CN108054739B - A kind of overhead transmission line feeder automation method and system based on negative-sequence current - Google Patents

A kind of overhead transmission line feeder automation method and system based on negative-sequence current Download PDF

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Publication number
CN108054739B
CN108054739B CN201711367221.2A CN201711367221A CN108054739B CN 108054739 B CN108054739 B CN 108054739B CN 201711367221 A CN201711367221 A CN 201711367221A CN 108054739 B CN108054739 B CN 108054739B
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switch
block switch
fault
ftu
sequence current
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CN108054739A (en
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吴炬卓
高紫建
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Zhuhai Power Supply Bureau of Guangdong Power Grid Co Ltd
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Zhuhai Power Supply Bureau of Guangdong Power Grid Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/263Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values

Abstract

The present invention relates to the technical fields of distribution automation system, more specifically, it is related to a kind of overhead transmission line feeder automation method and system based on negative-sequence current, pass through adjacent automatization terminal interaction fault negative-sequence current information, fault negative sequence current is detected according to fault point source side, load side does not detect that fault negative sequence current principle carries out localization of fault, fast implements power distribution network and quickly isolates failure and fast recovery of power supply;In fault treating procedure, since the movement of substation's outlet switch reclosing is primary, fault point source side block switch is overlapped once, and then shortens fault handling time, reduces the number of shocks to power grid.When fiber optic communication condition does not have, using communication.Since interactive information is limited between two neighboring terminal and information content is few, the requirement to communication is reduced.

