CN105762772B - A kind of method for identifying bus differential region - Google Patents
A kind of method for identifying bus differential region Download PDFInfo
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- CN105762772B CN105762772B CN201610289117.5A CN201610289117A CN105762772B CN 105762772 B CN105762772 B CN 105762772B CN 201610289117 A CN201610289117 A CN 201610289117A CN 105762772 B CN105762772 B CN 105762772B
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- busbar
- mother
- current transformer
- difference
- stream
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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
- H02H7/22—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
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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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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of method for identifying bus differential region; the current transformer of mother/section switch both sides is all accessed into busbar protective device; when the current transformer of both sides is without exception, the electric current of the small difference difference stream cross-reference current transformer of busbar protective device；When the current transformer of wherein side breaks and when two sections of mother/section switch connection busbares are in paired running; the current transformer of broken string is switched to using normal another current transformer; so that the small poor differential current computing of busbar protective device is still correct; if failure still has; interconnected again by short delay busbar; only differentiated at this time by big poor stream and jump all intervals of busbar, cut off failure completely.So as to which busbar protective device is when one group of mother mutual inductor breaks, betiding busbar troubles inside the sample space still has alternative.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field, and in particular to a kind of busbar paired running and generation mother
During connection/segmented current transformer disconnection, by another group of mother mutual inductor switching identification bus differential region, if failure is still deposited
In the complete spaced method of jump busbar institute of delay busbar interconnection.
Background technology
In double-bus (including double female single segmentations, double female double segmentations) and single mother partition (including single segmentation of mother three, single more points of mother
Section) in the main electrical scheme method of operation, the big poor stream of bus protection refers to other all busbar branches in addition to mother (segmentation) electric current
The vector sum electric current of electric current, the small poor stream of difference, which refers to, includes all of this section of busbar including mother (segmentation) electric current on one section of busbar
The vector sum electric current on road.Functionally, the big difference difference stream of busbar is used to differentiate in busbar area and external area error, small difference difference stream are used
In selection fault bus.
Existing many substations, primary side are mounted with two groups of Current Mutual Inductances in same mother (segmentation) breaker both sides
Device, but State Grid Corporation of China, Southern Power Grid Company related specifications only access one group of mother (segmentation) breaker to busbar and protect at present
Protection unit, when mother (segmentation) breaker breaks, though do not influence the calculating of big spill current, due to mother (segmentation) electric current without
Method obtains, therefore can not calculate small difference difference stream, causes two sections of busbares of the breaker to be in interconnection state.This phenomenon will not shadow
Differentiation of the bus protection to internal fault external fault is rung, but loses the selectivity to fault bus.At this time, when the either segment of interconnection
When troubles inside the sample space occurs for busbar, non-selectivity tripping, caused consequence are by all interval breakers being hung on two sections of busbares
Expand power failure range.
The content of the invention
During to solve mother/breaker broken string, the problem of differentiating to the selectivity of fault bus is lost, the present invention proposes
A kind of method for identifying bus differential region, it is in busbar paired running and wherein the one of mother/section switch both sides occurs
During a current transformer circuit supervision fail, by the current transformer switching identification bus differential region of opposite side, if failure still suffers from, prolong
When busbar interconnection is complete jumps the spaced method of busbar institute so that in mother/section switch broken string, remain to effectively select failure
Busbar, reduces power failure range, improves electricity consumption reliability.
Realize above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions：
A kind of method for identifying bus differential region, comprises the following steps：
S1：The current transformer for the mother/section switch both sides for connecting busbar I and busbar II is all accessed into bus protection
Device；
S2：Judge whether busbar I and busbar II is in the parallel method of operation；
S3：When busbar I and busbar II is in the parallel method of operation, the generation position of failure judgement, performs different behaviour
Make：
(1) when failure occurs outside bus-bar area, then busbar protective device does not start busbar I and/or the busbar of busbar II is poor
Dynamic protection act；
(2) when failure occurs on busbar or in dead band, judging the current transformer of mother/section switch both sides is
No broken string, busbar protective device perform following operation：
A is operated：When the current transformer of both sides does not break, the crossover current of mother/section switch is included in small
Poor difference stream, busbar protective device calculate the female small difference difference streams of I, the female small difference difference streams of II and big poor stream respectively, and start busbar I with/
Or the bus differential protecting action of busbar II；
B is operated：When the wherein current transformer circuit supervision fail of side, when failure occurs on busbar, busbar protective device exists
When calculating small difference difference stream, the female small difference difference streams of I and the female small difference difference streams of II use the Current calculation of normal current transformer, and open
The bus differential protecting action of dynamic busbar I or busbar II；When failure occurs in dead band, starting the mother of busbar I or busbar II
After the action of line differential protection, failure still suffers from, then is interconnected by short delay busbar, mutual by big poor differential current computing, excision
All intervals in busbar both ends of connection, cut off failure completely.
The step S3 A operation in, when the current transformer of both sides does not break, busbar protective device it is small poor
Flow the current transformer of cross-reference mother/section switch both sides；Each current transformer on the female small poor stream=I busbares of difference of I
Current value+mother/section switch side remote I mothers current transformer current value；The female small poor stream=II of difference of II are female
The current value of the current transformer of the remote II mothers of current value+mother/section switch side of each current transformer on line；
Each Current Mutual Inductance on big poor stream=busbar I and busbar II in addition to the current transformer of mother/section switch both sides
The sum of current value of device.
In A and the B operation of the step S3, the entry condition of mother's I bus differential protecting action is：It is poor greatly to have difference stream and I
Female small difference has poor stream；The entry condition of mother's II bus differential protecting action is：Big poor have that difference flows and the female small differences of II have poor stream.
The judgment principle that the busbar I and busbar II are run parallel is：Mother/section switch with every knife all in conjunction
Position；Or persistently there is stream without big poor stream, the current transformer of mother/section switch both sides.
The judgment principle of the current transformer circuit supervision fail of the mother/section switch both sides is：Big poor indifference stream and the section
The small difference of busbar has poor stream.
In the B operations of the step S3, short delay includes breaker intrinsic actuation time and quenching time and equipped with nargin
Adjustment time.
Beneficial effects of the present invention：
The current transformer of mother/section switch both sides is all accessed to busbar protective device by application claims, two
When the current transformer of side is without exception, the small difference difference stream cross-reference mother current transformer of busbar protective device；When wherein
It is disconnected when the current transformer of side breaks, and when two sections of mother/section switch connection busbares be in paired running
The current transformer of line is switched to using normal another current transformer so that the small poor differential current computing of busbar protective device is still
It is so correct, if failure still has, then is interconnected by short delay busbar, only differentiated by big poor stream jump busbar institute at this time
There is interval, cut off failure completely.So as to which current transformer of the busbar protective device in mother/section switch wherein side occurs
During broken string, failure occurs have alternative when on either segment busbar, and failure occurs in bus tie dead zone, is starting busbar I
Or after the bus differential protecting action of busbar II, if failure still suffers from, then is interconnected by short delay busbar, by big poor
Stream calculation, cuts off all intervals in busbar both ends of interconnection, cuts off failure completely.
Brief description of the drawings
Fig. 1 is busbar paired running decision logic figure.
Fig. 2 is double-bus main wiring diagram.
Start I bus protection action logic figures when Fig. 3 is busbar paired running and mother no current transformer disconnection.
Fig. 4 is mother current transformer circuit supervision fail decision logic figure.
Start busbar I protection act logic charts when Fig. 5 is busbar paired running and mother/segmented current transformer disconnection.
Fig. 6 is double-bus (two groups of mother current transformers) main electrical scheme trouble point schematic diagram.
Fig. 7 is double-bus (single group mother current transformer) main electrical scheme trouble point schematic diagram.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
A kind of method for identifying bus differential region, comprises the following steps：
S1：The current transformer for the mother/section switch both sides for connecting busbar I and busbar II is all accessed into bus protection
Device；
S2：Judge whether busbar I and busbar II is in the parallel method of operation；
S3：When busbar I and busbar II is in the parallel method of operation, the generation position of failure judgement, performs different behaviour
Make：
(1) when failure occurs outside bus-bar area, then busbar protective device does not start busbar I and/or the busbar of busbar II is poor
Dynamic protection act；
(2) when failure occur on busbar or in mother/segmentation dead band, judge the electricity of mother/section switch both sides
Whether current transformer breaks, and busbar protective device performs following operation：
A is operated：When the current transformer of both sides does not break, the current cross of mother/section switch is included in small
Poor difference stream, busbar protective device calculate the female small difference difference streams of I, the female small difference difference streams of II and big poor stream respectively, and start busbar I with/
Or the bus differential protecting action of busbar II；
B is operated：When the wherein current transformer circuit supervision fail of side, when failure occurs on busbar, busbar protective device exists
When calculating small difference difference stream, the female small difference difference streams of I and the female small difference difference streams of II use the Current calculation of normal current transformer, and open
The bus differential protecting action of dynamic busbar I or busbar II；When failure occurs in dead band, starting the mother of busbar I or busbar II
After the action of line differential protection, failure still suffers from, then is interconnected by short delay busbar, mutual by big poor differential current computing, excision
All intervals in busbar both ends of connection, cut off failure completely.
