CN103308823B - A kind of power distribution network single-phase disconnection phase to phase fault localization method - Google Patents

A kind of power distribution network single-phase disconnection phase to phase fault localization method Download PDF

Info

Publication number
CN103308823B
CN103308823B CN201310194012.8A CN201310194012A CN103308823B CN 103308823 B CN103308823 B CN 103308823B CN 201310194012 A CN201310194012 A CN 201310194012A CN 103308823 B CN103308823 B CN 103308823B
Authority
CN
China
Prior art keywords
lt
gt
mo
amp
jx
Prior art date
Application number
CN201310194012.8A
Other languages
Chinese (zh)
Other versions
CN103308823A (en
Inventor
贾东梨
盛万兴
宋晓辉
史常凯
李雅洁
张琳
Original Assignee
国家电网公司
中国电力科学研究院
陕西电力科学研究院
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 国家电网公司, 中国电力科学研究院, 陕西电力科学研究院 filed Critical 国家电网公司
Priority to CN201310194012.8A priority Critical patent/CN103308823B/en
Publication of CN103308823A publication Critical patent/CN103308823A/en
Application granted granted Critical
Publication of CN103308823B publication Critical patent/CN103308823B/en

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management
    • Y04S10/522Fault detection or location

Abstract

The present invention relates to a kind of power distribution network single-phase disconnection phase to phase fault localization method, after single-phase wire break phase to phase fault occurs, each substation transformer and non-fault line each substation transformer high-pressure side positive sequence voltage before behind trouble spot, each substation transformer high-pressure side positive sequence voltage is far smaller than trouble spot, and after fault, substation transformer low-pressure side positive sequence voltage also correspondingly can become about 50% of positive sequence voltage before fault.For the three-phase voltage information that the dissimilar measuring equipment being arranged on load point place collects, the positive-sequence component of each load point voltage of real-time calculating, if all load point positive sequence voltages of a certain load point of a certain moment and downstream thereof obviously diminish, and the positive sequence voltage of its upstream load point is constant, then can determine that single-phase wire break phase to phase fault appears in the adjacent lines section, upstream be connected with this load point.The present invention does not need to be equipped with new equipment, and calculates simple, by between localization of fault to two load point, can realize diagnosis and the location of single-phase wire break phase to phase fault.

Description

A kind of power distribution network single-phase disconnection phase to phase fault localization method

Technical field

The present invention relates to Operation Technique of Electric Systems field, be specifically related to a kind of power distribution network single-phase disconnection phase to phase fault localization method.

Background technology

The direct user oriented of power distribution network, broad covered area, running environment is different.Affecting by operational outfit defect, human operational error, outside destroy and meteorological disaster etc., easily there is disconnection fault in especially overhead transmission line.Wherein, the complex grounding fault with interruption can differentiate according to earth fault transient state component and harmonic characteristic etc., and adopts impedance method or traveling wave method etc. to position.For phase to phase fault after broken string, there is no obvious fault signature, location difficulty.

Through finding the retrieval of prior art, technology 1([1] You Yi, Liu Dong, Li Liang, Deng. based on 10kV pole line single-phase wire break phase to phase fault regional determination [J] of load monitor. protecting electrical power system and control .2012, 40 (19): 144-149. [2] Liu Dong, You Yi, topaz brightness, Deng. decision-making system and method thereof based on the single-phase wire break fault zone of load monitor: China, 201110457625.7 [P] .2012-04-18.) propose single-phase wire break phase to phase fault regional determination method based on load monitor, the fault signature that the method adopts is that fault afterload point negative sequence voltage obviously becomes large.Technology 2(Cheng Hao is loyal, Wu Peng, Ma Zhoujun, Deng. the power distribution network single-phase disconnection based on load measuring-recording system judges and addressing method: China, 201210106902.6 [P] .2012-08-15.) propose power distribution network single-phase disconnection fault verification based on load measuring-recording system and addressing method, the voltage that the method arrives according to the load measuring-recording system acquisition being arranged on load point, the voltage of current values and power distribution network single-phase disconnection Mishap Database, current values contrasts, judge disconnection fault type, prospective method or rear pushing manipulation is adopted to carry out single-phase wire break localization of fault, to go forward side by side row relax.Technology 3(Zhu tinkling of pieces of jades; Li Changkai; Zhang Huazhong; Deng. power distribution network single-phase disconnection fault negative sequence current is analyzed and route selection [J]. protecting electrical power system and control; 2009; 37 (9): 35-38.) utilize negative-sequence current and faulted phase voltage product and carry out failure line selection to the method that it carries out forward direction integration, the method can effectively pick out broken string phase to phase fault, but can not carry out localization of fault.

Technology 1 and technology 2 can judge that single-phase wire break is earth-free and simply locate, and need to be equipped with extra measuring equipment, and add investment, installation and maintenance cost, technology 3 can only pick out fault type, can not carry out localization of fault.

Along with the development of intelligent distribution network, power supply enterprise and power consumer are all improving the requirement of power supply quality.This just requires once break down, character, the scope that can occur according to phenomenon of the failure accurately judgement accident, and rational method can be taked to dispose in time, realizes safe and reliable, high-quality and efficient power supply.No matter be overhead transmission line, or cable line, disconnection fault happens occasionally.But for medium voltage distribution network, along the measuring equipment often negligible amounts of feed configuration, therefore, carry out fault diagnosis and location based on it, only can be positioned between certain two measuring equipment, positioning precision is lower.And limited measuring equipment only can measure a certain or certain two alternate value usually, cannot obtain each phase voltage current information, imperfect information carries out fault diagnosis accordingly, likely can cause erroneous judgement or fail to judge.And in power distribution network, load density along feeder line distribution is often greater than measuring equipment density, and due to the generally application of the devices such as Distribution transformer (TTU)/load monitor, each phase voltage current value at load place all can obtain, and the accurate location being disconnection fault provides sufficient data basis.

Summary of the invention

For the deficiencies in the prior art, the object of this invention is to provide a kind of power distribution network single-phase disconnection phase to phase fault localization method, the present invention does not need to be equipped with new equipment, and calculates simple, by between localization of fault to two load point, diagnosis and the location of single-phase wire break phase to phase fault can be realized.

The object of the invention is to adopt following technical proposals to realize:

The invention provides a kind of power distribution network single-phase disconnection phase to phase fault localization method, its improvements are, described method comprises the steps:

(1) distribution network topology is numbered;

(2) positive sequence voltage of fault afterload point is determined;

(3) judge whether positive sequence voltage is less than setting valve (setting valve can be set as 110% of load point positive sequence voltage under non-faulting state): if not, then single-phase wire break phase to phase fault does not occur for load point and supply path thereof; Otherwise, enter step (4);

(4) judge whether the positive sequence voltage of upstream (electric current flows to B load from A load, then A is called the upstream load of B load) the adjacent load of load point is less than setting valve: before if so, continuing, push away the positive sequence voltage determining the adjacent load in upstream, repeat step (4); Otherwise, enter step (5);

(5) determine single-phase wire break phase to phase fault region occurs, export result of calculation.

