CN103746354B - One kind is based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in - Google Patents

One kind is based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in Download PDF

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Publication number
CN103746354B
CN103746354B CN201410007727.2A CN201410007727A CN103746354B CN 103746354 B CN103746354 B CN 103746354B CN 201410007727 A CN201410007727 A CN 201410007727A CN 103746354 B CN103746354 B CN 103746354B
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China
Prior art keywords
intelligent apparatus
panel switches
fault
substation exit
breaker
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Expired - Fee Related
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CN201410007727.2A
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CN103746354A (en
Inventor
顾亭亭
李魏宏
彭森
邢跃春
曹秋伟
赵琴
曹鹏
顾欣欣
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NANJING GWDR RELAYS TECHNOLOGY Co Ltd
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Priority to CN201410007727.2A priority Critical patent/CN103746354B/en
Priority claimed from CN201210168513.4A external-priority patent/CN102709885B/en
Publication of CN103746354A publication Critical patent/CN103746354A/en
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Abstract

The present invention proposes a kind of transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in; which is operated to substation exit breaker using unfixed delay pattern; the appropriate solution of the ground point selection that occurs by failure judgement; so that protection act is more precisely reliable; especially when fault occurs in substation exit proximity to circuit breakers; can tripping substation exit breaker immediately; improve the rapidity of substation exit fault; effective protection power equipment, improves the security of power system.And the invention provides the corresponding time sequential routine, it is ensured that the effective reliable of the inventive method is implemented.Present inventive concept is ingenious, and using effect is good, it is contemplated that will will find broad application in relay protection field.

