CN106908694B - A kind of distribution line failure indicator and its detection method based on IEC61850 - Google Patents
A kind of distribution line failure indicator and its detection method based on IEC61850 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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
A kind of distribution line failure indicator based on IEC61850, its main feature is that, it is respectively provided in each phase of aerial three-phase line and is connected with fault detector, three fault detectors establish communication connection using 6LoWPAN agreement ad hoc network mode, and real-time collected current information and breakdown judge message are sent to the fault detector of A phase line connection as fault comprehensive criterion by the fault detector of B, C two-phase connection；The fault detector of A phase line connection is built-in with Beidou RDSS communication module; short message can be forwarded to the system main website in substation with Beidou satellite system; fault message is organized into IEC61850 standard Goose message to be sent in substation network; simultaneity factor main website has the function of monitoring smart grid relay protection action message message; extraction and analysis message content simultaneously cooperates the information that all fault detectors are sent back on line related, judges fault section.And provide its detection method.
Description
Technical field
The invention belongs to system for distribution network of power relay protection fields, and in particular to a kind of distribution wire based on IEC61850
Line fault indicator and its detection method.
Background technique
The probability to break down in 6~66kV power distribution network in China is relatively high, and is largely answered at the scene in recent years
Fault detector can allow operations staff quickly to search the location of faults such as power distribution network short circuit, ground connection, and it is reliable to improve power supply
Property.Currently, Some Domestic producer is proposed the fault detector with communication function, operations staff can further be greatly decreased
Workload.Short-distance wireless communication module, communicates with communication terminal special built in this kind of fault detector, and communication terminal connection moves
Dynamic internet, uploads main website for fault message.Communication terminal power supply uses battery or solar panels, is mounted on distance fault and refers to
Show the closer position of device (such as in tower bar).It is existing this kind fault detector the problem is that: itself not remote nothing
Line communication function needs to be transmitted to main website by communication terminal；The power supply storage battery of communication terminal is difficult in maintenance, solar panels are pacified
It fills cumbersome and is influenced by dust and rainy weather；Tower bar installment work intensity in communication terminal open air is big and in rain-proof dust-proof vibrationproof
Lightning protection etc. requires high；Communication terminal uses public network, is unfavorable for the Network Communicate Security of power grid；Indicating fault
Device, communication terminal, system main website establish one's own system, and are free on except electric system, are unfavorable for the construction of smart grid.Therefore, existing
The mode of some this kind " fault detector+communication terminal " manufacturing cost, installation cost, maintenance in the application of power industry
Cost is all higher.
Summary of the invention
In order to solve the deficiencies in the prior art, it is an object of the present invention to provide a kind of structurally reasonable, practical function is good, at
This low, distribution line failure indicator easy to use based on IEC61850, and its detection method is provided,
Realize the object of the invention the technical solution adopted is that, a kind of distribution line based on IEC61850 provided by the invention
Fault detector is characterized in that it includes that a system main website is equipped in each distribution substation, with substation's triple line
The middle section of the three-phase long transmission line of road connection and several groups three-phase line component inlet be equipped with and with three-phase long transmission line, several
The fault detector of group three-phase line magnetic connects, each fault detector, the every three-phase line of three-phase long transmission line connection connect
Each fault detector is connect with Beidou satellite system and handheld communication devices signal；Each failure of three-phase long transmission line connection
6LoWPAN protocol communication is used between indicator, is led between the fault detector of every three-phase line connection using 6LoWPAN agreement
Letter, wherein the fault detector that fault detector, the C phase long transmission line of three-phase long transmission line B phase long transmission line connection connect is by data
Send the fault detector of A phase long transmission line connection to, the Beidou RDSS built in the fault detector of A phase long transmission line connection communicates mould
Signal is forwarded short message to the system main website in substation by block via Beidou satellite system, is used after system main website examination processing
IEC61850 communication protocol is transmitted to power communication net；Fault detector, the C phase line of the B phase line connection of every three-phase line
The fault detector of connection transfers data to the fault detector of A phase line connection, the indicating fault of A phase line connection
Beidou RDSS communication module built in device by signal via Beidou satellite system forwarding short message to the system main website in substation,
Power communication net is transmitted to IEC61850 communication protocol after system main website examination processing；System main website is able to use built-in
Beidou RDSS communication module actively sends short message data to all fault detectors by Beidou satellite system；Handheld communication
Equipment is communicated with fault detector nearby using 6LoWPAN agreement, and parameter is arranged, and reads data.
