CN110244181A - Marine wind electric field collection electric line sea cable electric fault localization method and its device - Google Patents
Marine wind electric field collection electric line sea cable electric fault localization method and its device Download PDFInfo
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- CN110244181A CN110244181A CN201910561880.2A CN201910561880A CN110244181A CN 110244181 A CN110244181 A CN 110244181A CN 201910561880 A CN201910561880 A CN 201910561880A CN 110244181 A CN110244181 A CN 110244181A
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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
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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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
- G01R31/088—Aspects of digital computing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The present invention relates to marine wind electric field technical fields, disclose a kind of marine wind electric field collection electric line sea cable electric fault localization method, include the following steps: to remember that the tie point of bus and each wind power generating set and sea cable is node, obtain each node forward-order current, negative-sequence current, zero-sequence current and positive sequence voltage, negative sequence voltage, residual voltage, and then fault type is judged by the existence of forward-order current, negative-sequence current, zero-sequence current, the number of failure cable is then judged by the zero sequence power direction of node or negative -sequence power direction.The invention also discloses a kind of marine wind electric field collection electric line sea cable electric fault positioning devices.Marine wind electric field collection electric line sea cable electric fault localization method and its device of the present invention, newly added equipment is few, technology practicability is strong, and failure sea cable can be accurately positioned real-time, quickly, and principle is simple, locating speed is fast, high reliablity, while it is few to increase input.
Description
Technical field
The present invention relates to marine wind electric field technical fields, and in particular to a kind of marine wind electric field collection electric line sea cable electrically event
Hinder localization method and its device.
Background technique
Currently, the fault zone positioning to land transmission line of electricity and underground cable is mainly the following method:
1) impedance method can be divided into single-ended method and both-end method.The advantages of impedance method is that accuracy is higher and principle compares
Simply, but the scope of application is small, the very big high resistive fault of ground resistance and when arcing fault in test failure cable, Wu Fada
To satisfied effect.
Wherein, single-ended method only uses the voltage of route side, current measurement value, can not overcome the influence of ground connection transition resistance,
Location algorithm need to carry out certain hypothesis.Both-end rule utilizes voltage, the current measurement value of route two sides, can eliminate transition resistance
Influence to positioning accuracy, but the time reference benchmark that obtained voltage and current amount needs to have unified.
2) traveling wave method has using more travelling wave ranging method: low voltage pulse reflection method and high-tension arc bounce technique at present.
When primarily directed to cable disconnection fault, short trouble and low-impedance earthed system failure occur for low voltage pulse reflection method
It is applied.Advantage is that principle is simple, is easy to use, for the of less demanding of failure cable, and can be according to reflected impulse
Waveform further judge cable fault type, help more rapid to find out fault point.The disadvantage is that application range has limitation,
It cannot be used for high resistance ground and arcing fault.
The advantages of high-tension arc bounce technique is that destructyve breakdown will not be caused to fault point, and test speed is fast.The disadvantage is that due to
High-tension arc generator and pulse tester all work in same point, will cause influence mutually, pulse tester is possible to can be high
Crushing is bad, can be also influenced when electrion by pulse signal and fault point be made to be not easy to puncture.
3) traveling wave inherent frequency method, the algorithm need previously known failure mode, have used failure excessive resistance and ground connection
Resistance, since actual short-circuit conditions are complicated, fault impedance matrix is difficult to determine.Furthermore the algorithm is exactly there are a difficult point
Mode determines rank, for complicated transient fault traveling wave, determine rank still be possible to it is more troublesome.
In addition, there are also along the cable laying temperature sensing cable and one by one method of on-load switch drawing, both methods economy
Type is poor, and requires a lot of manpower and time, and not applicable this special application scenarios of marine wind electric field.