Preferably, in described step (2), after generation single-phase wire break phase to phase fault, determine the positive sequence voltage of load point high-pressure side and low-pressure side respectively, comprising:

1) determine the on high-tension side positive sequence voltage of load point, comprising:

V 3 ( 1 ) &CenterDot; = ( ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) &CenterDot; E &CenterDot; jX G ( 1 ) - V f ( 1 ) &CenterDot; ) . - - - < 1 > ;

jX LD 3 ( 1 ) ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) + jX LD 3 ( 1 )

V 0 ( 1 ) &CenterDot; &ap; V 1 ( 1 ) &ap; V 2 ( 1 ) &CenterDot; &CenterDot; &ap; V 4 ( 1 ) &CenterDot; &ap; V f ( 1 ) &CenterDot; + V 3 ( 1 ) &CenterDot;

= ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) ( E &CenterDot; &CenterDot; jX LD 3 ( 1 ) + V f ( 1 ) &CenterDot; ) ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) + jX LD 3 ( 1 ) - - - < 2 > ;

Wherein:

---supply voltage;

JX g (1)---power supply positive sequence impedance;

JX l01 (1), jX l12 (1), jX l14 (1)---the positive sequence impedance of branch road 01,12,14;

JX 2f (1), jX f3 (1)---be respectively the circuit positive sequence impedance of node 2 to trouble spot, trouble spot to the positive sequence impedance of node 3;

---trouble spot positive sequence voltage;

JX lD1 (1), jX lD2 (1), jX lD3 (1), jX lD4 (1)---the positive sequence impedance of node 1,2,3,4 connected loads;

---the positive sequence voltage of node i, i=0,1,2,3,4;

JX g (1)//jX lD1 (1)//jX lD2 (1)//jX lD4 (1)---impedance jX g (1), jX lD1 (1), jX lD2 (1), jX lD4 (1)between in parallel;

Known by the boundary condition of single-phase wire break fault:

V f ( 1 ) &CenterDot; = V f ( 2 ) &CenterDot; = V f ( 0 ) = Z &Sigma; 2 / / Z &Sigma; 0 Z &Sigma; 1 + Z &Sigma; 2 / / Z &Sigma; 0 &CenterDot; &CenterDot; E &CenterDot; - - - < 3 > ;

In formula:

Z Σ 1for the positive sequence impedance from breakpoint (breakpoint refers to the position of circuit generation disconnection fault) equivalence, represent by following expression formula:

Z Σ1=jX G(1)//jX LD1(1)//jX LD2(1)//jX LD4(1)+jX LD3(1)<4>;

Z Σ 2for the negative sequence impedance from breakpoint equivalence, represent by following expression formula:

Z Σ2=jX G(2)//jX LD1(2)//jX LD2(2)//jX LD4(2)+jX LD3(2)<5>;

Z Σ 0for the negative sequence impedance from breakpoint equivalence, then:

V 3 ( 1 ) = jX LD 3 ( 1 ) &CenterDot; E &CenterDot; Z &Sigma; 1 jX G ( 1 ) &CenterDot; ( ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) - Z &Sigma; 2 Z &Sigma; 1 + Z &Sigma; 2 jX G ( 1 ) ) = jX LD 3 ( 1 ) &CenterDot; E &CenterDot; ( ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) ( Z &Sigma; 1 + Z &Sigma; 2 ) - Z &Sigma; 2 j X G ( 1 ) ) Z &Sigma; 1 j X G ( 1 ) ( Z &Sigma; 1 + Z &Sigma; 2 ) <6>;

Because:

jX G(1)//jX LD1(1)//jX LD2(1)//jX LD4(1)<jX G(1)<7>;

So:

V 3 ( 1 ) &CenterDot; < jX LD 3 ( 1 ) &CenterDot; E &CenterDot; &CenterDot; Z &Sigma; 1 &CenterDot; ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) Z &Sigma; 1 jX G ( 1 ) ( Z &Sigma; 1 + Z &Sigma; 2 ) - - - < 8 > ;

The voltage of other each node is;

V 0 ( 1 ) &CenterDot; &ap; V 1 ( 1 ) &CenterDot; &ap; V 2 ( 1 ) &CenterDot; &ap; V 4 ( 1 ) &CenterDot; &ap; ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) &CenterDot; E &CenterDot; &CenterDot; ( jX LD 3 ( 1 ) Z &Sigma; 1 + Z &Sigma; 2 jX LD 3 ( 1 ) + Z &Sigma; 2 ) Z &Sigma; 1 ( Z &Sigma; 1 + Z &Sigma; 2 ) = X LD 3 ( 1 ) &CenterDot; Z &Sigma; 1 &CenterDot; E &CenterDot; &CenterDot; ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LdD 4 ( 1 ) ) Z &Sigma; 1 ( Z &Sigma; 1 + Z &Sigma; 2 ) + - - - < 9 > ; ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) &CenterDot; E &CenterDot; ( Z &Sigma; 2 jX LD 3 ( 1 ) + Z &Sigma; 2 ) Z &Sigma; 1 ( Z &Sigma; 1 + Z &Sigma; 2 ) - - - < 9 >

Obtained by formula <8> and <9>:

V 3 ( 1 ) &CenterDot; < V 0 ( 1 ) &CenterDot; &ap; V 1 ( 1 ) &CenterDot; &ap; V 2 ( 1 ) &CenterDot; &ap; V 4 ( 1 ) &CenterDot; - - - < 10 > ;

2) determine the positive sequence voltage of load point low-pressure side, comprise and determine Yyn0 type substation transformer and Dyn11 type substation transformer low-pressure side positive sequence voltage.

More preferably, the positive sequence voltage of YYn0 type substation transformer is determined:

Suppose that A phase breaks, then YYn0 type substation transformer A phase current if then symmetrical component method is used to calculate the three-phase symmetrical component of A, B, C three-phase current:

The positive sequence of A phase current, negative phase-sequence and zero-sequence component are as follows:

In formula: represent the positive sequence of A phase current, negative phase-sequence and zero-sequence component respectively;

represent A, B, C phase current respectively; I represents electric current.

