CN108646125A - A kind of test method of capacitance current, apparatus and system - Google Patents
A kind of test method of capacitance current, apparatus and system Download PDFInfo
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- CN108646125A CN108646125A CN201810210672.3A CN201810210672A CN108646125A CN 108646125 A CN108646125 A CN 108646125A CN 201810210672 A CN201810210672 A CN 201810210672A CN 108646125 A CN108646125 A CN 108646125A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
The present invention provides a kind of test method of capacitance current, apparatus and system, method includes：The primary side of electromagnetic potential transformer is held with a phases of switch cabinet electrified instruction device, b phases are held and c phases are held and are electrically connected；The high frequency voltage module of capacitance current test device exports preset non-power-frequency current signal；Test module obtains the alien frequencies voltage of electromagnetic potential transformer secondary side under non-power-frequency current signal；According to the alien frequencies voltage, non-power-frequency current and the capacitance for charging indication sensor, the total ground capacitance and capacitive earth current of isolated neutral system is calculated.The present invention dexterously injects using the open delta of electromagnetic potential transformer and measures alien frequencies signal, compared to being directly injected into signal, has safe, strong antijamming capability measures the features such as facilitating.This method test loop is simple, is not necessarily to power failure, is safe, is suitable for isolated neutral system capacitance current and tests.
Description
Technical field
This disclosure relates to technical field of power systems more particularly to a kind of test method of capacitance current, apparatus and system.
Background technology
Isolated neutral system, the electric current that fault point is flowed through when circuit single-phase earthing are that line mutual-ground capacitor generates
Capacitance current.The failure of isolated neutral system is mostly to have capacitance current when due to circuit single-phase earthing excessive, electricity
Arc is not easy caused by self-extinguishment.Electric system regulation in China's should be filled when 10kV and 35kV system capacitive currents are more than 30A and 10A
If arc suppression coil compensation capacitance current, to determine the compensation capacity of arc suppression coil, capacitance current test should be carried out.In addition, to test
Whether ferromagnetic resonance can occur between card non-effectively earthed system electromagnetic potential transformer PT and circuit stray capacitance, it is also necessary to survey
Measure system capacitive current.
Common neutral point capacitive current testing methods have a direct method of measurement and the indirect method of measurement, and the direct method of measurement is by certain phase line list
Mutually ground connection is directly measured；The indirect method of measurement mainly offsets the additional capacitance method of capacitance method, neutral point and alien frequencies method etc..So
And direct method measures capacitance current, when experiment, should directly contact with high pressure, and power grid and life security risk are larger.Between current
Measurement method is connect, if that there are part systems is smaller without neutral point or neutral excursion voltage for the additional capacitance method of neutral point, was measured
Security risk when singlephase earth fault occurs in journey；Alien frequencies method usually electromagnetic potential transformer open-triangular winding into
Row measures, and when measurement should remove or short circuit resonance eliminator, and electromagnetic potential transformer is needed to have a power failure, and test job becomes complicated, very
Extremely ferromagnetic resonance risk is brought to system.Therefore, for capacitance current test, it is necessary to find not only safety but also easy test.
Invention content
A kind of test method of capacitance current, apparatus and system are provided in the embodiment of the present invention, to solve the prior art
Problem cumbersome, safety is poor.
The present invention provides a kind of test devices of capacitance current, including power module, high frequency power module, electric current to export
Module, test module, capacitance current computing module and electromagnetic potential transformer, one end electrical connection of the high frequency power module
The power module, the other end are electrically connected the input terminal of the current output module and the test module, the test
The other end of module is electrically connected the capacitance current computing module, the secondary side of the electromagnetic potential transformer and the electric current
The output end of output module is electrically connected, the primary side of the electromagnetic potential transformer and a phases of switch cabinet electrified instruction device
End, b phases hold and hold electrical connection with c phases.
Preferably, the current output module includes calibrating terminal m and ground terminal o, calibrating terminal m and the electromagnetic type
One end of voltage transformer secondary side open delta is electrically connected；The ground terminal o and the electromagnetic potential transformer are secondary
The other end of side opening triangle is electrically connected.
Preferably, described device further includes display module, and the display module is another with the capacitance current computing module
One end is electrically connected.
