CN107666142A - 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

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Publication number
CN107666142A
CN107666142A CN201710956025.2A CN201710956025A CN107666142A CN 107666142 A CN107666142 A CN 107666142A CN 201710956025 A CN201710956025 A CN 201710956025A CN 107666142 A CN107666142 A CN 107666142A
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CN
China
Prior art keywords
power supply
equipment
time
automatic throw
emergency power
Prior art date
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Granted
Application number
CN201710956025.2A
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Chinese (zh)
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CN107666142B (en
Inventor
华亮亮
张军
金恩淑
张恺
韩慧
宣晓辰
于泽龙
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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
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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
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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

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

Abstract

The present invention relates to technical field of relay protection, is a kind of input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank, is characterized in, comprises the step of：The cooperation of setting time is acted by distribution line unconditional crank setting time and prepared auto restart, is connected in interconnection loop networks switch on the premise of bus do not have failure, any single-phase voltage is in most long fault clearing time tsetOutside be still below setting valve, automatic throw-in equipment of emergency power supply is quickly put into.With scientific and reasonable, it is accurate to differentiate, self-healing property is strong, high sensitivity, the advantages that can shortening the power off time of user.Power distribution network especially suitable for 20kV " petal " shape is without passage overcurrent protection.

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, is that a kind of alternate power autocast of power distribution network unconditional crank fills The input strategy put, the power distribution network especially suitable for 20kV " petal " shape is without passage overcurrent protection.
Technical background
Due to the factor of engineering technology, investment etc., so in China's 20kV distribution systems, typically using traditional three Segmentation overcurrent protection.So, it is only capable of quickly cutting off the failure of partial sector in every circuit, the failure of All other routes section is then It could be cut off through prolonged delay.With the fast development of China's economy, the property of power load, the net of 20kV power distribution networks There occurs huge change, traditional three-stage overcurrent protection with requirement of the user to distribution network reliability for network composition Scope is small, poor selectivity, responsiveness are slow, can not meet the requirement of China's power distribution network relay protection, is badly in need of improving power distribution network The responsiveness of middle protection, and increase the protection domain of protection.If directly the high speed relay protective plan in power transmission network is answered Power distribution network is made, for example with carrier wave or optical fiber differential protective, then has very high requirement to communication system, builds, safeguard branch Go out high, and need configuration back-up protection in addition, therefore do not meet economic principle.This, which just needs to find, a kind of is used only single-ended electricity The successive Trip of tolerance or the protection of all fronts quick acting, the securely and reliably power supply to power distribution network are significant.
The content of the invention
The technical problems to be solved by the invention are overcome the deficiencies in the prior art, there is provided it is a kind of scientific and reasonable, differentiate accurate 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.
The technical scheme for solving the use of its technical problem is a kind of alternate power autocast of power distribution network unconditional crank The input strategy of device, it is 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 Coordinate；
A) automatic throw-in equipment of emergency power supply time setting value tsetWith the cooperation of the maximum fault clearing time of circuit
In order to ensure that automatic throw-in equipment of emergency power supply is not put on faulty line after acting, alternate power autocast Setup time setting valve tsetIt must be greater than the maximum fault clearing time of circuit；
B) interconnection automatic throw-in equipment of emergency power supply closure loop networks switch L1Afterwards, the time between power distribution network two " petal " Coordinate
If a certain transformer station 20kV bus-bar faults 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, now, two radial circuits of the transformer station Most long fault clearing time be necessarily less than the minimum fault clearing time of adjacent substations power distribution network " petal ", otherwise will cause Adjacent substations protection misoperation, expand the excision extension of failure.
(2) connect in interconnection loop networks switch on the premise of bus do not have failure, any single-phase voltage is cut in most long failure Except time tsetOutside 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：Connect bus in interconnection loop networks switch and do not have faulty premise Under, any single-phase voltage is in most long fault clearing time tsetOutside be less than setting valve, criterion is formula (1)；
ΣIpi=0＆US＜ Uset＆t ＞ tset (1)
In formula, Σ IpiIt is standby during in order to prevent contact point busbar short-circuit failure for each connecting element electric current sum of bus Power supply automatic throw-in equipment acts, it is necessary to is meeting 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 set For 30% rated voltage；T is the time；tsetIt is time setting value, is traditionally arranged to be the distribution line failure most long 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 present invention, it is particularly suitable In 20kV " petal " shape power distribution networks without passage overcurrent protection, pass through distribution line unconditional crank setting time and stand-by power supply Automatic throw-in equipment acts the cooperation of setting time, connects in interconnection loop networks switch on the premise of bus do not have failure, arbitrarily Single-phase voltage is in most long fault clearing time tsetOutside be still below setting valve, automatic throw-in equipment of emergency power supply is quickly put into.Can To significantly improve the reliability of system and self-healing property, shorten the power off time of user.With scientific and reasonable, it is accurate to differentiate, self-healing Property is strong, the advantages that high sensitivity.
