CN102914726A - Fault positioning method for common-tower double-circuit line - Google Patents
Fault positioning method for common-tower double-circuit line Download PDFInfo
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- CN102914726A CN102914726A CN2012104407215A CN201210440721A CN102914726A CN 102914726 A CN102914726 A CN 102914726A CN 2012104407215 A CN2012104407215 A CN 2012104407215A CN 201210440721 A CN201210440721 A CN 201210440721A CN 102914726 A CN102914726 A CN 102914726A
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Abstract
A fault positioning method for a common-tower double-circuit line comprises the following steps: firstly, carrying out six-sequence decomposition for electrical quantity at two ends of the double-circuit line; next, calculating the fault distance by a long line equation of a transmission line of a same positive-sequence fault component of the six-sequence components, and obtaining six-sequence current of a fault point according to the electrical quantity at two ends of the double-circuit line, the fault distance and the long line equation; then converting the six-sequence current into six-phase current; and finally, judging a fault phase according to the amplitude value characteristic of the phase current of the fault point. According to the method provided by the invention, when fault phase-selection of the double-circuit line is carried out, the fault distance detection can be performed at the same time, and the advantages of clear principle, high distance detection accuracy, simple and reliable phase-selection logic and the like are provided. The method provided by the invention is free of the influence of fault point transitional resistance, circuit distributed capacitor current and load current, can automatically adapt to and regulate a definite value of the phase-selection criterion with the change of a system operation manner, and can provide effective phase-selection logic for distance protection of the common-tower double-circuit line.
Description
Technical field
The present invention relates to a kind of range finding and phase-selecting method of transmission line malfunction, belong to the power transmission and distribution technical field.
Background technology
Along with the development of modern electric technology and the continuous increase of net capacity, power transmission line corridor is more and more nervous, and particularly this problem is particularly outstanding in big and medium-sized cities.Double-circuit lines on the same pole is because two loop line roads share a shaft tower, has a required transmission line corridor narrow, takies the characteristics such as the good farmland is few, construction speed fast, remarkable in economical benefits, widely applies in actual motion and planning construction.
The double-circuit line method of operation is complicated, have mutual inductance and cross line fault between line, brings mutually certain difficulty for the fault localization of six line transmission systems and choosing.And be to guarantee uninterrupted power supply and few power failure the as far as possible, require double-circuit line when breaking down, only to excise fault phase and keep healthy phases and continue operation, therefore double-circuit line has proposed the strict demand of selecting properly fault phase and fault wire to relay protection.
Phase-selecting method commonly used mainly contains two classes, i.e. Sudden Changing Rate choosing reaches mutually stable state fault amount and selects phase.Phase differential current Sudden Changing Rate class selects the phase method to be widely used in the modern protection; it comes the failure judgement type by the sudden change value that compares three phase differential current faults front and back; these class methods are not subjected to the impact of load current; sensitivity is swift in motion; the general phase of selecting that is used for the fault initial stage, shortcoming are that sensitivity is not enough when detecting terminal long transmission line singlephase earth fault with transition resistance.In addition, need to consider the variation of double-circuit line on same pole healthy phases electric current when this class phase-selecting method is used for double-circuit line on same pole, therefore be still waiting further research.Stable state fault amount class phase-selecting method comprises that mainly impedance selects the phase method, and voltage selects the phase method, and the order electric current selects Xiang Fa etc.Impedance selects the measurement result of phase method Main Basis impedance measurement element to confirm fault phase, energy selecting properly fault phase under most of simple faults, but it is subjected to the impact of system operation mode, trouble spot transition resistance larger, selects the phase result often undesirable.Voltage selects the phase method need to solve long transmission line at a distance fault and the sensitivity problem during at a distance with transition resistance earth fault, and it can't distinguish interior phase-to phase fault or cross line fault when being used for the double-circuit line on same pole system.The phase method of selecting the zero sequence negative-sequence current adopts the facies principle that selects of fault current sequence component relative phase relation; described method is less and be not subjected to that load current affects etc. advantage is used widely because having the impact that is subjected to fault resistance, and the consequent malfunction that is usually used in protecting is selected phase.Along with the new mathematical tool such as wavelet theory and the birth of signal analysis theory, many scholars are to selecting the phase new principle to carry out large quantity research, and these select the phase new principle a bit to be in theoretical research stage, and some is being tested, and also has with a certain distance from practicality.In a word, existing phase-selecting method respectively has advantage, but selects in the application of phase at double-circuit line on same pole, all has some problems.