Description

A kind of transformer station's overcurrent protection power distribution network fault without constant time lag in that is based on is isolated Method
Technical field
Proposed by the present invention is a kind of based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in.
Background technology
In distribution automation system, the quick positioning of fault, isolation are one of most important parts with reconstruct. China's conventional electrical distribution net relay protection typically adopts the step protection mode based on electric current, voltage, according to default setting valve Isolated fault point.
As power distribution network constantly develops, network is increasingly huge and complicated, and the protection of conventional electrical distribution net is it is difficult to ensure that selective And rapidity.In 10KV transformer station of load intensive area power supply distance typically only 3 5km, 3-5 section is divided into by section switch. On so short circuit, using step protections such as traditional excessively stream, overvoltage, distances, setting value order is more and more difficult.As a result It is any point fault on circuit, all possible non-selectivity tripping operation of substation exit breaker, causes full line to have a power failure, causes to join Operation of power networks reliability reduces.See accompanying drawing 1.
Recently, some systems apply power distribution network network protection, using the method for network transmission, so that protection device is obtained Related electric amount and information to beyond mount point, through logic judgment, determines fault section.
Such as Chinese invention patent application " method of the distributed overcurrent protection of power distribution network and phase-to phase fault isolation "(Application Number:20111021552.1), which installs intelligent apparatus at the panel switches, and whether intelligent apparatus can monitor the electric current of panel switches Excessively stream, all intelligent apparatus are communicated by network, and intelligent apparatus are transmitted by local collection information and other intelligent apparatus Cross stream information judging whether phase fault occurs in panel switches downstream on distribution line, and disconnect accordingly and joining Electric switch.
But network protection must be cooperated in time with substation exit breaker protection, otherwise substation exit Breaker still can trip.The measure that takes at present be extend outlet breaker operating time of protection, reserve 200ms time delay to Network protection is entered row information and is exchanged and Fault Isolation.This is meant that in substation exit short circuit, it is also necessary to through time delay ability Isolated fault.
But distribution network system short circuit current level is higher at present, even if or even the no-delay tripping operation change of some transformer station's protections Depressor can also be damaged, it has to install current-limiting reactor on substation line additional, to reduce short circuit current.For realizing power distribution network guarantor The network protection of the selectivity design of shield, sometimes makes the isolation of substation exit fault lose rapidity, will threaten electric power Equipment, the safety of power system.
Content of the invention
The technical problem to be solved in the present invention is:Overcome the above-mentioned deficiency of prior art, provide a kind of based on transformer station's mistake The distribution network fault isolation method of current protection.
In order to solve above technical problem, the present invention provide based on transformer station's overcurrent protection nothing constant time lag distribution Net failure separation method, distribution automation system composition include:Substation exit breaker, panel switches, substation exit The intelligent apparatus of breaker and the intelligent apparatus of panel switches, all intelligent apparatus pass through network communication, it is characterised in that:
When intelligent apparatus judge that fault occurs on the distribution line between panel switches, then the arbitrary distribution in fault upstream is opened The intelligent apparatus of pass send block signal in the T1 moment to the intelligent apparatus of this side substation exit breaker, while the fault The intelligent apparatus of both sides panel switches send trip signal to panel switches;The intelligent apparatus of this side substation exit breaker (Its intrinsic actuation time is adjusted to T4)After receiving the block signal, protection is returned immediately, and arranges the time delay of T5 automatically, During the time delay, substation exit breaker intelligent apparatus do not send out trip signal to substation exit breaker;When fault two Side panel switches tripping operation is finished, and the intelligent apparatus of section switch send combined floodgate order, after section switch closes a floodgate, segmentation open circuit The distribution line of device upstream is powered by offside transformer station;
When intelligent apparatus judge that fault occurs between panel switches and this side substation exit breaker, this side transformer station The intelligent apparatus of outlet breaker and fault down stream send trip signal adjacent to the intelligent apparatus of panel switches;When this side power transformation Stand outlet breaker and fault down stream is finished adjacent to panel switches tripping operation, and the intelligent apparatus of section switch send combined floodgate order, After section switch closes a floodgate, the distribution line of section switch upstream is powered by offside transformer station.
In the present invention, T5 takes 200ms.
The technical scheme taken further by the present invention is as follows:When substation exit breaker experiences short circuit current, become The intelligent apparatus of power station outlet breaker enter defence program immediately, if the intelligent apparatus of substation exit breaker are in T1 In receive the block signal that any panel switches intelligent apparatus are sent in addition to adjacent panel switches intelligent apparatus, then protection journey Sequence is returned immediately;Otherwise substation exit breaker intelligent apparatus start substation exit breaker with intrinsic actuation time T4 and jump Lock, T1 are panel switches intelligent apparatus intrinsic actuation time, 40ms<T4<50ms.
Further, when intelligent apparatus judge that fault occurs on the distribution line between panel switches, then in fault The intelligent apparatus of the neighbouring panel switches of trip send block signal in the T1 moment to the intelligent apparatus of this side substation exit breaker, The T1 is panel switches intelligent apparatus intrinsic actuation time, and the intelligent apparatus of section switch send combined floodgate in the T1+T2 moment Order, T2 are executed the time that tripping operation is experienced by panel switches;Isolate and the nargin of the time that restores electricity for T5-T2-T3, T3 is Section switch intelligent apparatus send the time that trip signal to section switch completes to trip, and the time margin is disconnected for making up The actuation time of road device and panel switches is discrete.
