CN208043943U - A kind of capacitance current test device and system based on switch cabinet electrified instruction device - Google Patents
A kind of capacitance current test device and system based on switch cabinet electrified instruction device Download PDFInfo
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- CN208043943U CN208043943U CN201820347177.2U CN201820347177U CN208043943U CN 208043943 U CN208043943 U CN 208043943U CN 201820347177 U CN201820347177 U CN 201820347177U CN 208043943 U CN208043943 U CN 208043943U
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Abstract
The utility model provides a kind of capacitance current test device based on switch cabinet electrified instruction device, and method includes：The calibrating terminal of capacitance current test device voltage output module is held with a phases of switch cabinet electrified instruction device and is electrically connected, the ground terminal o of capacitance current test device voltage output module is electrically connected with the ground terminal of switch cabinet electrified instruction device；Export alien frequencies voltage signal；Test module obtains a phase currents of the alien frequencies voltage signal；The calibrating terminal of capacitance current test device voltage output module is held to hold with c phases with the b phases of switch cabinet electrified instruction device respectively and is electrically connected, obtains the b phase currents and c phase currents of the alien frequencies voltage signal respectively；Calculate the direct-to-ground capacitance of each phase；According to the direct-to-ground capacitance of each phase, capacitive earth current is calculated.The present apparatus 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 capacitance electricity based on switch cabinet electrified instruction device
Current test 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 capacitance test method has a direct method of measurement and the indirect method of measurement, and the direct method of measurement connects certain phase line is single-phase
Ground is directly measured；The indirect method of measurement mainly offsets the additional capacitance method of capacitance method, neutral point and alien frequencies method etc..However, straight
Connection measures capacitance current, and when experiment should directly contact with high pressure, and power grid and life security risk are larger.Current indirect measurement
Method is sent out if that there are part systems is smaller without neutral point or neutral excursion voltage for the additional capacitance method of neutral point in measurement process
Security risk when raw singlephase earth fault；Alien frequencies method is usually being surveyed in electromagnetic potential transformer open-triangular winding
Amount, 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, or even gives
System brings ferromagnetic resonance risk.Therefore, for capacitance current test, it is necessary to find not only safety but also easy test.
Utility model content
A kind of capacitance current test device based on switch cabinet electrified instruction device is provided in the utility model embodiment,
To solve the problems, such as that prior art operation is cumbersome, safety is poor.
The utility model provides a kind of capacitance current test device based on switch cabinet electrified instruction device, including power supply
Module, high frequency power module, voltage output module, test module and capacitance current computing module, the high frequency power module
One end is electrically connected the power module, and the other end is electrically connected voltage output module and test module, the test module
The other end is electrically connected capacitance current computing module.
Preferably, the voltage output module includes calibrating terminal m and ground terminal o, and the calibrating terminal m electrical connections are opened
The a phases of pass cabinet charge indicating device are held, b phases are held or c phases are held, the ground terminal o electrical connections switch cabinet electrified instruction device
Ground terminal.
Preferably, described device further includes display module, the other end of the display module and capacitance current computing module
Electrical connection.
Preferably, the high frequency power module is frequency converter.
The utility model additionally provides a kind of test system of capacitance current, including the device described in above-mentioned 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 E2
With C phases source E3Electrical connection, when test, the calibrating terminal m of voltage output module holds with a phases of switch cabinet electrified instruction device, b phases
One during end is held with c phases is electrically connected, the ground terminal o of voltage output module and the ground terminal electricity of switch cabinet electrified instruction device
Connection.
The application's has the beneficial effect that：
The utility model provides a kind of capacitance current test device based on switch cabinet electrified instruction device, and device includes
Power module, high frequency power module, voltage output module, test module and capacitance current computing module, the high frequency electric source mould
One end of block is electrically connected the power module, and the other end is electrically connected voltage output module and test module, the test mould
The other end of block is electrically connected 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 alien frequencies voltage signal；Voltage output module is for exporting alien frequencies voltage signal to charge indicating device
Derided capacitors；Measurement module is used for the voltage and circuit total current of test voltage output module；Capacitance current computing module is used for
Capacitance current is calculated according to preset formula.The utility model dexterously utilizes the switch cabinet electrified indication sensor generally used
Capacitance (C11、C12、C13) and charge indicating device capacitance (C21、C22、C23), the capacitance current of isolated neutral system is measured, is had
Test loop is simple, can calculate separately out electric system per relatively capacitance, without having a power failure, it is safe the advantages that, be suitable for
Isolated neutral system capacitance current is tested.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets the utility model
Embodiment, and for explaining the principles of the present invention together with specification.
