CN106370972B - Master station-centralized small current grounding fault localization method based on capacitance load injection - Google Patents
Master station-centralized small current grounding fault localization method based on capacitance load injection Download PDFInfo
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The present invention relates to a kind of master station-centralized small current grounding fault localization methods based on capacitance load injection, and to small current grounding fault, a situation arises screens；Small current grounding fault occurs, injection capacitance load and certain time in the bus bar side non-faulting phase that substation occurs for failure；Distribution network systems main website is sent in each terminal installation point real-time current data or mutation current data after each line feed terminals inject capacitance load within the time of capacitance load injection；Current change quantity within the certain time-delay time before and after distribution network systems main website side is injected by analysis capacitance load determines the specific fault zone that failure occurs and to the isolation to small current grounding fault.The present invention provides that a kind of route is simple, high, the master station-centralized small current grounding fault localization method without injecting distinctive signal that determines accuracy, there is good adaptability and fault location reliability to current China's power distribution network small current grounding fault, have good promotional value.
Description
Technical field
The present invention relates to power distribution network small current grounding faults to determine field, specifically a kind of to be injected based on capacitance load
Master station-centralized small current grounding fault localization method.
Background technique
As intelligent distribution network reform strengthening is promoted to profundal zone, power supply reliability is improved as an important index quilt
It has write into state's net " 13 " action plan.Distribution feeder automation is to improve key technology and the side of power supply reliability
Method.In recent years, the feeder automation skill along with the upsurges of the distribution network automated construction of a few wheels, under domestic short circuit fault of power distribution network
Art has significant progress, effectively ensures the distribution network reliability under short-circuit conditions.
But power distribution network major part failure is singlephase earth fault, and in the power distribution network in China press earthing mode be mostly in
The small current neutral grounding mode of property point non_direct ground.Although small current neutral grounding mode can be by earth-fault current limit value smaller
Range, and can operate with failure 1-2 hours, but being grounded step voltage but often becomes the member for threatening personal safety
Act of violence, therefore quickly timely excision failure seems particularly necessary.
Current power distribution network small current neutral grounding localization method has two major classes, and one kind is passive method, and one kind is active technique.It is passive
Method is to analyze the big of failure generation by the situation of change of the transient-wave of each key point before and after analysis small current grounding fault
Body position.This kind of method is not necessarily to Injection Signal, fault verification only can be completed by particular sample terminal and main website cooperation, still
Due to distribution line complexity, interference waveform is more, and the accuracy determined is not high.Active technique is by injecting special letter in neutral point
Number signal is received by specific terminal installation and main website is cooperated to complete fault verification, this kind of method need to inject special letter
Number, and need that particular terminal is cooperated to receive distinctive signal, although being improved in reliability compared with passive method, on generalization
It is not good enough.
Therefore, it studies one kind and is suitable for current China's distribution network construction status, relied on without configuring a large amount of particular terminals
The synthesis small current grounding fault determination method for a large amount of conventional terminals built at present has important practical significance.
Summary of the invention
In view of the above-mentioned problems, present invention combination power distribution network feature, provide that a kind of route is simple, determines that accuracy is high, is not necessarily to
Inject the master station-centralized small current grounding fault localization method based on capacitance load injection of distinctive signal.
To solve the above problems, the technical scheme adopted by the invention is as follows: the master station-centralized based on capacitance load injection is small
Current earthing Fault Locating Method, includes the following steps:
Step 1: to small current grounding fault, a situation arises screens；
Step 2: being infused in the bus bar side non-faulting phase that substation occurs for failure when determining that small current grounding fault occurs
Enter capacitance load, and certain time backed off after random capacitance load；
Step 3: each terminal peace after each line feed terminals inject capacitance load within the period of capacitance load injection
It decorates and is sent to distribution network systems main website in real-time current data and mutation current data；
Step 4: passing through the electric current in the certain time-delay time before and after analysis capacitance load injection in distribution network systems main website side
Variable quantity determines the specific fault zone that failure occurs；
Step 5: realizing the isolation to small current grounding fault by the boundary switch for disconnecting fault zone upstream.