Summary of the invention
The object of the invention is to the drawback for prior art, a kind of Fault Locating Method for the double-circuit line on same pole road is provided, effectively select phase logic for the distance protection of double-circuit line on same pole provides.
Problem of the present invention realizes with following technical proposals:
A kind of Fault Locating Method for the double-circuit line on same pole road, described method is at first carried out double-circuit line two ends electric parameters (voltage, the magnitude of current) six orders and is decomposed, then utilize that the transmission line long-line equation with positive sequence fault component calculates fault distance in the six order components, recycling double loop two ends electric parameters, fault distance and long-line equation are tried to achieve six order electric currents of trouble spot, six order electric currents are converted into six phase currents, last amplitude Characteristics failure judgement phase according to the trouble spot phase current.
Above-mentioned Fault Locating Method for the double-circuit line on same pole road, described method is processed according to the following steps:
A. utilize Metzler matrix that following formula provides that double loop both end voltage amount, the magnitude of current are carried out respectively six orders and decompose, two three-phase inversion of double loop are become six independent order components: same positive sequence
, same negative phase-sequence
, same zero sequence
Anyway order
, anti-negative phase-sequence
, anti-zero sequence
,
；
Wherein,
B. adopt with positive sequence fault component transmission line long-line equation and carry out fault localization, the range finding equation is:
，
In the formula,
With
Be respectively the same positive sequence fault component voltage and current of double loop two ends (M end and N end);
Same positive sequence wave impedance for circuit;
For circuit with the positive sequence propagation constant;
Be the same positive sequence impedance of circuit unit length;
For the circuit unit length with the positive sequence admittance;
Be double loop length,
For holding distance to M in the trouble spot;
C. will
The substitution following formula calculates respectively trouble spot six order electric currents:
In the formula,
With
Be respectively i sequence voltage component and the i order current component of double loop two ends (M end and N end);
I order wave impedance for circuit;
Be circuit i order propagation constant;
Be the impedance of circuit unit length i order;
Be the admittance of circuit unit length i order;
D. utilize following formula trouble spot six order electric currents to be converted into six phase currents of double line down point:
In the formula:
,
,
Be six order electric currents of trouble spot,
Six phase currents for the trouble spot;
E. utilize the size of each phase current of trouble spot to distinguish fault separate:
Set a relay protection action current threshold value
If the phase current of trouble spot is worth greater than this, then this is judged to fault phase mutually, otherwise then is judged to healthy phases.
Above-mentioned Fault Locating Method for the double-circuit line on same pole road, the relay protection action current threshold value of differentiation fault phase
Determined by following formula:
，
，
Wherein
Get the higher value of M, protection installation place, N both sides i phase current, k is safety factor, and k equals 0.5.
The present invention can carry out fault localization in the double-circuit line Fault Phase Selection; have that principle is clear, distance accuracy is high, select the advantages such as phase logic is simple and reliable; described method is not subjected to the trouble spot transition resistance; the impact of line distribution capacitance electric current and load current; and can select along with the variation self-adaptation adjustment of system operation mode the definite value of phase criterion, can provide for the distance protection of double-circuit line on same pole and effectively select phase logic.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the schematic diagram of a uniform transmission line;
Fig. 2 is the double-circuit line on same pole system that simulation calculation adopts;
Fig. 3 holds the 100km IBCIIC of place through 300 apart from M among Fig. 2
Simulation result during earth fault;
Fig. 4 is Hebei province city part electric network wiring scheme;
Fig. 5 is transformer station 2 among Fig. 4,3, in when, apart from transformer station's 2 end 69.6kM places double-circuit lines the IAIIAG fault occuring, the fault waveform figure that the RCS-931BM protective device obtains;
Fig. 6 selects the phase result;
Fig. 7 selects the phase process flow diagram.
