CN103683233B - A kind of longitudinal protection method of automatic adaptation transmission line of electricity power inverted orientation - Google Patents
A kind of longitudinal protection method of automatic adaptation transmission line of electricity power inverted orientation Download PDFInfo
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- CN103683233B CN103683233B CN201310717326.1A CN201310717326A CN103683233B CN 103683233 B CN103683233 B CN 103683233B CN 201310717326 A CN201310717326 A CN 201310717326A CN 103683233 B CN103683233 B CN 103683233B
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Abstract
The present invention discloses the longitudinal protection method of a kind of automatic adaptation transmission line of electricity power inverted orientation, comprises the steps: to utilize the positive and negative direction recognition component of protection, and whether emergent power swings to situation to differentiate transmission line of electricity according to both forward and reverse directions element movement sequencing；Calculate external area error breaker open operation time and permissive type order pilot protection channel transfer time; when judging that transmission line of electricity emergent power is swung to; both of the aforesaid time-triggered protocol is formed additional delay, by pilot protection additional delay so that it is misoperation does not occur when power inverted orientation；When being judged to that non-power is swung to, pilot protection does not increase additional delay.Pilot protection incorrect operation when this kind of longitudinal protection method can avoid power inverted orientation.
Description
Technical field
The present invention relates to the transmission line of electricity power inverted orientation that automatically adapts to of relay protection in field of power and indulge UNPROFOR
Protect implementation method.
Background technology
Along with Network Construction of Power Transmission is increasingly sophisticated, parallel lines on same tower double back, feed back electrically at super-pressure, extra-high more
The most common application in line ball road.As it is shown in figure 1, II loop line breaks down near M side outlet, break in this circuit M side
The road device mute time may be early than N side breaker, and now non-fault line I loop line power transmission direction occurs
Change, forms power inverted orientation and can cause I loop line pilot protection incorrect operation.Increasing increasingly along with DC line
Many, in AC-DC hybrid power grid, the rapid action feature of DC control protection is also easy to shape on transmission line of alternation current
Success rate swings to phenomenon.
Traditional pilot protection adapts to power inverted orientation and mainly takes following method: take owing to when emergent power is swung to
Certainly in the opening velocity of adjacent line breaker, it is therefore assumed that from adjacent line fault to breaker open operation time difference more than fixing
Value TA, if pilot protection is not operating in the TA time period after the protection of this line starts, is accordingly to be regarded as this circuit and merit occurs
Rate swings to phenomenon, and hereafter pilot protection action needs to increase the constant time lag of TB, during to avoid power inverted orientation pair
Pilot protection signal transmission delay on passage in side causes pilot protection misoperation.
And along with the development of technology, in the quickening of breaker open operation speed, and AC/DC network, direct current quickly closes
Lock causes power direction rapid translating, and after adjacent line fault, this line will quickly be swung to by emergent power, thus cause TA
Time is chosen difficulty and strengthens, it is impossible to adapt to different system architectures；It addition, along with relay protecting private channel provides
Source the most in short supply, increasing pilot protection uses public network passage, public network channel transfer under special circumstances
Time is relatively long and the no standard upper limit, and the TB constant time lag that conventional pilot protection uses cannot adapt to difference
The channel transfer time.Due to above-mentioned 2 reasons, cause traditional pilot protection when power inverted orientation due to just
There is misoperation in directional element and locking (permission) signal sequence matching problem.
It is based on Such analysis, in order to solve the impact that transmission line of electricity power inverted orientation causes for pilot protection,
This case thus produces.
Summary of the invention
The purpose of the present invention, is to provide the longitudinal protection method of a kind of automatic adaptation transmission line of electricity power inverted orientation,
Pilot protection incorrect operation when it can avoid power inverted orientation.
In order to reach above-mentioned purpose, the solution of the present invention is:
The longitudinal protection method of a kind of automatic adaptation transmission line of electricity power inverted orientation, comprises the steps:
(1) utilize the positive and negative direction recognition component of protection, sentence according to both forward and reverse directions element movement sequencing
Whether emergent power swings to situation to other transmission line of electricity；
(2) external area error breaker open operation time and permissive type order pilot protection channel transfer time are calculated,
When judging that transmission line of electricity emergent power is swung to, both of the aforesaid time-triggered protocol is formed additional delay, by vertical
UNPROFOR protects additional delay so that it is misoperation does not occur when power inverted orientation；When being judged to that non-power is swung to, vertical
UNPROFOR is protected does not increases additional delay.
The concrete method of discrimination of above-mentioned steps (1) is: according to protection positive and negative direction recognition component action situation,
If presenting the action of opposite direction recognition component elder generation, the feature of action after positive direction recognition component, it is believed that this transmission line of electricity
Emergent power swings to situation.
In above-mentioned steps (2), it is allowed to the calculation of formula order pilot protection channel transfer time T_TRANS
It is: calculate protection opposite direction recognition component action in real time and passage receives the time difference allowing signal.
