CN106981861A - A kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method - Google Patents
A kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method Download PDFInfo
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- CN106981861A CN106981861A CN201610035041.3A CN201610035041A CN106981861A CN 106981861 A CN106981861 A CN 106981861A CN 201610035041 A CN201610035041 A CN 201610035041A CN 106981861 A CN106981861 A CN 106981861A
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- sequence
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Classifications
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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
-
- 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
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
Abstract
The present invention relates to a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method, including：Build zero sequence criterion, including the main criterion of zero sequence direction and zero-sequence current start-up criterion；Build negative phase-sequence criterion, including negative sequence direction assistant criteria, negative sequence compensation voltage starting criterion, negative-sequence current start-up criterion and negative sequence voltage threshold；If zero sequence criterion is met with negative phase-sequence criterion simultaneously, positive failure is judged to；If zero sequence criterion is met, while negative-sequence current start-up criterion is unsatisfactory for, and negative sequence voltage threshold is met, and is now considered weak mains outlet internal fault, is equally judged to positive failure；It is that earth fault, protection exit tripping operation occur for line-internal if circuit two ends are judged to positive failure.Technical solution of the present invention can effectively prevent from perfecting during multiple-circuit on same tower open conductors the generation of circuit zero sequence pilot protection malfunction problem by introducing negative sequence component and the improvement to offset voltage.
Description
Technical field
The present invention relates to field of relay protection in power, a kind of multiple-circuit on same tower open conductors zero sequence is more particularly to
Pilot protection faulty action preventing method.
Background technology
Circuit zero sequence pilot protection as the single-phase main protection through transition resistance eutral grounding failure of circuit, because its principle is simple,
The advantages of fault distinguishing sensitivity is high is used widely.At the same time, when zero sequence pilot protection is configured at multiple-circuit on same tower
When, it is electrically coupled and magnetic-coupled double action due to existing so that direct shadow of the zero sequence pilot protection by system operation mode
Ring, reliability is on the hazard.For the problem, the actions for focusing on zero-sequenceprotection during circuit short circuits special more in previous literature
Property and corrective measure, have obtained many beneficial achievements.
However, by recent studies have found that, for the zero sequence pilot protection logic configured at present, when multiple-circuit on same tower one
When postbacking raw open conductors (broken string), perfect circuit and there is malfunction possibility for another time, this phenomenon has caused for several times that scene is by mistake
The generation of dynamic event, and obtained experimental verification.
To find out its cause, after common-tower double-return line one postbacks raw disconnection fault, polarity phase can be presented in circuit two ends residual voltage
Anti- state.Now under the effect that is electrically coupled, one residual voltage zero crossing of formation on circuit can be perfected adjacent.In magnetic coupling
Under effect, perfecting line two ends residual voltage difference can decline, and the zero-sequence current passed through can rise.Now, if still using existing
Zero sequence pilot protection logic (typical logic to meet after voltage compensation condition, by 2/3Z0Compensate, Z0Hindered for all fronts zero sequence
Anti- value), then can occur because residual voltage overcompensation and caused by perfect line two ends zero-sequence direction component and meanwhile be judged to forward direction situation,
So as to cause false protection.The application proposes solution to this problem.
The content of the invention
It is an object of the invention to provide a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method, pass through
Negative sequence component and the improvement to offset voltage are introduced, can effectively prevent from perfecting line zero during multiple-circuit on same tower open conductors
The generation of sequence pilot protection malfunction problem.
To achieve the above object, the present invention uses following technical scheme：A kind of multiple-circuit on same tower open conductors zero sequence is indulged
UNPROFOR protects faulty action preventing method, including：
Build zero sequence criterion, including the main criterion of zero sequence direction and zero-sequence current start-up criterion；
Negative phase-sequence criterion is built, including the startup of negative sequence direction assistant criteria, negative sequence compensation voltage starting criterion, negative-sequence current is sentenced
According to negative sequence voltage threshold；
If zero sequence criterion is met with negative phase-sequence criterion simultaneously, positive failure is judged to；
If zero sequence criterion is met, while negative-sequence current start-up criterion is unsatisfactory for, and negative sequence voltage threshold is met, and is now recognized
To be weak mains outlet internal fault, positive failure is equally judged to；
It is that earth fault, protection exit tripping operation occur for line-internal if circuit two ends are judged to positive failure.