Each symbol inventory is in the literary composition:
Be same positive-sequence component;
Be same negative sequence component;
Be same zero-sequence component;
Be order component anyway;
Be anti-negative sequence component;
Be anti-zero-sequence component;
With
Be respectively the same positive sequence fault component voltage and current of double loop two ends (M end and N end);
Same positive sequence wave impedance for circuit;
For circuit with the positive sequence propagation constant;
Be the same positive sequence impedance of circuit unit length;
For the circuit unit length with the positive sequence admittance;
Be double loop length;
For holding distance to M in the trouble spot;
With
Be respectively i sequence voltage component and the i order current component of double loop two ends (being M end and N end);
I order wave impedance for circuit;
Be circuit i order propagation constant;
Be the impedance of circuit unit length i order;
Be the admittance of circuit unit length i order;
Be trouble spot six order electric currents;
Be trouble spot six phase currents;
Be relay protection action current threshold value;
Higher value for M, protection installation place, N both sides i phase current; K is safety factor.
Embodiment
Calculate and derive:
1. utilize six order component methods and transmission line long-line equation to ask for fault distance and current in the fault point
As shown in Figure 1, on the circuit apart from the M side
The place, apart from the N side
The voltage, electric current at place can be respectively be expressed as (1) formula and (2) formula with the voltage and current of M, N both sides with long-line equation.
（1）
（2）
In the following formula,
With
,
With
Be respectively the voltage and current of M side and N side protection installation place;
,
Be fault point voltage, electric current;
,
The electric current that comes from M side and N effluent respectively for the trouble spot;
Be the transmission line of electricity total length;
Be propagation constant,
Be characteristic impedance, R, L, G and C are respectively resistance, inductance, the electricity of circuit unit length and lead and electric capacity.
The total current of trouble spot is:
With in formula (1) and the formula (2)
Simultaneous can get:
Will
With
Bring following formula into:
Formula (3) shows, utilizes transmission line two ends electric parameters to find the solution fault distance
Precondition be: must know fault phase.Therefore, in the situation that the separate the unknown of fault find the solution
Infeasible.And have mutual inductance between the analyses for double circuits on same tower, thereby also be unsuitable for directly using above-mentioned algorithm.
For this reason, utilizing six order component methods will have each other the double loop two ends electric parameters of coupled relation to carry out six orders decomposes.Described method becomes six independent order components by Metzler matrix with two three-phase inversion of double loop: same positive sequence
, same negative phase-sequence
, same zero sequence
Anyway order
, anti-negative phase-sequence
, anti-zero sequence
Each order in the six order components satisfies the long-line equation of transmission line equally.
Consider when various types of fault occurs double loop and all contain with the positive sequence amount
Therefore, can utilize
The long-line equation of component is tried to achieve
Value.But, only there is same positive-sequence component in the double loop during owing to normal operation, therefore utilization is tried to achieve with positive sequence
Value will be subjected to the impact of load current.For eliminating its impact, adopt the fault component with positive sequence to carry out fault localization.At this moment, the range finding equation is:
In the formula,
With
Be respectively the same positive sequence fault component voltage and current of M end and N end;
Same positive sequence wave impedance for circuit;
For circuit with the positive sequence propagation constant;
Be the same positive sequence impedance of circuit unit length;
For the circuit unit length with the positive sequence admittance.
Try to achieve fault distance
After, it is worth generation to formula (5), obtain respectively trouble spot six order electric currents:
（5）
In the formula,
With
Be respectively i sequence voltage component and the i order current component of double loop two ends (M end and N end);
I order wave impedance for circuit;
Be circuit i order propagation constant;
Be the impedance of circuit unit length i order;
Be the admittance of circuit unit length i order.
By formula (6) double line down is put six phase currents that six order electric currents are converted into the trouble spot again.
In the formula:
,
,
Be six order electric currents of trouble spot,
Six phase currents for the trouble spot.
2. utilize the phase current feature of trouble spot to realize selecting phase
After trying to achieve each phase current of trouble spot, utilize the amplitude size of each phase current of trouble spot to distinguish fault separate.The current in the fault point of healthy phases is zero, and the current in the fault point of fault phase is larger, for the phasor of M, N both sides short-circuit current and.Set an action current threshold value
If the phase current of trouble spot is worth greater than this, then this is judged to fault phase mutually, otherwise then is judged to healthy phases.Criterion is as follows:
Simulation example:
Double-circuit line on same pole shown in Figure 2 system is carried out emulation.System voltage 500KV, M side system capacity 2000MVA, N side system capacity 1000MVA, the both sides power supply is arranged the angle and is
The every cycle of system 24 points of sampling, simulation run break down during to 0.1s.
