CN106300254B - Route is single-phase or the relay protecting method of two-phase broken string for a kind of identification - Google Patents
Route is single-phase or the relay protecting method of two-phase broken string for a kind of identification Download PDFInfo
- Publication number
- CN106300254B CN106300254B CN201610892866.7A CN201610892866A CN106300254B CN 106300254 B CN106300254 B CN 106300254B CN 201610892866 A CN201610892866 A CN 201610892866A CN 106300254 B CN106300254 B CN 106300254B
- Authority
- CN
- China
- Prior art keywords
- phase
- route
- line
- current
- voltage
- 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
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000001681 protective effect Effects 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 230000000977 initiatory effect Effects 0.000 claims abstract description 4
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 8
- 230000004069 differentiation Effects 0.000 abstract description 5
- 230000008034 disappearance Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/353—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system involving comparison of phase voltages
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of identification, route is single-phase or the relay protecting method of two-phase broken string, the protective relaying device including starting and initiating line both ends；Protective relaying device carries out self-test, judges whether normally, after normal, the position signal and route both ends electric current, information of voltage of acquisition route both ends switch；Collected information is compared with line disconnection failure criterion, if signal is normal, is returned；If meeting line disconnection failure criterion, open-circuit line switch terminates this process.The present invention carries out the acquisition of data by existing device, realize the differentiation of circuit breaking, it is accurately analyzed and is differentiated so as to the electric current to three-phase electricity, voltage condition, and the mode that can be found line disconnection failure in time, and open-circuit line is taken to switch prevents line disconnection failure from generating harm to electrical equipment and power grid.The present invention has filled up the blank of the relay protecting method without being protected for circuit breaking.
Description
Technical field
The present invention relates to circuit relay protection technical field more particularly to a kind of identification, route is single-phase or two-phase broken string
Relay protecting method.
Background technique
Currently, since line disconnection failure is usually all along with line-to-ground, the relay protection dress current to ground fault
Setting accurately to be identified, and pure disconnection fault occurrence probability is very low, while relatively small to grid equipment harm,
Therefore currently without identifying that pure route is single-phase or the method for two-phase broken string.But route is single-phase or two-phase broken string is to very much
Electrical equipment can generate biggish harm, can also operate normally to power grid and generate adverse effect, since three-phase broken string will cause line
Road is fully disconnected, and cannot continue to power, similar with switching effect is disconnected, effective reply means existing at present, without specially opening
The method for sending out new, and need specifically for route is single-phase or the relay protecting method of two-phase disconnection fault overcomes this blind area
Defect.
Summary of the invention
The object of the present invention is to provide a kind of identification, route is single-phase or the relay protecting method of two-phase broken string, can be online
Road occurs to disconnect line related switch when single-phase or two-phase disconnection fault, thus the harm for avoiding line disconnection failure from generating,
Protect power grid and electrical equipment not by caused damage, the damage of disconnection fault.
The technical solution adopted by the present invention are as follows:
Route is single-phase or the relay protecting method of two-phase broken string for a kind of identification, comprises the following steps:
If lower step:
A), the protective relaying device at starting and initiating line both ends；It enters step b)；
Route itself is specifically included that using device, equipment needed for this method, is installed in the switch at route both ends, is installed
Circuit relay protection device at route both ends is installed in route both ends as circuit relay protection device and provides both ends current information
Current transformer, the voltage transformer of both end voltage information is provided, information communication line that route both ends are mutually transmitted and set
Link circuit etc. between standby and each unit；
B), protective relaying device carries out self-test, judges whether normally, if so, entering step c)；If it is not, return step b),
And issue alarm signal；
C), the position signal and route both ends electric current, information of voltage of acquisition route both ends switch；It enters step d)
D), the collected information of step c) is compared with line disconnection failure criterion, if signal is normal, is returned
Step c)；If meeting line disconnection failure criterion, enter step e)；
E), open-circuit line switchs；It enters step f)；
F), terminate this process；Equal routes restore after operating normally, and automatically begin to monitor that lower secondary line is single-phase or two-phase
Broken string.