The step S3 A operation in, when the current transformer of both sides does not break, busbar protective device it is small poor
Flow the current transformer of cross-reference mother/section switch both sides；Each current transformer on the female small poor stream=I busbares of difference of I
Current value+mother/section switch side remote I mothers current transformer current value；The female small poor stream=II of difference of II are female
The current value of the current transformer of the remote II mothers of current value+mother/section switch side of each current transformer on line；
The electricity of each current transformer on big poor stream=busbar I and busbar II in addition to mother/section switch current transformer
The sum of flow valuve.
In A and the B operation of the step S3, the entry condition of mother's I bus differential protecting action is：It is poor greatly to have difference stream and I
Female small difference has poor stream；The entry condition of mother's II bus differential protecting action is：Big poor have that difference flows and the female small differences of II have poor stream.
The judgment principle that the busbar I and busbar II are run parallel is：Mother/section switch with every knife all in conjunction
Position；Or persistently there is stream without big poor stream, the current transformer of mother/section switch both sides.
The judgment principle of the current transformer circuit supervision fail of the mother/section switch both sides is：Big poor indifference stream condition and
The small difference of this section of busbar has poor stream.
In the B operations of the step S3, short delay includes breaker intrinsic actuation time and quenching time and equipped with nargin
Adjustment time.
The method of invention is described in detail below by specific embodiment.
As shown in Figure 1, as busbar I and busbar II paired runnings, the criterion of paired running is as shown in Figure 1, judge
The condition of busbar paired running is to meet busbar breaker and the condition every knife all in conjunction position, or meets big poor mobile equilibrium
When mother mutual inductor persistently meet the condition that there is stream.
As shown in Fig. 2, when mother current transformer circuit supervision fail does not occur, it is small poor that the electric current of busbar breaker is included in
Stream, Current Transmit 2, CT3, CT5 form the female small difference difference streams of I, and it is female small poor that Current Transmit 1, CT4, CT6 form II
Stream, CT3, CT5 and CT4, CT6 form big poor stream, it starts the logic chart of mother's I bus differential protecting as shown in figure 3, starting II
Female bus differential protecting logic chart is to change mother's I information in Fig. 3 into mother II information.
As shown in figure 4, the criterion of mother current transformer (CT1 and CT2) broken string is：Meet big poor indifference stream condition
And meet that the small difference of this section of busbar has poor stream condition at the same time.When mother current transformer circuit supervision fail occurs, shown in Fig. 2, to work as mother
When Current Transmit 2 breaks, after meeting the mother current transformer circuit supervision fail condition shown in Fig. 4, the female small poor differential current computings of I
Used busbar transformer current is switched over using another group, i.e., switches to another group of CT1 by this group of CT2, at this time electric current
Mutual inductor CT1, CT3, CT5 form the female small difference differences of I and flow, and Current Transmit 1, CT4, CT6 form the female small difference differences of II and flow, CT3,
CT5 forms big poor stream with CT4, CT6, and I is female and the female small differences of II still have busbar alternative, starts mother's I bus differential and protects
It is as shown in Figure 5 to protect logic chart.When failure occurs in mother I K1 trouble points, the female small difference difference streams of I that CT1, CT3, CT5 are formed meet
Operation condition, CT1, CT4, CT6 form the female small poor streams of difference of II and are unsatisfactory for operation condition, therefore fault bus mother's I differential protection moves
Make, action behavior has fault bus section selectivity；When failure occurs in mother II K2 trouble points, what CT1, CT4, CT6 were formed
The female small poor streams of difference of II meet operation condition, and the female small poor streams of difference of the I that CT1, CT3, CT5 are formed are unsatisfactory for operation condition, therefore failure
Busbar mother II differential protection acts, and action behavior has fault bus section selectivity；
When failure occurs in bus tie dead zone K3, the female small poor streams of difference of II meet operation condition, therefore mother's II differential protection moves
Make, but since trouble point occurs in bus tie dead zone, failure still has after the female small difference difference flowings of II are made, and is cut off through short delay t mutual
Join all intervals of busbar, short delay t is by breaker intrinsic actuation time+quenching time and leaves certain nargin time setting.