A kind of detection method of distribution line failure indicator based on IEC61850 provided by the invention, including following step
It is rapid:
1) the S1 stage of system initialization: system main website being installed in substation, upper electricity operation, then with power telecom network
Network connection, with any computer, that is, settable system main website running parameter: each three-phase line title, Beidou communication terminal address,
Each three-phase line running current threshold value, each three-phase line work normally zero-sequence current threshold value, then, with substation's three-phase
The middle section of the three-phase long transmission line of connection and several groups three-phase line branch inlet be in each three-phase line exit of substation,
The middle section of three-phase long transmission line, three-phase line component inlet are equipped with and the fault detector with respective three-phase line magnetic connects,
A fault detector is often installed, needs that its parameter: working line title, the work of three-phase line is arranged with handheld communication devices
The Beidou communication terminal address for making phase title, system main website after the A phase line that three-phase line is arranged, reads three-phase current,
Zero-sequence current sees whether this group of fault indicator is normal, and whole fault detectors install with system master station communication state
After finishing and working normally, into the S2 stage；
2) handle the S2 stage of telemetering remote regulating information: system main website is logical using IEC61850 agreement and arbitrary network terminal
Letter, receives telemetering remote regulating request of data, requests if any telemetering, then by the given line of Beidou satellite system and three-phase line
The communication of specified fault detector, extract each current data under synchronised clock, the information such as working condition return to requesting party, such as
There is remote regulating request, then pass through specified its running parameter of fault detector communications setting on Beidou satellite system and given line,
Into the S3 stage；
3) the S3 stage of processing terminal heartbeat message: system main website receives the minimum interval 10 of every group of fault detector transmission
Second, the 60 seconds heartbeat message messages in longest interval, fault detector needs to report in heartbeat message this group of three-phase line difference
Whether communicated between three fault detectors of connection normally, whether zero-sequence current is normal, the event of the system main website comprehensive descision group
Whether barrier indicator is in normal operating conditions, if there is a problem it will send terminal fault message to network, waits network whole
Query processing is held, into the S4 stage；
4) whether receive the S4 stage of relay protection movement message: it is logical that electric power is monitored on backstage always after working on power by system main website
Goose message in communication network, identifies type of message in this stage, if receiving the short trouble message of line related, again
Combined floodgate failure message or system single-phase earthing message then enter the S5 stage, otherwise return to the S2 stage；
5) be phase fault the S5 stage: in this stage, if what system main website was listened to from power telecom network
Fault type is phase fault, then extracts line name parameter, accident generation moment, then export from substation line
The fault detector of place's installation starts, by installation site from closely to remote sequence, through Beidou satellite system on the route
The data of fault detector group each 5 cycles before and after successively requesting accident that the moment occurs, if the three-phase current of upper one group of passback
Data are mutated increase after the accident moment, and the three-phase current data of next group of passback are mutated reduction after the accident moment, then judge
The section between two groups of fault detectors is exactly fault section out, sends fault section message to network, and pass through third party
Communications service quotient sends short message to the mobile phone set and reminds, and network terminal query processing is waited, into the S6 stage；
6) be singlephase earth fault the S6 stage: if the fault type that system main website is listened to from power telecom network is single
Phase ground fault, then the fault detector group mass-sending request zero sequence immediately by Beidou satellite system on all line relateds is electric
The message of flow data, in the data of return, by line name by fault detector zero-sequence current data packet inspection, according to away from
From substation from closely to remote sequential search, if larger with a zero-sequence current upper in group, and next zero-sequence current is smaller,
Then judge that the section between two groups of fault detectors is exactly fault section, sends fault section message to network, and pass through
Three-Part protocol service provider sends short message to the mobile phone set and reminds, and waits network terminal query processing, returns to S2 rank
Section.