In the inventive method, when there is short trouble, then the substation exit breaker of fault side can experience short circuit electricity Stream, then the intelligent apparatus at this immediately enter defence program, if fault occurs on the distribution line between panel switches, The intelligent apparatus of so arbitrary panel switches in fault upstream send to the substation exit breaker intelligent apparatus in the T1 time and close Lock signal, to prevent substation exit circuit breaker trip, and is provided with the time delay of 200ms, in the time delay of this 200ms, foot With isolated fault, and realize reconstruct(The distribution line of section switch upstream is powered by offside transformer station);If it is determined that short Road fault occurs in substation exit proximity to circuit breakers, then this fault is to need the substation exit breaker of tripping immediately , without time delay is arranged, the electrical equipments such as substation transformer are farthest protected, which is reduced due to transformer station The possibility that outlet is closely short-circuit and damages.
The present invention is operated to substation exit breaker using unfixed delay pattern, is occurred by failure judgement The appropriate solution of ground point selection so that protection act is more precisely reliable, especially when fault occur disconnected in substation exit When near the device of road, can tripping substation exit breaker immediately, improve the rapidity of substation exit fault, effective protection electricity Power equipment, improves the security of power system.And the invention provides the corresponding time sequential routine, it is ensured that the inventive method Effectively reliable enforcement.Present inventive concept is ingenious, and using effect is good, it is contemplated that will will find broad application in relay protection field.
Description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the composition schematic diagram of network protective relaying device.
Fig. 2 is the operation sequential chart of the inventive method.
Specific embodiment
The present invention is described in detail below according to accompanying drawing, the purpose of the present invention and effect will be apparent from.
The embodiment of the present invention is based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in, its hardware Composition includes as shown in Figure 1 for part:Substation exit breaker DLA, DLB, panel switches DL1, DL2, DL3, DL4, transformer station Intelligent apparatus A, B of outlet breaker, intelligent apparatus D1, D2, D3, D4 of panel switches, all intelligent apparatus A, B, D1, D2, D3, D4 pass through network communication, the method have the characteristics that:
When intelligent apparatus judge that fault occurs on the distribution line between panel switches, such as fault occurs at K1, Then fault upstream sends to the intelligent apparatus A of this side substation exit breaker DLA adjacent to the intelligent apparatus D1 of panel switches and closes Lock signal, intelligent apparatus D1, D2 of simultaneous faults both sides panel switches DL1, DL2 send trip signal, realize Fault Isolation;This After the intelligent apparatus of side substation exit breaker DLA receive the block signal, protection is returned immediately, and arranges automatically T5= The time delay of 200ms, during the time delay, interior substation exit breaker intelligent apparatus A does not send out tripping operation to substation exit breaker Order(Substation exit breaker is failure to actuate);When panel switches tripping operation in fault both sides is finished, the intelligent apparatus of section switch Send combined floodgate order(Assume in this example that panel switches DL3 is section switch), after section switch closes a floodgate, on section switch The distribution line of trip is powered by offside transformer station, that is to say, that after panel switches DL3 closes a floodgate, load 4 is changed to be supplied by transformer station B Electricity, so far completes reconstruct;
When intelligent apparatus judge that fault occurs between panel switches DL1 and this side substation exit breaker DLA, this side The intelligent apparatus A of substation exit breaker DLA and fault down stream send tripping operation life adjacent to the intelligent apparatus of panel switches DL1 Order;Finish when this side substation exit breaker DLA and fault down stream close tripping operation adjacent to panel switches DL1, section switch Intelligent apparatus send combined floodgate order, and after section switch closes a floodgate, the distribution line of section switch upstream is supplied by offside transformer station Electricity.
During the present invention is implemented, when substation exit breaker experiences short circuit current, substation exit open circuit The intelligent apparatus of device enter defence program immediately, if the intelligent apparatus of substation exit breaker were received except phase within the T1 time The block signal that any panel switches intelligent apparatus are sent beyond adjacent panel switches intelligent apparatus, then defence program return immediately; Otherwise substation exit breaker intelligent apparatus start substation exit circuit breaker trip with intrinsic actuation time T4, and T1 is distribution Switch intelligent apparatus intrinsic actuation time, 40ms<T4<50ms.In this example, T1 takes 30ms, T4 and takes 45ms.
As shown in Fig. 2 present invention operation sequential is as follows:When intelligent apparatus judge that fault occurs joining between panel switches In electric line, then fault upstream adjacent to panel switches intelligent apparatus in intelligence from the T1 moment to this side substation exit breaker Device sends block signal, and the T1 is intelligent apparatus intrinsic actuation time, takes 30ms, the intelligence dress of section switch in this example Putting and combined floodgate order being sent with the T1+T2 moment, T2 is executed the time that tripping operation is experienced, takes 60ms in this example by panel switches;Isolation Send trip signal to section switch for T5-T2-T3, T3 for section switch intelligent apparatus with the nargin of the time of restoring electricity The time that trips is completed, in this example, takes 90ms, then the nargin of time of isolating and restore electricity is T5-T2-T3=200ms-60ms -90ms=50ms.This 50ms nargin mainly consider breaker and panel switches actuation time often slightly discrete, it is ensured that discrete Time is in the case of just, substation exit breaker is still not involved in this isolation and action.
In addition to the implementation, the present invention can also have other embodiment.All employing equivalents or equivalent transformation shape The technical scheme for becoming, all falls within the protection domain of application claims.

