CN106300302A - A kind of distribution protection method - Google Patents
A kind of distribution protection method Download PDFInfo
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- CN106300302A CN106300302A CN201510296725.4A CN201510296725A CN106300302A CN 106300302 A CN106300302 A CN 106300302A CN 201510296725 A CN201510296725 A CN 201510296725A CN 106300302 A CN106300302 A CN 106300302A
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Abstract
The invention discloses a kind of distribution protection method, it is characterised in that comprise the steps: when current protection circuit breaks down, calculate the initial setting current value at current protection circuit head end；Calculate the maximum rear end motor feedback currents value at current protection circuit head end；Calculate the fault curre under the minimum operational mode at current protection circuit head end；Take in the fault curre under initial setting current value described at current protection circuit head end, maximum rear end motor feedback currents value, minimum operational mode maximum as the setting current setting value of current protection circuit.The present invention reduces the motor feedback currents impact on non-fault line protection device; can also be identical value by the protection seting of block switch same under different running method; the setting method that not only simplify protection also substantially increases reliability and the selectivity of protection, and the method is applicable to have automation function, the power distribution network of many block switches.
Description
Technical field
The present invention relates to a kind of distribution protection method, belong to technical field of electric power system control.
Background technology
Distribution network automated main purpose is to realize the state inspection under electrical network normal operation
Fault diagnosis under survey, DATA REASONING and running optimizatin, failure condition, Fault Isolation, power supply
The functions such as recovery, major control is to liking medium voltage distribution network.Through years development, China's distribution
Automation level has had and has improved largely, by automatization's distribution terminal (FTU) and
Modern communication technology, achieves the segmentation of necessity, communication automation system at important distribution line
And ring network power supply.
When electrical network or electrical equipment break down, or when the abnormal conditions affecting safe operation occur,
Automatization's power distribution network can automatically excise faulty equipment and eliminate abnormal conditions, needs block switch
Protection meets the requirement of reliability, selectivity, quick-action and susceptiveness.The segmentation of faulty section is opened
Closing protection act will quick and precisely and not malfunction.
The generally motor load in circuit is simply equivalent to inductive impedance often in calculating, and
And not considering the impact on protection of its feedback current, these are many, short for circuit upper motor load
During road, the protection of the distribution line that feedback current is big is the most unfavorable, it is difficult to ensure the selectivity of protection,
It is likely to result in false protection, expansion accident scope.
Being the power distribution network with automation function as shown in Figure 1, block switch A～H all installed
Stream protection, H is normally opened interconnection switch, under normal circumstances when being short-circuited at K1 on L1 section circuit
During fault, due to protection definite value and the setting of operation time limit so that switch B tripping operation, H closes,
Other switches are all failure to actuate, it is ensured that L2, L3 section circuit can by other power supply or line powering,
Reduce fault coverage, it is ensured that the selectivity of protection device as far as possible；Same as L4 section circuit K2
During the fault that is short-circuited, should be excised fault by E protection act, H closes, and other switches are motionless
Making, L5, L6 section circuit is by other power supplys or line powering.
But when circuit exists a large amount of motor load, due to motor feedback electricity during fault
The impact of stream so that the cooperation of each protection is sufficiently complex, especially for tool as shown in Figure 1
Having the distribution line of loop-net operation mode, after the excision of certain line fault, protection may be in not
Under the same method of operation, causing trouble electric current and motor feedback currents are entirely different, protection
Arrange extremely difficult with cooperation each other.
As a example by Fig. 1, when K1 is short-circuited fault, due to the most electronic on circuit L2, L3
The existence of machine load so that a large amount of feedback currents flow to short dot, this circuit adjacent lines simultaneously
On also can be by Effect of Short Circuit, substantial amounts of motor feedback currents also can flow to short dot so that
Switch C, D, E, F, G even bus-tie circuit breaker A is likely to by motor feedback currents
There is malfunction, expansion accident scope in impact, cannot realize the selectivity requirement of protection at all, join
Grid automation function is also difficult to.
Summary of the invention
The technical problem to be solved in the present invention is: solve in power distribution network due to motor feedback currents
Cause non-faulting section switching surge switching malfunction, improve reliability and the selectivity of protection.
For realizing above-mentioned goal of the invention, the invention provides a kind of distribution protection method, bag
Include following steps:
When current protection circuit breaks down,
Calculate the initial setting current value at current protection circuit head end；
Calculate the maximum rear end motor feedback currents value at current protection circuit head end；
Calculate the fault curre under the minimum operational mode at current protection circuit head end；
Take initial setting current value described at current protection circuit head end, maximum rear end motor anti-
In fault curre under feed flow valuve, minimum operational mode, maximum is as current protection circuit
Setting current setting value.
The most more preferably, the initial setting current value at described current protection circuit head end is to pass through
In the following manner calculates:
When current protection circuit breaks down the fault curre of current protection circuit head end with can
Take what business obtained by coefficient.
The most more preferably, the fault curre of described current protection circuit head end is by with lower section
Formula calculates:
Wherein, Ip (2)For the fault curre of current protection circuit head end, ishRush for three-phase fault
Hit current peak.
The most more preferably, described motor feedback currents is to be determined by motor factory-said value or logical
Cross and motor modeling and simulating obtained.
The most more preferably, under described minimum operational mode, fault curre at current protection is logical
Cross what in the following manner calculated:
Wherein, IkFor the fault curre at protection current under minimum operational mode,For system
The phase electromotive force of equivalent source, ZsFor the impedance between protection installation place to system equivalent source, Zk
For the impedance between short dot to protection installation place.
The most more preferably, same protection device it is additionally included in power distribution network under different running method
The determination step of setting current setting value:
The different setting current setting values of the same protection device obtained under different running method, choosing
Select minimum as the same protection device whole current settings definite value under different running method.
A kind of distribution protection method that the present invention provides, decreases motor feedback currents to non-
The impact of faulty line protection device, can also be by same under different running method by the method
The protection seting of block switch is identical value, and the setting method that not only simplify protection carries the most significantly
The reliability of high protection and selectivity, the method is applicable to have automation function, many segmentations
The power distribution network of switch, all has power distribution network safe and reliable operation and automatization and intelligent development
Important meaning.
Accompanying drawing explanation
Fig. 1 is the distribution line figure of loop-net operation mode in prior art；
Fig. 2 is single supply radial distribution networks schematic diagram of the present invention；
Fig. 3 is that dual power supply of the present invention is handed in hand looped network power distribution network schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is made the most in detail
Describe.Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
At present, the selectivity of block switch protection is mainly by protection act value and time coordinations
Ensure.Its protection act arranges and is usually by escaping this protection circuit end maximum short circuit electricity
The method of stream carries out calculating, and calculation of short-circuit current is calculated as follows:
Wherein, IkFor the fault curre at protection current under minimum operational mode,For system
The phase electromotive force of equivalent source, ZsFor the impedance between protection installation place to system equivalent source, Zk
For the impedance between short dot to protection installation place.
The generally motor load in circuit is simply equivalent to inductive impedance often in calculating, and
And not considering the impact on protection of its feedback current, these are many, short for circuit upper motor load
During road, the protection of the distribution line that feedback current is big is the most unfavorable, it is difficult to ensure the selectivity of protection,
It is likely to result in false protection, expansion accident scope.
To this end, the present invention provides a kind of distribution protection method, comprise the steps: currently to protect
When protecting line failure, calculate the initial setting current value at current protection circuit head end；Meter
Calculate the maximum rear end motor feedback currents value at current protection circuit head end；Calculate current protection
The fault curre under minimum operational mode at circuit head end；Take at current protection circuit head end
Under described initial setting current value, maximum rear end motor feedback currents value, minimum operational mode
Fault curre in maximum as the setting current value of current protection circuit.Illustrate below right
The distribution protection method citing that the present invention provides launches detailed description.
In one embodiment of the invention, in the power distribution network having a large amount of motor load, when
Circuit is segmented switch (or claim Intelligent power distribution terminal FTU) when being divided into multistage, if therein
During the line failure that one block switch is protected (usually phase to phase fault), need root
Setting current value according to the adjustment of load current fragment switch in the circuit of current protection.
First, introduction calculates the step of the initial setting current value at current protection circuit head end.
Setting to the initial setting current value of protection each in distribution, need to be by under minimum operational mode
During this section of line end generation phase to phase fault, the fault current of this section of circuit head end is divided by reliable system
Number obtains the initial setting current value at current protection circuit head end.Wherein, safety factor be by
Professional and technical personnel sets according to daily experience.The fault current of this section of circuit head end by with
Under type calculates:
Wherein, Ip (2)For the fault curre of current protection circuit head end, ishRush for three-phase fault
Hit current peak.
Below in conjunction with physical circuit fault diagnosis example explanation.
As in figure 2 it is shown, distribution line is powered by single supply S1, block switch A, B, C are equal
There is protective relaying device, with motor load in circuit.When line end K1 occurs biphase
During short trouble, due to the impact of motor feedback currents, the fault current at protection C is less than
End fault electric current.Therefore, when the setting current value of protection C is this section of line end fault,
Fault current at circuit head end i.e. C obtains divided by safety factor.
Secondly, the maximum rear end motor feedback currents calculated at current protection circuit head end is introduced
Value；
Maximum rear end motor feedback currents at current protection circuit head end can be according to passing through
Motor factory-said value determines or by obtaining motor modeling and simulating.
As in figure 2 it is shown, distribution line is powered by single supply S1, block switch A, B, C are equal
There is protective relaying device, with motor load in circuit.When line end K1 occurs biphase
During short trouble, at protection C, during fault, (this circuit head end) maximum rear end feedback current is
Obtained by modeling and simulating.The feedback current that when ensureing head end fault, rear end motor produces will not draw
Play the malfunction of C protection.
Again, the fault curre under the minimum operational mode at current protection circuit head end is calculated；
Under minimum operational mode, during line end generation two-phase short-circuit fault, flow through at this protection
Fault current.Under minimum operational mode, the fault curre at current protection is by with lower section
Formula calculates:
Wherein, IkFor the fault curre at protection current under minimum operational mode,For system
The phase electromotive force of equivalent source, ZsFor the impedance between protection installation place to system equivalent source, Zk
For the impedance between short dot to protection installation place.
Occur as in figure 2 it is shown, calculate this section of line end under minimum operational mode in a manner described
The fault current at C is protected during two-phase short-circuit fault.
Whether protection C is produced action verify, it is ensured that circuit is end under minimum operational mode
End occurs to protect C not tripping during line to line fault.Specifically, there is no the situation of motor load
Under minimum operational mode lower end occur two short circuit time C whether produce corresponding action.
Finally, the step of the setting current setting value choosing current protection circuit is introduced.
In order to ensure reliability and the selectivity that current protection circuit protected by protection device, need
The setting current setting value of current protection device is made corresponding selection.To current protection circuit
When setting current setting value selects, it is necessary to ensure when current protection circuit breaks down, calculate
The feedback current that during current protection circuit head end fault, rear end motor produces will not cause current guarantor
Protect the protection device malfunction of circuit.Should also be as must assure that current protection circuit is in minimum operation side
The protection device not tripping of current protection circuit during formula lower end generation line to line fault.Therefore, when
The setting current setting value of front protection circuit should be more than the maximum rear end electricity of current protection circuit
Motivation feedback current, and occur more than line end under current protection circuit minimum operational mode
The fault current at this protection place during line to line fault.Below in conjunction with physical circuit fault diagnosis example explanation.
As in figure 2 it is shown, distribution line is powered by single supply S1, block switch A, segmentation are left
Close B, block switch C and all have protective relaying device, with motor load in circuit.Work as line
When there is two-phase short-circuit fault in road end K1, it is ensured that the feedback current that rear end motor produces will not
Cause the malfunction that block switch C protects.Ensure that circuit occurs two at minimum operational mode lower end
Protection block switch C not tripping during short circuit mutually.