Circuit breaking criterion described in step d) is any one group met in following 1. -2. three group operation condition
Condition:
1. in a certain time interval, when route both ends have the electric current of the identical phase electric wire of the same name of a phase or two-phase prominent
It becomes zero, the current break is that the current value that zero current transformer for being separately positioned on both ends monitors is less than has suddenly
Stream definite value and such case are continued for not less than defined judgement time t；
2. the three-phase current that route both ends when coincidence is set, occur for one end switch of route, which is respectively less than, stream definite value, while again
The imbalance of three-phase voltage value that the end occurs is more than definite value and such case is continued until the defined judgement time, while another
End switch also coincidence set and occur three-phase voltage be all larger than pressure definite value and imbalance of three-phase voltage value no more than operate normally
Maximum unbalance voltage definite value and such case determine the time as defined in being continued until.
The present invention carries out the acquisition of data by existing device, and when line current is larger, (both ends three-phase current is not
Less than there is stream definite value) by using and meanwhile meet any phase current in one end and be zero (phase current, which is less than, stream definite value) and receive another
One end is zero without stream information and one end three-phase current with famous prime minister and receives negative of the other end three-phase with famous prime minister without stream information in fact
The differentiation of an existing phase or two-phase circuit breaking；One end three-phase current is zero and receives other end three-phase with famous prime minister without stream information simultaneously
Also the circuit breaking logic at line current smaller (both ends three-phase current, which is respectively less than, stream definite value) is used to as Rule of judgment sentence
It is disconnected, when line current is smaller, set in coincidence by using two end switch, and one end three-phase current is zero and receives the other end
Three-phase is with famous prime minister without stream information, while route one end three-phase voltage is normal that (three-phase voltage has been all larger than pressure definite value and three-phase voltage
Unbalanced value is no more than operating normally maximum unbalance voltage definite value, it may be assumed that specified value) other end imbalance of three-phase voltage value is greater than
Operate normally maximum unbalance voltage definite value, it may be assumed that specified value realizes the differentiation of circuit breaking, so as to the electricity to three-phase electricity
Stream, voltage condition are accurately analyzed and are differentiated, and can find line disconnection failure in time, and open-circuit line is taken to switch
Mode prevent line disconnection failure from generating harm to electrical equipment and power grid.The present invention filled up without for circuit breaking into
The blank of the relay protecting method of row protection.
Detailed description of the invention
Flow chart Fig. 1 of the invention；
Fig. 2 is that heretofore described route is single-phase or total logic chart of two-phase disconnection fault criterion；
Fig. 3 be the end heretofore described route M route is single-phase or the logic chart of two-phase disconnection fault criterion.
Fig. 4 be heretofore described route N-terminal route is single-phase or the logic chart of two-phase disconnection fault criterion.
Specific embodiment
As illustrated in fig. 1 and 2, route is single-phase or the relay protecting method of two-phase broken string for a kind of identification, in which: if including
Lower step:
A), starting and initiating line both ends use this method (a kind of to identify power circuit broken string relay protection side
Method) protective relaying device；It enters step b)；
Using between device, equipment needed for this method and relevant device device connection type and existing circuit longitudinal
It protects completely the same, specifically includes that route itself, be installed in route both ends (, referred to as M end, N-terminal convenient for statement, similarly hereinafter)
Switch, be installed in the circuit relay protection device at route both ends, be installed in route both ends and provided for circuit relay protection device
The current transformer of both ends current information provides the voltage transformer of both end voltage information, the information that route both ends are mutually transmitted
Link circuit etc. between communication line and equipment and each unit, these are completely the same with the prior art, no longer in detail
It states.
