|---|---|---|---|
| CN201810448045.3A CN108649540B (en) | 2018-05-11 | 2018-05-11 | Current balance protection method for parallel double-circuit line based on currents with same vector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112255493A (en) * | 2020-09-07 | 2021-01-22 | 西安理工大学 | Multi-criterion comprehensive voting power distribution network fault line selection method |
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