CN102073001B - Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line - Google Patents
Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line Download PDFInfo
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- CN102073001B CN102073001B CN 201010562686 CN201010562686A CN102073001B CN 102073001 B CN102073001 B CN 102073001B CN 201010562686 CN201010562686 CN 201010562686 CN 201010562686 A CN201010562686 A CN 201010562686A CN 102073001 B CN102073001 B CN 102073001B
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Abstract
The invention discloses a method for locating a fault point of an operation failure of a residual current protection device in a low-voltage distribution line, which improves fault point location efficiency and shortens location time. The method comprises the following steps: judging whether the residual current protection device is at fault; if not, judging whether a phase line and a neutral line of a low-voltage distribution line are at fault; and carrying out rapid judgment and location on the fault point according to the golden section method. The method disclosed by the method takes full use of the function of a residual current clamp meter.
Description
Technical field
The present invention relates to a kind of method of searching the low-voltage distributing line fault, relate in particular to a kind of can't the put into operation reason of fault of Aftercurrent protecting equipment in the low-voltage network, method of fast finding leak current fault point analyzed.
Background technology
It is the effective measures that prevent from causing because of residual current of low-voltage power grid fault harm that Aftercurrent protecting equipment is installed.According to DLT499 " rural area low-voltage power technical regulation " regulation, China's vast rural area low-tension network overwhelming majority adopts TT system low-voltage distribution line leading-out terminal must install Aftercurrent protecting equipment.With regard to present circumstances, the rural power grids dielectric level is poor, and the user realizes thin, and residual current is excessive, thereby often causes that this device can't put into operation, and affects the normal power supply operation of circuit.
The at present operation maintenance work of low-voltage distributing line leading-out terminal Aftercurrent protecting equipment accounts for the very large proportion of power supply station's routine work amount, and this installs once motion, and supplier of electricity can subtract the reduction power supply reliability, and few delivery increases maintenance cost.The fast finding Aftercurrent protecting equipment trouble spot of can't putting into operation, it is necessary to fix a breakdown.
Summary of the invention
The invention provides a kind of can't put into operation method of trouble spot of low-voltage distributing line Aftercurrent protecting equipment of searching, improve the fault recall rate, improve power supply reliability.
The technical solution used in the present invention is: search can't the put into operation method of fault of low-voltage distributing line Aftercurrent protecting equipment:
The first step, judgement is Aftercurrent protecting equipment faults itself or the fault of protected circuit, A phase, B phase, C phase, the outlet of N line of the circuit that do not put into operation are disconnected, if Aftercurrent protecting equipment can not bringing normally into operation, prove that then fault goes out at Aftercurrent protecting equipment itself, the replacing Aftercurrent protecting equipment gets final product, if Aftercurrent protecting equipment energy bringing normally into operation proves that then fault goes out on protected circuit;
Second step is judged as after the protected circuit fault, carries out the fault phase line and judges, A phase, B phase, the phase-splitting of C phase line of the circuit that do not put into operation are connected separately, if connect certain mutually after, Aftercurrent protecting equipment can not bringing normally into operation, proves that then this phase circuit has leak current fault; After if three-phase is all connected, the total protective device of residual current can not bringing normally into operation, proves that then the neutral line has leak current fault, and disconnect A phase, B phase, C phase line this moment, measures the outlet neutral line with split-core type meter, if non-metering, the double earth-fault of attaching most importance to; If reading is arranged, for the multiple power supplies neutral line is used fault with;
The 3rd step, after judging protected circuit and being the phase line fault, carrying out the trouble spot searches, the fault phase line is switched on separately, the outlet of other phases and the outlet of the neutral line must disconnect, simultaneously with pincers types reometer this mutually each take-off point measure, when reading during greater than specified electric leakage working value, the trouble spot is namely behind this take-off point;
The 4th step, judge as after the neutral line multiple grounding fault, carrying out the trouble spot searches, outlet A phase, B phase, C phase line and the neutral line are disconnected, and switch on after the neutral line that disconnects being connected in series the bulb of suitable wattage, simultaneously with pincers types reometer this mutually each take-off point measure, when reading during greater than specified electric leakage working value, the trouble spot is namely behind this take-off point;
The 5th step, judge as after neutral line multichannel uses fault with, carrying out the trouble spot searches, A phase, B phase, C phase line three-phase are disconnected, the neutral line can not disconnect, simultaneously with pincers types reometer this mutually each take-off point measure, when reading during greater than specified electric leakage working value, the trouble spot is namely behind this take-off point.