B), whether self-check of device is normal, if so, entering step c)；If it is not, return step b)；
C), route both ends switch position signal and route both ends electric current, information of voltage are acquired；It enters step d)
D), these information are compared with line disconnection failure criterion, if satisfied, entering step e)；If signal
Normally, return step c)；
Circuit breaking criterion described in step d) is as follows:
Meet any group of condition in following three groups of operation conditions: 1. route both ends (end M and N-terminal) has a phase or two-phase
Current break is zero (that is: being less than suddenly has stream definite value) (in a certain time interval) when of the same name identical and such case is held always
Continue the defined judgement time；2. when coincidence is set, route both ends (end M and N-terminal) three-phase current occurs for route M end switch small
In there is stream definite value, at the same occur again the end M imbalance of three-phase voltage value be more than definite value and such case be continued until as defined in sentence
Fix time, at the same N-terminal switch coincidence set and occur N-terminal three-phase voltage be all larger than pressure definite value and imbalance of three-phase voltage it is little
In operate normally maximum unbalance voltage definite value and such case be continued until as defined in determine the time.3. route N-terminal is opened
It closes when coincidence is set, route both ends (end M and N-terminal) three-phase current, which occurs, respectively less than has stream definite value, while N-terminal three-phase electricity occurring again
It is more than definite value that pressure is uneven and such case is continued until the defined judgement time, while M end switch is set in coincidence and M occurs
End three-phase voltage be all larger than pressure definite value and imbalance of three-phase voltage no more than operate normally maximum unbalance voltage definite value and
Such case determines the time as defined in being continued until.
For in the 1. group condition " route both ends (end M and N-terminal) have a phase or two-phase it is of the same name identical when (in a timing
Between in interval) current break be zero (that is: being less than suddenly has stream definite value) " differentiation, using meeting route both ends three-phase simultaneously
In any one phase current of the same name be less than have stream definite value and route both ends three-phase phase current of the same name be both less than have stream definite value negative this
The logic of two groups of conditions come realize " route both ends (end M and N-terminal) have a phase or two-phase it is of the same name identical when (between certain time
Every interior) current break be zero (that is: being less than suddenly has stream definite value) " differentiation.Route both ends three-phase phase current of the same name is all small simultaneously
In there is stream this logical consequence of definite value that Rule of judgment is also used as 2. to organize and the logic judgment for 3. organizing for the.
E), open-circuit line switchs；It enters step f)；
F), terminate this process.Equal routes restore after operating normally, and automatically begin to monitor that lower secondary line is single-phase or two-phase
Broken string.
Since the protective relaying device the present invention relates to route is installed in the both ends of route, this must be just specifically incited somebody to action when control
Method decomposition implements to specific both ends, and wherein one end is the end M to note, and the other end is N-terminal, then after this method decomposes the end M
Logic is as follows:
It detects that the end M has a phase or biphase current to sport zero, sends the end M without the separate information of stream until electric current is big to N-terminal
There is stream definite value in being equal to, such as receives at the appointed time, the identical separate phase current that N-terminal is sent sports zero information,
And in defined delay, M client information is constant and can persistently receive N-terminal with famous prime minister without stream information, meets criterion.Or
It is that it is identical separate to detect that the end M has at the appointed time after receiving the information that N-terminal has a phase or biphase current to sport zero
Phase current sports zero, and sending the end M to N-terminal has stream definite value until electric current is more than or equal to without the separate information of stream, such as prolongs defined
When it is interior, M client information is constant and can persistently receive N-terminal with famous prime minister without stream information, that is, is judged to meet criterion.
For route M end switch when coincidence is set, route both ends three-phase current, which occurs, respectively less than has stream definite value, while M occurring again
Holding imbalance of three-phase voltage is more than that specified value just lasting (when any one, which occurs, in aforementioned condition to be unsatisfactory for) is permitted to N-terminal transmission
Perhaps signal (or stopping paying out block signal), at this moment and persistently receiving N allows signal (or block signal disappearance) and such case one
The time is determined as defined in directly continueing to, that is, is judged to meet criterion.
For route M end switch when coincidence is set, route both ends three-phase current, which occurs, respectively less than has stream definite value, and the end M three occurs
Phase voltage has been all larger than pressure definite value and imbalance of three-phase voltage is no more than maximum unbalance voltage definite value is operated normally, and at this moment holds again
Continued access, which receives N, allows signal (or block signal disappearance) just to continue (when any one, which occurs, in aforementioned condition to be unsatisfactory for) to N-terminal
Sending allows signal (or stopping paying out block signal), and such case holds always the defined judgement time, that is, is judged to meet and sentence
Other condition.
