CN106899010A - A kind of zero-sequenceprotection method for considering disconnection fault - Google Patents
A kind of zero-sequenceprotection method for considering disconnection fault Download PDFInfo
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- CN106899010A CN106899010A CN201510962580.7A CN201510962580A CN106899010A CN 106899010 A CN106899010 A CN 106899010A CN 201510962580 A CN201510962580 A CN 201510962580A CN 106899010 A CN106899010 A CN 106899010A
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- zero
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- sequenceprotection
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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
- 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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—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 for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
Abstract
The present invention relates to a kind of zero-sequenceprotection method for considering disconnection fault, including：Judge circuit zero-sequence current whether more than excessively stream definite value；When circuit zero-sequence current is more than excessively stream definite value, assert that zero-sequenceprotection condition occurs；Judge whether line voltage distribution change is less than 0.04 times of rated voltage, when line voltage distribution rated voltage of the change less than 0.04 times, assert that zero-sequenceprotection condition occurs.Judge whether circuit both sides are respectively less than 0.04 times of circuit rated current with famous prime minister's no current, when circuit both sides are respectively less than 0.04 times of circuit rated current with famous prime minister's no current, assert that zero-sequenceprotection condition occurs；When above three zero-sequenceprotection condition occurs simultaneously, carry out protection act and jump three-phase.Technical solution of the present invention mutually passes circuit both sides total current using circuit split-phase longitudinal differential, judges whether protected circuit occurs open phase fault, it is ensured that disconnected phase line perfects circuit zero sequence back-up protection action and jumps three-phase prior to other, it is to avoid adjacent lines zero-sequenceprotection malfunction.
Description
Technical field
The present invention relates to the technical field of relay protection of power system, a kind of consideration broken string event is more particularly to
The zero-sequenceprotection method of barrier.
Background technology
Because power network is increasingly sophisticated, line transmission capacity increase, heavy service circuit increases.In view of laterally
The frequency of failure and the harm to system are far longer than open conductors, typically former to zero-sequenceprotection
Reason, fixed value adjusting mainly consider failure amount of the system after generation short circuits under the different methods of operation,
Consideration to the less open conductors of probability of happening is less.But found in actual moving process at present, generally
The less pure disconnection fault of rate is possible to cause the malfunction of adjacent lines zero-sequence current protection, particularly weighs
The wiring on the same tower circuit of load, the false protection after disconnection fault has the possibility of aggravation fault spread.
At present, general the adjusting of the zero sequence of ultra-high/extra-high voltage circuit most latter end protection definite value is 300A, specified time
Actuation time is not less than 3.5 seconds.It is general to overlap for the ultra-high/extra-high voltage circuit using single-pole reclosing
It is 1 second or so that the lock time adjusts mostly, less than the action of circuit zero sequence current timing limit protection final stage
Time, adjacent lines protection will not be impacted；And due to the single-phase jump of line-breaker or it is single-phase steal
The open conductors for closing and causing, generally protect (being commonly called as " non-whole phase protection ") by " position of the switch does not correspond to "
Solve, the not corresponding states of the Sustainable use breaker auxiliary contact as criterion, operation time limit again smaller than
The actuation time of circuit zero sequence current timing limit protection final stage.The relatively conventional circuit of above two is indulged
All related to line-breaker to failure, the criterion of protection is easier to obtain, and breaks for primary system
Or electrical secondary system broken string also can more clearly be distinguish between, and use what is " avoided " in time definite value
Mode prevents the adjacent circuit zero sequence current timing that perfects from limiting final stage malfunction.When open phase fault occurs online
When on road, relatively conventional is the wired earth at broken string, now due to occurring with earth fault,
Longitudinal differential protection system, standby ground distance or zero-sequenceprotection can cut off failure mostly, therefore typically will not
Influence is produced on adjacent lines.
It is worth noting that there are " pure " open conductors unrelated with breaker on transmission pressure.This kind of event
Barrier is likely to occur at the drainage thread of line tension tower, angle tower, or at two intervals of compact line
Between rod, in addition, line disconnecting switch voluntarily disconnects (come off), interior line-outgoing equipment lead of standing takes off
Fall etc. to being also possible to cause " pure " open conductors under special circumstances.Certainly, passed through according to long-term operation
Test, it is very rare that circuit occurs pure open conductors, but, once heavy-haul line is resolved
Phase and earth-free failure, in addition to this circuit necessarily has zero-sequence current, with the adjacent lines certainty of section
Also zero-sequence current, zero-sequence current and load current, the quantity of parallel line of adjacent lines can thus be produced
And system both sides zero sequence impedance is relevant.In view of setting principle noted earlier, and same voltage class
Circuit zero sequence current timing limit final stage generally takes the convention of adjusting of identical value, certainly will be sent out in heavy-haul line
The phenomenon that a plurality of circuit zero sequence back-up protection of same section is acted simultaneously is likely to occur during raw open conductors, such as
Fruit considers further that the influence that high-power transfer is brought, and consequence is beyond imagination.Therefore, searching one kind is needed badly to examine
Consider the zero-sequenceprotection new method of disconnection fault, it is ensured that the safe operation of ultra-high/extra-high voltage power network.
