CN105207187B - A kind of zero sequence enclosed type digital current protection method - Google Patents
A kind of zero sequence enclosed type digital current protection method Download PDFInfo
- Publication number
- CN105207187B CN105207187B CN201510734303.0A CN201510734303A CN105207187B CN 105207187 B CN105207187 B CN 105207187B CN 201510734303 A CN201510734303 A CN 201510734303A CN 105207187 B CN105207187 B CN 105207187B
- Authority
- CN
- China
- Prior art keywords
- protection
- digital current
- current
- phase
- split
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses a kind of zero sequence enclosed type digital current protection method, comprises the following steps：It is divided into the protection of split-phase digital current during digital current the protection implement and zero sequence digital current protects two parts, while the protection of configuration split-phase digital current and the protection of zero sequence digital current；When not containing zero-sequence current in short-circuit current, the protection of zero sequence digital current is failure to actuate, and failure is protected by split-phase digital current and cut off；When containing zero-sequence current in short-circuit current, zero sequence digital current protection act and the protection of locking split-phase digital current, earth fault is by the excision of zero sequence digital current protection act.The cooperation that the present invention is protected by split-phase and zero sequence digital current, solve the problems, such as that split-phase digital current protects the easy malfunction in high resistance earthing fault, the protection scope of application is wider, has great practical value.
Description
Technical field
The present invention relates to a kind of exchange ring network power supply system suitable for subway, urban light rail and tramcar, and tool
There are the zero sequence enclosed type digital current protection method of the electric power system in other fields of similar network structure, more particularly to one kind zero
Sequence enclosed type digital current protection method.
Background technology
For the Feeding System of Urban Rail Transit using ring statements based on collusion electrically, the selectivity of digital current protection is strong, moves
It is short to make the time, can be applied to a variety of methods of operation, therefore the application in subway Medium voltage power supply system is more and more extensive.
But go deep into along with application, digital current protection in application process also show some shortcomings, it is necessary to
Improve.It is in particular in, when adjusting split-phase digital current definite value and breakdown judge section startup definite value according to maximum load current,
Although can ensure the sensitivity of protection, in single-phase high-impedance, the protection of split-phase digital current easily misses
Action.
Fig. 1 is high resistance earthing fault time-division phase digital current false protection reason schematic diagram.In order to ensure the sensitive of protection
Property, the protection definite value of 102 breakers is adjusted according to 1.5 times of maximum load currents in figure, and split-phase current ration is 320A；In figure
101 and 121 breakers are adjusted according to 1.1 times of maximum load currents, and split-phase current ration is respectively 210A and 150A.When bus is born
When carrying compared with 140A is reached as large as transformer load electric current, now in the event of the high resistance ground event in the range of 103 breaker protections
Barrier, and faulted phase current is 200A, it will cause 102 breakers to be mistaken for troubles inside the sample space, so as to malfunction, expand power outage
Scope.
Reason of false action is as follows：Flow through the fault currents of 102 breakers for high resistance ground short circuit current and load current and
Electric current, i.e. 200A+140A=340A, definite value 320A, therefore 102 breakers point are protected more than 102 breaker split-phase digital currents
The protection of phase digital current starts timing；The fault current for flowing through 101 breakers is high resistance ground short circuit current 200A, less than 101
Circuit breaker failure judges section starting current definite value 210A, therefore 101 protection device for circuit breaker will not send split-phase to 102 breakers
Block signal；The electric current for flowing through 121 breakers is load current 140A, judges that section starting current is determined less than 121 circuit breaker failures
Value 150A, therefore 121 protection device for circuit breaker will not send split-phase block signal to 102 breakers.
After the protection of 102 breaker split-phase digital currents starts timing, do not received always in the 50ms of fixed value adjusting adjacent
The split-phase breakdown judge section enabling signal of the breaker of right side 101 and 121, therefore failure judgement is located at the protection of 102 right of circuit breaker
In area, trip protection outlet, the breaker of tripping 102.