Logic chart such as Fig. 3.
The 1. in group condition, is believed with famous prime minister without stream using meeting any phase current in the end M simultaneously and sporting zero and receive N-terminal
Breath and the end M three-phase current sport zero and receive negative of the N-terminal three-phase with famous prime minister without stream information to realize sentencing for a phase or two-phase
Not, at the same the end M three-phase current sport zero and receive N-terminal three-phase be also used as with famous prime minister without stream information Rule of judgment for the 2.
Group and the logic judgment for 3. organizing.
It is as follows that this method decomposes the logic after N-terminal:
It detects that N-terminal has a phase or biphase current to sport zero, sends N-terminal without the separate information of stream until electric current is big to the end M
There is stream definite value in being equal to, such as receives at the appointed time, the identical separate phase current that M is sent at end sports zero information,
And in defined delay, N-terminal Information invariability and the end M can be persistently received with famous prime minister without stream information, meet criterion.Or
It is that it is identical separate to detect that the end M has at the appointed time after receiving the information that the end M has a phase or biphase current to sport zero
Phase current sports zero, and sending N-terminal to the end M has stream definite value until electric current is more than or equal to without the separate information of stream, such as prolongs defined
When it is interior, N-terminal Information invariability and can persistently receive the end M with famous prime minister without stream information, that is, be judged to meet criterion.
Route N-terminal is switched when coincidence is set, and route both ends three-phase current, which occurs, respectively less than has stream definite value, while N occurring again
Holding imbalance of three-phase voltage is more than that definite value just continues (when any one, which occurs, in aforementioned condition to be unsatisfactory for) to the transmission permission of the end M
Signal (or stopping paying out block signal) at this moment and persistently receives M permission signal (or block signal disappearance) and such case is always
The time is determined as defined in continueing to, that is, is judged to meet criterion.
Route N-terminal is switched when coincidence is set, and route both ends three-phase current, which occurs, respectively less than has stream definite value, and N-terminal three occurs
Phase voltage has been all larger than pressure definite value and imbalance of three-phase voltage is no more than maximum unbalance voltage definite value is operated normally, and at this moment holds again
Continued access, which receives M, allows signal (or block signal disappearance) just to continue (when any one, which occurs, in aforementioned condition to be unsatisfactory for) to the end M
Sending allows signal (or stopping paying out block signal), and such case holds always the defined judgement time, that is, is judged to meet and sentence
Other condition.
Logic chart such as Fig. 4.
The 1. in group condition, is believed with famous prime minister without stream using meeting any phase current of N-terminal simultaneously and sporting zero and receive the end M
Breath and N-terminal three-phase current sport zero and receive negative of the end the M three-phase with famous prime minister without stream information to realize sentencing for a phase or two-phase
Not, at the same N-terminal three-phase current sport zero and receive the end M three-phase be also used as with famous prime minister without stream information Rule of judgment for the 2.
Group and the logic judgment for 3. organizing.
The present invention can monitor existing power grid power supply in real time, carry out power supply monitoring, accurate area to existing power grid electrical equipment
Entire grid cut-off and single-phase to power supply line or two-phase breaks when independent power source is powered, and can be into when powering off
Row automatic closing control, so that the harm for avoiding power circuit broken string that from generating electrical equipment, avoids equipment from damaging
The generation of accident.
Claims (2)
1. route is single-phase or the relay protecting method of two-phase broken string for a kind of identification, it is characterised in that: comprise the following steps:
If lower step:
A), the protective relaying device at starting and initiating line both ends；It enters step b)；
Route itself is specifically included that using device, equipment needed for this method, is installed in the switch at route both ends, and installing is online
The circuit relay protection device at road both ends is installed in route both ends as circuit relay protection device and provides the electricity of both ends current information
The voltage transformer of current transformer, offer both end voltage information, the information communication line and equipment that route both ends are mutually transmitted, with
And link circuit between each unit etc.；
B), protective relaying device carries out self-test, judges whether normally, if so, entering step c)；If it is not, return step b), concurrently
Alarm signal out；
C), the position signal and route both ends electric current, information of voltage of acquisition route both ends switch；It enters step d)
D), the collected information of step c) is compared with line disconnection failure criterion, if signal is normal, return step
C)；If meeting line disconnection failure criterion, enter step e)；
E), open-circuit line switchs；It enters step f)；
F), terminate this process；Equal routes restore after operating normally, and automatically begin to monitor that lower secondary line is single-phase or two-phase is disconnected
Line.