The output of the zero sequence criterion is connected with first with door；By the output of the zero sequence criterion and negative phase-sequence criterion
It is connected with second with door；By described first output, the output of negative-sequence current start-up criterion and the negative sequence voltage door with door
The output of sill is connected with the 3rd with door；Second is connected with the output of door with the 3rd with the output of door with OR gate；
By the final output of the output of OR gate and the open conductors zero sequence pilot protection criterion of the circuit other end by being connected with door.
The main criterion of zero sequence direction is：
In formula,WithRespectively the residual voltage and electric current of installation place are protected in circuit one end, and its positive direction is using ginseng
Examine direction, Z0For circuit zero sequence impedance.
The zero-sequence current start-up criterion is：
The formula is the electric current threshold value that zero sequence direction starts, wherein,The residual voltage of installation place is protected for circuit one end
And electric current.
The negative sequence direction assistant criteria is：
In formula,WithRespectively the negative sequence voltage and electric current of installation place are protected in circuit one end, and its positive direction is using ginseng
Examine direction, Z2For circuit negative sequence impedance.
The negative sequence compensation voltage starting criterion is：
The formula is the offset voltage threshold value that negative sequence direction starts, equivalent to by 1/3Z2The negative sequence voltage amplitude of compensation,；
Wherein, UNFor power network rated voltage.
The negative-sequence current start-up criterion is：
The formula is the electric current threshold value that negative sequence direction starts,The negative-sequence current of installation place is protected for circuit one end.
The negative sequence voltage threshold is：
The formula is the negative sequence voltage threshold value for recognizing weak mains, UNFor power network rated voltage,Protect and pacify for circuit one end
Negative sequence voltage at dress.
If the main criterion of zero sequence direction and negative sequence direction assistant criteria are unsatisfactory for, and zero-sequence current start-up criterion, negative phase-sequence
Offset voltage start-up criterion and negative-sequence current start-up criterion are satisfied by, then are judged to reverse fault；Other situations, are fault-free.
With immediate prior art ratio, the present invention, which provides technical scheme, has following excellent effect
1st, technical solution of the present invention reduces the generation of live malfunction event；
2nd, the problem of technical solution of the present invention more effectively solves the resistance eutral grounding failure through transition single-phase to circuit；
3rd, technical solution of the present invention improves route protection reliability.
Brief description of the drawings
Fig. 1 is the zero sequence pilot protection faulty action preventing logic chart of the embodiment of the present invention；
Fig. 2 is the analogue system figure of the embodiment of the present invention；
Fig. 3 is the tower structure schematic diagram of the embodiment of the present invention；
Fig. 4 is the generation A phase disconnection fault schematic diagrames of the embodiment of the present invention；
Fig. 5 is the generation A phase disconnection fault schematic diagrames of the embodiment of the present invention；
Fig. 6 is the generation A phase short trouble schematic diagrames of the embodiment of the present invention；
Fig. 7 is the generation A phase short trouble schematic diagrames of the embodiment of the present invention.
Embodiment
With reference to embodiment, the invention will be described in further detail.
Embodiment 1：
The invention of this example provides a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method, performs flow
As shown in Figure 2；When line failure, circuit one end protection device starts, collection three-phase voltage, current information, by meter
Calculate and form zero, negative sequence voltage, electric current U0、I0、U2、I2.Then, zero sequence criterion is performed：
U in formula0、I0The residual voltage electric current of installation place is protected for circuit one end, its positive direction uses reference direction, Z0
For circuit zero sequence impedance.Formula (1) with than width form present, its with by 1/3Z0The residual voltage of compensation and circuit zero-sequence current structure
Into ratio phase formula criterion it is of equal value：
2/3Z is generally pressed in traditional zero-sequenceprotection0Compensating impedance is adjusted in residual voltage compensation, the present invention
It is whole, it is reduced to 1/3Z0, can effectively reduce another loop line residual voltage overcompensation during time open conductors of common-tower double-return line
Probability.
The formula is the electric current threshold value that zero sequence direction starts, the validity of the zero sequence measured value for ensureing to participate in calculating.
Meanwhile, perform negative phase-sequence criterion：
U in formula2、I2The negative sequence voltage electric current of installation place is protected for circuit one end, its positive direction uses reference direction, Z2
For circuit negative sequence impedance.Similarly, the formula is with pressing 1/3Z2The ratio phase formula criterion that the negative sequence voltage and circuit negative-sequence current of compensation are constituted
It is of equal value：
The addition of negative sequence direction, is in order to prevent zero sequence direction from being judged by accident because of mutual inductance, by 1/3Z2Compensation, it is ensured that
Under disconnection fault, it is not in overcompensation to perfect circuit two ends zero-sequence direction component at least one end, can be judged to reversely, keep away
Exempt from protection misoperation.
The formula is the offset voltage threshold value that negative sequence direction starts, equivalent to by 1/3Z2The negative sequence voltage amplitude of compensation, with
Ensure the validity of criterion (3).
The formula is the electric current threshold value that negative sequence direction starts, identical with the setting meaning of zero-sequence current threshold.
The formula is the negative sequence voltage threshold value for recognizing weak mains, if light current source is unsatisfactory for electric current during line-internal failure
Criterion (5), then will certainly meet voltage criterion (6), and the influence that logic overcomes weak mains to bring can be set based on the principle.
Obtain after each criterion result of calculation, if criterion (1), (2), (3), (4), (5) are met simultaneously, or criterion (1),
(2), (6) are met, and criterion (5) is unsatisfactory for, then zero-sequence direction component is judged to positive direction；If criterion (1), (3) are unsatisfactory for, sentence
It is satisfied by according to (2), (4), (5), then zero-sequence direction component is judged to reverse fault；Other situation zero-sequence direction components are judged to without reason
Barrier.If being judged to positive direction, by taking permissive type pilot protection as an example, then permission signal is sent to opposite end, opposite end zero-sequence direction component is such as
Fruit is connected to signal, while itself being equally judged as forward direction, then protection exit trips, isolated fault circuit.Otherwise, zero sequence indulges UNPROFOR
Shield is failure to actuate.
By taking the double loop analogue system shown in Fig. 3 as an example, simulating, verifying is carried out to new criterion proposed by the invention.This
In system, It is double
The line parameter circuit value of loop line is represented with shaft tower parameter, as shown in figure 4, trouble point is set in Wai He areas of area, fault type bag
Single-phase short trouble and disconnection fault is included, in the case, faulty line and non-fault line two ends zero sequence side are calculated respectively
To element movement situation.The result of the action " 1 " represents positive failure, and the result of the action " -1 " represents reverse fault, the result of the action " 0 " table
Show and be failure to actuate.
(1) when occurring A phase disconnection faults, protection operation result is as shown in Figure 5；In the case, relay is shown as
Reverse fault, relay is shown as positive failure.At the same time the both sides relay for perfecting circuit is illustrated as fault-free, and this is
Because criterion (4) is not satisfied.Improved zero sequence pilot protection is failure to actuate on double loop in this example, with good reliable
Property.
(2) Fig. 6 is shown when occurring A phase disconnection faults, the operation result of protection.Now faulty line two ends zero sequence side
It is forward direction to element, rather than fault wire two ends zero-sequence direction component is failure to actuate.Found simultaneously by emulating, if perfecting line
Road uses traditional zero sequence pilot protection, then malfunction will occur in the example.It is improved in the present invention as can be seen here
Logic significantly improves protection reliability.
