CN108303595A - A kind of neutral point capacitive current testing methods based on alien frequencies phase current, apparatus and system - Google Patents
A kind of neutral point capacitive current testing methods based on alien frequencies phase current, apparatus and system Download PDFInfo
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- CN108303595A CN108303595A CN201810210211.6A CN201810210211A CN108303595A CN 108303595 A CN108303595 A CN 108303595A CN 201810210211 A CN201810210211 A CN 201810210211A CN 108303595 A CN108303595 A CN 108303595A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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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
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Abstract
The neutral point capacitive current testing methods that the present invention provides a kind of based on alien frequencies phase current, apparatus and system, method include：The calibrating terminal m of 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 its ground terminal, between resonant inductance is connected electrically in two leading-out terminals of current output module, the current transformer of each phase is connected electrically between electrification indication sensor capacitance and switch cabinet electrified display device capacitance；Output size is equal, the continuous one group of non-power-frequency current signal of frequency；Obtain the non-power-frequency current of maximum the alien frequencies voltage and each phase of each phase of non-power-frequency current signal lower switch cabinet charge indicating device of different frequency；Calculate the direct-to-ground capacitance and capacitive earth current of each phase of isolated neutral system.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.
Description
Technical field
This disclosure relates to technical field of power systems more particularly to a kind of capacitance current test side based on alien frequencies phase current
Method, 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 neutral point capacitive current testing methods based on alien frequencies phase current, apparatus and system are provided in the embodiment of the present invention,
To solve the problems, such as that prior art operation is cumbersome, safety is poor.
The present invention provides a kind of capacitance current test devices based on alien frequencies phase current, including power module, high-frequency electrical
Source module, current output module, test module, capacitance current computing module, resonant inductance and current transformer, the high-frequency electrical
One end of source module is electrically connected the power module, and the other end is electrically connected the input terminal of the current output module and described
Test module, the test module are also electrically connected the capacitance current computing module and the current transformer of each phase,
The resonant inductance is connected electrically between two leading-out terminals of the current output 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 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, and the capacitance current based on alien frequencies phase current tests system, including above-mentioned any one institute
The device stated further includes that three phase mains, electrification indication sensor and switch cabinet electrified instruction device, the switch cabinet electrified refer to
The a phases of showing device are held, b phases are held and c phases hold by the electrification indication sensor respectively with the A phases source in the three phase mains
E1, B phases source E2With C phases source E3Electrical connection, when test, the calibrating terminal m of current output module indicates to fill with switch cabinet electrified respectively
The a phases set are held, b phases hold and hold electrical connection, the ground terminal o of current output module and connecing for switch cabinet electrified instruction device with c phases
Ground terminal is electrically connected, and the resonant inductance is connected electrically between the current output module and switch cabinet electrified instruction device, each
The current transformer of phase is connected electrically between corresponding electrification indication sensor capacitance and switch cabinet electrified display device capacitance.
The present invention also provides a kind of neutral point capacitive current testing methods based on alien frequencies phase 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, will be every between resonant inductance is connected electrically in two leading-out terminals of current output module
The current transformer of one phase is connected electrically between corresponding electrification indication sensor capacitance and switch cabinet electrified display device capacitance；
The high frequency voltage module output size for controlling capacitance current test device is equal, the continuous one group of non-power-frequency current of frequency
Signal；
Test module is scanned the frequency of non-power-frequency current signal, and obtains and opened under the non-power-frequency current signal of different frequency
Close the maximum alien frequencies voltage u of each phase of cabinet charge indicating devicea、ub、ucAnd the non-power-frequency current i of each phasea、ib、ic；
It is each according to the maximum alien frequencies voltage of each phase of switch cabinet electrified instruction device and the charge indicating device
The direct-to-ground capacitance of each phase of isolated neutral system is calculated in the non-power-frequency current of phase；
According to the direct-to-ground capacitance of each phase of the isolated neutral system, capacitive earth current I is calculatedc。
Preferably, a certain current value of the non-power-frequency current signal between 0.1mA~100mA, the non-power-frequency current letter
Number frequency range be 0.2k~1000kHz.
Preferably, the calculation formula of the direct-to-ground capacitance of each phase of the isolated neutral system 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 phases capacitance, ω1For
Resonant inductance L and C21、C22、C23The angular frequency of non-power-frequency current signal, C are inputted when generating parallel resonance21、C22、C23Respectively band
The corresponding A phases capacitance of electric instruction device, B phases capacitance and C phase capacitances.
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 neutral point capacitive current testing methods that the present invention provides a kind of based on alien frequencies phase current, apparatus and system, device include
The present invention provides a kind of capacitance current test devices based on alien frequencies phase current, including power module, high frequency power module, electricity
Output module, test module and capacitance current computing module, resonant inductance and current transformer are flowed, the high frequency power module
One end is electrically connected the power module, and the other end is electrically connected the input terminal of the current output module and the test mould
Block, the test module is also electrically connected the capacitance current computing module and the current transformer of each phase, described humorous
The inductance that shakes is connected electrically between two leading-out terminals of the current output module.Wherein, power module is used for as the present apparatus
Other module for power supply；High frequency power module is for generating non-power-frequency current signal；Current output module is for exporting non-power-frequency current letter
Number give charge indicating device derided capacitors；Measurement module is used for testing the voltage and circuit total current of current output module；Electricity
Capacitance current computing module is used for calculating capacitance current according to preset formula, and resonant inductance is used for for point with charge indicating device
Voltage capacitance generates parallel resonance (C21、C22、C23), it is electrically connected between two leading-out terminals of current output module, Current Mutual Inductance
Device is used for testing the non-power-frequency current of every phase.The present invention dexterously utilizes the capacitance of the switch cabinet electrified indication sensor generally used
(C11、C12、C13) and charge indicating device capacitance (C21、C22、C23), and by applying to switchgear charge indicating device capacitance
Different frequency etc. amplitudes non-power-frequency current i0, so that the capacitance of charge indicating device is generated parallel resonance with resonant inductance, in the frequency
The non-power-frequency current i of rate0Under, it measures switch cabinet electrified instruction device and charges the alien frequencies voltage of indication sensor A, B, C phase and different
Frequency electric current finally obtains each relatively capacitance C of systema、Cb、Cc, to calculate capacitance current.The present invention tests system electricity
The method of capacitance current has the characteristics that test loop is simple, safe, measurement is convenient, is suitable for the measurement of capacitance current.
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 and a kind of system direct-to-ground capacitance measures electrical equivalent loop diagram.By Fig. 1-4 as it can be seen that
The test system includes isolated neutral system and corresponding capacitance current test device, and isolated neutral system is capacitance
The system under test (SUT) of current testing device.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 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
With capacitance current computing module 5, resonant inductance 6 and current transformer 7, the high frequency power module 2 one end electrical connection described in
Power module 1, the other end are electrically connected the input terminal and the test module 4 of the current output module 3, the test mould
Block 4 is also electrically connected the capacitance current computing module 5 and the current transformer 7 of each phase, 6 electricity of the resonant inductance
It is connected between two leading-out terminals of the current output module 3.Wherein, power module 1 is power supply module, for being this dress
Other module for power supply set, power module 1 can be the element with function of supplying power such as accumulator；High frequency power module 2 is used for
Generate non-power-frequency current signal, such as frequency converter；Current output module 3 is for exporting non-power-frequency current signal to charge indicating device
Derided capacitors, current output module 3 include calibrating terminal m and ground terminal o, are used for frequency between 0.2k~1000kHz
Non-power-frequency current signal be injected separately into the derided capacitors (C of A phase, B phase, C phase charge indicating device21、C22、C23)；Measurement module 4
Voltage, circuit total current for testing current output module 3, measurement module 4 can have voltage, current detection function
Tester；Capacitance current computing module 5 is used for, according to pre-set programs and formula, calculating capacitance current, capacitance current computing module 5
Can be the microprocessor that MCU etc. has calculation processing function, be electrically connected to current output module two of resonant inductance 6 are defeated
Go out between terminal, is used for for generating parallel resonance (C with the derided capacitors of charge indicating device21、C22、C23), current transformer
For testing the non-power-frequency current of every phase.
In addition, in the application other embodiment, which can also include display module 8, show mould
Block 8 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 8 can be the display for having display function.
Based on above-mentioned capacitance current test device, present invention also provides a kind of, and the capacitance current based on alien frequencies phase current is surveyed
Method for testing.Referring to FIG. 6, showing a kind of method flow diagram of neutral point capacitive current testing methods provided by the embodiments of the present application.By
Fig. 6 is as it can be seen that this includes the 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 resonant inductance is connected electrically in two leading-out terminals of current output module
Between, the current transformer of each phase is connected electrically in corresponding electrification indication sensor capacitance and switch cabinet electrified display device
Between capacitance.
Step S200：The high frequency voltage module output size for controlling capacitance current test device is equal, frequency continuous one
Group non-power-frequency current signal.A certain current value of the non-power-frequency current signal between 0.1mA~100mA, the non-power-frequency current letter
Number frequency range be 0.2k~1000kHz.
Non-power-frequency current i0Frequency can according to formula (formula 1) carry out substantially determine：
In formula 1, L is the inductance value of resonant inductance, and the non-power-frequency current signal of capacitance current test device output is f1It is attached
Close cline frequency.
Step S300：Test module is scanned the frequency of non-power-frequency current signal, and obtains the alien frequencies electricity of different frequency
Flow the maximum alien frequencies voltage u of each phase of signal lower switch cabinet charge indicating devicea、ub、ucAnd the non-power-frequency current i of each phasea、
ib、ic.Wherein, iaFor a phases non-power-frequency current, ibFor b phases non-power-frequency current, icFor c phases non-power-frequency current, uaFor a phase alien frequencies voltage, ubFor
B phase alien frequencies voltage, ucFor c phase alien frequencies voltages.
Step S400：It is indicated according to the maximum alien frequencies voltage of each phase of switch cabinet electrified instruction device and the electrification
The non-power-frequency current of each phase of device, is calculated the direct-to-ground capacitance of each phase of isolated neutral system.
According to fig. 2-4 provide electrical equivalent loop diagrams as it can be seen that switch cabinet electrified indication sensor capacitance (C11、C12、
C13) and charge indicating device capacitance (C21、C22、C23) it is known that then isolated neutral system can be calculated by formula 2 is every
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 phases capacitance, ω1For
Resonant inductance L and C21、C22、C23The angular frequency of non-power-frequency current signal, C are inputted when generating parallel resonance21、C22、C23Respectively band
The corresponding A phases capacitance of electric instruction device, B phases capacitance and C phase capacitances.
Step S500：According to the direct-to-ground capacitance of each phase of the isolated neutral system, direct-to-ground capacitance electricity is calculated
Flow Ic, 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 capacitance current test device based on alien frequencies phase current, which is characterized in that including power module (1), high-frequency electrical
Source module (2), current output module (3), test module (4), capacitance current computing module (5), resonant inductance (6) and electric current are mutual
One end of sensor (7), the high frequency power module (2) is electrically connected the power module (1), and the other end is electrically connected the electricity
The input terminal and the test module (4) of output module (3) are flowed, the test module (4) is also electrically connected the capacitance electricity
The current transformer (7) of stream calculation module (5) and each phase, the resonant inductance (6) are connected electrically in the electric current output mould
Between two leading-out terminals of block (3).
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 (8), the display mould
Block (8) is electrically connected with the other end of the capacitance current computing module (5).
4. a kind of capacitance current based on alien frequencies phase current tests system, which is characterized in that any one including such as claim 1-3
Device described in further includes three phase mains, electrification indication sensor and switch cabinet electrified instruction device, the switchgear band
The a phases of electric instruction device are held, b phases are held and c phases hold by the electrification indication sensor respectively with the A phases in the three phase mains
Source E1, B phases source E2With C phases source E3Electrical connection, when test, the calibrating terminal m of current output module (3) respectively with switch cabinet electrified
The a phases of instruction device are held, b phases hold and hold electrical connection, ground terminal o and the switch cabinet electrified of current output module (3) to indicate with c phases
The ground terminal of device is electrically connected, and the resonant inductance (6) is connected electrically in the current output module (3) and is indicated with switch cabinet electrified
Between device, the current transformer (7) of each phase is connected electrically in corresponding electrification indication sensor capacitance and is shown with switch cabinet electrified
Between showing device capacitance.
5. a kind of neutral point capacitive current testing methods based on alien frequencies phase 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, between resonant inductance is connected electrically in two leading-out terminals of current output module, by each phase
Current transformer be connected electrically between corresponding electrification indication sensor capacitance and switch cabinet electrified display device capacitance；
The high frequency voltage module output size for controlling capacitance current test device is equal, the continuous one group of non-power-frequency current letter of frequency
Number；
Test module is scanned the frequency of non-power-frequency current signal, and obtains the non-power-frequency current signal lower switch cabinet of different frequency
The maximum alien frequencies voltage u of each phase of charge indicating devicea、ub、ucAnd the non-power-frequency current i of each phasea、ib、ic；
According to the maximum alien frequencies voltage of each phase of switch cabinet electrified instruction device and each phase of the charge indicating device
The direct-to-ground capacitance of each phase of isolated neutral system is calculated in non-power-frequency current；
According to the direct-to-ground capacitance of each phase of the isolated neutral system, 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
The frequency range of a certain current value, the non-power-frequency current signal is 0.2k~1000kHz.
7. according to the method described in claim 5, it is characterized in that, the direct-to-ground capacitance of each phase of the isolated neutral system
Calculation formula be：
Wherein, Ca、Cb、CcRespectively in isolated neutral system A relatively capacitance, B relatively capacitance and C relatively capacitance,
C11、C12、C13The respectively corresponding A phases capacitance of switch cabinet electrified indication sensor, B phases capacitance and C phases capacitance, ω1For resonance electricity
Feel L and C21、C22、C23The angular frequency of non-power-frequency current signal, C are inputted when generating parallel resonance21、C22、C23Respectively electrification instruction
The corresponding A phases capacitance of device, B phases capacitance and C phase capacitances.
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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| CN201810210211.6A CN108303595B (en) | 2018-03-14 | 2018-03-14 | Capacitive current testing method, device and system based on pilot frequency phase current |
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| CN201810210211.6A CN108303595B (en) | 2018-03-14 | 2018-03-14 | Capacitive current testing method, device and system based on pilot frequency phase current |
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| Publication number | Priority date | Publication date | Assignee | Title |
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