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 PDFInfo
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- 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
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- power supply
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- automatic throw
- emergency power
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- 230000004224 protection Effects 0.000 claims abstract description 28
- 230000033001 locomotion Effects 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 8
- 230000007257 malfunction Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000001131 transforming effect Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000006837 decompression Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
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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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- Supply And Distribution Of Alternating Current (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The present invention relates to technical field of relay protection; it is a kind of input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank; its main feature is that; it comprises the step of: acting the cooperation of setting time by distribution line unconditional crank setting time and prepared auto restart; under the premise of the connected bus of interconnection loop networks switch does not have failure, 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.The advantages that with scientific and reasonable, it is accurate to differentiate, self-healing property is strong, high sensitivity, can shorten the power off time of user.Power distribution network especially suitable for 20kV " petal " shape is without channel overcurrent protection.
Description
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. a kind of input strategy of the automatic throw-in equipment of emergency power supply of power distribution network unconditional crank, characterized in that it included
Step has:
(1) matching for setting time is acted by distribution line unconditional crank setting time and automatic throw-in equipment of emergency power supply
It closes；
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, automatic throw-in equipment of emergency power supply
Time setting value 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 coordination between power distribution network two " petal "
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 " 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；
(2) under the premise of the connected bus of interconnection loop networks switch does not have failure, any single-phase voltage is in longest failure removal
Between 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: under the premise of the connected bus of interconnection loop networks switch does not have failure,
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 IpiFor the sum of each connecting element electric current of bus, backup power source when contact point busbar short-circuit failure in order to prevent
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
Protect R1、R2、R3In a switchyard, by information sharing between three protections, a small locality protection is formed；UsTo work as
Preceding voltage effective value；A certain phase in subscript behalf a, b, c three-phase；UsetFailure adjusts voltage, is set as 30% specified electricity
Pressure；T is the time；tsetIt is time setting value, is set as the distribution line failure longest mute time.
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| 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| CN107666142A CN107666142A (en) | 2018-02-06 |
| CN107666142B true CN107666142B (en) | 2019-03-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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)
| 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 |
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2017
- 2017-10-15 CN CN201710956025.2A patent/CN107666142B/en not_active Expired - Fee Related
Patent Citations (3)
| 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 |
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