Preferably, feelings are occurred to small current grounding fault using bus three-phase voltage and residual voltage variation in step 1
Condition is screened, specially following three kinds of situations:
(1) bus has two-phase voltage to increase close to line voltage, and has phase voltage reduction, and residual voltage is in 50-
When 110V, then it is assumed that singlephase earth fault occurs；
(2) it is more than line voltage that bus, which has a phase voltage to increase, and another two-phase voltage reduces, and residual voltage is in 50-
When 100V, it is believed that voltage transformer power frequency ferromagnetic resonance occurs；
(3) bus has a phase voltage close to 0, and another two-phase voltage is constant, and when residual voltage is near 33V, it is believed that
Voltage transformer fuse blows occur.
Capacitance load is injected in the bus bar side non-faulting phase that substation occurs for failure described in step 2, specific point three kinds
Situation injection:
(1) capacitance load is injected in faulted phase voltage lag phase；It at this time will in the fault point failure Xiang Zhongcong to power supply point
Additional capacitor electric current, due to the effect of phase angle, the failure phase load electric current after leading to additional capacitor electric current is up to minimum value.
(2) capacitance load is injected in faulted phase voltage leading phase；It at this time will in the fault point failure Xiang Zhongcong to power supply point
Additional capacitor electric current, due to the effect of phase angle, the failure phase load electric current after leading to additional capacitor electric current reaches maximum value.
(3) capacitance load is injected simultaneously in the two-phase of non-faulting phase, the fault point failure Xiang Zhongcong to power supply point will add
Capacitance current causes additional capacitor electric current to be cancelled out each other due to the effect of phase angle, so that failure phase load electric current be made to become smaller.
The injection of capacitance load, which is worked as, needs certain time, delay time to backed off after random capacitance load.
Line feed terminals described in step 3 include FTU, DTU, fault detector；
Wherein, in real time on send real-time current data to terminals such as FTU, DTU, the fault detectors of distribution network systems main website
Device, delay time can be set it is shorter, such as 200 milliseconds.
The delay time of fault detector for non real-time upper power transmission flow data to distribution network systems main website is set as 5 points
Clock；
For the terminal installations such as FTU, DTU, fault detector of the mutation current data to distribution network systems main website are above sent, it is delayed
Time can be set it is shorter, such as 1 second.
The specific fault zone that failure occurs, specific decision criteria are determined in step 4 are as follows:
(1) if the domain mutation current that enters in minimum fault verification region is not zero, and domain mutation current is 0 out, then is grounded event
Barrier occurs in the minimum fault verification region；
(2) if minimum fault verification region enter domain mutation current and domain mutation current is all not zero out, and enter domain and dash forward
Time-dependent current is equal to domain mutation current, then no ground failure occurs in the minimum fault verification region；
If 3) minimum fault verification region enter domain mutation current and domain mutation current is all zero out, the minimum failure
No ground failure occurs in determinating area.
The minimum fault verification region refers to that boundary is FTU, DTU and fault detector, and it is without interior nodes, Huo Zheqi
Interior nodes are all the connection system of T node, and the failure phase mutation current that the minimum fault verification region is flowed into before and after failure is known as
Enter domain mutation current, and the failure phase mutation current that the minimum fault verification region is flowed out before and after failure is known as domain mutation electricity
Stream, failure phase mutation current refer to that the variable quantity of two primary current of front and back is more than the electric current of certain value；
If flowing through the faulted phase current of minimum fault verification zone boundary terminal such as FTU, DTU and fault detector before failure
For I0, and the faulted phase current for minimum fault verification zone boundary terminal such as FTU, DTU and fault detector being flowed through after failure etc.
For I1, minimum fault verification zone boundary terminal fault phase mutation current is Itb, failure phase mutation current threshold values is IcThen:
Entering domain mutation current is Iin, domain mutation current I outoutFor
Wherein, IitbFor minimum fault verification region include it is each go out domain switch mutation current, wherein i=0,1,2 ...