In like manner, block switch A, the setting method of block switch B and adjusting of block switch C
Method is identical, time equally with line end K1 short circuit, and this section of i.e. block switch A of circuit head end
Obtain divided by safety factor with the fault current at block switch B.And with maximum rear end motor
Short circuit current when feedback current, minimum operational mode lower end generation line to line fault compares,
Take and set as the setting current of block switch A, block switch B more than or equal to the value of above-mentioned three
Definite value, detailed process is with reference to the setting current setting value of above block switch C, at this most not
Repeat the most one by one.
In another embodiment of the present invention, may in ring distribution system when same protection
When different running method occurs, protection device setting current setting side under different running method
Method is essentially identical with above-described embodiment, and its difference is, obtain under different running method is same
The different setting current setting values of protection device, select the minimum same protection device of conduct not
Definite value is set with the setting current under the method for operation.Below in conjunction with physical circuit fault diagnosis example explanation.
As it is shown on figure 3, for loop network distribution line hand in hand, block switch A, block switch
B, block switch D, block switch E are normally closed switch, and interconnection switch C is normal open switch.
Circuit AC, EC are powered by power supply S1 and S2 respectively.With block switch B in difference operation side
Different setting current setting values I of the same protection device obtained under formulaB1、IB2、IB2, select
IB1、IB2、IB2Middle minimum as same protection device current settings under different running method
Illustrate as a example by the adjusting of definite value.
According to the method described above block switch B is adjusted when circuit is properly functioning, electricity of adjusting
Flow valuve is IB1；When AB section line fault, block switch A disconnects C Guan Bi, and BC circuit is by separately
Outer side power supply S2 powers, and now block switch B changes the operation side originally powered by S1
Formula, changes into being powered by S2, and its line load situation changes, the most according to the method described above
Adjusting block switch B again, setting valve is IB2；When DE section line fault, segmentation is opened
Closing E to disconnect, interconnection switch C closes, and circuit CD is powered by opposite side power supply S1, this time-division
Duan Kaiguan B is in again under the third method of operation, and line load situation changes again, then weighs
Newly adjusting it, setting valve is IB3.In order to make block switch B in different running method
Lower all energy precision maneuver, selects IB1、IB2、IB3Middle minima is the most whole of block switch B
Definite value.
In like manner, block switch A, block switch D, the setting method of block switch E and segmentation
The setting method of switch B is identical, time equally with line end K1 short circuit, and this section of circuit head end
Fault current at i.e. block switch A and block switch D, block switch E is divided by safety factor
Obtain.And occur biphase with maximum rear end motor feedback currents, minimum operational mode lower end
Short circuit time short circuit current compare take more than or equal to above-mentioned three value as block switch A,
Block switch D, the setting current setting value of block switch E, detailed process is with reference to above dividing
The setting current setting value of Duan Kaiguan B, repeats the most one by one at this.
In sum, a kind of distribution protection method that the present invention provides, decrease motor anti-
The supply current impact on non-fault line protection device, can also be run difference by the method
Under mode, the protection seting of same block switch is identical value, not only simplify the side of adjusting of protection
Method also substantially increases reliability and the selectivity of protection, and the method is applicable to have automatization's merit
Can, the power distribution network of many block switches, to power distribution network safe and reliable operation and automatization and intellectuality
Development all has great importance.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, relevant
The those of ordinary skill of technical field, without departing from the spirit and scope of the present invention,
Can also make a variety of changes and modification, the technical scheme of the most all equivalents falls within the present invention
Category, the scope of patent protection of the present invention should be defined by the claims.
Claims (6)
1. a distribution protection method, it is characterised in that comprise the steps:
When current protection circuit breaks down,
Calculate the initial setting current value at current protection circuit head end；
Calculate the maximum rear end motor feedback currents value at current protection circuit head end；
Calculate the fault curre under the minimum operational mode at current protection circuit head end；
Take initial setting current value described at current protection circuit head end, maximum rear end motor anti-
In fault curre under feed flow valuve, minimum operational mode, maximum is as current protection circuit
Setting current setting value.
