CN108562819A - The power distribution network small current grounding fault localization method drawn based on layering examination - Google Patents

The power distribution network small current grounding fault localization method drawn based on layering examination Download PDF

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CN108562819A
CN108562819A CN201810293344.4A CN201810293344A CN108562819A CN 108562819 A CN108562819 A CN 108562819A CN 201810293344 A CN201810293344 A CN 201810293344A CN 108562819 A CN108562819 A CN 108562819A
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switch
separating brake
single layer
sequence
fault
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CN108562819B (en
Inventor
李芳芳
杜明田
王波
赵泉刚
薛莉
张南
关永昌
张君
张海城
伊瑞鹏
曹源
崔龙龙
郭芮
卞高敏
赵文利
赵鑫
李红梅
李静
张伟
刘晓亮
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Integrated Electronic Systems Lab Co Ltd
Binzhou Power Supply Co of State Grid Shandong Electric Power Co Ltd
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Integrated Electronic Systems Lab Co Ltd
Binzhou Power Supply Co of State Grid Shandong Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Locating Faults (AREA)

Abstract

The invention discloses a kind of power distribution network small current grounding fault localization method drawn based on layering examination, this method includes：Establish the remote control switch hierarchical mode that distribution net work earthing fault positioning floor switch battle array DFLM describes one feeder line of power distribution network；Establish single layer switch combined floodgate sequence table SLST, the remote control feed motion sequence of description single layer switch；Necessary adjustment is carried out to the switching sequence in single layer switch combined floodgate sequence table SLST；The single layer switch combined floodgate sequence table SLST after floor switch battle array DFLM and adjustment is positioned according to distribution net work earthing fault, layering examination drawing processing is carried out to distribution net work earthing fault, until finding earth fault region.This method configures wider and special ground connection transient-wave acquisition terminal and the less region of signal injection terminal in current power distribution network conventional remote controls terminal has well adapting to property, there is good adaptability especially for high resistance earthing fault judgement, in no remote terminal region, also can try to close a floodgate by scene rush to repair personnel is grounded the positioning of failure.

Description

The power distribution network small current grounding fault localization method drawn based on layering examination
Technical field
The present invention relates to power distribution network small current grounding fault positioning fields, specifically a kind of to be matched based on what layering examination was drawn Power grid small current grounding fault localization method.
Background technology
Power supply reliability is to weigh an important indicator of Utilities Electric Co.'s power supply quality.Feeder automation is as raising The important means of power supply reliability configures extensively in current power distribution automation system main website, and in fault routine processing It plays an important role.
But feeder automation function is higher to the processing reliability of short trouble at present, and to caused by single-phase earthing The processing reliability of small current grounding fault is relatively low.The power distribution network in China, except the more demanding A+ of part power supply reliability Class or A classes area use outside the high current earthing mode of neutral-point solid ground or Neutral Point Through Low Resistance, other big portions Region-by-region still uses the small current neutral grounding mode of isolated neutral or neutral by arc extinction coil grounding.
Currently, the method for power distribution network small current grounding fault positioning is generally divided into two classes, one kind is active technique, Yi Leishi Passive method.So-called active technique, refer to by injecting distinctive signal in substation grounding transformer neutral point or feeder line outlet, Corresponding signal is collected by terminal by comprehensive judgement abort situation, as S injection methods plus letter transfer function method, port failure are examined Disconnected method etc..Such method need to install special signal generator additional, and need to coordinate to detect corresponding signal with special terminal.It is so-called Passive method, refer to by extract failure occur the moment before and after transient state or steady state characteristic amount, and through comparison analysis so that it is determined that Abort situation, such as zero sequence drying method, power direction method, than width phase comparing method, negative-sequence current method, traveling wave positioning mode.Such method It is very high to terminal device acquisition precision and frequency requirement, need separately installed configuration sampling with high precision device and anti-saturation mutual inductor. In addition to high resistance ground all without good processing means, circuit examination draws to try to close is usually current small current neutral grounding localization method Handle the effective ways of such complex fault.
In conclusion either active technique or passive method need special terminal device is installed mostly it is special to coordinate Sample requirement, and the installation that need to have a power failure mostly in addition to fault detector, so further reduced power supply reliability.Have to save The distribution network construction resource of limit, builds a conservation-minded society, and utilizes distribution network automated main station system and current installed end End equipment such as line feed terminals (Feeder Terminal Unit, FTU), stand institute terminal (Distribution Terminal Unit, DTU), the section positioning that is grounded failure such as fault detector there is important practical significance.
Invention content
It is an object of the invention to solve power distribution network small current grounding fault orientation problem to provide in conjunction with power distribution network feature A kind of power distribution network small current grounding fault localization method drawn based on layering examination.
Technical solution for achieving the above object is as follows：
A kind of power distribution network small current grounding fault localization method drawn based on layering examination, this method comprises the following steps：
Step 1 establishes distribution net work earthing fault positioning floor switch battle array DFLM and describes the remote control of one feeder line of power distribution network and opens Close hierarchical mode；
Step 2 establishes the remote control separating brake sequence of movement that single layer switch separating brake sequence table SLOT describes single layer switch；
Step 3, to carrying out necessary adjustment to the switch separating brake sequence in single layer switch separating brake sequence table SLOT；
Step 4 positions the single layer after floor switch battle array DFLM and adjustment according to distribution net work earthing fault and switchs separating brake sequence Table SLOT carries out layering examination drawing processing to distribution net work earthing fault, until finding earth fault region.
Establish the remote control switch layering that distribution net work earthing fault positioning floor switch battle array DFLM describes one feeder line of power distribution network Model, specially：
Wherein, flijFor i-th of the remote control switch title or number in the jth layer of a feeder line, if the switch is not present Value is -1；M is the maximum number of plies of feeder line；N is same layer number of switches maximum value；I is line number, i=1,2 ..., n；J is level number, J=0,1,2 ..., m.
Establish single layer switch separating brake sequence table SLOTjThe remote control separating brake sequence of movement of jth layer switch is described, specially：
SLOTj=[slj1,slj2,slj3,…,sljk,…,sljw]
sljk=flij,iff flij≠-1
Wherein, j is DFLM level numbers, j=m, m-1 ... 2,1,0；I is DFLM line numbers, i=1,2 ..., n；W is the in DFLM J layers of non-1 yuan of prime number, k=1,2 ..., w；Iff is indicated when and is just thought.
To single layer switch separating brake sequence table SLOTjIn switch separating brake sequence be adjusted, specific method is：
1st step, by single layer switch separating brake sequence table SLOTjIn all switches be father node minimum distribution region most Nearly h days earth fault quantity is counted, and puts capable arrangement into according to the descending sequence of number of faults is split, for connecing The identical switch of earth fault quantity carries out the 2nd step and judges；
2nd step, from small to large according to the responsible consumer quantity waited for contained by minimum distribution region of the separating brake switch for father node Sequence is ranked up switch, and carrying out the 3rd step for the identical switch of responsible consumer quantity judges；
3rd step, according to wait for the sequence of separating brake switch load amount from small to large to switch be ranked up, it is identical for load Switch carry out the 4th step judge；
4th step, according to wait for separating brake switch be father node minimum distribution region feeder line type to switch be ranked up, rain Cable after its first overhead line, overhead line after non-rainy day elder generation cable, for it is identical for minimum distribution region feeder line type Switch carries out the 5th step and judges；
5th step, according to wait for separating brake switch be father node minimum distribution region feed line length it is descending sequence it is right Switch is ranked up.
Wherein, h can be general to can use 30 days~365 according to comprehensive selections such as the frequencies of local season and feeder line earth fault It.
It can be excellent according to separating brake by distribution automation system main website after being ranked up to single layer switch separating brake sequence table The sequence of first grade from high to low is remotely controlled separating brake to each of each floor switch and draws road so as to quickly determine earth fault Point.So being based on the specific method that layering draws the power distribution network small current grounding fault on road to position：
(1) earth fault feeder line is determined based on substation grounding route selection result and respective rule, and enters (2) step；
(2) distribution net work earthing fault is established according to Section 1 the method to earth connection and positions floor switch battle array DFLM, and Into (3) step；
(3) according to the descending sequence of row number, the j in floor switch battle array DFLM is taken to arrange, generates single layer and switchs separating brake sequence List SLOTj, and enter (4) step；
(4) separating brake sequence method of adjustment the 1st step to the 5th step is switched to single layer switch separating brake sequence table SLOT according to single layerj In switching sequence be adjusted, and enter (5) step；
(5) by power distribution automation scheduling station system, single layer is taken to switch separating brake sequence by the ascending sequence of row number Table SLOTjIn k-th of switch sljk, it is remotely controlled sub-switching operation, if substation bus bar is grounded abnormal disappearance, table after separating brake Show that earth fault is happened at switch sljkFor in the minimum distribution region of father node, and termination.If substation is female after separating brake Line ground connection is abnormal not to be disappeared, then it represents that failure is not happened at switch sljkFor in the minimum distribution region of father node, and into the (6) step；
(6) (5) step is repeated, then stops handling if it is determined that going out earth fault region, if single layer switchs separating brake sequence table SLOTjIn all switch separating brake complete, then enter (7) step；
(7) (3) to (6) step is repeated, then stops handling if it is determined that going out earth fault region, if Earth design is layered All switch separating brakes in switch arrays DFLM are completed and are not found earth fault region, then it represents that ground connection event does not occur for this feeder line Barrier.
Advantageous effects of the present invention：It establishes distribution net work earthing fault positioning floor switch battle array DFLM and describes power distribution network one The remote control switch hierarchical mode of feeder line；Establish single layer switch separating brake sequence table SLOT describe single layer switch remote control separating brake action it is suitable Sequence；Necessary adjustment is carried out to the switch separating brake sequence in single layer switch separating brake sequence table SLOT；It is fixed according to distribution net work earthing fault Position floor switch battle array DFLM and adjustment after single layer switch separating brake sequence table SLOT to distribution net work earthing fault carry out layering examination draw Processing, until finding earth fault region.This method is temporary in the wider and special ground connection of current power distribution network conventional remote controls terminal configuration State waveform acquisition terminal and the less region of signal injection terminal have well adapting to property, sentence especially for high resistance earthing fault Surely there is good adaptability, in no remote terminal region, also can try pulling lock by scene rush to repair personnel and be grounded failure Positioning.
Description of the drawings
Fig. 1 is typical power distribution network figure.
Specific implementation mode
The present invention will be described in detail below：
(1) first, the remote control that distribution net work earthing fault positioning floor switch battle array DFLM describes one feeder line of power distribution network is established Switch hierarchical mode；
(2) secondly, the remote control separating brake sequence of movement that single layer switch separating brake sequence table SLOT describes single layer switch is established；
(3) then, to carrying out necessary adjustment to the switch separating brake sequence in single layer switch separating brake sequence table SLOT；
(4) finally, the single layer after floor switch battle array DFLM and adjustment is positioned according to distribution net work earthing fault switchs separating brake sequence List SLOT carries out layering examination drawing processing to distribution net work earthing fault, until finding earth fault region.
It is distribution feeder figure shown in Fig. 1, wherein Feeder1, Feeder2 are two distribution feeders hand in hand, and S1, S2 are to become Power station outlet switch, A~S are block switch, and T is interconnection switch, and all switches all have distant control function, and omission does not have remote control The equipment such as functional switch and disconnecting link, fuse switch, distribution transformer, it is assumed that single-phase earthing event occurs for minimum distribution region HJ Barrier.Earth fault, the load that feeder line Feeder1 is respectively switched occurs according to substation line selection apparatus route selection result feeder line Feeder1 As shown in the figure, unit A, each minimum distribution region important load number of feeder line, fault statistics data, feeder line segment type, feedback Line length etc. is as shown in table 1, and weather is fine day without rain state.
The minimum distribution region parameter table of table 1
Structure distribution net work earthing fault positions floor switch battle array DFLM：
According to the specific method that power distribution network small current grounding fault positions, takes the in floor switch battle array DFLM the 7th to arrange and constitute Single layer switchs combined floodgate sequence table SLOT7, and single layer switch combined floodgate sequence table progress sequence is adjusted to according to the 1st step to the 5th step： SLOT7=[O, M, P, N].
Separating brake is carried out to switch O, M, P, N successively and draws road, because busbar grounding is not eliminated extremely, so floor switch need to be taken The 6th, 5,4 row of battle array DFLM carry out above-mentioned processing, are similarly adjusted to single layer switch combined floodgate sequence table progress sequence：
SLOT6=[K, L] SLOT5=[J, I, G] SLOT4=[E, H, D, F]
Separating brake is carried out to switch K, L, J, I, G, E, H, D, F successively and draws road, after to switch H separating brakes, busbar grounding is abnormal It disappearing, then it represents that earth fault is happened at using H in the minimum distribution region HJ of father node, then to carry out separating brake remote control to switch J, Be grounded Fault Isolation, while fault down stream interconnection switch T being closed a floodgate, and by separating brake switch N, M, O, K, L, P, E, G, I according to This, which closes a floodgate, realizes restoration.

Claims (5)

1. the power distribution network small current grounding fault localization method drawn based on layering examination, it is characterised in that：This method includes following step Suddenly：
Step 1 establishes the remote control switch point that distribution net work earthing fault positioning floor switch battle array DFLM describes one feeder line of power distribution network Layer model；
Step 2 establishes the remote control separating brake sequence of movement that single layer switch separating brake sequence table SLOT describes single layer switch；
Step 3 carries out necessary adjustment according to priority to the switch separating brake sequence in single layer switch separating brake sequence table SLOT；
Step 4 positions the single layer after floor switch battle array DFLM and adjustment according to distribution net work earthing fault and switchs separating brake sequence table SLOT carries out layering examination drawing processing to distribution net work earthing fault, until finding earth fault region.
2. the power distribution network small current grounding fault localization method according to claim 1 drawn based on layering examination, feature are existed In：
In step 1, the remote control switch that distribution net work earthing fault positioning floor switch battle array DFLM describes one feeder line of power distribution network is established Hierarchical mode, specially：
Wherein, flijFor i-th of the remote control switch title or number in the jth layer of a feeder line, the value if the switch is not present It is -1；M is the maximum number of plies of feeder line；N is same layer number of switches maximum value；I is line number, i=1,2 ..., n；J is level number, j= 0,1,2,…,m。
3. the power distribution network small current grounding fault localization method according to claim 2 drawn based on layering examination, feature are existed In：
In step 2, single layer switch separating brake sequence table SLOT is establishedjThe remote control separating brake sequence of movement of jth layer switch is described, specifically For：
SLOTj=[slj1,slj2,slj3,…,sljk,…,sljw]
sljk=flij,iff flij≠-1
Wherein, j is DFLM level numbers, j=m, m-1 ... 2,1,0；I is DFLM line numbers, i=1,2 ..., n；W is jth layer in DFLM Non- 1 yuan of prime number, k=1,2 ..., w；Iff is indicated when and is just thought.
4. the power distribution network small current grounding fault localization method according to claim 3 drawn based on layering examination, feature are existed In：
According to priority in step 3, to single layer switch separating brake sequence table SLOTjIn switch separating brake sequence be adjusted, specifically Method is：
1st step, by single layer switch separating brake sequence table SLOTjIn all switches be nearest h days of minimum distribution region of father node Earth fault quantity counted, and put capable arrangement into according to the descending sequence of number of faults is split, for ground connection therefore Hinder the identical switch of quantity and carries out the judgement of the 2nd step；
2nd step, according to wait for separating brake switch be father node minimum distribution region contained by responsible consumer quantity from small to large sequence Switch is ranked up, carrying out the 3rd step for the identical switch of responsible consumer quantity judges；
3rd step, according to wait for the sequence of separating brake switch load amount from small to large to switch be ranked up, opened for load is identical Put the judgement of the 4th step of row into；
4th step, according to waiting for that separating brake switch is that the feeder line type in the minimum distribution region of father node is ranked up switch, the rainy day is first Cable after overhead line, overhead line after non-rainy day elder generation cable, for for the identical switch of minimum distribution region feeder line type Carry out the judgement of the 5th step；
5th step, according to waiting for the descending sequence of feed line length that separating brake switch is the minimum distribution region of father node to switch It is ranked up；
Wherein, h can be general 30 days~365 days desirable according to comprehensive selections such as the frequencies of local season and feeder line earth fault.
5. the power distribution network small current grounding fault localization method according to claim 4 drawn based on layering examination, feature are existed In：
In step 4, floor switch battle array DFLM is positioned based on distribution net work earthing fault, according to the sequence that row number is descending, is taken point J row in layer switch arrays DFLM generate single layer switch separating brake sequence table SLOTj；According to priority to single layer switch separating brake sequence It is adjusted；Single layer switch separating brake sequence table SLOT is taken by the ascending sequence of row numberjIn k-th of switch sljk, carry out distant Sub-switching operation is controlled, if substation bus bar is grounded abnormal disappearance after separating brake, then it represents that earth fault is happened at switch sljkIt is saved for father In the minimum distribution region of point, and termination；It does not disappear if substation bus bar ground connection is abnormal after separating brake, then it represents that failure is not sent out Life is with switch sljkFor in the minimum distribution region of father node, until all in Earth design floor switch battle array DFLM Separating brake is switched to complete.
CN201810293344.4A 2018-04-03 2018-04-03 Power distribution network low-current grounding fault positioning method based on layered trial pull Active CN108562819B (en)

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