CN103151763B - A kind of electric railway AT Traction networks fault distinguishing and guard method - Google Patents

A kind of electric railway AT Traction networks fault distinguishing and guard method Download PDF

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CN103151763B
CN103151763B CN201210453581.5A CN201210453581A CN103151763B CN 103151763 B CN103151763 B CN 103151763B CN 201210453581 A CN201210453581 A CN 201210453581A CN 103151763 B CN103151763 B CN 103151763B
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coupling section
self coupling
contact line
value
far
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CN103151763A (en
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李群湛
贺建闽
黄彦全
陈民武
陈维荣
吴积钦
李子晗
李亚楠
刘炜
郭锴
南晓强
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Southwest Jiaotong University
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  • Electric Propulsion And Braking For Vehicles (AREA)
  • Locating Faults (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract

A kind of electric railway AT Traction networks fault distinguishing and guard method, when net forces down in setting, unloaded trend value of symbol that is contact line T and negative feeder F in each self coupling section is near, far-end is designated as 0, and the trend value of symbol of inflow is 1, and the trend value of symbol of outflow is-1; If have: in self coupling section contact line T two ends trend value of symbol be more than or equal to 1 with the absolute value of value, or the Fault load flow value of symbol at negative feeder F two ends be more than or equal to 1 with the absolute value of value, or the Fault load flow value of symbol at contact line T branch road and negative feeder F branch road two ends be all more than or equal to 1 with the absolute value of value; Then judge respectively to come in contact net T shorted to earth fault or negative feeder F shorted to earth fault or contact line T in this self coupling section to negative feeder F short trouble; And disconnect all circuit breakers at these self coupling section two ends; Abort situation is determined by the length of the relevant voltage at these self coupling section two ends and the short-circuit reactance of calculation of short-circuit current and corresponding self coupling section.

Description

A kind of electric railway AT Traction networks fault distinguishing and guard method
Technical field
The present invention relates to a kind of electric railway AT Traction networks fault distinguishing and guard method.
Background technology
Electric railway traction power supply system is made up of traction substation and Traction networks, and Traction networks is made up of contact line, train, rail (and ground).Traction networks generally adopts the simple direct feeding system of structure.For adapting to the operation demand of the high-power train of high-speed railway, Japan, high-speed railway Traction networks that is French and China all have employed autotransformer (AT) supply power mode.For strengthening power supply capacity further, China also all have employed the supply power mode of up-downgoing in autotransformer (AT) place's parallel connection on nearly 10,000km high-speed railways, is called all-parallel AT traction system mode.But, must see, the complexity of the electric power networks formed due to AT Traction networks, non-linear, the ambiguity of Traction networks reactance-range performance entered viewed from traction bus and the restriction of existing technology, make the searching of Traction networks fault, locate, excise, isolate and become difficulty and inaccurate, simultaneously, any one fault of full Parallel AT Traction networks will cause whole piece Traction networks to be stopped transport, greatly reduce again the reliability of natively weak Traction networks, affect, restrict the good operation of high-speed railway on the contrary.
Summary of the invention
Object of the present invention is just to provide a kind of electric railway AT Traction networks fault distinguishing and guard method; the method can reflect fault type and the position of Traction networks in time, quickly and accurately; and can excise rapidly, isolate and fix a breakdown; reduce accident and coverage, improve the reliability of traction power supply.