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, for ordinary skill people
For member, without having to pay creative labor, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of capacitance current test device based on switch cabinet electrified instruction device provided by the embodiments of the present application
Electric hookup；
Fig. 2 is a kind of A provided by the embodiments of the present application relatively capacitance measurement electrical equivalent loop diagrams；
Fig. 3 is a kind of B provided by the embodiments of the present application relatively capacitance measurement electrical equivalent loop diagrams；
Fig. 4 is a kind of C provided by the embodiments of the present application relatively capacitance measurement electrical equivalent loop diagrams；
Fig. 5 is a kind of structural schematic diagram of capacitance current test device provided by the embodiments of the present application；
Fig. 6 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 utility model, below in conjunction with this reality
With the attached drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that
The described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.Based on the utility model
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example should all belong to the range of the utility model protection.
- 4 are please referred to Fig.1, shown is respectively provided by the embodiments of the present application a kind of based on switch cabinet electrified instruction device
Electric hookup, A relatively capacitance measurement electrical equivalent loop diagram, the B relatively capacitance measurement electricity of capacitance current test device
Gas equivalent circuit figure and C relatively capacitance measurement electrical equivalent loop diagram.By Fig. 1-4 as it can be seen that system under test (SUT) three phase mains
On be electrically connected electrification indication sensor, electrification indication sensor is electrically connected with switch cabinet electrified instruction device.Switchgear
Whether charge indicating device charges commonly used in monitoring switchgear, such as charges, then sends out alarm signal or electric blocking switch
Cabinet cabinet door cannot open cabinet door to prompt staff's switch cabinet electrified.Electrification indication sensor respectively include with it is each corresponding
Capacitance C11, capacitance C12With capacitance C13, switch cabinet electrified instruction device includes respectively including and each corresponding capacitance C21, electricity
Hold C22With capacitance C23, capacitance C11With capacitance C21Electrical connection, capacitance C12With capacitance C22Electrical connection, capacitance C13With capacitance C23It is electrically connected
It connects.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 or c phases are held, 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 alien frequencies voltage signal and three-phase current to system.
Referring to FIG. 5, showing a kind of structural schematic diagram of capacitance current test device provided by the embodiments of the present application.By
Fig. 5 is as it can be seen that the capacitance current test device includes power module 1, high frequency power module 2, voltage output module 3, test module
4 and capacitance current computing module 5, one end of the high frequency power module 2 is electrically connected the power module 1, other end electricity respectively
Connect voltage output module 3 and test module 4, the other end electrical connection capacitance current computing module 5 of the test module 4.Its
In, power module 1 is power supply module, and for other module for power supply for the present apparatus, power module 1, which can be accumulator etc., to be had
The element of function of supplying power；High frequency power module 2 is for generating alien frequencies voltage signal, such as frequency converter；Voltage output module 3 is used for
Derided capacitors of the alien frequencies voltage signal to charge indicating device are exported, voltage output module 3 includes calibrating terminal m and ground terminal
O, for the alien frequencies voltage signal of a certain frequency between 0.2k~1000kHz to be injected separately into A phase, B phase, C phase electrification instruction
Derided capacitors (the C of device21、C22、C23)；Measurement module 4 is used for the voltage and circuit total current of test voltage output module 3, i.e.,
Alien frequencies voltage uo, a phase currents ia, b phase currents ibWith c phase currents ic, measurement module 4 can be with voltage, current detection function
Tester；Capacitance current computing module 5 is used for, according to pre-set programs and formula, calculating capacitance current, and capacitance current calculates mould
Block 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 electricity based on switch cabinet electrified instruction device
Capacitance current test method.Referring to FIG. 6, showing a kind of method stream of neutral point capacitive current testing methods provided by the embodiments of the present application
Cheng Tu.As seen from Figure 6, this includes the following steps：
Step S100：The calibrating terminal m of capacitance current test device voltage output module and switch cabinet electrified instruction are filled
The a phases set hold electrical connection, and the ground terminal o of capacitance current test device voltage output module and switch cabinet electrified instruction are filled
The ground terminal electrical connection set.
Step S200：The high frequency voltage module for controlling capacitance current test device exports alien frequencies voltage signal, the alien frequencies
The frequency range of voltage signal is 0.2k~1000kHz, alien frequencies voltage uoVoltage range be 0.1V~50V.