(3) Fig. 7 is shown when occurring A phase short troubles, the result of the action of common-tower double-return line protection.M ends as seen from the figure
Two relays be illustrated as reverse fault, and two relays of N-terminal are illustrated as positive failure.Therefore zero sequence direction is indulged
UNPROFOR shield can remain stationary as work during external short circuit.
(4) Fig. 7 shows the double loop protection act result when occurring A phase short troubles.Now faulty line two ends
Relay is illustrated as positive failure, protects correct operation.And for perfecting circuit, due to belonging to circuit I midpoint, and circuit
The parameter and electrical quantity of II both sides are symmetrical, therefore it is 0 to flow through the zero negative sequence electric current of circuit II, and protection is failure to actuate.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field with reference to above-described embodiment although should be understood：Still can be to embodiment of the invention
Modify or equivalent substitution, these any modifications or equivalent substitution without departing from spirit and scope of the invention, in Shen
Within claims of the invention that please be pending.
Claims (9)
1. a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method, it is characterised in that：Including：
Build zero sequence criterion, including the main criterion of zero sequence direction and zero-sequence current start-up criterion；
Build negative phase-sequence criterion, including negative sequence direction assistant criteria, negative sequence compensation voltage starting criterion, negative-sequence current start-up criterion and
Negative sequence voltage threshold；
If zero sequence criterion is met with negative phase-sequence criterion simultaneously, positive failure is judged to；
If zero sequence criterion is met, while negative-sequence current start-up criterion is unsatisfactory for, and negative sequence voltage threshold is met,
Now it is considered weak mains outlet internal fault, is equally judged to positive failure；
It is that earth fault, protection exit tripping operation occur for line-internal if circuit two ends are judged to positive failure.
2. a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method as claimed in claim 1, its feature
It is：The output of the zero sequence criterion is connected with first with door；The output of the zero sequence criterion and negative phase-sequence criterion is equal
It is connected with second with door；By described first output, the output of negative-sequence current start-up criterion and negative sequence voltage threshold with door
Output be connected with the 3rd with door；Second is connected with the output of door with the 3rd with the output of door with OR gate；Will
The final output of the output of OR gate and the open conductors zero sequence pilot protection criterion of the circuit other end with door by being connected.
3. a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method as claimed in claim 1 or 2, it is special
Levy and be：The main criterion of zero sequence direction is：
In formula,WithRespectively the residual voltage and electric current of installation place are protected in circuit one end, and its positive direction uses reference side
To Z0For circuit zero sequence impedance.
4. a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method as claimed in claim 1 or 2, it is special
Levy and be：The zero-sequence current start-up criterion is：
The formula is the electric current threshold value that zero sequence direction starts, wherein,The residual voltage and electricity of installation place are protected for circuit one end
Stream.
5. a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method as claimed in claim 1 or 2, it is special
Levy and be：The negative sequence direction assistant criteria is：
In formula,WithRespectively the negative sequence voltage and electric current of installation place are protected in circuit one end, and its positive direction uses reference side
To Z2For circuit negative sequence impedance.
6. a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method as claimed in claim 5, its feature
It is：The negative sequence compensation voltage starting criterion is：
The formula is the offset voltage threshold value that negative sequence direction starts, equivalent to by 1/3Z2The negative sequence voltage amplitude of compensation；Wherein, UN
For power network rated voltage.
7. a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method as claimed in claim 1 or 2, it is special
Levy and be：The negative-sequence current start-up criterion is：
The formula is the electric current threshold value that negative sequence direction starts,The negative-sequence current of installation place is protected for circuit one end.
8. a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method as claimed in claim 1 or 2, it is special
Levy and be：The negative sequence voltage threshold is：
The formula is the negative sequence voltage threshold value for recognizing weak mains, UNFor power network rated voltage,Installation place is protected for circuit one end
Negative sequence voltage.