The advantages of distribution line failure indicator and its detection method provided by the invention based on IEC61850, is embodied in:
1) it is linked with big-dipper satellite, realizes round-the-clock, accessible real time communication；
2) IEC61850 communication protocol is used, is seamlessly connected with smart grid；
3) guarantee without tripping, no malfunction；
4) do not have a power failure installation, debugging, without providing power supply；
5) SMS can be sent to assigned work personnel, it is indicated that fault section；
6) especially suitable for meagrely-populated, the not covered area of public radio communication net is used；
7) structurally reasonable, practical function is good, at low cost, easy to use.
Detailed description of the invention
Fig. 1 is the distribution line failure indicator structure schematic diagram provided by the invention based on IEC61850；
Fig. 2 is the distribution line failure pointer detection method flow diagram provided by the invention based on IEC61850.
Specific embodiment
Distribution line failure instruction to provided by the invention based on IEC61850 in the following with reference to the drawings and specific embodiments
Device and its detection method are described in detail.
As shown in Figure 1, the distribution line failure indicator provided by the invention based on IEC61850, is included in each distribution
One system main website 1 is installed, middle section and several groups in the three-phase long transmission line connecting with substation three-phase line in substation
Three-phase line component inlet is equipped with and the fault detector 2 with three-phase long transmission line, several groups three-phase line magnetic connects, and three
Each fault detector 2 of phase long transmission line connection, the connection of every three-phase line each fault detector 2 and Beidou satellite system
3 connect with 4 signal of handheld communication devices；It is logical using 6LoWPAN agreement between each fault detector 2 of three-phase long transmission line connection
Believe, uses 6LoWPAN protocol communication between the fault detector 2 of every three-phase line connection, wherein the long line of three-phase long transmission line B phase
The fault detector 2 of road connection, the fault detector 2 of C phase long transmission line connection transfer data to the event of A phase long transmission line connection
Hinder indicator 2, the Beidou RDSS communication module built in the fault detector 2 of A phase long transmission line connection is by signal via big-dipper satellite
System 3 forwards short message to the system main website 1 in substation, uses IEC61850 communication protocol after 1 examination of system main website processing
It is transmitted to power communication net；The fault detector that fault detector 2, the C phase line of the B phase line connection of every three-phase line connect
2 transfer data to the fault detector 2 of A phase line connection, the Beidou built in the fault detector 2 of A phase line connection
Signal is forwarded short message to the system main website 1 in substation by RDSS communication module via Beidou satellite system 3, through system main website
Power communication net is transmitted to IEC61850 communication protocol after 1 examination processing；System main website 1 is able to use built-in Beidou RDSS
Communication module sends short message data to all fault detectors 2 by 3 active of Beidou satellite system；Handheld communication devices 4
It is communicated nearby with fault detector 2 using 6LoWPAN agreement, parameter is set, read data.It is described i.e.: the substation
Three-phase line, several groups three-phase line refer to A phase line, B phase line and C phase line；Three-phase long transmission line refers to that A phase is grown
Route, B phase long transmission line and C phase long transmission line.