The present invention solves its technical problem, and the technical scheme adopted is: a kind of electric railway AT Traction networks fault distinguishing and guard method, the steps include:
The negative feeder magnitude of voltage that the contact line magnitude of voltage that the contact line T voltage to earth instrument transformer that A, measurement and control center's real-time synchronization gather each autotransformer ATn place detects, negative feeder F voltage to earth instrument transformer detect, wherein n is the sequence number of self coupling section, n=1,2,3 ..., N; When all contact line magnitudes of voltage, negative feeder magnitude of voltage are all more than or equal to setting, then judge that Traction networks is not short-circuited fault, does not take protection act to Traction networks; Otherwise, carry out the operation of following steps;
B, measurement and control center's real-time synchronization gather near, far-end current value ITna, ITnb of the contact line T that the current transformer that is near, far-end of contact line T in each self coupling section n detects, and real-time synchronization gathers near, far-end current value IFna, the IFnb of the negative feeder F that the current transformer that is near, far-end of negative feeder F detects in each self coupling section n; According near, far-end current value ITna, ITnb of each self coupling section contact line T, near, far-end current value IFna, IFnb of each self coupling section negative feeder F, measurement and control center's real-time judge goes out that each self coupling section n contact line T is near, far-end and negative feeder F is near, the direction of tide of far-end, and the trend value of symbol of inflow direction is demarcated as 1, flows out that the trend value of symbol in direction is demarcated as-1, unloaded trend value of symbol is demarcated as 0;
If C has, the interior contact line T of self coupling section n ' is near, the trend value of symbol of far-end be more than or equal to 1 with the absolute value of value, but the interior negative feeder F of this self coupling section n ' is near, the trend value of symbol of far-end be less than 1 with the absolute value of value, then measurement and control center judges that this self coupling section n ' inside comes in contact net T shorted to earth fault, make contact line circuit breaker KTn ' a, KTn ' b separating brake at this self coupling section n ' two ends, overlap again, successful reclosing, then recover normal;
Reclosing failure, then make that this self coupling section n ' is near, contact line circuit breaker KTn ' a, the KTn ' b separating brake together with negative feeder circuit breaker KFn ' a, KFn ' b of far-end; Simultaneously, one end that this self coupling section n ' is near, far-end short circuit currents is larger is selected by measurement and control center, and calculate short-circuit reactance by the autotransformer ATn ' nearest with this end or the contact line magnitude of voltage at AT (n '+1) place and this end current value of contact line, and the contact line T of this self coupling section n ' and total reactance in rail loop, then draw the distance of short circuit trouble point apart from this autotransformer ATn ' or AT (n '+1) by the length that the ratio of short-circuit reactance and this total reactance is multiplied by this self coupling section n;
If D has, the interior negative feeder F of self coupling section n ' is near, the trend value of symbol of far-end be more than or equal to 1 with the absolute value of value, but the interior contact line T of this self coupling section n ' is near, the trend value of symbol of far-end with value be less than 1, then measurement and control center judges this self coupling section n ' interior generation negative feeder F shorted to earth fault, make negative feeder circuit breaker KFn ' a, KFn ' b separating brake at this self coupling section n ' two ends, overlap again, successful reclosing, then recover normal;
Reclosing failure, then make that this self coupling section n ' is near, negative feeder circuit breaker KFn ' a, the KFn ' b separating brake together with contact line circuit breaker KTn ' a, KTn ' b of far-end; Simultaneously, one end that this self coupling section n ' is near, far-end short circuit currents is larger is selected by measurement and control center, and calculate short-circuit reactance by the autotransformer ATn ' nearest with this end or the negative feeder magnitude of voltage at AT (n '+1) place and this end current value of negative feeder, and the negative feeder F of this self coupling section n ' and total reactance in rail loop, then draw the distance of short circuit trouble point apart from this autotransformer ATn ' or AT (n '+1) by the length that the ratio of short-circuit reactance and this total reactance is multiplied by this self coupling section n;
If F has, self coupling section n ' interior contact line T is near, the trend value of symbol of far-end with value be more than or equal to 1 and the interior negative feeder F of this self coupling section n ' closely, the trend value of symbol of far-end be also more than or equal to 1 with the absolute value of value, then measurement and control center judges that this self coupling section n ' inside comes in contact net T to negative feeder F short trouble, or comes in contact net T and negative feeder F simultaneously short trouble over the ground; Measurement and control center makes contact line circuit breaker KTn ' a, KTn ' b and negative feeder circuit breaker KFn ' a, the equal separating brake of KFn ' b at this self coupling section n two ends, then overlaps, successful reclosing, then recover normal;
Reclosing failure, then make that this self coupling section n ' is near, contact line circuit breaker KTn ' a, the KTn ' b of far-end and negative feeder circuit breaker KFn ' a, KFn ' b separating brake again; Simultaneously, simultaneously, one end that this self coupling section n ' is near, far-end short circuit currents is larger is selected by measurement and control center, and by the contact line magnitude of voltage at the autotransformer ATn ' nearest with this end or AT (n '+1) place, negative feeder magnitude of voltage and calculate short-circuit reactance with this end current value of contact line and calculate short-circuit reactance, and total reactance in this self coupling section n ' interior contact line T and negative feeder F loop, then draw the distance of short circuit trouble point apart from this autotransformer ATn ' or AT (n '+1) by the length that the ratio of short-circuit reactance and this total reactance is multiplied by this self coupling section n '.