The positive sequence of B phase current, negative phase-sequence and zero-sequence component are as follows:

The positive sequence of C phase current, negative phase-sequence and zero-sequence component are as follows:

Suppose that every phase of impedance is jX, then the positive sequence of A phase voltage, negative phase-sequence and zero-sequence component are as follows:

The positive sequence of B phase voltage, negative phase-sequence and zero-sequence component are as follows:

The positive sequence of C phase voltage, negative phase-sequence and zero-sequence component are as follows:

Described YYn0 type substation transformer low-pressure side positive sequence voltage is identical with high-pressure side phase place with negative sequence voltage, and each order components of low-pressure side a phase voltage is:

In formula: n---substation transformer high-pressure side, low-pressure side no-load voltage ratio;

Yyn0 connects group type substation transformer in A phase broken string situation, and substation transformer low-pressure side a phase positive sequence voltage becomes original doubly.

More preferably, determine Dyn11 type substation transformer low-pressure side positive sequence voltage, comprising:

The each order components of described Dyn11 type substation transformer low-pressure side a phase voltage is:

Dyn11 connects group type substation transformer in A phase broken string situation, and substation transformer low-pressure side a phase positive sequence voltage is original doubly.

More preferably, described load point is divided into high-pressure side to be equipped with load point three class of the load point of intelligent monitoring terminal, the load point of low-pressure side outfit load monitor and low-pressure side outfit Distribution transformer, if when A phase breaks, determine the positive sequence voltage of above-mentioned 3 type load points respectively, comprising:

I, determine that high-pressure side is equipped with the load point positive sequence voltage of intelligent monitoring terminal:

Outfit intelligent monitoring terminal collects on high-tension side three-phase voltage and is respectively then positive sequence voltage modulus value in substation transformer high-pressure side is:

| U A ( 1 ) | = | 1 3 ( U &CenterDot; A + &PartialD; U &CenterDot; B + &PartialD; 2 U C &CenterDot; ) | - - - < 19 > ;

II, determine that low-pressure side is equipped with the load point positive sequence voltage of load monitor:

Load monitor is arranged on substation transformer low-pressure side, three-phase voltage, the three-phase current of distribution low-voltage side is gathered by potential and current transformers, quantize through A/D converter, microprocessor carry out the control of sequential, data store, the realization of communication protocol and the output of data; Load monitor can collect the three-phase voltage phasor of substation transformer low-pressure side, and low-pressure side positive sequence voltage modulus value is:

| U a ( 1 ) | = | 1 3 ( U &CenterDot; a + &PartialD; U &CenterDot; b + &PartialD; 2 U &CenterDot; c ) | - - - < 20 > ;

III, determine that low-pressure side is equipped with the load point positive sequence voltage of distribution transformer monitoring terminal:

Distribution transformer monitoring terminal carries out AC sampling by electric current and voltage transformer (VT) to three-phase voltage and three-phase current, and low-pressure side phase voltage mean value is:

U ave = U a + U b + U c 3 - - - < 21 > ;

The positive-sequence component modulus value of a phase voltage is as follows:

|U a(1)|≈|U ave| <22>;

In formula:

Preferably, in described step (5), determine that power distribution network single-phase disconnection phase to phase fault region comprises: according to the voltage positive-sequence component of each load point calculated, if the positive sequence voltage of this load point and downstream load point thereof becomes original about 50%, and this load point upstream load point positive sequence voltage remains unchanged, then there is single-phase wire break phase to phase fault in the adjacent lines section, upstream be connected with this load point.

Compared with the prior art, the beneficial effect that the present invention reaches is:

(1) the present invention under the condition not increasing measuring equipment, only can realize distribution line single-phase wire break phase to phase fault location according to existing substation transformer measuring equipment, has higher economy and practicality.

(2) the present invention accurately can be positioned to the part of path between two station power distribution transformers, reduces track walker's labour intensity, reduces fault handling time, improves power supply reliability.

(3) the present invention calculates simply, is applicable to most of distribution line, has wide application space.

Accompanying drawing explanation

Fig. 1 is distribution network line schematic diagram provided by the invention;

Fig. 2 is power distribution network positive sequence network figure provided by the invention;

Fig. 3 is the power distribution network positive sequence network figure after abbreviation provided by the invention;

Fig. 4 is Yyn0 type substation transformer winding connection mode figure provided by the invention;

Fig. 5 is Yyn0 type substation transformer high side voltage phasor graph provided by the invention

Fig. 6 is Yyn0 type substation transformer low-pressure side voltage phasor-diagram provided by the invention;

Fig. 7 is Dyn11 type substation transformer winding connection mode figure provided by the invention;

Fig. 8 is Dyn11 type substation transformer high side voltage phasor graph provided by the invention;

Fig. 9 is Dyn11 type substation transformer low-pressure side voltage phasor-diagram provided by the invention;

Figure 10 is power distribution network single-phase disconnection phase to phase fault localization method overview flow chart provided by the invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Power distribution network single-phase disconnection phase to phase fault localization method provided by the invention, after single-phase wire break phase to phase fault occurs, each substation transformer and non-fault line each substation transformer high-pressure side positive sequence voltage before behind trouble spot, each substation transformer high-pressure side positive sequence voltage is far smaller than trouble spot, and after fault, substation transformer low-pressure side positive sequence voltage also correspondingly can become about 50% of positive sequence voltage before fault.The feature of positive sequence voltage change after this patent occurs according to single-phase wire break phase to phase fault, for the three-phase voltage information that the different measuring equipments being arranged on load point high-pressure side or low-pressure side collect, the positive-sequence component of each load point voltage of real-time calculating, if all load point positive sequence voltages of a certain load point of a certain moment and downstream thereof obviously diminish, and the positive sequence voltage of its upstream load point is constant, then can determine that single-phase wire break phase to phase fault appears in the adjacent lines section, upstream be connected with this load point.

