CN106405402A - Breaker fracture dynamic voltage distribution measurement wiring loop and measurement method - Google Patents
Breaker fracture dynamic voltage distribution measurement wiring loop and measurement method Download PDFInfo
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- CN106405402A CN106405402A CN201610878398.8A CN201610878398A CN106405402A CN 106405402 A CN106405402 A CN 106405402A CN 201610878398 A CN201610878398 A CN 201610878398A CN 106405402 A CN106405402 A CN 106405402A
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- breaker
- voltage
- chopper
- potentiometer
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/333—Testing of the switching capacity of high-voltage circuit-breakers ; Testing of breaking capacity or related variables, e.g. post arc current or transient recovery voltage
- G01R31/3333—Apparatus, systems or circuits therefor
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The present invention discloses a breaker fracture dynamic voltage distribution measurement wiring loop and measurement method. A power system consisting of a short circuit generator, a transformer and auxiliary devices thereof and a high-voltage capacitive load are employed to apply power frequency alternating voltage and direct current voltage at the same time at the two ends of the fracture in the process that the breaker cuts a filter, and a plurality of general high-voltage bleeders are accessed to measure and record the voltage waveforms of the relevant feature points of the breaker so as to reach the purpose of measuring the voltage alternating and direct current distribution conditions of the breaker among fractures in the work condition of the alternating and direct current superposition; and moreover, the parallel high-voltage resistance equivalent pollution grade method is employed to measure the voltage alternating and direct current distribution condition of the breaker fracture in the pollution state.
Description
Technical field
The present invention relates to DC transmission system O＆M technical field is and in particular to a kind of breaker fracture alternating current-direct current dynamic electric
Pressure distribution situation measurement connection circuit and measuring method.
Background technology
Alternating current filter as one of the visual plant of current conversion station, can reduce produce in alternating current-direct current conversion process humorous
Ripple is it is ensured that the quality of power supply is up to standard.And AC filter and breaker (hereinafter referred to as ACF chopper) is due to its special applied field
Close, capacitive load need to be cut off, switching is frequent, and interrupting process is subjected to alternating current-direct current mixed-voltage, and operating mode is more severe, compares general
Logical chopper should have higher technical requirements.
When chopper cuts alternating current filter capacitive load, breaker fracture ac bus side is AC sine wave, load-side
For a DC voltage, the lower waveform that can form 1-cos θ of alternating current-direct current superposition, in a power frequency half-wave, (China is 10ms) reaches
Peak value.Under the conditions of different filths, its combined-voltage distribution situation and transient process and voltage change process all not phases
With.At present, international standard, domestic standard and industry standard to chopper insulation examination only consider clean state under or
Connecting-disconnecting function under person's low filth level and insulating properties, not to disconnected under extreme environmental conditions or under the conditions of heavy pollution
Road device fracture voltage distribution is estimated, so also without corresponding test method and test connection loop.The table of chopper
Face filth state is serious rear to a certain extent it would be possible to more uniform voltage's distribiuting brings subversive shadow originally to its fracture
Ring, thus affecting the overall break performance of chopper and insulating properties.
Content of the invention
For correct measurement alternating current-direct current dynamic electric voltage distribution situation between breaker fracture, an object of the present invention is
A kind of breaker fracture dynamic electric voltage distribution measuring connection circuit is provided, fracture voltage distribution situation is studied, explore
The determination of the engineering parameter of alternating current filter chopper under complex environment operating mode.
For achieving the above object, the technical scheme that the present invention takes is as follows,
A kind of breaker fracture dynamic electric voltage distribution measuring connection circuit, includes：
Large Copacity short-circuit generator G, in order to simulate electric power system power source, offer Large Copacity power supply in short-term；
Booster transformer T, its primary side connect Large Copacity short-circuit generator G, primary side be sequentially connected in series breaker protector AB,
Alternating current filter chopper T0 and capacitive load C；
Large Copacity short-circuit generator G is also in series with closing switch HK and protective breaker CD；
Described protective breaker AB two ends filth in parallel equiva lent impedance Z1, alternating current filter is in parallel dirty with chopper T0 two ends
Dirty equiva lent impedance Z2；
In public one end being terminated with potentiometer V2 of filthy equiva lent impedance Z1 and filthy equiva lent impedance Z2, filthy equivalent
Another one end being terminated with potentiometer V1 of impedance Z 1, in another one end being terminated with potentiometer V3 of filthy equiva lent impedance Z2,
Described potentiometer V1, potentiometer V2, potentiometer V3 each other end ground connection, described potentiometer V2 is parallel with filthy equiva lent impedance
Z3.
