CN103116116B - The method of discrimination of cross line fault character, device and a kind of reclosing method, system - Google Patents

Abstract

The present invention discloses a kind of method of discrimination with shunt reactor double-circuit line on same pole cross line fault character and device.Described method comprises: the voltage U gathering the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj; According to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t); Calculate described fault phase β mode voltage U _βthe free frequency component amplitude u of (t) ₁; Calculate setting valve U _dz; Judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, if so, then faulty line is transient fault; If not, then faulty line is permanent fault.Adopt method of discrimination and the device of band shunt reactor double-circuit line on same pole cross line fault character of the present invention, the double-circuit line on same pole cross line fault character being with shunt reactor can be judged.

Description

The method of discrimination of cross line fault character, device and a kind of reclosing method, system

Technical field

The present invention relates to technical field of power systems, particularly relate to a kind of method of discrimination with shunt reactor double-circuit line on same pole cross line fault character and device.

Background technology

Double-circuit line on same pole has the advantages such as transmission line corridor is narrow, transmission capacity large, can improve power supply reliability, operation maintenance is simple due to its transmission line of electricity, obtains and apply more and more widely in electric system.Cause permanent fault in order to avoid coinciding with heterogeneous cross-line, in current double-circuit line on same pole, the single loop wire single-phase ground fault character method of discrimination of main employing judges cross line fault character in conjunction with the mode of reclosing according to phase order lock.

In the double-circuit line on same pole of band shunt reactor, because shunt reactor can compensate the capacity current of transmission line of electricity, improve power factor, suppress too high power-frequency overvoltage and excess current, therefore, apply more extensive.But, in the double-circuit line on same pole of band shunt reactor, because under the earth-free different faults character of cross-line, fault terminal voltage all exists " beat frequency " phenomenon, now, circuit disconnects mutually or does not disconnect the superpotential often occurring exceeding permissible value mutually, makes the singlephase earth fault character method of discrimination of single loop line cannot failure judgement character.From the above, the employing list loop wire single-phase ground fault character method of discrimination in currently available technology, in conjunction with the mode of reclosing according to phase order lock, cannot judge the double-circuit line on same pole cross line fault character being with shunt reactor.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of method of discrimination with shunt reactor double-circuit line on same pole cross line fault character and device, in order to solve in prior art, adopt single loop wire single-phase ground fault character method of discrimination in conjunction with the mode of reclosing according to phase order lock, the defect of the double-circuit line on same pole cross line fault character being with shunt reactor cannot be judged.

For achieving the above object, the invention provides following technical scheme:

With a method of discrimination for shunt reactor double-circuit line on same pole cross line fault character, comprising:

Gather the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj, wherein, 1≤i≤3,1≤j≤3, i, j are respectively integer, and i represents the first loop line i-th phase, and j represents the second loop line jth phase;

According to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Calculate described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Calculate setting valve U _dz;

Judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, if so, then faulty line is transient fault; If not, then faulty line is permanent fault.

With a discriminating gear for shunt reactor double-circuit line on same pole cross line fault character, comprising:

Acquisition module, for gathering the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj;

Fault phase β mode voltage computing module, for the voltage U according to described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Free frequency component amplitude computing module, for calculating described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Setting valve computing module, for calculating setting valve U _dz;

Judgement of failure module, for judging described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, if so, then faulty line is transient fault; If not, then faulty line is permanent fault.

Optionally, described acquisition module comprises:

First collecting unit, for gathering the voltage U at the first line down phase circuit two ends _ii;

Second collecting unit, for gathering the voltage U at the second line down circuit two ends _iIj.

A kind of reclosing method, is applied to band shunt reactor double-circuit line on same pole cross line fault circuit, comprises:

Gather the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj, wherein, 1≤i≤3,1≤j≤3, i, j are respectively integer, and i represents the first loop line i-th phase, and j represents the second loop line jth phase;

According to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Calculate described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Calculate setting valve U _dz;

Judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, obtain judged result;

When described judged result is for being, after postponing the second Preset Time, reclosing according to phase order lock; When described judged result is no, maintains and open a sluice gate state, to keep in repair.

