CN108872791B - The single-phase high-impedance of low resistance grounding power distribution network identifies and guard method - Google Patents
The single-phase high-impedance of low resistance grounding power distribution network identifies and guard method Download PDFInfo
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- CN108872791B CN108872791B CN201810753191.7A CN201810753191A CN108872791B CN 108872791 B CN108872791 B CN 108872791B CN 201810753191 A CN201810753191 A CN 201810753191A CN 108872791 B CN108872791 B CN 108872791B
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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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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of single-phase high-impedance recognition methods of low resistance grounding power distribution network; when single-phase high-impedance occurs according to low resistance grounding power distribution network, the maximum zero sequence virtual power variable quantity that non-faulting feeder line is likely to occur determines protection seting value Δ Pset；Each phase zero sequence virtual power variable quantity of each feeder line is calculated with zero sequence virtual power when failure according to zero sequence virtual power before failure；By each phase zero sequence virtual power variable quantity of each feeder line and protection seting value Δ PsetIt is compared, when certain phase zero sequence virtual power variable quantity of a certain feeder line is greater than or equal to protection seting value Δ PsetWhen, then determine that single-phase high-impedance occurs for the feeder line.A kind of electric network protection method is also disclosed, the feeder line that single-phase high-impedance occurs is identified using method of the invention；Safeguard measure is taken for fault feeder.The present invention solves the low technical problem of recognition methods reliability in the prior art, the influence of meter and direct-to-ground capacitance parameter unbalance degree, sensitivity with higher and reliability.
Description
Technical field
The present invention relates to field of relay protection in power, and in particular to a kind of single-phase high resistant of low resistance grounding power distribution network
Ground fault recognition method further relates to a kind of guard method of low resistance grounding power distribution network.
Background technique
With cable being widely used in urban power distribution network, system capacitive earth current constantly increases, single-phase earthing event
Hinder electric current to increase, electric arc is not easy to extinguish, and is easy to produce intermittent arc grounding overvoltage.Earth-free mode and grounding through arc
Mode cannot solve problem above very well.Low resistance grounding power distribution network assigns neutral point of electric network, and through small resistance, (resistance value is in 30 Ω
Within) be grounded, low resistance grounding mode becomes because having the characteristics that singlephase earth fault overvoltage level is low, protection is simple
The main neutral grounding mode of urban power distribution network based on cable.
Singlephase earth fault is the major failure form of power grid, and single-phase high-impedance is one in singlephase earth fault
Kind, also failure is failure problems more outstanding in low resistance grounding power distribution network to single-phase high resistance ground.When neutral point is through small resistance
When single-phase high-impedance occurs for the power distribution network of ground connection, fault characteristic value very little and vulnerable to line capacitance electric current and over the ground
The influence of parameter unbalance.It is main at present to be connect using zero-sequence over-current protection and zero sequence power direction protection to identify that power distribution network is single-phase
Earth fault.Zero-sequence over-current protection definite value need to reliably escape out-of-area line road and pair for flowing through route in area when metallic earthing failure occurs
Ground capacitance current, definite value is higher, and being widely used for cable further improves protection definite value in feeder line, weakens zero sequence overcurrent
Protect the sensitivity to high resistance earthing fault.Zero sequence power direction protection, which has, preferably reflects transition resistance ability, but due to
Residual voltage, electric current polarity verify it is difficult, and when high resistance earthing fault for judge the residual voltage amplitude of power direction compared with
Small, there are protection's dead-zones.The reliability of the single-phase high resistance ground of power distribution network identifies and excision is always the problem of electric power netting safe running.
When single-phase high-impedance occurs, existing protection is difficult to and cuts off failure, easily causes personal electric shock
Or cause fire incident.Therefore, seek a kind of protection of low resistance grounding power distribution network single-phase high-impedance to be beneficial to be promoted
The general safety performance of distribution system.For this problem, domestic and international researcher has carried out numerous studies.But the emphasis of research
It is to extract the harmonic characteristic of high resistance earthing fault using Short Time Fourier Transform, wavelet transform, neural network algorithm etc.
Amount is to identify single-phase high-impedance, but its applicability is limited.There is scholar to attempt to introduce residual voltage as braking amount, according to
Braking amount adjusts zero-sequenceprotection definite value adaptively to improve the performance of zero-sequence over-current protection, or is sentenced by constructing corresponding protection
Reach identification single-phase high-impedance accordingly, but the above method does not consider that parameter unbalance identifies single-phase high resistant over the ground
Influence.There is scholar to propose to utilize existing distribution power automation terminal equipment metering current, voltage, power quality, abnormal signal, humorous
The parameters such as wave construct corresponding identical criterion and realize high resistive fault detection, but propose higher want to distribution automation level
It asks.
In conclusion low resistance grounding power distribution network single-phase high-impedance is difficult to effectively identify and protection seriously affects and is
System security performance, but existing single-phase high-impedance recognition methods and protection exist not in terms of reliability and adaptability
Foot, and the influence of parameter unbalance over the ground is not considered.How low resistance grounding power distribution network single-phase high resistance ground event is accurately identified
Barrier, and there has been no feasible technical solutions at present for guard method of the formation with higher reliability and adaptability.
Summary of the invention
In view of the above shortcomings of the prior art, the present invention provides a kind of single-phase high resistance ground event of low resistance grounding power distribution network
Hinder recognition methods, solves the low technical problem of single-phase high-impedance recognition methods reliability in the prior art, Neng Gouji
And the influence of direct-to-ground capacitance parameter unbalance degree, sensitivity with higher and reliability.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions: a kind of low resistance grounding power distribution network
Single-phase high-impedance recognition methods, comprising the following steps:
Step 1: when single-phase high-impedance occurs according to low resistance grounding power distribution network, non-faulting feeder line is likely to occur
Maximum zero sequence virtual power variable quantity determines protection seting value Δ Pset；
Step 2: zero sequence virtual power before each phase fault of each feeder line when calculating low resistance grounding power distribution network normal operation, and
Zero sequence virtual power when calculating each phase fault of each feeder line when failure occurs；
Step 3: calculating each phase zero sequence of each feeder line with zero sequence virtual power when failure according to zero sequence virtual power before failure
Virtual power variable quantity；
Step 4: by each phase zero sequence virtual power variable quantity of each feeder line and protection seting value Δ PsetIt is compared, when certain
Certain phase zero sequence virtual power variable quantity of one feeder line is greater than or equal to protection seting value Δ PsetWhen, then it is single to determine that the feeder line occurs
Phase high resistance earthing fault.
Preferably, protection seting value Δ P is determined in accordance with the following stepsset:
Step 101: assuming that any non-faulting feeder line j can when single-phase high-impedance occurs for low resistance grounding power distribution network
The maximum for the zero sequence virtual power variable quantity that can occur is Δ Pj, as follows:
Wherein, ω is angular frequency；CjFor the three relatively total capacitances of feeder line j；EmFor small resistance grounding system specified phase voltageAmplitude；AρFor vectorMould, θρFor vectorPhase angle,It is not right for feeder line j direct-to-ground capacitance parameter
Title degree；AΓFor phasorMould, θΓFor phasorPhase angle；For phasor relevant to transition conductance,Subscript * indicates that the conjugate operation of phasor, j indicate the imaginary part unit of plural number,Indicate the degree of asymmetry of small resistance grounding system three-phase ground capacitance parameter；r0For the small resistance of neutral point, GfIndicate single-phase
Transition conductance when ground connection, Gf=0；
Step 102: the maximum value in the maximum for the zero sequence virtual power variable quantity being likely to occur with non-faulting feeder line is made
For protection seting value Δ Pset, as follows: Δ Pset=Krelmax(ΔPj)；Wherein, KrelFor safety factor.
Preferably, to the protection seting value Δ P in step 102setCalculation formula in max (Δ Pj) deformed, it obtains
To following formula:
Wherein, max (θΓ-θρ)=θ1+θ2, θ1、θ2Indicate variable relevant to direct-to-ground capacitance parameter, as follows:
Wherein, ICFor small resistance grounding system capacitance current；CjFor the three relatively total capacitances of feeder line j；
Calculating protection seting value Δ PsetWhen, maximum value, which is chosen, from the three of each feeder line relatively total capacitance is calculated,
Max (Δ P can once be calculatedj)。
The present invention also provides a kind of guard methods of low resistance grounding power distribution network, are connect first using small resistance of the invention
The single-phase high-impedance recognition methods of ground power distribution network identifies the feeder line that single-phase high-impedance occurs；Then, for
The feeder line that single-phase high-impedance occurs takes safeguard measure.
Compared with prior art, the invention has the following advantages:
1, present invention is specifically directed to be identified in the single-phase high-impedance of low resistance grounding power distribution network, structure of the present invention
Zero sequence virtual power variable quantity is built as protection feature amount to reflect power distribution network single-phase high-impedance, it is virtual using zero sequence
When power variation carries out the adjusting of protection value as protection feature amount, when determining protection seting value, it is contemplated that direct-to-ground capacitance
The influence that parameter and its degree of asymmetry identify single-phase high-impedance, so that the sensitivity of protection feature amount is improved, therefore,
Compared in the prior art using zero-sequence over-current protection as protection feature amount, the sensitivity of fault identification is improved.In addition, zero
Sequence virtual power variable quantity combines the variation of phase voltage and zero-sequence current, is exaggerated single-phase high-impedance feature, and existing
There is the zero sequence power direction protection in technology to compare, avoid the difficult problem of polarity verification, to improve being applicable in for protection
The reliability of property and fault identification.
2, electrical quantity needed for protection feature amount is only each feeder line zero-sequence current and phase voltage information before and after failure, is easy to
It is realized in low resistance grounding power distribution network.By each phase zero sequence virtual power variable quantity of each feeder line and protection seting value Δ PsetIt carries out
Compare, maximum virtual power variable quantity is selected without the zero sequence virtual power variable quantity between more each phase, to avoid
Data communication is carried out between each phase in feeder line, reduces the hardware configuration requirement of system.
3, the present invention provides the methods of two kinds of determining protection seting values: one is first ask each non-faulting feeder line to be likely to occur
Zero sequence virtual power variable quantity maximum, then therefrom select maximum value as protection seting value Δ P againset；Another kind is
Maximum value is chosen from the three of each feeder line relatively total capacitance to be calculated, and can be once calculated, can be reduced calculation amount.
4, due to can accurately and reliably identify single-phase height occurs for the guard method of low resistance grounding power distribution network of the invention
Therefore the feeder line of resistance ground fault can targetedly take measures, improve the accuracy of protection act, improve power grid security
Property.
Detailed description of the invention
The structural schematic diagram of low resistance grounding power distribution network when Fig. 1 is up；
Fig. 2 is the structural schematic diagram of low resistance grounding power distribution network when single-phase high-impedance occurs.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, in present embodiment low resistance grounding power distribution network structural schematic diagram, have 5 feeder lines in figure,
I=1,2 ..., 5, each feed line have A, B, C three-phase,A phase busbar voltage, B respectively before failure
Phase busbar voltage, C phase busbar voltage, r0For the small resistance for neutral ground.Line parameter circuit value such as the following table 1:
1 line parameter circuit value of table
A kind of single-phase high-impedance recognition methods of low resistance grounding power distribution network, comprising the following steps:
Step 1: when single-phase high-impedance occurs according to low resistance grounding power distribution network, non-faulting feeder line is likely to occur
Maximum zero sequence virtual power variable quantity determines protection seting value Δ Pset；
Step 2: zero sequence virtual power before each phase fault of each feeder line when calculating low resistance grounding power distribution network normal operation, and
Zero sequence virtual power when calculating each phase fault of each feeder line when failure occurs；
Step 3: calculating each phase zero sequence of each feeder line with zero sequence virtual power when failure according to zero sequence virtual power before failure
Virtual power variable quantity；
Step 4: by each phase zero sequence virtual power variable quantity of each feeder line and protection seting value Δ PsetIt is compared, when certain
Certain phase zero sequence virtual power variable quantity of one feeder line is greater than or equal to protection seting value Δ PsetWhen, then it is single to determine that the feeder line occurs
Phase high resistance earthing fault.
Two methods can be used to determine protection seting value: one is the zero sequence for first asking each non-faulting feeder line to be likely to occur void
The maximum of quasi- power variation, then therefrom selects maximum value as protection seting value Δ P againset, as follows: step
101: assuming that when single-phase high-impedance occurs for low resistance grounding power distribution network, zero sequence that any non-faulting feeder line j is likely to occur
The maximum of virtual power variable quantity is Δ Pj, as follows:
Wherein, ω is angular frequency；CjFor the three relatively total capacitances of feeder line j；EmFor small resistance grounding system specified phase voltageAmplitude；AρFor vectorMould, θρFor vectorPhase angle,It is not right for feeder line j direct-to-ground capacitance parameter
Title degree；AΓFor phasorMould, θΓFor phasorPhase angle；For phasor relevant to transition conductance,Subscript * indicates that the conjugate operation of phasor, j indicate the imaginary part unit of plural number,Indicate the degree of asymmetry of small resistance grounding system three-phase ground capacitance parameter, relatively parameter need to be kept the three of power grid as far as possible
It is unanimously excessive to avoid neutral point voltage, therefore the degree of asymmetry of three-phase ground capacitance parameterMouldValue range is generallyExtreme case is considered in present embodiment,Therefore, fault identification can be sufficiently ensured
Reliability；r0For the small resistance of neutral point, GfIndicate transition conductance when single-phase earthing, Gf=0；
Step 102: the maximum value in the maximum for the zero sequence virtual power variable quantity being likely to occur with non-faulting feeder line is made
For protection seting value Δ Pset, as follows: Δ Pset=Krelmax(ΔPj)；Wherein, KrelFor safety factor.
Another kind is to choose maximum value from the three of each feeder line relatively total capacitance to be calculated, and can once be calculated
It arrives, it can be to calculation amount be reduced, specifically: to the protection seting value Δ P in step 102setCalculation formula in max (Δ
Pj) deformed, obtain following formula:
Wherein, max (θΓ-θρ)=θ1+θ2, θ1、θ2Indicate variable relevant to direct-to-ground capacitance parameter, as follows:
Wherein, ICFor small resistance grounding system capacitance current；CjFor the three relatively total capacitances of feeder line j；
Calculating protection seting value Δ PsetWhen, maximum value, which is chosen, from the three of each feeder line relatively total capacitance is calculated,
Max (Δ P can once be calculatedj).Such calculation is selected in present embodiment, then then selecting from table 1
Relatively total capacitance is calculated the three of feeder line 2, is obtained It is maximized 0.05, Em=
8.165×103V, IC=64.4A, r0=10 Ω, Krel=1.5, so that protection seting value Δ P be calculatedset=7.74 ×
103。
In present embodiment, in step 2, each mutually event of low resistance grounding power distribution network any feeder line i when operating normally
Zero sequence virtual power is calculated as follows before hindering:
Zero sequence virtual power P before A phase faultinA:
Zero sequence virtual power P before B phase faultinB:
Zero sequence virtual power P before C phase faultinC:
Wherein, subscript * indicates the conjugate operation of vector；Re expression takes real part；The zero sequence electricity of feeder line i before expression failure
Stream, direction are to flow to bus；A phase busbar voltage, B phase busbar voltage, C phase bus electricity respectively before failure
Pressure；
As shown in Fig. 2, when failure occurs low resistance grounding power distribution network structural schematic diagram, in figure,
Respectively failure when A phase busbar voltage, B phase busbar voltage, C phase busbar voltage.
Zero sequence virtual power is calculated as follows failure when each phase fault of any feeder line i when occurring:
Zero sequence virtual power P when A phase faultifA:
Zero sequence virtual power P when B phase faultifB:
Zero sequence virtual power P when C phase faultifC:
Wherein,Indicate the zero-sequence current of feeder line i when failure, direction is to flow to bus； Respectively
A phase busbar voltage, B phase busbar voltage, C phase busbar voltage when for failure.
In present embodiment, each phase zero sequence virtual power variable quantity of any feeder line i is counted as follows in step 3
It calculates:
Zero sequence virtual power variation delta P when A phase faultiA: Δ PiA=PifA-PinA；
Zero sequence virtual power variation delta P when B phase faultiB: Δ PiB=PifB-PinB；
Zero sequence virtual power variation delta P when C phase faultiC: Δ PiC=PifC-PinC；
As Δ PiA、ΔPiB、ΔPiCIn any one be greater than or equal to protection seting value Δ PsetWhen, then it represents that feeder line i
Single-phase high-impedance occurs.
In present embodiment, each each phase zero sequence virtual power variable quantity of feeder line is as shown in table 2:
Each feeder line zero sequence virtual power variable quantity of table 2
As seen from the table, the A phase zero sequence virtual power variation delta P of feeder line 1iA=29.08 × 103, then Δ PiA≥Δ
Pset, that is, judge that single-phase high-impedance occurs for feeder line 1.
A kind of guard method of low resistance grounding power distribution network, first using the single-phase of low resistance grounding power distribution network of the invention
High resistance earthing fault recognition methods identifies the feeder line that single-phase high-impedance occurs；Then, it is connect for the single-phase high resistant of generation
The feeder line of earth fault takes safeguard measure.
The present invention forms feeder line zero sequence virtual power using bus phase voltage and feeder line zero-sequence current, with feeder line before and after failure
Zero sequence virtual power variable quantity is as protection feature amount, when zero sequence virtual power variable quantity is greater than protection seting value, that is, can determine that
Singlephase earth fault occurs for respective feed connection.Meter and feeder line direct-to-ground capacitance parameter size of the present invention and direct-to-ground capacitance parameter unbalance
The influence of degree, principle is simple, and required electrical quantity is only each feeder line zero-sequence current and each phase voltage information of bus before and after failure,
It is easy to realize in low resistance grounding power distribution network.This method is obvious to the division limits of single-phase high-impedance inside and outside area, tool
There are higher sensitivity and reliability.
Claims (5)
1. a kind of single-phase high-impedance recognition methods of low resistance grounding power distribution network, it is characterised in that: the following steps are included:
Step 1: when single-phase high-impedance occurs according to low resistance grounding power distribution network, maximum that non-faulting feeder line is likely to occur
Zero sequence virtual power variable quantity determines protection seting value Δ Pset；
Step 2: zero sequence virtual power before each phase fault of each feeder line when calculating low resistance grounding power distribution network normal operation, and calculate
Zero sequence virtual power when each phase fault of each feeder line when failure generation；
Step 3: each phase zero sequence for calculating each feeder line according to zero sequence virtual power before failure and zero sequence virtual power when failure is virtual
Power variation；
Step 4: by each phase zero sequence virtual power variable quantity of each feeder line and protection seting value Δ PsetIt is compared, when a certain feedback
Certain phase zero sequence virtual power variable quantity of line is greater than or equal to protection seting value Δ PsetWhen, then determine that single-phase height occurs for the feeder line
Hinder ground fault；
Protection seting value Δ P is determined in accordance with the following stepsset:
Step 101: assuming that any non-faulting feeder line j may go out when single-phase high-impedance occurs for low resistance grounding power distribution network
The maximum of existing zero sequence virtual power variable quantity is Δ Pj, as follows:
Wherein, ω is angular frequency；CjFor the three relatively total capacitances of feeder line j；EmFor small resistance grounding system specified phase voltage's
Amplitude；AρFor vectorMould, θρFor vectorPhase angle,For feeder line j direct-to-ground capacitance parameter unbalance
Degree；AΓFor phasorMould, θΓFor phasorPhase angle；For phasor relevant to transition conductance,Subscript * indicates that the conjugate operation of phasor, j indicate the imaginary part unit of plural number,Indicate the degree of asymmetry of small resistance grounding system three-phase ground capacitance parameter, r0For the small resistance of neutral point, GfIndicate single-phase
Transition conductance when ground connection, Gf=0；
Step 102: maximum value in the maximum for the zero sequence virtual power variable quantity being likely to occur using non-faulting feeder line is as protecting
Protect setting valve Δ Pset, as follows: Δ Pset=Krelmax(ΔPj)；Wherein, KrelFor safety factor.
2. the single-phase high-impedance recognition methods of low resistance grounding power distribution network according to claim 1, feature exist
In: to the protection seting value Δ P in step 102setCalculation formula in max (Δ Pj) deformed, obtain following formula:
Wherein, max (θΓ-θρ)=θ1+θ2, θ1、θ2Indicate variable relevant to direct-to-ground capacitance parameter, as follows:
Wherein, ICFor small resistance grounding system capacitance current；CjFor the three relatively total capacitances of feeder line j；
Calculating protection seting value Δ PsetWhen, maximum value, which is chosen, from the three of each feeder line relatively total capacitance is calculated
Max (Δ P is once calculatedj)。
3. the single-phase high-impedance recognition methods of low resistance grounding power distribution network according to claim 1, feature exist
In: in step 2, when low resistance grounding power distribution network operates normally before each phase fault of any feeder line i zero sequence virtual power by as follows
Formula calculates:
Zero sequence virtual power P before A phase faultinA:
Zero sequence virtual power P before B phase faultinB:
Zero sequence virtual power P before C phase faultinC:
Wherein, subscript * indicates the conjugate operation of vector；Re expression takes real part；The zero-sequence current of feeder line i before expression failure,
Direction is to flow to bus；A phase busbar voltage, B phase busbar voltage, C phase busbar voltage respectively before failure；
Zero sequence virtual power is calculated as follows failure when each phase fault of any feeder line i when occurring:
Zero sequence virtual power P when A phase faultifA:
Zero sequence virtual power P when B phase faultifB:
Zero sequence virtual power P when C phase faultifC:
Wherein,Indicate the zero-sequence current of feeder line i when failure, direction is to flow to bus； Respectively event
A phase busbar voltage, B phase busbar voltage, C phase busbar voltage when barrier.
4. the single-phase high-impedance recognition methods of low resistance grounding power distribution network according to claim 1, feature exist
In: each phase zero sequence virtual power variable quantity of any feeder line i is calculated as follows in step 3:
Zero sequence virtual power variation delta P when A phase faultiA: Δ PiA=PifA-PinA；
Zero sequence virtual power variation delta P when B phase faultiB: Δ PiB=PifB-PinB；
Zero sequence virtual power variation delta P when C phase faultiC: Δ PiC=PifC-PinC；
As Δ PiA、ΔPiB、ΔPiCIn any one be greater than or equal to protection seting value Δ PsetWhen, then it represents that feeder line i occurs
Single-phase high-impedance；Wherein, PinA、PinB、PinCRespectively indicate before A phase fault zero sequence before zero sequence virtual power, B phase fault
Zero sequence virtual power before virtual power, C phase fault；PifA、PifB、PifCZero sequence virtual power, the event of B phase when respectively indicating A phase fault
Zero sequence virtual power when zero sequence virtual power, C phase fault when barrier.
5. a kind of guard method of low resistance grounding power distribution network, it is characterised in that: connect first using the small resistance in claim 1
The single-phase high-impedance recognition methods of ground power distribution network identifies the feeder line that single-phase high-impedance occurs；Then, for
The feeder line that single-phase high-impedance occurs takes safeguard measure.
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| CN112054487B (en) * | 2019-06-05 | 2022-05-03 | 李景禄 | Single-phase earth fault judgment and processing method for direct-distribution new energy power plant |
| CN110456230B (en) * | 2019-08-29 | 2021-04-27 | 国家电网有限公司 | Power distribution network single-phase earth fault processing method based on dual-mode function |
| CN111505438B (en) * | 2020-04-17 | 2022-03-29 | 南京南瑞继保电气有限公司 | Improved self-adaptive feeder automation method |
| CN112858837B (en) * | 2021-01-13 | 2022-04-08 | 清华大学 | Method and device for judging high-resistance fault direction of power transmission line |
| CN113917364B (en) * | 2021-10-09 | 2024-03-08 | 广东电网有限责任公司东莞供电局 | High-resistance grounding identification method and device for power distribution network |
| CN115792400B (en) * | 2023-02-02 | 2023-04-18 | 国网湖北省电力有限公司武汉供电公司 | Method, system and medium for accurately measuring parameters of ungrounded neutral point power distribution network |
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