CN106655118B - Zero sequence inverse-time overcurrent protection accelerated method towards double-circuit line on same pole adjacent lines - Google Patents
Zero sequence inverse-time overcurrent protection accelerated method towards double-circuit line on same pole adjacent lines Download PDFInfo
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- CN106655118B CN106655118B CN201610986508.2A CN201610986508A CN106655118B CN 106655118 B CN106655118 B CN 106655118B CN 201610986508 A CN201610986508 A CN 201610986508A CN 106655118 B CN106655118 B CN 106655118B
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses the zero sequence inverse-time overcurrent protection accelerated methods towards double-circuit line on same pole adjacent lines, comprising: calculates whether adjacent lines protection occurs critical fault position corresponding to malfunction according to obtained zero sequence impedance value；The zero-sequence current for flowing through the zero sequence inverse time-lag protection of faulty line both ends when failure betides critical fault position is calculated, the actuation time of faulty line both ends protection is calculated；The actuation time protected on the adjacent lines of double loop two sides should increase a time delays on this basis；The time setting coefficient of double loop two sides adjacent lines protection after finding out adjusting；Also disclose the speeding scheme of the adjacent lines zero sequence inverse-time overcurrent protection based on zero-sequence current variation.The invention has the advantages that: the original performances for not influencing inverse time-lag protection, and when speeding scheme can not work normally because of a variety of causes, zero sequence inverse-time overcurrent protection itself remains to be operating normally, and ensure that the reliability of failure removal.
Description
Technical field
The present invention relates to field of relay protection in power more particularly to a kind of power transmission networks towards double circuits on same tower cable architecture
The faulty action preventing method and acceleration protection method of zero sequence inverse-time overcurrent protection.
Background technique
Zero sequence inverse-time overcurrent protection has the unique advantage of inverse time lag, that is, electric current and the protection for flowing through protection installation place are dynamic
It is inversely proportional as the time, therefore when it does back-up protection can obtain higher sensitivity, the application in high-voltage fence is also increasingly
Extensively.When ground fault occurs for electric system, zero sequence equivalent source is located at fault point, remoter away from fault point distance, flows through
Zero-sequence current is smaller, therefore zero sequence inverse-time overcurrent protection can be protected according to the NATURAL DISTRIBUTION characteristic of zero-sequence current under normal circumstances
Hold the selectivity of movement.This is also the reason of current the whole network in practical applications is using same anti-time limit characteristic curve.
In recent years, in order to reducing the construction costs, reduce land seizure area and increase transmission line capability, double-circuit line on same pole transmission of electricity
System is more and more widely used.However, the distribution of zero-sequence current is special when double circuits on same tower cable architecture is by ground fault
Property generate significant impact.When system line parameter and abort situation meet specified conditions, protected on the adjacent lines of double loop two sides
The selectivity of shield may be unable to satisfy, and the case where adjacent lines protection is prior to faulty line protection act occur.In double circuits on same tower
When Corridor Building of transmitting electricity is increasingly intensive, adjacent lines false protection has become urgently to be resolved in zero sequence inverse time-lag protection application
Problem.
It discloses in the prior art and increases additional delay on anti-time limit characteristic, as the benefit of ground distance protection
It fills, is only used for excision high resistance earthing fault.Although the program solves the problems, such as zero sequence inverse time-lag protection malfunction, but artificial increase
The action delay of protection, limits the application range of zero sequence inverse time-lag protection, is unfavorable for giving full play to zero sequence inverse time-lag protection
Advantage.
It discloses in the prior art and residual voltage value and each is obtained when failure occurs at each endpoint by Wide Area Measurement System
Thus the minimum value of endpoint residual voltage calculates the numerical value of voltage accelerated factor, and electricity is introduced in anti-time limit characteristic expression formula
Accelerated factor is pressed to change the actuation time of each protection, so that each protection be made to meet selective requirement；Or add introducing voltage
The reactance factor is further introduced on the basis of the fast factor to avoid adjacent lines false protection.Above scheme can be according to practical feelings
The actuation time of condition adjustment protection, but need to realize that difficulty is larger, higher cost, it is difficult in actual field using Wide-area Measurement Information
Middle popularization and application.
Summary of the invention
The purpose of the present invention is to solve the above-mentioned problems, proposes a kind of power transmission network towards double circuits on same tower cable architecture
The faulty action preventing method and acceleration protection method of zero sequence inverse-time overcurrent protection, this method is by changing double loop adjacent lines zero
Sequence inverse time-lag protection time setting coefficient is to avoid malfunction；The accelerated motion scheme changed based on zero-sequence current is proposed simultaneously,
The delay of adjacent lines protection act is longer when for solving the problems, such as adjacent lines failure after adjusting again.