And actual high resistance earthing fault, in 103 protection zones, so 102 breakers belong to malfunction, malfunction result in
The expansion of power failure range, serious threat is caused to the reliability of electric power system.
For above-mentioned fault type, there is presently no the solution method of maturation in open source information.If power supply can be combined
The design feature of system, a solution is proposed, by with good social and economic benefit.
The content of the invention
The purpose of the present invention, it is to provide a kind of zero sequence enclosed type digital current protection method, a kind of this zero sequence enclosed type
Digital current protection method is provided effective it is possible to prevente effectively from the malfunction of high resistance earthing fault time-division phase digital current protection
Scheme is cut off to high resistance earthing fault.
In order to reach above-mentioned purpose, solution of the invention is：A kind of zero sequence enclosed type digital current protection method, its
It is characterised by comprising the following steps：It is divided into the protection of split-phase digital current and the protection of zero sequence digital current during digital current the protection implement
Two parts, while the protection of configuration split-phase digital current and the protection of zero sequence digital current；When being free of in short-circuit current
When having zero-sequence current, the protection of zero sequence digital current is failure to actuate, and failure is protected by split-phase digital current and cut off；Work as short-circuit current
In when containing zero-sequence current, zero sequence digital current protection act and locking split-phase digital current is protected, earth fault is by zero sequence number
Word current protection act is cut off.
Further, the zero sequence digital current is protected is for locking split-phase digital current method：Produced in electric power system
After raw zero-sequence current, if zero-sequence fault judges section enabling signal for logic " true ", the split-phase breakdown judge with device is forced
Section enabling signal is also logic " true ".
Further, described digital current protection comprises the following steps：Each breaker is configured in exchange looped network
Protection device all pass through interconnected Web broadcast and send two kinds of breakdown judge section enabling signals of split-phase and zero sequence, two kinds of letters
Number definite value be independently arranged；When phase current judges section enabling signal for logic " true " more than split-phase definite value time-division phase fault, when zero
Zero-sequence fault judges section enabling signal for logic " true " when sequence electric current is more than zero sequence definite value.
Further, the digital current protection comprises the following steps：Determine when phase current is more than the protection of split-phase digital current
During value, the protection of split-phase digital current starts, and receives the split-phase breakdown judge section enabling signal for closing on breaker；According to signal come
Source is located at the left side of protection device or right side is divided into two groups, thinks if having a signal to be logic " true " in every group of signal
This group of signal is logic " true "；If two groups of signals of both sides are all logic " true ", the protection of split-phase digital current is blocked simultaneously
It is judged as external area error；Otherwise, through fixed value adjusting delay time split-phase digital current protection quick acting outlet excision failure.
Further, the digital current protection comprises the following steps：When zero-sequence current is protected more than zero sequence digital current
During definite value, the protection of zero sequence digital current starts, and receives and close on the zero-sequence fault of breaker and judge section enabling signal；According to signal
Source is located at the left side of protection device or right side is divided into two groups, recognizes if having a signal to be logic " true " in every group of signal
It is logic " true " for this group of signal；If two groups of signals of both sides are all logic " true ", the protection of zero sequence digital current is blocked
And it is judged as external area error；Otherwise, through fixed value adjusting delay time zero sequence digital current protection quick acting outlet excision failure.
The protection device that each breaker is configured in subway exchange looped network sends split-phase and zero by Web broadcast
Two kinds of breakdown judge section enabling signals of sequence, the definite value of two kinds of signals are independently arranged；The split-phase event when phase current is more than split-phase definite value
Barrier judges section enabling signal for logical truth, and when zero-sequence current is more than zero sequence definite value, zero-sequence fault judges section enabling signal for logic
Very.
The action logic of split-phase digital current protection is as follows：When phase current is more than split-phase digital current protection definite value, point
The protection of phase digital current starts, and receives the split-phase breakdown judge section enabling signal for closing on breaker；It is located at according to signal source
The left side or right side of protection device are divided into two groups, think that the group is believed if having a signal to be logic " true " in every group of signal
Number it is logic " true "；If two groups of signals of both sides are all logic " true ", the protection of split-phase digital current is blocked and is judged as
External area error；Otherwise, through fixed value adjusting delay time split-phase digital current protection quick acting outlet excision failure.