Operation principle of the present invention is:
By gathering autotransformer ATn place contact line T and the negative feeder F voltage to earth value of each self coupling section n; when there being contact line magnitude of voltage, negative feeder magnitude of voltage is less than or equal to setting; show that Traction networks there occurs short trouble, its position need be judged and take protection act.
Now, measurement and control center's real-time synchronization gathers the contact line current value at the contact line T two ends near, far away in each self coupling (AT) section n, the current value at negative feeder F two ends near, far away, and judge that each self coupling section n contact line T is near according to this, far-end and negative feeder F is near, the direction of tide of far-end, and the trend value of symbol of inflow direction is demarcated as 1, flows out that the trend value of symbol in direction is demarcated as-1, unloaded trend value of symbol is demarcated as 0;
Due to contact line or negative feeder two ends in self coupling section trend value of symbol be more than or equal to 1 with the absolute value of value time, show to flow on this section of circuit not mate with the electric current flowed out, there is the leakage of big current, determine accordingly to there occurs short trouble on this section of circuit, thus determine self coupling section and the fault type (contact line shorted to earth, negative feeder shorted to earth, contact line are to negative feeder short circuit) thereof of the guilty culprit that is short-circuited, and make corresponding breaker open operation and reclosing, in this way instantaneous short circuit or interference caused by, then can reclosing success; Unsuccessful reclosing, then show that short trouble is permanent fault, and measurement and control center makes the permanent separating brake of all circuit breakers of this self coupling section (until after confirming failture evacuation, then closing a floodgate); And and then drawn the particular location of fault point by the reactance of short-circuit loop.
Compared with prior art, the invention has the beneficial effects as follows:
One, the present invention introduces the voltage to earth value of autotransformer ATn place contact line T and negative feeder F, the current value of symbol at each self coupling section two ends with value as criterion, can facilitate, reliably judge out of order type and particular location, and all circuit breakers at timely self coupling section two ends, open failure place, enhance the selectivity of relaying protection, quick-action and reliability, more effective, excise exactly, isolation, fix a breakdown, avoid the extension of fault effects, ensure that the continuation of non-faulting section in Traction networks runs, reduce power failure range, and then improve the reliability of traction power supply.On the other hand, operator on duty passes through the measurement and control center in electric substation or control room, can under power failure state, in time, accurately understand, grasp type and the particular location of fault in Traction networks, maintenance personal is guided accurately to go to field service, fix a breakdown, ensure that train recovers rapidly normal operation, decrease the loss of power failure.
Two, the present invention can be combined with TD information further, strengthens controllability and the flexibility of Traction networks operational mode.
Three, the invention process is got up to invest less, both can be used for new line construction and has also been applicable to the transformation of old line.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment of the present invention.