Further, described alternating current filter chopper T0 is 550kV and above porcelain knob breaker, this porcelain
Column type circuit breaker includes at least two fractures.
Further, described capacitive load C includes Capacitor stack and load resistance.
Further, described potentiometer V1, potentiometer V2 and potentiometer V3 adopt capacitance-resistance series-parallel connection partial pressure mode.
Another object of the present invention is to providing a kind of fracture alternating current-direct current dynamic electric voltage distribution situation experiment with measuring method, right
Voltage's distribiuting measures and revises, and finally draws distribution results.
For achieving the above object, the present invention adopts the technical scheme that：
A kind of fracture alternating current-direct current dynamic electric voltage distribution situation experiment with measuring method, using above-mentioned fracture alternating current-direct current dynamic electric voltage
Distribution situation measures connection circuit, comprises the following steps：
To chopper T0, the D.C. resistance under varying environment operating mode measures step 1.；
Step 2. chopper T0 keeps separating brake, and protective breaker AB before test, CD all keep closing a floodgate, firing test, great Rong
After amount short-circuit generator G boosts to predetermined value, closing switch HK closes a floodgate, and records exchange respectively on 3 potentiometer V1, V2, V3
Voltage, after keeping voltage waveform at least 100ms, protective breaker T0 separating brake, the test voltage waveform during record, by reading
The virtual value of the alternating voltage that 3 potentiometer V1, V2, V3 record, the AC compounent of at least two fracture voltages when obtaining test
Distribution relation；
Step 3. chopper T0, protective breaker AB, keep closing a floodgate before CD test, firing test, and Large Copacity short circuit generates electricity
After machine G boosts to predetermined value, closing switch HK closes a floodgate, and connects low-pressure side and high-pressure side test loop.Subsequently chopper T0 separating brake,
Cut-off capacity current, the mains side at chopper T0 two ends and load-side produce alternating voltage and DC voltage respectively, by 3
Potentiometer V1、V2、V3On record voltage waveform, after keeping cut-offfing rear voltage waveform at least 300ms, protective breaker AB, CD divide
Lock, off-test；
Step 4. adopts different filthy equivalent resistance Z1, Z2, Z3, repeats above step 1 to 3, records different filths etc.
Fracture combined-voltage distribution situation under effect environmental condition.
Further, the Measuring DC Resistance of described step 1 is：Apply DC voltage in one end of chopper, another
Terminate and carry out reading into ammeter, D.C. resistance is obtained according to DC voltage and electric current.
Further, described step 4 changes filthy equiva lent impedance Z1, Z2, Z3 using the method by manually defiling.
Compared with prior art, the present invention utilizes the electricity of short-circuit generator, transformator and its auxiliary equipment composition to the present invention
Origin system and high voltage capacitive load, apply power frequency ac voltage at fracture two ends during chopper cuts wave filter simultaneously
And DC voltage, and access several general high-voltage bleeders to measure and to record the voltage waveform of chopper correlated characteristic point,
Reach the purpose of measurement chopper alternating current-direct current dynamic electric voltage distribution situation between multi-break under alternating current-direct current superimposition condition.Pass through simultaneously
Using the method for parallel high voltage equivalent resistance gradation for surface pollution, breaker fracture alternating current-direct current dynamic electric voltage under filthy state for the measurement
Distribution situation.
Brief description
Fig. 1 is that the chopper of the present invention cuts the schematic diagram in wave filter test connection loop；
Fig. 2 is a kind of schematic flow sheet of breaker fracture dynamic electric voltage distribution measurement method of the present invention；
Fig. 3 is the alternating voltage distribution situation test oscillogram of two fractures；
Fig. 4 a is the test waveform figure of filthy condition breaker fracture alternating current-direct current dynamic electric voltage distribution situation once；
Fig. 4 b is the test waveform figure of the breaker fracture alternating current-direct current dynamic electric voltage distribution situation under filthy condition two.
Specific embodiment
With reference to the accompanying drawings and detailed description present disclosure is described in further details.
Refer to shown in Fig. 1, a kind of breaker fracture dynamic electric voltage distribution measuring connection circuit of the embodiment of the present invention, bag
Include：
Large Copacity short-circuit generator G, in order to simulate electric power system power source, offer Large Copacity power supply in short-term；
Booster transformer T, its primary side connect Large Copacity short-circuit generator G, primary side be sequentially connected in series breaker protector AB,
Alternating current filter chopper T0 and capacitive load C；Described booster transformer T can improve the output voltage of pilot system, makes
The voltage levvl of pilot system can reach each voltage levvl that research needs, such as the rated voltage level of chopper；
Large Copacity short-circuit generator G is also in series with closing switch HK and protective breaker CD；
Described protective breaker AB two ends filth in parallel equiva lent impedance Z1, alternating current filter is in parallel dirty with chopper T0 two ends
Dirty equiva lent impedance Z2；
In public one end being terminated with potentiometer V2 of filthy equiva lent impedance Z1 and filthy equiva lent impedance Z2, filthy equivalent
Another one end being terminated with potentiometer V1 of impedance Z 1, in another one end being terminated with potentiometer V3 of filthy equiva lent impedance Z2,
Described potentiometer V1, potentiometer V2, potentiometer V3 each other end ground connection, described potentiometer V2 is parallel with filthy equiva lent impedance
Z3.
As specific embodiment, described alternating current filter chopper T0 is 550kV and above porcelain knob breaks
Road device, this porcelain knob breaker includes at least two fractures.
As specific embodiment, described capacitive load C includes Capacitor stack and load resistance, in the effect of alternating current power supply
Lower capacitive load C produces capacity current, and provides DC voltage to be applied to the load-side of chopper after chopper cut-offs.
Further, described potentiometer V1, potentiometer V2 and potentiometer V3 adopt capacitance-resistance series-parallel connection partial pressure mode, and its specification is：
Rated voltage 750kV, rated capacitance 400pF.
Described protective breaker CD is low-pressure side protective breaker, and protective breaker AB is high-pressure side protective breaker.
It is a kind of breaker fracture dynamic electric voltage distribution measurement method of the embodiment of the present invention referring to Fig. 2, broken using above-mentioned
Road device fracture dynamic electric voltage distribution measuring connection circuit, comprises the following steps：
To chopper T0, the D.C. resistance under varying environment operating mode measures step 1.；
Step 2. chopper T0 keeps separating brake, and protective breaker AB before test, CD all keep closing a floodgate, firing test, great Rong
After amount short-circuit generator G boosts to predetermined value, closing switch HK closes a floodgate, and records exchange respectively on 3 potentiometer V1, V2, V3
Voltage, after keeping voltage waveform at least 100ms, protective breaker T0 separating brake, the test voltage waveform during record, by reading
The virtual value of the alternating voltage that 3 potentiometer V1, V2, V3 record, the AC compounent of at least two fracture voltages when obtaining test
Distribution relation；
Step 3. chopper T0, protective breaker AB, keep closing a floodgate before CD test, firing test, and Large Copacity short circuit generates electricity
After machine G boosts to predetermined value, closing switch HK closes a floodgate, and connects low-pressure side and high-pressure side test loop.Subsequently chopper T0 separating brake,
Cut-off capacity current, the mains side at chopper T0 two ends and load-side produce alternating voltage and DC voltage respectively, by 3
Voltage waveform is recorded on potentiometer V1, V2, V3, after keeping cut-offfing rear voltage waveform at least 300ms, protective breaker AB, CD divide
Lock, off-test；
Step 4. adopts different filthy equivalent resistance Z1, Z2, Z3, repeats above step 1 to 3, records different filths etc.
Fracture combined-voltage distribution situation under effect environmental condition.
As a specific embodiment, the Measuring DC Resistance of described step 1 is：Apply straight in one end of chopper
Stream voltage, the other end accesses ammeter and carries out reading, obtains D.C. resistance according to DC voltage and electric current.
As a specific embodiment, described step 4 using the method by manually defiling change filthy equiva lent impedance Z1,
Z2、Z3.
Below using certain experimental station 500kV chopper alternating current-direct current dynamic electric voltage distribution situation experiment with measuring example as the present invention
The explanation of beneficial effect.
According to GB 1984-2014《High-voltage AC breaker》With regard to the test of capacitive current switching test in clause 6.111
The requirement of method, the test voltage of capacitive current switching test, for single-phase test, is system phase voltage and capacitive voltage coefficient
Product, for the chopper test item of 500kV rated voltage, line voltage is 550kV, and phase voltage is 550/ √ 3=318kV,
Capacitive voltage coefficient is test voltage when 1.2 is 318 × 1.2=381.6kV.
When above-mentioned chopper is tested, in four steps voltage's distribiuting is measured and revise, and finally draw
Distribution results.
First, chopper T0 each fracture direct current resistance m easurem ent
By the method such as manually defile, to chopper, the D.C. resistance under varying environment operating mode measures, in chopper
One end of T0 applies DC voltage, and the other end accesses ammeter and carries out reading.
Secondly, chopper T0 alternating voltage distribution situation measures
Chopper T0 measures to the alternating voltage of its each Fracture Characteristics point under gate-dividing state.Chopper T0 is in test
In be always maintained at gate-dividing state, by the boosted transformator of short-circuit generator to chopper T0 apply ac test voltage, to each point
Voltage waveform recorded.
Then, chopper T0 combined-voltage combined measurement
Chopper T0 cuts capacitive load, and the alterating and direct current corrugating of its each Fracture Characteristics point is measured.Chopper tries
Test front "on" position, in test control separating brake, capacitive load currents are cut-off, the voltage waveform of each point is remembered
Record, referring to Fig. 3.
Finally, change the filthy equivalent resistance of chopper, and repeat above step, record different filth conditions referring to Fig. 4 a
Under the conditions of being two kinds of filths with Fig. 4 b, i.e. the breaker fracture alternating current-direct current dynamic electric voltage distribution feelings of different filth equivalent resistance combinations
The test waveform figure of condition, off-test.
Above-described embodiment simply to illustrate that the technology design of the present invention and feature, its objective is to be to allow in the art
Those of ordinary skill will appreciate that present disclosure and implements according to this, can not be limited the scope of the invention with this.All
It is the equivalent change or modification made according to the essence of present invention, all should cover within the scope of the present invention.
Claims (7)
1. a kind of breaker fracture dynamic electric voltage distribution measuring connection circuit is it is characterised in that include：
Large Copacity short-circuit generator G, in order to simulate electric power system power source, offer Large Copacity power supply in short-term；
Booster transformer T, its primary side series connection Large Copacity short-circuit generator G, primary side is sequentially connected in series breaker protector AB, exchange
Wave filter chopper T0 and capacitive load C；
Large Copacity short-circuit generator G is also in series with closing switch HK and protective breaker CD；
Described protective breaker AB two ends filth in parallel equiva lent impedance Z1, alternating current filter chopper T0 two ends parallel connection filth etc.
Effect impedance Z 2；
In public one end being terminated with potentiometer V2 of filthy equiva lent impedance Z1 and filthy equiva lent impedance Z2, in filthy equiva lent impedance
Another one end being terminated with potentiometer V1 of Z1, in another one end being terminated with potentiometer V3 of filthy equiva lent impedance Z2, described
Potentiometer V1, potentiometer V2, potentiometer V3 each other end ground connection, described potentiometer V2 is parallel with filthy equiva lent impedance Z3.
2. breaker fracture dynamic electric voltage distribution measuring connection circuit according to claim 1 is it is characterised in that described friendship
Stream wave filter chopper T0 is 550kV and above porcelain knob breaker, and this porcelain knob breaker includes at least
Two fractures.