Step S300：Test module obtains the alien frequencies voltage signal in alien frequencies voltage uoUnder a phase currents ia。
Step S400：The calibrating terminal m of capacitance current test device voltage output module is referred to switch cabinet electrified respectively
The b phases of showing device are held holds electrical connection, test module to obtain the alien frequencies voltage signal respectively in alien frequencies voltage u with c phasesoUnder b
Phase current ibWith c phase currents ic。
Step S500：According to a phase currents ia, b phase currents ib, c phase currents ic, switch cabinet electrified indication sensor capacitance
And the capacitance of charge indicating device, the direct-to-ground capacitance of each phase of isolated neutral system is calculated, it is specific to calculate public affairs
Formula is：
Wherein, Ca、Cb、CcRelatively relatively capacitance and C be relatively by capacitance, B by A respectively in isolated neutral system
Capacitance；C11、C12、C13A phases capacitance, B phases capacitance and C phase capacitances respectively in switch cabinet electrified indication sensor；C21、C22、 C23
A phases capacitance, B phases capacitance and C phase capacitances respectively in charge indicating device；ω1To input the angular frequency of alien frequencies voltage signal.On
It states in formula 1, C11、C12、C13C21、C22、C23And ω1It is known quantity, therefore, -4 electrical equivalents provided return according to fig. 2
Lu Tu can obtain calculation formula 1, and the direct-to-ground capacitance of each phase of isolated neutral system can be calculated by formula 1
Ca、Cb、Cc。
Step S600：According to the direct-to-ground capacitance of each phase, capacitive earth current I is calculatedc, specific to calculate public affairs
Formula is：
Wherein, ω2For system under test (SUT) angular frequency, usually definite value, 50Hz；For system under test (SUT) phase voltage, IcFor over the ground
Capacitance current.
Capacitance current test device provided by the utility model and the test method based on capacitance current test device, tool
There is the advantages that test loop is simple, can calculate separately out electric system per relatively capacitance, without having a power failure, safe, is applicable in
It is tested in isolated neutral system capacitance current.
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 specific embodiment of the present utility model, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of this utility model, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as the scope of protection of the utility model.
Claims (5)
1. a kind of capacitance current test device based on switch cabinet electrified instruction device, which is characterized in that including power module
(1), high frequency power module (2), voltage output module (3), test module (4) and capacitance current computing module (5), the high frequency
One end of power module (2) is electrically connected the power module (1), the other end be electrically connected the voltage output module (3) and
The other end of the test module (4), the test module (4) is electrically connected the capacitance current computing module (5).
2. the apparatus according to claim 1, which is characterized in that the voltage output module (3) includes calibrating terminal m and connects
Ground terminal o, a phases of the calibrating terminal m electrical connections switch cabinet electrified instruction device are held, b phases are held or c phases are held, the ground terminal
The ground terminal of sub- o electrical connections 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. the apparatus according to claim 1, which is characterized in that the high frequency power module (2) is frequency converter.
5. a kind of test system of capacitance current, which is characterized in that include the device as described in claim 1-4 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 voltage output module (3) holds with a phases of switch cabinet electrified instruction device, b
One during phase end is held with c phases is electrically connected, the ground terminal o of voltage output module (3) and connecing for switch cabinet electrified instruction device
Ground terminal is electrically connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820347177.2U CN208043943U (en) | 2018-03-14 | 2018-03-14 | A kind of capacitance current test device and system based on switch cabinet electrified instruction device |
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| CN201820347177.2U CN208043943U (en) | 2018-03-14 | 2018-03-14 | A kind of capacitance current test device and system based on switch cabinet electrified instruction device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333438A (en) * | 2018-03-14 | 2018-07-27 | 云南电网有限责任公司电力科学研究院 | A kind of test method of capacitance current, apparatus and system |
| CN110161384A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | The Partial discharge signal extraction element and method in instruction circuit are charged with LC parallel resonance |
-
2018
- 2018-03-14 CN CN201820347177.2U patent/CN208043943U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333438A (en) * | 2018-03-14 | 2018-07-27 | 云南电网有限责任公司电力科学研究院 | A kind of test method of capacitance current, apparatus and system |
| CN108333438B (en) * | 2018-03-14 | 2020-04-10 | 云南电网有限责任公司电力科学研究院 | Method, device and system for testing capacitance current |
| CN110161384A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | The Partial discharge signal extraction element and method in instruction circuit are charged with LC parallel resonance |
| CN110161384B (en) * | 2019-04-30 | 2021-01-26 | 云南电网有限责任公司电力科学研究院 | Partial discharge signal extraction method with LC parallel resonance charged indication loop |
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