Brief description of the drawings
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 faults protection R occurs for circuit BC3Booster response view；
BC phase faults protection R occurs for Fig. 6 circuits BC3Responsive state schematic diagram.
Embodiment
Technical scheme 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 cause petal open loop operation, situation about being broken down in petal.Such as Shown in Fig. 2, such as after circuit EF failures or maintenance, BC phase faults occur again for circuit AB, comprise the following steps：
S1：Setting time is acted by distribution line unconditional crank setting time and automatic throw-in equipment of emergency power supply Coordinate；
When step S1 is adjusted by distribution line unconditional crank setting time and automatic throw-in equipment of emergency power supply action 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 circuit
In order to ensure that automatic throw-in equipment of emergency power supply is not put on faulty line after acting, alternate power autocast Setup time setting valve tsetIt must be greater than the maximum fault clearing time of circuit；
S12：Interconnection automatic throw-in equipment of emergency power supply closure loop networks switch L1Afterwards, between power distribution network two " petal " when Between coordinate
If a certain transformer station 20kV bus-bar faults 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, and now, two radial circuits of the transformer station are most Long fault clearing time is necessarily less than the minimum fault clearing time of adjacent substations power distribution network " petal ", otherwise will cause adjacent Transforming plant protecting malfunctions, and expands the excision extension of failure；
S2：Connect in interconnection loop networks switch on the premise of bus do not have failure, any single-phase voltage is cut in most long failure Except time tsetOutside be still below setting valve, automatic throw-in equipment of emergency power supply is quickly put into；
Step S2 is included in interconnection loop networks switch and connected on the premise of bus do not have failure, and any single-phase voltage is most long Fault clearing time tsetOutside be still below setting valve, automatic throw-in equipment of emergency power supply is quickly put into, and is specifically included：
S21：Automatic throw-in equipment of emergency power supply operating criterion is：Interconnection loop networks switch connect bus do not have it is faulty Under the premise of, any single-phase voltage is in most long fault clearing time tsetOutside be less than setting valve.Criterion is shown in shown in formula (1).
ΣIpi=0＆US＜ Uset＆t ＞ tset (1)
In formula, Σ IpiIt is standby during in order to prevent contact point busbar short-circuit failure for each connecting element electric current sum of bus Power supply automatic throw-in equipment acts, it is necessary to is meeting 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 set For 30% rated voltage；T is the time；tsetIt is time setting value, is traditionally arranged to be the distribution line failure most long 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 circuit FE is because failure or maintenance are exited After operation, BC phase faults occur for 0s moment, circuit AB, now A transformer stations mesh portion circuit decompression.Stand-by power supply is thrown automatically Entering device detects BC phase voltages after falling with protecting R1~R2And R8~R11It is synchronous in the startup at 0s moment, due to protecting R8 0.4s is acted at first, protects R9~R11Return, protect R2Current break is detected in acceleration time 0.4~0.45s of section, 0.45s accelerated motion excision failures, automatic throw-in equipment of emergency power supply detect voltage less than setting valve and timing ever since Loop networks switch is closed a floodgate after to 0.8s, powered to the load 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 of " petal " shape power distribution network normal operation, protection act, after alternate power autocast, system switchs to temporarily Mode is run, and is comprised the following steps：
As shown in Fig. 2 after A transformer substation side 20kV bus-bar faults or maintenance, contact point closure, contact is passed through by B transformer stations Put to decompression ring network power supply.Now, A power distribution networks are changed into two radiation networks from closure looped network.If f2BC phase faults occur for place, this When decompression ring network power supply obtain failure mute time it is most long.Fig. 5 is that BC phase faults protection R occurs for circuit BC3Booster response. As shown in figure 5, the protection R close to mains side9Protect and be operating normally according to time delay over-current, actuation time 0.7s, action A phase currents decline rapidly in 0.7s~0.75s afterwards, meet accelerated motion condition.As shown in fig. 6, load side direction over current protection Protect R3Short circuit current will be can't detect, detects B buses per phase R at the 0s momentU、RIIncrease simultaneously and cross threshold value to start Protection, in 0.7s~0.75s acceleration time section, protect R3Detect that A phase currents are mutated, acceleration protection acts in 0.75s. It need to note it is to be noted that in f2After short circuit occurs for place, R in B transformer stations 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 passage The automatic throw-in equipment of emergency power supply input strategy of protection, by distribution line unconditional crank setting time and stand-by power supply from The cooperation of dynamic feeding device action setting time, connect in interconnection loop networks switch on the premise of bus do not have failure, arbitrarily singly Phase voltage is in most long fault clearing time tsetOutside 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 of system are significantly improved, shortens the power off time of user.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.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 change or Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or Among changing still in the protection domain of the invention.