2. distribution protection method as claimed in claim 1, it is characterised in that described work as
Initial setting current value at front protection circuit head end calculates in the following manner:
When current protection circuit breaks down the fault curre of current protection circuit head end with can
Take what business obtained by coefficient.
3. distribution protection method as claimed in claim 2, it is characterised in that described work as
The fault curre of front protection circuit head end calculates in the following manner:
Wherein, Ip (2)For the fault curre of current protection circuit head end, ishRush for three-phase fault
Hit current peak.
4. distribution protection method as claimed in claim 1, it is characterised in that described electricity
Motivation feedback current is to be determined by motor factory-said value or by obtaining motor modeling and simulating
's.
5. distribution protection method as claimed in claim 1, it is characterised in that described
Under the little method of operation, the fault curre at current protection calculates in the following manner:
Wherein, IkFor the fault curre at protection current under minimum operational mode,For system
The phase electromotive force of equivalent source, ZsFor the impedance between protection installation place to system equivalent source, Zk
For the impedance between short dot to protection installation place.
6. the distribution protection method as described in claim 1-5 any one, its feature exists
In, it is additionally included in same protection device setting current under different running method in power distribution network and sets
The determination step of value:
The different setting current setting values of the same protection device obtained under different running method, choosing
Select minimum as the same protection device whole current settings definite value under different running method.
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| CN201510296725.4A CN106300302B (en) | 2015-06-02 | 2015-06-02 | A kind of distribution protection method |
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| CN106300302B CN106300302B (en) | 2018-06-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298289A (en) * | 2018-11-29 | 2019-02-01 | 广东电网有限责任公司 | Localization method, system and the electronic equipment of distribution network failure point |
| CN109670654A (en) * | 2019-01-09 | 2019-04-23 | 国网江西省电力有限公司电力科学研究院 | A kind of automatic identification distribution line protection rational method of definite value |
| CN111371075A (en) * | 2019-12-26 | 2020-07-03 | 国网北京市电力公司 | Feeder protection processing method, storage medium and processor |
| CN114725941A (en) * | 2022-06-09 | 2022-07-08 | 沈阳易鑫泰电力科技有限公司 | Rural overhead power distribution network frame reconstruction system and automatic reconstruction method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418281C (en) * | 2006-10-16 | 2008-09-10 | 黑龙江大学 | Method for realizing self adaptive current quick break protection of power supply circuit |
| CN103474949B (en) * | 2013-08-07 | 2016-12-28 | 南京因泰莱配电自动化设备有限公司 | The setting method of a kind of self adaptation three section protection and device |
| CN104319738B (en) * | 2014-10-17 | 2017-05-17 | 国家电网公司 | Protection setting calculation model for high-voltage variable-frequency motor |
-
2015
- 2015-06-02 CN CN201510296725.4A patent/CN106300302B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298289A (en) * | 2018-11-29 | 2019-02-01 | 广东电网有限责任公司 | Localization method, system and the electronic equipment of distribution network failure point |
| CN109670654A (en) * | 2019-01-09 | 2019-04-23 | 国网江西省电力有限公司电力科学研究院 | A kind of automatic identification distribution line protection rational method of definite value |
| CN109670654B (en) * | 2019-01-09 | 2022-08-16 | 国网江西省电力有限公司电力科学研究院 | Method for automatically identifying rationality of protection setting value of distribution network line |
| CN111371075A (en) * | 2019-12-26 | 2020-07-03 | 国网北京市电力公司 | Feeder protection processing method, storage medium and processor |
| CN114725941A (en) * | 2022-06-09 | 2022-07-08 | 沈阳易鑫泰电力科技有限公司 | Rural overhead power distribution network frame reconstruction system and automatic reconstruction method |
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| Publication number | Publication date |
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| CN106300302B (en) | 2018-06-15 |
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