The action logic of zero sequence digital current protection is as follows：When zero-sequence current is more than zero sequence digital current protection definite value,
The protection of zero sequence digital current starts, and receives and close on the zero-sequence fault of breaker and judge section enabling signal；According to signal source position
It is divided into two groups in the left side of protection device or right side, thinks the group if having a signal to be logic " true " in every group of signal
Signal is logic " true "；If two groups of signals of both sides are all logic " true ", the protection of zero sequence digital current is blocked and judged
For external area error；Otherwise, through fixed value adjusting delay time zero sequence digital current protection quick acting outlet excision failure.
In order to solve the problems, such as that split-phase digital current protects the easy malfunction in high resistance earthing fault, in above-mentioned digital current
On the basis of protection scheme, increase following some corrective measures, as described in Figure 2：
1) it is divided into " protection of split-phase digital current " and " protection of zero sequence digital current " two portions during digital current the protection implement
Point, and " protection of split-phase digital current " and " protection of zero sequence digital current " must configure simultaneously, to realize to whole failure modes
Protection excision.
2) two-phase and during three phase short circuit fault, does not have zero-sequence current, the protection of zero sequence digital current will not be moved in fault current
Make, failure is protected by split-phase digital current and cut off；In ground short circuit failure, contain zero-sequence current in fault current, now zero
Ordinal number word current protection blocking split-phase digital current is protected, to prevent split-phase digital current from protecting the malfunction in the case of high resistance ground
Make, earth fault is protected by zero sequence digital current and cut off.
3) method of zero sequence digital current protection blocking split-phase digital current protection is：It is electric when producing zero sequence in electric power system
After stream, if zero-sequence fault judges section enabling signal for logic " true ", the split-phase breakdown judge section with device is forced to start letter
Number also it is logic " true ".
Because zero-sequence current belongs to fault sequence component electric current, only can be just detected when power system is broken down, its
Fixed value adjusting is very sensitive, and all earth faults including high resistance earthing fault can effectively be cut off.
A kind of zero sequence enclosed type digital current protection method of the present invention, including following content：(1) digital current protection method
It is divided into " protection of split-phase digital current " and " protection of zero sequence digital current " two parts during implementation；(2) two-phase and three-phase shortcircuit event
During barrier, there is no zero-sequence current in electric power system, failure is protected by split-phase digital current and cut off；(3) during single-phase grounding fault,
Zero-sequence current is produced in electric power system, the protection of split-phase digital current is blocked, to prevent the protection of split-phase digital current from being connect in high resistant
Malfunctioned during earth fault, earth fault cuts off failure by zero sequence digital current protective seletion.The method passes through split-phase and zero sequence
The cooperation of digital current protection, solve the problems, such as that split-phase digital current protects the easy malfunction in high resistance earthing fault, protection
The scope of application is wider, has great practical value.
Brief description of the drawings
Fig. 1 high resistance earthing fault time-division phase digital current false protection reason schematic diagrames；
In figure, protection definite value is that split-phase digital current protects definite value, is divided into current ration and time definite value；Starting definite value is
The protection of split-phase digital current starts definite value, including current ration but no time definite value；Bus load for 1 rectifier transformer and
Rectification Power Factor.
Fig. 2 zero sequence enclosed type digital current protection method schematic diagrames；
Embodiment
Referring to Fig. 1 and Fig. 2, a kind of this zero sequence enclosed type digital current protection method, comprise the following steps：Digital current is protected
Shield is divided into the protection of split-phase digital current when implementing and zero sequence digital current protects two parts, while configuration split-phase numeral electricity
Stream protection and the protection of zero sequence digital current；When not containing zero-sequence current in short-circuit current, zero sequence digital current is protected not
Action, failure are protected by split-phase digital current and cut off；When containing zero-sequence current in short-circuit current, zero sequence digital current is protected
Shield is acted and locking split-phase digital current is protected, and earth fault is cut off by zero sequence digital current protection act.