Optionally, the voltage U at the first line down phase circuit two ends is gathered respectively _iiwith the voltage U at the second line down phase circuit two ends _iIjbefore, also comprise:

After fault phase line tripping, delay control three Preset Time;

The voltage U gathering the first line down phase circuit two ends is respectively performed after described 3rd Preset Time of delay _iiwith the voltage U at the second line down phase circuit two ends _iIjstep.

Optionally, described first Preset Time is 30 milliseconds.

Optionally, described second Preset Time is 500 milliseconds.

Optionally, described 3rd Preset Time is 100 milliseconds.

A kind of reclosing system, is applied to band shunt reactor double-circuit line on same pole cross line fault circuit, comprises:

Acquisition module, for gathering the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj;

Fault phase β mode voltage computing module, for the voltage U according to described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Free frequency component amplitude computing module, for calculating described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Setting valve computing module, for calculating setting valve U _dz;

Judgement of failure module, for judging described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, obtain judged result;

Reclosing control module, for according to described judged result, when described judged result is for being, after postponing the second Preset Time, reclosing according to phase order lock; When described judged result is no, maintains and open a sluice gate state, to keep in repair.

Optionally, also comprise:

3rd predetermined time delay module, is connected with described acquisition module, and for after faulty line tripping operation, delay control three Preset Time, controls the voltage U that described acquisition module starts to gather respectively described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj.

Compared with prior art, the present invention includes following advantage:

Technical scheme provided by the invention, gathers the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIjafter, according to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _βt (), then calculates described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁, calculate setting valve U _dz, finally judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, if so, then faulty line is transient fault; If not, then faulty line is permanent fault.Solve in prior art, the defect of the double-circuit line on same pole cross line fault character being with shunt reactor cannot be judged.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is a kind of method of discrimination process flow diagram with shunt reactor double-circuit line on same pole cross line fault character disclosed by the invention;

Fig. 2 is a kind of discriminating gear structural drawing with shunt reactor double-circuit line on same pole cross line fault character disclosed by the invention;

Fig. 3 is acquisition module structural drawing disclosed by the invention;

Fig. 4 is a kind of reclosing method flow diagram disclosed in the embodiment of the present invention two;

Fig. 5 is a kind of reclosing method flow diagram disclosed in the embodiment of the present invention three;

Fig. 6 is a kind of reclosing system construction drawing disclosed by the invention;

Fig. 7 is another reclosing system construction drawing disclosed by the invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Embodiment one

Fig. 1 is a kind of method of discrimination process flow diagram with shunt reactor double-circuit line on same pole cross line fault character disclosed by the invention, and as shown in Figure 1, the method comprises:

Step S101: the voltage U gathering the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj, wherein, 1≤i≤3,1≤j≤3, i, j are respectively integer, and i represents the first loop line i-th phase, and j represents the second loop line jth phase;

Step S102: according to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Concrete, decoupling zero process is carried out to the voltage at fault phase circuit two ends, solves described fault phase β mode voltage U _β(t):

$U_{\mathrm{\β}}\left(t\right)=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{U}_{\mathrm{Ii}}\left(t\right)-\frac{1}{m}\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{U}_{\mathrm{IIj}}\left(t\right),\left\{\begin{array}{c}1\≤n\≤3\\ 1\≤m\≤3\\ n+m=p\≤4\end{array}\right.---\left(1\right)$

Wherein, n is the number of the fault phase on first (I) loop line, and m is the number of fault phase on second (II) loop line; P is the number of the total fault phase of double-circuit line on same pole.

Step S103: calculate described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Concrete, utilize least square method to extract described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁.Optionally, solving model is constructed:

Wherein, ω ₀for power frequency angular frequency, ω _βfor free corner frequency, can proper polynomial is approximate to be obtained by solving; be respectively power frequency component initial phase, free frequency component initial phase; σ (t) is noise item.The length of least square fitting data window optionally, is 20ms, can obtain described free frequency component amplitude U ₁.