To achieve the above object, concrete scheme of the invention is as follows:
A kind of zero sequence inverse-time overcurrent protection faulty action preventing method towards double circuits on same tower cable architecture, comprising:
(1) the zero sequence impedance value for obtaining double-circuit line on same pole two sides route respectively, calculates according to obtained zero sequence impedance value
Whether adjacent lines protection occurs critical fault position alpha corresponding to malfunction；
(2) zero sequence that the zero sequence inverse time-lag protection of faulty line both ends is flowed through when failure betides critical fault position alpha is calculated
Electric current, and the actuation time that faulty line both ends are protected is calculated according to selected anti-time limit characteristic curve；
(3) according to the actuation time for the faulty line both ends protection being calculated, to avoid malfunction, double loop two sides are adjacent
The actuation time protected on route should increase a time delays Δ t on this basis；
(4) actuation time protected on the adjacent lines of double loop two sides is substituted into anti-time limit characteristic expression formula respectively, is found out
The time setting coefficient of double loop two sides adjacent lines protection after adjusting；
(5) above-mentioned time setting coefficient is set to the time setting coefficient of double loop two sides adjacent lines protection, thus
Avoid the protection on the adjacent lines of double circuit lines route two sides that malfunction occurs.
Further, in the step (1), the determination method of critical fault position alpha are as follows:
The zero sequence impedance value of double-circuit line on same pole left-sided system is denoted as ZL, the zero sequence impedance value of right-sided system is denoted as ZR, critical
Abort situation α are as follows:
Further, in the step (3), the actuation time that faulty line left end is protected is denoted as tL, right end protection
Actuation time is denoted as tR, then the left and right sides adjacent lines protection actuation time are as follows:
tL1=tL+ Δ t, tR1=tR+Δt。
One kind is towards double circuits on same tower cable architecture for adjacent lines zero sequence inverse-time overcurrent protection accelerated motion method, packet
It includes:
It sets and protected circuit is directed toward as positive direction by bus；
On the basis of the zero sequence inverse-time overcurrent protection method towards double circuits on same tower cable architecture, for adjacent lines
For protection, when troubles inside the sample space occurs, flowing through the zero-sequence current at adjacent lines protection will be increased after the protection act of opposite end
Subtract, but can't disappear；
For external area error, flowing through the zero-sequence current at adjacent lines protection will disappear after faulty line protection act；
If failure betides inside double loop, due to having pressed the zero sequence inverse-time overcurrent protection towards double circuits on same tower cable architecture
Faulty action preventing method adjusts the actuation time that adjacent lines is protected again, therefore double loop outer protection will not move
Make, excision failure will be acted by double loop internal protection, will be disappeared thereafter through the zero-sequence current at adjacent lines protection；At this time
Delay t can be determined according to the actuation time of double loop internal protection3Value, through be delayed t3After time, if at adjacent lines protection
Zero-sequence current there are still, that is, think abort situation not inside double loop, at this time immediately to adjacent lines protection act carry out
Accelerate, cuts off failure.
It is described to accelerate motion method since internal fault be moved normally for adjacent lines zero sequence inverse-time overcurrent protection
When making, each zero sequence inverse-time overcurrent protection is remained to according to zero towards double circuits on same tower cable architecture in double circuits on same tower cable architecture
Sequence inverse-time overcurrent protection faulty action preventing method keeps correct movement.
Beneficial effects of the present invention:
(1) faulty action preventing and speeding scheme clear principle of the present invention, it is convenient to realize.It is possible to prevente effectively from adjacent lines is protected
Malfunction is protected, and without increasing wide area measurement equipment, it is at low cost；
(2) use speeding scheme of the present invention, may be implemented no matter double loop or double loop adjacent lines failure, equal energy
Guarantee that the selectivity protected everywhere and quick-action are unaffected.
(3) faulty action preventing and speeding scheme of the present invention do not influence original performance of inverse time-lag protection, speeding scheme because
When a variety of causes can not work normally, zero sequence inverse-time overcurrent protection itself remains to be operating normally, and ensure that failure removal can
By property.
Detailed description of the invention
Fig. 1 is the power transmission network partial model Parameter Map of the cable architecture containing double circuits on same tower；
Fig. 2 is zero sequence inverse-time overcurrent protection faulty action preventing adjusting schematic diagram of the present invention；
Fig. 3 is double back cable architecture and abort situation schematic diagram；
Fig. 4 is adjacent lines protection speeding scheme logical schematic of the present invention.