2. route is single-phase or the relay protecting method of two-phase broken string for identification according to claim 1, it is characterised in that: step
It is rapid d) described in circuit breaking criterion be to meet following 1. and/or 2. any one group of condition in three groups of operation conditions:
1. in a certain time interval, when route both ends have the electric current of the identical phase electric wire of the same name of a phase or two-phase to sport
Zero, the current break is that the current value that zero current transformer for being separately positioned on both ends monitors is less than has stream fixed suddenly
Value and such case are continued for not less than defined judgement time t；
2. the three-phase current that route both ends when coincidence is set, occur for one end switch of route, which is respectively less than, stream definite value, while occurring again
The imbalance of three-phase voltage value at the end is more than definite value and such case is continued until the defined judgement time, while the other end is opened
It closes and is also set in coincidence and occur that three-phase voltage has been all larger than pressure definite value and imbalance of three-phase voltage value is maximum no more than operating normally
Unbalance voltage definite value and such case determine the time as defined in being continued until.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610892866.7A CN106300254B (en) | 2016-10-13 | 2016-10-13 | Route is single-phase or the relay protecting method of two-phase broken string for a kind of identification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610892866.7A CN106300254B (en) | 2016-10-13 | 2016-10-13 | Route is single-phase or the relay protecting method of two-phase broken string for a kind of identification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106300254A CN106300254A (en) | 2017-01-04 |
| CN106300254B true CN106300254B (en) | 2019-02-15 |
Family
ID=57716942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610892866.7A Active CN106300254B (en) | 2016-10-13 | 2016-10-13 | Route is single-phase or the relay protecting method of two-phase broken string for a kind of identification |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106300254B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997019A (en) * | 2017-05-17 | 2017-08-01 | 国家电网公司 | A kind of monitoring method for earth-free power system single-phase wire break |
| CN107394755A (en) * | 2017-06-30 | 2017-11-24 | 南京南瑞继保电气有限公司 | A kind of guard method for avoiding the unordered action of transmission line of electricity broken string |
| CN108459233B (en) * | 2018-03-27 | 2024-01-19 | 深圳供电局有限公司 | Equivalent circuit of main transformer high-voltage two-phase disconnection fault and identification method |
| CN110082644B (en) * | 2019-05-23 | 2022-03-15 | 国电南瑞科技股份有限公司 | Relay protection circuit CT disconnection identification method and power transmission line fault location method |
| CN110531178B (en) * | 2019-09-24 | 2021-11-12 | 深圳市英威腾电动汽车驱动技术有限公司 | Three-phase unbalance detection method and system for electric vehicle driving motor coil |
| CN111562523B (en) * | 2020-04-08 | 2023-01-17 | 中国电力科学研究院有限公司 | Disconnection distinguishing method and system suitable for 3/2 connection protection mutual inductor |
| CN111614065B (en) * | 2020-05-07 | 2022-03-29 | 国网四川省电力公司 | Line disconnection protection method based on line parameter identification |
| CN114252734B (en) * | 2021-12-21 | 2023-07-07 | 国网江苏省电力有限公司镇江供电分公司 | 220kV tie line single-phase disconnection monitoring and distinguishing method |
| CN115117841B (en) * | 2022-05-13 | 2023-03-21 | 北京天能继保电力科技有限公司 | Protection method and device for line breaking fault |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452041A (en) * | 2008-12-26 | 2009-06-10 | 湖北省电力试验研究院 | Electrical power distribution network single-phase earth fault type and phase distinguishing method |
| CN101741070A (en) * | 2010-01-11 | 2010-06-16 | 山东大学 | Method for pilot protection of circuit based on current capacity and voltage capacity at two ends |