Step S104: calculate setting valve U _dz;

Concrete:

$U_{\mathrm{dz}}=\sqrt{2}{K}_k{U}_{0\mathrm{\β}}---\left(3\right)$

Wherein, K _kfor reliability coefficient, optionally, K _kspan be 0.3 ~ 0.5, U _{0 β}for U under instantaneity cross line fault _βthe theoretical effective value of free frequency component in (t);

Wherein, be respectively the electric capacity power frequency coupled voltages of fault phase on first (I), second (II) loop line, after namely utilizing failure vanishes, the capacitor coupling voltage difference of different line down phase replaces U _{0 β}.

Step S105: judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, if so, then faulty line is transient fault; If not, then faulty line is permanent fault;

Concrete, by described free frequency component amplitude U ₁with described setting valve U _dzcompare, suppose that Output rusults is out:

$\mathrm{out}=\left\{\begin{array}{c}1;U_1\&GreaterEqual;U_{\mathrm{dz}}\\ 0;U_1<U_{\mathrm{dz}}\end{array}\right.---\left(5\right)$

If in described first Preset Time, out keeps high level, then judge that the cross line fault character of double circuit lines circuit is as transient fault; If in described first Preset Time, out keeps low level always, then judge that the cross line fault character of double circuit lines circuit is as permanent fault.Optionally, described first Preset Time is 30 milliseconds.

Corresponding to a kind of method of discrimination with shunt reactor double-circuit line on same pole cross line fault character disclosed by the invention, the present invention also discloses a kind of discriminating gear with shunt reactor double-circuit line on same pole cross line fault character.

Fig. 2 is a kind of discriminating gear structural drawing with shunt reactor double-circuit line on same pole cross line fault character disclosed by the invention.As shown in Figure 2, this device comprises:

Acquisition module 201, for gathering the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj;

Fault phase β mode voltage computing module 202, for the voltage U according to described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Free frequency component amplitude computing module 203, for calculating described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Setting valve computing module 204, for calculating setting valve U _dz;

Judgement of failure module 205, for judging described free frequency component amplitude U ₁described setting valve U whether is not less than in continuous print first Preset Time _dz, if so, then faulty line is transient fault; If not, then faulty line is permanent fault.

Concrete, Fig. 3 is acquisition module structural drawing disclosed by the invention.As shown in Figure 3, this module can comprise:

First collecting unit 2011, for gathering the voltage U at the first line down phase circuit two ends _ii;

Second collecting unit 2012, is connected with described first collecting unit 2011, for gathering the voltage U at the second line down circuit two ends _iIj.

The technical scheme that the embodiment of the present invention one provides, gathers the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIjafter, according to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _βt (), then calculates described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁, calculate setting valve U _dz, finally judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, if so, then faulty line is transient fault; If not, then faulty line is permanent fault.Solve in prior art, the defect of the double-circuit line on same pole cross line fault character being with shunt reactor cannot be judged.

Further, apply a kind of method of discrimination with shunt reactor double-circuit line on same pole cross line fault character disclosed by the invention or device, the adaptive reclosing method and system of band shunt reactor double-circuit line on same pole can be formed.For this reason, the invention discloses embodiment two and embodiment three.

Embodiment two

Fig. 4 is a kind of reclosing method flow diagram disclosed in the embodiment of the present invention two, and as shown in Figure 4, the method comprises:

Step S401: the voltage U gathering the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj, wherein, 1≤i≤3,1≤j≤3, i, j are respectively integer, and i represents the first loop line i-th phase, and j represents the second loop line jth phase;

Step S402: according to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Step S403: calculate described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Step S404: calculate setting valve U _dz;

Step S405: judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz; If so, step S406 is performed, otherwise, perform step S407;

Concrete, judge described free frequency component amplitude U ₁whether be not less than described setting valve U _dz, obtain judged result, described judged result is yes, then faulty line is transient fault; Described judged result is no, then faulty line is permanent fault.

Step S406: after postponing the second Preset Time, reclosing according to phase order lock;

Described reclosing refers to that the lock disconnecting closes.Concrete, when described judged result is for being, after postponing described second Preset Time, reclosing according to phase order lock, described second Preset Time optionally, is 0.5 second.

Step S407: maintain and open a sluice gate state, to keep in repair;

Concrete, when described judged result is no, two loop lines not reclosing, maintains and opens a sluice gate state, to keep in repair.

Technical scheme disclosed in the embodiment of the present invention two, can judge the double-circuit line on same pole cross line fault character being with shunt reactor, obtain judged result, according to described judged result, when faulty line is transient fault, after postponing the second Preset Time, reclosing according to phase order lock; When faulty line is permanent fault, maintains and open a sluice gate state, to keep in repair.Solve in prior art, because the double-circuit line on same pole cross line fault character being with shunt reactor cannot be judged, thus cause the defect that cannot form effective reclosing method.

Technical scheme disclosed in the embodiment of the present invention two, just starts the voltage U gathering the first line down phase circuit two ends respectively after double-circuit line on same pole generation cross line fault character _iiwith the voltage U at the second line down phase circuit two ends _iIj, the voltage U at the described first line down phase circuit two ends collected like this _iiwith the voltage U at the second line down phase circuit two ends _iIjerror is sometimes comparatively large, can affect the differentiation of follow-up double-circuit line on same pole cross line fault character, thus whether impact carries out the judgement of reclosing, reduces the control accuracy to plug-in strip.For this reason, disclosed embodiment three of the present invention, in order to solve the voltage U at the described first line down phase circuit two ends collected in embodiment two scheme _iiwith the voltage U at the second line down phase circuit two ends _iIjthe defect that error is sometimes larger.

Embodiment three

Fig. 5 is a kind of reclosing method flow diagram disclosed in the embodiment of the present invention three, and as shown in Figure 5, the method comprises:

Step S501: after fault phase line tripping, delay control three Preset Time;

Concrete, after fault phase line tripping, delay control three Preset Time, described 3rd Preset Time optionally, is 100 milliseconds.After fault phase line tripping, after postponing described 3rd Preset Time, then perform step S502.

Step S502: the voltage U gathering the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj, wherein, 1≤i≤3,1≤j≤3, i, j are respectively integer, and i represents the first loop line i-th phase, and j represents the second loop line jth phase;

Step S503: according to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Step S504: calculate described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Step S505: calculate setting valve U _dz;

Step S506: judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz; If so, step S407 is performed, otherwise, perform step S408;

Step S507: after postponing the second Preset Time, reclosing according to phase order lock;

Step S408: maintain and open a sluice gate state, to keep in repair.

Technical scheme disclosed in the embodiment of the present invention three, after fault phase line tripping, after delay control three Preset Time, then performs the voltage U gathering the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIjstep, effectively can reduce the voltage U at the described first line down phase circuit two ends collected _iiwith the voltage U at the second line down phase circuit two ends _iIjerror, thus less on the differentiation of follow-up double-circuit line on same pole cross line fault character impact, less on the judgement impact whether carrying out reclosing, improve the control accuracy to plug-in strip.

Corresponding to a kind of reclosing method disclosed in embodiment two, the application also discloses a kind of reclosing system.Fig. 6 is a kind of reclosing system construction drawing disclosed by the invention, and as shown in Figure 6, this system comprises:

Acquisition module 601, for gathering the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj;

Fault phase β mode voltage computing module 602, for the voltage U according to described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Free frequency component amplitude computing module 603, for calculating described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Setting valve computing module 604, for calculating setting valve U _dz;

Judgement of failure module 605, for judging described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, obtain judged result;

Reclosing control module 606, for according to described judged result, when described judged result is for being, after postponing the second Preset Time, reclosing according to phase order lock; When described judged result is no, maintains and open a sluice gate state, to keep in repair.