The detection method of distribution line failure indicator provided by the invention based on IEC61850, comprising the following steps:
1) the S1 stage of system initialization: system main website being installed in substation, upper electricity operation, then with power telecom network
Network connection, with any computer, that is, settable system main website running parameter: each three-phase line title, Beidou communication terminal address,
Each three-phase line running current threshold value, each three-phase line work normally zero-sequence current threshold value, then, with substation's three-phase
The middle section of the three-phase long transmission line of connection and several groups three-phase line branch inlet be in each three-phase line exit of substation,
The middle section of three-phase long transmission line, three-phase line component inlet are equipped with and the fault detector with respective three-phase line magnetic connects,
A fault detector is often installed, needs that its parameter: working line title, the work of three-phase line is arranged with handheld communication devices
The Beidou communication terminal address for making phase title, system main website after the A phase line that three-phase line is arranged, reads three-phase current,
Zero-sequence current sees whether this group of fault indicator is normal, and whole fault detectors install with system master station communication state
After finishing and working normally, into the S2 stage；
2) handle the S2 stage of telemetering remote regulating information: system main website is logical using IEC61850 agreement and arbitrary network terminal
Letter, receives telemetering remote regulating request of data, requests if any telemetering, then by the given line of Beidou satellite system and three-phase line
The communication of specified fault detector, extract each current data under synchronised clock, the information such as working condition return to requesting party, such as
There is remote regulating request, then pass through specified its running parameter of fault detector communications setting on Beidou satellite system and given line,
Into the S3 stage；
3) the S3 stage of processing terminal heartbeat message: system main website receives the minimum interval 10 of every group of fault detector transmission
Second, the 60 seconds heartbeat message messages in longest interval, fault detector needs to report in heartbeat message this group of three-phase line difference
Whether communicated between three fault detectors of connection normally, whether zero-sequence current is normal, the event of the system main website comprehensive descision group
Whether barrier indicator is in normal operating conditions, if there is a problem it will send terminal fault message to network, waits network whole
Query processing is held, into the S4 stage；
4) whether receive the S4 stage of relay protection movement message: it is logical that electric power is monitored on backstage always after working on power by system main website
Goose message in communication network, identifies type of message in this stage, if receiving the short trouble message of line related, again
Combined floodgate failure message or system single-phase earthing message then enter the S5 stage, otherwise return to the S2 stage；
5) be phase fault the S5 stage: in this stage, if what system main website was listened to from power telecom network
Fault type is phase fault, then extracts line name parameter, accident generation moment, then export from substation line
The fault detector of place's installation starts, by installation site from closely to remote sequence, through Beidou satellite system on the route
The data of fault detector group each 5 cycles before and after successively requesting accident that the moment occurs, if the three-phase current of upper one group of passback
Data are mutated increase after the accident moment, and the three-phase current data of next group of passback are mutated reduction after the accident moment, then judge
The section between two groups of fault detectors is exactly fault section out, sends fault section message to network, and pass through third party
Communications service quotient sends short message to the mobile phone set and reminds, and network terminal query processing is waited, into the S6 stage；
6) be singlephase earth fault the S6 stage: if the fault type that system main website is listened to from power telecom network is single
Phase ground fault, then the fault detector group mass-sending request zero sequence immediately by Beidou satellite system on all line relateds is electric
The message of flow data, in the data of return, by line name by fault detector zero-sequence current data packet inspection, according to away from
From substation from closely to remote sequential search, if larger with a zero-sequence current upper in group, and next zero-sequence current is smaller,
Then judge that the section between two groups of fault detectors is exactly fault section, sends fault section message to network, and pass through
Three-Part protocol service provider sends short message to the mobile phone set and reminds, and waits network terminal query processing, returns to S2 rank
Section.
Distribution line failure indicator provided by the invention based on IEC61850, it includes triplets, three-phase line
A phase line, respectively install one on B phase line and C phase line, three fault detectors 2 using low-power consumption 6LoWPAN agreement
Ad hoc network mode establishes communication connection.The fault detector 2 that B phase line, C phase line connect will real-time collected current information
And breakdown judge message be sent to A phase line connection fault detector 2, A phase line connection fault detector 2 built in
6LoWPAN IP Edge router will be used as fault comprehensive criterion after whole three-phase information collections.The failure of A phase line connection
Indicator 2 is also built-in with Beidou RDSS communication module, short message can be forwarded to being mounted in substation with Beidou satellite system
System main website 1, in this way without designed for connection wireless public network communication terminal.Overhead type fault detector 2 of the invention
Electricity is directly taken with CT using itself measurement, inside is equipped with the continuity that super capacitor guarantees equipment power supply, does not need external power supply
Power supply, electrification installation do not need to be laid with communication cable, do not need the data collector installed on column without any connecting terminal
Or communication terminal.System main website 1 by built-in Beidou RDSS communication module receive and dispatch failure on relevant distribution line refer to
Show 2 short message of device, sends the Goose message that necessary information is organized into IEC61850 standard in substation network, notice fortune
Administrative staff and daemon software.System main website 1 has the function of receiving smart grid relay protection action message message simultaneously, extract
Analysis message content simultaneously cooperates the information that all fault detectors 2 are sent back on line related, judges fault section.
Claims (1)
1. a kind of detection method of the distribution line failure indicator based on IEC61850, it includes in each distribution substation
One system main website is installed, in the middle section for the three-phase long transmission line connecting with substation three-phase line and several groups three-phase line point
Branch inlet is equipped with and the fault detector with three-phase long transmission line, several groups three-phase line magnetic connects, the connection of three-phase long transmission line
Each fault detector, every three-phase line connection each fault detector with Beidou satellite system and handheld communication devices
Signal connection；6LoWPAN protocol communication, every three-phase line connection are used between each fault detector of three-phase long transmission line connection
Fault detector between use 6LoWPAN protocol communication, wherein three-phase long transmission line B phase long transmission line connection fault detector,
The fault detector of C phase long transmission line connection transfers data to the fault detector of A phase long transmission line connection, and A phase long transmission line connects
Signal is forwarded short message to substation by the Beidou RDSS communication module built in the fault detector connect via Beidou satellite system
In system main website, with IEC61850 communication protocol be transmitted to power communication net after system main website examination processing；Every triple line
The fault detector of the B phase line connection on road, the fault detector of C phase line connection transfer data to the connection of A phase line
Fault detector, A phase line connection fault detector built in Beidou RDSS communication module by signal via big-dipper satellite
System forwards short message is transmitted after system main website examination processing with IEC61850 communication protocol to the system main website in substation
To power communication net；System main website is able to use built-in Beidou RDSS communication module by Beidou satellite system actively to all
Fault detector send short message data；Handheld communication devices are communicated with fault detector nearby using 6LoWPAN agreement, if
Parameter is set, data are read,
It is characterized in that, further comprising the steps of:
1) the S1 stage of system initialization: system main website being installed in substation, upper electricity operation, then is connected with powerline network
It is logical, with any computer, that is, settable system main website running parameter: each three-phase line title, Beidou communication terminal address, each three
Phase line running current threshold value, each three-phase line work normally zero-sequence current threshold value, then, with substation's three-phase line
The middle section of the three-phase long transmission line of connection and several groups three-phase line branch inlet are in each three-phase line exit of substation, three-phase
The middle section of long transmission line, three-phase line component inlet are equipped with and the fault detector with respective three-phase line magnetic connects, every peace
A fault detector is installed, needs that its parameter: working line title, the work phase of three-phase line is arranged with handheld communication devices
The Beidou communication terminal address of title, system main website after the A phase line that three-phase line is arranged, reads three-phase current, zero sequence
Electric current sees whether this group of fault indicator is normal, and whole fault detectors install simultaneously with system master station communication state
After normal work, into the S2 stage；
2) handle the S2 stage of telemetering remote regulating information: system main website is communicated using IEC61850 agreement with arbitrary network terminal, is connect
It by telemetering remote regulating request of data, is requested if any telemetering, then passes through the finger on the given line of Beidou satellite system and three-phase line
Determine fault detector communication, each current data, work state information under extraction synchronised clock return to requesting party, if any remote regulating
Request, then by specified its running parameter of fault detector communications setting on Beidou satellite system and given line, into S3
Stage；
3) the S3 stage of processing terminal heartbeat message: system main website receives the minimum interval 10 seconds of every group of fault detector transmission,
The 60 seconds heartbeat message messages in longest interval, fault detector need to report that in heartbeat message, this group of three-phase line is separately connected
Three fault detectors between whether communicate normal, whether zero-sequence current normal, and system main website this group of failure of comprehensive descision refers to