Embodiment
Embodiment 1
Fig. 1 illustrates, a kind of embodiment of the present invention is: a kind of electric railway AT Traction networks fault distinguishing and guard method, the steps include:
The negative feeder magnitude of voltage that the contact line magnitude of voltage that the contact line T voltage to earth instrument transformer that A, measurement and control center's real-time synchronization gather each autotransformer ATn place detects, negative feeder F voltage to earth instrument transformer detect, wherein n is the sequence number of self coupling section, n=1,2,3 ..., N; When all contact line magnitudes of voltage, negative feeder magnitude of voltage are all more than or equal to setting, then judge that Traction networks is not short-circuited fault, does not take protection act to Traction networks; Otherwise, carry out the operation of following steps;
B, measurement and control center's real-time synchronization gather near, far-end current value ITna, ITnb of the contact line T that the current transformer that is near, far-end of contact line T in each self coupling section n detects, and real-time synchronization gathers near, far-end current value IFna, the IFnb of the negative feeder F that the current transformer that is near, far-end of negative feeder F detects in each self coupling section n; According near, far-end current value ITna, ITnb of each self coupling section contact line T, near, far-end current value IFna, IFnb of each self coupling section negative feeder F, measurement and control center's real-time judge goes out that each self coupling section n contact line T is near, far-end and negative feeder F is near, the direction of tide of far-end, and the trend value of symbol of inflow direction is demarcated as 1, flows out that the trend value of symbol in direction is demarcated as-1, unloaded trend value of symbol is demarcated as 0;
If C has, the interior contact line T of self coupling section n ' is near, the trend value of symbol of far-end be more than or equal to 1 with the absolute value of value, but the interior negative feeder F of this self coupling section n ' is near, the trend value of symbol of far-end be less than 1 with the absolute value of value, then measurement and control center judges that this self coupling section n ' inside comes in contact net T shorted to earth fault, make contact line circuit breaker KTn ' a, KTn ' b separating brake at this self coupling section n ' two ends, overlap again, successful reclosing, then recover normal;
Reclosing failure, then make that this self coupling section n ' is near, contact line circuit breaker KTn ' a, the KTn ' b separating brake together with negative feeder circuit breaker KFn ' a, KFn ' b of far-end; Simultaneously, one end that this self coupling section n ' is near, far-end short circuit currents is larger is selected by measurement and control center, and calculate short-circuit reactance by the autotransformer ATn ' nearest with this end or the contact line magnitude of voltage at AT (n '+1) place and this end current value of contact line, and the contact line T of this self coupling section n ' and total reactance in rail loop, then draw the distance of short circuit trouble point apart from this autotransformer ATn ' or AT (n '+1) by the length that the ratio of short-circuit reactance and this total reactance is multiplied by this self coupling section n.
As: in Fig. 1, in self coupling section n '=2 i.e. self coupling section 2 near, the far-end of contact line T trend value of symbol equal 2 with value, in self coupling section 2 near, the far-end of negative feeder trend value of symbol be zero with value, other self couplings section n (n=1,3,4 ..., N) near, the far-end of contact line T and negative feeder F is near, the trend value of symbol of far-end be zero with value.Measurement and control center then judges to come in contact net T shorted to earth fault in self coupling section 2, makes contact line circuit breaker KT2a, KT2b separating brake at self coupling section 2 two ends near, far away, then overlaps, successful reclosing, then recover normal.Reclosing failure, then make contact line circuit breaker KT2a, KT2b separating brake together with negative feeder circuit breaker KF2a, KF2b at self coupling section 2 two ends near, far away; Simultaneously, measurement and control center's contrast find the short circuit current IT2a of self coupling section 2 contact line T near-end be greater than contact line T far-end short circuit current IT2b, the contact line magnitude of voltage at autotransformer AT2 place (i.e. the autotransformer of self coupling section 2) nearest with self coupling section 2 contact line T near-end and the contact line current value IT2a of this end is then selected to calculate short-circuit reactance, and the contact line T of self coupling section 2 and total reactance in rail loop, the length being multiplied by self coupling section 2 with the ratio of short-circuit reactance and total reactance draws the distance of short circuit trouble point apart from autotransformer AT2.
And for example in Fig. 1, if the trend value of symbol of contact line T near-end is 1 and the trend value of symbol of far-end is 0 in self coupling section n '=2 i.e. self coupling section 2, the absolute value of itself and value equals 1; In self coupling section 2 near, the far-end of negative feeder trend value of symbol be zero with value, other self couplings section n (n=1,3,4 ..., N) contact line T and negative feeder F near-end and far-end trend value of symbol be zero with value; Measurement and control center then judges that shorted to earth fault occurs the contact line T in self coupling section 2.Simultaneously, because the trend value of symbol of contact line T near-end in self coupling section 2 is 1 and the trend value of symbol of far-end is 0, namely also near-end has that electric current flows into, far-end do not have electric current to flow through measurement and control center can to judge further: near the near-end generation shorted to earth fault of autotransformer AT2 contact line T, far-end then disconnection fault occurs.Measurement and control center's contrast find the short circuit current IT2a of self coupling section 2 contact line T near-end much larger than contact line T far-end breaking current IT2b, the contact line magnitude of voltage at autotransformer AT2 place nearest with self coupling section 2 contact line T near-end and the contact line current value IT2a of this end is then selected to calculate short-circuit reactance, and the contact line T of self coupling section 2 and total reactance in rail loop, the length being multiplied by self coupling section 2 with the ratio of short-circuit reactance and total reactance draws the distance of short circuit trouble point apart from autotransformer AT2.