The content of the invention
It is an object of the invention to provide a kind of zero-sequenceprotection method for considering disconnection fault, using circuit split-phase
Longitudinal differential mutually passes circuit both sides total current, judges whether protected circuit occurs open phase fault, it is ensured that disconnected
Phase line perfects circuit zero sequence back-up protection action and jumps three-phase prior to other.
To achieve the above object, the present invention uses following technical scheme：A kind of zero sequence for considering disconnection fault
Guard method, including：
Judge circuit zero-sequence current whether more than excessively stream definite value；When circuit zero-sequence current is more than excessively stream definite value
When, assert that zero-sequenceprotection condition occurs；
Judge whether line voltage distribution change is less than 0.04 times of rated voltage, when line voltage distribution change is less than
0.04 times of rated voltage, assert that zero-sequenceprotection condition occurs.
Judge whether circuit both sides are respectively less than 0.04 times of circuit rated current with famous prime minister's no current, work as circuit
Both sides are respectively less than 0.04 times of circuit rated current with famous prime minister's no current, assert that zero-sequenceprotection condition occurs；
When above three zero-sequenceprotection condition occurs simultaneously, carry out protection act and jump three-phase.
The protection act time limit is by escaping reclosure time and breaker three phases un identical protection actuation time
The greater adjust, and the time limit is less than the time definite value of the last section of zero sequence.
Judge that the criterion whether circuit zero-sequence current is more than excessively stream definite value is：3I0>3I0set, wherein, I0For
Zero sequence excess current definite value, I0setIt is zero sequence excess current definite value；Zero sequence excessively stream definite value uses zero sequence excessively stream latter end
Definite value
Circuit both sides total current is mutually passed using circuit split-phase longitudinal differential, circuit both sides three-phase current is obtained,
I.e. this side and offside three-phase current, judge whether protected circuit occurs open phase fault.
With immediate prior art ratio, the present invention provides technical scheme has following excellent effect
1st, technical solution of the present invention ensure that ultra-high/extra-high voltage transmission line of electricity in the case of broken string prior to adjacent lines
The zero sequence back-up protection action excision three-phase on road, it is to avoid because disconnection fault causes the standby of adjacent lines zero sequence to be protected
Shield malfunction, and cause system safe and stable operation to aggravate the problem of destruction；
2nd, technical solution of the present invention using split-phase longitudinal differential mutually pass circuit both sides total current judge circuit break
Line, on the one hand judges to ensure that the reliability without stream criterion without stream simultaneously in both sides；Even if another aspect one
CT broken strings in side will not also cause to be acted without stream criterion, at utmost reduce the influence of CT broken strings；
3rd, technical solution of the present invention is particularly suited for circuit case of heavy load, zero sequence electricity when now due to disconnected phase
Stream size direct ratio and disconnected phase front line load electric current, load weight, then zero-sequence current is inevitable big during phase of breaking, and zero
The zero sequence back-up protection of sequence back-up protection, particularly adjacent lines is easier malfunction；And in the case of heavy load
False protection will cause more serious consequence；
4th, technical solution of the present invention cuts off disconnected phase line three-phase, it is to avoid cause adjacent lines zero sequence standby
False protection, has ensured the safe and stable operation of system；
5th, technical solution of the present invention Reliability of Microprocessor is high, and engineering adaptability is stronger, particularly with many feedbacks
Electric line has certain practical meaning in engineering.
Brief description of the drawings
Fig. 1 is the zero sequence back-up protection method logic chart of the consideration disconnection fault of the embodiment of the present invention；
Fig. 2 is the double back transmission line wiring schematic diagram of the embodiment of the present invention.
Specific embodiment
With reference to embodiment, the invention will be described in further detail.
Embodiment 1：
The invention of this example provides a kind of zero-sequenceprotection method for considering disconnection fault, including：
(1) judge circuit zero-sequence current whether more than excessively stream definite value, criterion：3I0>3I0set, herein zero
Sequence excessively stream definite value can use zero sequence excessively stream latter end definite value.
(2) judge that line voltage distribution change is little, criterion：ΔU<0.04Ue, UeIt is rated voltage.
(3) judge circuit both sides with famous prime minister's no current criterion：
It is this side of circuit and offside phase current, IeIt is circuit rated current.
As shown in Fig. 1 relay protective schemes, above three condition occurs simultaneously, just possesses protection act and jumps three-phase
Primary condition, operation time limit is by escaping reclosure time, breaker three phases un identical protection actuation time
Middle the greater is adjusted, and needs the time definite value less than the last section of zero sequence.
As shown in Figure 2, there is A phase disconnection faults in double back transmission line in L1 circuit B2 exits,
Zero-sequence current size is as shown in table 1 at each breaker, when it is 1 to convey power/natural power multiple,
Zero-sequence current is more than 300A at B3, B5, when it is 1.5 and 2 to convey power/natural power multiple,
Zero-sequence current is more than 300A at B2, B3, B4, B5, by foregoing setting principle, if not using this to send out
Bright method can cause the back-up protection of L1 and L2 circuit zero sequences to act so that both sides grid contact disconnects.