Claims (3)

1. a kind of based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in, distribution automation system Composition includes:Substation exit breaker, panel switches, the intelligent apparatus of substation exit breaker and panel switches Intelligent apparatus, all intelligent apparatus pass through network communication, it is characterised in that:
When intelligent apparatus judge that fault occurs on the distribution line between panel switches, then fault upstream is adjacent to panel switches Intelligent apparatus send block signal to the intelligent apparatus of this side substation exit breaker, while fault both sides panel switches Intelligent apparatus send trip signal to panel switches;The intelligent apparatus of this side substation exit breaker receive the locking After signal, protection is returned immediately, and arranges the time delay of T5 automatically, interior substation exit breaker intelligent apparatus during the time delay Trip signal is not sent out to substation exit breaker;When panel switches tripping operation in fault both sides is finished, the intelligence dress of section switch Put and combined floodgate order is sent, after section switch closes a floodgate, the distribution line of section switch upstream is powered by offside transformer station;
When intelligent apparatus judge that fault occurs between panel switches and this side substation exit breaker, this side substation exit The intelligent apparatus of breaker and fault down stream send trip signal adjacent to the intelligent apparatus of panel switches;When this side substation exit Breaker and fault down stream are finished adjacent to panel switches tripping operation, and the intelligent apparatus of section switch send combined floodgate order, and segmentation is broken After road device closes a floodgate, the distribution line of section switch upstream is powered by offside transformer station;
When intelligent apparatus judge that fault occurs on distribution line between panel switches, then arbitrary panel switches in fault upstream Intelligent apparatus send block signal in the T1 moment to the intelligent apparatus of this side substation exit breaker, and the T1 is panel switches Intelligent apparatus intrinsic actuation time, the intelligent apparatus of section switch send combined floodgate order in the T1+T2 moment, and T2 is panel switches Execute tripping operation the experienced time;It is that section switch is intelligently filled that the nargin of isolation and the time that restores electricity is T5-T2-T3, T3 The time for sending that trip signal to section switch completes to trip is put, this time nargin is used for making up breaker and panel switches Actuation time is discrete.
2. according to claim 1 based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in, It is characterized in that:When substation exit breaker experiences short circuit current, the intelligent apparatus of substation exit breaker enter immediately Enter defence program, if the intelligent apparatus of substation exit breaker were received except adjacent panel switches intelligent apparatus within the T1 time The block signal that arbitrarily panel switches intelligent apparatus are sent in addition, then defence program return immediately;Otherwise substation exit open circuit Device intelligent apparatus start substation exit circuit breaker trip with intrinsic actuation time T4, and T1 is inherently moved for panel switches intelligent apparatus Make time, 40ms<T4<50ms.
3. according to claim 1 based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in, It is characterized in that:T5=200ms.
CN201410007727.2A 2012-05-25 2012-05-25 One kind is based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in Expired - Fee Related CN103746354B (en)

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CN201210168513.4A CN102709885B (en) 2012-05-25 2012-05-25 Method for isolating power distribution network fault without constant time lag in over-current protection of transformer substation
CN201410007727.2A CN103746354B (en) 2012-05-25 2012-05-25 One kind is based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in

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CN106451383B (en) * 2016-10-24 2018-07-31 中国石油大学(华东) A kind of blocking mode pilot protection method suitable for operation with closed ring cable distribution looped network
CN110233478B (en) * 2019-06-06 2020-12-22 北京四方继保自动化股份有限公司 Method and system for quickly reconstructing millisecond-level power supply network after power grid fault
CN111190358B (en) * 2020-02-26 2023-03-14 国网河南省电力公司电力科学研究院 10kV closing angle control system and accurate control method

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CN201893540U (en) * 2010-11-26 2011-07-06 南宁华供电力科技有限公司 Intelligent radio network dispatching digital-type boundary controller complete equipment
CN102299563A (en) * 2011-08-26 2011-12-28 任建福 Digital-analog (DA) protection method for intelligent distribution network

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JP2920072B2 (en) * 1994-06-28 1999-07-19 株式会社中島電機製作所 Automatic section switch

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201893540U (en) * 2010-11-26 2011-07-06 南宁华供电力科技有限公司 Intelligent radio network dispatching digital-type boundary controller complete equipment
CN102299563A (en) * 2011-08-26 2011-12-28 任建福 Digital-analog (DA) protection method for intelligent distribution network

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