Suppose that double loop breaks down apart from the K point at M end 100Km place, the double loop two ends that then emulation obtained (M end, N end) voltage, the magnitude of current carry out respectively six orders and decompose, and obtain the same positive sequence fault component of both end voltage, electric current
With
Its value substitution following formula just can be obtained fault distance.
Table 1 has provided the range finding result under M end 100km place, the different faults type cases.
Range finding result under the table 1 different faults type cases
As shown in Table 1, the double-circuit line on same pole utilization has very high distance accuracy with the long-line equation telemetry of positive sequence fault component.
Suppose IBCIIC to occur through 300 apart from M end 100km place
Transition resistance earth fault, as shown in Table 1, the result that finds range this moment is
, in its value substitution formula (5) corresponding trouble spot six order current equations, try to achieve trouble spot six order electric currents, after trouble spot six order electric currents are converted into six phase currents of trouble spot.Respectively with six phase currents and action current threshold value
Make comparisons, obtain fault separate.Fig. 3 has provided apart from the M end 100km IBCIIC of place through 300
Select the phase result during earth fault.Dotted line is the electric current threshold value among the figure, and solid line is each phase current magnitude of trouble spot.As shown in Figure 3, fault phase is IB, IC, IIC, and namely the C of the B phase of I loop line, C phase and II loop line mutually.Other kinds type Fault Phase Selection result is all correct.
Fig. 4 is Hebei province city part electric network wiring scheme.Transformer station 1 is connected by double loop for the 220kV station in turn for 500kV station, transformer station 2 and transformer station 3.Transformer station 2,3 equal total length 84.069kM of two loop lines, the leader cable model is LGJQ-2
240.Fig. 5 is transformer station 2,3, in when, apart from transformer station's 2 end 69.6kM places double-circuit lines the IAIIAG fault occuring, the fault waveform figure that the RCS-931BM protective device obtains.
With above-mentioned physical fault recorder data criterion that substitution is carried, recording the trouble spot is 69.3kM to the fault distance of transformer station 2, and distance accuracy is 99.57%.Fig. 6 is for selecting the phase result, and dotted line is the electric current threshold value among the figure, and solid line is each phase current magnitude of trouble spot.Known by Fig. 6, the phase result that selects of this criterion is that IA, IIA are fault phase, and IB, IC, IIB and IIC are healthy phases.
Claims (3)
1. a Fault Locating Method that is used for the double-circuit line on same pole road is characterized in that, described method is at first carried out double-circuit line two ends electric parameters the decomposition of six orders, and described electric parameters is voltage and the magnitude of current; Then utilize that the transmission line long-line equation with positive sequence fault component calculates fault distance in the six order components, recycling double loop two ends electric parameters, fault distance and long-line equation are tried to achieve six order electric currents of trouble spot, six order electric currents are converted into six phase currents, last amplitude Characteristics failure judgement phase according to the trouble spot phase current.
2. a kind of Fault Locating Method for the double-circuit line on same pole road according to claim 1 is characterized in that, described method is processed according to the following steps:
A. utilize Metzler matrix that following formula provides that double loop both end voltage amount, the magnitude of current are carried out respectively six orders and decompose, two three-phase inversion of double loop are become six independent order components: same positive sequence
, same negative phase-sequence
, same zero sequence
Anyway order
, anti-negative phase-sequence
, anti-zero sequence
,
Wherein,
B. adopt with positive sequence fault component transmission line long-line equation and carry out fault localization, the range finding equation is:
，
In the formula,
With
Be respectively the same positive sequence fault component voltage and current of double loop two ends M end and N end;
Same positive sequence wave impedance for circuit;
For circuit with the positive sequence propagation constant;
Be the same positive sequence impedance of circuit unit length;
For the circuit unit length with the positive sequence admittance;
Be double loop length,
For holding distance to M in the trouble spot;
C. will
The substitution following formula calculates respectively trouble spot six order electric currents:
，
In the formula,
With
Being respectively the double loop two ends is i sequence voltage component and each order current component of M end and N end;
I order wave impedance for circuit;
Be circuit i order propagation constant;
Be the impedance of circuit unit length i order;
Be the admittance of circuit unit length i order;
D. utilize following formula trouble spot six order electric currents to be converted into six phase currents of double line down point:
In the formula:
,
,
For the trouble spot gets six order electric currents,
Six phase currents for the trouble spot;
E. utilize the size of each phase current of trouble spot to distinguish fault separate:
Set a relay protection action current threshold value
If the phase current of trouble spot is worth greater than this, then this is judged to fault phase mutually, otherwise then is judged to healthy phases.