The present invention also provides a kind of test systems of capacitance current, including the device described in above-mentioned any one, also wrap
Include three phase mains, electrification indication sensor and switch cabinet electrified instruction device, a phases of the switch cabinet electrified instruction device
End, b phases hold and c phases hold by the electrification indication sensor respectively with the A phases source E in the three phase mains1, B phases source E2And C
Phase source E3Electrical connection, when test, the primary side of electromagnetic potential transformer (6) holds with a phases of switch cabinet electrified instruction device, b
Electrical connection is held with c phases in phase end.
The present invention also provides a kind of test methods of capacitance current, include the following steps：
By the primary side of electromagnetic potential transformer and a phases of switch cabinet electrified instruction device are held, b phases are held and c phases hold electricity
Connection；
The high frequency voltage module for controlling capacitance current test device exports preset non-power-frequency current signal；
Test module obtains the alien frequencies voltage u of electromagnetic potential transformer secondary side under non-power-frequency current signalo；
According to the alien frequencies voltage uo, non-power-frequency current i0And the capacitance of electrification indication sensor, neutral point is calculated not
The total ground capacitance C of earthed system0；
According to the total ground capacitance C0, capacitive earth current I is calculatedc。
Preferably, a certain current value i of the non-power-frequency current signal between 0.1mA~100mA0, the non-power-frequency current
A certain frequency values of the frequency of signal between 0.2k~1000kHz.
Preferably, the total ground capacitance C0Calculation formula be：
Wherein, C11For the corresponding A phases capacitance of switch cabinet electrified indication sensor, C21For the corresponding A phases of charge indicating device
Capacitance, n1The number of turns, n for electromagnetic potential transformer first winding2The number of turns, ω for electromagnetic potential transformer secondary winding1
For the angular frequency of the non-power-frequency current signal of input.
Preferably, the capacitive earth current IcCalculation formula be：
Wherein, ω2For system under test (SUT) angular frequency,For the phase voltage of system under test (SUT).
The application's has the beneficial effect that：
The present invention provides a kind of test method of capacitance current, apparatus and system, device includes power module, high-frequency electrical
Source module, current output module, test module and capacitance current computing module and electromagnetic potential transformer, the high frequency electric source
One end of module is electrically connected the power module, and the other end is electrically connected the input terminal of the current output module and the survey
The other end of die trial block, the test module is electrically connected the capacitance current computing module, the electromagnetic potential transformer
Secondary side is electrically connected with the output end of the current output module, primary side and the switchgear band of the electromagnetic potential transformer
The a phases of electric instruction device are held, b phases hold and hold electrical connection with c phases.Wherein, power module is used for other module for power supply for the present apparatus；
High frequency power module is for generating non-power-frequency current signal；Current output module gives electrification instruction dress for exporting non-power-frequency current signal
The derided capacitors set；Measurement module is used for testing the voltage and circuit total current of current output module；Capacitance current computing module
For calculating capacitance current according to preset formula, electromagnetic potential transformer, which is used to inject to switch cabinet electrified instruction device, to be believed
Number.The present invention dexterously injects using the open delta of electromagnetic potential transformer and measures alien frequencies signal, compared to directly note
Enter signal, have it is safe, strong antijamming capability measures the features such as facilitating.Present apparatus test loop is simply not necessarily to have a power failure, peace
Quan Xinggao is suitable for isolated neutral system capacitance current and tests.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the present invention
Example, and be used to explain the principle of the present invention together with specification.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, other drawings may also be obtained based on these drawings.
Fig. 1 is that a kind of capacitance current based on switch cabinet electrified instruction device provided by the embodiments of the present application tests system
Electric hookup；
Fig. 2 is that a kind of system direct-to-ground capacitance provided by the embodiments of the present application measures electrical equivalent loop diagram；
Fig. 3 is a kind of structural schematic diagram of capacitance current test device provided by the embodiments of the present application；
Fig. 4 is a kind of method flow diagram of neutral point capacitive current testing methods provided by the embodiments of the present application.
Specific implementation mode
In order to make those skilled in the art more fully understand the technical solution in the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work, should all belong to protection of the present invention
Range.
It please refers to Fig.1 with 2, shown is respectively provided by the embodiments of the present application a kind of based on switch cabinet electrified instruction device
Capacitance current tests the electric hookup of system and a kind of system direct-to-ground capacitance measures electrical equivalent loop diagram.It can by Fig. 1 and 2
See, which includes isolated neutral system and corresponding capacitance current test device, and isolated neutral system is
The system under test (SUT) of capacitance current test device.Three phase mains (the A phases source E of system under test (SUT)1, B phases source E2With C phases source E3) on respectively
It is electrically connected with electrification indication sensor, electrification indication sensor is electrically connected with switch cabinet electrified instruction device.Switch cabinet electrified refers to
Whether showing device charges commonly used in monitoring switchgear, such as charges, then sends out alarm signal or electric blocking door of switch cabinet,
To prompt staff's switch cabinet electrified, cabinet door cannot be opened.
Electrification indication sensor respectively includes and each corresponding A phases capacitance C11, B phase capacitances C12With C phase capacitances C13, open
It includes respectively including and each corresponding A phases capacitance C to close cabinet charge indicating device21, B phase capacitances C22With C phase capacitances C23, capacitance
C11With capacitance C21Electrical connection, capacitance C12With capacitance C22Electrical connection, capacitance C13With capacitance C23Electrical connection.Capacitance C21, capacitance C22With
Capacitance C23With C11、C12、C13Cooperation partial pressure, to ensure the voltage on electrification indicator light.
Capacitance current test device provided by the present application includes calibrating terminal m and ground terminal o, the calibrating terminal m point
Do not held with a phases of switch cabinet electrified instruction device, b phases are held and c phases are held and are electrically connected, the ground terminal o refers to switch cabinet electrified
The ground terminal of showing device is electrically connected, and calibrating terminal m is used to inject the test of non-power-frequency current signal and three-phase current to system.
Referring to FIG. 3, showing a kind of structural schematic diagram of capacitance current test device provided by the embodiments of the present application.By
Fig. 3 is as it can be seen that the capacitance current test device includes power module 1, high frequency power module 2, current output module 3, test module 4
It is electrically connected the power supply with one end of capacitance current computing module 5 and electromagnetic potential transformer 6, the high frequency power module 2
Module 1, the other end are electrically connected current output module 3 and test module 4, and the test module 4 is also electrically connected capacitance
Current calculation module 5 and electromagnetic potential transformer 6.Wherein, power module 1 is power supply module, for other for the present apparatus
Module for power supply, power module 1 can be the element with function of supplying power such as accumulator；High frequency power module 2 is for generating alien frequencies
Current signal, such as frequency converter；Current output module 3 is used to export partial pressure electricity of the non-power-frequency current signal to charge indicating device
Hold, current output module 3 includes calibrating terminal m and ground terminal o, is used for a certain frequency between 0.2k~1000kHz
Non-power-frequency current signal is injected separately into the derided capacitors (C of A phase, B phase, C phase charge indicating device21、C22、C23)；Measurement module 4 is used
Voltage, circuit total current in test current output module 3, measurement module 4 can be the survey for having voltage, current detection function
Try device；Capacitance current computing module 5 is used for, according to pre-set programs and formula, calculating capacitance current, capacitance current computing module 5 can
To be the microprocessor with calculation processing function such as MCU, electromagnetic potential transformer 6 to switch cabinet electrified for indicating to fill
Set Injection Signal.
The present invention dexterously injects using the open delta of electromagnetic potential transformer and measures alien frequencies signal, compared to straight
Connect Injection Signal, have it is safe, strong antijamming capability measures the features such as facilitating.Present apparatus test loop is simply without stopping
Electricity, it is safe, it is suitable for isolated neutral system capacitance current and tests.
In addition, in the application other embodiment, which can also include display module 7, show mould
Block 7 is electrically connected with the other end of capacitance current computing module 5, the capacitance calculated for showing capacitance current computing module 5
Current values, in the present embodiment, display module 7 can be the display for having display function.
Based on above-mentioned capacitance current test device, present invention also provides a kind of test methods of capacitance current.It please refers to
Fig. 4 show a kind of method flow diagram of neutral point capacitive current testing methods provided by the embodiments of the present application.From fig. 4, it can be seen that this includes
Following steps：
Step S100：By the primary side of electromagnetic potential transformer and a phases of switch cabinet electrified instruction device are held, b phases are held
Electrical connection is held with c phases.