In above-mentioned steps (2), the external area error breaker open operation time computational methods of T_REV are: count in real time
Calculate the protection opposite direction recognition component action of this side and the time difference of return.
The detailed content of above-mentioned steps (2) is: identify when circuit emergent power is swung to, for permissive type order
Pilot protection, by the channel transfer time T_TRANS calculated in real time and external area error breaker open operation time
T_REV, both compare to get the small value and are assigned to the additional delay T_add of pilot protection, when pilot protection operation condition
After Man Zuing, through the just action of T_add additional delay pilot protection；For enclosed type order pilot protection, take
T_add=T_REV, after pilot protection operation condition meets, through the just action of T_add additional delay pilot protection.
Use after such scheme, the present invention utilize protection to start after opposite direction element prior to positive direction element movement
Feature, identifies that transmission line of electricity emergent power is swung to, and protects the directional element formed according to input voltage and input current amount to know
Other power inverted orientation situation, pilot protection incorrect operation when avoiding power inverted orientation by increasing additional delay, this
Bright adapt to alternating current-direct current series-parallel connection power transmission network, breaker open operation at a high speed and the feelings of various channel transfer time
Condition.
Accompanying drawing explanation
Fig. 1 is double back transmission line schematic diagram；
Fig. 2 is identification power inverted orientation state logic figure of the present invention；
Wherein,
A represents output 1 when opposite direction recognition component meets, and otherwise exports 0；
B represents output 1 when positive direction recognition component meets, and otherwise exports 0；
C represents " start-up study " logic, when input is become 1 by 0, exports 1 through time delay t1, works as input
Be 0 constant or from 1 become 0 time, without time delay directly allow output equal to input；
D represents " return time delay " logic, when input is become 0 by 1, exports 0 through time delay t2, works as input
Be 1 constant or from 0 become 1 time, without time delay directly allow output equal to input；
E represents that AND gate operates；
F represents that " power inverted orientation state " identifies output.
Detailed description of the invention
Below with reference to accompanying drawing, technical scheme is described in detail.
As it is shown in figure 1, be the double back transmission line schematic diagram applied of the present invention, wherein, protection is installed on I
Loop line both sides.When II loop line M side outlet breaks down, II loop line M side breaker BRK3 divides prior to N side
Lock.After II loop line M side breaker BRK3 separates, I loop line will appear from power inverted orientation situation.
The present invention provides the longitudinal protection method of a kind of automatic adaptation transmission line of electricity power inverted orientation, including walking as follows
Rapid:
(1) the positive and negative direction recognition component utilizing protection (includes the direction units such as distance, zero sequence, variable quantity
Part) action sequencing differentiate the transmission line of electricity situation whether emergent power is swung to；
Shown in Fig. 1, when II loop line breaks down near M side, the opposite direction identification of I loop line M side protection
Element is by action；After II loop line M side breaker BRK3 separating brake causes I loop line emergent power to swing to, I time
The positive direction recognition component of line M side protection is by action.After the present invention utilizes protection to start just, opposite direction identification is first
Part, prior to the feature of positive direction recognition component action, identifies that transmission line of electricity occurs in that power inverted orientation.
(2) external area error breaker open operation time and permissive type order pilot protection channel transfer time are calculated,
When judging that transmission line of electricity emergent power is swung to, both of the aforesaid time-triggered protocol is formed additional delay, by vertical
UNPROFOR protects additional delay so that it is misoperation does not occur when power inverted orientation；When being judged to that non-power is swung to, vertical
UNPROFOR is protected does not increases additional delay.
Specifically, cancel constant time lag TB that tradition pilot protection increases for power inverted orientation, calculate in real time
Breaker open operation time and channel transfer time form additional delay T_add, and this additional delay is in the following way
Calculate:
After protection starts, opposite direction recognition component action starts timing, and opposite direction recognition component returns and stops timing.
This timing length T_REV can reflect that adjacent line occurs to breaker open operation duration from fault；
When pilot protection uses permissive type order: after protection starts, opposite direction recognition component action starts timing,
Timing is stopped when receiving when offside pilot protection allows signal.This timing length T_TRANS can reflect that permissive type is ordered
Make pilot protection channel transfer time delay.
According to above-mentioned real-time calculated time, join protection power inverted orientation identification situation, form pilot protection
Additional delay T_add, specific as follows.
For permissive type order pilot protection:
When being determined as power inverted orientation, take T_REV and T_TRANS smaller value attached as pilot protection action
Add time delay T_add；
When being determined as non-power and swinging to, pilot protection action additional delay T_add is set to 0.
For enclosed type order pilot protection:
When being determined as power inverted orientation, take T_REV as pilot protection action additional delay T_add；
When being determined as non-power and swinging to, pilot protection action additional delay T_add is set to 0.
During transmission line of electricity generation power inverted orientation, protection identifies this situation according to both forward and reverse directions element movement order,
Increase additional delay T_add, it is to avoid pilot protection misoperation；During the internal fault of transmission line of electricity generating region, unidentified
For power inverted orientation, protect and excise fault without additional delay action.
In conjunction with Fig. 2, when II loop line breaks down, I loop line M side opposite direction recognition component action；When II time
After line M side breaker BRK3 separates, I loop line M side positive direction discriminating element action, present opposite direction identification
The action of element elder generation, action after positive direction recognition component, meet power inverted orientation feature, be power through this logic discrimination
Swing to.
Protection calculates pilot protection simultaneously and adapts to the additional delay T_add of power inverted orientation after starting, be identified as merit
In the case of rate is swung to, calculate as follows.
If pilot protection employing permissive type order:
After I loop line protection starts, opposite direction recognition component action starts timing, and opposite direction recognition component returns and then stops
Only timing, is designated as T_REV by this timing result；
After I loop line protection starts, opposite direction recognition component action starts timing, allows when receiving offside pilot protection
Timing is stopped during signal.This timing result is designated as T_TRANS；
T_add=min(T_REV,T_TRANS)
If pilot protection employing enclosed type order:
After I loop line protection starts, opposite direction recognition component action starts timing, and opposite direction recognition component returns and then stops
Only timing, is designated as T_REV by this timing result.
T_add=T_REV
When being identified as in the case of non-power swings to, for permissive type and blocking mode pilot protection, additional prolong
Shi Jun is taken as zero, it may be assumed that
T_add=0
After pilot protection operation condition meets (positive direction meets and receives permission signal), add through T_add
The just action outlet of time delay pilot protection.
Utilize both forward and reverse directions recognition component action sequencing, identify power inverted orientation；Automatically additional delay is calculated,
Pilot protection action is increased corresponding time delay, it is to avoid misoperation occurs in the case of power inverted orientation.
Above example is only the technological thought that the present invention is described, it is impossible to limit protection scope of the present invention with this,
Every technological thought proposed according to the present invention, any change done on the basis of technical scheme, each fall within this
Within invention protection domain.
Claims (2)
1. the longitudinal protection method of an automatic adaptation transmission line of electricity power inverted orientation, it is characterised in that include as follows
Step:
(1) the positive and negative direction recognition component of protection is utilized, according to positive and negative direction recognition component action successively
Order differentiates transmission line of electricity, and whether emergent power swings to situation；
(2) external area error breaker open operation time and permissive type order pilot protection channel transfer time are calculated,
When judging that transmission line of electricity emergent power is swung to, both of the aforesaid time-triggered protocol is formed additional delay, by vertical
UNPROFOR protects additional delay so that it is misoperation does not occur when power inverted orientation；When being judged to that non-power is swung to, vertical
UNPROFOR is protected does not increases additional delay；
The detailed content of described step (2) is: identify when circuit emergent power is swung to, for permissive type order
Pilot protection, by the channel transfer time T_TRANS calculated in real time and external area error breaker open operation time
T_REV, both compare to get the small value and are assigned to the additional delay T_add of pilot protection, when pilot protection operation condition
After Man Zuing, through the just action of T_add additional delay pilot protection；For enclosed type order pilot protection, take
T_add=T_REV, after pilot protection operation condition meets, through the just action of T_add additional delay pilot protection.
The longitudinal protection method of a kind of automatic adaptation transmission line of electricity power inverted orientation the most as claimed in claim 1,
It is characterized in that: in described step (2), calculate protection opposite direction recognition component action in real time and passage receives
Allow the time difference T_TRANS of signal, this time difference reflection permissive type order pilot protection one direction channel transfer
Time.
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| CN201310717326.1A CN103683233B (en) | 2013-12-24 | 2013-12-24 | A kind of longitudinal protection method of automatic adaptation transmission line of electricity power inverted orientation |
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| CN201310717326.1A CN103683233B (en) | 2013-12-24 | 2013-12-24 | A kind of longitudinal protection method of automatic adaptation transmission line of electricity power inverted orientation |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104362600B (en) * | 2014-10-31 | 2018-03-02 | 国家电网公司 | A kind of transmission line of alternation current cell protection integrated configuration method based on new energy |
| CN105006809A (en) * | 2015-08-07 | 2015-10-28 | 南京南瑞继保电气有限公司 | Power converse determination method of longitudinal protection of double-circuit line of intelligent transformer station |
| CN107732882B (en) * | 2017-11-22 | 2019-06-11 | 广东电网有限责任公司电力调度控制中心 | A kind of hvdc transmission line direction pilot protection method |
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| CN101534004A (en) * | 2008-03-10 | 2009-09-16 | 王锐 | Method for distinguishing failure and tripping of high-voltage short-distance double-circuit chain-type power network |
| CN101820185A (en) * | 2009-02-26 | 2010-09-01 | 西北电网有限公司 | Power grid fault judgment method based on IEC61850 signal semantic logic |
| CN102427223A (en) * | 2011-10-21 | 2012-04-25 | 浙江省电力公司 | Method for judging lock by zero sequence voltage and current |
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