3. a kind of Fault Locating Method for the double-circuit line on same pole road according to claim 2 is characterized in that, distinguishes the threshold value of the relay protection action current of fault phase
Determined by following formula:
，
，
Wherein
Get the higher value of M, protection installation place, N both sides i phase current, k is safety factor, and k equals 0.5.
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| CN103760407A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Voltage amplitude and phase angle measuring method for double-circuit line non-same-name-phase overline grounded fault point |
| CN103869221A (en) * | 2014-02-21 | 2014-06-18 | 国家电网公司 | SV network sampling-based double-circuit line single-phase earth fault distance measurement method |
| CN103954885A (en) * | 2014-05-20 | 2014-07-30 | 华北电力大学 | Double-circuit fault single-ended positioning system and positioning method based on distribution parameters |
| CN103983897A (en) * | 2014-04-25 | 2014-08-13 | 西安交通大学 | Method for distinguishing fault types of non-transposition same-tower double-circuit line |
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| CN106814282A (en) * | 2015-11-27 | 2017-06-09 | 中国电力科学研究院 | A kind of double-circuit line on same pole phase-selecting method |
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| CN106814282B (en) * | 2015-11-27 | 2020-01-17 | 中国电力科学研究院 | Phase selection method for double circuit lines on same pole |
| CN107026430A (en) * | 2016-01-29 | 2017-08-08 | 中国电力科学研究院 | A kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate |
| CN107026430B (en) * | 2016-01-29 | 2019-11-08 | 中国电力科学研究院 | A kind of double-circuit line on same pole phase-selecting method based on single-ended Sudden Changing Rate |
| CN105738769A (en) * | 2016-03-31 | 2016-07-06 | 山东大学 | Series-compensation double-circuit line fault locating method based on distributed parameter model |
| CN105738769B (en) * | 2016-03-31 | 2018-10-09 | 山东大学 | Series compensation double line down localization method based on distributed parameter model |
| CN106124927A (en) * | 2016-06-20 | 2016-11-16 | 山东大学 | The asynchronous fault distance-finding method of double-circuit lines on the same pole containing series compensation |
| CN107015115A (en) * | 2017-04-13 | 2017-08-04 | 南京电力工程设计有限公司 | A kind of fault distance-finding method of same tower double back transmission line |
| CN107015115B (en) * | 2017-04-13 | 2020-02-21 | 南京电力工程设计有限公司 | Fault location method for double-circuit transmission line on same tower |
| CN107271842A (en) * | 2017-06-05 | 2017-10-20 | 天津大学 | A kind of parallel erected on same tower double-circuit line Fault Locating Method based on positive-sequence component in the same direction |
| CN107271842B (en) * | 2017-06-05 | 2019-12-10 | 天津大学 | same-tower parallel-frame double-circuit line fault positioning method based on same-direction positive sequence component |
| CN108828407A (en) * | 2018-06-29 | 2018-11-16 | 国网江苏省电力有限公司无锡供电分公司 | Double circuits on same tower mixed power transmission line fault locating method |
| CN108828407B (en) * | 2018-06-29 | 2020-10-23 | 国网江苏省电力有限公司无锡供电分公司 | Fault positioning method for double-circuit mixed transmission line on same pole |
| CN109655710A (en) * | 2018-12-03 | 2019-04-19 | 国网江苏省电力有限公司检修分公司 | Double circuits on same tower transmission line of electricity both ends measure the bearing calibration of phasor, apparatus and system |
| CN109655710B (en) * | 2018-12-03 | 2020-12-01 | 国网江苏省电力有限公司检修分公司 | Correction method, device and system for phasor measurement at two ends of same-pole double-circuit transmission line |
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