CN108548982A - 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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- CN108548982A CN108548982A CN201810209567.8A CN201810209567A CN108548982A CN 108548982 A CN108548982 A CN 108548982A CN 201810209567 A CN201810209567 A CN 201810209567A CN 108548982 A CN108548982 A CN 108548982A
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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 calibrating terminal m of capacitance current test device current output module is held with a phases of switch cabinet electrified instruction device respectively, b phases are held and c phases are held and are electrically connected, the ground terminal o of capacitance current test device current output module is electrically connected with the ground terminal of switch cabinet electrified instruction device；The high frequency voltage module for controlling capacitance current test device exports non-power-frequency current signal；Test module obtains alien frequencies voltage of the current output module under non-power-frequency current；According to the alien frequencies voltage under the non-power-frequency current signal and the non-power-frequency current, the total ground capacitance of isolated neutral system is calculated；According to the total ground capacitance, capacitive earth current is calculated.This method has many advantages, such as that test loop is simple, can calculate separately out electric system per relatively capacitance, without having a power failure, 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
One end of module, test module and capacitance current computing module, the high frequency power module is electrically connected the power module, another
End is electrically connected the current output module and the test module, and the other end of the test module is electrically connected the capacitance
Current calculation module.
Preferably, the current output module include calibrating terminal m and ground terminal o, the calibrating terminal m respectively with open
The a phases of pass cabinet charge indicating device are held, b phases hold and hold electrical connection, the ground terminal o and switch cabinet electrified instruction device with c phases
Ground terminal electrical connection.
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 calibrating terminal m of current output module holds with a phases of switch cabinet electrified instruction device respectively, b
Electrical connection, the ground terminal o of current output module is held to be electrically connected with the ground terminal of switch cabinet electrified instruction device 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 calibrating terminal m of capacitance current test device current output module a with switch cabinet electrified instruction device respectively
Xiang Duan, b phase are held holds electrical connection with c phases, by the ground terminal o and switch cabinet electrified of capacitance current test device current output module
The ground terminal of instruction device is electrically connected；
The high frequency voltage module for controlling capacitance current test device exports preset non-power-frequency current signal；
Test module obtains current output module in non-power-frequency current i0Under alien frequencies voltage uo；
By the calibrating terminal m of capacitance current test device current output module b with switch cabinet electrified instruction device respectively
Electrical connection, test module is held to obtain the non-power-frequency current signal respectively in non-power-frequency current u with c phases in phase endoUnder b phase currents ibAnd c
Phase current ic；
According to the non-power-frequency current signal i0And the non-power-frequency current i0Under alien frequencies voltage uo, neutral point is calculated
The total ground capacitance C of isolated neutral 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, ω1For 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 system under test (SUT) phase voltage.
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
One end of source module, current output module, test module and capacitance current computing module, the high frequency power module is electrically connected institute
Power module is stated, the other end is electrically connected current output module and test module, the other end electrical connection of the test module
Capacitance current computing module.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；The derided capacitors that current output module is used to export non-power-frequency current signal to charge indicating device；Measure mould
Block is used for testing the voltage and circuit total current of current output module；Capacitance current computing module is used for being calculated according to preset formula
Capacitance current.The present invention dexterously utilizes the capacitance (C of the switch cabinet electrified indication sensor generally used11、C12、C13) and band
Capacitance (the C of electric instruction device21、C22、C23), the capacitance current of isolated neutral system is measured, has that test loop is simple, can distinguish
Calculate electric system per relatively capacitance, without having a power failure, it is safe the advantages that, be suitable for isolated neutral system capacitance current and survey
Examination.
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 a kind of electric hookup of the test system of capacitance current provided by the embodiments of the present application；
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 a kind of the electrical of test system of capacitance current provided by the embodiments of the present application
Wiring diagram and a kind of system direct-to-ground capacitance provided by the embodiments of the present application measure electrical equivalent loop diagram.As it can be seen that it should by Fig. 1 and 2
Test system includes isolated neutral system and corresponding capacitance current test device, and isolated neutral system is capacitance electricity
The system under test (SUT) of current test device.In three phase mains (the A phases source E of system under test (SUT)1, B phases source E2With C phases source E3) on be electrically connected respectively
It is connected to electrification indication sensor, electrification indication sensor is electrically connected with switch cabinet electrified instruction device.Switch cabinet electrified instruction dress
It sets commonly used in whether monitoring switchgear charges, such as charges, then alarm signal or electric blocking door of switch cabinet are sent out, to carry
Show 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 electricity
The a phases of connecting switch cabinet charge indicating device are held, b phases are held and held with c phases, the ground terminal o electrical connections switch cabinet electrified instruction
The ground terminal of device, calibrating terminal m are 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 module 1 with one end of capacitance current computing module 5, the high frequency power module 2, the other end is electrically connected respectively
Connect current output module 3 and test module 4, the other end electrical connection capacitance current computing module 5 of the test module 4.Wherein,
Power module 1 is power supply module, and for other module for power supply for the present apparatus, power module 1 can have for accumulator etc. to be supplied
The element of Electricity Functional；High frequency power module 2 is for generating non-power-frequency current signal, such as frequency converter；Current output module 3 is for defeated
Going out derided capacitors of the non-power-frequency current signal to charge indicating device, current output module 3 includes calibrating terminal m and ground terminal o,
For the non-power-frequency current signal of a certain frequency between 0.2k~1000kHz to be injected A phase, B phase, C phase charge indicating device
Derided capacitors (C21、C22、C23)；Measurement module 4 is used for testing the voltage and circuit total current of current output module 3, measurement module
4 can be have voltage, current detection function tester；Capacitance current computing module 5 is used for according to pre-set programs and formula,
Capacitance current is calculated, capacitance current computing module 5 can be the microprocessor that MCU etc. has calculation processing function.
