CN107666142B - The input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank - Google Patents

The input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank Download PDF

Info

Publication number
CN107666142B
CN107666142B CN201710956025.2A CN201710956025A CN107666142B CN 107666142 B CN107666142 B CN 107666142B CN 201710956025 A CN201710956025 A CN 201710956025A CN 107666142 B CN107666142 B CN 107666142B
Authority
CN
China
Prior art keywords
power supply
time
distribution network
line
input device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201710956025.2A
Other languages
Chinese (zh)
Other versions
CN107666142A (en
Inventor
华亮亮
张军
金恩淑
张恺
韩慧
宣晓辰
于泽龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tongliao Electric Co Of State Grid Eastern Inner Mongolia Electric Power Co Ltd
State Grid Corp of China SGCC
Northeast Electric Power University
Original Assignee
Tongliao Electric Co Of State Grid Eastern Inner Mongolia Electric Power Co Ltd
State Grid Corp of China SGCC
Northeast Dianli University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tongliao Electric Co Of State Grid Eastern Inner Mongolia Electric Power Co Ltd, State Grid Corp of China SGCC, Northeast Dianli University filed Critical Tongliao Electric Co Of State Grid Eastern Inner Mongolia Electric Power Co Ltd
Priority to CN201710956025.2A priority Critical patent/CN107666142B/en
Publication of CN107666142A publication Critical patent/CN107666142A/en
Application granted granted Critical
Publication of CN107666142B publication Critical patent/CN107666142B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency 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
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency 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
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/266—Sectionalised 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 switching on a spare supply
    • 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

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

本发明涉及继电保护技术领域，是一种配电网无通道保护的备用电源自动投入装置的投入策略，其特点是，包括的步骤有：通过配电线路无通道保护整定时间与备自投动作整定时间的配合，在联络线环网开关所连母线没有故障的前提下，任意单相电压在最长故障切除时间tset之外仍低于整定值，备用电源自动投入装置快速投入。具有科学合理，判别准确，自愈性强，灵敏度高，能够缩短用户的停电时间等优点。特别适用于20kV“花瓣”状的配电网无通道过电流保护。

The invention relates to the technical field of relay protection, and is an input strategy of a backup power supply automatic switching device without channel protection in a distribution network. With the coordination of the action setting time, on the premise that the busbar connected to the tie line ring network switch is not faulty, any single-phase voltage is still lower than the setting value outside the longest fault clearing time tset , and the backup power automatic input device is quickly turned on. It has the advantages of scientific and reasonable, accurate judgment, strong self-healing, high sensitivity, and can shorten the power outage time of users. It is especially suitable for channel-free overcurrent protection of 20kV "petal"-shaped distribution network.

Description

The input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank
Technical field
The present invention relates to technical field of relay protection, are a kind of alternate power autocast dresses of power distribution network unconditional crank The input strategy set, the power distribution network especially suitable for 20kV " petal " shape is without channel overcurrent protection.
Technical background
Due to the factor of engineering technology, investment etc., so generally using traditional three in China's 20kV distribution system Segmentation overcurrent protection.In this way, being only capable of quickly cutting off the failure of partial sector in every route, the failure of All other routes section is then Wanting the delay of through a long time could cut off.With the rapid development of our country's economy, the property of power load, 20kV power distribution network net Network is constituted and huge variation, traditional three-stage overcurrent protection has occurred in requirement of the user to distribution network reliability Range is small, poor selectivity, movement speed are slow, has been unable to meet the requirement of China's power distribution network relay protection, is badly in need of improving power distribution network The movement speed of middle protection, and increase the protection scope of protection.If directly the high speed relay protective plan in power transmission network is answered Power distribution network is made, for example, by using carrier wave or optical fiber differential protective, then has very high requirement, construction, maintenance branch to communication system It is high out, and in addition configuration back-up protection is needed, therefore do not meet economic principle.This just needs to find a kind of using only single-ended electricity The successive Trip of tolerance or the protection of all fronts quick acting are significant to the securely and reliably power supply of power distribution network.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of scientific and reasonable, differentiation standard Really, self-healing property is strong, the input strategy of the automatic throw-in equipment of emergency power supply of the power distribution network unconditional crank of high sensitivity.
Solve its technical problem the technical solution adopted is that, a kind of alternate power autocast of power distribution network unconditional crank The input strategy of device, characterized in that it is comprised the step of:
(1) setting time is acted by distribution line unconditional crank setting time and automatic throw-in equipment of emergency power supply Cooperation；
A) automatic throw-in equipment of emergency power supply time setting value tsetWith the cooperation of the maximum fault clearing time of route
In order to guarantee not put on faulty line after automatic throw-in equipment of emergency power supply acts, alternate power autocast Setup time setting valve tsetIt must be greater than the maximum fault clearing time of route；
B) interconnection automatic throw-in equipment of emergency power supply is closed loop networks switch L1Afterwards, the time between power distribution network two " petal " Cooperation
If a certain substation 20kV bus-bar fault or maintenance, interconnection automatic throw-in equipment of emergency power supply closure, power distribution network Two " petal " loads turn the adjacent ring network power supply of adjacent substations by contact point, at this point, two radial routes of the substation Longest fault clearing time be necessarily less than the minimum fault clearing time of adjacent substations power distribution network " petal ", otherwise will lead to Adjacent substations protection misoperation expands the excision extension of failure.
(2) under the premise of the connected bus of interconnection loop networks switch does not have failure, any single-phase voltage is cut in longest failure Except time tsetExcept be still below setting valve, automatic throw-in equipment of emergency power supply is quickly put into；
Automatic throw-in equipment of emergency power supply operating criterion is: not having faulty premise in the connected bus of interconnection loop networks switch Under, any single-phase voltage is in longest fault clearing time tsetExcept be lower than setting valve, criterion be formula (1)；
ΣIpi=0&US< Uset&t > tset (1)
In formula, Σ IpiIt is spare when contact point busbar short-circuit failure in order to prevent for the sum of each connecting element electric current of bus Power supply automatic throw-in equipment movement, it is necessary to meet Σ IpiInterconnection automatic throw-in equipment of emergency power supply R when=01It could start, Due to protecting R1、R2、R3In a switchyard, information sharing between three protections can be formed a small region and be protected Shield；UsFor current voltage effective value；A certain phase in subscript behalf a, b, c three-phase；UsetFailure adjusts voltage, general to be arranged For 30% voltage rating；T is the time；tsetIt is time setting value, is traditionally arranged to be the distribution line failure longest mute time.
A kind of input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank of the invention, it is particularly suitable In 20kV " petal " shape power distribution network without channel overcurrent protection, pass through distribution line unconditional crank setting time and backup power source Automatic throw-in equipment acts the cooperation of setting time, under the premise of the connected bus of interconnection loop networks switch does not have failure, arbitrarily Single-phase voltage is in longest fault clearing time tsetExcept be still below setting valve, automatic throw-in equipment of emergency power supply is quickly put into.It can To significantly improve the reliability and self-healing property of system, shorten the power off time of user.With scientific and reasonable, it is accurate to differentiate, self-healing The advantages that property is strong, high sensitivity.
Detailed description of the invention
Fig. 1 is a kind of input strategy flow chart of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank；
Fig. 2 is 20kV " petal " shape simplified model of distribution networks schematic diagram；
Fig. 3 is contact point automatic throw-in equipment of emergency power supply action flow chart；
Fig. 4 is the responsive state schematic diagram of automatic throw-in equipment of emergency power supply；
Fig. 5 is that BC phase fault protection R occurs for route BC3Booster response status diagram；
Fig. 6 route BC occurs BC phase fault and protects R3Responsive state schematic diagram.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with drawings and examples.
Embodiment 1:
Embodiment 1 provides a kind of automatic throw-in equipment of emergency power supply input strategy of power distribution network unconditional crank, works as 20kV When the loop grid failure of " petal " shape power distribution network or maintenance lead to petal open loop operation, the case where breaking down in petal.Such as Shown in Fig. 2, such as after route EF failure or maintenance, BC phase fault occurs again for route AB, includes the following steps:
S1: setting time is acted by distribution line unconditional crank setting time and automatic throw-in equipment of emergency power supply Cooperation；
When step S1 is adjusted by distribution line unconditional crank setting time and automatic throw-in equipment of emergency power supply movement Between cooperation, specifically include:
S11: automatic throw-in equipment of emergency power supply time setting value tsetWith the cooperation of the maximum fault clearing time of route
In order to guarantee not put on faulty line after automatic throw-in equipment of emergency power supply acts, alternate power autocast Setup time setting valve tsetIt must be greater than the maximum fault clearing time of route；
S12: interconnection automatic throw-in equipment of emergency power supply is closed loop networks switch L1Afterwards, between power distribution network two " petal " when Between cooperate
If a certain substation 20kV bus-bar fault or maintenance, interconnection automatic throw-in equipment of emergency power supply closure, power distribution network " petal " load turns the adjacent ring network power supply of adjacent substations by contact point, at this point, two radial routes of the substation are most Long fault clearing time is necessarily less than the minimum fault clearing time of adjacent substations power distribution network " petal ", otherwise will lead to adjacent Transforming plant protecting malfunction, expands the excision extension of failure；
S2: under the premise of the connected bus of interconnection loop networks switch does not have failure, any single-phase voltage is cut in longest failure Except time tsetExcept be still below setting valve, automatic throw-in equipment of emergency power supply is quickly put into；
Step S2 is included under the premise of the connected bus of interconnection loop networks switch do not have failure, and any single-phase voltage is in longest Fault clearing time tsetExcept be still below setting valve, automatic throw-in equipment of emergency power supply is quickly put into, specifically include:
S21: automatic throw-in equipment of emergency power supply operating criterion is: not having in the connected bus of interconnection loop networks switch faulty Under the premise of, any single-phase voltage is in longest fault clearing time tsetExcept be lower than setting valve.Criterion is shown in shown in formula (1).
ΣIpi=0&US< Uset&t > tset (1)
In formula, Σ IpiIt is spare when contact point busbar short-circuit failure in order to prevent for the sum of each connecting element electric current of bus Power supply automatic throw-in equipment movement, it is necessary to meet Σ IpiInterconnection automatic throw-in equipment of emergency power supply R when=01It could start. Due to protecting R1、R2、R3In a switchyard, information sharing between three protections can be formed a small region and be protected Shield；USFor current voltage effective value；A certain phase in subscript behalf a, b, c three-phase；UsetFailure adjusts voltage, general to be arranged For 30% voltage rating；T is the time；tsetIt is time setting value, is traditionally arranged to be the distribution line failure longest mute time.Fig. 3 For contact point automatic throw-in equipment of emergency power supply action flow chart.
According to above-mentioned steps, Fig. 4 is the response of automatic throw-in equipment of emergency power supply, and route FE is because failure or maintenance are exited After operation, BC phase fault occurs for 0s moment, route AB, at this time A substation mesh portion route decompression.Backup power source is thrown automatically Enter device and detects that BC phase voltage falls rear and protection R1~R2And R8~R11It is synchronous in the starting at 0s moment, due to protecting R8? 0.4s is acted at first, protects R9~R11It returns, protects R2Current break is detected in acceleration time 0.4~0.45s of section, 0.45s accelerated motion excision failure, automatic throw-in equipment of emergency power supply detect voltage lower than setting valve and timing ever since Loop networks switch is set to close a floodgate after to 0.8s, the load power supply on bus C, D, E.
Embodiment 2:
Embodiment 2 provides a kind of automatic throw-in equipment of emergency power supply input strategy of power distribution network unconditional crank, works as 20kV The system jam that " petal " shape power distribution network operates normally, protection act, after alternate power autocast, system switchs to temporarily Mode is run, and is included the following steps:
As shown in Fig. 2, after A transformer substation side 20kV bus-bar fault or maintenance, contact point closure passes through contact by B substation It puts to decompression ring network power supply.At this point, A power distribution network becomes two radiation networks from closure looped network.If f2BC phase fault occurs for place, this When decompression ring network power supply obtain the mute time longest of failure.Fig. 5 is that BC phase fault protection R occurs for route BC3Booster response. As shown in figure 5, close to the protection R of source side9It protects and is operating normally according to time delay over-current, actuation time 0.7s, movement A phase current declines rapidly in 0.7s~0.75s afterwards, meets accelerated motion condition.As shown in fig. 6, load side direction over current protection Protect R3It will test less than short circuit current, detect the every phase R of B bus at the 0s momentU、RIIncrease simultaneously and cross threshold value to start Protection protects R in the acceleration time section of 0.7s~0.75s3Detect that A phase current is mutated, acceleration protection is acted in 0.75s. It need to infuse it is to be noted that in f2After short circuit occurs for place, R in B substation looped network13、R14、R15、R22、R23、R24Also will start, but due to Their operation time limit needs 1.0s at the soonest, so will not malfunction.Embodiment 2 provides a kind of power distribution network without channel The automatic throw-in equipment of emergency power supply input strategy of protection, by distribution line unconditional crank setting time and backup power source from The cooperation of dynamic investment device action setting time, it is any single under the premise of the connected bus of interconnection loop networks switch does not have failure Phase voltage is in longest fault clearing time tsetExcept be still below setting valve, automatic throw-in equipment of emergency power supply is quickly put into, can be with The reliability and self-healing property for significantly improving system, shorten the power off time of user.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or It changes still within the protection scope of the invention.