Bus-bar fault is thoroughly cut off, and still has selectivity using the protection of this method.When failure occurs in bus tie dead zone K4, mother II is small
Poor stream meets operation condition, therefore failure removal after the action of mother's II differential protection, action behavior are selected with fault bus section
Property, outside busbar area during K5 and K6 trouble points, bus-bar area failure is not belonging to, is unsatisfactory for that I is female, the female small difference difference stream operation conditions of II,
Bus differential protecting is reliably failure to actuate.
Similarly, after mother Current Transmit 1 breaks, busbar mutual inductor used in the female small poor differential current computings of II
Electric current is switched over using another group, i.e., switches to another group of CT2 by this group of CT1, at this time Current Transmit 2, CT3, CT5 structure
Into the female small difference difference streams of I, Current Transmit 2, CT4, CT6 form the female small difference difference streams of II, and CT3, CT5 and CT4, CT6 form big poor
Difference stream, I is female and the female small differences of II still have busbar alternative, starts mother's II bus differential protecting logic chart as shown in figure 5, will
Mother's I information changes mother's II information into Fig. 5.
Trouble point in table 1 corresponds to Fig. 6,1 data of table be with double-bus (two groups of mother current transformers) main electrical scheme, when
The front and rear comparative result of broken string occurs for busbar paired running and mother Current Transmit 2, is not difficult to find out from comparative result, uses
This method stepmother's line options are more accurate, and busbar trip range shorter when failure is thoroughly cut off, reduces power failure range, improve
Electricity consumption reliability.
Table 2 does not apply the comparative result with applying this method for the circuit shown in Fig. 6, is not difficult to find out from comparative result,
More accurate using this method stepmother's line options, busbar trip range shorter when failure is thoroughly cut off, reduces power failure range, carries
High electricity consumption reliability.
Circuit diagram in Fig. 7 is with double-bus (single group mother current transformer) main electrical scheme, and data are shown in Fig. 6 two in table 3
The access of group mother mutual inductor and mother transformer disconnection occurs, apply this patent proposition inventive method with shown in Fig. 7
Comparative result when only one group of mother mutual inductor switching and generation mother transformer disconnection, is not difficult to find out from comparative result, uses
This method stepmother's line options are more accurate, and busbar trip range shorter during failure, reduces power failure range, it is reliable to improve electricity consumption
Property.
Table 1
| Before CT1 broken strings | After CT1 broken strings | |
| K1 failures | It is female to cut off I | It is female to cut off I |
| K2 failures | It is female to cut off II | It is female to cut off II |
| K3 failures | It is female to cut off I, II | It is female to cut off I, II |
| K4 failures | It is female to cut off I, II | It is female to cut off II |
| K5 failures | Reliably it is failure to actuate | Reliably it is failure to actuate |
| K6 failures | Reliably it is failure to actuate | Reliably it is failure to actuate |
Table 2
| The method of the present invention is not applied | Using the method for the present invention | |
| K1 failures | It is female to cut off I, II | It is female to cut off I |
| K2 failures | It is female to cut off I, II | It is female to cut off II |
| K3 failures | It is female to cut off I, II | It is female to cut off I, II |
| K4 failures | It is female to cut off I, II | It is female to cut off II |
| K5 failures | Reliably it is failure to actuate | Reliably it is failure to actuate |
| K6 failures | Reliably it is failure to actuate | Reliably it is failure to actuate |
Table 3
The basic principles, main features and the advantages of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (6)
- A kind of 1. method for identifying bus differential region, it is characterised in that comprise the following steps：S1：The current transformer for the mother/section switch both sides for connecting busbar I and busbar II is all accessed into bus protection dress Put；S2：Judge whether busbar I and busbar II is in the parallel method of operation；S3：When busbar I and busbar II is in the parallel method of operation, the generation position of failure judgement, performs different operations：(1) when failure occurs outside bus-bar area, then busbar protective device does not start the bus differential of busbar I and/or busbar II Protection act；(2) when failure occur on busbar or in mother/segmentation dead band, judge that the electric current of mother/section switch both sides is mutual Whether sensor breaks, and busbar protective device performs following operation：A is operated：When the current transformer of both sides does not break, it is small poor that the current cross of mother/section switch is included in Stream, busbar protective device calculates the female small difference difference streams of I, the female small difference difference streams of II and big poor stream respectively, and starts busbar I and/or mother The bus differential protecting action of line II；B is operated：When the wherein current transformer circuit supervision fail of side, when failure occurs on busbar, busbar protective device is calculating During small difference difference stream, the female small difference difference streams of I and the female small difference difference streams of II use the Current calculation of normal current transformer, and start mother The bus differential protecting of line I or busbar II act；It is poor in the busbar for starting busbar I or busbar II when failure occurs in dead band After dynamic protection act, if failure still suffers from, then is interconnected by short delay busbar, pass through big poor differential current computing, excision interconnection All intervals in busbar both ends, cut off failure completely.