Description

A kind of overhead transmission line feeder automation method and system based on negative-sequence current
Technical field
The present invention relates to the technical fields of distribution automation system, more particularly, to a kind of frame based on negative-sequence current Ceases to be busy road feeder automation method and system.
Background technique
Distribution automation expands supplying power allocation ability, to realization distribution web, high efficiency for improving distribution network reliability Economical operation has the function of stronger promotion.Feeder automation is to realize to match as function most important in distribution automation Power grid quickly isolates the effective means of failure and fast power restoration, and operating condition generates the implementation result of distribution automation straight Connect influence.
Currently, overhead transmission line failure, this automatic mode mainly is isolated using voltage-time type feeder automation mode Main website participation is not needed, the action logic and time coordination of automatic Switching, voltage-time type feeder automation are only relied on It realizes isolated fault on the spot, replys the function of non-faulting block supply.However, substation occurs during isolated fault Switch needs reclosing movement twice, and the Fault Isolation time is long, and forms repeat impact to power grid.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of overhead transmission line feeder line based on negative-sequence current Automatic method and system can be realized power distribution network isolated fault and fast power restoration, and can shorten fault handling time, subtract Few number of shocks to power grid.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of overhead transmission line feeder automation method based on negative-sequence current is provided, which comprises the following steps:
S1. it establishes voltage-vs-time feeder automation model, including block switch group and is connected to block switch group two The substation outlet switch CB1 and substation outlet switch CB2 at end, the block switch group include n segmentation being linked in sequence Switch FS1、FS2、…、FSn;It further include interconnection switch LS, interconnection switch LS is set to i-th of block switch FSiIt is segmented with j-th Switch FSjBetween, j=i+1;Block switch FS1、FS2、…、FSnOn be connected separately with automatization terminal FTU1、FTU2、…、 FTUn, automatization terminal FTU1、FTU2、…、FTUnIt is connect with system main website;
S2. when overhead transmission line breaks down, the first substation outlet switch CB1 detects fault current movement tripping, Block switch between the first substation outlet switch CB1 and interconnection switch LS is because of FS1、FS2、…、FSiDecompression and separating brake;
S3. after reclosing is delayed, first substation's outlet switch CB1 reclosing, block switch FS1It must press, automatically Change terminal FTU1To automatization terminal FTU2It transmits and asks whether to detect fault negative sequence current signal;
If S4. automatization terminal FTU2Detect that fault negative sequence current signal, system main website control block switch FS1It closes Lock, block switch FS2It must press, automatization terminal FTU2To automatization terminal FTU adjacent thereto3It transmits and asks whether to detect Fault negative sequence current signal;Poll is until automatization terminal transmits inquiry and learns and block switch FSpThe automation of connection Terminal FTUpFault negative sequence current signal is not detected, then judges fault point in block switch FSp-1With block switch FSpBetween;
S5. system main website controls block switch FSp-1With block switch FSpIt is latched in open position and reaches isolated fault Purpose;Meanwhile interconnection switch LS failure side decompression, automatization terminal connected to it is to automatization terminal FTUpTransmitting inquiry is It is no to detect fault negative sequence current, as confirmation automatization terminal FTUpWhen not detecting fault negative sequence current, the control of system main website Interconnection switch LS automatic closing processed restores block switch FSpBack segment perfects the power supply of circuit.
The present invention also provides a kind of overhead transmission line feed line automatization system based on negative-sequence current, including block switch group And it is connected to the substation outlet switch CB1 and substation outlet switch CB2 at block switch group both ends, the segmentation is opened Pass group includes several block switch FS for capableing of automatic divide-shut brake, several block switch FS sequential connections;It further include contact Between two groups of adjacent block switch FS, the interconnection switch LS and several segmentations are opened by switch LS, the interconnection switch LS Close automatization terminal FTU, the automatization terminal FTU and the system being respectively connected on FS for detecting fault negative sequence current Master station communication connects, and communicates to connect between adjacent automatization terminal FTU, the automatization terminal FTU and the block switch FS Connection.
Overhead transmission line feeder automation method and system based on negative-sequence current of the invention, it is whole by adjacent automation Interaction fault negative-sequence current information is held, detects that fault negative sequence current, load side do not detect event according to fault point source side Hinder negative-sequence current principle and carry out localization of fault, fast implements power distribution network and quickly isolate failure and fast recovery of power supply;In event Hinder in treatment process, since the movement of substation's outlet switch reclosing is primary, fault point source side block switch is overlapped once, into And shorten fault handling time, reduce the number of shocks to power grid.
Preferably, automatization terminal FTU control block switch FS after substation's outlet switch CB1 reclosing by First delay time limit XFAutomatic closing.When the information for obtaining the adjacent automatization terminal FTU of downlink and detecting fault negative sequence current Afterwards, block switch FS is by the first delay time limit XFAutomatic closing is reduced without the participation of system main website to communication It is required that.
Preferably, automatization terminal FTU control interconnection switch LS after substation's outlet switch CB1 reclosing by Second delay time limit XLAutomatic closing.When confirming that one of automatization terminal FTU does not detect failure with interconnection switch LS After negative-sequence current, interconnection switch LS is by the second delay time limit XLAutomatic closing afterwards restores this and does not detect failure negative phase-sequence electricity The power supply of the block switch FS back segment sound circuit of stream.
Preferably, the first delay time limit XFLess than the second delay time limit XL.Setting is to ensure failure in this way The block switch FS of point two sides can be latched in open position simultaneously, and then achieve the purpose that isolated fault.
Preferably, the feeder automation is using voltage-time type feeder automation mode.Power distribution network is in exception In the case of, conventional voltage-time type feeder automation is switched to, realizes slow-action type intelligent distribution type feeder automation.
Preferably, connection is wirelessly communicated between adjacent automatization terminal FTU.Do not have situation in fiber optic communication condition Under, using communication.Since interactive information is limited between two neighboring terminal and information content is few, reduce to communication It is required that.
Preferably, overhead transmission line feed line automatization system includes five sequentially connected block switch FS, and the contact is opened LS is closed to be set between second block switch and third block switch.
Compared with prior art, the beneficial effects of the present invention are:
Overhead transmission line feeder automation method and system based on negative-sequence current of the invention, it is whole by adjacent automation Interaction fault negative-sequence current information between end detects that fault negative sequence current, load side do not detect according to fault point source side Localization of fault is carried out to fault negative sequence current principle;In fault treating procedure, since substation's outlet switch reclosing acts Once, source side block switch in fault point is overlapped primary, and then shortens fault handling time, reduces the impact time to power grid Number;When fiber optic communication condition does not have, using communication.Due to interactive information be limited to two neighboring terminal it Between and information content it is few, reduce the requirement to communication.In communication abnormality, conventional voltage-vs-time can be automatically switched to Type feeder automation mode.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the overhead transmission line feed line automatization system based on negative-sequence current.
Specific embodiment
The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration, What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent;Reality in order to better illustrate the present invention Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product;To those skilled in the art For, the omitting of some known structures and their instructions in the attached drawings are understandable.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention;It is retouched in of the invention In stating, it is to be understood that if the orientation or positional relationship for having the instructions such as term " on ", "lower", "left", "right" is based on attached drawing Shown in orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion is signified Device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore positional relationship is described in attached drawing Term only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment one
Overhead transmission line feeder automation method based on negative-sequence current of the invention, comprising the following steps:
S1. it establishes voltage-vs-time feeder automation model, including block switch group and is connected to block switch group two The substation outlet switch CB1 and substation outlet switch CB2 at end, the block switch group include n segmentation being linked in sequence Switch FS1、FS2、…、FSn;It further include interconnection switch LS, interconnection switch LS is set to i-th of block switch FSiIt is segmented with j-th Switch FSjBetween, j=i+1;Block switch FS1、FS2、…、FSnOn be connected separately with automatization terminal FTU1、FTU2、…、 FTUn, automatization terminal FTU1、FTU2、…、FTUnIt is connect with system main website;
S2. when overhead transmission line breaks down, the first substation outlet switch CB1 detects fault current movement tripping, Block switch between the first substation outlet switch CB1 and interconnection switch LS is because of FS1、FS2、…、FSiDecompression and separating brake;
S3. after reclosing is delayed, first substation's outlet switch CB1 reclosing, block switch FS1It must press, automatically Change terminal FTU1To automatization terminal FTU2It transmits and asks whether to detect fault negative sequence current signal;
If S4. automatization terminal FTU2Detect that fault negative sequence current signal, system main website control block switch FS1It closes Lock, block switch FS2It must press, automatization terminal FTU2To automatization terminal FTU adjacent thereto3It transmits and asks whether to detect Fault negative sequence current signal;Poll is until automatization terminal transmits inquiry and learns and block switch FSpThe automation of connection Terminal FTUpFault negative sequence current signal is not detected, then judges fault point in block switch FSp-1With block switch FSpBetween;
S5. system main website controls block switch FSp-1With block switch FSpIt is latched in open position and reaches isolated fault Purpose;Meanwhile interconnection switch LS failure side decompression, automatization terminal connected to it is to automatization terminal FTUpTransmitting inquiry is It is no to detect fault negative sequence current, as confirmation automatization terminal FTUpWhen not detecting fault negative sequence current, the control of system main website Interconnection switch LS automatic closing processed restores block switch FSpBack segment perfects the power supply of circuit.
The overhead transmission line feeder automation method based on negative-sequence current of the present embodiment is handed over by adjacent automatization terminal Mutual fault negative sequence current information detects that fault negative sequence current, load side do not detect that failure is negative according to fault point source side Sequence electric current principle carries out localization of fault, fast implements power distribution network and quickly isolates failure and fast recovery of power supply;At failure During reason, since the movement of substation's outlet switch reclosing is primary, fault point source side block switch is overlapped once, and then is contracted Short fault handling time reduces the number of shocks to power grid.
It is as shown in Figure 1 the structural schematic diagram of the overhead transmission line feed line automatization system of the invention based on negative-sequence current, Including block switch group and it is connected to the substation outlet switch CB1 and substation's outlet switch at block switch group both ends CB2, the block switch group include several block switch FS for capableing of automatic divide-shut brake, and several block switch FS sequences connect It connects;It further include interconnection switch LS, the interconnection switch LS is set between two groups of adjacent block switch FS, the interconnection switch LS And the automatization terminal FTU for detecting fault negative sequence current, the automatization terminal are respectively connected on several block switch FS FTU is connect with the system master station communication, is communicated to connect between adjacent automatization terminal FTU, the automatization terminal FTU and institute State block switch FS connection.
Wherein, automatization terminal FTU controls block switch FS and prolongs after substation's outlet switch CB1 reclosing by first When time limit XFAutomatic closing;Automatization terminal FTU controls interconnection switch LS after substation's outlet switch CB1 reclosing by the Two delay time limit XLAutomatic closing;First delay time limit XFLess than the second delay time limit XL.When obtaining, the adjacent automation of downlink is whole After end FTU detects the information of fault negative sequence current, block switch FS is by the first delay time limit XFAutomatic closing, without The participation of system main website reduces the requirement to communication;Do not have when with the one of automatization terminal FTU of interconnection switch LS confirmation After detecting fault negative sequence current, interconnection switch LS is by the second delay time limit XLAutomatic closing afterwards restores this and does not detect The power supply of the block switch FS back segment sound circuit of fault negative sequence current.In addition, power distribution network in an exceptional case, switches to often Slow-action type intelligent distribution type feeder automation is realized in the voltage-time type feeder automation of rule.
The overhead transmission line feed line automatization system based on negative-sequence current of the present embodiment, including five sequentially connected segmentations Switch FS1, FS2, FS3, FS4, FS5 and five automatization terminal FTU1 being connect respectively with FS1, FS2, FS3, FS4, FS5, FTU2 、FTU3、 FTU4、 FTU5。
The specific working principle is as follows for the present embodiment:
When a point breaks down, by taking a point betides between block switch FS2 and block switch FS3 as an example, substation goes out Movement tripping when wiretap CB1 detects fault current, then, block switch FS1, FS2 and block switch FS3 divide because of decompression Lock.At this point, the terminal of block switch FS1 and FS2 detect fault negative sequence current, and block switch FS3 and interconnection switch LS Terminal does not detect fault negative sequence current.After the delay of first time reclosing, substation outlet switch CB1 is overlapped, segmentation Switch FS1 must be pressed and its automatization terminal FTU1 is transmitted to the automatization terminal FTU2 of block switch FS2 and asked whether to detect Fault negative sequence current.After the automatization terminal FTU2 for obtaining block switch FS2 detects the information of fault negative sequence current, segmentation Switch FS1 is by delay XFTime limit automatic closing;Block switch FS2 must be pressed and the automatization terminal of block switch FS2 immediately FTU2 is transmitted to the automatization terminal FTU3 of block switch FS3 and is asked whether to detect fault negative sequence current, is opened when obtaining segmentation After the automatization terminal FTU3 of pass FS3 does not detect the information of fault negative sequence current, then judge fault point in block switch FS2 Between block switch FS3, block switch FS2 and block switch FS3 will be latched in open position simultaneously, and then reach isolation event The purpose of barrier.At the same time, when interconnection switch LS failure side decompression, corresponding automatization terminal is sent out to block switch FS3 Letter asks whether to detect fault negative sequence current, when the automatization terminal FTU3 for obtaining block switch FS3 does not detect failure After the information of negative-sequence current, interconnection switch LS is by delay XLAutomatic closing after time limit restores block switch FS3 back segment and perfects line The power supply on road.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention Protection scope within.

Claims (5)

1. a kind of overhead transmission line feeder automation method based on negative-sequence current, which comprises the following steps:
S1. voltage-vs-time feeder automation model is established, including block switch group and is connected to block switch group both ends Substation outlet switch CB1 and substation outlet switch CB2, the block switch group include n block switch being linked in sequence FS1、FS2、…、FSn;It further include interconnection switch LS, interconnection switch LS is set to i-th of block switch FSiWith j-th of block switch FSjBetween, wherein j=i+1;Block switch FS1、FS2、…、FSnOn be connected separately with automatization terminal FTU1、FTU2、…、 FTUn, automatization terminal FTU1、FTU2、…、FTUnIt is connect with system main website;
S2. when overhead transmission line breaks down, the first substation outlet switch CB1 detects fault current movement tripping, is set to Block switch FS between first substation outlet switch CB1 and interconnection switch LS1、FS2、…、FSiSeparating brake due to decompression;
S3. after reclosing is delayed, first substation's outlet switch CB1 reclosing, block switch FS1It must press, automation is eventually Hold FTU1To automatization terminal FTU2It transmits and asks whether to detect fault negative sequence current signal;
If S4. automatization terminal FTU2Detect that fault negative sequence current signal, system main website control block switch FS1It closes a floodgate, point Duan Kaiguan FS2It must press, automatization terminal FTU2To automatization terminal FTU adjacent thereto3It transmits and asks whether to detect that failure is negative Sequence current signal;Poll is until automatization terminal transmits inquiry and learns and block switch FSpThe automatization terminal FTU of connectionp Fault negative sequence current signal is not detected, then judges fault point in block switch FSp-1With block switch FSpBetween;
S5. system main website controls block switch FSp-1With block switch FSpIt is latched in open position and achievees the purpose that isolated fault; Meanwhile interconnection switch LS failure side decompression, automatization terminal connected to it is to automatization terminal FTUpIt transmits and asks whether to examine Fault negative sequence current is measured, as confirmation automatization terminal FTUpWhen not detecting fault negative sequence current, system main website control connection Network switch LS automatic closing restores block switch FSpBack segment perfects the power supply of circuit.
2. a kind of feed line automatization system using claim 1 the method, which is characterized in that including block switch group and It is connected to the substation outlet switch CB1 and substation outlet switch CB2 at block switch group both ends, the block switch group Including several block switch FS for capableing of automatic divide-shut brake, several block switch FS sequential connections;It further include interconnection switch LS, the interconnection switch LS are set between two groups of adjacent block switch FS, the interconnection switch LS and several block switch FS On be respectively connected with automatization terminal FTU, the automatization terminal FTU for detecting fault negative sequence current and the system main website It communicates to connect, is communicated to connect between adjacent automatization terminal FTU, the automatization terminal FTU is connect with the block switch FS;
When the automatization terminal FTU control block switch FS is delayed after substation's outlet switch CB1 reclosing by first Limit XFAutomatic closing;Automatization terminal FTU control interconnection switch LS is after substation's outlet switch CB1 reclosing by the Two delay time limit XLAutomatic closing;The first delay time limit XFLess than the second delay time limit XL
3. feed line automatization system according to claim 2, which is characterized in that the feeder automation is using electricity Pressure-time type feeder automation mode.
4. feed line automatization system according to claim 2, which is characterized in that nothing between adjacent automatization terminal FTU Line communication connection.
5. according to the described in any item feed line automatization systems of claim 2 to 4, which is characterized in that be sequentially connected with including five Block switch FS, the interconnection switch LS is set between second block switch and third block switch.
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