N, n are the domain switch number out that minimum fault verification region includes；
If minimum fault verification regional determination logic is AfaultIf AfaultSmall current grounding fault is indicated for 0
In minimum fault verification region, and non-zero indicates that failure does not occur in the minimum fault verification region:
To there are two the principles of the isolation of small current grounding fault in step 5, one is by Fault Isolation in smallest region
Domain, the other is isolated fault in the shortest time, so the specific method is as follows:
(1) if the boundary switch in minimum fault verification region is all three distant switches, when having distant control function, then xegregating unit
It is each minimum fault verification zone boundary switch that can be remotely controlled；
(2) if the boundary switch part in minimum fault verification region is three distant switches, part does not have distant control function, then every
To expand from range, the switch that there is distant control function in upstream need to be expanded to；
(3) if minimum fault verification region enters domain switch and its upstream switch all without distant control function, remote control power transformation is needed
Wire-outgoing breaker of standing trips isolated fault, and scene be isolated minimum fault verification region enter domain switch, it is rear to be remotely controlled power transformation outlet
Breaker closing power transmission realizes the minimum isolation of small current grounding fault.
Advantageous effects of the present invention: the present invention provides a kind of simple route, judgement accuracy height, without injecting special letter
Number based on capacitance load injection master station-centralized small current grounding fault localization method.This method is to current China's power distribution network
Small current grounding fault has good adaptability and fault location reliability, has good promotional value.
Specific embodiment
Based on the master station-centralized small current grounding fault localization method of capacitance load injection, include the following steps:
Step 1: using bus three-phase voltage and residual voltage variation, to small current grounding fault, a situation arises discriminates
Not；Specially following three kinds of situations:
(1) bus has two-phase voltage voltage to increase close to line voltage, and has phase voltage reduction, and residual voltage exists
When 50-110V, then it is assumed that singlephase earth fault occurs；
(2) it is more than line voltage that bus, which has a phase voltage to increase, and another two-phase voltage reduces, and residual voltage is in 50-
When 100V, it is believed that voltage transformer power frequency ferromagnetic resonance occurs；
(3) bus has a phase voltage close to 0, and another two-phase voltage is constant, and when residual voltage is near 33V, it is believed that
Voltage transformer fuse blows occur.
Step 2: being infused in the bus bar side non-faulting phase that substation occurs for failure when determining that small current grounding fault occurs
Enter capacitance load, specific point of three kinds of situation injections:
(1) capacitance load is injected in faulted phase voltage lag phase；
(2) capacitance load is injected in faulted phase voltage leading phase；
(3) capacitance load is injected simultaneously in the two-phase of non-faulting phase；
Inject capacitance load certain time backed off after random capacitance load；
Step 3: each line feed terminals such as FTU, DTU, fault detector within the period of capacitance load injection, it will be electric
Distribution network systems main website is sent in each terminal installation point real-time current data and mutation current data after holding load injection；Wherein,
The delay time for sending real-time current data to FTU, DTU of distribution network systems main website, fault detector in real time is set as 200 in the least
Second；
The delay time of fault detector of the non real-time upper power transmission flow data to distribution network systems main website is set as 5 minutes；
On send mutation current data to FTU, DTU of distribution network systems main website, fault detector delay time be set as 1 second
Clock.
Step 4: passing through the electric current in the certain time-delay time before and after analysis capacitance load injection in distribution network systems main website side
Variable quantity determines the specific fault zone that failure occurs, specific decision criteria are as follows:
(1) if the domain mutation current that enters in minimum fault verification region is not zero, and domain mutation current is 0 out, then is grounded event
Barrier occurs in the minimum fault verification region；
(2) if minimum fault verification region enter domain mutation current and domain mutation current is all not zero out, and enter domain and dash forward
Time-dependent current is equal to domain mutation current, then no ground failure occurs in the minimum fault verification region；
(3) if minimum fault verification region enter domain mutation current and domain mutation current is all zero out, the minimum is former
Hinder no ground failure in determinating area to occur.
The minimum fault verification region refers to that boundary is FTU, DTU and fault detector, and it is without interior nodes, Huo Zheqi
Interior nodes are all the connection system of T node, and the failure phase mutation current that the minimum fault verification region is flowed into before and after failure is known as
Enter domain mutation current, and the failure phase mutation current that the minimum fault verification region is flowed out before and after failure is known as domain mutation electricity
Stream, failure phase mutation current refer to that the variable quantity of two primary current of front and back is more than the electric current of certain value；
If flowing through the faulted phase current of minimum fault verification zone boundary terminal such as FTU, DTU and fault detector before failure
For I0, and the faulted phase current for minimum fault verification zone boundary terminal such as FTU, DTU and fault detector being flowed through after failure etc.