Show whether device is in normal operating conditions, if there is a problem it will send terminal fault message to network, the network terminal is waited to look into
Inquiry processing, into the S4 stage；
4) whether receive the S4 stage of relay protection movement message: power telecom network is monitored on backstage always after working on power by system main website
Goose message in network, identifies type of message in this stage, if receiving short trouble message, the reclosing of line related
Failure message or system single-phase earthing message then enter the S5 stage, otherwise return to the S2 stage；
5) be phase fault the S5 stage: in this stage, if the failure that system main website is listened to from power telecom network
Type is phase fault, then extracts line name parameter, accident generation moment, then pacify from substation line exit
The fault detector of dress starts, by installation site from closely to remote sequence, passing through failure of the Beidou satellite system on the route
The data of indicator group each 5 cycles before and after successively requesting accident that the moment occurs, if the three-phase current data of upper one group of passback
It is mutated and increases after the accident moment, the three-phase current data of next group of passback are mutated reduction after the accident moment, then judge this
Section between two groups of fault detectors is exactly fault section, sends fault section message to network, and pass through Three-Part protocol
Service provider sends short message to the mobile phone set and reminds, and network terminal query processing is waited, into the S6 stage；
6) be singlephase earth fault the S6 stage: if the fault type that system main website is listened to from power telecom network is single-phase connects
Earth fault, then zero-sequence current number is requested in the fault detector group mass-sending immediately by Beidou satellite system on all line relateds
According to message, by line name by fault detector zero-sequence current data packet inspection, become according to distance in the data of return
Power station is from closely to remote sequential search, if larger with a zero-sequence current upper in group, and next zero-sequence current is smaller, then sentences
Section between disconnected two groups of fault detectors out is exactly fault section, sends fault section message to network, and pass through third
Square Communications service quotient sends short message to the mobile phone set and reminds, and waits network terminal query processing, returns to the S2 stage.
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| CN110889959B (en) * | 2019-11-28 | 2021-09-21 | 国网山东省电力公司蓬莱市供电公司 | Beidou distribution network communication system and Beidou distribution network communication method |
| CN113220493A (en) * | 2020-02-04 | 2021-08-06 | 北京京东尚科信息技术有限公司 | Fault data processing method and device, storage medium and electronic equipment |
| CN112782530A (en) * | 2021-01-18 | 2021-05-11 | 珠海安瑞通电子科技有限公司 | Fault indicator for line real-time fault judgment and control method and equipment thereof |
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| CN202330621U (en) * | 2011-11-29 | 2012-07-11 | 长沙威胜信息技术有限公司 | Fault positioning system of power distribution circuit |
| CN103592566A (en) * | 2013-09-02 | 2014-02-19 | 北京交通大学 | Wireless communication based power distribution network distributed online monitoring and fault positioning system |
| CN104914347A (en) * | 2015-05-20 | 2015-09-16 | 广西电网有限责任公司桂林供电局 | Grounding fault judgment method based on time axis comparison of Beidou satellite time service |
| CN205691715U (en) * | 2016-06-06 | 2016-11-16 | 国网冀北电力有限公司张家口供电公司 | Power distribution network distributed on line monitoring based on radio communication and fault location system |
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| US9917436B2 (en) * | 2007-10-30 | 2018-03-13 | General Electric Company | System and method for control of power distribution |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202330621U (en) * | 2011-11-29 | 2012-07-11 | 长沙威胜信息技术有限公司 | Fault positioning system of power distribution circuit |
| CN103592566A (en) * | 2013-09-02 | 2014-02-19 | 北京交通大学 | Wireless communication based power distribution network distributed online monitoring and fault positioning system |
| CN104914347A (en) * | 2015-05-20 | 2015-09-16 | 广西电网有限责任公司桂林供电局 | Grounding fault judgment method based on time axis comparison of Beidou satellite time service |
| CN205691715U (en) * | 2016-06-06 | 2016-11-16 | 国网冀北电力有限公司张家口供电公司 | Power distribution network distributed on line monitoring based on radio communication and fault location system |
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