Specific embodiment:
The present invention is described in detail with reference to the accompanying drawing:
The zero sequence inverse-time overcurrent protection method towards double circuits on same tower cable architecture that the invention discloses a kind of, i.e. change time
The faulty action preventing fitting method of tuning coefficient, comprising:
(1) the zero sequence impedance value for obtaining double-circuit line on same pole two sides route respectively, calculates according to obtained zero sequence impedance value
Whether adjacent lines protection occurs critical fault position alpha corresponding to malfunction；
The determination method of critical fault position alpha are as follows:
The zero sequence impedance value of double-circuit line on same pole left-sided system is denoted as ZL, the zero sequence impedance value of right-sided system is denoted as ZR, critical
Abort situation α are as follows:
(2) it calculates when failure betides critical fault position alpha and flows through faulty line both ends zero sequence inverse-time overcurrent protection
Zero-sequence current, and the actuation time that faulty line both ends are protected is calculated according to selected anti-time limit characteristic curve；
(3) according to the actuation time for the faulty line both ends protection being calculated, to avoid malfunction, double loop two sides are adjacent
The actuation time protected on route should increase a time delays Δ t on this basis；
The actuation time that faulty line left end is protected is denoted as tL, right end protection actuation time be denoted as tR, then the left and right sides
The actuation time of adjacent lines protection are as follows:
tL1=tL+ Δ t, tR1=tR+Δt。
(4) actuation time protected on the adjacent lines of double loop two sides is substituted into anti-time limit characteristic expression formula respectively, is found out
The time setting coefficient of double loop two sides adjacent lines protection after adjusting；
(5) above-mentioned time setting coefficient is set to the time setting coefficient of double loop two sides adjacent lines protection, thus
Avoid the protection on the adjacent lines of double circuit lines route two sides that malfunction occurs.
In Fig. 1, A~D is bus, ZL10、ZL20、ZAB0、ZDC0For the zero sequence impedance of each route, ZM0The zero sequence between double loop
Mutual inductance, ZA0、ZD0The respectively zero sequence impedance of two side systems.IF0For fault point zero-sequence current, IAB0、IB10、IB20、IC10、IC20With
IDC0Respectively each route zero-sequence current.Assuming that K point, abort situation α on route 2, which occur, for failure is defined as fault point away from bus B
Length and the ratio between 2 overall length of route, therefore 0 < α < 1.Rectangle frame with number in figure indicates that each zero sequence inverse time-lag protection (fills
Have zero sequence power direction element) installation site and to inductive switch.
After ground fault occurs, each branch zero-sequence current direction can be indicated by arrow in Fig. 1, but zero sequence on parallel circuit 1
Electric current is influenced by both end voltage and direction is indefinite.WhenWhen (wherein ZA+ZABAs ZL, ZD+ZCFor
ZR), zero-sequence current direction and I on route 1 at this timeB10It is identical, that is, there is IAB0=IB10+IC10Relationship, therefore adjacent lines AB
On protection 1 can prior to faulty line protection 5 movement；Similarly, whenWhen, it protects on adjacent lines DC
Prior to 6 movement of faulty line protection malfunction can occur for shield 8.
The faulty action preventing fitting method for changing time setting coefficient is as shown in Figure 2.Traditional zero sequence inverse time-lag protection is using system
One same characteristic inverse-time curve, is indicated with curve A.Break down in parallel circuit 2 andWhen,
Non-zero-sequence current on route 1, this i.e. adjacent lines protection 1 and 8 whether the critical point of malfunction.To ensure double loop and adjacent lines
The cooperation of protection, needs to improve the action delay of protection 1 with protection 8, and corresponding acting characteristic curve is indicated with B, C respectively.It is whole
Steps are as follows for devise a stratagem calculation:
(1) the zero-sequence current I that protection 5 and 6 is flowed through when critical point short circuit is found outp5With Ip6, acquire the respective action timeWith
(2) to avoid malfunction, protect for 1 actuation time should be at this timeSimilarly, protect for 8 actuation time answer
For
(3) willWithInverse iteration enters anti-time limit characteristic expression formula, finds out new time setting coefficient T DS1With TDS8。
2. a kind of adjacent lines based on zero-sequence current variation protects accelerated motion scheme, comprising:
It sets and protected circuit is directed toward as positive direction by bus；
On the basis of the zero sequence inverse-time overcurrent protection method towards double circuits on same tower cable architecture, for adjacent lines protection
Speech, when positive external area error occurs, due to having been carried out again by zero sequence inverse-time overcurrent protection method to adjacent lines protection
Adjusting, therefore faulty line protection can be acted first, be disappeared thereafter through the zero-sequence current of adjacent lines protection；
When positive troubles inside the sample space occurs, the zero-sequence current for flowing through adjacent lines protection can be sent out after the protection act of route opposite end
Changing, but not disappear；
When double-circuit line internal fault occurs, due to being protected according to the zero sequence inverse-time overcurrent towards double circuits on same tower cable architecture
Shield faulty action preventing method adjusts adjacent lines protection again, therefore adjacent lines protection will not be prior to protecting inside double loop
Shield movement；After double loop internal protection acts excision failure, the zero-sequence current flowed through at adjacent lines protection will be because of failure quilt
It cuts off and disappears；
To sum up, when troubles inside the sample space occurs, flowing through the zero-sequence current at adjacent lines protection will have after the protection act of opposite end
Increased and decreased, but can't be disappeared.For external area error, flowing through the zero-sequence current at adjacent lines protection will protect in faulty line
It disappears after movement.If failure betides inside double loop, adjacent lines is protected due to having pressed the method actuation time
Again it is adjusted, therefore double loop outer protection will not act, excision failure will be acted by double loop internal protection, this
Flowing through the zero-sequence current at adjacent lines protection afterwards will disappear.It can be determined according to the actuation time of double loop internal protection at this time
Be delayed t3Value, through be delayed t3After time, if there are still think that abort situation does not exist to the zero-sequence current at adjacent lines protection
Inside double loop, adjacent lines protection act is accelerated immediately at this time, cuts off failure.
Program structural schematic diagram such as Fig. 4, below in conjunction with the performance of Fig. 3 concrete analysis speeding scheme.
As K outside zones of inversions4When point failure, protect 1 zero sequence power direction element that can be judged to reverse direction failure, therefore protect
1 is failure to actuate.
As K outside forward region3When point failure, due to being protected according to the zero sequence inverse-time overcurrent towards double circuits on same tower cable architecture
Shield faulty action preventing method adjusts protection 8 again, therefore it will not be acted, and protects 7 will take the lead in acting excision failure at this time.
It will disappear thereafter through the zero-sequence current of protection 1, protection 1 is returned and is failure to actuate.And 2 are protected due to being judged to opposite direction, it keeps
It is motionless.
As K in double loop2When point failure, due to being protected according to the zero sequence inverse-time overcurrent towards double circuits on same tower cable architecture
Shield faulty action preventing method adjusts protection 1 and protection 8 again, therefore it will not be acted；And for protection 2 and 7,
The zero sequence power direction measured is opposite direction, therefore will not be acted.To sum up, double-circuit line outer protection will not miss at this time
It is dynamic.After double loop internal fault route both ends protection act cuts off failure, the zero-sequence current that adjacent lines protects 1 and 8 is flowed through
It will disappear, therefore remain stationary because failure is removed.
As K in forward region1When point failure, protection 2 due to lesser action delay will prior to protection 1 movement, this
Though the zero-sequence current for flowing through protection 1 afterwards is increased and decreased but not is completely disappeared because the structure of zero-sequence network changes, at this time
The accelerated motion condition of protection 1,1 accelerated motion excision failure of protection will be met.
To sum up, ground fault anywhere occurs, the accelerated motion scheme of adjacent lines protection can guarantee avoiding area
Under the premise of outer failure malfunction, failure is cut off rapidly in troubles inside the sample space.
It should be noted that faulty action preventing of the present invention and speeding scheme do not influence original performance of inverse time-lag protection,
When speeding scheme can not work normally because of a variety of causes, zero sequence inverse-time overcurrent protection itself remains to be operating normally, and ensure that event
Hinder the reliability of excision.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (1)
1. a kind of be directed to adjacent lines zero sequence inverse-time overcurrent protection accelerated motion method, feature towards double circuits on same tower cable architecture
It is, comprising:
Zero sequence inverse-time overcurrent protection faulty action preventing method towards double circuits on same tower cable architecture:
(1) the zero sequence impedance value for obtaining double-circuit line on same pole two sides route respectively calculates adjacent according to obtained zero sequence impedance value
Whether route protection occurs critical fault position alpha corresponding to malfunction；
(2) zero-sequence current that the zero sequence inverse time-lag protection of faulty line both ends is flowed through when failure betides critical fault position alpha is calculated,
And the actuation time of faulty line both ends protection is calculated according to selected anti-time limit characteristic curve；
(3) according to the actuation time for the faulty line both ends protection being calculated, to avoid malfunction, double loop two sides adjacent lines
The actuation time of upper protection should increase a time delays Δ t on this basis；
(4) actuation time protected on the adjacent lines of double loop two sides is substituted into anti-time limit characteristic expression formula respectively, finds out adjusting
The time setting coefficient of double loop two sides adjacent lines protection afterwards；
(5) above-mentioned time setting coefficient is set to the time setting coefficient of double loop two sides adjacent lines protection, to avoid
Malfunction occurs for the protection on the adjacent lines of double circuit lines route two sides；
It sets and protected circuit is directed toward as positive direction by bus；
On the basis of the zero sequence inverse-time overcurrent protection faulty action preventing method towards double circuits on same tower cable architecture, for adjacent lines
For protection, when troubles inside the sample space occurs, flowing through the zero-sequence current at adjacent lines protection will be increased after the protection act of opposite end
Subtract, but can't disappear；
For external area error, flowing through the zero-sequence current at adjacent lines protection will disappear after faulty line protection act；
If failure betides inside double loop, due to having pressed the zero sequence inverse-time overcurrent protection towards double circuits on same tower cable architecture
Faulty action preventing method adjusts the actuation time that adjacent lines is protected again, therefore double loop outer protection will not move
Make, excision failure will be acted by double loop internal protection, will be disappeared thereafter through the zero-sequence current at adjacent lines protection；At this time
Delay t can be determined according to the actuation time of double loop internal protection3Value, through be delayed t3After time, if at adjacent lines protection
Zero-sequence current there are still, that is, think abort situation not inside double loop, at this time immediately to adjacent lines protection act carry out
Accelerate, cuts off failure；
When K4 point failure outside zones of inversions, protect 1 zero sequence power direction element that can be judged to reverse direction failure, therefore protection 1 is not
Movement；
When K3 point failure outside forward region, since the zero sequence inverse-time overcurrent according to described towards double circuits on same tower cable architecture is protected
Shield faulty action preventing method adjusts protection 8 again, therefore it will not be acted, and protects 7 will take the lead in acting excision failure at this time；
It will disappear thereafter through the zero-sequence current of protection 1, protection 1 is returned and is failure to actuate；And 2 are protected due to being judged to opposite direction, it keeps
It is motionless；
When K2 point failure in double loop, since the zero sequence inverse-time overcurrent according to described towards double circuits on same tower cable architecture is protected
Shield faulty action preventing method adjusts protection 1 and protection 8 again, therefore it will not be acted；And for protection 2 and 7,
The zero sequence power direction measured is opposite direction, therefore will not be acted；
When K1 point failure in forward region, hereafter protection 2 with lesser action delay prior to 1 movement of protection due to that will flow
Though the zero-sequence current of overprotection 1 is increased and decreased but not completely disappeared because the structure of zero-sequence network changes, will expire at this time
The accelerated motion condition of foot protection 1,1 accelerated motion excision failure of protection；
It is described for adjacent lines zero sequence inverse-time overcurrent protection accelerated motion method can not be operating normally due to internal fault when,
Each zero sequence inverse-time overcurrent protection remains to anti-according to the zero sequence towards double circuits on same tower cable architecture in double circuits on same tower cable architecture
Time limit overcurrent protection faulty action preventing method keeps correct movement.
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| CN107528287B (en) * | 2017-09-30 | 2018-12-28 | 华中科技大学 | A kind of optimization method and system of inverse time-lag protection |
| CN107742878B (en) * | 2017-10-20 | 2019-06-28 | 国家电网公司华中分部 | A kind of inverse time lag zero-sequence protection method |
| CN107863764B (en) * | 2017-11-14 | 2019-07-12 | 国家电网公司华中分部 | A kind of station domain back-up protection method based on anti-time limit characteristic |
| CN110739669B (en) * | 2019-10-30 | 2021-06-29 | 三峡大学 | Inverse time limit overcurrent protection method based on impedance correction |
| CN111769523B (en) * | 2020-06-19 | 2022-07-19 | 中国南方电网有限责任公司 | Series compensation-containing double-circuit line inverse time-lag zero-sequence current protection setting method |
| CN111740379B (en) * | 2020-07-01 | 2022-09-30 | 北京四方继保自动化股份有限公司 | Method for automatically adjusting zero sequence protection two-segment and three-segment time constant values on line |
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| Operational analysis of zero-sequence inverse-time overcurrent protection in parallel double-circuit transmission lines;张子衿等;《Power and Energy Engineering Conference (APPEEC), 2016 IEEE PES Asia-Pacific》;20161028;第491-495页 |
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