CN108548983A - 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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- CN108548983A CN108548983A CN201810210204.6A CN201810210204A CN108548983A CN 108548983 A CN108548983 A CN 108548983A CN 201810210204 A CN201810210204 A CN 201810210204A CN 108548983 A CN108548983 A CN 108548983A
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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 neutral point capacitive current testing methods, apparatus and system, method includes：The calibrating terminal 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, ground terminal o is electrically connected with the ground terminal of switch cabinet electrified instruction device, the current transformer of each phase is connected electrically between corresponding electrification indication sensor capacitance and switch cabinet electrified display device capacitance；Export non-power-frequency current signal；Obtain each corresponding alien frequencies voltage of the non-power-frequency current signal and non-power-frequency current；Calculate the direct-to-ground capacitance of each phase of isolated neutral system；According to the direct-to-ground capacitance of each phase, 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, capacitance current computing module and current transformer, the high frequency power module is electrically connected the electricity
Source module, the other end are electrically connected the current output module and the test module, and the test module is also electrically connected respectively
Connect the capacitance current computing module and the current transformer of each phase.
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 electrical connections switch cabinet electrified instruction with c phases
The ground terminal of device.
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
Phase end holds electrical connection, the ground terminal o of current output module to be electrically connected with the ground terminal of switch cabinet electrified instruction device with c phases,
The current transformer of each phase be connected electrically in corresponding electrification indication sensor capacitance and switch cabinet electrified display device capacitance it
Between.
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, by the current transformer of each phase be connected electrically in corresponding electrification indication sensor capacitance with
Between switch cabinet electrified display device capacitance；
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 each corresponding alien frequencies voltage ua、ub、ucAnd
Each corresponding non-power-frequency current ia、ib、ic；
According to a phase non-power-frequency currents ia, b phase non-power-frequency currents ib, c phase non-power-frequency currents ic, a phase alien frequencies voltages ua, b phases alien frequencies electricity
Press ub, c phase alien frequencies voltages ucAnd the capacitance of electrification indication sensor, pair of each phase of isolated neutral system is calculated
Ground capacitance；
According to the direct-to-ground capacitance of each phase, capacitive earth current is calculated.
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 calculation formula of the direct-to-ground capacitance of each phase is：
Wherein, Ca、Cb、CcRelatively relatively capacitance and C be relatively by capacitance, B by A respectively in isolated neutral system
Capacitance；C11、C12、C13The respectively corresponding A phases capacitance of switch cabinet electrified indication sensor, B phases capacitance and C phase capacitances；ω1For
Input the angular frequency of non-power-frequency current signal.
Preferably, the calculation formula of the capacitive earth current is：
Wherein, C21、C22、C23The respectively corresponding A phases capacitance of charge indicating device, B phases capacitance and C phase capacitances, ω2For
System under test (SUT) angular frequency；For system under test (SUT) phase voltage, IcFor capacitive earth current.
The application's has the beneficial effect that：
The present invention provides a kind of neutral point capacitive current testing methods, apparatus and system, device includes power module, high frequency electric source
Module, current output module, test module and capacitance current computing module and current transformer, the one of the high frequency power module
End is electrically connected the power module, and the other end is electrically connected the current output module and the test module, the test
Module is also electrically connected the capacitance current computing module and the current transformer of each phase.Wherein, power module is used for
For other module for power supply of the present apparatus；High frequency power module is for generating non-power-frequency current signal；Current output module is for exporting
Derided capacitors of the non-power-frequency current signal to charge indicating device；Measurement module is used for testing voltage and the circuit of current output module
Total current；Capacitance current computing module is used for calculating capacitance current according to preset formula, and current transformer is used for testing every phase
Non-power-frequency 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), by applying non-power-frequency current signal, measure charge indicating device capacitance (C21、C22、
C23) voltage and non-power-frequency current by switch cabinet electrified indication sensor, obtain the capacitance current of system under test (SUT) over the ground, have
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 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 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 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.
- 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
Capacitance current tests the electric hookup of system, A relatively capacitance measurement electrical equivalent loop diagram, B relatively capacitance measurement electricity
Gas equivalent circuit figure and C relatively capacitance measurement electrical equivalent loop diagram.By Fig. 1-4 as it can be seen that the test system includes neutral point
Isolated neutral system and corresponding capacitance current test device, isolated neutral system are the tested system of capacitance current test device
System.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 electrification indication sensor, band
Electric indication sensor is electrically connected with switch cabinet electrified instruction device.Switch cabinet electrified instruction device is commonly used in monitoring switchgear
No electrification is such as charged, 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. 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, current output module 3, test module 4
It is electrically connected the power module 1 with one end of capacitance current computing module 5 and current transformer 6, the high frequency power module 2,
The other end is electrically connected current output module 3 and test module 4, and the test module 4 is also electrically connected capacitance current meter
Calculate the current transformer 6 of module 5 and each phase.Wherein, power module 1 is power supply module, for other modules for the present apparatus
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 non-power-frequency current
Signal, such as frequency converter；The derided capacitors that current output module 3 is used to export non-power-frequency current signal to charge indicating device, electricity
It includes calibrating terminal m and ground terminal o to flow output module 3, for the alien frequencies of a certain frequency between 0.2k~1000kHz is electric
Stream 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 for testing
Voltage, circuit total current and the every phase non-power-frequency current of current output module 3, i.e. i under non-power-frequency current0Under each corresponding alien frequencies
Voltage ua、ub、ucAnd each corresponding non-power-frequency current ia、ib、ic, measurement module 4 can be with voltage, current detecting work(
The tester of energy；Capacitance current computing module 5 is used for, according to pre-set programs and formula, calculating capacitance current, and capacitance current calculates
Module 5 can be the microprocessor that MCU etc. has calculation processing function, and current transformer 6 is used for testing the alien frequencies electricity of every phase
Stream.