The zero sequence digital current is protected is for locking split-phase digital current method：Zero-sequence current is produced in electric power system
Afterwards, if zero-sequence fault judges section enabling signal for logic " true ", the split-phase breakdown judge section enabling signal with device is forced
Also it is logic " true ".Described digital current protection comprises the following steps：The guarantor that each breaker is configured in exchange looped network
Protection unit all sends two kinds of breakdown judge section enabling signals of split-phase and zero sequence by interconnected Web broadcast, two kinds of signals
Definite value is independently arranged；When phase current judges section enabling signal for logic " true " more than split-phase definite value time-division phase fault, when zero sequence electricity
Zero-sequence fault judges section enabling signal for logic " true " when stream is more than zero sequence definite value.The digital current protection includes following step
Suddenly：When phase current is more than split-phase digital current protection definite value, the protection of split-phase digital current starts, and receives and close on breaker
Split-phase breakdown judge section enabling signal；The left side of protection device is located at according to signal source or right side is divided into two groups, if often
It is that logic " true " then thinks that this group of signal is logic " true " to have a signal in group signal；If two groups of signals of both sides are all to patrol
"true" is collected, then split-phase digital current protection is blocked and is judged as external area error；Otherwise, through fixed value adjusting delay time split-phase number
Word current protection quick acting outlet excision failure.The digital current protection comprises the following steps：When zero-sequence current is more than zero
When ordinal number word current protects definite value, the protection of zero sequence digital current starts, and receives and close on the zero-sequence fault of breaker and judge Duan Qi
Dynamic signal；The left side of protection device is located at according to signal source or right side is divided into two groups, if there is a letter in every group of signal
Number it is that logic " true " then thinks that this group of signal is logic " true "；If two groups of signals of both sides are all logic " true ", zero sequence number
Word current protection is blocked and is judged as external area error；Otherwise, protected through fixed value adjusting delay time zero sequence digital current quick
Action outlet excision failure.
Below with reference to accompanying drawing 1, technical scheme is described in detail.
It is the basis for realizing technical solution of the present invention to realize digital current defencive function.Realize that digital current is protected, first
Need to set up communication network, to ensure to realize that the protection device of circuit breakers in urban track traffic ring string data electric power system can
To realize the quick transmission of signal using communication network.Communication network can select GOOSE network, can also select as other nets
Network.Specific in accompanying drawing 1, the protection devices of 101,102,103,121 breakers must access to communication networks, and can be by logical
Communication network transmits breakdown judge section enabling signal.
The protection device that each breaker is configured in Fig. 1 sends two kinds of split-phase and zero sequence by communications network broadcast
Breakdown judge section enabling signal, the definite value of two kinds of signals are independently arranged；When the phase current that protection device collects is determined more than split-phase
Value time-division phase fault judges section enabling signal for logic " true "；When the zero-sequence current that protection device collects is more than zero sequence definite value
Zero-sequence fault judges section enabling signal for logic " true ".
The digital current protection domain of each breaker is between this breaker and circuit breakers；For protection domain
Interior failure is troubles inside the sample space, and digital current protection, which should trip, cuts off failure；Failure outside for protection domain is external area error,
Digital current protection should not trip, and otherwise be exactly to malfunction.By taking 102 breakers in Fig. 1 as an example, its right side protection domain is
102nd, the bus between 101 and 121 3 breakers, its power line of left side protection domain between 100 and 102 breakers
Road.
The action logic of split-phase digital current protection is as follows：When phase current is more than split-phase digital current protection definite value, point
The protection of phase digital current starts, and the split-phase breakdown judge section startup letter for closing on breaker is received in fixed value adjusting delay time
Number；The left side of protection device is located at according to signal source or right side is divided into two groups, if there is the signal to be in every group of signal
Logic " true " then thinks that this group of signal is logic " true "；If two groups of signals of both sides are all logic " true ", prolong by definite value
When the time after split-phase digital current protection be blocked and be judged as external area error；Otherwise, split-phase digital current protection quick acting
Outlet excision failure.