| CN202533545U (en) * | 2012-04-13 | 2012-11-14 | 常熟皇朝信息科技有限公司 | Power transmission network fault detection system based on internet of things technology |
| CN203422438U (en) * | 2013-07-19 | 2014-02-05 | 国家电网公司 | Real-time monitoring and fault location system for overhead lines of power distribution network |
| CN104330979A (en) * | 2014-10-31 | 2015-02-04 | 国家电网公司 | Analog simulation system of complex power distribution network |
| CN104578008A (en) * | 2015-01-12 | 2015-04-29 | 西安交通大学 | Zero-sequence direction element maloperation prevention method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3409694B2 (en) * | 1998-05-08 | 2003-05-26 | 三菱電機株式会社 | Directional short-circuit relay |
-
2016
- 2016-10-13 CN CN201610892866.7A patent/CN106300254B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452041A (en) * | 2008-12-26 | 2009-06-10 | 湖北省电力试验研究院 | Electrical power distribution network single-phase earth fault type and phase distinguishing method |
| CN101741070A (en) * | 2010-01-11 | 2010-06-16 | 山东大学 | Method for pilot protection of circuit based on current capacity and voltage capacity at two ends |
| CN202533545U (en) * | 2012-04-13 | 2012-11-14 | 常熟皇朝信息科技有限公司 | Power transmission network fault detection system based on internet of things technology |
| CN203422438U (en) * | 2013-07-19 | 2014-02-05 | 国家电网公司 | Real-time monitoring and fault location system for overhead lines of power distribution network |
| CN104330979A (en) * | 2014-10-31 | 2015-02-04 | 国家电网公司 | Analog simulation system of complex power distribution network |
| CN104578008A (en) * | 2015-01-12 | 2015-04-29 | 西安交通大学 | Zero-sequence direction element maloperation prevention method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106300254A (en) | 2017-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106300254B (en) | Route is single-phase or the relay protecting method of two-phase broken string for a kind of identification | |
| CN111373622A (en) | Nested microgrid control system | |
| KR100709980B1 (en) | Method and apparatus for detecting a fault section using comparison of phase difference and magnitude difference bewteen zero phase currents in ungrounded distribution power systems | |
| RU2469342C1 (en) | Method and apparatus for controlling secondary circuit measuring transformer in electric power system | |
| CN105765812B (en) | Method for the electric fault in detection circuit | |
| CN109564257A (en) | The fault detection and protection carried out during stable state using traveling wave | |
| EP2862252B1 (en) | A power bay protection device and a method for protecting power bays | |
| CN102246374B (en) | Method and safety device for monitoring a bus bar of an electrical energy supply grid | |
| CN101803136A (en) | Differential protection method, system and device | |
| CN109061378A (en) | Small current neutral grounding system ground fault checks method | |
| JP5051225B2 (en) | Power distribution system, accident search / division method | |
| CN103517831B (en) | Dark current cutoff device and dark current cutting-off method | |
| CN109412107A (en) | Electronic state reports breaker | |
| CN202334004U (en) | State measurement and control device and system for protection pressing plate | |
| WO2009127817A1 (en) | Self organising unit protection | |
| CN111781465A (en) | Fault positioning system and method for ungrounded power grid | |
| CN106340954A (en) | Method for identifying line breaking of power supply line and switching to standby power supply | |
| US20060197383A1 (en) | Panel and breaker for distributing UPS power | |
| KR20210091141A (en) | Electrical protection system and method therefor | |
| ES2935693T3 (en) | Isolation and restoration of single-phase faults in a power distribution network | |
| KR101583255B1 (en) | Apparatus for signal information analysis of railroad crossing | |
| EP2651026B1 (en) | Automatic fault isolation methodology | |
| CN111781464A (en) | Fault positioning system and method for arc suppression coil and small-resistance grounding power grid | |
| RU2437193C1 (en) | Method, system and device of differential protection | |
| KR20180023661A (en) | Apparatus and method for managing power outage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |