CN106506237A - A kind of Fault Locating Method of substation communication network and device - Google Patents

A kind of Fault Locating Method of substation communication network and device Download PDF

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Publication number
CN106506237A
CN106506237A CN201611123446.9A CN201611123446A CN106506237A CN 106506237 A CN106506237 A CN 106506237A CN 201611123446 A CN201611123446 A CN 201611123446A CN 106506237 A CN106506237 A CN 106506237A
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matrix
communication network
message
network
substation communication
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CN106506237B (en
Inventor
张延旭
胡春潮
冯善强
李书杰
黄曙
曹丽娟
侯艾君
汪溢
张晓悦
陈振晓
杨桂盛
张清松
段宏达
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance or administration or management of packet switching networks
    • H04L41/06Arrangements for maintenance or administration or management of packet switching networks involving management of faults or events or alarms
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/02Details
    • H04B3/46Monitoring; Testing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance or administration or management of packet switching networks
    • H04L41/06Arrangements for maintenance or administration or management of packet switching networks involving management of faults or events or alarms
    • H04L41/0631Alarm or event or notifications correlation; Root cause analysis
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance or administration or management of packet switching networks
    • H04L41/06Arrangements for maintenance or administration or management of packet switching networks involving management of faults or events or alarms
    • H04L41/0677Arrangements for maintenance or administration or management of packet switching networks involving management of faults or events or alarms localization of fault position

Abstract

A kind of Fault Locating Method of substation communication network and device is embodiments provided, its technical problem that position occurs cannot be analyzed for solving existing network message analyser.Present invention method includes:Network connection matrix is obtained according to the topology information of intelligent substation communication network, topological sum message transmissions mode according to intelligent substation communication network obtains the transmission path of each link packet and forms corresponding message transmissions path matrix, by the maximum element of numerical value in the fault location matrix in the first formula calculating first formula and determine in corresponding network there is location of fault according to the network connection matrix and the message transmissions path matrix, solve existing network message analyser and cannot analyze its technical problem that position occurs.

Description

A kind of Fault Locating Method of substation communication network and device
Technical field
A kind of the present invention relates to communication network failure positioning field, more particularly to fault location side of substation communication network Method and device.
Background technology
Under intelligent substation technology mode, exchange network instead of complicated cable connection in conventional substation, significantly The capability of information sharing between station equipment is improved, is to realize the more protection control strategy of advanced intelligent and more efficient Operation and maintenance system framework provides favourable basis.The operation and maintenance system of complete set has been defined in conventional substation, but still There are many O&M difficult problems, if there is the failures such as cable connection broken string, cause secondary information transmission to be obstructed, need by complexity The line inspection work can just find out failure.The networking of intelligent substation increased more uncertainties to information transfer, and mesh The front method for searching these failures but still follows conventional lines the thinking of transformer station, and this aspect is in the knowledge that should be grasped (such as net Network topological sum message distribution subscription relation etc.) and fault location empirically put forward higher requirement to operations staff;The opposing party Face, the accuracy and efficiency of man-made fault positioning also are difficult to ensure, bring to secondary system of intelligent substation safe and reliable operation Huge challenge.
Network message analyser has become the standard configuration equipment of secondary system of intelligent substation, is to carry out substation communication network The important auxiliary tool of fault diagnosis.The major function of network message analyser is by collecting and parsing all reports in network Text realizes message accounting with critical functions such as analysis, network flow monitoring, message abnormal examination and alarms.
The presence or absence of failure and exception can be analyzed based on network message analyser, but its occurrence cause and position cannot be analyzed Put.It can be seen that, the function of current network message analysis instrument be only limitted to network in exception and failure alert, but final failure The analysis of investigation and reason be intended to be completed by operations staff.But the data volume of NA displayings is inherently huge and mixes, especially Which is a large amount of bursts that NA shows when there is device port or link failure causes information transfer to interrupt this class catastrophe failure Warning information can allow operations staff to have no way of doing it so that fault diagnosis and analysis process are too dependent on producer and operations staff Field experience, bring huge challenge to secondary system of intelligent substation safe and reliable operation.
