CN106655118A - Acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines - Google Patents
Acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines Download PDFInfo
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- CN106655118A CN106655118A CN201610986508.2A CN201610986508A CN106655118A CN 106655118 A CN106655118 A CN 106655118A CN 201610986508 A CN201610986508 A CN 201610986508A CN 106655118 A CN106655118 A CN 106655118A
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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 an acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines. The method includes calculating a critical failure position of false action of adjacent line protection according to an obtained zero sequence impedance value; calculating zero sequence inverse time limit protection zero sequence current flowing through the two ends of a failure line when a failure occurs at the critical failure position and calculating the action time of failure line two end protection; calculating the action time of protection of adjacent lines on two sides of the two-circuit lines by adding a time delay to the action time of failure line two end protection; solving a time setting coefficient of protection of adjacent lines on two sides of the two-circuit lines after a setting process. The invention also discloses a zero sequence current change based acceleration scheme for zero sequence inverse time limit overcurrent protection of the adjacent lines. The invention has beneficial effects that prior performance of inverse time limit protection is not affected; and normal action of zero sequence inverse time limit protection is enabled when a prior acceleration scheme cannot work due to different reasons, so that failure elimination reliability is ensured.
Description
Technical field
The present invention relates to field of relay protection in power, more particularly to 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.
Background technology
Zero sequence inverse-time overcurrent protection has the unique advantage of inverse time lag, that is, the electric current for flowing through protection installation place is dynamic with protection
It is inversely proportional to as the time, therefore it can obtain higher sensitivity when doing back-up protection, the application in high-voltage fence is also increasingly
Extensively.When power system occurs earth fault, zero sequence equivalent source is located at fault point, and away from trouble point, distance is more remote, flows through
Zero-sequence current is less, therefore generally zero sequence inverse-time overcurrent protection can be protected according to the NATURAL DISTRIBUTION characteristic of zero-sequence current
Hold the selectivity of action.This is also the reason for current the whole network in actual applications uses same anti-time limit characteristic curve.
In recent years, in order to reducing the construction costs, reducing land seizure area and increase transmission line capability, double-circuit line on same pole is transmitted electricity
System has obtained increasingly being widely applied.However, double circuits on same tower cable architecture will be special to the distribution of zero-sequence current during earth fault
Property produce significant impact.When system line parameter and abort situation meet specified conditions, protect on the adjacent lines of double loop both sides
The selectivity of shield possibly cannot meet, and situation of the adjacent lines protection prior to faulty line protection act occur.In double circuits on same tower
When transmission of electricity Corridor Building is increasingly intensive, adjacent lines false protection has become urgently to be resolved hurrily in zero sequence inverse time-lag protection application
Problem.
Disclose in prior art increases additional delay on anti-time limit characteristic, as the benefit of ground distance protection
Fill, be only used for cutting off 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 range of application of zero sequence inverse time-lag protection, is unfavorable for giving full play to zero sequence inverse time-lag protection
Advantage.
Disclose in prior art and residual voltage value and each is obtained when failure occurs at each end points by WAMS
The minimum of a value of end points residual voltage, thus calculates the numerical value of voltage accelerated factor, and electricity is introduced in anti-time limit characteristic expression formula
Press accelerated factor to change the actuation time of each protection, so that each protection meets selective requirement；Or add voltage is introduced
It is further introduced into the reactance factor on the basis of the fast factor to avoid adjacent lines false protection.Such scheme can be according to actual feelings
The actuation time of condition adjustment protection, but need to adopt Wide-area Measurement Information, realize that difficulty is larger, it is relatively costly, it is difficult in actual field
Middle popularization and application.
The content of the invention
The purpose of the present invention is exactly to solve the above problems, it is proposed that 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, the method is by changing double loop adjacent lines zero
Sequence inverse time-lag protection time setting coefficient is so as to avoiding malfunction；The accelerated motion scheme based on zero-sequence current change is proposed simultaneously,
For solving the problems, such as that the time delay of adjacent lines protection act is longer during adjacent lines failure after adjusting again.