If D has, the interior negative feeder F of self coupling section n ' is near, the trend value of symbol of far-end be more than or equal to 1 with the absolute value of value, but the interior contact line T of this self coupling section n ' is near, the trend value of symbol of far-end with value be less than 1, then measurement and control center judges this self coupling section n ' interior generation negative feeder F shorted to earth fault, make negative feeder circuit breaker KFn ' a, KFn ' b separating brake at this self coupling section n ' two ends, overlap again, successful reclosing, then recover normal;
Reclosing failure, then make that this self coupling section n ' is near, negative feeder circuit breaker KFn ' a, the KFn ' b separating brake together with contact line circuit breaker KTn ' a, KTn ' b of far-end; Simultaneously, one end that this self coupling section n ' is near, far-end short circuit currents is larger is selected by measurement and control center, and calculate short-circuit reactance by the autotransformer ATn ' nearest with this end or the negative feeder magnitude of voltage at AT (n '+1) place and this end current value of negative feeder, and the negative feeder F of this self coupling section n ' and total reactance in rail loop, then draw the distance of short circuit trouble point apart from this autotransformer ATn ' or AT (n '+1) by the length that the ratio of the total reactance of short-circuit reactance and loop is multiplied by this self coupling section n.
As: in Fig. 1, in self coupling section n '=2 i.e. self coupling section 2 near, the far-end of negative feeder F trend value of symbol equal 2 with value, in self coupling section 2 near, the far-end of contact line T trend value of symbol be zero with value, other self couplings section n (n=1,3,4 ..., N) near, the far-end of contact line T and negative feeder is near, the trend value of symbol of far-end be zero with value.Measurement and control center then judges negative feeder F shorted to earth fault occurs in self coupling section 2, makes negative feeder circuit breaker KT2a, KT2b separating brake at self coupling section 2 two ends near, far away, then overlaps, successful reclosing, then recover normal.Reclosing failure, then make negative feeder circuit breaker KF2a, KF2b separating brake together with contact line circuit breaker KT2a, KT2b at self coupling section 2 two ends near, far away; Simultaneously, measurement and control center's contrast find the short circuit current IF2a of self coupling section 2 negative feeder F near-end be greater than negative feeder F far-end short circuit current IF2b, the negative feeder magnitude of voltage at autotransformer AT2 place nearest with self coupling section 2 negative feeder F near-end and the current value IF2a of this end of negative feeder F is then selected to calculate short-circuit reactance, and total reactance in the negative feeder F of self coupling section 2 and the loop of rail, the length being multiplied by self coupling section 2 with the ratio of short-circuit reactance and total reactance draws the distance of short circuit trouble point apart from autotransformer AT2.
If F has, self coupling section n ' interior contact line T is near, the trend value of symbol of far-end with value be more than or equal to 1 and the interior negative feeder F of this self coupling section n ' closely, the trend value of symbol of far-end be also more than or equal to 1 with the absolute value of value, then measurement and control center judges that this self coupling section n ' inside comes in contact net T to negative feeder F short trouble, or comes in contact net T and negative feeder F simultaneously short trouble over the ground; Measurement and control center makes contact line circuit breaker KTn ' a, KTn ' b and negative feeder circuit breaker KFn ' a, the equal separating brake of KFn ' b at this self coupling section n two ends, then overlaps, successful reclosing, then recover normal;
Reclosing failure, then make that this self coupling section n ' is near, contact line circuit breaker KTn ' a, the KTn ' b of far-end and negative feeder circuit breaker KFn ' a, KFn ' b separating brake again; One end that this self coupling section n ' is near, far-end short circuit currents is larger is selected by measurement and control center simultaneously, and by the contact line magnitude of voltage at the autotransformer ATn ' nearest with this end or AT (n '+1) place, negative feeder magnitude of voltage and calculate short-circuit reactance with this end current value of contact line and calculate short-circuit reactance, and the total reactance in loop of this self coupling section n ' interior contact line T and negative feeder F, then draw the distance of short circuit trouble point apart from this autotransformer ATn ' or AT (n '+1) by the length that the ratio of the total reactance of short-circuit reactance and this loop is multiplied by this self coupling section n '.