Therefore, it is that those skilled in the art need to solve that existing network message analyser cannot analyze which to occur position Technical problem.
Content of the invention
A kind of Fault Locating Method of substation communication network and device is embodiments provided, existing for solving Network message analyser cannot analyze its occur position technical problem.
The embodiment of the present invention provides a kind of Fault Locating Method of substation communication network, including:
S1:Network connection matrix is obtained according to the topology information of intelligent substation communication network, logical according to intelligent substation The topological sum message transmissions mode of communication network obtains the transmission path of each link packet and forms corresponding message transmissions path square Battle array;
S2:Described first is calculated according to the network connection matrix and the message transmissions path matrix by the first formula The maximum element of numerical value determine in corresponding network there is location of fault in fault location matrix in formula;
First formula is:
Wherein, Km×mFor intermediary matrix, Cm×mFor the network connection matrix, Dm×mFor the message transmissions path matrix, Gm×mFor the fault location matrix, quantity of the m for intelligent substation communication network middle port, p are the message chain that alarm occurs Road, n are the message link having in communication network.
Preferably, also include after step S1:
MMS warning information in communication network is monitored by network message analyser, is obtained according to the MMS warning information There is the message link of alarm.
Preferably, also include before step S1:
Real-time reception simultaneously parses the MMS warning information in communication network, if including MMS messages in the MMS warning information Chain rupture warning information, then enter step S1.
Preferably, step S2 is specifically included:
It is public described first to be calculated according to the network connection matrix and the message transmissions path matrix by the first formula Fault location matrix in formula;
It is g according to maximum element in fault location matrixijIf i-j correspond to physical connection, illustrate that failure occurs On optical fiber between port i or j or two port, if i-j correspond to logic connection, illustrate that failure is present in the logic connection On corresponding switch.
Preferably, described according to the topology information of intelligent substation communication network obtain network connection matrix be specially:Net Network connection matrix Cm×mSpecifically for describing the correspondence between substation communication network port, obtained by below equation:
Wherein,
The annexation mainly has two kinds:Physical connection and logic connecting relation, wherein, the physical connection between port is closed Owner will pass through the physical medias such as optical fiber and set up, and logic connecting relation is mainly built to the exchange control logic of message by switch Vertical.
Preferably, the topological sum message transmissions mode according to intelligent substation communication network obtains each link packet Transmission path is simultaneously formed corresponding message transmissions path matrix and is specially:If a link packet is from port a to the transmission of port b Path is Pa-b={ a-c, c-b }, then define a message transmissions path square according to the transmission path and below equation of this message Battle array Dm×m
Wherein,
The embodiment of the present invention provides a kind of fault locator of substation communication network, based on a kind of above-mentioned transformer station The Fault Locating Method of communication network is positioned, including:
Matrix acquisition module, for obtaining network connection matrix, root according to the topology information of intelligent substation communication network The transmission path of each link packet is obtained according to the topological sum message transmissions mode of intelligent substation communication network and is formed corresponding Message transmissions path matrix;
Formula computing module, for public by first according to the network connection matrix and the message transmissions path matrix Formula calculates in the fault location matrix in first formula maximum element of numerical value and determines in corresponding network there is failure Position.
Preferably, a kind of fault locator of substation communication network provided in an embodiment of the present invention also includes:
Warning message link acquisition module, for monitoring the MMS alarm letters in communication network by network message analyser Breath, obtains the message link that alarm occurs according to the MMS warning information.
Preferably, a kind of fault locator of substation communication network provided in an embodiment of the present invention also includes:
Real-time monitoring module, for real-time reception and parses the MMS warning information in communication network, if MMS alarms Include MMS message chain rupture warning information in information, then execute matrix acquisition module.
Preferably, the formula computing module is specifically included:
Matrix calculation unit, for public by first according to the network connection matrix and the message transmissions path matrix Formula calculates the fault location matrix in first formula;
Location determination unit, for being g according to maximum element in fault location matrixijIf i-j correspond to physics company Connect, then explanation failure occurs on the optical fiber between port i or j or two port, if i-j correspond to logic connection, illustrate Failure is present in the logic and connects on corresponding switch.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below:
The embodiment of the present invention obtains network connection matrix according to the topology information of intelligent substation communication network, according to intelligence The topological sum message transmissions mode of substation communication network obtains the transmission path of each link packet and forms corresponding message and passes Defeated path matrix, calculates described first according to the network connection matrix and the message transmissions path matrix by the first formula The maximum element of numerical value determine in corresponding network there is location of fault in fault location matrix in formula, solve existing Some network message analysers cannot analyze the technical problem which occurs position.
Additionally, present invention method realizes communication network also by the MMS warning information in real-time monitoring communication network The real-time monitoring of network.
Present invention method fault location scope has enough degree of accuracy, and operation maintenance personnel can be instructed to quickly find Abort situation, the normal operation of fast quick-recovery substation communication network greatly improve the O&M efficiency of intelligent substation, and improve The operational reliability of secondary system of intelligent substation.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is a kind of one embodiment of the Fault Locating Method of substation communication network provided in an embodiment of the present invention Schematic diagram;
Fig. 2 is a kind of another embodiment of the Fault Locating Method of substation communication network provided in an embodiment of the present invention Schematic diagram;
Fig. 3 is a kind of one embodiment of the fault locator of substation communication network provided in an embodiment of the present invention Schematic diagram;
Fig. 4 is an a kind of application examples of the Fault Locating Method of substation communication network provided in an embodiment of the present invention Schematic diagram.
Specific embodiment
A kind of Fault Locating Method of substation communication network and device is embodiments provided, existing for solving Network message analyser cannot analyze its occur position technical problem.
For enabling the goal of the invention of the present invention, feature, advantage more obvious and understandable, below in conjunction with the present invention Accompanying drawing in embodiment, to the embodiment of the present invention in technical scheme be clearly and completely described, it is clear that disclosed below Embodiment be only a part of embodiment of the invention, and not all embodiment.Embodiment in based on the present invention, this area All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention Scope.
Fig. 1 is referred to, the embodiment of the present invention provides an a kind of enforcement of Fault Locating Method of substation communication network Example, including:
101:Network connection matrix is obtained according to the topology information of intelligent substation communication network, logical according to intelligent substation The topological sum message transmissions mode of communication network obtains the transmission path of each link packet and forms corresponding message transmissions path square Battle array;
102:Described the is calculated according to the network connection matrix and the message transmissions path matrix by the first formula The maximum element of numerical value determine in corresponding network there is location of fault in fault location matrix in one formula;
First formula is:
Wherein, Km×mFor intermediary matrix, Cm×mFor the network connection matrix, Dm×mFor the message transmissions path matrix, Gm×mFor the fault location matrix, quantity of the m for intelligent substation communication network middle port, p are the message chain that alarm occurs Road, n are the message link having in communication network.
It is more than one to a kind of Fault Locating Method of substation communication network provided in an embodiment of the present invention to implement Example is described in detail, below by a kind of Fault Locating Method of substation communication network provided in an embodiment of the present invention Another embodiment is described in detail.
Fig. 2 is referred to, the embodiment of the present invention provides an a kind of enforcement of Fault Locating Method of substation communication network Example, including:
201:Real-time reception simultaneously parses the MMS warning information in communication network, if including MMS in the MMS warning information Message chain rupture warning information, then enter step 201.
202:Network connection matrix is obtained according to the topology information of intelligent substation communication network, logical according to intelligent substation The topological sum message transmissions mode of communication network obtains the transmission path of each link packet and forms corresponding message transmissions path square Battle array;
203:MMS warning information in communication network is monitored by network message analyser, according to the MMS warning information Obtain the message link that alarm occurs.
204:Described the is calculated according to the network connection matrix and the message transmissions path matrix by the first formula Fault location matrix in one formula;
205:It is g according to maximum element in fault location matrixijIf i-j correspond to physical connection, illustrate that failure is sent out On raw optical fiber between port i or j or two port, if i-j correspond to logic connection, illustrate that failure is present in the logic Connect on corresponding switch.
First formula is:
Wherein, Km×mFor intermediary matrix, Cm×mFor the network connection matrix, Dm×mFor the message transmissions path matrix, Gm×mFor the fault location matrix, quantity of the m for intelligent substation communication network middle port, p are the message chain that alarm occurs Road, n are the message link having in communication network.
Described according to the topology information of intelligent substation communication network obtain network connection matrix be specially:Network connection square Battle array Cm×mSpecifically for describing the correspondence between substation communication network port, obtained by below equation:
Wherein,
The annexation mainly has two kinds:Physical connection and logic connecting relation, wherein, the physical connection between port is closed Owner will pass through the physical medias such as optical fiber and set up, and logic connecting relation is mainly built to the exchange control logic of message by switch Vertical.
The topological sum message transmissions mode according to intelligent substation communication network obtains the transmission road of each link packet Footpath is simultaneously formed corresponding message transmissions path matrix and is specially:If one link packet from port a to the transmission path of port b is Pa-b={ a-c, c-b }, then define a message transmissions path matrix D according to the transmission path and below equation of this messagem×m
Wherein,
It is more than to a kind of another reality of the Fault Locating Method of substation communication network provided in an embodiment of the present invention Apply example to be described in detail, below by a kind of fault locator of substation communication network provided in an embodiment of the present invention One embodiment be described in detail.
Fig. 3 is referred to, the embodiment of the present invention provides an a kind of enforcement of fault locator of substation communication network Example, is positioned based on a kind of Fault Locating Method of above-mentioned substation communication network, including:
Matrix acquisition module 301, for obtaining network connection matrix according to the topology information of intelligent substation communication network, Topological sum message transmissions mode according to intelligent substation communication network obtains the transmission path of each link packet and is formed corresponding Message transmissions path matrix;
Formula computing module 302, for according to the network connection matrix and the message transmissions path matrix by the One formula calculates in the fault location matrix in first formula maximum element of numerical value and determines in corresponding network exist Location of fault.
A kind of fault locator of substation communication network provided in an embodiment of the present invention also includes:
Warning message link acquisition module 303, for monitoring the MMS alarms in communication network by network message analyser Information, obtains the message link that alarm occurs according to the MMS warning information.
A kind of fault locator of substation communication network provided in an embodiment of the present invention also includes:
Real-time monitoring module 304, for real-time reception and parses the MMS warning information in communication network, if the MMS is accused Include MMS message chain rupture warning information in alarming information, then execute matrix acquisition module 301.
The formula computing module 302 is specifically included:
Matrix calculation unit 401, for according to the network connection matrix and the message transmissions path matrix by the One formula calculates the fault location matrix in first formula;
Location determination unit 402, for being g according to maximum element in fault location matrixijIf i-j correspond to physics Connection, then, on optical fiber of the explanation failure generation between port i or j or two port, if i-j correspond to logic connection, say Bright failure is present in the logic and connects on corresponding switch.
It is more than one to a kind of fault locator of substation communication network provided in an embodiment of the present invention to implement Example is described in detail, below by a kind of Fault Locating Method of substation communication network provided in an embodiment of the present invention One application examples is described in detail.
Fig. 4 is referred to, of a kind of Fault Locating Method of substation communication network provided in an embodiment of the present invention should Use-case includes:
According to the topology information of intelligent substation communication network, the connection matrix C of communication network is formedm×m;
By the topological sum message transmissions mode of intelligent substation communication network, analysis obtains the transmission road of each link packet Footpath, forms corresponding message transmissions path matrix Dm×m
Then receive and parse the MMS warning information in communication network using network message analyser come the moment;
Once there is MMS message chain rupture warning information, then collect all messages that chain rupture occurs;
Fault diagnosis matrix G is calculated using the first formulam×m, and select its greatest measure element;
According to greatest measure unit, usually there is position in positioning failure.
1) substation communication network port connection relationship matrix
Define Matrix Cm×mTo describe the correspondence between substation communication network port, wherein m is that intelligent substation leads to The quantity of communication network middle port.
Wherein,
Here annexation mainly has two kinds:Physical connection and logic connecting relation, wherein, physical connection between port Relation is mainly set up by physical medias such as optical fiber, and logic connecting relation mainly passes through exchange control logic of the switch to message Set up.
2) definition of message transmissions path matrix
If one link packet is P from port a to the transmission path of port ba-b={ a-c, c-b }, then for this report The transmission path of text can define a message transmissions path matrix Dm×m
Wherein,
3) warning signal required for fault location
The realization of this method need using communication network in MMS warning information, MMS alert and be divided into two kinds of links Interrupt alarm and data abnormality alarming.
The link down alarm of intelligent substation communication network includes that SV links and GOOSE link downs alert two kinds, this One class fault warning is the most universal, affects also maximum on relay protection system, and reason is even more varied, such as exchange hardware event Barrier, port failure, fiber failure and switch forward mistake etc..When these failures occur, General Influence scope is larger, can Energy one Time Triggered multilink of meeting interrupts alarm, has a strong impact on the safe operation of protection system, at this moment needs operations staff's energy Enough analyze link down reason within a short period of time and provide fault location.Therefore, the event for carrying out for link down alarm Barrier diagnosis is the emphasis of this chapter researchs.
The data exception alarm of communication network includes SV sampled datas exception and GOOSE data exceptioies, and such as multicast MAC is different Often, APPID exceptions, quality position exception etc..The probability that error code occurs in a network in view of message is relatively low, if persistently there are data Abnormality alarming, that failure cause can determine the equipment itself for being present in message transmission, and without the need for excessively analyzing, therefore, data are different Often alarm is not this paper method for diagnosing faults emphasis of interest.
4) Fault Locating Method realizes formula
Consider that the probability that multiple failure occurs is very low, this method is set up and list only existed in intelligent substation communication network On the hypothesis basis of point.Generally when breaking down in communication network, often occur that multilink interrupts warning information.False Be located at synchronization, total p bar message links are alerted, in communication network, have n bar message links, then can be by the One formula is formula (1) positioning to network failure.Wherein matrix Gm×mIt is fault location matrix, Km×mIt is intermediary matrix.
After being calculated, fault location matrix Gm×mConnection corresponding to the maximum element of middle numerical value is in network There is location of fault.If maximum element is g in fault location matrixij, while i-j correspond to physical connection, then event is described Barrier occurs on the optical fiber between port i or j or two port.If i-j correspond to logic connection, illustrate that failure is present in this Logic connects on corresponding switch.
Those skilled in the art can be understood that, for convenience and simplicity of description, the system of foregoing description, Device and the specific work process of unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
The above, above example only in order to technical scheme to be described, rather than a limitation;Although with reference to front State embodiment to be described in detail the present invention, it will be understood by those within the art that:Which still can be to front State the technical scheme described in each embodiment to modify, or equivalent is carried out to which part technical characteristic;And these Modification is replaced, and does not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (10)

1. a kind of Fault Locating Method of substation communication network, it is characterised in that include:
S1:Network connection matrix is obtained according to the topology information of intelligent substation communication network, according to intelligent substation communication net The topological sum message transmissions mode of network obtains the transmission path of each link packet and forms corresponding message transmissions path matrix;
S2:First formula is calculated by the first formula according to the network connection matrix and the message transmissions path matrix In fault location matrix in the maximum element of numerical value determine in corresponding network there is location of fault;
First formula is:
Wherein, Km×mFor intermediary matrix, Cm×mFor the network connection matrix, Dm×mFor the message transmissions path matrix, Gm×mFor The fault location matrix, quantity of the m for intelligent substation communication network middle port, p is the message link that alarm occurs, and n is The message link having in communication network.
2. a kind of Fault Locating Method of substation communication network according to claim 1, it is characterised in that the step Also include after S1:
MMS warning information in communication network is monitored by network message analyser, is obtained according to the MMS warning information and is occurred The message link of alarm.
3. a kind of Fault Locating Method of substation communication network according to claim 1, it is characterised in that the step Also include before S1:
Real-time reception simultaneously parses the MMS warning information in communication network, if including MMS message chain ruptures in the MMS warning information Warning information, then enter step S1.
4. a kind of Fault Locating Method of substation communication network according to claim 1, it is characterised in that the step S2 is specifically included:
Calculated in first formula by the first formula according to the network connection matrix and the message transmissions path matrix Fault location matrix;
It is g according to maximum element in fault location matrixijIf i-j correspond to physical connection, illustrate that failure occurs in port On optical fiber between i or j or two port, if i-j correspond to logic connection, illustrate that failure is present in the logic connection corresponding Switch on.
5. a kind of Fault Locating Method of substation communication network according to claim 1, it is characterised in that the basis The topology information of intelligent substation communication network obtains network connection matrix and is specially:Network connection Matrix Cm×mSpecifically for retouching The correspondence between substation communication network port is stated, is obtained by below equation:
Wherein,
The annexation mainly has two kinds:Physical connection and logic connecting relation, wherein, physical couplings master between port The physical medias such as optical fiber to be passed through are set up, and logic connecting relation is mainly set up to the exchange control logic of message by switch 's.
6. a kind of Fault Locating Method of substation communication network according to claim 1, it is characterised in that the basis The topological sum message transmissions mode of intelligent substation communication network obtains the transmission path of each link packet and forms corresponding report Literary transmission path matrix is specially:If one link packet is P from port a to the transmission path of port ba-b={ a-c, c-b }, A message transmissions path matrix D is defined according to the transmission path and below equation of this message thenm×m
Wherein,
.
7. a kind of fault locator of substation communication network, based on the one kind as described in any one in claim 1 to 6 The Fault Locating Method of substation communication network is positioned, it is characterised in that included:
Matrix acquisition module, for obtaining network connection matrix according to the topology information of intelligent substation communication network, according to intelligence The topological sum message transmissions mode of energy substation communication network obtains the transmission path of each link packet and forms corresponding message Transmission path matrix;
Formula computing module, based on passing through the first formula according to the network connection matrix and the message transmissions path matrix Calculate the maximum element of numerical value in the fault location matrix in first formula and determine the position that there is failure in corresponding network Put.
8. the fault locator of a kind of substation communication network according to claim 7, it is characterised in that also include:
Warning message link acquisition module, for monitoring the MMS warning information in communication network, root by network message analyser The message link that alarm occurs is obtained according to the MMS warning information.
9. the fault locator of a kind of substation communication network according to claim 7, it is characterised in that also include:
Real-time monitoring module, for real-time reception and parses the MMS warning information in communication network, if the MMS warning information In include MMS message chain rupture warning information, then execute matrix acquisition module.
10. a kind of fault locator of substation communication network according to claim 7, it is characterised in that the public affairs Formula computing module is specifically included:
Matrix calculation unit, based on passing through the first formula according to the network connection matrix and the message transmissions path matrix Calculate the fault location matrix in first formula;
Location determination unit, for being g according to maximum element in fault location matrixijIf i-j correspond to physical connection, Illustrate that failure occurs on the optical fiber between port i or j or two port, if i-j correspond to logic connection, illustrate that failure is deposited It is that the logic connects on corresponding switch.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107864011A (en) * 2017-09-18 2018-03-30 中国南方电网有限责任公司 Merge the intelligent locating method of the protection channel abnormal position judgment of multi-source information
CN107864011B (en) * 2017-09-18 2019-07-23 中国南方电网有限责任公司 Merge the intelligent locating method of the protection channel abnormal position judgement of multi-source information

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