The action logic of zero sequence digital current protection is as follows：When zero-sequence current is more than zero sequence digital current protection definite value,
Zero sequence digital current protection start, and in fixed value adjusting delay time receive close on breaker zero-sequence fault judge section startup
Signal；The left side of protection device is located at according to signal source or right side is divided into two groups, if there is a signal in every group of signal
Then think that this group of signal is logic " true " for logic " true "；If two groups of signals of both sides are all logic " true ", by definite value
The protection of zero sequence digital current is blocked and is judged as external area error after delay time；Otherwise, zero sequence digital current protects fast quick-action
Failure is cut off for export.
By taking 102 breakers in Fig. 1 as an example, its left side circuit breakers is 100 breakers；Circuit breakers are on the right side of it
101 and 121 breakers.Because Feeding System of Urban Rail Transit is single supply system, when 102 right of circuit breaker protection zones of generation
During interior AB phases short trouble, phase fault electric current flows through 100 and 102 breakers.After the protection of 102 breaker split-phase digital currents starts
Start timing, because the 102 left and right sides faulty electric current of only 100 breakers flows through, so within the delay definite value time, 102
Breaker is only capable of receiving the left side block signal of 100 breakers representative, and right side does not have block signal all the time.Patrolled according to action
Volume, the protection of split-phase digital current is determined as troubles inside the sample space, the breaker of tripping 102.
For the failure of 103 right of circuit breaker, external area error during to 102 breaker, when AB phases short trouble outside generating region
When, phase fault electric current flows through 100,102 and 101 breakers.The protection of 102 breaker split-phase digital currents starts timing after starting,
Each side there are 100 breakers and the faulty electric current of 101 breakers to flow through due to 102, so within the delay definite value time,
102 breakers can not only receive the left side block signal of 100 breakers representative, can also receive the right side of 101 breakers representative
Side block signal.According to action logic, the protection of split-phase digital current is determined as external area error, and protection is failure to actuate.
During earth fault, protection device can not only detect the phase current in electric power system, may also detect that zero sequence electricity
Stream, now zero sequence digital current relay protective scheme will automatically engage.The protection of zero-sequenceprotection logical AND split-phase digital current is similar, no longer
Repeat specification.
After realizing above-mentioned digital current defencive function, continue to realize following combinative movement logic, to realize the present invention's
Main contents.
1) it is divided into " protection of split-phase digital current " and " protection of zero sequence digital current " two portions during digital current the protection implement
Point, and " protection of split-phase digital current " and " protection of zero sequence digital current " must configure simultaneously, to realize to whole failure modes
Protection excision.By taking 102 breakers in Fig. 1 as an example, the protection of split-phase digital current and the protection of zero sequence digital current must be thrown simultaneously
Enter.
2) two-phase and during three phase short circuit fault, does not have zero-sequence current, the protection of zero sequence digital current will not be moved in electric power system
Make, failure is protected by split-phase digital current and cut off；In ground short circuit failure, zero-sequence current is produced in electric power system, now zero
Ordinal number word current protection blocking split-phase digital current is protected, to prevent split-phase digital current from protecting the malfunction in the case of high resistance ground
Make, earth fault is protected by zero sequence digital current and cut off.The reason of false action of split-phase digital current protection is referring in background technology
Related description.
3) method of zero sequence digital current protection blocking split-phase digital current protection is：It is electric when producing zero sequence in electric power system
After stream, if zero-sequence fault judges section enabling signal for logic " true ", the split-phase breakdown judge section with device is forced to start letter
Number also it is logic " true ".By taking 102 breakers in Fig. 1 as an example, when earth fault occurs in 103 right side regions, zero-sequence current flows through
100th, 101,102 and 103 totally 4 breakers, now no matter whether faulted phase current is more than the split-phase breakdown judge of corresponding breaker
Duan Qidong definite values, as long as the zero-sequence fault that zero-sequence current is more than corresponding breaker judges that section starts definite value, that is, force the breaker
Split-phase and zero-sequence fault judge section enabling signal for "true".
