CN110380514A - A kind of intelligent substation relay protection secondary circuit method for diagnosing faults - Google Patents

A kind of intelligent substation relay protection secondary circuit method for diagnosing faults Download PDF

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Publication number
CN110380514A
CN110380514A CN201910709596.5A CN201910709596A CN110380514A CN 110380514 A CN110380514 A CN 110380514A CN 201910709596 A CN201910709596 A CN 201910709596A CN 110380514 A CN110380514 A CN 110380514A
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circuit
empty
secondary circuit
fault
intelligent substation
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CN110380514B (en
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陈勇
戴志辉
李胜男
鲁浩
戴云航
袁明
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Electric Power Research Institute of Yunnan Power System Ltd
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Electric Power Research Institute of Yunnan Power System Ltd
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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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00019—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using optical means
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Locating Faults (AREA)

Abstract

The present invention relates to intelligent substation technical fields; specially a kind of intelligent substation relay protection secondary circuit method for diagnosing faults; this method parses SCD file first and obtains physical loop information and empty circuit information and their mapping relations, establishes circuit and empty circuit breaking warning information table on this basis.When a failure occurs it, normal component is excluded using each empty circuit intersection, overlapping features and circuit alarm, empty circuit breaking warning information table to the secondary circuit of each suspected fault, obtains the suspicious element collection of the secondary circuit.Finally, obtaining each element leads to the confidence level of secondary circuit failure using element self-checking alarming as evidence source, secondary circuit failure diagnosis is realized.The present invention can carry out fault diagnosis to relay protection secondary circuit in real time, effectively, reduce malfunction elimination amount, and service personnel is helped quickly to carry out failure accurate positioning, save intelligent substation O&M cost, effectively improve O&M efficiency.

Description

A kind of intelligent substation relay protection secondary circuit method for diagnosing faults
Technical field
The present invention relates to intelligent substation technical field more particularly to a kind of events of intelligent substation relay protection secondary circuit Hinder diagnostic method.
Background technique
Intelligent substation based on IEC61850 is the key link of smart grid, realize station equipment it is intelligent, Information transfer network, traffic model standardization.Currently, configuration file (the substation of intelligent substation Configuration description, SCD) substation information can be described, but empty circuit, Yi Jixu cannot be expressly recited Mapping relations between circuit and physical loop.When intelligent substation relay protection secondary circuit breaks down, operation maintenance personnel It can not efficiently determine abort situation, malfunction elimination larger workload, and may cause longer restore electricity the time.Therefore, Studying intelligent substation relay protection secondary circuit method for diagnosing faults has pole to the operation and maintenance work of intelligent substation Its important meaning.
Currently, the fault diagnosis technology to primary equipment has reached its maturity, and to relay protection secondary circuit fault diagnosis The research of method is deficient, almost without effective diagnostic method.
Summary of the invention
In view of this, the present invention is by establishing circuit alarm and empty circuit breaking warning information table, it is when a failure occurs it, right Each suspected fault secondary circuit utilizes each empty circuit intersection, overlapping features and circuit alarm and empty circuit breaking alarm letter It ceases table and excludes normal component, obtain the suspicious element collection of the secondary circuit.Finally, being obtained using element self-checking alarming as evidence source Each element leads to the confidence level of secondary circuit failure, to determine fault element, the present invention can in real time, effectively to relay protection two Minor loop carries out fault diagnosis, reduces malfunction elimination amount, and service personnel is helped quickly to carry out failure accurate positioning, saves intelligence and becomes Power station O&M cost effectively improves O&M efficiency.
The present invention solves above-mentioned technical problem by following technological means:
Intelligent substation relay protection secondary circuit method for diagnosing faults of the invention, first parsing configuration file (SCD) ExtRef element can obtain the connection relationship between each smart machine, realize the visualization function in empty circuit, establish intelligence Substation's physical loop model and empty loop model and the mapping relations between them.
Further, the step of actual situation loop map method is as follows:
(1) intelligent substation SCD file is parsed, the physics for including in smart machine Port field and Cable field is obtained Port-mark and optical fiber (cable) mark for connecting the physical port, form physics port information table；
(2) physical port all in physical port information table is traversed, physical loop is formed by Fiber Identification；
(3) the intAddr field for parsing intelligent station SCD file obtains the mapping between physical loop and empty circuit.
Further, suspected fault element set being identified, each empty circuit of intelligent substation may intersect, be overlapped, A certain element fault may cause a plurality of empty circuit while alert.If a certain void circuit no alarm, intersects with the circuit, is Chong Die Other circuits juxtaposition part be it is normal, i.e., excluded by normal empty circuit normal on suspected fault secondary circuit Element reduces fault coverage, obtains suspected fault element set.Such as:
It is exemplified by Table 1 below by establishing empty circuit breaking warning information table and is illustrated.G in table1~G4Become for four Power station void circuit, communication alarm indicate that empty circuit is abnormal for 1, and communication alarm indicates that empty circuit is normal for 0.A~D represents physics member Part (smart machines such as combining unit, protective device, intelligent terminal or optical fiber, cable).
The empty circuit breaking warning information table of table 1
If empty circuit does not include certain element, the corresponding cell of the element is sky；If empty circuit is abnormal, the void The physical component corresponding unit lattice that circuit includes take 1；If empty circuit is normal, the physical component which includes is corresponding single First lattice take 0.
Seeking for element warning value is regular as follows: when certain physical component one column are without 0, element warning value is equal to the column institute Have the sum of 1, such as B column element warning value is equal to the sum of 1 of the column the first row and the third line, element warning value is 2；When certain physics In the presence of element one shows 0, element warning value is 0, such as A element column fourth line has 0, it was demonstrated that A is normal component, therefore A Element warning value is 0.
Table 1 using empty circuit breaking warning information table can only exclude A element and D element be it is trouble-free, can not determine B member Part, C-element whether failure, therefore suspected fault element set be { B C }.Therefore by establishing empty circuit breaking warning information table Suspected fault range of components can only be reduced, suspected fault element set is obtained, the fault element of secondary circuit can not be accurately positioned.
Further, degree of belief calculating is carried out to secondary circuit failure element:
(1) defined function m (A) is degree of belief function, and has following property: (1) m (φ)=0；(2)Element self-checking alarming degree of belief function generation method is as follows:
(2) when a failure occurs it, determine that the corresponding protective relaying device of certain secondary circuit is tripping or mistake by analyzing It is dynamic.
(3) it is searched according to power grid OMS system and counts protective relaying device since suspicious element set is (by empty circuit breaking Warning information table obtains suspicious element set) lead to tripping (malfunction) number.
(4) the degree of belief function for calculating a certain suspicious element, shown in calculation method such as formula (1).
By said elements self-checking alarming degree of belief function generation method, each element self-checking alarming (evidence can be obtained Source) to the degree of belief function of each element in suspected fault element set, i.e. the evidence source thinks each element as protection two The confidence level of minor loop tripping (malfunction) reason.
Further, secondary circuit failure element is positioned:
If m1、m2、…mnFor n evidence source, then evidence source miWith evidence source mjBetween conflict kijIt indicates, kijIt calculates Shown in method such as formula (2).
In formula, Ax、AyFor the corresponding different propositions of evidence source, A in the present inventionx、AyRepresent suspected fault element.
Shown in the calculation method of Certainty Factor ε such as formula (3).
In formula, ε is the subtraction function of evidences conflict factor average value, i.e., when the conflict between evidence increases, ε will be reduced.
Shown in composition rule calculation method such as formula (4).
In formula, k is the conflict factor, its size reflects the conflict spectrum of all evidence sources；Y (A) indicates evidence source pair The Average Supports of conclusion A.M (A) is the combining evidences result of conclusion A.From formula (4) Article 2 formula can be seen that when conflict compared with Hour, conflict factor k is minimum (k → 0), and the result of M (A) is mainly determined by the part Y (A) in composite formula.When conflicting larger, Factor k conflict close to 1 (k → 1), the result of M (A) is mainly determined by k × ε × Y (A) in composite formula, while according to M's (A) The fault self-checking alarming information of secondary circuit other elements where size combination failure element carries out analyzing determining fault element.
Beneficial effects of the present invention: alerting empty circuit breaking warning information table by establishing circuit, when a failure occurs it, right Each suspected fault secondary circuit is intersected using each empty circuit, overlapping features and circuit alert empty circuit breaking warning information Table excludes normal component, obtains the suspicious element collection of the secondary circuit.Finally, being obtained each using element self-checking alarming as evidence source Element leads to the confidence level of secondary circuit failure, to determine fault element, the present invention can in real time, effectively to relay protection secondary Circuit carries out fault diagnosis, reduces malfunction elimination amount, and service personnel is helped quickly to carry out failure accurate positioning, saves intelligent power transformation It stands O&M cost, effectively improves O&M efficiency.
Detailed description of the invention
Fig. 1 is algorithm flow schematic diagram of the invention；
Fig. 2 is 220kV intelligent substation secondary loop diagram.
Specific embodiment
Below with reference to the drawings and specific embodiments, the present invention is described in detail:
The present invention verifies method for diagnosing faults by taking 220kV intelligent substation relay protection secondary circuit as an example, after The physical loop figure of electric protection secondary circuit is as shown in Figure 2.Fig. 2 shares 9 elements, 12 routes.L1~L12It is each for optical fiber The carrier of information transmitting between device；SW0~SW2For interchanger；MU is combining unit；P1、P2For line protective devices；P3For Busbar protective device；IED is intelligent terminal；CL is measurement and control unit.It is realized between measure and control device and other devices by interchanger Network communication.
In the present embodiment, table 4 provides corresponding empty circuit number to 12 empty circuits in 220kV intelligent station secondary circuit G1~G12, and filled in the element on the corresponding physical loop in each void circuit according to empty circuit and physical loop mapping method In table 2, separated between element and port with " ".For example, G7 void circuit is that transmission line protection P1 directly adopts the straight void for jumping signal time Road, MU is by sampled value by MU.1-B
The empty circuit of table 2 and physical loop mapping table
Port passes through L1Sampled value is transmitted to P1.1-A port, protective device P1Logic judgment is carried out after receiving sampled value, By P1.1-B port passes through L4Trip signal is transmitted to the port IED.1-A, IED is according to the signalizing activity received.
In the present embodiment, when relay protection secondary circuit, which breaks down, leads to relay fail, empty circuit G4、G7、G8、G11 It breaks down, issues empty circuit breaking alarm signal, every empty circuit corresponds to the element on physical loop and all sets 1.Void is not alerted Circuit G1、G2、G3、G5、G6、G9、G10、G12Element on corresponding physical loop sets 0, empty circuit breaking warning information table such as 3 institute of table Show.Then, it seeks obtaining each physical component MU, MU.1-A, MU.1-B, MU.2-A, P with element warning value1.1-A、P3.1- A、L1、L3、L5Element warning value be respectively 4,1,1,2,1,1,1,2,1, other physical component element warning values be 0.Therefore, The suspected fault element set for leading to relay protection secondary circuit failure is { MU, MU.1-A, MU.1-B, MU.2-A, P1.1-A、 P3.1-A、L1、L3、L5}。
3 relay protection secondary circuit void circuit breaking warning information table of table
Physical component Element warning value Physical component Element warning value Physical component Element warning value
MU 4 IED.1-B 0 SW2.1-B 0
MU.1-A 1 IED.2-A 0 P2 0
MU.1-B 1 SW0.1-A 0 P2.1-C 0
MU.2-A 2 SW0 0 L1 1
P1 0 SW0.1-B 0 L2 0
P1.1-A 1 SW0.1-C 0 L3 2
P1.1-B 0 SW1.1-A 0 L4 0
P1.1-C 0 SW1 0 L5 1
P3.1-A 1 SW1.1-B 0 L6 0
P3.1-B 0 SW1.1-C 0 L7 0
P3 0 SW1.1-D 0 L8 0
P3.1-C 0 SW1.2-A 0 L9 0
IED 0 SW2 0 L10 0
IED.1-A 0 SW2.1-A 0 L11 0
L12 0
By the empty circuit breaking warning information table result of table 3 it is found that the empty circuit breaking warning information table of foundation can be abundant Using empty circuit breaking warning information, secondary circuit failure range is reduced, obtains suspected fault element set.
In the present embodiment, this relay protection tripping is in addition to the empty circuit breaking that uses in empty circuit breaking warning information table Except warning information, there are also combining unit SV to interrupt alarm m1With combining unit self-checking alarming m2, the two self-checking alarming information will As the evidence source for seeking fault element confidence level.
In the present embodiment, data, knot are recorded according to relay protection fault history, failure cause in power grid OMS system The credit assignment table that conjunction element self-checking alarming degree of belief function generation method can obtain two warning information is as shown in table 4.
In the present embodiment, by m in table 41The degree of belief function of evidence source and the degree of belief function of m2 evidence source substitute into formula (2) M can be obtained1And m2Between conflict k12=0.6546.By k12Substitution formula (3) can obtain Certainty Factor ε=0.5196.Finally, utilizing It is as shown in table 4 that composite result can be calculated in formula (4) composition rule.
The composite result of combining unit MU is maximum as shown in Table 4, is 49.12%.The port MU.1-A of combining unit MU, The port MU.1-B and the port MU.2-A composite result are respectively 6.39%, 4.94% and 5.21%, optical fiber L1、L3、L5Synthesis knot Fruit maintains essentially in 1% or so, and the composite result of these physical components is much smaller than the composite result 49.12% of combining unit, closes And unit is the physical component for leading to relay protection secondary circuit failure.P in suspected fault element set1.1-A、P3.1-A Composite result is 0, i.e., the two physical components are not the reason of leading to relay protection secondary circuit failure.
In the present embodiment, to sum up, this relay fail is the service personnel as caused by combining unit MU device failure itself Combining unit MU device itself should be checked at once, be repaired.
This example demonstrates that intelligent substation relay protection secondary circuit method for diagnosing faults proposed by the present invention can have Intelligent substation relay protection secondary circuit fault diagnosis is realized on effect ground, is had to intelligent substation maintenance work very important Meaning.
4 composite result of table
MU MU.1-A MU.1-B MU.2-A P1.1-A P3.1-A L1 L3 L5
m1 0.48 0.12 0.1 0.13 0 0 0.06 0.05 0.06
m2 0.63 0.15 0.12 0.1 0 0 0 0 0
Improved method 0.4912 0.0639 0.0494 0.0521 0 0 0.0102 0.0085 0.0102
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to preferred embodiment to this hair It is bright to be described in detail, those skilled in the art should understand that, it can modify to technical solution of the present invention Or equivalent replacement should all cover without departing from the objective and range of technical solution of the present invention in claim of the invention In range.Technology not described in detail in the present invention, shape, construction portion are well-known technique.

Claims (3)

1. a kind of intelligent substation relay protection secondary circuit method for diagnosing faults, which comprises the following steps:
Step 1: parsing intelligent substation SCD file obtains the physics end for including in smart machine Port field and Cable field Mouth identifies and connects the optical fiber of the physical port, cable identification, forms physics link information table and empty circuit information table；
Step 2: the intAddr field of parsing intelligent station SCD file establishes mapping relations between physical loop and empty circuit simultaneously Establish empty circuit breaking warning information table；
Step 3: carrying out relay protection secondary circuit fault diagnosis using empty circuit breaking warning information table, reduce secondary circuit event Hinder range, obtains suspected fault element set and jumped if without fault message if there is fault message then carries out step 4 To step 2；
Step 4: the generation method of element self-checking alarming degree of belief function is proposed, then by seeking each element fault confidence level pair Element in suspected fault element set is judged, specific to position secondary circuit failure element, completes fault diagnosis, returns to step Rapid 2.
2. a kind of intelligent substation relay protection secondary circuit method for diagnosing faults according to claim 1, feature exist In the step 3 is specific to be executed as follows:
Step 3.1: if empty circuit does not include certain element, which is denoted as sky；If empty circuit is abnormal, void circuit packet All physical components correspondence contained is denoted as 1, if empty circuit is normal, all physical components correspondence which includes is denoted as 0；
Step 3.2: multiple empty circuits are overlapped calculating, when certain physical component is all 1 in different empty circuits, element Warning value is equal to all the sum of 1, when certain physical component has the element alarm when an empty circuit is 0 in different empty circuits Value is 0, while by the component exclusion for zero, remaining component is suspected fault element set.
3. a kind of intelligent substation relay protection secondary circuit method for diagnosing faults according to claim 1, feature exist In the step 4 is specific to be executed as follows:
Step 4.1: defined function m (A) is degree of belief function, and has following property: (1) m (φ)=0, (2)
Step 4.2: degree of belief function generation method is as follows:
Step 4.2.1: when a failure occurs it, by analyze determine the corresponding protective relaying device of certain secondary circuit be tripping or Malfunction；
Step 4.2.2: searching according to power grid OMS system and counts protective relaying device due to by empty circuit breaking warning information table The suspicious element set obtained leads to the number of tripping or malfunction；
Step 4.2.3: the degree of belief function of a certain suspicious element is calculated, shown in calculation method such as formula (1)；
Step 4.3: according to protective relaying device secondary circuit element self-checking alarming information i.e. the feature of evidence source, synthesis rule It is then as follows:
Step 4.3.1: m is set1、m2、…mnFor n evidence source, then evidence source miWith evidence source mjBetween conflict kijIt indicates, kijShown in calculation method such as formula (2)；
In formula, Ax、AyFor the corresponding different propositions of evidence source, A in the present inventionx、AyRepresent suspected fault element；
Step 4.3.2: according to shown in the calculation method of confidence level ε such as formula (3):
In formula, ε is the subtraction function of evidences conflict factor average value；
Step 4.3.3: shown in composition rule calculation method such as formula (4):
In formula, k is the conflict factor, its size reflects the conflict spectrum of all evidence sources, and Y (A) indicates evidence source to conclusion A Average Supports, M (A) be conclusion A combining evidences result；
Step 4.4: the identification of fault element is carried out according to the numerical value of M (A), the higher element fault probability of the numerical value of M (A) is more Greatly, it carries out analyzing determining fault element according to the element binding member self-checking alarming information to the secondary circuit where M (A).
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CN111884715A (en) * 2020-06-08 2020-11-03 国网山东省电力公司建设公司 Fault positioning method and device for optical circuit of secondary system of transformer substation
CN112345872A (en) * 2020-12-04 2021-02-09 中国南方电网有限责任公司超高压输电公司昆明局 Converter station secondary circuit abnormity identification and early warning method based on deep confidence network
CN112422324A (en) * 2020-10-28 2021-02-26 国网山东省电力公司电力科学研究院 Secondary system fault positioning method based on improved Bayesian algorithm
CN113722883A (en) * 2021-07-26 2021-11-30 国网河北省电力有限公司石家庄供电分公司 Intelligent substation secondary circuit fault positioning method
CN113848471A (en) * 2021-10-20 2021-12-28 南京理工大学 Fault intelligent positioning method and system for relay protection system
CN117313189A (en) * 2023-12-01 2023-12-29 国网山东省电力公司淄博供电公司 Visual analysis method, system, terminal and storage medium for optical fiber secondary circuit
CN117691755A (en) * 2024-02-02 2024-03-12 南京雅宸众联电力技术有限公司 Visual monitoring and anomaly detection system for secondary circuit of intelligent substation

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