As: in Fig. 1, if in self coupling section n '=3 i.e. self coupling section 3, contact line T is near, the trend value of symbol of far-end be 2 with the absolute value of value, in self coupling section 3 negative feeder F closely, the trend value of symbol of far-end be also 2 with the absolute value of value; Other self couplings section n (n=1,2,4 ..., N) near, the far-end of contact line T and negative feeder is near, the trend value of symbol of far-end be zero with value.Measurement and control center then judges to come in contact the short trouble between net T and negative feeder F in self coupling section 3, makes contact line circuit breaker KT3a, KT3b and the equal separating brake of negative feeder circuit breaker KF3a, KF3b at self coupling section 3 two ends, then overlaps, successful reclosing, then recover normal.Reclosing failure, then make that self coupling section 3 is near, contact line circuit breaker KT3a, KT3b of far-end and negative feeder circuit breaker KF3a, KF3b separating brake all again, simultaneously, measurement and control center's contrast finds that the short circuit current IT3a (equal negative feeder F near-end short circuit current IF3a) of self coupling section 3 contact line T near-end is greater than the short circuit current IT3b (equaling the short circuit current IF3b of negative feeder F far-end) of the contact line T of far-end, the current value IT3a in the contact line circuit breaker KT3a of autotransformer AT3 (i.e. the autotransformer of self coupling section 3) place's contact line magnitude of voltage nearest with self coupling section 3 contact line T near-end and negative feeder magnitude of voltage and this end is then selected to calculate short-circuit reactance, and total reactance in self coupling section 3 contact line T and negative feeder F loop, the length being multiplied by self coupling section 3 with the ratio of short-circuit reactance and total reactance draws the distance of short circuit trouble point apart from the autotransformer AT3 of self coupling section 3.
Obviously, the specific occurrence that the n ' in the present invention is n is the sequence number that contact line T (or negative feeder F) there occurs the self coupling section of short trouble, as in Fig. 1, and n '=2 or 3.
Method of the present invention can also judge the combined failure that open circuit also occurs that had both been short-circuited in each self coupling of Traction networks section n and locate.To contact line or the negative feeder F of the self coupling section n of the fault that is judged to be short-circuited, trend value of symbol as its one end is 0 (namely this end does not have electric current to flow through), then can judge that contact line T or negative feeder F is at this end generation disconnection fault, and be short-circuited fault at the other end.
Obviously, the method for operation of this example and step can be applicable to the single line AT Traction networks situation of Fig. 1, also can be applicable to the situation of the parallel connection of multiple line AT Traction networks end and the full Parallel AT Traction networks of multiple line.