The cable fault localization method of above-mentioned several current mainstreams is widely used by land, technology also more at
It is ripe.But since the development of domestic offshore wind farm is later, it is in the infancy, does not take above-mentioned in practical projects
A kind of what method, to be positioned to failure sea cable, in the market also temporarily without any for the event of marine wind electric field collection electric line
Hinder the maturing appts of sea cable positioning.And above-mentioned several method, to the test, judgement, positioning of faulty line be required to investment compared with
A large amount of equipment, and the regular hour is expended, if the method for land transmission open acess is blindly applied to sea turn
Electrical domain, due to existing land power transmission line fault locating method, at sea in application, that there are technical solutions is complex,
Technical feasibility is not strong, and equipment input cost is high and human resources expend the problems such as big.And offshore wind farm failure sea cable is determined
Position does not need to carry out accurately ranging localization to failure, but only that judge which section sea cable breaks down, it can be original
In Equipment Foundations, by increasing device as few as possible, the positioning of realization failure sea cable quick, accurate, at low cost is current
The urgent need of sea cable electric fault positioning.
Summary of the invention
The purpose of the present invention is to the deficiencies of above-mentioned technology, and it is electrical to provide a kind of marine wind electric field collection electric line sea cable
Fault Locating Method and its device, newly added equipment is few, technology practicability is strong, and failure sea cable can be accurately positioned real-time, quickly, former
Reason is simple, locating speed is fast, high reliablity, while it is few to increase input.
To achieve the above object, the marine wind electric field collection electric line sea cable electric fault localization method designed by the present invention,
Include the following steps:
A the tie point for) remembering bus and sea cable is node J0, the tie point of each wind power generating set and sea cable is node J1, section
Point J2... node Jn... node Ji, node J0To node JiThe sea cable is divided into sea cable unit H1~sea cable unit Hi, obtain each
Node JnForward-order currentNegative-sequence currentZero-sequence currentAnd positive sequence voltageNegative sequence voltageResidual voltage
B) when there are zero-sequence currentsAnd there are forward-order currentsAnd negative-sequence currentWhen, enter step C),
When there is no zero-sequence currentsBut there are forward-order currentsAnd negative-sequence currentWhen, enter step D)；
C) pass through the step A) obtain each node JnZero-sequence currentAnd residual voltageIt is calculated
Each node JnZero sequence power direction angle θn0,
Remember θn0When ∈ (- 90 °, 90 °), node JnZero sequence power direction be positive, note digital signal be In0=1, remember θn0∈
When (90 °, 270 °), node JnZero sequence power direction be negative, note digital signal be In0=0, work as In0=1, and I(n+1)0When=0,
Then sea cable unit n+1 is failure cable；
D) pass through the step A) obtain each node JnNegative-sequence currentAnd negative sequence voltageIt is calculated
Each node JnNegative -sequence power direction angle θn2,
Remember θn2When ∈ (- 90 °, 90 °), node JnNegative -sequence power direction be positive, note digital signal be In2=1, remember θn2∈
When (90 °, 270 °), node JnNegative -sequence power direction be negative, note digital signal be In2=0, work as In2=1, and I(n+1)2When=0,
Then sea cable unit n+1 is failure cable.
A kind of marine wind electric field collection electric line sea cable electric fault positioning device, including pass through blower ring network cabinet and several
The starting point of the sea cable of wind power generating set connection, the sea cable is connect by current collection line switching cabinet with bus, the sea cable
It is equipped with on-load switch positioned at the blower ring network cabinet interior section, the on-load switch is located at the sea cable and the wind-power electricity generation
The downstream of the node of unit connection, the current collection line switching cabinet are equipped with the bus-bar potential transformer connecting with the bus and position
In the current collection line current mutual inductor of sea cable starting end position, it is characterised in that: be all provided in each blower ring network cabinet
There are measurement voltage transformer and measurement current transform er, the measurement voltage transformer to be connected on the node, the measurement
Current transformer is equipped in the current collection line switching cabinet between the node and the on-load switch and acquires the bus
The integrated protection and monitoring device of voltage transformer sum aggregate electric line current transformer measuring signal, in each blower ring network cabinet
It is equipped with the integrated protection and monitoring device for acquiring the measurement voltage transformer and measurement current transform er measuring signal, it is described comprehensive
It closes and is sequentially connected end to end between protection supervisory equipment by optical fiber ring network.
Preferably, the generator in wind power generating set is connected with low-pressure side disconnecting switch, and low-pressure side disconnecting switch is connected with liter
Buckling, blower ring network cabinet is interior to be equipped with the high-pressure side disconnecting switch for becoming connection with boosting, and high-pressure side disconnecting switch is connected with breaker, disconnected
Road device is connected on node, and boosting, which becomes, is disposed with blower ring network cabinet current transformer between the disconnecting switch of high-pressure side, high-pressure side every
Leaving connection has earthing switch.
Compared with prior art, the present invention having the advantage that
1, the electric characteristics parameters such as electric current, voltage, resistance value when without by failure come rational judgment fault point, but
By the fault power direction of each node, qualitatively fault point is judged, principle is simple, locating speed is fast, high reliablity；
2, without increasing additional integrated protection and monitoring device, it is only necessary to increase in existing each integrated protection and monitoring device
Power direction judgement and fault location decision logic algorithm realize wind-force by existing integrated protection and monitoring device simultaneously
Generating set, blower boosting becomes and the monitoring and protection of sea cable；
3, this programme newly added equipment is few, and increased costs are few, can real-time, rapid, accurate positioning failure sea cable, effectively
Generate electricity in the year of the generated energy and separate unit blower that improve wind power plant hourage, and economic benefit is obvious.
Detailed description of the invention
Fig. 1 is that the chain topological layout of marine wind electric field collection electric line sea cable electric fault positioning device of the present invention schemes；
Fig. 2 is the signal acquisition and transmission signal of marine wind electric field collection electric line sea cable electric fault positioning device of the present invention
Figure；
Fig. 3 is the embodiment schematic diagram of marine wind electric field collection electric line sea cable electric fault positioning device of the present invention.
Each part numbers are as follows in figure:
Wind power generating set 1, blower ring network cabinet 2, sea cable 3, current collection line switching cabinet 4, bus 5, on-load switch 6, node
7, bus-bar potential transformer 8, current collection line current mutual inductor 9, measurement voltage transformer 10, measurement current transform er 11, synthesis
Protection supervisory equipment 12, optical fiber ring network 13, disconnecting switch 14, boosting become 15, high-pressure side disconnecting switch 16, breaker 17, ground connection
Switch 18, generator 19, blower ring network cabinet current transformer 20.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of marine wind electric field collection electric line sea cable electric fault localization method, includes the following steps:
A the tie point for) remembering bus and sea cable is node J0, the tie point of each wind power generating set and sea cable is node J1, section
Point J2... node Jn... node Ji, node J0To node JiThe sea cable is divided into sea cable unit H1~sea cable unit Hi, obtain each
Node JnForward-order currentNegative-sequence currentZero-sequence currentAnd positive sequence voltageNegative sequence voltageResidual voltage
B) when there are zero-sequence currentsAnd there are forward-order currentsAnd negative-sequence currentWhen, enter step C),
When there is no zero-sequence currentsBut there are forward-order currentsAnd negative-sequence currentWhen, enter step D)；
C) each node J obtained by step A)nZero-sequence currentAnd residual voltageEach section is calculated
Point JnZero sequence power direction angle θn0,
Remember θn0When ∈ (- 90 °, 90 °), node JnZero sequence power direction be positive, note digital signal be In0=1, remember θn0∈
When (90 °, 270 °), node JnZero sequence power direction be negative, note digital signal be In0=0, work as In0=1, and I(n+1)0When=0,
Then sea cable unit n+1 is failure cable；
D) each node J obtained by step A)nNegative-sequence currentAnd negative sequence voltageEach section is calculated
Point JnNegative -sequence power direction angle θn2,
Remember θn2When ∈ (- 90 °, 90 °), node JnNegative -sequence power direction be positive, note digital signal be In2=1, remember θn2∈
When (90 °, 270 °), node JnNegative -sequence power direction be negative, note digital signal be In2=0, work as In2=1, and I(n+1)2When=0,
Then sea cable unit n+1 is failure cable.
As shown in Figure 1, a kind of marine wind electric field collection electric line sea cable electric fault positioning device, including pass through blower looped network
The starting point of the sea cable 3 that cabinet 2 is connect with four wind power generating sets 1, sea cable 3 is connected by current collection line switching cabinet 4 and bus 5
It connects, sea cable 3 is located at 2 interior section of blower ring network cabinet equipped with on-load switch 6, and on-load switch 6 is located at sea cable 3 and wind power generating set
The downstream of the node 7 of 1 connection, current collection line switching cabinet 4 are equipped with the bus-bar potential transformer 8 connecting with bus 5 and are located at sea cable 3
The current collection line current mutual inductor 9 of end position is originated, measurement voltage transformer 10 and measurement are equipped in each blower ring network cabinet 2
Current transformer 11, measurement voltage transformer 10 are connected on node 7, and measurement current transform er 11 is located at node 7 and opens with load
It closes between 6, acquisition 8 sum aggregate electric line current transformer of bus-bar potential transformer, 9 measuring signal is equipped in current collection line switching cabinet 4
Integrated protection and monitoring device 12, acquisition measurement voltage transformer 10 is equipped in each blower ring network cabinet 2 and measurement electric current is mutual
The integrated protection and monitoring device 12 of 11 measuring signal of sensor, it is successively first by optical fiber ring network 13 between integrated protection and monitoring device 12
Tail connection.
Generator 19 in wind power generating set 1 is connected with low-pressure side disconnecting switch 14, and low-pressure side disconnecting switch 14 is connected with liter
Buckling 15, interior be equipped with of blower ring network cabinet 2 become the 15 high-pressure side disconnecting switch 16 connecting with boosting, and high-pressure side disconnecting switch 16 is connected with
Breaker 17, breaker 17 are connected on node 7, and boosting, which becomes between 15 and high-pressure side disconnecting switch 16, is disposed with blower ring network cabinet electricity
Current transformer 20, high-pressure side disconnecting switch 16 are connected with earthing switch 18.
In the present embodiment, marine wind electric field collection electric line uses chain topological layout mode, and switchgear distribution has used
Full switch allocation plan, wiring diagram is as shown in Figure 1, by configuration load switch 6, when a certain section of sea cable 3 breaks down, energy
It is enough only to cut away the wind power generating set 1 connected after failure sea cable 3, the wind power generating set before retention fault sea cable 3
1, it will lose near minimum.
In the present embodiment, in conjunction with shown in Fig. 2 and Fig. 3, the tie point of note bus 5 and sea cable 3 is node J0, each wind-power electricity generation
Unit 1 and the tie point of sea cable 3 are node J1, node J2, node J3, node J4, node J0To nodeSea cable is divided into sea
Cable unit H1~sea cable unit H4。
When sea cable 3 breaks down, node J is measured by bus-bar potential transformer 8, current collection line current mutual inductor 90's
A, b, c three-phase current:
A, b, c three-phase voltage:
The node J measured by measurement voltage transformer 10, measurement current transform er 111, node J2, node J3, node J4
A, b, c three-phase current and three-phase voltage,
Then it is synthesized by symmetrical component method, obtains each node JnForward-order currentNegative-sequence currentZero sequence
Electric currentAnd positive sequence voltageNegative sequence voltageResidual voltageN=0,1,2,3,4.
In this single phase grounding fault, there are zero-sequence currentsAnd there are forward-order currentsWith negative phase-sequence electricity
StreamWhen, and then calculate each node JnZero sequence power direction angle θn0,
Remember θn0When ∈ (- 90 °, 90 °), node JnZero sequence power direction be positive, note digital signal be In0=1, remember θn0∈
When (90 °, 270 °), node JnZero sequence power direction be negative, note digital signal be In0=0, by current collection line switching cabinet 4
Integrated protection and monitoring device 12 and the corresponding integrated protection and monitoring device 12 of each wind power generating set 1 judge each node JnZero
Sequence power direction obtains following table:
Node J0Place's zero sequence power direction is positive, digital signal 1, node J1、J2、J3、J4, locating zero sequence power direction is
It is negative, digital signal 0.Each node JnPlace's homopolar power digital signal is sent by optical fiber ring network 13 to offshore boosting station collection electric line
Integrated protection and monitoring device 12 in switchgear 4, that is, can determine whether sea cable H1Phase-to phase fault occurs for somewhere.
At this point, failure sea cable H can be cut away1The wind power generating set 1 connected later, retention fault sea cable H1Before
Wind power generating set 1, will lose near minimum.
In another secondary phase fault, zero-sequence current zero-sequence current is not presentBut there are forward-order currentsWith
Negative-sequence currentWhen, and then calculate each node JnNegative -sequence power direction angle θn2,
Remember θn2When ∈ (- 90 °, 90 °), node JnNegative -sequence power direction be positive, note digital signal be In2=1, remember θn2∈
When (90 °, 270 °), node JnNegative -sequence power direction be negative, note digital signal be In2=0, by current collection line switching cabinet 4
Integrated protection and monitoring device 12 and the corresponding integrated protection and monitoring device 12 of each wind power generating set 1 judge each node JnIt is negative
Sequence power direction obtains following table:
Node J0、J1、J2Place's negative -sequence power direction is positive, digital signal 1, node J3、Locating negative -sequence power direction is
It is negative, digital signal 0.Each node JnPlace's negative sequence power digital signal is sent by optical fiber ring network 13 to offshore boosting station collection electric line
Integrated protection and monitoring device 12 in switchgear 4, that is, can determine whether sea cable H3Phase-to phase fault occurs for somewhere.
At this point, failure sea cable H can be cut away3The wind power generating set 1 connected later, retention fault sea cable H3Before
Wind power generating set 1, will lose near minimum.
Marine wind electric field collection electric line sea cable electric fault localization method and its device of the present invention, without when passing through failure
The electric characteristics parameter such as electric current, voltage, resistance value comes rational judgment fault point, but by the fault power direction of each node 7,
Qualitatively judge fault point, principle is simple, locating speed is fast, high reliablity；Without increasing additional integrated protection observing and controlling dress
Set 13, it is only necessary to increase power direction judgement and fault location decision logic algorithm in existing each integrated protection and monitoring device 13
, realize wind power generating set 1, blower boosting change 15 and sea cable 3 simultaneously by existing integrated protection and monitoring device 13
Monitoring and protection；This programme newly added equipment is few, and increased costs are few, can real-time, rapid, accurate positioning failure sea cable, effectively
Generate electricity in the year of the generated energy and separate unit blower that improve wind power plant hourage, and economic benefit is obvious.
Claims (3)
1. a kind of marine wind electric field collection electric line sea cable electric fault localization method, characterized by the following steps:
A the tie point for) remembering bus and sea cable is node J0, the tie point of each wind power generating set and sea cable is node J1, node
J2... node Jn... node Ji, node J0To node JiThe sea cable is divided into sea cable unit H1~sea cable unit Hi, obtain each section
The forward-order current of pointNegative-sequence currentZero-sequence currentAnd positive sequence voltageNegative sequence voltageZero
Sequence voltage
B) when there are zero-sequence currentsAnd there are forward-order currentsAnd negative-sequence currentWhen, enter step C), when not
There are zero-sequence currentsBut there are forward-order currentsAnd negative-sequence currentWhen, enter step D)；
C) pass through the step A) obtain each node JnZero-sequence currentAnd residual voltageEach section is calculated
Point JnZero sequence power direction angle θn0,
Remember θn0When ∈ (- 90 °, 90 °), node JnZero sequence power direction be positive, note digital signal be In0=1, remember θn0∈ (90 °,
270 °) when, node JnZero sequence power direction be negative, note digital signal be In0=0, work as In0=1, and I(n+1)0It is when=0, then extra large
Cable unit n+1 is failure cable；
D) pass through the step A) obtain each node JnNegative-sequence currentAnd negative sequence voltageEach section is calculated
Point JnNegative -sequence power direction angle θn2,
Remember θn2When ∈ (- 90 °, 90 °), node JnNegative -sequence power direction be positive, note digital signal be In2=1, remember θn2∈ (90 °,
270 °) when, node JnNegative -sequence power direction be negative, note digital signal be In2=0, work as In2=1, and I(n+1)2It is when=0, then extra large
Cable unit n+1 is failure cable.
2. a kind of marine wind electric field collection electric line sea cable electric fault positioning device as described in claim 1, including pass through blower
The sea cable (3) that ring network cabinet (2) is connect with four wind power generating sets (1), the starting point of the sea cable (3) are opened by collecting electric line
Cabinet (4) to be closed to connect with bus (5), the sea cable (3) is located at blower ring network cabinet (2) interior section and is equipped with on-load switch (6),
The on-load switch (6) is located at the downstream for the node (7) that the sea cable (3) is connect with the wind power generating set (1), the collection
Electric line switchgear (4) is equipped with the bus-bar potential transformer (8) connecting with the bus (5) and is located at the sea cable (3) and originates
The current collection line current mutual inductor (9) of end position, it is characterised in that: measurement electricity is equipped in each blower ring network cabinet (2)
Pressure mutual inductor (10) and measurement current transform er (11), the measurement voltage transformer (10) are connected on the node (7), institute
Measurement current transform er (11) are stated between the node (7) and the on-load switch (6), the current collection line switching cabinet
(4) the integrated protection survey for acquiring bus-bar potential transformer (8) sum aggregate electric line current transformer (9) measuring signal is equipped in
It controls device (12), the acquisition measurement voltage transformer (10) and measurement electric current is equipped in each blower ring network cabinet (2)
The integrated protection and monitoring device (12) of mutual inductor (11) measuring signal passes through optical fiber between the integrated protection and monitoring device (12)
Looped network (13) is sequentially connected end to end.
3. marine wind electric field collection electric line sea cable electric fault positioning device according to claim 2, it is characterised in that: described
Generator (19) in wind power generating set (1) is connected with low-pressure side disconnecting switch (14), and the low-pressure side disconnecting switch (14) is even
There is boosting to become (15), be equipped in the blower ring network cabinet (2) and become the high-pressure side disconnecting switch (16) that (15) are connect with the boosting,
The high-pressure side disconnecting switch (16) is connected with breaker (17), and the breaker (17) is connected on the node (7), the boosting
Become between (15) and the high-pressure side disconnecting switch (16) and be disposed with blower ring network cabinet current transformer (20), the high-pressure side every
It leaves pass (16) and is connected with earthing switch (18).
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| CN112505489A (en) * | 2020-12-14 | 2021-03-16 | 内蒙古华电玫瑰营风力发电有限公司 | Fault positioning method for power collecting line of wind power plant |
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| CN106199330A (en) * | 2016-06-24 | 2016-12-07 | 国电南瑞南京控制系统有限公司 | A kind of marine wind electric field collection line fault alignment system and method |
| CN106405335A (en) * | 2016-11-02 | 2017-02-15 | 华北电力大学 | Wind power T-type connection line ground fault setting method |
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| CN110632440A (en) * | 2019-09-29 | 2019-12-31 | 上海思源弘瑞自动化有限公司 | Transformer fault judgment method and device based on zero and negative sequence power directions |
| CN112505489A (en) * | 2020-12-14 | 2021-03-16 | 内蒙古华电玫瑰营风力发电有限公司 | Fault positioning method for power collecting line of wind power plant |
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