Step S200：The high frequency voltage module for controlling capacitance current test device exports preset non-power-frequency current signal.Institute
State a certain current value i of the non-power-frequency current signal between 0.1mA~100mA0, the frequency of the non-power-frequency current signal be 0.2k~
A certain frequency values between 1000kHz.
Step S300：Test module obtains the alien frequencies voltage of electromagnetic potential transformer secondary side under non-power-frequency current signal
uo。
Step S400：According to the alien frequencies voltage uo, non-power-frequency current i0And the capacitance of electrification indication sensor, it calculates
To the total ground capacitance C of isolated neutral system0。
The electrical equivalent loop diagram that there is provided according to fig. 2 as it can be seen that switch cabinet electrified indication sensor capacitance (C11、C12、C13)
And capacitance (the C of charge indicating device21、C22、C23) it is known that and C12≈C13≈C11、C22≈C23≈C21、C0=Ca//Cb//Cc。
Therefore, C can be calculated by formula (formula 1)0, specific calculation formula is：
Wherein, C11For the corresponding A phases capacitance of switch cabinet electrified indication sensor, C21For the corresponding A phases of charge indicating device
Capacitance, n1The number of turns, n for electromagnetic potential transformer first winding2The number of turns, ω for electromagnetic potential transformer secondary winding1
For the angular frequency of the non-power-frequency current signal of input.
Step S500：According to the total ground capacitance C0, capacitive earth current I is calculatedc, specific calculation formula is：
Wherein, ω2For system under test (SUT) angular frequency, usually definite value, 50Hz；For system under test (SUT) phase voltage.
Capacitance current test device provided by the invention and the test method based on capacitance current test device have examination
The advantages that circuit is simple, is not necessarily to have a power failure, safe is tested, is suitable for isolated neutral system capacitance current and tests.
Each embodiment in this specification is described in a progressive manner, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for device or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.Apparatus and system embodiment described above is only schematical, wherein as separation
The unit of part description may or may not be physically separated, the component shown as unit can be or
It can not be physical unit, you can be located at a place, or may be distributed over multiple network units.It can be according to reality
Border needs to select some or all of module therein to achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art
Without creative efforts, you can to understand and implement.
It the above is only the specific implementation mode of the present invention, it is noted that those skilled in the art are come
It says, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (8)
1. a kind of test device of capacitance current, which is characterized in that including power module (1), high frequency power module (2), electric current
Output module (3), test module (4), capacitance current computing module (5) and electromagnetic potential transformer (6), the high frequency electric source
One end of module (2) is electrically connected the power module (1), and the other end is electrically connected the input of the current output module (3)
The other end of end and the test module (4), the test module (4) is electrically connected the capacitance current computing module (5), described
The secondary side of electromagnetic potential transformer (6) is electrically connected with the output end of the current output module (3), the electromagnetic potential
The primary side of mutual inductor (6) is held with a phases of switch cabinet electrified instruction device, b phases are held and c phases are held and are electrically connected.
2. the apparatus according to claim 1, which is characterized in that the current output module (3) includes calibrating terminal m and connects
Ground terminal o, calibrating terminal m are electrically connected with one end of the electromagnetic potential transformer (6) secondary side open delta；The ground connection
Terminal o is electrically connected with the other end of the electromagnetic potential transformer (6) secondary side open delta.
3. the apparatus according to claim 1, which is characterized in that described device further includes display module (7), the display mould
Block (7) is electrically connected with the other end of the capacitance current computing module (5).
4. a kind of test system of capacitance current, which is characterized in that include the device as described in claim 1-3 any one,
Further include three phase mains, electrification indication sensor and switch cabinet electrified instruction device, a of the switch cabinet electrified instruction device
Xiang Duan, b phase are held and c phases hold by the electrification indication sensor respectively with the A phases source E in the three phase mains1, B phases source E2With
C phases source E3Electrical connection, when test, the primary side of electromagnetic potential transformer (6) holds with a phases of switch cabinet electrified instruction device, b
Electrical connection is held with c phases in phase end.