Claims (1)

1. electric railway AT Traction networks fault distinguishing and a guard method, the steps include:
The negative feeder magnitude of voltage that the contact line magnitude of voltage that the contact line T voltage to earth instrument transformer that A, measurement and control center's real-time synchronization gather each autotransformer ATn place detects, negative feeder F voltage to earth instrument transformer detect, wherein n is the sequence number of self coupling section, n=1,2,3 ..., N; When all contact line magnitudes of voltage, negative feeder magnitude of voltage are all more than or equal to setting, then judge that Traction networks is not short-circuited fault, does not take protection act to Traction networks; Otherwise, carry out the operation of following steps;
B, measurement and control center's real-time synchronization gather near, far-end current value ITna, ITnb of the contact line T that the current transformer that is near, far-end of contact line T in each self coupling section n detects, and real-time synchronization gathers near, far-end current value IFna, the IFnb of the negative feeder F that the current transformer that is near, far-end of negative feeder F detects in each self coupling section n; According near, far-end current value ITna, ITnb of each self coupling section contact line T, near, far-end current value IFna, IFnb of each self coupling section negative feeder F, measurement and control center's real-time judge goes out that each self coupling section n contact line T is near, far-end and negative feeder F is near, the direction of tide of far-end, and the trend value of symbol of inflow direction is demarcated as 1, flows out that the trend value of symbol in direction is demarcated as-1, unloaded trend value of symbol is demarcated as 0;
If C has, contact line T in self coupling section n' is near, the trend value of symbol of far-end be more than or equal to 1 with the absolute value of value, but in this self coupling section n' near, the far-end of negative feeder F trend value of symbol be less than 1 with the absolute value of value, then measurement and control center judges to come in contact net T shorted to earth fault in this self coupling section n', makes the contact line circuit breaker KT at this self coupling section n' two ends n'a, KT n'b separating brake, then overlap, successful reclosing, then recover normal;
Reclosing failure, then make that this self coupling section n' is near, the contact line circuit breaker KT of far-end n'a, KT n'b and negative feeder circuit breaker KF n'a, KF n'b is separating brake together; Meanwhile, one end that this self coupling section n' is near, far-end short circuit currents is larger is selected by measurement and control center, and by the autotransformer AT nearest with this end n'or AT (n'+1)the contact line magnitude of voltage at place and this end current value of contact line calculate short-circuit reactance, and the contact line T of this self coupling section n' and total reactance in rail loop, then show that short circuit trouble point is apart from this autotransformer AT by the length that the ratio of short-circuit reactance and this total reactance is multiplied by this self coupling section n' n'or AT (n'+1)distance;
If D has, negative feeder F in self coupling section n' is near, the trend value of symbol of far-end be more than or equal to 1 with the absolute value of value, but in this self coupling section n' near, the far-end of contact line T trend value of symbol be less than 1 with the absolute value of value, then measurement and control center judges negative feeder F shorted to earth fault occurs in this self coupling section n', makes the negative feeder circuit breaker KF at this self coupling section n' two ends n'a, KF n'b separating brake, then overlap, successful reclosing, then recover normal;
Reclosing failure, then make that this self coupling section n' is near, the negative feeder circuit breaker KF of far-end n'a, KF n'b and contact line circuit breaker KT n'a, KT n'b is separating brake together; Meanwhile, one end that this self coupling section n' is near, far-end short circuit currents is larger is selected by measurement and control center, and by the autotransformer AT nearest with this end n'or AT (n'+1)the negative feeder magnitude of voltage at place and this end current value of negative feeder calculate short-circuit reactance, and the negative feeder F of this self coupling section n' and total reactance in rail loop, then show that short circuit trouble point is apart from this autotransformer AT by the length that the ratio of short-circuit reactance and this total reactance is multiplied by this self coupling section n' n'or AT (n'+1)distance;
If E has, contact line T in self coupling section n' is near, the trend value of symbol of far-end be more than or equal to 1 with the absolute value of value and in this self coupling section n' negative feeder F closely, the trend value of symbol of far-end be also more than or equal to 1 with the absolute value of value, then measurement and control center judges to come in contact in this self coupling section n' net T to negative feeder F short trouble, or comes in contact net T and negative feeder F short trouble over the ground simultaneously; Measurement and control center makes the contact line circuit breaker KT at this self coupling section n' two ends n'a, KT n'b and negative feeder circuit breaker KF n'a, KF n'the equal separating brake of b, then overlap, successful reclosing, then recover normal;
Reclosing failure, then make that this self coupling section n' is near, the contact line circuit breaker KT of far-end n'a, KT n'b and negative feeder circuit breaker KF n'a, KF n'b is separating brake again; Meanwhile, one end that this self coupling section n' is near, far-end short circuit currents is larger is selected by measurement and control center, and by the autotransformer AT nearest with this end n'or AT (n'+1)this end current value of the contact line magnitude of voltage located, negative feeder magnitude of voltage and contact line calculates short-circuit reactance, and total reactance in contact line T and negative feeder F loop in this self coupling section n', then show that short circuit trouble point is apart from this autotransformer AT by the length that the ratio of short-circuit reactance and this total reactance is multiplied by this self coupling section n' n'or AT (n'+1)distance.
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