CN108469576A - A kind of multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method - Google Patents
A kind of multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- 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
- H02H7/268—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 for dc systems
Abstract
The present invention relates to a kind of multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection methods, after calculating alternating current-direct current mixing power distribution network generation direct current intereelectrode short-circuit and monopolar grounding fault, the voltage change ratio of each DC line current-limiting inductance determines the threshold value of each step of fault detect；By the voltage change ratio of each DC line current-limiting inductance compared with the failure determination threshold value, the testing result whether alternating current-direct current mixing power distribution network occurs DC Line Fault is obtained；By each DC line current-limiting inductance voltage change ratio compared with faulty line recognition threshold, the recognition result of alternating current-direct current mixing distribution network failure circuit is obtained；Faulty line positive and negative anodes current-limiting inductance voltage change ratio is made the difference, and with fault type recognition threshold value comparison, obtain the recognition result of alternating current-direct current mixing distribution network failure type；Faulty line positive and negative anodes current-limiting inductance voltage change ratio is made the difference, and compared with the judgment threshold of the failure pole, judges alternating current-direct current mixing power distribution network DC Line Fault pole.
Description
Technical field
The present invention relates to a kind of multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection methods, belong to alternating current-direct current mixing distribution
Network technology field.
Background technology
With the fast development of distributed generation technology and the increase of regional power grid demand for interconnection, conventional AC power distribution network is
Through being difficult to meet application request.DC distribution net is compared with conventional AC power distribution network, it is easier to realize that distributed energy connects
Enter, and lower, environmental pollution smaller, power quality higher is lost, starts by domestic and international extensive concern and research.However it wants
Think to replace AC distribution net and unrealistic with DC distribution net completely, from utilizing existing AC distribution net resource and DC distribution net
The angle of advantage is set out, and alternating current-direct current mixing power distribution network will be one of the important form of the following power distribution network.Multiterminal alternating current-direct current mixes
Power distribution network realizes the interconnection of multizone AC distribution net by DC power distribution line, meanwhile, DC power distribution line can be according to need
Ask access distributed generation resource and other loads.Since the damping of DC distribution net is smaller, once DC Line Fault, fault current occurs
It will increase sharply, and involve whole system.Especially after constituting multiterminal element power grid, the superposition meeting of multiple current conversion station fault currents
The damage of bigger is caused to system.This just proposes high requirement to the fault detect speed and precision of system, it is generally the case that
The protection system of DC grid needs to detect DC line fault in 2ms, and the fault detect skill of existing AC distribution net
Art is unable to reach the requirement.Therefore, it is necessary to propose a kind of fast and accurately direct current event for multiterminal alternating current-direct current mixing power distribution network
Hinder detection method.
In recent years, the correlative study detected about DC Line Fault has been carried out both at home and abroad.Yang J,Fletcher J E,
O'Reilly J etc. exist《IEEE Transactions on Industrial Electronics》The 10th phase of volume 59 in 2012
Written by《Short-Circuit and Ground Fault Analyses and Location in VSC-Based DC
Network Cables》, analyze the fault current feature of single current conversion station DC Line Fault different phase, it is proposed that corresponding failure
Current expression, but only single ended system is analyzed, the contribution of multiple current conversion stations is not considered.Tang L, Ooi B T exist
《IEEE Transactions on Power Delivery》Written by the 3rd phases of volume 22 in 2007《Locating and
Isolating DC Faults in Multi-Terminal DC Systems》, it is proposed that failure is carried out using " method of shaking hands "
Identification of lines, but fault identification speed is slower, and the judgement of the identification and failure pole of fault type is not considered.Fletcher S D
A, Norman P J, Fong K etc. exists《IEEE Transactions on Smart Grid》Written by the 5th phases of volume 5 in 2014
《High-speed differential protection for smart DC distribution systems》, propose profit
DC Line Fault wireline inspection is carried out with DC line both ends current differential, this method needs the communication synchronization at circuit both ends, is easy
It is influenced by communication delay, and the detection method based on electric current is easy to be interfered by the discharge current of line distribution capacitance.Li R,
Xu L, Yao L exist《IEEE Transactions on Power Delivery》Written by the 3rd phases of volume 32 in 2017《DC
fault detection and location in meshed multiterminal HVDC systems based on DC
reactor voltage change rate》, propose to realize that DC Line Fault is examined using DC line current-limiting inductance voltage change ratio
It surveys, but does not consider the fault characteristic of non-faulting current conversion station after DC Line Fault, and only DC Line Fault detection method is ground
Study carefully, does not mention the judgment method of fault type and failure pole.Bi Tianshu, Wang Shuai, Jia Ke are waited《Electric power network technique》2016
Written by the phase of volume 40 the 3rd《Multiterminal flexible direct current monopolar grounding fault identification of lines method based on short-time energy》, sent out using system
The short-time energy of fault current identifies direct current monopolar grounding fault circuit after raw DC Line Fault, but institute's extracting method is to adopting
Sample data volume is more demanding, and fault detect speed is slower, and detection object is only limitted to monopolar grounding fault, not to intereelectrode short-circuit event
Barrier characteristic is analyzed.Xiao Liye, Wei Tongzhen, Zhu Jin etc. are in Chinese patent 201610326099《A kind of DC grid failure inspection
Survey positioning device》In propose a kind of looped network of DC power Fault Locating Method, but do not account for identification and the failure pole of fault type
Judgement.
In short, existing research is studied for single ended system mostly, and after not considering multi-terminal system DC Line Fault, non-faulting
The fault characteristic of current conversion station, and existing research does not propose to include fault detect, faulty line identification, fault type recognition and event
Hinder the comprehensive DC Line Fault detection method that pole judges.
Invention content
The purpose of the present invention：Overcome the deficiencies of the prior art and provide a kind of multiterminal alternating current-direct current mixing power distribution network DC Line Fault
Detection method, process fault detection convenience of calculation, detection method are simple and practicable, it can be achieved that multiterminal alternating current-direct current mixing power distribution network direct current
The quick and precisely prediction of failure, and determine faulty line, fault type and failure pole, and can adapt to transition resistance, failure away from
From the variation with the conditions such as power reverses.
The technology of the present invention solution：A kind of multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method, steps are as follows：
Step 101：After calculating alternating current-direct current mixing power distribution network generation direct current intereelectrode short-circuit and monopolar grounding fault, each direct current
The voltage change ratio of circuit current-limiting inductance determines the threshold value of each step of fault detect；
Step 102：According to the voltage change ratio for each DC line current-limiting inductance being calculated in the step 101,
By the voltage change ratio of each DC line current-limiting inductance compared with the failure determination threshold value, alternating current-direct current mixing power distribution network is obtained
Whether the testing result of DC Line Fault is occurred；
Step 103：The testing result that DC Line Fault whether occurs according to alternating current-direct current mixing power distribution network in step 102, will be each
DC line current-limiting inductance voltage change ratio compared with the faulty line recognition threshold, obtain alternating current-direct current mixing power distribution network therefore
Hinder the recognition result of circuit；
Step 104：According to the recognition result of alternating current-direct current mixing distribution network failure circuit in step 103, just by faulty line
Cathode current-limiting inductance voltage change ratio makes the difference, and with fault type recognition threshold value comparison, obtain alternating current-direct current mixing distribution network failure
The recognition result of type；
Step 105：According to the recognition result of alternating current-direct current mixing distribution network failure type in step 104, just by faulty line
Cathode current-limiting inductance voltage change ratio makes the difference, and compared with the judgment threshold of the failure pole, judges that alternating current-direct current mixing power distribution network is straight
Flow failure pole.
Each step is described as follows：
1. in the step 101, after direct current intereelectrode short-circuit and monopolar grounding fault occur for alternating current-direct current mixing power distribution network, each item
The voltage change ratio of DC line current-limiting inductance is acquired by formula (1)-(2)：
Wherein, Ucl1pp、Ucl1pgRespectively intereelectrode short-circuit failure and DC line current-limiting inductance electricity when monopolar grounding fault
Pressure, U01、I01The respectively initial value of direct current voltage across poles and DC line electric current.δ1=R14/L1,β1=arctan (ω1/δ1), L1=2 (L14+Lcl1), R2=R14+Rf, L2=L14+Lcl1。
RfFor the transition resistance of monopolar grounding fault, Lcl1For failure DC line current-limiting inductance, C1For the DC side electricity of failure current conversion station
Hold, R14、L14Respectively failure current conversion station to fault point DC line equivalent resistance and inductance.
2. in the step 101, after direct current intereelectrode short-circuit and monopolar grounding fault occur for alternating current-direct current mixing power distribution network, failure
The threshold value for detecting each step includes：Failure determination threshold value, faulty line recognition threshold, fault type recognition threshold value and failure pole are sentenced
Disconnected threshold value.
3. in the step 102, each DC line current-limiting inductance voltage change ratio sentencing compared with failure determination threshold value
Disconnected formula is：
Wherein, i is the number of each current-limiting inductance, UcliFor each current conversion station DC line current-limiting inductance voltage, dUthd/ dt is
Failure determination threshold value.
4. in the step 103, each DC line current-limiting inductance voltage change ratio is compared with faulty line recognition threshold
Judgment formula be：
Wherein, i is the number of each current-limiting inductance, UcliFor each current conversion station DC line current-limiting inductance voltage, dUthl/ dt is
Faulty line recognition threshold.
5. in the step 104, faulty line positive and negative anodes current-limiting inductance voltage change ratio is made the difference, and know with fault type
The judgment formula of other threshold value comparison is：
Wherein, i is the number of each current-limiting inductance, Uclip、UclinRespectively current conversion station DC line current-limiting inductance anode and negative
Pole tension, dUtht/ dt is fault type recognition threshold value.
6. in the step 105, faulty line positive and negative anodes current-limiting inductance voltage change ratio is made the difference, and judge with failure pole
The judgment formula of threshold value comparison is：
Wherein, i is the number of each current-limiting inductance, Uclip、UclinRespectively current conversion station DC line current-limiting inductance anode and negative
Pole tension, dUthp/ dt is failure pole judgment threshold.
The advantages of the present invention over the prior art are that：The present invention is based on to the event of multiterminal alternating current-direct current mixing power distribution network direct current
The analysis and calculating of failure current conversion station and non-faulting current conversion station current-limiting inductance voltage change ratio when barrier, it is proposed that one kind can be quick
The accurate fault detection method for carrying out fault detect, faulty line identification, fault type recognition and failure pole and judging, calculates letter
Single, detection is accurately, it can be achieved that the detection of multiterminal alternating current-direct current mixing power distribution network DC Line Fault, is system control strategy and protection scheme
Design lay the foundation, be conducive to the isolation and fault recovery of system dc failure, and the present invention not by transition resistance, failure away from
From the influence with current conversion station power reverses, it can ensure computational accuracy in various faults.
Description of the drawings
Fig. 1 is DC Line Fault detection method flow chart of the present invention；
Fig. 2 is that multiterminal radiate shape alternating current-direct current mixing power distribution network direct current intereelectrode short-circuit fault equivalence circuit diagram.
Specific implementation mode
It is further illustrated the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is DC Line Fault detection method flow chart of the present invention.As shown in Figure 1, the present invention comprises the steps of：101, it counts
After calculating alternating current-direct current mixing power distribution network generation direct current intereelectrode short-circuit and monopolar grounding fault, the voltage of each DC line current-limiting inductance
Change rate determines the threshold value of each step of fault detect；102, it is limited according to each DC line being calculated in the step 101
The voltage change ratio of galvanic electricity sense, by the voltage change ratio of each DC line current-limiting inductance compared with the failure determination threshold value,
Obtain the testing result whether alternating current-direct current mixing power distribution network occurs DC Line Fault；103, matched according to alternating current-direct current mixing in step 102
Whether power grid occurs the testing result of DC Line Fault, by each DC line current-limiting inductance voltage change ratio and the faulty line
Recognition threshold compares, and obtains the recognition result of alternating current-direct current mixing distribution network failure circuit；104, mixed according to alternating current-direct current in step 103
The recognition result for closing distribution network failure circuit, faulty line positive and negative anodes current-limiting inductance voltage change ratio is made the difference, and and failure classes
Type recognition threshold compares, and obtains the recognition result of alternating current-direct current mixing distribution network failure type；105, according to alternating current-direct current in step 104
Mix distribution network failure type recognition result, faulty line positive and negative anodes current-limiting inductance voltage change ratio is made the difference, and with it is described
Failure pole judgment threshold compares, and judges alternating current-direct current mixing power distribution network DC Line Fault pole.
1. step 101：After calculating alternating current-direct current mixing power distribution network generation direct current intereelectrode short-circuit and monopolar grounding fault, each item is straight
The voltage change ratio of Flow Line current-limiting inductance determines the threshold value of each step of fault detect：
Fig. 2 is that multiterminal radiate shape alternating current-direct current mixing power distribution network direct current intereelectrode short-circuit fault equivalence circuit diagram.System is by the change of current
DC bus capacitor, DC line equivalent resistance, DC line equivalent inductance, the DC line current-limiting inductance of standing form.Wherein, i is
The number of current conversion station 1,2,3, C1201a、C2201b、C3201c is each current conversion station DC bus capacitor, Lcl1202a、Lcl2202b、
Lcl3202c is each DC line current-limiting inductance, R14203a、L14204a is respectively AC line of the failure current conversion station 1 to fault point
Road equivalent resistance and inductance, R20203b、L20204b is respectively DC line etc. of the current conversion station 2 to each current conversion station points of common connection
Imitate resistance and inductance, R30203c、L30204c is respectively DC line equivalent electricity of the current conversion station 3 to each current conversion station points of common connection
Resistance and inductance.R04205 be fault point to the DC line equivalent resistance of each current conversion station points of common connection, L04206 for fault point extremely
The DC line equivalent inductance of each current conversion station points of common connection.
Can obtain each current conversion station DC capacitor discharge loop differential equation by Fig. 2 is：
Wherein, i is the number of current conversion station 1,2,3, UdciFor each current conversion station DC capacitor voltage, ippiFor each current conversion station direct current
Capacitance discharge current.
After can obtaining intereelectrode short-circuit failure by formula (1), the expression formula of 1 DC line current-limiting inductance of failure current conversion station is：
Wherein, U01、I01The respectively initial value of direct current voltage across poles and DC line electric current.δ1=R14/L1, β1=arctan (ω1/δ1), L1=2 (L14+Lcl1), R2=R14+Rf, L2=L14+Lcl1。
After can obtaining intereelectrode short-circuit failure by formula (2), the expression formula of 1 DC line current-limiting inductance voltage of failure current conversion station is：
After intereelectrode short-circuit failure can be obtained by formula (3), the expression of 1 DC line current-limiting inductance voltage change ratio of failure current conversion station
Formula is：
Wherein, Ucl1ppFor intereelectrode short-circuit failure when DC line current-limiting inductance voltage.
Similarly, after can obtaining monopolar grounding fault, the expression formula of 1 DC line current-limiting inductance voltage of failure current conversion station is：
Wherein, R2=R14+Rf, L2=L14+Lcl1, RfFor the transition resistance of monopolar grounding fault.
After monopolar grounding fault being obtained by formula (5), the expression of 1 DC line current-limiting inductance voltage change ratio of failure current conversion station
Formula is：
Wherein, Ucl1pgFor monopolar grounding fault when DC line current-limiting inductance voltage.
Failure determination threshold value dU is can determine according to formula (4), (7)thd/ dt, faulty line recognition threshold dUthl/ dt, failure
Type identification threshold value dUtht/ dt and failure pole judgment threshold dUthp/dt。
2. step 102：According to the voltage change for each DC line current-limiting inductance being calculated in the step 101
Rate obtains alternating current-direct current mixing and matches by the voltage change ratio of each DC line current-limiting inductance compared with the failure determination threshold value
Whether power grid occurs the testing result of DC Line Fault：
Fault detect judgment formula is represented by：
Wherein, dUthd/ dt is failure determination threshold value, and i represents the number of each current-limiting inductance.When any current-limiting inductance in system
On failure detector detect its voltage change ratio be more than setting threshold value when, decision-making system occur DC Line Fault.The event
Barrier detection criteria is simple, judges that speed is fast, and carries out DC Line Fault detection using one-terminal data, is not influenced by communication delay.
3. step 103：The testing result of DC Line Fault whether occurs according to alternating current-direct current mixing power distribution network in step 102, it will
Each DC line current-limiting inductance voltage change ratio obtains alternating current-direct current mixing power distribution network compared with the faulty line recognition threshold
The recognition result of faulty line：
Faulty line identifies that judgment formula is：
Wherein, dUthl/ dt is preset faulty line recognition threshold.When formula (9) condition meets, i.e. certain circuit
When current-limiting inductance voltage change ratio is more than threshold value, judgement i-th line road is faulty line.After occurring due to failure, faulty line
The voltage change ratio of current-limiting inductance can increase sharply, therefore, this method can quickly recognize faulty line, meet straight-flow system
Requirement to faulty line identification.
4. step 104：According to the recognition result of alternating current-direct current mixing distribution network failure circuit in step 103, by faulty line
Positive and negative anodes current-limiting inductance voltage change ratio makes the difference, and with fault type recognition threshold value comparison, obtain alternating current-direct current mixing power distribution network therefore
Hinder the recognition result of type：
Fault type recognition judgment formula is：
Wherein, Uclip、UclinRespectively faulty line anode, cathode current-limiting inductance voltage, dUtht/ dt knows for fault type
Other threshold value.When the absolute value of the anode of faulty line and cathode current-limiting inductance voltage change ratio difference is less than threshold value, judgement event
Barrier is intereelectrode short-circuit failure.When the anode of faulty line and the absolute value of cathode current-limiting inductance voltage change ratio difference are more than or equal to
When threshold value, judgement failure is monopolar grounding fault.
5. step 105：According to the recognition result of alternating current-direct current mixing distribution network failure type in step 104, by faulty line
Positive and negative anodes current-limiting inductance voltage change ratio makes the difference, and compared with the judgment threshold of the failure pole, judges alternating current-direct current mixing power distribution network
DC Line Fault pole：
Failure pole judgment formula is as follows：
Wherein, dUthp/ dt is failure pole decision threshold.When the amplitude and cathode of positive circuit current-limiting inductance voltage change ratio
When the amplitude difference of circuit current-limiting inductance voltage change ratio is more than threshold value, it is determined as plus earth failure.When the difference in magnitude of the two
Value be negative, and be less than threshold value when, be determined as cathode earth fault.The setting of the threshold value can avoid the interference such as system noise, and
There are enough failure poles to judge nargin.
The detection of multiterminal alternating current-direct current mixing power distribution network DC Line Fault, faulty line can be realized according to formula (8)-(11)
Identification, the identification of fault type and the judgement of failure pole.
Claims (6)
1. a kind of multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method, it is characterised in that：The fault detection method packet
Containing following steps：
Step 101：After calculating alternating current-direct current mixing power distribution network generation direct current intereelectrode short-circuit and monopolar grounding fault, each DC line
The voltage change ratio of current-limiting inductance determines that dependent thresholds, the dependent thresholds include fault detect according to the voltage change ratio
Threshold value, faulty line recognition threshold, fault type recognition threshold value and failure pole judgment threshold；
Step 102：It, will be each according to the voltage change ratio for each DC line current-limiting inductance being calculated in the step 101
Whether the voltage change ratio of DC line current-limiting inductance obtains alternating current-direct current mixing power distribution network compared with the failure determination threshold value
The testing result of DC Line Fault occurs；
Step 103：The testing result of DC Line Fault whether occurs according to alternating current-direct current mixing power distribution network in step 102, each item is straight
Flow Line current-limiting inductance voltage change ratio obtains alternating current-direct current mixing distribution network failure line compared with the faulty line recognition threshold
The recognition result on road；
Step 104：According to the recognition result of alternating current-direct current mixing distribution network failure circuit in step 103, by faulty line positive and negative anodes
Current-limiting inductance voltage change ratio makes the difference, and with fault type recognition threshold value comparison, obtain alternating current-direct current mixing distribution network failure type
Recognition result；
Step 105：According to the recognition result of alternating current-direct current mixing distribution network failure type in step 104, by faulty line positive and negative anodes
Current-limiting inductance voltage change ratio makes the difference, and compared with the judgment threshold of the failure pole, judges the event of alternating current-direct current mixing power distribution network direct current
Hinder pole.
2. multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method according to claim 1, it is characterised in that：It is described
Step 101 in alternating current-direct current mixing power distribution network DC Line Fault after, the calculation formula of DC line current-limiting inductance voltage change ratio；
Wherein, λ1,2For intermediate variable, Ucl1pp、Ucl1pgRespectively intereelectrode short-circuit failure and DC line limits when monopolar grounding fault
Flow inductive drop, U01、I01The respectively initial value of direct current voltage across poles and DC line electric current, δ1=R14/L1,β1=arctan (ω1/δ1), L1=2 (L14+Lcl1), R2=R14+Rf, L2=L14+
Lcl1, RfFor the transition resistance of monopolar grounding fault, Lcl1For failure DC line current-limiting inductance, C1For the direct current of failure current conversion station
Lateral capacitance, R14、L14Respectively failure current conversion station to fault point DC line equivalent resistance and inductance.
3. multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method according to claim 1, it is characterised in that：It is described
In step 102, judgment formula of each DC line current-limiting inductance voltage change ratio compared with failure determination threshold value is：
Wherein, i is the number of each DC line current-limiting inductance, UcliFor each DC line current-limiting inductance voltage, dUthd/dt
For failure determination threshold value.
4. multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method according to claim 1, it is characterised in that：It is described
In step 103, judgment formula of each DC line current-limiting inductance voltage change ratio compared with faulty line recognition threshold is：
Wherein, i is the number of each DC line current-limiting inductance, UcliFor each DC line current-limiting inductance voltage, dUthl/dt
For faulty line recognition threshold.
5. multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method according to claim 1, it is characterised in that：It is described
In step 104, faulty line positive and negative anodes current-limiting inductance voltage change ratio is made the difference, and sentenced with fault type recognition threshold value comparison
Disconnected formula is：
Wherein, i is the number of each DC line current-limiting inductance, Uclip、UclinRespectively each DC line current-limiting inductance anode
And cathode voltage, dUtht/ dt is fault type recognition threshold value.
6. multiterminal alternating current-direct current mixing power distribution network DC Line Fault detection method according to claim 1, it is characterised in that：It is described
In step 105, faulty line positive and negative anodes current-limiting inductance voltage change ratio is made the difference, and the judgement compared with the judgment threshold of failure pole
Formula is：
Wherein, i is the number of each DC line current-limiting inductance, Uclip、UclinRespectively each DC line current-limiting inductance anode
And cathode voltage, dUthp/ dt is failure pole judgment threshold.
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| CN112736864A (en) * | 2020-12-11 | 2021-04-30 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current line protection method and system based on voltage Euclidean distance |
| CN114062838A (en) * | 2021-10-29 | 2022-02-18 | 深圳供电局有限公司 | Direct-current wiring fault positioning method and device and medium-voltage direct-current power distribution equipment |
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