For achieving 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, including：
(1) the zero sequence impedance value of double-circuit line on same pole both sides circuit is obtained respectively, is calculated according to resulting zero sequence impedance value
Whether adjacent lines protection there is the critical fault position alpha corresponding to malfunction；
(2) zero sequence that the zero sequence inverse time-lag protection of faulty line two ends is flow through when failure betides critical fault position alpha is calculated
Electric current, and the actuation time of faulty line two ends protection is calculated according to selected anti-time limit characteristic curve；
(3) according to the actuation time of calculated faulty line two ends protection, to avoid malfunction, double loop both sides are adjacent
The actuation time protected on circuit should on this basis increase a time delayses Δ t；
(4) actuation time protected on the adjacent lines of double loop both sides is substituted into respectively anti-time limit characteristic expression formula, is obtained
The time setting coefficient of the double loop both sides adjacent lines protection after adjusting；
(5) above-mentioned time setting coefficient is set to the time setting coefficient of double loop both sides adjacent lines protection, so as to
Avoid the protection on the adjacent lines of double circuit lines circuit both sides that malfunction occurs.
Further, in the step (1), the determination method of critical fault position alpha is：
The zero sequence impedance value of double-circuit line on same pole left-sided system is designated as into ZL, the zero sequence impedance value of right-sided system is designated as ZR, it is critical
Abort situation α is：
Further, in the step (3), the actuation time that faulty line left end is protected is designated as into tL, right-hand member protection
Actuation time is designated as tR, then the left and right sides adjacent lines protection actuation time be：
tL1=tL+ Δ t, tR1=tR+Δt。
It is a kind of to be directed to adjacent lines zero sequence inverse-time overcurrent protection accelerated motion method, bag towards double circuits on same tower cable architecture
Include：
Set and protected circuit is pointed to as positive direction by bus；
It is right on the basis of the zero sequence inverse-time overcurrent protection method towards double circuits on same tower cable architecture described in claim 1
For adjacent lines protection, when there is troubles inside the sample space, the zero-sequence current flow through at adjacent lines protection will be dynamic in opposite end protection
Increase and decrease after work, 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 is betided inside double loop, because method as described in claim 1 is moved to adjacent lines protection
Adjusted again as the time, thus double loop outer protection will not action, will be cut off by the action of double loop internal protection
Failure, will disappear thereafter through the zero-sequence current at adjacent lines protection；Now according to the actuation time of double loop internal protection
Can determine time delay t3Value, Jing time delay t3After time, if the zero-sequence current at adjacent lines protection is still suffered from, that is, failure is thought
Position now accelerates to adjacent lines protection act immediately not inside double loop, cuts off failure.
It is described to accelerate motion method because internal fault be moved normally for adjacent lines zero sequence inverse-time overcurrent protection
When making, in double circuits on same tower cable architecture each zero sequence inverse-time overcurrent protection remain to according to described in claim 1 towards double circuits on same tower
The zero sequence inverse-time overcurrent protection faulty action preventing method of cable architecture keeps correct operation.
Beneficial effects of the present invention：
(1) faulty action preventing of the present invention and speeding scheme clear principle, it is convenient to realize.Adjacent lines guarantor can be prevented effectively from
Shield malfunction, and wide area measurement equipment, low cost need not be increased；
(2) using speeding scheme of the present invention, it is possible to achieve no matter double loop or double loop adjacent lines failure, equal energy
The selectivity that guarantee is protected everywhere is unaffected with quick-action.
(3) faulty action preventing of the present invention and speeding scheme do not affect original performance of inverse time-lag protection, speeding scheme because
A variety of causes cannot normal work when, zero sequence inverse-time overcurrent protection remain in itself regular event, it is ensured that failure removal can
By property.