When considering the zero-sequenceprotection new method of disconnection fault using the present invention, analysis the protection implement process is as follows：
(1) the zero-sequence current size as shown in table 1, zero sequence excessively stream criterion：3I0>3I0set(zero sequence herein
Excessively stream definite value uses zero sequence excessively stream latter end definite value), L1, L2 lines part meet, and are judged to zero sequence excessively stream.
(2) line voltage distribution change criterion：ΔU<0.04Ue(UeIt is rated voltage) condition satisfaction, L1,
It is unchanged that L2 lines are judged to line voltage distribution.
(3) judge circuit both sides with famous prime minister's no current criterion：(IeIt is line
Road rated current) L1 line A phases condition satisfaction, L1 line A phases both sides are judged to without stream.
(4) L1 lines A phases meet above-mentioned 3 conditions, are judged to L1 line A phases and break.During due to action
Limit is by escaping reclosure time, the greater is adjusted in breaker three phases un identical protection actuation time, and
Less than the time definite value of the last section of zero sequence.Then disconnection fault exists after operation time limit arrival, L1
Line is acted in jump three-phase, it is to avoid the back-up protection of L2 line zero sequences is acted and isolates both sides grid contact.
Table 1
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention rather than to it
Limitation, those of ordinary skill in the art with reference to above-described embodiment although should be understood：Still can be right
Specific embodiment of the invention is modified or equivalent, and these are without departing from spirit of the invention and model
Any modification enclosed or equivalent, within claims of the invention.
Claims (4)
1. it is a kind of consider disconnection fault zero-sequenceprotection method, it is characterised in that：Including：
Judge circuit zero-sequence current whether more than excessively stream definite value；When circuit zero-sequence current is more than excessively stream definite value,
Assert that zero-sequenceprotection condition occurs；
Judge whether line voltage distribution change is less than 0.04 times of rated voltage, when line voltage distribution change is less than 0.04
Rated voltage again, assert that zero-sequenceprotection condition occurs；
Judge whether circuit both sides are respectively less than 0.04 times of circuit rated current with famous prime minister's no current, when circuit two
Side is respectively less than 0.04 times of circuit rated current with famous prime minister's no current, assert that zero-sequenceprotection condition occurs；
When above three zero-sequenceprotection condition occurs simultaneously, carry out protection act and jump three-phase.
2. a kind of zero-sequenceprotection method for considering disconnection fault as claimed in claim 1, it is characterised in that：
The protection act time limit is by the greater escaped in reclosure time and breaker three phases un identical protection actuation time
Adjust, and the time limit is less than the time definite value of the last section of zero sequence.
3. a kind of zero-sequenceprotection method for considering disconnection fault as claimed in claim 1 or 2, its feature exists
In：Judge that the criterion whether circuit zero-sequence current is more than excessively stream definite value is：3I0>3I0set, wherein, I0It is zero
Sequence overcurrent definite value, I0setIt is zero sequence excess current definite value；Zero sequence excessively stream definite value uses zero sequence excessively stream latter end definite value
4. a kind of zero-sequenceprotection method for considering disconnection fault as claimed in claim 1, it is characterised in that：
Circuit both sides total current is mutually passed using circuit split-phase longitudinal differential, circuit both sides three-phase current, i.e. this side is obtained
With offside three-phase current, judge whether protected circuit occurs open phase fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510962580.7A CN106899010B (en) | 2015-12-21 | 2015-12-21 | A kind of zero-sequenceprotection method considering disconnection fault |
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| CN201510962580.7A CN106899010B (en) | 2015-12-21 | 2015-12-21 | A kind of zero-sequenceprotection method considering disconnection fault |
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| CN106899010A true CN106899010A (en) | 2017-06-27 |
| CN106899010B CN106899010B (en) | 2019-04-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521116A (en) * | 2018-03-07 | 2018-09-11 | 中国电力科学研究院有限公司 | A kind of method and system for transmission line of electricity longitudinal direction failure to be identified |
| CN112072612A (en) * | 2020-08-18 | 2020-12-11 | 许继集团有限公司 | Zero-sequence overcurrent protection control method and device for resisting power frequency magnetic field interference |
| CN113541111A (en) * | 2021-07-09 | 2021-10-22 | 电子科技大学 | Power transmission line disconnection fault judgment method based on disconnection fault criterion |
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| US20040057178A1 (en) * | 2002-08-09 | 2004-03-25 | Kabushiki Kaisha Toshiba | Directional ground relay system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521116A (en) * | 2018-03-07 | 2018-09-11 | 中国电力科学研究院有限公司 | A kind of method and system for transmission line of electricity longitudinal direction failure to be identified |
| CN112072612A (en) * | 2020-08-18 | 2020-12-11 | 许继集团有限公司 | Zero-sequence overcurrent protection control method and device for resisting power frequency magnetic field interference |
| CN113541111A (en) * | 2021-07-09 | 2021-10-22 | 电子科技大学 | Power transmission line disconnection fault judgment method based on disconnection fault criterion |
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| CN106899010B (en) | 2019-04-05 |
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