9. a kind of multiple-circuit on same tower open conductors zero sequence pilot protection faulty action preventing method as claimed in claim 1, its feature
It is：If the main criterion of zero sequence direction and negative sequence direction assistant criteria are unsatisfactory for, and zero-sequence current start-up criterion, negative sequence compensation
Voltage starting criterion and negative-sequence current start-up criterion are satisfied by, then are judged to reverse fault；Other situations, are fault-free.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610035041.3A CN106981861B (en) | 2016-01-19 | 2016-01-19 | Method for preventing misoperation in longitudinal fault zero-sequence longitudinal protection of double-circuit lines on same tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610035041.3A CN106981861B (en) | 2016-01-19 | 2016-01-19 | Method for preventing misoperation in longitudinal fault zero-sequence longitudinal protection of double-circuit lines on same tower |
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| CN106981861B CN106981861B (en) | 2020-01-17 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991583A (en) * | 2017-12-29 | 2018-05-04 | 南京南瑞继保电气有限公司 | Flexible direct-current transmission system converter station exchanges outlet fault distinguishing method and system |
| CN108711853A (en) * | 2018-06-28 | 2018-10-26 | 国网山东省电力公司泰安供电公司 | City network analysis method, device and realization device |
| CN109301799A (en) * | 2018-10-12 | 2019-02-01 | 中国电力科学研究院有限公司 | A kind of method and system preventing multiple-loop line line pilot zero sequence direction relay malfunction |
| CN111025080A (en) * | 2019-10-12 | 2020-04-17 | 中国电力科学研究院有限公司 | Method and system for determining fault line based on station domain information |
| CN112485718A (en) * | 2020-12-11 | 2021-03-12 | 深圳供电局有限公司 | Method and device for judging short circuit fault direction of outgoing line of photovoltaic power station |
| CN113589195A (en) * | 2021-07-30 | 2021-11-02 | 国家电网有限公司 | Maloperation prevention method for PT secondary circuit two-point grounding zero sequence direction protection |
| CN113659546A (en) * | 2021-08-19 | 2021-11-16 | 国网湖南省电力有限公司 | Zero sequence direction element compensation method and system for double-circuit line power supply system |
| CN113970686A (en) * | 2021-10-27 | 2022-01-25 | 西南交通大学 | Power distribution network fault detection method and system based on single-ended quantity protection and positioning method |
| CN113970685A (en) * | 2021-10-27 | 2022-01-25 | 西南交通大学 | Power distribution network fault detection method and system based on differential analysis and positioning method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107991583A (en) * | 2017-12-29 | 2018-05-04 | 南京南瑞继保电气有限公司 | Flexible direct-current transmission system converter station exchanges outlet fault distinguishing method and system |
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| CN112485718A (en) * | 2020-12-11 | 2021-03-12 | 深圳供电局有限公司 | Method and device for judging short circuit fault direction of outgoing line of photovoltaic power station |
| CN112485718B (en) * | 2020-12-11 | 2023-02-03 | 深圳供电局有限公司 | Method and device for judging short circuit fault direction of output line of photovoltaic power station |
| CN113589195A (en) * | 2021-07-30 | 2021-11-02 | 国家电网有限公司 | Maloperation prevention method for PT secondary circuit two-point grounding zero sequence direction protection |
| CN113659546A (en) * | 2021-08-19 | 2021-11-16 | 国网湖南省电力有限公司 | Zero sequence direction element compensation method and system for double-circuit line power supply system |
| CN113659546B (en) * | 2021-08-19 | 2023-08-08 | 国网湖南省电力有限公司 | Zero sequence direction element compensation method and system for double-circuit line power supply system |
| CN113970686A (en) * | 2021-10-27 | 2022-01-25 | 西南交通大学 | Power distribution network fault detection method and system based on single-ended quantity protection and positioning method |
| CN113970685A (en) * | 2021-10-27 | 2022-01-25 | 西南交通大学 | Power distribution network fault detection method and system based on differential analysis and positioning method |
| CN113970686B (en) * | 2021-10-27 | 2022-08-30 | 西南交通大学 | Power distribution network fault detection method and system based on single-ended quantity protection and positioning method |
| CN113970685B (en) * | 2021-10-27 | 2022-08-30 | 西南交通大学 | Power distribution network fault detection method and system based on differential analysis and positioning method |
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