The present invention when checking, but when having the very little and protector of reading numerical value to work such as clamp on amperemeter, faint electric leakage has been described, do not affect normal power supply, can ignore.The present invention is a kind of system science effective method, has improved widely the fault recall rate, has improved power supply reliability.
Description of drawings
Fig. 1 is that distribution line phase line leak current fault of the present invention is judged synoptic diagram.
Fig. 2 is that supply line of the present invention neutral line outlet fault is judged synoptic diagram.
Fig. 3 is that multiple grounding of the present invention or the multiple power supplies neutral line are used fault judgement synoptic diagram with.
Fig. 4 is the phase line trouble spot judging synoptic diagram that carries out of the present invention.
Fig. 5 is neutral line multiple grounding trouble spot judging synoptic diagram of the present invention.
Fig. 6 is that neutral line multichannel of the present invention is used the trouble spot judging synoptic diagram with.
Embodiment
Below in conjunction with accompanying drawing the present invention is specifically described.
Fig. 1, distribution line phase line leak current fault is judged.Only with A phase outlet energising, other phase lines and the neutral line disconnect, and at this moment, check whether Aftercurrent protecting equipment RCD works, if normal operation, A phase outlet non-fault; If cisco unity malfunction, the outlet of A phase has fault.Check according to the method described above B, the outlet of C phase.
Fig. 2, supply line's neutral line outlet fault is judged.After above-mentioned having checked, when A, B, the equal non-fault of C three-phase outlet, A, B, the energising of C three-phase check whether Aftercurrent protecting equipment works simultaneously, if normal operation, neutral line non-fault; If cisco unity malfunction, the neutral line has fault.
Fig. 3, multiple grounding or the multiple power supplies neutral line use fault with and judge.After above-mentioned having checked, judge that the neutral line has fault, A, B, C three-phase are disconnected, the outlet neutral line does not disconnect, and measures the outlet neutral line with split-core type meter simultaneously, if non-metering, the double earth-fault of attaching most importance to; If reading is arranged, for the multiple power supplies neutral line is used fault with.
Fig. 4 after finishing the judgement of figure one distribution line phase line leak current fault, after the affirmation phase line has fault, carries out the phase line trouble spot judging.With mutually separately energising of A, other reach mutually the outlet neutral line and disconnect.According to Fibonacci method, at first at the take-off point L of circuit
1The place, with pincerlike meter clamp respectively into 1,2,3 of charged phase line judging the electric leakage position, if pincers enter at 1 when front, the residual current pincerlike meter has the electric current indication, proves that then leak current fault is after 1 o'clock; If pincers enter or at 2 at 3 when front, the residual current pincerlike meter has the electric current index, proves that then leak current fault respectively on or 3 later circuits, by that analogy, dwindles sensing range at 2.Check according to the method described above B, C phase supply line.
Fig. 5, neutral line multiple grounding trouble spot judging.The outlet neutral line and A, B, C three-phase are all disconnected, and the neutral line that disconnects is connected in series the incandescent lamp energising of suitable wattage.According to Fibonacci method, at first at the take-off point L of circuit
1The place, with the residual current pincerlike meter clamp respectively into 1,2,3 of the charged neutral line judging the multiple grounding position of failure point, if pincers enter at 1 when front, the residual current pincerlike meter has electric current to indicate, and proves that then multiple grounding trouble spot fault is after 1 o'clock; If pincers enter or at 2 at 3 when front, the residual current pincerlike meter has the electric current indication, proves that then multiple grounding trouble spot fault respectively on or 3 later circuits, by that analogy, dwindles sensing range at 2.
Fig. 6, after finishing Fig. 3 " multiple grounding or the multiple power supplies neutral line are used fault with and judged ", affirmation neutral line multichannel is used with, carries out neutral line multichannel and uses trouble spot judging with.A, B, C three-phase are disconnected, and the neutral line can't disconnect, and might use with this circuit the All other routes normal power-up of center line with.According to Fibonacci method, at first at the take-off point L of circuit
1The place clamps respectively into 1,2,3 of the neutral line with the residual current pincerlike meter that if pincers enter at 1 when front, the residual current pincerlike meter has electric current to indicate judging that multichannel uses abort situation with, proves that then multichannel uses fault with after 1 o'clock; If pincers enter or at 2 at 3 when front, detector has the electric current indication, proves that then multichannel uses fault with respectively on or 3 later circuits at 2, by that analogy, dwindles sensing range.
Specifically; the present invention searches rapidly can't the put into operation method of trouble spot of low-voltage distributing line Aftercurrent protecting equipment; the first step; judgement is Aftercurrent protecting equipment faults itself or the fault of protected circuit; A phase, B phase, C phase, the outlet of N line of the circuit that do not put into operation are disconnected; if Aftercurrent protecting equipment can not bringing normally into operation; prove that then fault goes out at Aftercurrent protecting equipment itself; the replacing Aftercurrent protecting equipment gets final product; if Aftercurrent protecting equipment energy bringing normally into operation proves that then fault goes out on protected circuit.
Second step, confirm as the protected circuit fault after, carry out the fault phase line and judge.Only with A phase outlet energising, other phase lines and the neutral line disconnect, and at this moment, check whether Aftercurrent protecting equipment works, if normal operation, A phase outlet non-fault; If cisco unity malfunction, the outlet of A phase has fault.Check according to the method described above B, the outlet of C phase.See accompanying drawing 1.
Supply line's neutral line outlet fault is judged.After above-mentioned having checked, A, B during the equal non-fault of C three-phase outlet, gives A, B, the energising of C three-phase simultaneously, checks whether Aftercurrent protecting equipment works, if normal operation, neutral line non-fault; If cisco unity malfunction, the neutral line has fault.See accompanying drawing 2.
Multiple grounding or the multiple power supplies neutral line are used fault with and are judged.After above-mentioned having checked, judge that the neutral line has fault, A, B, C three-phase are disconnected, the outlet neutral line does not disconnect, and measures the outlet neutral line with split-core type meter simultaneously, if non-metering, the double earth-fault of attaching most importance to; If reading is arranged, for the multiple power supplies neutral line is used fault with.See accompanying drawing 3.
After finishing the judgement of Fig. 1 distribution line phase line leak current fault, after the affirmation phase line has fault, carry out the phase line trouble spot judging.With mutually separately energising of A, other reach mutually the outlet neutral line and disconnect.According to Fibonacci method, at first at the take-off point L of circuit
1The place, with pincerlike meter clamp respectively into 1,2,3 of charged phase line judging the electric leakage position, if pincers enter at 1 when front, the residual current pincerlike meter has the electric current indication, proves that then leak current fault is after 1 o'clock; If pincers enter or at 2 at 3 when front, the residual current pincerlike meter has the electric current index, proves that then leak current fault respectively on or 3 later circuits, by that analogy, dwindles sensing range at 2.Check according to the method described above B, C phase supply line.See accompanying drawing 4.
Neutral line multiple grounding trouble spot judging.The outlet neutral line and A, B, C three-phase are all disconnected, and the neutral line that disconnects is switched on by the incandescent lamp of suitable wattage.According to Fibonacci method, at first at the take-off point L of circuit
1The place, with the residual current pincerlike meter clamp respectively into 1,2,3 of the charged neutral line judging the multiple grounding position of failure point, if pincers enter at 1 when front, the residual current pincerlike meter has electric current to indicate, and proves that then multiple grounding trouble spot fault is after 1 o'clock; If pincers enter or at 2 at 3 when front, the residual current pincerlike meter has the electric current indication, proves that then multiple grounding trouble spot fault respectively on or 3 later circuits, by that analogy, dwindles sensing range at 2.See accompanying drawing 5.
After finishing Fig. 3 " multiple grounding or the multiple power supplies neutral line are used fault with and judged ", affirmation neutral line multichannel is used with, carries out neutral line multichannel and uses trouble spot judging with.A, B, C three-phase are disconnected, and the neutral line does not disconnect, and might use with this circuit the All other routes normal power-up of center line with.According to Fibonacci method, at first at the take-off point L1 place of circuit, clamp respectively into 1,2,3 of the neutral line judging that multichannel uses abort situation with, if pincers enter at 1 when front with the residual current pincerlike meter, the residual current pincerlike meter has electric current indication, proves that then multichannel uses fault with after 1 o'clock; If pincers enter or at 2 at 3 when front, detector has the electric current indication, proves that then multichannel uses the fault fault with respectively on or 3 later circuits at 2, by that analogy, dwindles sensing range.Synoptic diagram is seen accompanying drawing 6.This type of fault is uncommon in rural power grids.
The present invention when checking, but when having the very little and protector of reading numerical value to work such as clamp on amperemeter, faint electric leakage has been described, do not affect normal power supply, can ignore.The present invention is a kind of system science effective method, has improved widely the fault recall rate, has improved power supply reliability.