In addition, in the application other embodiment, which can also include display module 6, show mould
Block 6 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 6 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：The calibrating terminal m of capacitance current test device current output module is referred to switch cabinet electrified respectively
The a phases of showing device are held, b phases hold and hold electrical connection with c phases, by the ground terminal o of capacitance current test device current output module with
The ground terminal of switch cabinet electrified instruction device is electrically connected.
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 current output module in non-power-frequency current i0Under alien frequencies voltage uo。
Step S400：According to the non-power-frequency current i0And the non-power-frequency current i0Under alien frequencies voltage uo, in being calculated
The total ground capacitance C of property point isolated neutral system0, 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, ω1For the angular frequency of the non-power-frequency current signal of input.The electrical equivalent loop diagram provided according to fig. 2, switch cabinet electrified refer to
Show the capacitance (C of sensor11、C12、C13), the capacitance (C of charge indicating device21、C22、C23) non-power-frequency current i0, alien frequencies voltage uoWith
And ω1It is known quantity, and C12≈C13≈C11、C22≈C23≈C21、C0=Ca//Cb//Cc(Ca、Cb、CcRespectively A phases, B phases and
The direct-to-ground capacitance of C phases), therefore, C can be calculated by formula (1)0。
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, can calculate separately out electric system per relatively capacitance, without having a power failure, safe is tested, is suitable for not
Earthed system capacitance current is tested.
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) and capacitance current computing module (5), one end electrical connection of the high frequency power module (2)
The power module (1), the other end are electrically connected the current output module (3) and the test module (4), the test
The other end of module (4) is electrically connected the capacitance current computing module (5).
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, the calibrating terminal m are held with a phases of switch cabinet electrified instruction device respectively, b phases are held and c phases are held and are electrically connected, described
Ground terminal o is electrically connected with the ground terminal of switch cabinet electrified instruction device.
3. the apparatus according to claim 1, which is characterized in that described device further includes display module (6), the display mould
Block (6) 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 calibrating terminal m of current output module (3) respectively with a phases of switch cabinet electrified instruction device
End, b phases hold and hold electrical connection, the ground terminal of the ground terminal o and switch cabinet electrified instruction device of current output module (3) with c phases
Electrical connection.
5. a kind of test method of capacitance current, which is characterized in that include the following steps：
The calibrating terminal m of capacitance current test device current output module is held with a phases of switch cabinet electrified instruction device respectively,
B phases are held holds electrical connection with c phases, and the ground terminal o of capacitance current test device current output module and switch cabinet electrified are indicated
The ground terminal of device is electrically connected；
The high frequency voltage module for controlling capacitance current test device exports preset non-power-frequency current signal；
Test module obtains current output module in non-power-frequency current i0Under alien frequencies voltage uo；
According to the non-power-frequency current signal i0And the non-power-frequency current i0Under alien frequencies voltage uo, neutral point is calculated and does not connect
The total ground capacitance C of ground 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,
ω1For the angular frequency of the non-power-frequency current signal of input.
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 system under test (SUT) phase voltage.
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| CN201810209567.8A CN108548982B (en) | 2018-03-14 | 2018-03-14 | Method, device and system for testing capacitance current |
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| CN201810209567.8A CN108548982B (en) | 2018-03-14 | 2018-03-14 | Method, device and system for testing capacitance current |
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Cited By (2)
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| CN110297124A (en) * | 2019-08-06 | 2019-10-01 | 南方电网科学研究院有限责任公司 | A kind of ungrounded formula voltage measuring apparatus and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109901019B (en) * | 2019-04-02 | 2020-07-03 | 云南电网有限责任公司电力科学研究院 | Method and device for measuring capacitance current of resonant grounding system |
| CN110297124A (en) * | 2019-08-06 | 2019-10-01 | 南方电网科学研究院有限责任公司 | A kind of ungrounded formula voltage measuring apparatus and method |
| CN110297124B (en) * | 2019-08-06 | 2022-04-12 | 南方电网科学研究院有限责任公司 | Non-grounded voltage measuring device and method |
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