Power distribution network single-phase disconnection phase to phase fault localization method overall procedure provided by the invention as shown in Figure 10, comprises the steps:

(1) distribution network topology is numbered;

(2) positive sequence voltage of fault afterload point is determined:

In step (2), after generation single-phase wire break phase to phase fault, determine the positive sequence voltage of load point high-pressure side and low-pressure side respectively, process comprises:

1) determine the on high-tension side positive sequence voltage of load point, comprising:

For the distribution line shown in Fig. 1, set up its positive sequence network figure, as shown in Figure 2, in Fig. 2:

JX g (1)---power supply positive sequence impedance;

JX l01 (1), jX l12 (1), jX l14 (1)---the positive sequence impedance of branch road 01,12,14;

JX 2f (1), jX f3 (1)---be respectively the circuit positive sequence impedance of node 2 to trouble spot, trouble spot to the positive sequence impedance of node 3;

---trouble spot positive sequence voltage;

JX lD1 (1), jX lD2 (1), jX lD3 (1), jX lD4 (1)---the positive sequence impedance of node 1,2,3,4 connected loads;

---the positive sequence voltage of node i, i=0,1,2,3,4;

JX g (1)//jX lD1 (1)//jX lD2 (1)//jX lD4 (1)---impedance jX g (1), jX lD1 (1), jX lD2 (1), jX lD4 (1)between in parallel;

Because branch road each in power distribution network is shorter, and each load positive sequence impedance is comparatively large, and can ignore each branch road positive sequence impedance, the positive sequence network figure after abbreviation as shown in Figure 3.Can be calculated by Fig. 3:

V 3 ( 1 ) &CenterDot; = ( ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) &CenterDot; E &CenterDot; jX G ( 1 ) - V f ( 1 ) &CenterDot; ) . - - - < 1 > ;

jX LD 3 ( 1 ) ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) + jX LD 3 ( 1 )

V 0 ( 1 ) &CenterDot; &ap; V 1 ( 1 ) &ap; V 2 ( 1 ) &CenterDot; &CenterDot; &ap; V 4 ( 1 ) &CenterDot; &ap; V f ( 1 ) &CenterDot; + V 3 ( 1 ) &CenterDot;

= ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) ( E &CenterDot; &CenterDot; jX LD 3 ( 1 ) + V f ( 1 ) &CenterDot; ) ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) + jX LD 3 ( 1 ) - - - < 2 > ;

Known by the boundary condition of single-phase wire break fault:

V f ( 1 ) &CenterDot; = V f ( 2 ) &CenterDot; = V f ( 0 ) = Z &Sigma; 2 / / Z &Sigma; 0 Z &Sigma; 1 + Z &Sigma; 2 / / Z &Sigma; 0 &CenterDot; &CenterDot; E &CenterDot; - - - < 3 > ;

In formula:

Z Σ 1for the positive sequence impedance from breakpoint (breakpoint refers to the position of circuit generation disconnection fault) equivalence, represent by following expression formula:

Z Σ1=jX G(1)//jX LD1(1)//jX LD2(1)//jX LD4(1)+jX LD3(1)<4>;

Z Σ 2for the negative sequence impedance from breakpoint equivalence, represent by following expression formula:

Z Σ2=jX G(2)//jX LD1(2)//jX LD2(2)//jX LD4(2)+jX LD3(2)<5>;

for the negative sequence impedance from breakpoint equivalence, because China's power distribution network mostly is small current neutral grounding system, therefore it is very large, then:

V 3 ( 1 ) = jX LD 3 ( 1 ) &CenterDot; E &CenterDot; Z &Sigma; 1 jX G ( 1 ) &CenterDot; ( ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) - Z &Sigma; 2 Z &Sigma; 1 + Z &Sigma; 2 jX G ( 1 ) ) = jX LD 3 ( 1 ) &CenterDot; E &CenterDot; ( ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) ( Z &Sigma; 1 + Z &Sigma; 2 ) - Z &Sigma; 2 jX G ( 1 ) ) Z &Sigma; 1 jX G ( 1 ) ( Z &Sigma; 1 + Z &Sigma; 2 ) <6>;

Because:

jX G(1)//jX LD1(1)//jX LD2(1)//jX LD4(1)<jX G(1)<7>;

So:

V 3 ( 1 ) &CenterDot; < jX LD 3 ( 1 ) &CenterDot; E &CenterDot; &CenterDot; Z &Sigma; 1 &CenterDot; ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) Z &Sigma; 1 jX G ( 1 ) ( Z &Sigma; 1 + Z &Sigma; 2 ) - - - < 8 > ;

The voltage of other each node is;

V 0 ( 1 ) &CenterDot; &ap; V 1 ( 1 ) &CenterDot; &ap; V 2 ( 1 ) &CenterDot; &ap; V 4 ( 1 ) &CenterDot; &ap; ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) &CenterDot; E &CenterDot; &CenterDot; ( jX LD 3 ( 1 ) Z &Sigma; 1 + Z &Sigma; 2 jX LD 3 ( 1 ) + Z &Sigma; 2 ) Z &Sigma; 1 ( Z &Sigma; 1 + Z &Sigma; 2 ) = X LD 3 ( 1 ) &CenterDot; Z &Sigma; 1 &CenterDot; E &CenterDot; &CenterDot; ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LdD 4 ( 1 ) ) Z &Sigma; 1 ( Z &Sigma; 1 + Z &Sigma; 2 ) + - - - < 9 > ; ( jX G ( 1 ) / / jX LD 1 ( 1 ) / / jX LD 2 ( 1 ) / / jX LD 4 ( 1 ) ) &CenterDot; E &CenterDot; ( Z &Sigma; 2 jX LD 3 ( 1 ) + Z &Sigma; 2 ) Z &Sigma; 1 ( Z &Sigma; 1 + Z &Sigma; 2 )

Obtained by formula <8> and <9>:

V 3 ( 1 ) &CenterDot; < V 0 ( 1 ) &CenterDot; &ap; V 1 ( 1 ) &CenterDot; &ap; V 2 ( 1 ) &CenterDot; &ap; V 4 ( 1 ) &CenterDot; - - - < 10 > ;

That is, after single-phase wire break phase to phase fault occurs, the positive sequence voltage of each point positive sequence voltage each load point and each load point of non-fault line before being less than trouble spot behind trouble spot.

2) determine the positive sequence voltage of load point low-pressure side, in China, substation transformer connects group based on Yyn0, is secondly Dyn11, and the present invention discusses to Yyn0 type substation transformer and the change of Dyn11 type substation transformer low-pressure side positive sequence voltage respectively.

1. the positive sequence voltage of YYn0 type substation transformer is determined:

Yyn0 type substation transformer winding connection mode as shown in Figure 4.Suppose that A phase breaks, then YYn0 type substation transformer A phase current if then symmetrical component method is used to calculate the three-phase symmetrical component of A, B, C three-phase current:

Substation transformer high-pressure side can regard pure inductance as, supposes that every phase of impedance is that the positive sequence of jX, A phase current, negative phase-sequence and zero-sequence component are as follows:

In formula: represent the positive sequence of A phase current, negative phase-sequence and zero-sequence component respectively;

represent A, B, C phase current respectively; I represents electric current

The positive sequence of B phase current, negative phase-sequence and zero-sequence component are as follows:

The positive sequence of C phase current, negative phase-sequence and zero-sequence component are as follows:

Suppose that every phase of impedance is jX, then the positive sequence of A phase voltage, negative phase-sequence and zero-sequence component are as follows:

The positive sequence of B phase voltage, negative phase-sequence and zero-sequence component are as follows:

The positive sequence of C phase voltage, negative phase-sequence and zero-sequence component are as follows:

Each order components of A, B, C three-phase voltage as shown in Figure 5 and Figure 6.