Claims (1)
1. search can't the put into operation method of fault of low-voltage distributing line Aftercurrent protecting equipment for one kind, it is characterized in that:
The first step, judgement is Aftercurrent protecting equipment faults itself or the fault of protected circuit, A phase, B phase, C phase, the outlet of N line of the circuit that do not put into operation are disconnected, if Aftercurrent protecting equipment can not bringing normally into operation, prove that then fault goes out at Aftercurrent protecting equipment itself, the replacing Aftercurrent protecting equipment gets final product, if Aftercurrent protecting equipment energy bringing normally into operation proves that then fault goes out on protected circuit;
Second step is judged as after the protected circuit fault, carries out the fault phase line and judges, A phase, B phase, the phase-splitting of C phase line of the circuit that do not put into operation are connected separately, if connect certain mutually after, Aftercurrent protecting equipment can not bringing normally into operation, proves that then this phase circuit has leak current fault; After if three-phase is all connected, the total protective device of residual current can not bringing normally into operation, proves that then the neutral line has leak current fault, and disconnect A phase, B phase, C phase line this moment, measures the outlet neutral line with split-core type meter, if non-metering, the double earth-fault of attaching most importance to; If reading is arranged, for the multiple power supplies neutral line is used fault with;
The 3rd step, after judging protected circuit and being the phase line leak current fault, carrying out the trouble spot searches, the fault phase line is switched on separately, the outlet of other phases and the outlet of the neutral line must disconnect, measure at each take-off point of the phase line that leak current fault occurs with pincers types reometer simultaneously, when reading during greater than specified electric leakage working value, the trouble spot is namely behind this take-off point;
The 4th step, judge as after the neutral line multiple grounding fault, carrying out the trouble spot searches, outlet A phase, B phase, C phase line and the neutral line are disconnected, and switch on after the neutral line that disconnects being connected in series the bulb of suitable wattage, measure at each take-off point of the neutral line with pincers types reometer simultaneously, when reading during greater than specified electric leakage working value, the trouble spot is namely behind this take-off point;
The 5th step, judge as after the multiple power supplies neutral line uses fault with, carrying out the trouble spot searches, A phase, B phase, C phase line three-phase are disconnected, the neutral line can not disconnect, measure at each take-off point of the neutral line with pincers types reometer simultaneously, when reading during greater than specified electric leakage working value, the trouble spot is namely behind this take-off point.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010562686 CN102073001B (en) | 2010-11-29 | 2010-11-29 | Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line |
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| CN 201010562686 CN102073001B (en) | 2010-11-29 | 2010-11-29 | Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line |
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| CN102073001A CN102073001A (en) | 2011-05-25 |
| CN102073001B true CN102073001B (en) | 2013-01-02 |
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| CN103777108B (en) * | 2013-10-24 | 2017-08-25 | 黄政 | A kind of method of quick lookup electrical equipment grounding trouble point |
| CN106099714B (en) * | 2016-06-20 | 2018-06-22 | 深圳供电局有限公司 | A kind of 3/2nds mode of connection current loops maintenance short-circuit operation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6894478B1 (en) * | 2001-10-26 | 2005-05-17 | E.O. Schweitzer Manufacturing Company, Inc. | Fault indicator with automatically configured trip settings |
| CN1756018A (en) * | 2004-09-14 | 2006-04-05 | Kh控制公司 | Device and method for limiting energy in wiring faults and method for confirming electrical system safety |
| CN2938126Y (en) * | 2006-06-14 | 2007-08-22 | 福建省电力勘测设计院 | Single phase earth monitoring device of low voltage earth-free system |
| CN101039021A (en) * | 2007-01-26 | 2007-09-19 | 西安交通大学 | Novel fault protection process for intelligent circuit breakers |
| CN101042419A (en) * | 2006-03-23 | 2007-09-26 | 田忠孝 | Method for using neutral line distribution circuit fault signal and application thereof |
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2010
- 2010-11-29 CN CN 201010562686 patent/CN102073001B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6894478B1 (en) * | 2001-10-26 | 2005-05-17 | E.O. Schweitzer Manufacturing Company, Inc. | Fault indicator with automatically configured trip settings |
| CN1756018A (en) * | 2004-09-14 | 2006-04-05 | Kh控制公司 | Device and method for limiting energy in wiring faults and method for confirming electrical system safety |
| CN101042419A (en) * | 2006-03-23 | 2007-09-26 | 田忠孝 | Method for using neutral line distribution circuit fault signal and application thereof |
| CN2938126Y (en) * | 2006-06-14 | 2007-08-22 | 福建省电力勘测设计院 | Single phase earth monitoring device of low voltage earth-free system |
| CN101039021A (en) * | 2007-01-26 | 2007-09-19 | 西安交通大学 | Novel fault protection process for intelligent circuit breakers |
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