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. 6 show a kind of method flow diagram of neutral point capacitive current testing methods provided by the embodiments of the present application.As seen from Figure 6, 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, and the current transformer of each phase, which is connected electrically in corresponding electrification instruction, to be passed
Between sensor capacitance and switch cabinet electrified display device capacitance.
Step S200：The high frequency voltage module for controlling capacitance current test device exports preset non-power-frequency current signal i0,
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 is 0.2k
A certain frequency values between~1000kHz.
Step S300：Test module obtains non-power-frequency current signal i under non-power-frequency current0Under each corresponding alien frequencies
Voltage ua、ub、ucAnd each corresponding non-power-frequency current ia、ib、ic.Wherein, uaFor the corresponding alien frequencies voltages of a, ubFor b phases
Corresponding alien frequencies voltage, ucFor the corresponding alien frequencies voltages of c；iaFor the corresponding non-power-frequency currents of a, ibFor the corresponding alien frequencies electricity of b
Stream, icFor the corresponding non-power-frequency currents of c.
Step S400：According to a phase non-power-frequency currents ia, b phase non-power-frequency currents ib, c phase non-power-frequency currents ic, a phase alien frequencies voltages ua、b
Phase alien frequencies voltage ub, c phase alien frequencies voltages ucAnd the capacitance of electrification indication sensor, it is every that isolated neutral system is calculated
The direct-to-ground capacitance of one phase, specific calculation formula are：
Wherein, Ca、Cb、CcRelatively relatively capacitance and C be relatively by capacitance, B by A respectively in isolated neutral system
Capacitance；C11、C12、C13The respectively corresponding A phases capacitance of switch cabinet electrified indication sensor, B phases capacitance and C phase capacitances；ω1For
Input the angular frequency of non-power-frequency current signal.In above-mentioned formula 1, C11、C12、C13And ω1It is known quantity, therefore, according to fig. 2-
The 4 electrical equivalent loop diagrams provided, can obtain calculation formula 1, isolated neutral system can be calculated by formula 1
The direct-to-ground capacitance C of each phasea、Cb、Cc。
Step S500：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 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), capacitance current computing module (5) and current transformer (6), the high frequency power module
(2) one end is electrically connected the power module (1), and the other end is electrically connected the current output module (3) and the test
Module (4), the test module (4) is also electrically connected the capacitance current computing module (5) and the electric current of each phase is mutual
Sensor (6).
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
The ground terminal of ground terminal o electrical connection switch cabinet electrified instruction devices.
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 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, the current transformer (6) of each phase are connected electrically in corresponding electrification indication sensor capacitance and are shown with switch cabinet electrified
Between device capacitance.
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, and the current transformer of each phase is connected electrically in corresponding electrification indication sensor capacitance and switch
Between cabinet charged display device capacitance；
The high frequency voltage module for controlling capacitance current test device exports preset non-power-frequency current signal；
Test module obtains switch cabinet electrified display device in non-power-frequency current i0Under each corresponding alien frequencies voltage ua、ub、ucWith
And each corresponding non-power-frequency current ia、ib、ic；
According to a phase non-power-frequency currents ia, b phase non-power-frequency currents ib, c phase non-power-frequency currents ic, a phase alien frequencies voltages ua, b phase alien frequencies voltages ub、c
Phase alien frequencies voltage ucAnd the capacitance of electrification indication sensor, the electric over the ground of each phase of isolated neutral system is calculated
Hold；
According to the direct-to-ground capacitance of each phase, capacitive earth current is calculated.
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 calculation formula of the direct-to-ground capacitance of each phase is：
Wherein, Ca、Cb、CcA relatively capacitance, B relatively capacitance and C relatively capacitances respectively in isolated neutral system；
C11、C12、C13The respectively corresponding A phases capacitance of switch cabinet electrified indication sensor, B phases capacitance and C phase capacitances；ω1It is different to input
The angular frequency of frequency current signal.
8. the method according to the description of claim 7 is characterized in that the calculation formula of the capacitive earth current is：
Wherein, C21、C22、C23The respectively corresponding A phases capacitance of charge indicating device, B phases capacitance and C phase capacitances, ω2For tested system
System angular frequency；For system under test (SUT) phase voltage, IcFor capacitive earth current.
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| CN201810210204.6A CN108548983B (en) | 2018-03-14 | 2018-03-14 | Method, device and system for testing capacitance current |
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|---|---|---|---|
| CN201810210204.6A CN108548983B (en) | 2018-03-14 | 2018-03-14 | Method, device and system for testing capacitance current |
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| CN108548983B CN108548983B (en) | 2020-02-07 |
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Cited By (2)
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| 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 |
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