Claims (1)

1. a kind of input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank, it is characterized in that, what it included Step has：
(1) matching somebody with somebody for setting time is acted by distribution line unconditional crank setting time and automatic throw-in equipment of emergency power supply Close；
A) automatic throw-in equipment of emergency power supply time setting value tsetWith the cooperation of the maximum fault clearing time of circuit
In order to ensure that automatic throw-in equipment of emergency power supply is not put on faulty line after acting, automatic throw-in equipment of emergency power supply Time setting value tsetIt must be greater than the maximum fault clearing time of circuit；
B) interconnection automatic throw-in equipment of emergency power supply closure loop networks switch L1Afterwards, the time coordination between power distribution network two " petal "
If a certain transformer station 20kV bus-bar faults or maintenance, interconnection automatic throw-in equipment of emergency power supply closure, power distribution network two " petal " load turns the adjacent ring network power supply of adjacent substations by contact point, and now, two radial circuits of the transformer station are most Long fault clearing time is necessarily less than the minimum fault clearing time of adjacent substations power distribution network " petal ", otherwise will cause adjacent Transforming plant protecting malfunctions, and expands the excision extension of failure.
(2) connect in interconnection loop networks switch on the premise of bus do not have failure, any single-phase voltage is in most long failure removal Between tsetOutside 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：Connect in interconnection loop networks switch on the premise of bus do not have failure, Any single-phase voltage is in most long fault clearing time tsetOutside be less than setting valve, criterion is formula (1)；
ΣIpi=0＆US＜ Uset＆t ＞ tset (1)
In formula, Σ IpiFor each connecting element electric current sum of bus, stand-by power supply during in order to prevent contact point busbar short-circuit failure Automatic throw-in equipment acts, it is necessary to is meeting Σ IpiInterconnection automatic throw-in equipment of emergency power supply R when=01It could start, due to Protect R1、R2、R3In a switchyard, information sharing between three protections can be formed a small locality protection；Us For current voltage effective value；A certain phase in subscript behalf a, b, c three-phase；UsetFailure adjusts voltage, is traditionally arranged to be 30% rated voltage；T is the time；tsetIt is time setting value, is traditionally arranged to be the distribution line failure most long mute time.
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)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108711852A (en) * 2018-06-22 2018-10-26 天津大学 A kind of distribution network failure parametric sensitivity computational methods based on fault estimator
CN112701778A (en) * 2020-12-22 2021-04-23 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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108711852A (en) * 2018-06-22 2018-10-26 天津大学 A kind of distribution network failure parametric sensitivity computational methods based on fault estimator
CN112701778A (en) * 2020-12-22 2021-04-23 雅砻江流域水电开发有限公司 Three-section type auxiliary power automatic switching method with contact bus
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

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