Because YYn0 type substation transformer low-pressure side positive sequence voltage is identical with high-pressure side phase place with negative sequence voltage, each order components of low-pressure side a phase voltage is:

In formula: n---substation transformer high-pressure side, low-pressure side no-load voltage ratio;

Therefore, from above formula, Yyn0 connects group type substation transformer in A phase broken string situation, and substation transformer low-pressure side a phase positive sequence voltage becomes original doubly.

2. determine Dyn11 type substation transformer low-pressure side positive sequence voltage, comprising:

Dyn11 substation transformer winding connection mode as shown in Figure 7.In A phase broken string situation, substation transformer high voltage side current, voltage computing method are with other substation transformer computing method of Yyn0 Connecting groups.

Because it is Dyn11 that substation transformer connects group, residual voltage does not induce residual voltage in low-pressure side; Under positive sequence voltage effect, low-pressure side phase voltage delayed high-pressure side phase voltage 330 °; Under negative sequence voltage effect, low-pressure side phase voltage delayed high-pressure side phase voltage 30 °.The voltage vector diagram of high-pressure side, low-pressure side as shown in Figure 8 and Figure 9.As seen from the figure, each order components of described Dyn11 type substation transformer low-pressure side a phase voltage is:

Dyn11 connects group type substation transformer in A phase broken string situation, and substation transformer low-pressure side a phase positive sequence voltage is original doubly.

According to load point measuring equipment configuring condition calculated load point positive sequence voltage, because China's each department Distribution Network Equipment level is uneven, load point place measure configuration complete degree is also not quite similar.The present invention is according to the actual conditions of China's load point, high-pressure side load point is divided into be equipped with load point three class of the load point of intelligent monitoring terminal, the load point of low-pressure side outfit load monitor and low-pressure side outfit Distribution transformer, if when A phase breaks, determine the positive sequence voltage of above-mentioned 3 type load points respectively, comprising:

I, determine that high-pressure side is equipped with the load point positive sequence voltage of intelligent monitoring terminal:

Substation transformer high-pressure side is equipped with intelligent monitoring terminal, can collect on high-tension side three-phase voltage and be respectively then positive sequence voltage modulus value in substation transformer high-pressure side is:

| U A ( 1 ) | = | 1 3 ( U &CenterDot; A + &PartialD; U &CenterDot; B + &PartialD; 2 U C &CenterDot; ) | - - - < 19 > ;

II, determine that low-pressure side is equipped with the load point positive sequence voltage of load monitor:

Load monitor is arranged on substation transformer low-pressure side, three-phase voltage, the three-phase current of distribution low-voltage side is gathered by potential and current transformers, quantize through A/D converter, microprocessor carry out the control of sequential, data store, the realization of communication protocol and the output of data; Load monitor can collect the three-phase voltage phasor of substation transformer low-pressure side, and low-pressure side positive sequence voltage modulus value is:

| U a ( 1 ) | = | 1 3 ( U &CenterDot; a + &PartialD; U &CenterDot; b + &PartialD; 2 U &CenterDot; c ) | - - - < 20 > ;

III, determine that low-pressure side is equipped with the load point positive sequence voltage of distribution transformer monitoring terminal:

Distribution transformer monitoring terminal (TTU) carries out AC sampling by electric current and voltage transformer (VT) to three-phase voltage and three-phase current, but only collect the three-phase voltage modulus value of substation transformer low-pressure side, phase angle can not be collected, substation transformer low-pressure side positive sequence voltage adopts approximate treatment, and low-pressure side phase voltage mean value is:

U ave = U a + U b + U c 3 - - - < 21 > ;

The positive-sequence component modulus value of a phase voltage is as follows:

|U a(1)|≈|U ave| <22>;

In formula:

(3) judge whether positive sequence voltage is less than setting valve (setting valve can be set as 110% of load point positive sequence voltage under non-faulting state): if not, then single-phase wire break phase to phase fault does not occur for load point and supply path thereof; Otherwise, enter step (4);

(4) judge whether the positive sequence voltage of the adjacent load in the upstream of load point is less than setting valve: before if so, continuing, push away the positive sequence voltage determining the adjacent load in upstream, repeat step (4); Otherwise, enter step (5);

(5) determine single-phase wire break phase to phase fault region occurs, export result of calculation:

According to each load point voltage positive-sequence component calculated, if the positive sequence voltage of this load point and downstream load point thereof obviously diminishes (becoming original about 50%), and this load point upstream load point positive sequence voltage remains unchanged, then there is single-phase wire break phase to phase fault in the adjacent lines section, upstream be connected with this load point.

The invention provides a kind of method that feature utilizing broken string afterload point positive sequence voltage to reduce realizes single-phase wire break phase to phase fault location.The present invention does not need to be equipped with new equipment, and calculates simple, by between localization of fault to two load point, can realize diagnosis and the location of single-phase wire break phase to phase fault.

Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.

Claims (1)