- A kind of 2. method for identifying bus differential region according to claim 1, it is characterised in that：The A of the step S3 In operation, when the current transformer of both sides does not break, small difference difference stream cross-reference mother/segmentation of busbar protective device is broken The current transformer of road device both sides.
- A kind of 3. method for identifying bus differential region according to claim 1, it is characterised in that：The A of the step S3 In being operated with B, the entry condition of mother's I bus differential protecting action is：Big poor have that difference flows and the female small differences of I have poor stream；The II is female Bus differential protecting action entry condition be：Big poor have that difference flows and the female small differences of II have poor stream.
- A kind of 4. method for identifying bus differential region according to claim 1, it is characterised in that：The busbar I and mother The judgment principle that line II is run parallel is：Mother/section switch with every knife all in close position；Or without big poor stream, mother/ The current transformer of section switch both sides persistently has stream.
- A kind of 5. method for identifying bus differential region according to claim 1, it is characterised in that：Mother/the segmentation The judgment principle of the current transformer circuit supervision fail of breaker both sides is：The big poor indifference stream and small difference of this section of busbar has poor stream.
- A kind of 6. method for identifying bus differential region according to claim 1, it is characterised in that：The B of the step S3 In operation, short delay includes breaker intrinsic actuation time and quenching time and the adjustment time equipped with nargin.
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| CN106549367B (en) * | 2016-10-20 | 2019-03-19 | 许继集团有限公司 | A kind of differential protection method for bus and device for mother CT exception |
| CN106655113B (en) * | 2016-12-29 | 2018-11-09 | 许继集团有限公司 | A kind of bus tie dead zone fault identification and fault protecting method |
| CN108666989A (en) * | 2018-05-22 | 2018-10-16 | 南京南瑞继保电气有限公司 | A kind of differential protecting method and device applied to bus tie dead zone failure |
| CN109088401A (en) * | 2018-08-23 | 2018-12-25 | 国网天津市电力公司 | A kind of double-bus differential protection circuit constituted based on current direction principle |
| CN110601149B (en) * | 2019-09-23 | 2020-12-04 | 江苏联能电力科学研究院有限公司 | Bus protection method and device based on redundant differential current judgment |
| CN111030058B (en) * | 2019-11-28 | 2023-03-31 | 南京国电南自电网自动化有限公司 | Power distribution network partition protection method based on 5G communication |
| CN111193246B (en) * | 2020-01-16 | 2023-07-14 | 贵州电网有限责任公司 | Fault removal method considering operation mode and switching characteristics |
| CN111711177A (en) * | 2020-06-02 | 2020-09-25 | 国网浙江省电力有限公司电力科学研究院 | Station domain protection method and system for coping with disconnection of current transformer |
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| JP3808624B2 (en) * | 1998-04-21 | 2006-08-16 | 株式会社東芝 | System protection relay device |
| CN104868451B (en) * | 2015-04-10 | 2016-02-03 | 国网山东省电力公司 | Realize GIS fault precisely to excise and the bus protection algorithm of automatic recovery of power supply |
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