For I1, minimum fault verification zone boundary terminal fault phase mutation current is Itb, failure phase mutation current threshold values is IcThen:
Entering domain mutation current is Iin, domain mutation current I outoutFor
Wherein, IitbFor minimum fault verification region include it is each go out domain switch mutation current, wherein i=0,1,2 ...
N, n are the domain switch number out that minimum fault verification region includes；
If minimum fault verification regional determination logic is AfaultIf AfaultIndicate that small current grounding fault occurs most for 0
Glitch determinating area, and non-zero indicates that failure does not occur in the minimum fault verification region:
Step 5: realizing the isolation to small current grounding fault by the boundary switch for disconnecting fault zone upstream.
To there are two the principles of the isolation of small current grounding fault, one is by Fault Isolation in Minimum Area, another
It is isolated fault in the shortest time, so the specific method is as follows:
(1) if the boundary switch in minimum fault verification region is all three distant switches, when having distant control function, then xegregating unit
It is each minimum fault verification zone boundary switch that can be remotely controlled；
(2) if the boundary switch part in minimum fault verification region is three distant switches, part does not have distant control function, then every
To expand from range, the switch that there is distant control function in upstream need to be expanded to；
(3) if minimum fault verification region enters domain switch and its upstream switch all without distant control function, remote control power transformation is needed
Wire-outgoing breaker of standing trips isolated fault, and scene be isolated minimum fault verification region enter domain switch, it is rear to be remotely controlled power transformation outlet
Breaker closing power transmission realizes the minimum isolation of small current grounding fault.
Claims (7)
1. the master station-centralized small current grounding fault localization method based on capacitance load injection, it is characterised in that including walking as follows
It is rapid:
Step 1: to small current grounding fault, a situation arises screens；
Step 2: injecting electricity in the bus bar side non-faulting phase that substation occurs for failure when determining that small current grounding fault occurs
Hold load, and certain time backed off after random capacitance load；
Step 3: after each line feed terminals with function of measuring inject capacitance load within the period of capacitance load injection
Distribution network systems main website is sent in each terminal installation point real-time current data and mutation current data；
Step 4: passing through the curent change in the certain time-delay time before and after analysis capacitance load injection in distribution network systems main website side
Amount determines the specific fault zone that failure occurs；
Step 5: realizing the isolation to small current grounding fault by the boundary switch for disconnecting fault zone upstream.
2. the master station-centralized small current grounding fault localization method according to claim 1 based on capacitance load injection,
It is characterized by: in step 1 using bus three-phase voltage and residual voltage variation come to small current grounding fault a situation arises into
Row is screened, specially following three kinds of situations:
(1) bus has two-phase voltage voltage to increase close to line voltage, and has phase voltage reduction, and residual voltage is in 50-
When 110V, then it is assumed that singlephase earth fault occurs；
(2) it is more than line voltage that bus, which has a phase voltage to increase, and another two-phase voltage reduces, and residual voltage is in 50-100V,
Think that voltage transformer power frequency ferromagnetic resonance occurs；
(3) bus has a phase voltage close to 0, and another two-phase voltage is constant, and when residual voltage is near 33V, it is believed that occurs
Voltage transformer fuse blows.
3. the master station-centralized small current grounding fault localization method according to claim 1 based on capacitance load injection,
It is characterized by: capacitance load is injected in the bus bar side non-faulting phase that substation occurs for failure described in step 2, specific point
Three kinds of situation injections:
(1) capacitance load is injected in faulted phase voltage lag phase；
(2) capacitance load is injected in faulted phase voltage leading phase；
(3) capacitance load is injected simultaneously in the two-phase of non-faulting phase.