5. a kind of test method of capacitance current, which is characterized in that include the following steps：
The primary side of electromagnetic potential transformer is held with a phases of switch cabinet electrified instruction device, b phases are held and c phases are held and are electrically connected；
The high frequency voltage module for controlling capacitance current test device exports preset non-power-frequency current signal；
Test module obtains the alien frequencies voltage u of electromagnetic potential transformer secondary side under non-power-frequency current signalo；
According to the alien frequencies voltage uo, non-power-frequency current i0And the capacitance of electrification indication sensor, isolated neutral is calculated
The total ground capacitance C of system0；
According to the total ground capacitance C0, capacitive earth current I is calculatedc。
6. according to the method described in claim 5, it is characterized in that, the non-power-frequency current signal is between 0.1mA~100mA
A certain current value i0, a certain frequency values of the frequency of the non-power-frequency current signal between 0.2k~1000kHz.
7. according to the method described in claim 5, it is characterized in that, the total ground capacitance C0Calculation formula be：
Wherein, C11For the corresponding A phases capacitance of switch cabinet electrified indication sensor, C21For the corresponding A phases capacitance of charge indicating device,
n1The number of turns, n for electromagnetic potential transformer first winding2The number of turns, ω for electromagnetic potential transformer secondary winding1It is defeated
The angular frequency of the non-power-frequency current signal entered.
8. the method according to the description of claim 7 is characterized in that the capacitive earth current IcCalculation formula be：
Wherein, ω2For system under test (SUT) angular frequency,For the phase voltage of system under test (SUT).
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| CN201810210672.3A CN108646125B (en) | 2018-03-14 | 2018-03-14 | Method, device and system for testing capacitance current |
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| CN201810210672.3A CN108646125B (en) | 2018-03-14 | 2018-03-14 | Method, device and system for testing capacitance current |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444793A (en) * | 2018-11-21 | 2019-03-08 | 国网陕西省电力公司电力科学研究院 | One or two fusion intelligent switch high-frequency conduction disturbed test emulation modes of power distribution network |
| CN109782055A (en) * | 2019-04-02 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of isolated neutral system capacitance current measurement method and device |
| CN109901019A (en) * | 2019-04-02 | 2019-06-18 | 云南电网有限责任公司电力科学研究院 | A kind of resonant earthed system capacitance current measurement method and device |
| CN114844519A (en) * | 2022-04-06 | 2022-08-02 | 杭州海康威视数字技术股份有限公司 | Isolating device for intrinsic safety circuit and non-intrinsic safety circuit |
| CN115060997A (en) * | 2022-06-22 | 2022-09-16 | 云南电网有限责任公司电力科学研究院 | Coil testing method, voltage transformer, system, computer device and medium |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201514437U (en) * | 2009-09-30 | 2010-06-23 | 商洛供电局 | Distribution network capacitance current test instrument |
| CN202231310U (en) * | 2011-10-09 | 2012-05-23 | 川铁电气（天津）集团有限公司 | 10kV outdoor manual alternative current high-voltage isolation switch cabinet |
| CN103063901A (en) * | 2012-12-28 | 2013-04-24 | 上海市电力公司 | Pilot frequency injection detection method of power grid ungrounded system busbar capacitance current |
| CN203522175U (en) * | 2013-09-06 | 2014-04-02 | 天津市东宝电气科技有限公司 | Novel arc suppression coil grounding compensation device |
| CN203519768U (en) * | 2013-10-17 | 2014-04-02 | 中国神华能源股份有限公司 | Traveling-wave signal extraction equipment and system for single-phase earth fault |
| CN203773010U (en) * | 2014-03-04 | 2014-08-13 | 国联思创（北京）科技有限公司 | Partial discharge on-line monitoring instrument based on switch cabinet charge indicator |
| CN204330857U (en) * | 2014-09-30 | 2015-05-13 | 国家电网公司 | A kind of isolated neutral system capacitance current proving installation |
| CN104880652A (en) * | 2015-05-28 | 2015-09-02 | 深圳供电局有限公司 | Switch cabinet live-line partial discharge test system and voltage signal extraction device thereof |
| CN205484509U (en) * | 2016-03-07 | 2016-08-17 | 云南电网有限责任公司玉溪供电局 | Electric wire netting capacitance current online test system |
| CN205786876U (en) * | 2016-06-27 | 2016-12-07 | 国网甘肃省电力公司白银供电公司 | A kind of general phase-difference type switch cabinet phasing device |
| US20170012036A1 (en) * | 2015-07-10 | 2017-01-12 | Nxp B.V. | Electrostatic Discharge Protection Device Comprising a Silicon Controlled Rectifier |
| CN205910263U (en) * | 2016-06-27 | 2017-01-25 | 国网河南省电力公司新乡供电公司 | Earth -free distribution network capacitance current measurement system of neutral point |
| CN206020509U (en) * | 2016-08-31 | 2017-03-15 | 淮北工科检测检验有限公司 | A kind of capacitance current tacheometer |
-
2018
- 2018-03-14 CN CN201810210672.3A patent/CN108646125B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201514437U (en) * | 2009-09-30 | 2010-06-23 | 商洛供电局 | Distribution network capacitance current test instrument |
| CN202231310U (en) * | 2011-10-09 | 2012-05-23 | 川铁电气（天津）集团有限公司 | 10kV outdoor manual alternative current high-voltage isolation switch cabinet |
| CN103063901A (en) * | 2012-12-28 | 2013-04-24 | 上海市电力公司 | Pilot frequency injection detection method of power grid ungrounded system busbar capacitance current |
| CN203522175U (en) * | 2013-09-06 | 2014-04-02 | 天津市东宝电气科技有限公司 | Novel arc suppression coil grounding compensation device |
| CN203519768U (en) * | 2013-10-17 | 2014-04-02 | 中国神华能源股份有限公司 | Traveling-wave signal extraction equipment and system for single-phase earth fault |
| CN203773010U (en) * | 2014-03-04 | 2014-08-13 | 国联思创（北京）科技有限公司 | Partial discharge on-line monitoring instrument based on switch cabinet charge indicator |
| CN204330857U (en) * | 2014-09-30 | 2015-05-13 | 国家电网公司 | A kind of isolated neutral system capacitance current proving installation |
| CN104880652A (en) * | 2015-05-28 | 2015-09-02 | 深圳供电局有限公司 | Switch cabinet live-line partial discharge test system and voltage signal extraction device thereof |
| US20170012036A1 (en) * | 2015-07-10 | 2017-01-12 | Nxp B.V. | Electrostatic Discharge Protection Device Comprising a Silicon Controlled Rectifier |
| CN205484509U (en) * | 2016-03-07 | 2016-08-17 | 云南电网有限责任公司玉溪供电局 | Electric wire netting capacitance current online test system |
| CN205786876U (en) * | 2016-06-27 | 2016-12-07 | 国网甘肃省电力公司白银供电公司 | A kind of general phase-difference type switch cabinet phasing device |
| CN205910263U (en) * | 2016-06-27 | 2017-01-25 | 国网河南省电力公司新乡供电公司 | Earth -free distribution network capacitance current measurement system of neutral point |
| CN206020509U (en) * | 2016-08-31 | 2017-03-15 | 淮北工科检测检验有限公司 | A kind of capacitance current tacheometer |
Non-Patent Citations (1)
| Title |
|---|
| JIANG NAN 等: "A new method of measuring capacitance current in non-effective grounding power system", 《2016 INTERNATIONAL CONFERENCE ON CONDITION MONITORING AND DIAGNOSIS (CMD)》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444793A (en) * | 2018-11-21 | 2019-03-08 | 国网陕西省电力公司电力科学研究院 | One or two fusion intelligent switch high-frequency conduction disturbed test emulation modes of power distribution network |
| CN109782055A (en) * | 2019-04-02 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of isolated neutral system capacitance current measurement method and device |
| CN109901019A (en) * | 2019-04-02 | 2019-06-18 | 云南电网有限责任公司电力科学研究院 | A kind of resonant earthed system capacitance current measurement method and device |
| CN114844519A (en) * | 2022-04-06 | 2022-08-02 | 杭州海康威视数字技术股份有限公司 | Isolating device for intrinsic safety circuit and non-intrinsic safety circuit |
| CN114844519B (en) * | 2022-04-06 | 2023-10-10 | 杭州海康威视数字技术股份有限公司 | Isolation device for intrinsic safety circuit and non-intrinsic safety circuit |
| CN115060997A (en) * | 2022-06-22 | 2022-09-16 | 云南电网有限责任公司电力科学研究院 | Coil testing method, voltage transformer, system, computer device and medium |
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