Claims (1)

1.一种配电网无通道保护的备用电源自动投入装置的投入策略，其特征是，它包括的步骤有：1. the input strategy of the standby power supply automatic input device of a distribution network without channel protection, it is characterized in that, the step that it comprises has: (1)通过配电线路无通道保护整定时间与备用电源自动投入装置动作整定时间的配合；(1) Through the coordination between the setting time of the no-channel protection of the distribution line and the setting time of the automatic input device of the backup power supply; a)备用电源自动投入装置时间整定值tset与线路的最大故障切除时间的配合a) The coordination of the time setting value t set of the automatic input device of the standby power supply and the maximum fault clearing time of the line 为了保证备用电源自动投入装置动作后不投入到故障线路上，备用电源自动投入装置时间整定值tset必须要大于线路的最大故障切除时间；In order to ensure that the automatic switching-in device of the standby power supply is not switched on to the faulty line after the operation, the time setting value tset of the automatic switching-in device of the standby power supply must be greater than the maximum fault clearing time of the line; b)联络线备用电源自动投入装置闭合环网开关L1后，配电网两个“花瓣”间的时间配合b) After the automatic input device of the backup power supply of the tie line closes the ring network switch L1, the time coordination between the two "petals" of the distribution network 若某一变电站20kV母线故障或检修，联络线备用电源自动投入装置闭合，配电网两个“花瓣”负荷通过联络点转相邻变电站相邻环网供电，此时，该变电站两条辐射状线路的最长故障切除时间必须小于相邻变电站配电网“花瓣”的最小故障切除时间，否则将导致相邻变电站保护误动作，扩大故障的切除范围；If the 20kV bus of a substation fails or is repaired, the automatic input device of the tie line backup power supply is closed, and the two "petal" loads of the distribution network are transferred to the adjacent ring network of the adjacent substation through the tie point to supply power. The longest fault clearing time of the line must be less than the minimum fault clearing time of the “petal” of the adjacent substation distribution network, otherwise it will cause the adjacent substation protection to malfunction and expand the fault clearing range; (2)在联络线环网开关所连母线没有故障的前提下，任意单相电压在最长故障切除时间tset之外仍低于整定值，备用电源自动投入装置快速投入；(2) Under the premise that the busbar connected to the tie-line ring network switch is not faulty, if any single-phase voltage is still lower than the set value outside the longest fault clearing time tset, the automatic power-on device of the backup power supply is put on quickly; 备用电源自动投入装置动作判据是：在联络线环网开关所连母线没有故障的前提下，任意单相电压在最长故障切除时间tset之外低于整定值，判据为式(1)；The action criterion of the standby power supply automatic input device is: on the premise that the busbar connected to the tie line ring network switch is not faulty, any single-phase voltage is lower than the set value outside the longest fault clearing time tset, and the criterion is formula (1 ); ΣIpi＝0&US＜Uset&t＞tset (1)ΣI pi =0&U S <U set &t> t set (1) 式中，ΣIpi为母线各个连接元件电流之和，为了防止联络点母线短路故障时备用电源自动投入装置动作，必须在满足ΣIpi＝0时联络线备用电源自动投入装置R1才能启动，由于保护R1、R2、R3在一个开关站内，将三个保护之间信息共享，形成一个小的区域保护；Us为当前的电压有效值；下标s代表a、b、c三相中的某一相；Uset故障整定电压，设置为30％额定电压；t是时间；tset是时间整定值，设置为配电线路故障最长切除时间。In the formula, ΣI pi is the sum of the currents of the various connecting elements of the bus. In order to prevent the automatic input device of the backup power supply from operating when the busbar of the contact point is short-circuited, the automatic input device R 1 of the backup power supply of the tie line must be activated when ΣI pi = 0 is satisfied. The protections R 1 , R 2 , and R 3 are in a switch station, and the information between the three protections is shared to form a small area protection; U s is the current voltage RMS; the subscript s represents a, b, c three-phase U set fault setting voltage, set to 30% of the rated voltage; t is time; t set is the time setting value, set to the longest disconnection time for distribution line faults.
CN201710956025.2A 2017-10-15 2017-10-15 The input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank Expired - Fee Related CN107666142B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710956025.2A CN107666142B (en) 2017-10-15 2017-10-15 The input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710956025.2A CN107666142B (en) 2017-10-15 2017-10-15 The input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank

Publications (2)

Publication Number Publication Date
CN107666142A CN107666142A (en) 2018-02-06
CN107666142B true CN107666142B (en) 2019-03-29

Family

ID=61098297

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710956025.2A Expired - Fee Related CN107666142B (en) 2017-10-15 2017-10-15 The input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank

Country Status (1)

Country Link
CN (1) CN107666142B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108711852B (en) * 2018-06-22 2021-02-26 天津大学 Power distribution network fault parameter sensitivity calculation method based on fault incidence matrix
CN112701778B (en) * 2020-12-22 2023-02-07 雅砻江流域水电开发有限公司 Three-section type auxiliary power automatic switching method with contact bus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103887879A (en) * 2014-03-25 2014-06-25 广州供电局有限公司 Petal type power distribution network protection control system
CN106058831A (en) * 2016-08-05 2016-10-26 江苏方天电力技术有限公司 Intelligent distributed rapid protection and fault isolation method of self-adaptive power distribution network
CN205693346U (en) * 2016-06-15 2016-11-16 国网江苏省电力公司无锡供电公司 Petal-shaped distribution line optical fiber differential protective circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103887879A (en) * 2014-03-25 2014-06-25 广州供电局有限公司 Petal type power distribution network protection control system
CN205693346U (en) * 2016-06-15 2016-11-16 国网江苏省电力公司无锡供电公司 Petal-shaped distribution line optical fiber differential protective circuit
CN106058831A (en) * 2016-08-05 2016-10-26 江苏方天电力技术有限公司 Intelligent distributed rapid protection and fault isolation method of self-adaptive power distribution network

Also Published As

Publication number Publication date
CN107666142A (en) 2018-02-06

Similar Documents

Publication Publication Date Title
CN108376974B (en) A distribution network relay protection system based on current-limiting step-difference coordination
CN104539043B (en) A kind of automatic switching device of standby power supply system haul oneself willingly into method
CN111756022B (en) Fusion type in-situ feeder automatic design method
CN104362599A (en) Protection method of low-voltage busbar in intelligent substation
CN205753377U (en) Ring network closure system based on distribution automation terminal
CN103904626A (en) Method for automatically judging and controlling power distribution network failure in ring main unit power supply
CN110635460B (en) On-site feeder automation device, section switch and interconnection switch
CN106787141A (en) A kind of extension spare power automatic switching method of 10kV switchyards interconnection
CN106786418A (en) A kind of relay protection scheme system for being used to get in touch between 10 kilovolts of switchyard stations
CN116111587A (en) Method for quickly self-healing line faults of secondary trunk distribution network
CN109412124B (en) Distribution line interphase short circuit protection configuration and setting method
CN103986128A (en) An accelerated trip protection technology based on low-voltage side of intelligent substation
CN111525525A (en) A method and device for restoring power supply to a non-faulty section downstream of a ground fault
CN103280780B (en) A kind of system with non effectively earth ed neutral fault self-recovery method
CN107666142B (en) The input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank
CN204271745U (en) Backup power self-injection device system
CN111856213A (en) Fault positioning method for looped network operation
CN111711176A (en) A station domain protection method adapting to the scenario of short-circuit current exceeding the standard
CN116404618A (en) Voltage-current feeder automation fault processing method based on circuit breaker
CN105024360A (en) Distribution network switching station relay protection operation optimization method
CN102646966A (en) A method for handling three-phase faults of distribution lines
CN114256818B (en) Multistage current limiting protection method and configuration system for power distribution network main line
CN103532111A (en) Incoming line and outgoing line protector of switching station
CN103915826A (en) Automatic power distribution network fault judging and control method of full-breaker ring main unit power supply
CN104734117B (en) A kind of breaker fail protection method of substation

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20190329

Termination date: 20201015

CF01 Termination of patent right due to non-payment of annual fee