Same, corresponding to a kind of reclosing method disclosed in embodiment three, the application also discloses another reclosing system.Fig. 7 is another reclosing system construction drawing disclosed by the invention, and as shown in Figure 7, this system comprises:

3rd predetermined time delay module 701, acquisition module 702, fault phase β mode voltage computing module 703, free frequency component amplitude computing module 704, setting valve computing module 705, Judgement of failure module 706 and reclosing control module 707;

Described 3rd predetermined time delay module 701, is connected with described acquisition module 702, and for after faulty line tripping operation, delay control three Preset Time, controls the voltage U that described acquisition module 702 starts to gather respectively described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj;

Described acquisition module 702, for gathering the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj;

Described fault phase β mode voltage computing module 703, for the voltage U according to described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Described free frequency component amplitude computing module 704, for calculating described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Described setting valve computing module 705, for calculating setting valve U _dz;

Described Judgement of failure module 706, for judging described free frequency component amplitude U ₁described setting valve U whether is not less than in continuous print first Preset Time _dz, obtain judged result;

Described reclosing control module 707, for according to described judged result, when described judged result is for being, after postponing the second Preset Time, reclosing according to phase order lock; When described judged result is no, maintains and open a sluice gate state, to keep in repair.

It should be noted that, each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.For device, system class embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.

Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.

Above the method for discrimination of band shunt reactor double-circuit line on same pole cross line fault character provided by the present invention and device are described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (10)

1. the method for discrimination with shunt reactor double-circuit line on same pole cross line fault character, is characterized in that, comprising:

Gather the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj, wherein, 1≤i≤3,1≤j≤3, i, j are respectively integer, and i represents the first loop line i-th phase, and j represents the second loop line jth phase;

According to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Calculate described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Calculate setting valve U _dz;

Judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, if so, then faulty line is transient fault; If not, then faulty line is permanent fault;

Wherein, described calculating fault phase β mode voltage U _βt () is specially:

Decoupling zero process is carried out to the voltage at fault phase circuit two ends, solves described fault phase β mode voltage U _β(t):

$U_{\mathrm{\&beta;}}\left(t\right)=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{U}_{\mathrm{Ii}}\left(t\right)-\frac{1}{m}\underset{j=1}{\overset{m}{\mathrm{\&Sigma;}}}{U}_{\mathrm{IIj}}\left(t\right),\left\{\begin{array}{c}1\&le;n\&le;3\\ 1\&le;m\&le;3\\ n+m=p\&le;4\end{array}\right.$

Wherein, n is the number of the fault phase on the first loop line, and m is the number of fault phase on the second loop line; P is the number of the total fault phase of double-circuit line on same pole.

2. the discriminating gear with shunt reactor double-circuit line on same pole cross line fault character, is characterized in that, comprising:

Acquisition module, for gathering the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj;

Fault phase β mode voltage computing module, for the voltage U according to described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Free frequency component amplitude computing module, for calculating described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Setting valve computing module, for calculating setting valve U _dz;

Judgement of failure module, for judging described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, if so, then faulty line is transient fault; If not, then faulty line is permanent fault;

Wherein, described calculating fault phase β mode voltage U _βt () is specially:

Decoupling zero process is carried out to the voltage at fault phase circuit two ends, solves described fault phase β mode voltage U _β(t):

$U_{\mathrm{\&beta;}}\left(t\right)=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{U}_{\mathrm{Ii}}\left(t\right)-\frac{1}{m}\underset{j=1}{\overset{m}{\mathrm{\&Sigma;}}}{U}_{\mathrm{IIj}}\left(t\right),\left\{\begin{array}{c}1\&le;n\&le;3\\ 1\&le;m\&le;3\\ n+m=p\&le;4\end{array}\right.$

Wherein, n is the number of the fault phase on the first loop line, and m is the number of fault phase on the second loop line; P is the number of the total fault phase of double-circuit line on same pole.

3. device according to claim 2, is characterized in that, described acquisition module comprises:

First collecting unit, for gathering the voltage U at the first line down phase circuit two ends _ii;

Second collecting unit, for gathering the voltage U at the second line down circuit two ends _iIj.

4. a reclosing method, is applied to band shunt reactor double-circuit line on same pole cross line fault circuit, it is characterized in that, comprising:

Gather the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj, wherein, 1≤i≤3,1≤j≤3, i, j are respectively integer, and i represents the first loop line i-th phase, and j represents the second loop line jth phase;

According to the voltage U at described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Calculate described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Calculate setting valve U _dz;

Judge described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, obtain judged result;

When described judged result is for being, after postponing the second Preset Time, reclosing according to phase order lock; When described judged result is no, maintains and open a sluice gate state, to keep in repair;

Wherein, wherein, described calculating fault phase β mode voltage U _βt () is specially:

Decoupling zero process is carried out to the voltage at fault phase circuit two ends, solves described fault phase β mode voltage U _β(t):

$U_{\mathrm{\&beta;}}\left(t\right)=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{U}_{\mathrm{Ii}}\left(t\right)-\frac{1}{m}\underset{j=1}{\overset{m}{\mathrm{\&Sigma;}}}{U}_{\mathrm{IIj}}\left(t\right),\left\{\begin{array}{c}1\&le;n\&le;3\\ 1\&le;m\&le;3\\ n+m=p\&le;4\end{array}\right.$

Wherein, n is the number of the fault phase on the first loop line, and m is the number of fault phase on the second loop line; P is the number of the total fault phase of double-circuit line on same pole.

5. method according to claim 4, is characterized in that, gathers the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIjbefore, also comprise:

After fault phase line tripping, delay control three Preset Time;

The voltage U gathering the first line down phase circuit two ends is respectively performed after described 3rd Preset Time of delay _iiwith the voltage U at the second line down phase circuit two ends _iIjstep.

6. method according to claim 4, is characterized in that, described first Preset Time is 30 milliseconds.

7. method according to claim 4, is characterized in that, described second Preset Time is 500 milliseconds.

8. method according to claim 5, is characterized in that, described 3rd Preset Time is 100 milliseconds.

9. a reclosing system, is applied to band shunt reactor double-circuit line on same pole cross line fault circuit, it is characterized in that, comprising:

Acquisition module, for gathering the voltage U at the first line down phase circuit two ends respectively _iiwith the voltage U at the second line down phase circuit two ends _iIj;

Fault phase β mode voltage computing module, for the voltage U according to described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj, calculate fault phase β mode voltage U _β(t);

Free frequency component amplitude computing module, for calculating described fault phase β mode voltage U _βthe free frequency component amplitude U of (t) ₁;

Setting valve computing module, for calculating setting valve U _dz;

Judgement of failure module, for judging described free frequency component amplitude U ₁described setting valve U whether is not less than in the first Preset Time _dz, obtain judged result;

Reclosing control module, for according to described judged result, when described judged result is for being, after postponing the second Preset Time, reclosing according to phase order lock; When described judged result is no, maintains and open a sluice gate state, to keep in repair;

Wherein, described calculating fault phase β mode voltage U _βt () is specially:

Decoupling zero process is carried out to the voltage at fault phase circuit two ends, solves described fault phase β mode voltage U _β(t):

$U_{\mathrm{\&beta;}}\left(t\right)=\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{U}_{\mathrm{Ii}}\left(t\right)-\frac{1}{m}\underset{j=1}{\overset{m}{\mathrm{\&Sigma;}}}{U}_{\mathrm{IIj}}\left(t\right),\left\{\begin{array}{c}1\&le;n\&le;3\\ 1\&le;m\&le;3\\ n+m=p\&le;4\end{array}\right.$

Wherein, n is the number of the fault phase on the first loop line, and m is the number of fault phase on the second loop line; P is the number of the total fault phase of double-circuit line on same pole.

10. system according to claim 9, is characterized in that, also comprises:

3rd predetermined time delay module, is connected with described acquisition module, and for after faulty line tripping operation, delay control three Preset Time, controls the voltage U that described acquisition module starts to gather respectively described first line down phase circuit two ends _iiwith the voltage U at described second line down phase circuit two ends _iIj.