CN106300254A - A kind of relay protecting method identifying the single-phase or biphase broken string of circuit - Google Patents
A kind of relay protecting method identifying the single-phase or biphase broken string of circuit Download PDFInfo
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- CN106300254A CN106300254A CN201610892866.7A CN201610892866A CN106300254A CN 106300254 A CN106300254 A CN 106300254A CN 201610892866 A CN201610892866 A CN 201610892866A CN 106300254 A CN106300254 A CN 106300254A
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- 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
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- 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
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- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of relay protecting method identifying the single-phase or biphase broken string of circuit, including starting and the protective relaying device at initiating line two ends；Protective relaying device carries out self-inspection, it may be judged whether normal, normal after, gather position signalling and circuit two ends electric current, the information of voltage of circuit two ends switch；The information collected is compared with line disconnection failure criterion, if signal is normal, returns；If meeting line disconnection failure criterion, open-circuit line switchs, and terminates this process.The present invention carries out the collection of data by existing device, realize the differentiation of circuit breaking, it is thus possible to electric current, the voltage condition of three-phase electricity is analyzed accurately and is differentiated, and can find line disconnection failure in time, and the mode taking open-circuit line to switch prevents line disconnection failure from electrical equipment and electrical network are produced harm.The present invention has filled up the blank not carrying out the relay protecting method protected for circuit breaking.
Description
Technical field
The present invention relates to circuit relay protection technical field, particularly relate to a kind of circuit single-phase or biphase broken string of identifying
Relay protecting method.
Background technology
At present, due to line disconnection failure the most all along with line-to-ground, the relay protection dress current to earth fault
Put and can accurately be identified, and disconnection fault occurrence probability purely is the lowest, simultaneously relatively small to grid equipment harm,
Therefore, currently without the method identifying the purely single-phase or biphase broken string of circuit.But, the single-phase or biphase broken string of circuit is to a lot
Electrical equipment can produce bigger harm, also can generation harmful effect properly functioning to electrical network, owing to three-phase broken string can cause line
Road is fully disconnected, it is impossible to continue power supply, similar with disconnecting switching effect, has at present and effectively tackles means, it is not necessary to opens specially
The method sending out new, and need and be specifically designed for the relay protecting method of the single-phase or biphase disconnection fault of circuit to overcome this blind area
Defect.
Summary of the invention
It is an object of the invention to provide a kind of relay protecting method identifying the single-phase or biphase broken string of circuit, it is possible to online
There is to disconnect during single-phase or biphase disconnection fault line related switch in road, thus avoids the harm that line disconnection failure produces,
Infringement that protection electrical network and electrical equipment are not caused by disconnection fault, damage.
The technical solution used in the present invention is:
A kind of relay protecting method identifying the single-phase or biphase broken string of circuit, including following several steps:
If lower step:
A) protective relaying device at also initiating line two ends, is started；Enter step b)；
Device, equipment needed for using the method specifically include that circuit itself, are installed in the switch at circuit two ends, and installing is online
The circuit relay protection device at two ends, road, is installed in circuit two ends and provides the electricity of two ends current information for circuit relay protection device
Current transformer, provide the voltage transformer of both end voltage information, information communication line that circuit two ends are mutually transmitted and equipment, with
And the link circuit etc. between each unit；
B), protective relaying device carries out self-inspection, it may be judged whether normal, if so, enters step c)；If it is not, return step b), concurrently
Go out alarm signal；
C) position signalling and circuit two ends electric current, the information of voltage of circuit two ends switch, are gathered；Enter step d)
D) information, by step c) collected is compared with line disconnection failure criterion, if signal is normal, returns step
C)；If meeting line disconnection failure criterion, enter step e)；
E), open-circuit line switch；Enter step f)；
F) this process, is terminated；Deng circuit recover properly functioning after, automatically begin to monitor lower secondary line single-phase or biphase disconnected
Line.
Circuit breaking criterion described in step d) is to meet any one group of bar in following 1.-2. three group operation condition
Part:
The most in a certain time interval, the electric current of a phase or biphase of the same name identical phase electric wire is had all to sport when circuit two ends
Zero, described current break is that the current value that zero current transformer being i.e. separately positioned on two ends monitors is fixed less than there being stream suddenly
Value and this situation are continued for being not less than the judgement time t of regulation；
2. circuit one end switch is when closing position, occurs the three-phase current at circuit two ends respectively less than to have stream definite value, occurs again simultaneously
The imbalance of three-phase voltage value of this end exceedes definite value and this situation is continued until judgement time of regulation, and the other end is opened simultaneously
Close and also closing position and occurring that three-phase voltage has been all higher than compression set value and imbalance of three-phase voltage value is not more than properly functioning maximum
Unbalance voltage definite value and this situation are continued until the judgement time of regulation.
The present invention carries out the collection of data by existing device, and when line current is bigger, (two ends three-phase current is the most not
Less than there being stream definite value) meet the arbitrary phase current in one end simultaneously and be zero (this phase current is less than there being stream definite value) and receive another by using
One end is zero with famous prime minister without stream information and one end three-phase current and receives other end three-phase and come real with famous prime minister without the negative of stream information
An existing phase or the differentiation of biphase circuit breaking；One end three-phase current is zero and receives other end three-phase with famous prime minister without stream information simultaneously
Also sentence for the circuit breaking logic when line current less (two ends three-phase current respectively less than has stream definite value) as Rule of judgment
Disconnected, when line current is less, by using two end switch all closing position, and one end three-phase current is zero and receives the other end
Three-phase is with famous prime minister without stream information, and normally (three-phase voltage has been all higher than compression set value and three-phase voltage to circuit one end three-phase voltage simultaneously
Unbalanced value is not more than properly functioning maximum unbalance voltage definite value, it may be assumed that setting) other end imbalance of three-phase voltage value is more than
Properly functioning maximum unbalance voltage definite value, it may be assumed that setting, it is achieved the differentiation of circuit breaking such that it is able to the electricity to three-phase electricity
Stream, voltage condition are analyzed accurately and differentiate, and can find line disconnection failure in time, and taking open-circuit line to switch
Mode prevent line disconnection failure from electrical equipment and electrical network are produced harm.The present invention has filled up and has not entered for circuit breaking
The blank of the relay protecting method of row protection.
Accompanying drawing explanation
The flow chart of Fig. 1 present invention；
Fig. 2 is total logic chart of the single-phase or biphase disconnection fault criterion of heretofore described circuit；
Fig. 3 is the logic chart of the single-phase or biphase disconnection fault criterion of circuit of heretofore described circuit M end.
Fig. 4 is the logic chart of the single-phase or biphase disconnection fault criterion of circuit of heretofore described circuit N end.
Detailed description of the invention
As illustrated in fig. 1 and 2, a kind of relay protecting method identifying the single-phase or biphase broken string of circuit, wherein: if including
Lower step:
A), start and initiating line two ends use this method (one can identify power circuit broken string relay protecting method)
Protective relaying device；Enter step b)；
Use the connected mode between device, equipment and the relevant device device needed for the method and existing longitudinal differential protection system
Completely the same, specifically include that circuit itself, be installed in circuit two ends (convenient for statement, referred to as M end, N end, lower with) open
Close, be installed in the circuit relay protection device at circuit two ends, be installed in circuit two ends and provide two ends for circuit relay protection device
The current transformer of current information, the voltage transformer of offer both end voltage information, the information communication that circuit two ends are mutually transmitted
Link circuit etc. between circuit and equipment, and each unit, these are completely the same with prior art, no longer describe in detail.
B), self-check of device whether normal, if so, enter step c)；If it is not, return step b)；
C), circuit two ends switch position signal and circuit two ends electric current, information of voltage are gathered；Enter step d)
D), these information being compared with line disconnection failure criterion, if meeting, entering step e)；If signal is normal,
Return step c)；
Circuit breaking criterion described in step d) is as follows:
Meet the arbitrary set condition in following three groups of operation conditions: 1. circuit two ends (M end and N end) has a phase or biphase of the same name
Time identical, (in a certain time interval) current break is zero (i.e.: suddenly less than there being stream definite value) and this situation are continued until
The judgement time of regulation；2. circuit M end switch is when closing position, occurs circuit two ends (M end and N end) three-phase current respectively less than to have
Stream definite value, occurs the most again M end imbalance of three-phase voltage value to exceed definite value and time this situation is continued until the judgement of regulation simultaneously
Between, N end switch is closing position and is occurring that N end three-phase voltage has been all higher than compression set value and imbalance of three-phase voltage is just being not more than simultaneously
Often the maximum unbalance voltage definite value of operation and this situation are continued until the judgement time of regulation.3. circuit N end switch exists
When closing position, occur circuit two ends (M end and N end) three-phase current respectively less than to have stream definite value, N end three-phase voltage occurs not the most again
Balance exceedes definite value and this situation is continued until judgement time of regulation, and M end switch is closing position and M end three occurring simultaneously
Phase voltage has been all higher than compression set value and imbalance of three-phase voltage is not more than properly functioning maximum unbalance voltage definite value and this
Situation is continued until the judgement time of regulation.
For in the 1. set condition " circuit two ends (M end and N end) have a phase or biphase of the same name identical time (in a timing
Between in interval) current break be zero (i.e.: suddenly less than there being stream definite value) " differentiation, have employed and meet circuit two ends three-phase simultaneously
In any one phase current of the same name less than have stream definite value and circuit two ends three-phase phase current of the same name both less than have stream definite value negative this
The logic of two set conditions realize " circuit two ends (M end and N end) have a phase or biphase of the same name identical time (between certain time
Every interior) current break be zero (i.e.: suddenly less than there being stream definite value) " differentiation.Three-phase phase current of the same name in circuit two ends is the least simultaneously
In have stream this logical consequence of definite value also as Rule of judgment for the logical judgment that 2. 3. group and the is organized.
E), open-circuit line switch；Enter step f)；
F) this process, is terminated.Deng circuit recover properly functioning after, automatically begin to monitor lower secondary line single-phase or biphase disconnected
Line.
It is installed in the two ends of circuit owing to the present invention relates to the protective relaying device of circuit, is necessary for this method during concrete control
Decomposing and implement to concrete two ends, remember that wherein one end is M end, the other end is N end, then the logic after this method decomposes M end
As follows:
Detect that M end has a phase or biphase current to sport zero, send M end without flowing separate information until electric current is more than to N end
In there being stream definite value, as received at the appointed time, the identical separate phase current that N end is sent sports the information of zero, and
In the time delay of regulation, M client information is constant and can persistently receive N end with famous prime minister without stream information, meets criterion.Or, receive
After having a phase or biphase current to sport the information of zero to N end, detect that M end has identical separate phase current at the appointed time
Sport zero, send M end without flowing separate information until electric current is more than or equal to there being stream definite value to N end, as in the time delay of regulation, M
Client information is constant and can persistently receive N end with famous prime minister without stream information, is i.e. judged to meet criterion.
Circuit M end switch, when closing position, occurs circuit two ends three-phase current respectively less than to have stream definite value, M occurs again simultaneously
End imbalance of three-phase voltage exceedes setting the most lasting (until aforementioned condition occurs when any one is unsatisfactory for) to be permitted to the transmission of N end
Permitted signal (or stopping paying out block signal), the most persistently receive N and allow signal (or block signal disappearance) and this situation one
Directly last till the judgement time of regulation, be i.e. judged to meet criterion.
Circuit M end switch, when closing position, occurs circuit two ends three-phase current respectively less than to have stream definite value, and M end three occurs
Phase voltage has been all higher than compression set value and imbalance of three-phase voltage is not more than properly functioning maximum unbalance voltage definite value, holds the most again
Continued access receives N and allows signal (or block signal disappearance) just to continue (until aforementioned condition occurs when any one is unsatisfactory for) to N end
Send and allow signal (or stopping paying out block signal), and this situation is held the judgement time of regulation always, be i.e. judged to meet and sentence
Other condition.
Logic chart such as Fig. 3.
The 1. in set condition, uses and meets the arbitrary phase current of M end simultaneously and sport zero and receive N end with famous prime minister without stream letter
Breath and M end three-phase current sport zero and receive N end three-phase and realize a phase or biphase sentencing with famous prime minister without the negative of stream information
Not, M end three-phase current sports zero and receives N end three-phase with famous prime minister without stream information also as Rule of judgment for 2. simultaneously
The logical judgment that 3. group and the is organized.
Logic after this method decomposes N end is as follows:
Detect that N end has a phase or biphase current to sport zero, send N end without flowing separate information until electric current is more than to M end
In there being stream definite value, as received at the appointed time, the identical separate phase current that M end is sent sports the information of zero, and
In the time delay of regulation, N client information is constant and can persistently receive M end with famous prime minister without stream information, meets criterion.Or, receive
After having a phase or biphase current to sport the information of zero to M end, detect that M end has identical separate phase current at the appointed time
Sport zero, send N end without flowing separate information until electric current is more than or equal to there being stream definite value to M end, as in the time delay of regulation, N
Client information is constant and can persistently receive M end with famous prime minister without stream information, is i.e. judged to meet criterion.
Circuit N end switch, when closing position, occurs circuit two ends three-phase current respectively less than to have stream definite value, N occurs again simultaneously
End imbalance of three-phase voltage exceedes definite value the most lasting (until aforementioned condition occurs when any one is unsatisfactory for) and allows to the transmission of M end
Signal (or stopping paying out block signal), the most persistently receives M permission signal (or block signal disappearance) and this situation is always
Last till the judgement time of regulation, be i.e. judged to meet criterion.
Circuit N end switch, when closing position, occurs circuit two ends three-phase current respectively less than to have stream definite value, and N end three occurs
Phase voltage has been all higher than compression set value and imbalance of three-phase voltage is not more than properly functioning maximum unbalance voltage definite value, holds the most again
Continued access receives M and allows signal (or block signal disappearance) just to continue (until aforementioned condition occurs when any one is unsatisfactory for) to M end
Send and allow signal (or stopping paying out block signal), and this situation is held the judgement time of regulation always, be i.e. judged to meet and sentence
Other condition.
Logic chart such as Fig. 4.
The 1. in set condition, uses and meets the arbitrary phase current of N end simultaneously and sport zero and receive M end with famous prime minister without stream letter
Breath and N end three-phase current sport zero and receive M end three-phase and realize a phase or biphase sentencing with famous prime minister without the negative of stream information
Not, N end three-phase current sports zero and receives M end three-phase with famous prime minister without stream information also as Rule of judgment for 2. simultaneously
The logical judgment that 3. group and the is organized.
The present invention can monitor existing electrical network in real time and power, and existing electrical network electrical equipment is carried out power supply monitoring, accurately distinguishes electricity
Whole grid cut-off and broken string single-phase or biphase to supply line when source powers, and all can carry out standby when power-off occurs
Use power switchover control, thus avoid power circuit to break the harm that electrical equipment can be produced, it is to avoid the accident of equipment damage
Generation.
Claims (2)
1. the relay protecting method identifying the single-phase or biphase broken string of circuit, it is characterised in that: include following several step:
If lower step:
A) protective relaying device at also initiating line two ends, is started；Enter step b)；
Device, equipment needed for using the method specifically include that circuit itself, are installed in the switch at circuit two ends, and installing is online
The circuit relay protection device at two ends, road, is installed in circuit two ends and provides the electricity of two ends current information for circuit relay protection device
Current transformer, provide the voltage transformer of both end voltage information, information communication line that circuit two ends are mutually transmitted and equipment, with
And the link circuit etc. between each unit；
B), protective relaying device carries out self-inspection, it may be judged whether normal, if so, enters step c)；If it is not, return step b), concurrently
Go out alarm signal；
C) position signalling and circuit two ends electric current, the information of voltage of circuit two ends switch, are gathered；Enter step d)
D) information, by step c) collected is compared with line disconnection failure criterion, if signal is normal, returns step
C)；If meeting line disconnection failure criterion, enter step e)；
E), open-circuit line switch；Enter step f)；
F) this process, is terminated；Deng circuit recover properly functioning after, automatically begin to monitor lower secondary line single-phase or biphase disconnected
Line.