4. the master station-centralized small current grounding fault localization method according to claim 1 based on capacitance load injection,
It is characterized by: the line feed terminals described in step 3 with function of measuring include FTU, DTU, fault detector；
Wherein, in real time on send real-time current data to FTU, DTU of distribution network systems main website, fault detector delay time be arranged
It is 200 milliseconds；
The delay time of fault detector of the non real-time upper power transmission flow data to distribution network systems main website is set as 5 minutes；
On send mutation current data to FTU, DTU of distribution network systems main website, fault detector delay time be set as 1 second.
5. the master station-centralized small current grounding fault localization method according to claim 4 based on capacitance load injection,
It is characterized in that: determining the specific fault zone that failure occurs, specific decision criteria in step 4 are as follows:
(1) if the domain mutation current that enters in minimum fault verification region is not zero, and domain mutation current is 0 out, then ground fault is sent out
Life is in the minimum fault verification region；
(2) if minimum fault verification region enter domain mutation current and domain mutation current is all not zero out, and it is electric to enter domain mutation
Stream is equal to domain mutation current, then no ground failure occurs in the minimum fault verification region.
6. the master station-centralized small current grounding fault localization method according to claim 5 based on capacitance load injection,
Be characterized in that: the minimum fault verification region refers to that boundary is FTU, DTU and fault detector, and it is without interior nodes, or
Its interior nodes is all the connection system of T node, and the failure phase mutation current that the minimum fault verification region is flowed into before and after failure claims
To enter domain mutation current, and the failure phase mutation current that the minimum fault verification region is flowed out before and after failure is known as domain mutation electricity
Stream, failure phase mutation current refer to that the variable quantity of two primary current of front and back is more than the electric current of certain value；
If the faulted phase current for flowing through minimum fault verification zone boundary terminal such as FTU, DTU and fault detector before failure is I0,
And the faulted phase current for minimum fault verification zone boundary terminal such as FTU, DTU and fault detector being flowed through after failure etc. is I1,
Minimum fault verification zone boundary terminal fault phase mutation current is Itb, failure phase mutation current threshold values is IcThen:
Entering domain mutation current is Iin, domain mutation current I outoutFor
Wherein, IitbFor minimum fault verification region include it is each go out domain switch mutation current, wherein i=0,1,2 ... n, n
Go out domain switch number for what minimum fault verification region included；
If minimum fault verification regional determination logic is AfaultIf AfaultIndicate that small current grounding fault occurs in minimum event for 0
Hinder determinating area, and non-zero indicates that failure does not occur in the minimum fault verification region:
7. the master station-centralized small current grounding fault localization method according to claim 6 based on capacitance load injection,
Be characterized in that: to there are two the principles of the isolation of small current grounding fault in step 5, one is by Fault Isolation in smallest region
Domain, the other is isolated fault in the shortest time, so the specific method is as follows:
(1) if the boundary switch in minimum fault verification region is all three distant switches, when having distant control function, then xegregating unit is
Each minimum fault verification zone boundary switch that can be remotely controlled；
(2) if the boundary switch part in minimum fault verification region is three distant switches, part does not have distant control function, then model is isolated
Enclosing will expand, and need to be expanded to the switch that there is distant control function in upstream；
(3) if minimum fault verification region enters domain switch and its upstream switch all without distant control function, remote control substation is needed to go out
Line circuit breaker trip isolated fault, and scene be isolated minimum fault verification region enter domain switch, it is rear to be remotely controlled power transformation outlet open circuit
Device combined floodgate power transmission realizes the minimum isolation of small current grounding fault.
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| CN106990325B (en) * | 2017-04-14 | 2019-08-23 | 积成电子股份有限公司 | Distribution small current grounding fault determination method based on mutation logic array |
| CN111579941B (en) * | 2020-05-11 | 2021-05-18 | 西南交通大学 | Online steel rail insulation defect diagnosis method based on all-line steel rail potential feature extraction |
| CN112485603A (en) * | 2020-12-17 | 2021-03-12 | 国网辽宁省电力有限公司铁岭供电公司 | Small current grounding fault positioning and alarming method based on fault indicator |
| CN113608069B (en) * | 2021-07-30 | 2022-05-20 | 西安交通大学 | Direct-current power distribution network ground fault identification method and system of MMC injected detection signal |
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