The technological thought of above example only to illustrate the invention, it is impossible to protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (5)
1. a kind of zero sequence enclosed type digital current protection method, it is characterised in that comprise the following steps：
It is divided into the protection of split-phase digital current during digital current the protection implement and zero sequence digital current protects two parts, while
Configure the protection of split-phase digital current and the protection of zero sequence digital current；
When not containing zero-sequence current in short-circuit current, the protection of zero sequence digital current is failure to actuate, and failure is by split-phase numeral electricity
Stream protection excision；
When containing zero-sequence current in short-circuit current, zero sequence digital current protection act and locking split-phase digital current guarantor
Shield, earth fault are cut off by zero sequence digital current protection act.
2. zero sequence enclosed type digital current protection method as claimed in claim 1, it is characterised in that the zero sequence digital current
Protect is for the method for locking split-phase digital current protection：After producing zero-sequence current in electric power system, if zero-sequence fault is sentenced
Disconnected section enabling signal is logic " true ", then pressure is also logic " true " with the split-phase breakdown judge section enabling signal of device.
3. zero sequence enclosed type digital current protection method as claimed in claim 1 or 2, it is characterised in that described digital current
Protection comprises the following steps：
In exchange looped network the protection device that is configured of each breaker by interconnected Web broadcast send split-phase and
Two kinds of breakdown judge section enabling signals of zero sequence, the definite value of two kinds of signals are independently arranged；
When phase current judges section enabling signal for logic " true " more than split-phase definite value time-division phase fault, when zero-sequence current is more than zero sequence
Zero-sequence fault judges section enabling signal for logic " true " during definite value.
4. zero sequence enclosed type digital current protection method as claimed in claim 1 or 2, it is characterised in that the digital current is protected
Shield comprises the following steps：
When phase current is more than split-phase digital current protection definite value, the protection of split-phase digital current starts, and receives and close on breaker
Split-phase breakdown judge section enabling signal；
The left side of protection device is located at according to signal source or right side is divided into two groups, if there is the signal to be in every group of signal
Logic " true " then thinks that this group of signal is logic " true "；
If two groups of signals of both sides are all logic " true ", the protection of split-phase digital current is blocked and is judged as external area error；
Otherwise, through fixed value adjusting delay time split-phase digital current protection quick acting outlet excision failure.
5. zero sequence enclosed type digital current protection method as claimed in claim 1 or 2, it is characterised in that the digital current is protected
Shield comprises the following steps：
When zero-sequence current is more than zero sequence digital current protection definite value, the protection of zero sequence digital current starts, and receives and close on open circuit
The zero-sequence fault of device judges section enabling signal；
The left side of protection device is located at according to signal source or right side is divided into two groups, if there is the signal to be in every group of signal
Logic " true " then thinks that this group of signal is logic " true "；
If two groups of signals of both sides are all logic " true ", the protection of zero sequence digital current is blocked and is judged as external area error；
Otherwise, through fixed value adjusting delay time zero sequence digital current protection quick acting outlet excision failure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510734303.0A CN105207187B (en) | 2015-10-31 | 2015-10-31 | A kind of zero sequence enclosed type digital current protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510734303.0A CN105207187B (en) | 2015-10-31 | 2015-10-31 | A kind of zero sequence enclosed type digital current protection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105207187A CN105207187A (en) | 2015-12-30 |
| CN105207187B true CN105207187B (en) | 2017-11-24 |
Family