3. breaker fracture dynamic electric voltage distribution measuring connection circuit according to claim 1 is it is characterised in that described appearance
Property load C includes Capacitor stack and load resistance.
4. breaker fracture dynamic electric voltage distribution measuring connection circuit according to claim 1 is it is characterised in that described point
Depressor V1, potentiometer V2 and potentiometer V3 adopt capacitance-resistance series-parallel connection partial pressure mode.
5. a kind of breaker fracture dynamic electric voltage distribution measurement method, is broken using the chopper described in any one of claim 1-4
Mouth dynamic electric voltage distribution measuring connection circuit is it is characterised in that comprise the following steps：
To chopper T0, the D.C. resistance under varying environment operating mode measures step 1.；
Step 2. chopper T0 keeps separating brake, and protective breaker AB before test, CD all keep closing a floodgate, firing test, and Large Copacity is short
After road generator G boosts to predetermined value, closing switch HK closes a floodgate, respectively in 3 potentiometer V1、V2、V3On record alternating voltage,
After keeping voltage waveform at least 100ms, protective breaker T0 separating brake, the test voltage waveform during record, by reading 3 points
The virtual value of the alternating voltage that depressor V1, V2, V3 record, the distribution of the AC compounent of at least two fracture voltages when obtaining test
Relation；
Step 3. chopper T0, protective breaker AB, keep closing a floodgate before CD test, firing test, Large Copacity short-circuit generator G liter
After being depressed into predetermined value, closing switch HK closes a floodgate, and connects low-pressure side and high-pressure side test loop.Subsequently chopper T0 separating brake, cut-offs
Capacity current, the mains side at chopper T0 two ends and load-side produce alternating voltage and DC voltage respectively, by 3 partial pressures
Device V1、V2、V3On record voltage waveform, after keeping cut-offfing rear voltage waveform at least 300ms, protective breaker AB, CD separating brake, examination
Test end；
Step 4 adopts different filthy equivalent resistance Z1, Z2, Z3, repeats above step 1 to 3, records different filth equivalent environment
Under the conditions of fracture combined-voltage distribution situation.
6. breaker fracture dynamic electric voltage distribution measurement method according to claim 5 is it is characterised in that described step 1
Measuring DC Resistance be：Apply DC voltage in one end of chopper, the other end accesses ammeter and carries out reading, according to
DC voltage and electric current obtain D.C. resistance.
7. breaker fracture dynamic electric voltage distribution measurement method according to claim 5 is it is characterised in that described step 4
Filthy equiva lent impedance Z1, Z2, Z3 are changed using the method by manually defiling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610878398.8A CN106405402B (en) | 2016-09-30 | 2016-09-30 | Circuit breaker fracture dynamic voltage distribution measurement wiring loop and measurement method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610878398.8A CN106405402B (en) | 2016-09-30 | 2016-09-30 | Circuit breaker fracture dynamic voltage distribution measurement wiring loop and measurement method |
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| CN106405402A true CN106405402A (en) | 2017-02-15 |
| CN106405402B CN106405402B (en) | 2023-05-16 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107748325A (en) * | 2017-10-19 | 2018-03-02 | 国网山西省电力公司检修分公司 | Super breaker in extra high voltage switching-on resistance tester |
| CN108226771A (en) * | 2017-12-20 | 2018-06-29 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring method |
| CN108896907A (en) * | 2018-08-27 | 2018-11-27 | 云南电网有限责任公司电力科学研究院 | A kind of the branch wire time test device and method of double break circuit breaker |
| CN108919109A (en) * | 2018-07-10 | 2018-11-30 | 武汉大学 | A kind of multi-break high voltage direct current Fast mechanical switch dynamic voltage balancing simulation experiment method |
| CN109115860A (en) * | 2017-06-22 | 2019-01-01 | 台湾积体电路制造股份有限公司 | The detection method of electroplating technology |
| CN109406989A (en) * | 2018-11-12 | 2019-03-01 | 深圳和而泰小家电智能科技有限公司 | A kind of load circuit detection method, load detecting circuit and electronic equipment |
| CN111273166A (en) * | 2018-12-05 | 2020-06-12 | 西安高压电器研究院有限责任公司 | Little inductive current of isolator test circuit that opens and shuts |
| CN111273167A (en) * | 2018-12-05 | 2020-06-12 | 西安高压电器研究院有限责任公司 | Little inductive current of isolator test circuit that opens and shuts |
| CN111812494A (en) * | 2020-06-18 | 2020-10-23 | 许继电气股份有限公司 | Intelligent circuit breaker online monitoring and electric service life assessment method |
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| WO2016107509A1 (en) * | 2014-12-29 | 2016-07-07 | 国家电网公司 | Breaking testing device for high-voltage direct-current circuit breaker, and testing method therefor |
| CN105785247A (en) * | 2016-04-29 | 2016-07-20 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Circuit-breaker alternating current and direct current mixing voltage withstanding wiring loop used for alternating current filter and test method thereof |
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| GB668138A (en) * | 1949-02-03 | 1952-03-12 | Vickers Electrical Co Ltd | Improvements in and relating to testing of electric switches and circuit breakers |
| WO2016107509A1 (en) * | 2014-12-29 | 2016-07-07 | 国家电网公司 | Breaking testing device for high-voltage direct-current circuit breaker, and testing method therefor |
| CN105785247A (en) * | 2016-04-29 | 2016-07-20 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Circuit-breaker alternating current and direct current mixing voltage withstanding wiring loop used for alternating current filter and test method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109115860A (en) * | 2017-06-22 | 2019-01-01 | 台湾积体电路制造股份有限公司 | The detection method of electroplating technology |
| CN109115860B (en) * | 2017-06-22 | 2021-01-08 | 台湾积体电路制造股份有限公司 | Detection method of electroplating process |
| CN107748325A (en) * | 2017-10-19 | 2018-03-02 | 国网山西省电力公司检修分公司 | Super breaker in extra high voltage switching-on resistance tester |
| CN108226771A (en) * | 2017-12-20 | 2018-06-29 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring method |
| CN108919109A (en) * | 2018-07-10 | 2018-11-30 | 武汉大学 | A kind of multi-break high voltage direct current Fast mechanical switch dynamic voltage balancing simulation experiment method |
| CN108919109B (en) * | 2018-07-10 | 2021-05-18 | 武汉大学 | Dynamic voltage-sharing simulation test method for multi-fracture high-voltage direct-current quick mechanical switch |
| CN108896907A (en) * | 2018-08-27 | 2018-11-27 | 云南电网有限责任公司电力科学研究院 | A kind of the branch wire time test device and method of double break circuit breaker |
| CN108896907B (en) * | 2018-08-27 | 2024-01-23 | 云南电网有限责任公司电力科学研究院 | Switching-on and switching-off time testing device and method for double-break circuit breaker |
| CN109406989A (en) * | 2018-11-12 | 2019-03-01 | 深圳和而泰小家电智能科技有限公司 | A kind of load circuit detection method, load detecting circuit and electronic equipment |
| CN109406989B (en) * | 2018-11-12 | 2024-04-16 | 深圳和而泰小家电智能科技有限公司 | Load loop detection method, load detection circuit and electronic equipment |
| CN111273166A (en) * | 2018-12-05 | 2020-06-12 | 西安高压电器研究院有限责任公司 | Little inductive current of isolator test circuit that opens and shuts |
| CN111273167A (en) * | 2018-12-05 | 2020-06-12 | 西安高压电器研究院有限责任公司 | Little inductive current of isolator test circuit that opens and shuts |
| CN111273167B (en) * | 2018-12-05 | 2022-06-03 | 西安高压电器研究院股份有限公司 | Little inductive current of isolator test circuit that opens and shuts |
| CN111812494A (en) * | 2020-06-18 | 2020-10-23 | 许继电气股份有限公司 | Intelligent circuit breaker online monitoring and electric service life assessment method |
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| CN106405402B (en) | 2023-05-16 |
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