Description of the drawings
Fig. 1 is the power transmission network partial model Parameter Map containing double circuits on same tower cable architecture；
Fig. 2 is that zero sequence inverse-time overcurrent protection faulty action preventing of the present invention is adjusted schematic diagram；
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：
Below in conjunction with the accompanying drawings the present invention is described in detail：
The invention discloses a kind of zero sequence inverse-time overcurrent protection method towards double circuits on same tower cable architecture, that is, change the time
The faulty action preventing fitting method of tuning coefficient, including：
(1) the zero sequence impedance value of double-circuit line on same pole both sides circuit is obtained respectively, is calculated according to resulting zero sequence impedance value
Whether adjacent lines protection there is the critical fault position alpha corresponding to malfunction；
The determination method of critical fault position alpha is：
The zero sequence impedance value of double-circuit line on same pole left-sided system is designated as into ZL, the zero sequence impedance value of right-sided system is designated as ZR, it is critical
Abort situation α is：
(2) calculate when failure betides critical fault position alpha and flow through faulty line two ends zero sequence inverse-time overcurrent protection
Zero-sequence current, and the actuation time of faulty line two ends protection is calculated according to selected anti-time limit characteristic curve；
(3) according to the actuation time of calculated faulty line two ends protection, to avoid malfunction, double loop both sides are adjacent
The actuation time protected on circuit should on this basis increase a time delayses Δ t；
The actuation time that faulty line left end is protected is designated as into tL, right-hand member protection actuation time be designated as tR, then the left and right sides
Adjacent lines protection actuation time be：
tL1=tL+ Δ t, tR1=tR+Δt。
(4) actuation time protected on the adjacent lines of double loop both sides is substituted into respectively anti-time limit characteristic expression formula, is obtained
The time setting coefficient of the double loop both sides adjacent lines protection after adjusting；
(5) above-mentioned time setting coefficient is set to the time setting coefficient of double loop both sides adjacent lines protection, so as to
Avoid the protection on the adjacent lines of double circuit lines circuit both sides that malfunction occurs.
In Fig. 1, A～D be bus, ZL10、ZL20、ZAB0、ZDC0For the zero sequence impedance of each bar circuit, ZM0For zero sequence between double loop
Mutual inductance, ZA0、ZD0The respectively zero sequence impedance of two side systems.IF0For trouble point zero-sequence current, IAB0、IB10、IB20、IC10、IC20With
IDC0Respectively each circuit zero-sequence current.Assume that failure occurs the K points on circuit 2, abort situation α is defined as trouble point away from bus B
Length and the overall length of circuit 2 ratio, therefore 0 ＜ α ＜ 1.Rectangle frame with numeral in figure represents that each zero sequence inverse time-lag protection (is filled
Have zero sequence power direction element) installation site and to inductive switch.
After earth fault occurs, each branch road zero-sequence current direction can be represented by arrow in Fig. 1, but zero sequence on parallel circuit 1
Electric current is affected by both end voltage and direction is indefinite.WhenWhen (wherein ZA+ZABAs ZL, ZD+ZCFor
ZR), now zero-sequence current direction and I on circuit 1B10It is identical, that is, there is IAB0=IB10+IC10Relation, therefore adjacent lines AB
On protection 1 can prior to faulty line protect 5 actions；In the same manner, whenWhen, protect on adjacent lines DC
Shield 8 can protect 6 actions prior to faulty line, and malfunction occurs.
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 represented with curve A.Break down in parallel circuit 2 andWhen,
Non-zero-sequence current on circuit 1, this is the whether critical point of malfunction of adjacent lines protection 1 and 8.To guarantee double loop and adjacent lines
The cooperation of protection, needs the action delay for improving protection 1 and protection 8, corresponding acting characteristic curve to be represented with B, C respectively.It is whole
Determine calculation procedure as follows：
(1) the zero-sequence current I of protection 5 and 6 is flow through when obtaining critical point short circuitp5With Ip6, try to achieve the respective action timeWith
(2) to avoid malfunction, now protect for 1 actuation time should beIn the same manner, the actuation time of protection 8 should
For
(3) willWithInverse iteration enters anti-time limit characteristic expression formula, obtains new time setting coefficient T DS1With TDS8。
2. a kind of adjacent lines changed based on zero-sequence current protects accelerated motion scheme, including：
Set and protected circuit is pointed to 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 there is positive external area error, has been carried out again due to protecting to adjacent lines by zero sequence inverse-time overcurrent protection method
Adjust, therefore the first action of faulty line protection meeting, disappear thereafter through the zero-sequence current of adjacent lines protection；
During generation forward direction troubles inside the sample space, flowing through the zero-sequence current of adjacent lines protection can send out after the protection act of circuit opposite end
Changing, but will not disappear；
During generation double-circuit line internal fault, due to according to method described in claim 1 adjacent lines is protected into
Go and adjust again, therefore adjacent lines protection will not be prior to double loop internal protection action；When double loop internal protection action
After excision failure, flowing through the zero-sequence current at adjacent lines protection will for some reason hinder removed and disappear；
To sum up, when there is troubles inside the sample space, 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
Disappear after action.If failure is betided inside double loop, adjacent lines is protected due to method as described in claim 1
Actuation time is adjusted again, thus double loop outer protection will not action, will be cut by double loop internal protection action
Except failure, will disappear thereafter through the zero-sequence current at adjacent lines protection.Now according to during the action of double loop internal protection
Between can determine time delay t3Value, Jing time delay t3After time, if the zero-sequence current at adjacent lines protection is still suffered from, that is, event is thought
Barrier position now accelerates to adjacent lines protection act immediately not inside double loop, cuts off failure.
