CN107315128A - A kind of distributed earthing wire-selecting method and system based on GOOSE - Google Patents
A kind of distributed earthing wire-selecting method and system based on GOOSE Download PDFInfo
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- CN107315128A CN107315128A CN201610266157.8A CN201610266157A CN107315128A CN 107315128 A CN107315128 A CN 107315128A CN 201610266157 A CN201610266157 A CN 201610266157A CN 107315128 A CN107315128 A CN 107315128A
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
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- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The present invention discloses a kind of distributed earthing wire-selecting method based on GOOSE, step 1：This line-to-ground fault characteristic quantity calculates；Step 2：Zero sequence CT is monitored and polarity is corrected automatically；Step 3：Earth fault characteristic quantity GOOSE signals are sent to communication network：Step 4：Receive earth fault characteristic quantity GOOSE signals and the Integrated comparative route selection of All other routes.Invention additionally discloses a kind of distributed earthing wire-selecting system based on GOOSE.The present invention can correct zero sequence CT polarity automatically, improve the accuracy rate than phase formula route selection criterion；Zero sequence PT, zero sequence CT can be monitored, influence of the reduction broken string to route selection accuracy rate；Line-selected earthing device need not be increased, it is not necessary to increase cable connection, it is not required that increase communication network wiring.
Description
Technical field
The present invention relates to a kind of earth-fault protection method of power system power transmission and distribution, more particularly to a kind of ground connection choosing
Line method.
Background technology
The system of China's power network 3-66kV voltage class, its neutral point typically uses small current neutral grounding mode, bag
Include isolated neutral, through grounding through arc, through high resistance ground, also known as neutral non-effective grounding mode.
The characteristics of small current neutral grounding system, is, when occurring singlephase earth fault, does not constitute short-circuit loop, fault current
Essentially capacitance current, numerical value is smaller, and the holding that remains unchanged of system three-phase line voltage is symmetrical, interior to normal in short-term
Electricity consumption has no significant effect, and can operate with failure 1-2 hours.Therefore the reliability of system operation is improved.Especially
It is that under the conditions of transient fault, short dot voluntarily can recover insulation by arc extinguishing, and this has a power failure in short-term for reducing user
Number of times has positive effect.
Although small current neutral grounding system reliability is high, when being due to singlephase earth fault, non-faulting phase voltage meeting
Raise as line voltage, operate with failure for a long time, system interior insulation weak link is easily breakdown, causes phase fault
Or three-phase shortcircuit, cause fault coverage to expand, have a strong impact on Supply Security and reliability.Therefore, occur forever
During long property singlephase earth fault, it is necessary to locating bad lines and cut off as early as possible.
When singlephase earth fault occurs for small current neutral grounding system, with short circuit current flow is small, fault signature is unconspicuous
Feature, particularly compensated distribution network, after arc suppression coil is to ground connection condenser current compensation, faulty line
It is more nearly with the electric current of non-fault line, fault signature is not more obvious.Domestic and international years of researches are have passed through,
Have at present than a variety of earthing wire-selecting methods such as width method, phase comparing method, Harmonic Method, transient state component methods, in reality
It is typically necessary in and special Small Electric Current Earthing And Routing Device is separately configured.
All selection methods, no matter based on steady-state quantity or transient, fundamental wave or harmonic wave, two can be classified as
Major class a, class is, than width method, by the amplitude of relatively more each circuit zero-sequence component, to find difference and carry out failure line selection；
One class is phase comparing method, by the phase of relatively more each circuit zero-sequence component, finds difference and carries out failure line selection.Wherein
Phase comparing method requires that the zero sequence CT polarity of each circuit must be consistent, and scene has zero sequence CT polarity and is difficult to what is verified
Problem, causes all selection methods based on phase comparing method to be all restricted；In addition, Small Electric Current Earthing And Routing Device
Due to only accessing zero-sequence current, it can not also be verified in the event of zero sequence CT broken strings, influence route selection accuracy rate；Again
Person, configuration Small Electric Current Earthing And Routing Device needs to increase many cable accesses, and construction volume is very big.Therefore, currently
Small current earthing wire-selecting method and Small Electric Current Earthing And Routing Device exist can improvements.
The content of the invention
The purpose of the present invention is：For small current neutral grounding system, there is provided a kind of distributed ground connection based on GOOSE
Selection method and system, as the characteristic quantity needed for each protection device calculates earthing wire-selecting, and are converted to GOOSE letters
Number shared, realize failure line selection, at the same carried out in protection device zero sequence polarity CT automatically correction and
Disconnection monitoring, improves failure line selection accuracy rate.
In order to reach above-mentioned purpose, solution of the invention is：
A kind of distributed earthing wire-selecting method based on GOOSE, it is characterised in that connect for neutral point is non-effective
Ground system, calculates respective earth fault characteristic quantity, and be converted to respectively by the protection device of each circuit of transformer station
GOOSE signals are shared using communication network, the fault characteristic value identification fault wire of each circuit of Integrated comparative transformer station
Road, specifically includes following steps：
Step 1：The protection device of each circuit of transformer station calculates respective earth fault characteristic quantity；
Step 2：The protection device of each circuit of transformer station carries out zero sequence CT monitorings and polarity is corrected automatically, leads to
The amplitude and polarity of more self-produced zero-sequence current and external zero-sequence current are crossed, monitoring zero sequence CT breaks, and according to
The polarity of self-produced zero-sequence current is modified to phase earth fault characteristic quantity；
Step 3：Earth fault characteristic quantity is converted to GOOSE signals and sent by the protection device of each circuit of transformer station
To communication network；
Step 4：The protection device of each circuit of transformer station receives the earth fault feature of All other routes from communication network
Amount, the earth fault characteristic quantity of Integrated comparative transformer station whole circuit, recognizes faulty line, if faulty line
For circuit where itself, then according to being set for isolated fault of tripping.
Wherein, earth fault characteristic quantity transmission method is characterised by, earth fault characteristic quantity is converted into GOOSE
Signal, is transmitted by station level network or process-level network.
Wherein, zero sequence polarity auto-correction method is characterised by step 2, when earth fault occurs, circuit
Protection device compares self-produced zero-sequence current with external zero-sequence current relative to the phase of self-produced residual voltage automatically, sentences
Whether polarity access is wrong for other zero-sequence current, if polarity is wrong, sends alarm signal, while to ground connection event
The phase property amount of barrier is repaiied automatically on the basis of phase of the self-produced zero-sequence current relative to self-produced residual voltage
Just.
The solution of the present invention also includes a kind of distributed earthing wire-selecting system based on GOOSE, it is characterised in that
It is made up of each line protective devices and communication network of transformer station, each line protective devices pass through communication network phase
Even, the earth fault characteristic quantity of each circuit is shared by GOOSE signals, earthing wire-selecting flow uses claim
Distributed earthing wire-selecting method described in 1.
After such scheme, the beneficial effects of the invention are as follows：
(1) zero sequence CT polarity can be corrected automatically, improve the accuracy rate than phase formula route selection criterion；
(2) zero sequence PT, zero sequence CT can be monitored, influence of the reduction broken string to route selection accuracy rate；
(3) line-selected earthing device need not be increased, it is not necessary to increase cable connection, it is not required that increase communication
Network connection.
Brief description of the drawings
Fig. 1 is the small current neutral grounding system main electrical scheme schematic diagram citing that the present invention is applied；
Fig. 2 is the flow chart of the distributed selection method based on GOOSE of the present invention；
Fig. 3 is the configuration diagram of the distributed wire selection system based on GOOSE of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme is described in detail.
Small current neutral grounding system includes isolated neutral, through grounding through arc, through forms such as high resistance grounds,
Fig. 1 is by taking the typical case of neutral by arc extinction coil grounding as an example.L1-L5 is in the electric power system in Fig. 1
5 circuits, be not limited to 5 in real system.When earth fault occurs, L3 there occurs in such as Fig. 1
Line voltage between singlephase earth fault, three-phase is remained in that symmetrically, but the voltage-to-ground for perfecting phase can be raised,
In the case of metallicity single-phase earthing, the water of 1.732 times of normal phase voltages can be increased to by perfecting phase-to-ground voltage
Flat, failure phase-to-ground voltage is reduced to 0, and now total system can produce significant residual voltage, therefore can typically select
The criterion for taking residual voltage to occur as earth fault.Because neutral point is non-effective earthing, short circuit current flow
Path can not be formed, when not having arc suppression coil compensation, non-fault line flows through the capacitive earth current of itself,
Faulty line flows through total system non-fault line capacitive earth current sum, can have some differences, but be due to
Physical fault electric current still very little, feature is not obvious enough；, can be to faulty line when being especially in the presence of arc suppression coil
In the zero-sequence current that flows through compensate, now fault current can be smaller, and fault signature is not more obvious.
Domestic and international years of researches are have passed through, there are a variety of earthing wire-selecting methods at present, typically by extracting zero
Power frequency component, harmonic component or transient state component in sequence electric current etc., analysis faulty line and non-fault line it
Between difference, a species diversity is amplitude size, and another species diversity is phase differential, therefore can be classified as than width formula
With than the major class of phase formula two.Most selection methods are all that the earth fault characteristic quantity of each circuit of comprehensive transformer station enters
Row compares, and obtains route selection result, and typically all using special line selection apparatus is configured, access voltage and transformer station are complete
The zero-sequence current of portion's circuit, which is concentrated, to be implemented.In fact, each circuit of transformer station is all configuration protection device, if
Earth fault characteristic quantity is calculated by respective protection device, then information sharing is realized by communication network, then may be used
To realize failure line selection inside protection device, without line-selected earthing device is separately configured again.
The flow of distributed earthing wire-selecting method based on GOOSE refers to Fig. 2, mainly there is following four steps：
Step 1：The protection device of each circuit of transformer station calculates respective earth fault characteristic quantity：
Generally, the protection device of each circuit of transformer station has accessed three-phase voltage, three-phase current, zero
The electrical quantity such as sequence voltage, zero-sequence current, are not required to be individually for earthing wire-selecting increase cable and access other electrical quantity,
When there is no residual voltage, zero-sequence current access, it can also be carried out by three-phase voltage, three-phase current by software
Synthesis.
The calculation procedure of earthing wire-selecting failure amount is configured in the protection device of each circuit of transformer station.When being grounded
During failure, residual voltage rise, protection device starts, into troubleshooting process, needed for calculating earthing wire-selecting
Various fault characteristic values, such as zero sequence fundamental voltage amplitude, zero sequence fundamental phase for power frequency measure feature route selection；
Quintuple harmonics amplitude, quintuple harmonics phase for quintuple harmonics feature route selection；For transient state measure feature route selection
First half crest value, phase, or the modulus maximum obtained through wavelet transformation；For the active of active component route selection
Amplitude, phase of component etc..It is actually needed calculating which kind of or which and plants earth fault characteristic quantity, can basis
Selected earthing method is set.
The protection device of this circuit whole electrical quantity required due to having accessed, therefore calculating of having ready conditions is various required
Earth fault characteristic quantity.
Step 2：The protection device of each circuit of transformer station carries out zero sequence CT monitorings and polarity is corrected automatically：
Because zero-sequence current typically just occurs in earth fault, for the line-selected earthing device being separately configured,
Whether zero sequence CT polarity access is difficult to verify when correct normal, and this can cause the selection method based on phase comparing method
Accuracy rate is greatly lowered.And for protection device, accessed at the same time after three-phase current and zero-sequence current, can be with
It is compared by the zero-sequence current of the self-produced zero-sequence current of three-phase current and outside access, its phase of automatic Verification
It is whether correct.
Protection device by doing vector to three-phase current, obtains self-produced zero-sequence current, by three in a program
Phase voltage does vector, obtains self-produced residual voltage.Because the three-phase current of protection device is relative to three-phase voltage
Polarity all by correctly verifying, therefore self-produced zero-sequence current relative to the polarity of self-produced residual voltage be symbol
Close what is correctly verified.Under normal circumstances, self-produced zero-sequence current should be with the phase and amplitude of external zero-sequence current all
Should be essentially identical.When earth fault occurs, program compares self-produced zero-sequence current and external zero sequence electricity automatically
The phase relative to self-produced residual voltage is flowed, can differentiating zero-sequence current, whether polarity access is wrong, if polarity
It is wrong, then send alarm signal, while to the phase property amount of earth fault with self-produced zero-sequence current relative to from
Corrected automatically on the basis of the phase for producing residual voltage.Pass through this automatic Verification and automatic amendment, Ke Yibao
The earth fault phase property amount polarity for demonstrate,proving each circuit of transformer station is consistent.
Similarly, for the line-selected earthing device being separately configured, zero sequence CT whether break be also can not automatic Verification
's.And in protection device, by the difference in magnitude of relatively self-produced zero-sequence current and external zero-sequence current, when more than
During threshold value, it is determined as that zero sequence CT breaks through delay, alarm signal is sent, so that Field Force has found in time.
Step 3：Earth fault characteristic quantity is converted to GOOSE signals and sent by the protection device of each circuit of transformer station
To communication network：
By step 1 and step 2, each protection device obtains the earth fault characteristic quantity of itself, afterwards by its turn
GOOSE signals are changed to, are sent to communication network.
GOOSE is the standard agreement for meeting IEC61850 standards, according to the regulation of IEC61850 standards, GOOSE
The communication delay of signal should be less than 4ms, therefore GOOSE signals are the characteristics of have high real-time.GOOSE signals
Both Boolean quantity can be transmitted, analog quantity, therefore amplitude Characteristics amount, the phase property of earth fault can be transmitted again
Amount can be transmitted.
In order to realize between the transmission of GOOSE signals, each protection device of transformer station should possess communication network, and
Conventional substation all possesses station level network in itself, can use station level GOOSE, and Intelligent transformer station possessed
Journey layer network, can also use station level GOOSE, no matter conventional substation or Intelligent transformer station, not
Need individually to be further added by the transmission that GOOSE signals can be achieved in communication network.
Step 4：The protection device of each circuit of transformer station receives the earth fault feature of All other routes from communication network
Amount, the earth fault characteristic quantity of Integrated comparative transformer station whole circuit, recognizes faulty line, if faulty line
For circuit where itself, then according to being set for isolated fault of tripping：
Each protection device obtains the earth fault characteristic quantity GOOSE signals of each circuit of transformer station from communication network,
It is hereby achieved that there is the earth fault characteristic quantity of circuit substation, it is comprehensive to carry out amplitude com parison and phase ratio
Compared with realizing failure line selection., then can root if route selection result is itself circuit, and is set as directly tripping operation
Fault Isolation is realized according to setting directly tripping operation.
The present invention also proposes a kind of distributed earthing wire-selecting system based on GOOSE, and its composition refers to Fig. 3, by
The protection device and communication network of each circuit of transformer station are constituted, and each protection device is connected by communication network.Fig. 3
In, P0 is power branch L0 protection device, and L1-L5 is 5 circuits, and P1-P5 is the guarantor of respective lines
Protection unit, Fig. 3 is only for example, and is actually not limited to 5 circuits.Connect in Fig. 3 using neutral point through arc suppression coil
Ground mode, is only a kind of citing, the actual system be applied to neutral point using it is earth-free, through grounding through arc
Or through the non-effective earthing mode such as high resistance ground.The program circuit of the system using proposed in the present invention based on
GOOSE earthing mode transform method.Possess in each protection device calculating ground fault characteristic quantity program,
Integrated comparative characteristic quantity carries out the program of failure line selection.Upon the occurrence of a ground fault, each protection device calculates itself
The earth fault characteristic quantity of circuit, while the zero-sequence current of itself is monitored with the presence or absence of exception, and to phase property
Amount is corrected automatically, and fault characteristic value result is converted into GOOSE signals after being disposed sends to communication network
Network, and from the earth fault characteristic quantity of communication network acquisition transformer station All other routes, Integrated comparative progress afterwards is former
Hinder route selection, can also be according to being set for isolated fault of tripping if line fault where itself.
To sum up, distributed selection method and system of the invention based on GOOSE can be realized as small current neutral grounding system
System is grounded failure line selection, and need not increase equipment, cable connection or communication connection.
The technological thought of above example only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this,
It is every according to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within this
Within invention protection domain.
Claims (4)
1. a kind of distributed earthing wire-selecting method based on GOOSE, it is characterised in that：Have for neutral point is non-
Earthed system is imitated, respective earth fault characteristic quantity is calculated by the protection device of each circuit of transformer station respectively, and turn
It is changed to GOOSE signals to share using communication network, the fault characteristic value identification event of each circuit of Integrated comparative transformer station
Hinder circuit, specifically include following steps：
Step 1：The protection device of each circuit of transformer station calculates respective earth fault characteristic quantity；
Step 2：The protection device of each circuit of transformer station carries out zero sequence CT monitorings and polarity is corrected automatically, leads to
The amplitude and polarity of more self-produced zero-sequence current and external zero-sequence current are crossed, monitoring zero sequence CT breaks, and according to
The polarity of self-produced zero-sequence current is modified to phase earth fault characteristic quantity；
Step 3：Earth fault characteristic quantity is converted to GOOSE signals and sent by the protection device of each circuit of transformer station
To communication network；
Step 4：The protection device of each circuit of transformer station receives the earth fault feature of All other routes from communication network
Amount, the earth fault characteristic quantity of Integrated comparative transformer station whole circuit, recognizes faulty line, if faulty line
For circuit where itself, then according to being set for isolated fault of tripping.
2. a kind of distributed earthing wire-selecting method based on GOOSE as claimed in claim 1, its feature exists
In：Earth fault characteristic quantity is converted into GOOSE signals, carried out by station level network or process-level network
Transmission.
3. a kind of distributed earthing wire-selecting method based on GOOSE according to claim 1, its feature
It is：When earth fault occurs, line protective devices compare self-produced zero-sequence current and external zero-sequence current phase automatically
For the phase of self-produced residual voltage, differentiating zero-sequence current, whether polarity access is wrong, if polarity is wrong,
Alarm signal is sent, while the phase property amount to earth fault is electric relative to self-produced zero sequence with self-produced zero-sequence current
Corrected automatically on the basis of the phase of pressure.
4. a kind of distributed earthing wire-selecting system based on GOOSE, it is characterised in that by each line of transformer station
Line protection device and communication network are constituted, and each line protective devices are connected by communication network, are believed by GOOSE
Number share each circuit earth fault characteristic quantity, for system with non effectively earth ed neutral, by each circuit of transformer station
Protection device calculate respective earth fault characteristic quantity respectively, and be converted to GOOSE signals and utilize communication network
It is shared, the fault characteristic value identification faulty line of each circuit of Integrated comparative transformer station.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108919061A (en) * | 2018-09-20 | 2018-11-30 | 中国南方电网有限责任公司 | A kind of digitlization small current earthing wire-selecting method |
| CN109031175A (en) * | 2018-06-14 | 2018-12-18 | 国网江苏省电力有限公司 | A kind of zero-sequence current method of calibration |
| CN109799427A (en) * | 2019-02-28 | 2019-05-24 | 深圳供电局有限公司 | Fault self-adaptive identification method and electronic equipment |
| CN109980614A (en) * | 2019-03-29 | 2019-07-05 | 广东电网有限责任公司 | A kind of distribution line zero-sequenceprotection direction-adaptive method of discrimination |
| CN110780160A (en) * | 2019-12-06 | 2020-02-11 | 广东电网有限责任公司 | Arc light high-resistance grounding fault detection method and device |
| CN110927631A (en) * | 2019-12-03 | 2020-03-27 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
| CN112505585A (en) * | 2020-11-27 | 2021-03-16 | 广东电网有限责任公司佛山供电局 | Low-current ground fault line selection method for double circuit lines on same tower |
| CN113552441A (en) * | 2020-04-24 | 2021-10-26 | 南京南瑞继保电气有限公司 | Single-phase earth fault detection method and device |
| CN116243208A (en) * | 2023-02-03 | 2023-06-09 | 珠海欧力配网自动化股份有限公司 | Distributed small-current line selection method based on goose communication |
| CN118367511A (en) * | 2024-06-20 | 2024-07-19 | 东方电子股份有限公司 | Grounding line selection method based on data interaction between protection devices |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110978A (en) * | 2011-01-20 | 2011-06-29 | 单立辉 | Method and device for high-accuracy low-current intelligent grounding wire selection |
| CN202649381U (en) * | 2012-07-06 | 2013-01-02 | 许继电气股份有限公司 | GOOSE-based small-current grounding route selection system of intelligent transformer substation |
| CN103412239A (en) * | 2013-07-03 | 2013-11-27 | 南京南瑞继保电气有限公司 | Detecting and positioning method of bus coupler flashover fault in subway alternating current power system |
-
2016
- 2016-04-26 CN CN201610266157.8A patent/CN107315128A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110978A (en) * | 2011-01-20 | 2011-06-29 | 单立辉 | Method and device for high-accuracy low-current intelligent grounding wire selection |
| CN202649381U (en) * | 2012-07-06 | 2013-01-02 | 许继电气股份有限公司 | GOOSE-based small-current grounding route selection system of intelligent transformer substation |
| CN103412239A (en) * | 2013-07-03 | 2013-11-27 | 南京南瑞继保电气有限公司 | Detecting and positioning method of bus coupler flashover fault in subway alternating current power system |
Non-Patent Citations (1)
| Title |
|---|
| 刘益青: "智能变电站站域后备保护原理及实现技术研究", 《山东大学博士学位论文》 * |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031175A (en) * | 2018-06-14 | 2018-12-18 | 国网江苏省电力有限公司 | A kind of zero-sequence current method of calibration |
| CN108919061A (en) * | 2018-09-20 | 2018-11-30 | 中国南方电网有限责任公司 | A kind of digitlization small current earthing wire-selecting method |
| CN109799427A (en) * | 2019-02-28 | 2019-05-24 | 深圳供电局有限公司 | Fault self-adaptive identification method and electronic equipment |
| CN109980614A (en) * | 2019-03-29 | 2019-07-05 | 广东电网有限责任公司 | A kind of distribution line zero-sequenceprotection direction-adaptive method of discrimination |
| CN109980614B (en) * | 2019-03-29 | 2020-12-29 | 广东电网有限责任公司 | Self-adaptive discrimination method for zero sequence protection direction of distribution line |
| CN110927631B (en) * | 2019-12-03 | 2022-01-11 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
| CN110927631A (en) * | 2019-12-03 | 2020-03-27 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
| CN110780160B (en) * | 2019-12-06 | 2021-10-19 | 广东电网有限责任公司 | Arc light high-resistance grounding fault detection method and device |
| CN110780160A (en) * | 2019-12-06 | 2020-02-11 | 广东电网有限责任公司 | Arc light high-resistance grounding fault detection method and device |
| CN113552441A (en) * | 2020-04-24 | 2021-10-26 | 南京南瑞继保电气有限公司 | Single-phase earth fault detection method and device |
| CN113552441B (en) * | 2020-04-24 | 2024-04-30 | 南京南瑞继保电气有限公司 | Single-phase earth fault detection method and device |
| CN112505585A (en) * | 2020-11-27 | 2021-03-16 | 广东电网有限责任公司佛山供电局 | Low-current ground fault line selection method for double circuit lines on same tower |
| CN112505585B (en) * | 2020-11-27 | 2022-05-10 | 广东电网有限责任公司佛山供电局 | Same-tower double-circuit line small-current ground fault line selection method |
| CN116243208A (en) * | 2023-02-03 | 2023-06-09 | 珠海欧力配网自动化股份有限公司 | Distributed small-current line selection method based on goose communication |
| CN118367511A (en) * | 2024-06-20 | 2024-07-19 | 东方电子股份有限公司 | Grounding line selection method based on data interaction between protection devices |
| CN118367511B (en) * | 2024-06-20 | 2024-08-27 | 东方电子股份有限公司 | Grounding line selection method based on data interaction between protection devices |
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