The relay protecting method of the single-phase or biphase broken string of identification circuit the most according to claim 1, it is characterised in that: step
Circuit breaking criterion described in d) is to meet any one set condition in following 1.-2. three group operation condition:
The most in a certain time interval, the electric current of a phase or biphase of the same name identical phase electric wire is had all to sport when circuit two ends
Zero, described current break is that the current value that zero current transformer being i.e. separately positioned on two ends monitors is fixed less than there being stream suddenly
Value and this situation are continued for being not less than the judgement time t of regulation；
2. circuit one end switch is when closing position, occurs the three-phase current at circuit two ends respectively less than to have stream definite value, occurs again simultaneously
The imbalance of three-phase voltage value of this end exceedes definite value and this situation is continued until judgement time of regulation, and the other end is opened simultaneously
Close and also closing position and occurring that three-phase voltage has been all higher than compression set value and imbalance of three-phase voltage value is not more than properly functioning maximum
Unbalance voltage definite value and this situation are continued until the judgement time of regulation.
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 true CN106300254A (en) | 2017-01-04 |
| CN106300254B CN106300254B (en) | 2019-02-15 |
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| 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 |
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Cited By (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 |
| CN108459233A (en) * | 2018-03-27 | 2018-08-28 | 深圳供电局有限公司 | Equivalent circuit for two-phase disconnection fault of main transformer and identification method |
| CN110082644A (en) * | 2019-05-23 | 2019-08-02 | 国电南瑞科技股份有限公司 | Relay protection circuit CT broken string recognition methods and fault positioning method for transmission line |
| CN110531178A (en) * | 2019-09-24 | 2019-12-03 | 深圳市英威腾电动汽车驱动技术有限公司 | A kind of the three-phase imbalance detection method and system of driving motor for electric automobile coil |
| CN111562523A (en) * | 2020-04-08 | 2020-08-21 | 中国电力科学研究院有限公司 | Disconnection distinguishing method and system of protection transformer suitable for 3/2 wiring |
| CN111614065A (en) * | 2020-05-07 | 2020-09-01 | 国网四川省电力公司 | Line disconnection protection method based on line parameter identification |
| CN114252734A (en) * | 2021-12-21 | 2022-03-29 | 国网江苏省电力有限公司镇江供电分公司 | 220kV tie line single-phase broken line monitoring and distinguishing method |
| CN115117841A (en) * | 2022-05-13 | 2022-09-27 | 北京天能继保电力科技有限公司 | Protection method and device for line breaking fault |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| CN110082644A (en) * | 2019-05-23 | 2019-08-02 | 国电南瑞科技股份有限公司 | Relay protection circuit CT broken string recognition methods and fault positioning method for transmission line |
| 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 |
| CN110531178A (en) * | 2019-09-24 | 2019-12-03 | 深圳市英威腾电动汽车驱动技术有限公司 | A kind of the three-phase imbalance detection method and system of driving motor for electric automobile coil |
| 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 |
| CN111562523A (en) * | 2020-04-08 | 2020-08-21 | 中国电力科学研究院有限公司 | Disconnection distinguishing method and system of protection transformer suitable for 3/2 wiring |
| CN111614065A (en) * | 2020-05-07 | 2020-09-01 | 国网四川省电力公司 | Line disconnection protection method based on line parameter identification |
| 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 |
| CN114252734A (en) * | 2021-12-21 | 2022-03-29 | 国网江苏省电力有限公司镇江供电分公司 | 220kV tie line single-phase broken line monitoring and distinguishing method |
| 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 |
| CN115117841A (en) * | 2022-05-13 | 2022-09-27 | 北京天能继保电力科技有限公司 | Protection method and device for line breaking fault |
| 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 |
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| CN106300254B (en) | 2019-02-15 |
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