Program structural representation such as Fig. 4, below in conjunction with Fig. 3 the performance of speeding scheme is made a concrete analysis of.
As K outside zones of inversions4During point failure, protecting 1 zero sequence power direction element can be judged to reverse direction failure, therefore protect
1 is failure to actuate.
As K outside forward region3During point failure, due to according to claim 1 method to protection 8 carried out it is again whole
It is fixed, thus its will not action, now protection 7 will take the lead in action excision failure.To 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, therefore remain stationary as.
As K in double loop2During point failure, because the method according to claim 1 is carried out to protection 1 and protection 8
Again adjust, therefore it will not action；And for protection 2 and 7, the zero sequence power direction that it is measured is opposite direction, because
This also will not action.To sum up, now double-circuit line outer protection will not malfunction.Treat that double loop internal fault circuit two ends are protected
After action excision failure, flow through adjacent lines and protect 1 and 8 zero-sequence current for some reason to hinder removed and disappear, therefore keep not
It is dynamic.
As K in forward region1During point failure, protection 2 due to will be prior to protecting 1 action with less action delay, this
Though the zero-sequence current for flowing through protection 1 afterwards has increased and decreased but will not be wholly absent because the structure of zero-sequence network changes, now
The accelerated motion condition of protection 1, the accelerated motion excision failure of protection 1 will be met.
To sum up, anywhere there is earth fault, the accelerated motion scheme of adjacent lines protection can ensure that and avoid area
On 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 affect original performance of inverse time-lag protection,
Speeding scheme because a variety of causes cannot normal work when, zero sequence inverse-time overcurrent protection remain in itself regular event, it is ensured that therefore
The reliability of barrier excision.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (5)
1. a kind of zero sequence inverse-time overcurrent protection faulty action preventing method towards double circuits on same tower cable architecture, is characterized in that, including：
(1) the zero sequence impedance value of double-circuit line on same pole both sides circuit is obtained respectively, calculates adjacent according to resulting zero sequence impedance value
Whether route protection there is the critical fault position alpha corresponding to malfunction；
(2) zero-sequence current that the zero sequence inverse time-lag protection of faulty line two ends is flow through when failure betides critical fault position alpha is calculated,
And the actuation time of faulty line two ends protection is calculated according to selected anti-time limit characteristic curve；
(3) according to the actuation time of calculated faulty line two ends protection, to avoid malfunction, double loop both sides adjacent lines
The actuation time of upper protection should on this basis increase a time delayses Δ t；
(4) actuation time protected on the adjacent lines of double loop both sides is substituted into respectively anti-time limit characteristic expression formula, obtains and adjust
The time setting coefficient of double loop both sides adjacent lines protection afterwards；
(5) above-mentioned time setting coefficient is set to the time setting coefficient of double loop both sides adjacent lines protection, so as to avoid
There is malfunction in the protection on the adjacent lines of double circuit lines circuit both sides.
2. a kind of zero sequence inverse-time overcurrent protection method towards double circuits on same tower cable architecture as claimed in claim 1, its feature
It is that in the step (1), the determination method of critical fault position alpha is：
The zero sequence impedance value of double-circuit line on same pole left-sided system is designated as into ZL, the zero sequence impedance value of right-sided system is designated as ZR, critical fault
Position alpha is：
3. a kind of zero sequence inverse-time overcurrent protection method towards double circuits on same tower cable architecture as claimed in claim 1, its feature
It is in the step (3), the actuation time that faulty line left end is protected to be designated as into tL, right-hand member protection actuation time be designated as tR,
Then the left and right sides adjacent lines protection actuation time be：
tL1=tL+ Δ t, tR1=tR+Δt。
4. one kind is directed to adjacent lines zero sequence inverse-time overcurrent protection accelerated motion method, its feature towards double circuits on same tower cable architecture
It is, including：
Set and protected circuit is pointed to 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 described in claim 1, for phase
For adjacent route protection, when there is troubles inside the sample space, the zero-sequence current flow through at adjacent lines protection will be after the protection act of opposite end
Increase and decrease, 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 is betided inside double loop, during the action protected to adjacent lines due to method as described in claim 1
Between adjusted again, therefore double loop outer protection will not action, will by the action of double loop internal protection cut off failure,
To disappear thereafter through the zero-sequence current at adjacent lines protection；Now can be true according to the actuation time of double loop internal protection
Determine time delay t3Value, Jing time delay t3After time, if the zero-sequence current at adjacent lines protection is still suffered from, that is, think abort situation not
Inside double loop, now adjacent lines protection act accelerated immediately, cut off failure.
5. one kind as claimed in claim 4 adds towards double circuits on same tower cable architecture for adjacent lines zero sequence inverse-time overcurrent protection
Fast method of operating, is characterized in that, described to accelerate motion method due to internal event for adjacent lines zero sequence inverse-time overcurrent protection
When barrier cannot be operating normally, each zero sequence inverse-time overcurrent protection is remained to according to described in claim 1 in double circuits on same tower cable architecture
Zero sequence inverse-time overcurrent protection faulty action preventing method towards double circuits on same tower cable architecture keeps correct operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610986508.2A CN106655118B (en) | 2016-11-09 | 2016-11-09 | Zero sequence inverse-time overcurrent protection accelerated method towards double-circuit line on same pole adjacent lines |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610986508.2A CN106655118B (en) | 2016-11-09 | 2016-11-09 | Zero sequence inverse-time overcurrent protection accelerated method towards double-circuit line on same pole adjacent lines |
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| CN106655118B CN106655118B (en) | 2019-04-09 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528287A (en) * | 2017-09-30 | 2017-12-29 | 华中科技大学 | The optimization method and system of a kind of inverse time-lag protection |
| CN107742878A (en) * | 2017-10-20 | 2018-02-27 | 国家电网公司华中分部 | A kind of inverse time lag zero-sequence protection method |
| CN107863764A (en) * | 2017-11-14 | 2018-03-30 | 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 |
| CN110739669A (en) * | 2019-10-30 | 2020-01-31 | 三峡大学 | inverse time limit overcurrent protection method based on impedance correction |
| CN111740379A (en) * | 2020-07-01 | 2020-10-02 | 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 |
| CN111769523A (en) * | 2020-06-19 | 2020-10-13 | 中国南方电网有限责任公司 | Double-circuit line inverse time limit zero sequence current protection setting method containing series compensation |
-
2016
- 2016-11-09 CN CN201610986508.2A patent/CN106655118B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 张子衿等: "Operational analysis of zero-sequence inverse-time overcurrent protection in parallel double-circuit transmission lines", 《POWER AND ENERGY ENGINEERING CONFERENCE (APPEEC), 2016 IEEE PES ASIA-PACIFIC》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528287A (en) * | 2017-09-30 | 2017-12-29 | 华中科技大学 | The optimization method and system of a kind of inverse time-lag protection |
| 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 |
| CN107742878A (en) * | 2017-10-20 | 2018-02-27 | 国家电网公司华中分部 | A kind of inverse time lag zero-sequence protection method |
| CN107863764A (en) * | 2017-11-14 | 2018-03-30 | 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 |
| 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 |
| CN110739669A (en) * | 2019-10-30 | 2020-01-31 | 三峡大学 | inverse time limit overcurrent protection method based on impedance correction |
| CN111769523A (en) * | 2020-06-19 | 2020-10-13 | 中国南方电网有限责任公司 | Double-circuit line inverse time limit zero sequence current protection setting method containing series compensation |
| CN111740379A (en) * | 2020-07-01 | 2020-10-02 | 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 |
| 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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| CN106655118B (en) | 2019-04-09 |
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