1. a power distribution network single-phase disconnection phase to phase fault localization method, is characterized in that, described method comprises the steps:
(1) distribution network topology is numbered;
(2) positive sequence voltage of fault afterload point is determined;
(3) judge whether positive sequence voltage is less than setting valve: if not, then there is not single-phase wire break phase to phase fault in load point and supply path thereof; Otherwise, enter step (4);
(4) judge whether the positive sequence voltage of the adjacent load in the upstream of load point is less than setting valve: before if so, continuing, push away the positive sequence voltage determining the adjacent load in upstream, repeat step (4); Otherwise, enter step (5);
(5) determine single-phase wire break phase to phase fault region occurs, export result of calculation;
In described step (2), after generation single-phase wire break phase to phase fault, determine the positive sequence voltage of load point high-pressure side and low-pressure side respectively, comprising:
1) determine the on high-tension side positive sequence voltage of load point, comprising:
<math> <mrow> <mover> <msub> <mi>V</mi> <mrow> <mn>3</mn> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>&amp;CenterDot;</mo> </mover> <mo>=</mo> <mrow> <mo>(</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>jX</mi> <mrow> <mi>G</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>/</mo> <mo>/</mo> <msub> <mi>jX</mi> <mrow> <mi>L</mi> <mi>D</mi> <mn>1</mn> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>/</mo> <mo>/</mo> <msub> <mi>jX</mi> <mrow> <mi>L</mi> <mi>D</mi> <mn>2</mn> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>/</mo> <mo>/</mo> <msub> <mi>jX</mi> <mrow> <mi>L</mi> <mi>D</mi> <mn>4</mn> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>)</mo> <mo>&amp;CenterDot;</mo> <mover> <mi>E</mi> <mo>&amp;CenterDot;</mo> </mover> </mrow> <mrow> <msub> <mi>jX</mi> <mrow> <mi>G</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> </mrow> </mfrac> <mo>-</mo> <mover> <msub> <mi>V</mi> <mrow> <mi>f</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>&amp;CenterDot;</mo> </mover> <mo>)</mo> </mrow> <mo>.</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mtext>&lt;1&gt;;</mtext> </mrow></math>
jX L D 3 ( 1 ) ( jX G ( 1 ) / / jX L D 1 ( 1 ) / / jX L D 2 ( 1 ) / / jX L D 4 ( 1 ) ) + jX L D 3 ( 1 )
V 0 ( 1 ) &CenterDot; &ap; V 1 ( 1 ) &CenterDot; &ap; V 2 ( 1 ) &CenterDot; &ap; V 4 ( 1 ) &CenterDot; V f ( 1 ) &CenterDot; + V 3 ( 1 ) &CenterDot; = ( jX G ( 1 ) / / jX L D 1 ( 1 ) / / jX L D 2 ( 1 ) / / jX L D 4 ( 1 ) ) ( E &CenterDot; &CenterDot; jX L D 3 ( 1 ) + V f ( 1 ) &CenterDot; ) ( jX G ( 1 ) / / jX L D 1 ( 1 ) / / jX L D 2 ( 1 ) / / jX L D 4 ( 1 ) ) + jX L D 3 ( 1 ) - - - < 2 > ;
Wherein:
---supply voltage;
JX g (1)---power supply positive sequence impedance;
JX l01 (1), jX l12 (1), jX l14 (1)---the positive sequence impedance of branch road 01,12,14;
JX 2f (1), jX f3 (1)---be respectively the circuit positive sequence impedance of node 2 to trouble spot, trouble spot to the positive sequence impedance of node 3;
---trouble spot positive sequence voltage;
JX lD1 (1), jX lD2 (1), jX lD3 (1), jX lD4 (1)---the positive sequence impedance of node 1,2,3,4 connected loads;
---the positive sequence voltage of node i, i=0,1,2,3,4;
JX g (1)//jX lD1 (1)//jX lD2 (1)//jX lD4 (1)---impedance jX g (1), jX lD1 (1), jX lD2 (1), jX lD4 (1)between in parallel;
Known by the boundary condition of single-phase wire break fault:
V f ( 1 ) &CenterDot; = V f ( 2 ) &CenterDot; = V f ( 0 ) &CenterDot; = Z &Sigma; 2 / / Z &Sigma; 0 Z &Sigma; 1 + Z &Sigma; 2 / / Z &Sigma; 0 . E &CenterDot; - - - < 3 > ;
In formula:
Z Σ 1for the positive sequence impedance from breakpoint equivalence, represent by following expression formula:
Z Σ1=jX G(1)//jX LD1(1)//jX LD2(1)//jX LD4(1)+jX LD3(1)<4>;
Z Σ 2for the negative sequence impedance from breakpoint equivalence, represent by following expression formula:
Z Σ2=jX G(2)//jX LD1(2)//jX LD2(2)//jX LD4(2)+jX LD3(2)<5>;
Z Σ 0for the negative sequence impedance from breakpoint equivalence, Z Σ 2//Z Σ 0≈ Z Σ 2; Then:
V 3 ( 1 ) &CenterDot; = jX L D 3 ( 1 ) &CenterDot; E &CenterDot; Z &Sigma; 1 jX G ( 1 ) ( ( jX G ( 1 ) / / jX L D 1 ( 1 ) / / jX L D 2 ( 1 ) / / jX L D 4 ( 1 ) ) - Z &Sigma; 2 Z &Sigma; 1 + Z &Sigma; 2 jX G ( 1 ) ) = jX L D 3 ( 1 ) &CenterDot; E &CenterDot; ( ( jX G ( 1 ) / / jX L D 1 ( 1 ) / / jX L D 2 ( 1 ) / / jX L D 4 ( 1 ) ) ( Z &Sigma; 1 + Z &Sigma; 2 ) - Z &Sigma; 2 jX G ( 1 ) Z &Sigma; 2 jX G ( 1 ) ( Z &Sigma; 1 + Z &Sigma; 2 ) - - - < 6 > ;
Because:
jX G(1)//jX LD1(1)//jX LD2(1)//jX LD4(1)<jX G(1)<7>;
So:
<math> <mrow> <mover> <msub> <mi>V</mi> <mrow> <mn>3</mn> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>&amp;CenterDot;</mo> </mover> <mo>&lt;</mo> <mfrac> <mrow> <msub> <mi>jX</mi> <mrow> <mi>L</mi> <mi>D</mi> <mn>3</mn> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>&amp;CenterDot;</mo> <mover> <mi>E</mi> <mo>&amp;CenterDot;</mo> </mover> <mo>&amp;CenterDot;</mo> <msub> <mi>Z</mi> <mrow> <mo>&amp;Sigma;</mo> <mn>1</mn> </mrow> </msub> <mo>.</mo> <mrow> <mo>(</mo> <msub> <mi>jX</mi> <mrow> <mi>G</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>/</mo> <mo>/</mo> <msub> <mi>jX</mi> <mrow> <mi>L</mi> <mi>D</mi> <mn>1</mn> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>/</mo> <mo>/</mo> <msub> <mi>jX</mi> <mrow> <mi>L</mi> <mi>D</mi> <mn>2</mn> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>/</mo> <mo>/</mo> <msub> <mi>jX</mi> <mrow> <mi>L</mi> <mi>D</mi> <mn>4</mn> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mo>)</mo> </mrow> </mrow> <mrow> <msub> <mi>Z</mi> <mrow> <mo>&amp;Sigma;</mo> <mn>1</mn> </mrow> </msub> <msub> <mi>jX</mi> <mrow> <mi>G</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </msub> <mrow> <mo>(</mo> <msub> <mi>Z</mi> <mrow> <mo>&amp;Sigma;</mo> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>Z</mi> <mrow> <mo>&amp;Sigma;</mo> <mn>2</mn> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mtext>&lt;8&gt;</mtext> <mo>;</mo> </mrow></math>
The voltage of other each node is;
V 0 ( 1 ) &CenterDot; &ap; V 1 ( 1 ) &CenterDot; &ap; V 2 ( 1 ) &CenterDot; &ap; V 4 ( 1 ) &CenterDot; &ap; ( jX G ( 1 ) / / jX L D 1 ( 1 ) / / jX L D 2 ( 1 ) / / jX L D 4 ( 1 ) ) &CenterDot; E &CenterDot; &CenterDot; ( jX L D 3 ( 1 ) Z &Sigma; 1 + Z &Sigma; 2 jX L D 3 ( 1 ) + Z &Sigma; 2 ) Z &Sigma; 1 ( Z &Sigma; 1 + Z &Sigma; 2 ) = X L D 3 ( 1 ) Z &Sigma; 1 &CenterDot; E &CenterDot; &CenterDot; ( jX G ( 1 ) / / jX L D 1 ( 1 ) / / jX L D 2 ( 1 ) / / jX L D 4 ( 1 ) ) Z &Sigma; 1 ( Z &Sigma; 1 + Z &Sigma; 2 ) + ( jX G ( 1 ) / / jX L D 1 ( 1 ) / / jX L D 2 ( 1 ) / / jX L D 4 ( 1 ) ) &CenterDot; E &CenterDot; ( Z &Sigma; 2 jX L D 3 ( 1 ) + Z &Sigma; 2 ) Z &Sigma; 1 ( Z &Sigma; 1 + Z &Sigma; 2 ) - - - < 9 > ;
Obtained by formula <8> and <9>:
V 3 ( 1 ) &CenterDot; < V 0 ( 1 ) &CenterDot; &ap; V 1 ( 1 ) &CenterDot; &ap; V 2 ( 1 ) &CenterDot; &ap; V 4 ( 1 ) &CenterDot; - - - < 10 > ;
2) determine the positive sequence voltage of load point low-pressure side, comprise and determine Yyn0 type substation transformer and Dyn11 type substation transformer low-pressure side positive sequence voltage;
Determine the positive sequence voltage of YYn0 type substation transformer:
Suppose that A phase breaks, then YYn0 type substation transformer A phase current if then symmetrical component method is used to calculate the three-phase symmetrical component of A, B, C three-phase current:
The positive sequence of A phase current, negative phase-sequence and zero-sequence component are as follows:
In formula: represent the positive sequence of A phase current, negative phase-sequence and zero-sequence component respectively;
represent A, B, C phase current respectively; I represents electric current;
The positive sequence of B phase current, negative phase-sequence and zero-sequence component are as follows:
The positive sequence of C phase current, negative phase-sequence and zero-sequence component are as follows:
Suppose that every phase of impedance is jX, then the positive sequence of A phase voltage, negative phase-sequence and zero-sequence component are as follows:
The positive sequence of B phase voltage, negative phase-sequence and zero-sequence component are as follows:
The positive sequence of C phase voltage, negative phase-sequence and zero-sequence component are as follows:
Described YYn0 type substation transformer low-pressure side positive sequence voltage is identical with high-pressure side phase place with negative sequence voltage, and each order components of low-pressure side a phase voltage is:
In formula: n---substation transformer high-pressure side, low-pressure side no-load voltage ratio;
Yyn0 connects group type substation transformer in A phase broken string situation, and substation transformer low-pressure side a phase positive sequence voltage becomes original doubly;
Determine Dyn11 type substation transformer low-pressure side positive sequence voltage, comprising:
The each order components of described Dyn11 type substation transformer low-pressure side a phase voltage is:
Dyn11 connects group type substation transformer in A phase broken string situation, and substation transformer low-pressure side a phase positive sequence voltage is original doubly;
Described load point is divided into high-pressure side to be equipped with load point three class of the load point of intelligent monitoring terminal, the load point of low-pressure side outfit load monitor and low-pressure side outfit Distribution transformer, if when A phase breaks, determine the positive sequence voltage of above-mentioned 3 type load points respectively, comprising:
I, determine that high-pressure side is equipped with the load point positive sequence voltage of intelligent monitoring terminal:
Outfit intelligent monitoring terminal collects on high-tension side three-phase voltage and is respectively then positive sequence voltage modulus value in substation transformer high-pressure side is:
| U A ( 1 ) | = | 1 3 ( U &CenterDot; A + &part; U &CenterDot; B + &part; 2 U &CenterDot; C ) | - - - < 19 > ;
II, determine that low-pressure side is equipped with the load point positive sequence voltage of load monitor:
Load monitor is arranged on substation transformer low-pressure side, three-phase voltage, the three-phase current of distribution low-voltage side is gathered by potential and current transformers, quantize through A/D converter, microprocessor carry out the control of sequential, data store, the realization of communication protocol and the output of data; Load monitor can collect the three-phase voltage phasor of substation transformer low-pressure side, and low-pressure side positive sequence voltage modulus value is:
| U a ( 1 ) | = | 1 3 ( U &CenterDot; a + &part; U &CenterDot; b + &part; 2 U &CenterDot; c ) | - - - < 20 > ;
III, determine that low-pressure side is equipped with the load point positive sequence voltage of distribution transformer monitoring terminal:
Distribution transformer monitoring terminal carries out AC sampling by electric current and voltage transformer (VT) to three-phase voltage and three-phase current, and low-pressure side phase voltage mean value is:
U a v e = U a + U b + U c 3 - - - < 21 > ;
The positive-sequence component modulus value of a phase voltage is as follows:
|U a(1)|≈|U ave|<22>;
In formula:
In described step (5), determine that power distribution network single-phase disconnection phase to phase fault region comprises: according to the voltage positive-sequence component of each load point calculated, if the positive sequence voltage of this load point and downstream load point thereof becomes original about 50%, and this load point upstream load point positive sequence voltage remains unchanged, then there is single-phase wire break phase to phase fault in the adjacent lines section, upstream be connected with this load point.
CN201310194012.8A 2013-05-23 2013-05-23 A kind of power distribution network single-phase disconnection phase to phase fault localization method CN103308823B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310194012.8A CN103308823B (en) 2013-05-23 2013-05-23 A kind of power distribution network single-phase disconnection phase to phase fault localization method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310194012.8A CN103308823B (en) 2013-05-23 2013-05-23 A kind of power distribution network single-phase disconnection phase to phase fault localization method

Publications (2)

Publication Number Publication Date
CN103308823A CN103308823A (en) 2013-09-18
CN103308823B true CN103308823B (en) 2015-11-04

Family

ID=49134254

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310194012.8A CN103308823B (en) 2013-05-23 2013-05-23 A kind of power distribution network single-phase disconnection phase to phase fault localization method

Country Status (1)

Country Link
CN (1) CN103308823B (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10365313B2 (en) 2014-07-17 2019-07-30 Siemens Aktiengesellschaft Broken conductor detection method and apparatus
CN104730410B (en) * 2015-03-16 2017-11-21 王金泽 A kind of distribution line disconnection monitoring method and device based on voltage x current vector
CN104965151B (en) * 2015-05-28 2017-12-29 国家电网公司 A kind of fault distance-finding method based on fault point voltage Sudden Changing Rate
CN105572535B (en) * 2015-12-30 2018-09-11 北京天诚同创电气有限公司 Monitoring method, monitoring device and the monitoring system of step-up transformer
CN106154115A (en) * 2016-06-16 2016-11-23 上海交通大学 Distributed feed line automatization terminal and distribution line failure judgement system, method
CN106291221B (en) * 2016-10-20 2018-12-21 南京南瑞继保电气有限公司 A kind of same tower double back transmission line adjacent lines broken string recognition methods
CN106771804B (en) * 2016-12-08 2018-11-23 南京南瑞继保电气有限公司 A kind of transmission line of electricity broken string area judging method based on zero-sequence network
CN106646123B (en) * 2016-12-08 2018-11-23 南京南瑞继保电气有限公司 A kind of transmission line of electricity broken string area judging method of relatively residual voltage
CN106501661A (en) * 2016-12-08 2017-03-15 南京南瑞继保电气有限公司 A kind of transmission line of electricity broken string area judging method based on signal transmission
CN107015114A (en) * 2017-04-11 2017-08-04 国网河南省电力公司电力科学研究院 The broken string recognition methods compared based on non-faulting phase current correlation
CN106997019A (en) * 2017-05-17 2017-08-01 国家电网公司 A kind of monitoring method for earth-free power system single-phase wire break
CN107748315B (en) * 2017-09-14 2019-09-27 国家电网公司 A kind of Distribution Network Failure active forewarning method
CN108054739B (en) * 2017-12-18 2019-05-28 广东电网有限责任公司珠海供电局 A kind of overhead transmission line feeder automation method and system based on negative-sequence current
CN108181553A (en) * 2018-01-23 2018-06-19 中国石油大学(华东) A kind of small current neutral grounding system single-phase wire break fault section location method based on line voltage variation characteristic
CN108226712B (en) * 2018-01-24 2020-03-24 国网江苏省电力有限公司苏州供电分公司 Fault processing method for power distribution network
CN108776283B (en) * 2018-04-04 2020-06-05 国家电网公司 Power distribution network single-phase disconnection fault judgment method and system under incomplete CT configuration
CN108802565A (en) * 2018-04-28 2018-11-13 国网上海市电力公司 A kind of medium voltage distribution network broken string phase to phase fault detection method based on machine learning

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6358272A (en) * 1986-08-29 1988-03-14 Railway Technical Res Inst Ground fault locating method for three-phase high-voltage power distribution line
CN1793995A (en) * 2006-03-09 2006-06-28 保定浪拜迪电气股份有限公司 Measuring method of power transmission line failure distance
CN1916651A (en) * 2005-06-29 2007-02-21 Abb有限公司 Method and system for determining location of phase-to-earth fault
CN102419408A (en) * 2011-12-31 2012-04-18 上海交通大学 System and method for determining single-phase disconnection fault sections based on load monitors
CN102636731A (en) * 2012-04-12 2012-08-15 上海交通大学 Power distribution network single-phase disconnection judging and addressing method based on load measuring and recording system
CN102707194A (en) * 2012-05-17 2012-10-03 中国电力科学研究院 Power distribution network broken line fault location method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6358272A (en) * 1986-08-29 1988-03-14 Railway Technical Res Inst Ground fault locating method for three-phase high-voltage power distribution line
CN1916651A (en) * 2005-06-29 2007-02-21 Abb有限公司 Method and system for determining location of phase-to-earth fault
CN1793995A (en) * 2006-03-09 2006-06-28 保定浪拜迪电气股份有限公司 Measuring method of power transmission line failure distance
CN102419408A (en) * 2011-12-31 2012-04-18 上海交通大学 System and method for determining single-phase disconnection fault sections based on load monitors
CN102636731A (en) * 2012-04-12 2012-08-15 上海交通大学 Power distribution network single-phase disconnection judging and addressing method based on load measuring and recording system
CN102707194A (en) * 2012-05-17 2012-10-03 中国电力科学研究院 Power distribution network broken line fault location method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
基于小波神经网络单相断线故障选线和定位;朱玲玲等;《电力系统保护与控制》;20110216;第39卷(第4期);第12-17页 *
基于负荷监测仪的10 kV架空线单相断线不接地故障区域判定;尤毅等;《电力系统保护与控制》;20121001;第40卷(第19期);第145页第1.2节至第146页第2节 *

Also Published As

Publication number Publication date
CN103308823A (en) 2013-09-18

Similar Documents

Publication Publication Date Title
Monadi et al. Protection of AC and DC distribution systems Embedding distributed energy resources: A comparative review and analysis
CN104218563B (en) The distribution network failure arc extinguishing method that a kind of neutral point is grounded through Multilevel Inverters
Ma et al. A fault steady state component-based wide area backup protection algorithm
CN103490394B (en) The motor synchronizing positive sequence fault component current differential protection method of active power distribution network
CN102253315B (en) Based on the Fault Locating Method of single end distance measurement
CN103675605B (en) A kind of power distribution network earth fault line selection method based on the correlation analysis of fault-signal transient state
CN104101812B (en) Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network
CN103018627B (en) Adaptive fault type fault line detection method for non-effectively earthed system
CN103630814B (en) High tension cable is at cross interconnected lower insulation dielectric loss angle trend on-line monitoring method
CN1333503C (en) Protection and fault positioning method for generator stator winding single-phase earthing
CN102608495B (en) Fault phase selection method based on current break variable
CN103094905B (en) Selection method of dynamic reactive power compensation configuration point
CN103293443B (en) A kind of distribution network overhead line Earth design method
CN100386637C (en) Fault line selection method for single-phase-to-ground fault in small ground current distribution network
CN103023149A (en) Intelligent power distribution terminal and intelligent power distribution system based on IEC61850
CN102944814A (en) Power distribution network single-phase earth fault locating method based on transient state
CN102645613B (en) Transmission line malfunction positioning method based on non-contact magnetic measurement
CN103592573B (en) Residing for subregion, up-downgoing Traction networks is not in the fault distance-finding method of parallel connection
CN101598761A (en) Fault line selection method for small electric current grounding system of distribution network
CN105572553B (en) The on-line testing method of single-core high-voltage cable outer jacket insulation and cross interconnected wiring
CN104297632B (en) Method for detecting grid fault online under condition of limited number of PMUs based on least square method
CN102611080B (en) Main station type small current grounding control method
CN102565626A (en) On-line positioning method and system of section with low-current ground faults
CN102768324B (en) Single-phase ground fault section positioning method for low-current grounding system
CN203870191U (en) Low-voltage line fault locating terminal of power distribution area

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model