ID=54954698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510734303.0A Active CN105207187B (en) | 2015-10-31 | 2015-10-31 | A kind of zero sequence enclosed type digital current protection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105207187B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608495A (en) * | 2012-03-02 | 2012-07-25 | 华北电力大学 | Fault phase selection method based on current break variable |
| CN202455055U (en) * | 2012-01-19 | 2012-09-26 | 无锡市科环自动化设备有限公司 | Current selective tripping and large-zone power supply protecting system of rail transit power supply system |
| CN103022989A (en) * | 2011-09-28 | 2013-04-03 | 南京南瑞继保电气有限公司 | Digital current protection method for alternating-current looped serial power supply mode of subways |
| JP2015149887A (en) * | 2014-02-07 | 2015-08-20 | 三菱電機株式会社 | Fault location analysis method and system of ungrounded power distribution system |
-
2015
- 2015-10-31 CN CN201510734303.0A patent/CN105207187B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022989A (en) * | 2011-09-28 | 2013-04-03 | 南京南瑞继保电气有限公司 | Digital current protection method for alternating-current looped serial power supply mode of subways |
| CN202455055U (en) * | 2012-01-19 | 2012-09-26 | 无锡市科环自动化设备有限公司 | Current selective tripping and large-zone power supply protecting system of rail transit power supply system |
| CN102608495A (en) * | 2012-03-02 | 2012-07-25 | 华北电力大学 | Fault phase selection method based on current break variable |
| JP2015149887A (en) * | 2014-02-07 | 2015-08-20 | 三菱電機株式会社 | Fault location analysis method and system of ungrounded power distribution system |
Non-Patent Citations (1)
| Title |
|---|
| 基于IEC61850的地铁中压供电环网过电流保护方案;徐皇清;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20140915;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105207187A (en) | 2015-12-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104953568B (en) | A kind of fault protecting method of flexible direct current power transmission system | |
| CN104779594B (en) | Small current neutral grounding power system phase fault and single-phase grounding comprehensive protecting method | |
| US8649131B2 (en) | Method and device for supervising secondary circuit of instrument transformer in power system | |
| Choudhary et al. | A review on microgrid protection | |
| CN103326335B (en) | System and method for false action resistance of distance section III based on domain double-type fault characteristic | |
| CN106786426B (en) | The comprehensive distinguishing method of one Ge Ban main electrical scheme substation dead-zone fault | |
| KR101505176B1 (en) | Apparatus and method for detecting failure of bus | |
| CN103412239B (en) | Detecting and positioning method of bus coupler flashover fault in subway alternating current power system | |
| Sharafi et al. | Transmission system wide-area back-up protection using current phasor measurements | |
| CN104362599A (en) | Method for protecting low-voltage bus of intelligent substation | |
| CN106159913B (en) | Multi-terminal flexible direct current system direct current fault protecting method | |
| CN105514926B (en) | A kind of method to be restored electricity after DC earthing protection starting tripping | |
| CN106501683A (en) | One kind is without main website power distribution network one-way earth fault localization method | |
| CN106026048A (en) | DC grid fault handling strategy based on in-situ detection and in -situ protection | |
| Krishnamurthy et al. | IEC61850 standard-based harmonic blocking scheme for power transformers | |
| CN205811531U (en) | Fault protection system for power distribution system | |
| CN101800441A (en) | Method for processing boundary information deficiency of centralization protector of digitalized converting station | |
| CN110932244B (en) | Relay protection method for no-switching of all-station protection outlet pressure plates of transformer substation | |
| CN101958579A (en) | Method of treating information loss in centralized protection device of digitalized substation | |
| CN105207187B (en) | A kind of zero sequence enclosed type digital current protection method | |
| CN208209513U (en) | A kind of mesolow DC distribution net bus protection relay system | |
| CN107404109A (en) | The failure of bus and blind area guard method | |
| CN110474302A (en) | A kind of mesolow DC distribution net bus protection relay system and method | |
| JP7181760B2 (en) | Protection control device for AC/DC converter station, protection control system for DC power transmission system, and protection control method for AC/DC converter station | |
| CN107317309A (en) | A kind of earthing mode Collaborative Control conversion method and system based on GOOSE |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |