CN206947949U - A kind of active filter with lightning protection isolation with arc-detection function - Google Patents
A kind of active filter with lightning protection isolation with arc-detection function Download PDFInfo
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- CN206947949U CN206947949U CN201720637877.0U CN201720637877U CN206947949U CN 206947949 U CN206947949 U CN 206947949U CN 201720637877 U CN201720637877 U CN 201720637877U CN 206947949 U CN206947949 U CN 206947949U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The utility model provides a kind of active filter with lightning protection isolation with arc-detection function, it is a kind of to have ground potential counterattack isolation, fault electric arc detection, the safety utilization of electric power device of current harmonics elimination and three phase unbalance current compensation function, including voltage sensor, current sensor, sample circuit, signal processing circuit, main control MCU, arc fault warning circuit, switching value spacing output circuit, IGBT drive circuit, current harmonics elimination and main compensation circuit and ground potential counterattack isolation module concurrently.The current detecting of fault electric arc is shared with current harmonics elimination with the current detecting part compensated, using same detection signal, carry out fault electric arc analysis and compensating instruction Current calculation simultaneously using common main control unit, enable devices to be sampled out before fault electric arc characteristic current is filtered, ensure the accurate detection of fault electric arc.
Description
Technical field
Power Quality Detection administrative skill field is the utility model is related to, it is more particularly to a kind of that there is lightning protection isolation and electric arc
The active filter of detection function.
Background technology
In recent years, because fire phenomena frequency caused by electric reason has generation, a large amount of personnel's injuries and material damage are caused.
The reason for causing electrical fire mainly has two：(1) electric current.Including electricity caused by the reasons such as short circuit, overload, harmonic wave and imbalance
Gas fire；(2) fault electric arc.The electricity as caused by the reasons such as electric component loose contact, earth fault produce electric arc or electric spark
Gas fire.Wherein, arc phenomenon usually occurs in supply line, and fault electric arc temperature is higher, seriously endangers fire-fighting peace
Entirely, it is to cause one of major reason of electrical fire, therefore the research of fault electric arc detection is particularly important.
And with the development of power system, it is wide to grid stability requirement more and more higher, a large amount of utility power quality control devices
It is general to be arranged among power network.The installing of these utility power quality control devices also produces extreme influence, such as active electrical to arc-detection
Force filter (APF) although application harmonic wave and out-of-balance current are significantly improved, when fault electric arc occurs,
High frequency harmonic components in electric current, which are possible to be filtered out by APF, causes original fault electric arc detection equipment can not normally detect failure
Electric arc.
At the same time, as China is industrial constantly progressive, automatic control level also more and more higher is more and more
Distributed Control System and intelligence instrument extensive use, in order to prevent these automated productions by lightning hazards, power system
Take a large amount of lightning protection earthing measures, generally between lightning proof ground and protecting field install ground potential counterattack isolation, with it is anti-lightning strike when, by
Protecting field connection equipment is caused damage in ground potential counterattack.Ground potential counterattack isolation generally presents low in no surge current
Impedance, occur that high impedance is presented during surge current, buffer action is played to lightning current.But ground potential counterattack xegregating unit also has
Buffer action may be produced to high frequency electric caused by fault electric arc, influence the normal work of fault electric arc detection equipment.
Therefore, local potential counterattack xegregating unit, fault electric arc detection equipment, utility power quality control equipment independent operating
When, it is possible to have a negative impact mutually, cause incalculable damage.
The content of the invention
In order to solve problem described in background technology, the utility model, which provides one kind, has lightning protection isolation and arc-detection work(
The active filter of energy, the current detecting of fault electric arc and current harmonics elimination and the current detecting part of compensation are total to
Enjoy, using same detection signal, carry out fault electric arc analysis and compensating instruction galvanometer simultaneously using common main control unit
Calculate, enable devices to be sampled out before fault electric arc characteristic current is filtered, ensure the accurate detection of fault electric arc.
In order to achieve the above object, the utility model is realized using following technical scheme：
A kind of active filter with lightning protection isolation and arc-detection function, be one kind have concurrently ground potential counterattack isolation,
The safety utilization of electric power device of fault electric arc detection, current harmonics elimination and three phase unbalance current compensation function, including voltage sensor
Device, current sensor, sample circuit, signal processing circuit, main control MCU, arc fault warning circuit, switching value isolation and amplifier electricity
Road, IGBT drive circuit, current harmonics elimination and main compensation circuit and ground potential counterattack isolation module.
Described main control MCU connects voltage sensor and current sensor by signal processing circuit with sample circuit, main
Control MCU is also connected with arc fault warning circuit and IGBT drive circuit, while also connects harmonic current by IGBT drive circuit
Suppress and main compensation circuit, main control MCU by IGBT drive circuit export IGBT trigger pulse, control current harmonics elimination with
Main compensation circuit real-Time Compensation load harmonic and out-of-balance current.
Main control MCU by same voltage and current sample signal respectively by fault electric arc analysis and instruction current calculate after,
Fault electric arc warning output and the output of IGBT triggering commands are carried out respectively；Enable devices to be filtered in fault electric arc characteristic current
Before be sampled out, ensure the accurate detection of fault electric arc.
The ground potential counterattack isolation module is made up of a lightning current frequency impedance device, is installed in series in lightning proof ground with protecting
Shield forms thunder and lightning insulation blocking between ground, and Low ESR is presented under normal circumstances, ensures the normal safety ground of equipment；Work as thunder and lightning
Stream from lightning protection ground terminal strike back when, under lightning current frequency, the element shows high impedance, isolates the counterattack of thunder and lightning, forces thunder and lightning
Stream can only be released to earth mat so that protection ground terminal exempt from back flashover harm, after the completion of lightning current is released, the lightning protection every
Low impedance state is returned to again from element.
Described main control MCU also controls power supply while fault electric arc alarm is exported by switching value spacing output circuit
The disconnection of breaker, cut off the electricity supply during failure.
Described current harmonics elimination and main compensation circuit be electronic power convertor, including multigroup IGBT units, are formed
Two level or three-level three-phase voltage source converter topology, can also form split-phase H bridge structural topologies.
Compared with prior art, the beneficial effects of the utility model are：
1st, a kind of active filter with lightning protection isolation with arc-detection function of the present utility model, by fault electric arc
Current detecting is shared with current harmonics elimination with the current detecting part compensated, using same detection signal, enables device
It is enough to be sampled out before fault electric arc characteristic current is filtered, ensure the accurate detection of fault electric arc.
2nd, a kind of active filter with lightning protection isolation with arc-detection function of the present utility model, utilizes same master control
MCU is handled same current data, calculates fault electric arc characteristic value and compensating instruction current value respectively, respectively to failure electricity
Arc warning circuit and the IGBT drive circuit of filtering are controlled, and are perfectly realized and are realized the same of two kinds of functions with individual equipment
When take into account use, effectively solve the problems, such as to cause fault electric arc to be failed to judge, judged by accident due to the use of Active Power Filter-APF.
3rd, a kind of active filter with lightning protection isolation with arc-detection function of the present utility model, ground potential is struck back
Xegregating unit be integrated into isolation fire prevention warning function active filter in, make integral device i.e. have ground potential strike back every
From function, and the detection of fault electric arc is not influenceed, than each, progress fault electric arc Detection results are good during independently installed situation.
Brief description of the drawings
Fig. 1 is a kind of structural representation with lightning protection isolation with the active filter of arc-detection function of the present utility model
Figure；
Fig. 2 is a kind of main control MCU with lightning protection isolation with the active filter of arc-detection function of the present utility model
Illustrative view of functional configuration；
Fig. 3 is a kind of main control MCU with lightning protection isolation with the active filter of arc-detection function of the present utility model
Control structure schematic diagram；
Fig. 4 is of the present utility model a kind of anti-with lightning protection isolation and the ground potential of the active filter of arc-detection function
Hit isolation module structural representation；
Fig. 5 is of the present utility model a kind of with lightning protection isolation and the embodiment of the active filter of arc-detection function
Two level harmonic electric currents suppress and main compensation circuit structure chart；
Fig. 6 is of the present utility model a kind of with lightning protection isolation and the embodiment of the active filter of arc-detection function
Three level harmonic electric currents suppress and main compensation circuit structure chart；
Fig. 7 is of the present utility model a kind of with lightning protection isolation and the embodiment of the active filter of arc-detection function
Split-phase H bridge structure current harmonics eliminations and main compensation circuit structure chart；
Fig. 8 is of the present utility model a kind of with lightning protection isolation and the embodiment of the active filter of arc-detection function
Compensating instruction current calculation method；
Fig. 9 is of the present utility model a kind of with lightning protection isolation and the failure electricity in the active filter of arc-detection function
Arc detection method flow chart.
Embodiment
Embodiment provided by the utility model is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, 2, a kind of active filter with lightning protection isolation with arc-detection function, it is that one kind has ground electricity concurrently
Strike back the safety utilization of electric power device of isolation, fault electric arc detection, current harmonics elimination and three phase unbalance current compensation function, bag in position
Include voltage sensor, current sensor, sample circuit, signal processing circuit, main control MCU, arc fault warning circuit, switching value
Spacing output circuit, IGBT drive circuit, current harmonics elimination and main compensation circuit and ground potential counterattack isolation module.
Described main control MCU connects voltage sensor and current sensor by signal processing circuit with sample circuit, main
Control MCU is also connected with arc fault warning circuit and IGBT drive circuit, while also connects harmonic current by IGBT drive circuit
Suppress and main compensation circuit, main control MCU export IGBT trigger pulse, current harmonics elimination and compensation by IGBT drive circuit
Main circuit real-Time Compensation load harmonic and out-of-balance current.
As shown in figure 3, electricity is analyzed and instructed respectively to same voltage and current sample signal by main control MCU by fault electric arc
After stream calculation, fault electric arc warning output and the output of IGBT triggering commands are carried out respectively；Enable devices in fault electric arc feature
Electric current is sampled out before being filtered, and ensures the accurate detection of fault electric arc.
As shown in figure 4, the ground potential counterattack isolation module is made up of a lightning current frequency impedance device, it is installed in series
Thunder and lightning insulation blocking is formed between lightning proof ground and protecting field, Low ESR is presented under normal circumstances, ensures the normal safety of equipment
Ground connection；When lightning current is struck back from lightning protection ground terminal, under lightning current frequency, the element shows high impedance, isolates the anti-of thunder and lightning
Hit, force lightning current to be released to earth mat so that protection ground terminal exempts from back flashover harm, when lightning current is released completion
Afterwards, the lightning protection isolation element returns to low impedance state again.
Described lightning current frequency impedance device is a kind of reactor, and its core material can be FERRITE CORE such as MnZn system
Material, Ni-Zn series material, magnesium zinc system material etc. or alloy type magnetic core such as silicon (silicon) steel, ferrocart core, sendust, iron nickel
Alloy, molybdenum permalloy, amorphous, microcrystallizing alloy etc..Wire rod can be polyurethanes enamel-covered wire, polyester enamelled wire from adhesive aggregation
Carbamate enamel-covered wire, silk-covered wire, twisted wire, plating copper cash, three layer insulation wire, PVC lines etc..Its equivalent model is represented by managing
Think inductance series equivalent resistance parallel parasitic capacitance again, high resistant now is presented for the frequency range of lightning current energy-intensive to external characteristic table
Anti-, other frequency ranges show as Low ESR.Conducting state is shown as under normal circumstances, and impedance is low, ensures the normal peace of equipment
Full ground connection；When earthed system have lightning current by when, under lightning current frequency, the element is high impedance, blocks the counterattack of thunder and lightning,
So that lightning current can only be released to earth mat.After the completion of lightning current is released, ground potential counterattack isolation element returns to again
Low impedance state.
Described main control MCU also controls power supply while fault electric arc alarm is exported by switching value spacing output circuit
The disconnection of breaker, cut off the electricity supply during failure.
Described current harmonics elimination and main compensation circuit be electronic power convertor, including multigroup IGBT units, are formed
Two level or three-level three-phase voltage source converter topology, can also form split-phase H bridge structural topologies.
As shown in figure 5, to use two level three-phase voltage source type transverters topology in embodiment.Six groups are included in topology
IGBT units.
As shown in fig. 6, to use three-level three-phase voltage source converter topology in embodiment.12 groups are included in topology
IGBT units.
As shown in fig. 7, to use split-phase H bridge structure three-phase voltage source types transverter topology in embodiment.Included in topology
Three groups of IGBT units.
Described main control MCU is single chip machine controlling circuit, is made up of singlechip chip and its peripheral circuit.
Described IGBT drive circuit is the IGBT drive circuit of prior art.
Described arc fault warning circuit includes buzzer and its drive circuit.
Described switching value spacing output circuit is made up of optocoupler.
A kind of control method with lightning protection isolation with the active filter of arc-detection function, it is characterised in that including
Following steps：
Step 1: system initialization, electricity on device；
Step 2: acquisition system three-phase voltage and three-phase current, and signal is delivered into signal modulation process circuit；
Step 3: signal modulation process circuit is modulated processing to voltage and current signal respectively, and will be modulated after
Signal deliver to main control MCU unit；
Step 4: main control MCU unit calculates the command current value for needing to compensate by sample rate current, voltage parameter；Meanwhile
To current signal processing, arc current characteristic value is extracted；
Step 5: instruction current of the main control MCU unit according to the compensation of calculating, passes through instruction current tracking module, generation
Trigger pulse, control IGBT, real-Time Compensation load harmonic and out-of-balance current；
Meanwhile main control MCU unit carries out analysis judgement, such as according to by logical calculated to extraction arc current characteristic value
Meet fault electric arc signal, then send instruction to fault electric arc warning module, and cut off the electricity supply breaker by output signal, cut
Disconnected fault electric arc；As do not met, instruction, and return to step two are not sent.
As shown in Figure 8, it is preferable that the instruction current computational methods of compensation, use be based on instantaneous reactive in the present embodiment
The i of Power Theoryp-iqMethod detection compensates electric current to illustrate, and the protection domain of this patent includes but is not limited to this detection side
Method.Comprise the following steps：
1st, load current ia, ib, ic are detected；
2nd, ABC three-phase currents are changed into by electric current ip, iq under rest frame by rotation transformation；
3rd, by low pass filter LPF, the fundamental positive sequence of load current is obtained
4th, by rotating electric current iaf, ibf, icf for changing under ABC coordinate systems；
5th, to be supported electric current and subtract can obtain load harmonic current and out-of-balance current iah, ibh, ich, i.e. compensation device
Instruction current；
6th, by instruction current tracking module, tactile pulse is generated, controls IGBT, real-Time Compensation load harmonic and imbalance
Electric current.
As shown in figure 9, a kind of detect with lightning protection isolation and the fault electric arc in the active filter of arc-detection function
Method, judged jointly using four kinds of conditions, and one of which decision condition by the use of current difference parameter result of determination as
Premise, fault electric arc is judged using relative harmonic content rate of change, effective detection can be out of order electricity in complex situations
Arc, comprise the following steps：
Step 1：Persistently electric current is sampled (according to actual hardware situation, each cycle adopts 64 or 128 points)；
Step 2：The sampled value of electric current is 128 each cycles or 64 each cycles.Exemplified by 64 points, current sampling data is remembered
For I0、I1、……、I63, normal cycle electric current is designated as In0、In1、……、In63(sampled value and normal value be perunit value).Calculate
The difference parameter of current sampling period electric current and normal cycle electric current：
By IperWith threshold value S1Compare, if Iper≤S1, then sampled current value width is given to normal cycle current value, renewal is normally
Periodic current value；If Iper＞ S1, then calculating is further analyzed to judge whether to be occurred by fault electric arc；
Step 3：The average value of calculating current：
Judge whether the positive-negative half-cycle of electric current is symmetrical with the average value of electric current.If IaveMore than given threshold value S2, then it is assumed that
Waveform symmetry is unsatisfactory for requiring, indicates parameter m1 assignment 1 for waveform symmetry, be otherwise m1 assignment 0；
Step 4：Calculate the difference of the two neighboring sampled value of sample rate current：
ΔIk=Ik+1-Ik(k=0,1,2 ... 62) (3)
With the maximum K of the differencev=max [Δ I0, Δ I1..., Δ I62] represent the maximum rate of change of electric current.If Kv
More than threshold value S3, then it is assumed that current changing rate is excessive, is current changing rate parameter m2 assignment 1, and otherwise m2 is entered as zero；
Step 5：The wave mode parameter of calculating current：
Wherein, α is configured according to actual current, typically takes normal current peak value.Can be with table with the wave mode parameter of electric current
Show whether electric current contains flat shoulder.If KpMore than threshold value S4, then it is assumed that electric current contains flat shoulder, and parameter m3 is indicated for flat shoulder
Assignment 1, otherwise m3 be entered as zero；
Step 6：Sample rate current harmonic wave is detected with FFT, sample rate current higher hamonic wave is calculated and (calculates the 3rd, 5,7,9 time herein
Harmonic wave) containing ratio rate of change Δ PnIf Δ PnMore than threshold value S4, then it is assumed that sample rate current harmonic content is abnormal, is indicated for harmonic wave
Parameter m4 is entered as 1, is otherwise entered as 0；
Step 7：Calculate the sum of four instruction parameters in 3~step 6 of above-mentioned steps, i.e. m=m1+m2+m3+m4；If m>=
2, fault electric arc cycle instruction parameter sum=sum+1, if sum>=6, then trigger alarm signal；If sum<6, then return to step
Rapid 2 continue to differentiate；If m<2, then it is assumed that there is no fault electric arc, be sum assignment 0, and normal current is updated to now
Sample rate current.
Step 6 comprises the following steps that：
Step 601. calculates sampling period odd harmonic containing ratio rate of change Δ PnWith given threshold Δ PthCompare；Harmonic wave
Containing ratio is defined asWherein I1For fundamental current, IhFor the root-mean-square value of h subharmonic currents,Xh1For h subharmonic current sampled values, M is sampling number, taken in this example 3,5,7,9 times it is humorous
Ripple, calculating odd harmonic containing ratio is
Step 602. is based on the 1st normal power frequency sampling period electric current odd harmonic containing ratio P that step 2 is judged
Value, calculates two neighboring power frequency sampling period electric current odd harmonic containing ratio rate of change Δ Pn, Δ Pn=Pn- P, double sampling week
The difference of electric current odd harmonic containing ratio is sampling period odd harmonic containing ratio rate of change Δ P between phasen。
A kind of active filter with lightning protection isolation with arc-detection function of the present utility model, by the electricity of fault electric arc
Stream detection is shared with current harmonics elimination with the current detecting part compensated, using same detection signal, enables devices to
It is sampled out before fault electric arc characteristic current is filtered, ensures the accurate detection of fault electric arc.
A kind of active filter and its control method with lightning protection isolation with arc-detection function of the present utility model, profit
Same current data is handled with same main control MCU, calculates fault electric arc characteristic value and compensating instruction current value respectively, point
The other IGBT drive circuit to fault electric arc warning circuit and filtering is controlled, and is perfectly realized and is realized two with individual equipment
Use is taken into account while kind function, effectively solves to cause fault electric arc to be failed to judge due to the use of Active Power Filter-APF, miss
The problem of sentencing.
A kind of fault electric arc detection with lightning protection isolation with the active filter of arc-detection function of the present utility model
Method, by the use of the result of determination of current difference parameter as premise, fault electric arc is sentenced using relative harmonic content rate of change
It is disconnected, the interference of nonlinear load can be effectively excluded, while judged using four kinds of judging means, it is accurate to detect the electricity that is out of order
Arc.
A kind of active filter with lightning protection isolation and arc-detection function of the present utility model, by ground potential counterattack every
From integration of equipments into the active filter with isolation fire prevention warning function, make integral device that there is ground potential counterattack isolation
Function, and the detection of fault electric arc is not influenceed, than each, progress fault electric arc Detection results are good during independently installed situation.
Above example is implemented under premised on technical solutions of the utility model, gives detailed embodiment
With specific operating process, but the scope of protection of the utility model is not limited to the above embodiments.Side used in above-described embodiment
Method is conventional method unless otherwise instructed.
Claims (3)
1. a kind of active filter with lightning protection isolation with arc-detection function, it is that one kind has ground potential counterattack isolation, event concurrently
The safety utilization of electric power device of barrier arc-detection, current harmonics elimination and three phase unbalance current compensation function, including voltage sensor,
Current sensor, sample circuit, signal processing circuit, main control MCU, arc fault warning circuit, switching value spacing output circuit,
IGBT drive circuit, current harmonics elimination and main compensation circuit and ground potential counterattack isolation module；
Characterized in that, described main control MCU connects voltage sensor with sample circuit by signal processing circuit and electric current passes
Sensor, main control MCU are also connected with arc fault warning circuit and IGBT drive circuit, while are also connected by IGBT drive circuit humorous
Ripple electric current suppresses and main compensation circuit, and main control MCU exports IGBT trigger pulse by IGBT drive circuit, controls harmonic current
Suppress and main compensation circuit real-Time Compensation load harmonic and out-of-balance current；
Main control MCU respectively by fault electric arc analysis with after instruction current calculating, distinguishes same voltage and current sample signal
Carry out fault electric arc warning output and the output of IGBT triggering commands；Enable devices to the quilt before fault electric arc characteristic current is filtered
Sampling comes out, and ensures the accurate detection of fault electric arc；
The ground potential counterattack isolation module is made up of a lightning current frequency impedance device, is installed in series in lightning proof ground and protecting field
Between formed thunder and lightning insulation blocking.
2. a kind of active filter with lightning protection isolation with arc-detection function according to claim 1, its feature exist
In, the output fault electric arc alarm of described main control MCU, while power circuit breaker is also controlled by switching value spacing output circuit
Disconnect, cut off the electricity supply during failure.
3. a kind of active filter with lightning protection isolation with arc-detection function according to claim 1, its feature exist
In, described current harmonics elimination and main compensation circuit be electronic power convertor, including multigroup IGBT units, two level of composition
Or three-level three-phase voltage source converter topology, or composition split-phase H bridge structural topologies.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720637877.0U CN206947949U (en) | 2017-06-02 | 2017-06-02 | A kind of active filter with lightning protection isolation with arc-detection function |
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| CN201720637877.0U CN206947949U (en) | 2017-06-02 | 2017-06-02 | A kind of active filter with lightning protection isolation with arc-detection function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525526A (en) * | 2020-04-30 | 2020-08-11 | 广东电网有限责任公司清远供电局 | Ground net isolating device |
| US11859878B2 (en) | 2018-10-23 | 2024-01-02 | Carrier Corporation | Electrocaloric heat transfer system |
-
2017
- 2017-06-02 CN CN201720637877.0U patent/CN206947949U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11859878B2 (en) | 2018-10-23 | 2024-01-02 | Carrier Corporation | Electrocaloric heat transfer system |
| CN111525526A (en) * | 2020-04-30 | 2020-08-11 | 广东电网有限责任公司清远供电局 | Ground net isolating device |
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