CN110095701A - A kind of device and method thereof carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously - Google Patents
A kind of device and method thereof carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously Download PDFInfo
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- CN110095701A CN110095701A CN201910507142.XA CN201910507142A CN110095701A CN 110095701 A CN110095701 A CN 110095701A CN 201910507142 A CN201910507142 A CN 201910507142A CN 110095701 A CN110095701 A CN 110095701A
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The equipment that the present invention relates to a kind of to carry out high voltage capacitive monitoring by measuring voltage and current simultaneously, including.Capacitive apparatus capacitance is calculated by accurately measuring the structure of voltage and current phase difference using the voltage and current signals of measuring device simultaneously；Using the high-resolution adc circuit of superelevation sample rate, the precision of phase sample is improved；The phase of signal is judged using zero passage point methods.A kind of method that the application equipment is monitored is additionally provided, by software filtering method, interference of the high-frequency signal to zero crossing is eliminated, achievees the purpose that accurately to measure zero crossing.
Description
Technical field
It is specifically a kind of to carry out height by measuring voltage and current simultaneously the present invention relates to capacitive apparatus detection device field
The device and method thereof of pressure-volume monitoring.
Background technique
Existing power equipment is lacked since inside exists because insulating caused by manufacturing the factors such as bad, aging and external force destruction
It falls into, will cause insulation fault, seriously affect the normal operation of power grid.
For the generation for preventing such serious accident, currently used traditional method is periodically stopped after putting equipment in service
Electricity carries out preventive trial and maintenance, to detect the insulation defect inside equipment in time.But the examination of power failure preventive trial
It tests condition and differs larger with operating status, be unable to Accurate Diagnosis and go out the insulation status of transformer equipment under running conditions.
With the progress of test technique automatic, Electric Power Equipment Insulation on-Line Monitor Device starts to find broad application, such as
Chinese invention patent CN109212446A discloses a kind of transformer equipment insulation line monitoring device, including device by a set of high pressure
Generator, simulation generate the high pressure of field test, and there are also a set of high-class dielectric loss tests and metal oxide to keep away
The standard test instrument of thunder device testing current in resistance property, for comparing test with checklist.In addition a set of dielectric loss of system configuration and
Zinc oxide current in resistance property simulator, for simulating each dielectric loss and current in resistance property measurement within the scope of subject apparatus measures
Point.
But its essence still falls within analog voltage, and perhaps electric current is tested and single collection voltages or testing current
Method can not improve the precision of phase sample, it is also difficult to avoid interference of the high-frequency signal to zero crossing.
Summary of the invention
Pass through technical problem to be solved by the invention is to provide one kind while measuring voltage and current and carries out high voltage capacitive
The device and method thereof of monitoring, to solve defect existing in the prior art.
The technical scheme to solve the above technical problems is that
A kind of equipment carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously, including restricting the number conditioning circuit, institute
State the high voltage potential transformer and output high voltage capacitive that the high pressure on capacitive apparatus is reduced and exported by signal conditioning circuit connection
The leakage current transformer of the end shield leakage current of equipment, the signal conditioning circuit control mould by high speed, high resolution ADC and MCU
Block carries out signal transmission；
Further, the signal conditioning circuit includes sequentially connected low-pass filter, overvoltage protector, signal amplification
Device, will be in the sample range of input signal conditioning to high speed, high resolution ADC；
Further, the high speed, high resolution ADC, using 4MHz sample frequency, 24 bit resolutions, it can be achieved that ±
0.0045 ° of phase measurement accuracy；
Also provide it is a kind of by and meanwhile measure voltage and current carry out high voltage capacitive monitoring method, include the following steps:
1) by high voltage potential transformer, the high pressure on capacitive apparatus is reduced, sensing is output to signal conditioning circuit, leads to
Leakage current transformer is crossed, by the end shield leakage current inductive output of high voltage capacitive apparatus to signal conditioning circuit；
2) signal conditioning circuit will be in the sample range of input signal conditioning to ADC；
3) high speed, high resolution ADC sample to what signal conditioning circuit inputted using 4MHz sample frequency；And
Sampled signal is transmitted to MCU control module；
4) MCU control module carries out low-pass filtering to collected voltage and current data, eliminates and repeats zero crossing；
5) respective average value is calculated to voltage signal and current signal in MCU control module, then by average value with
The sine wave signal comparison of respective input signal, obtains the zero crossing t1 and t2 of voltage and current, and then obtain two signals
Then phase difference △ t obtains the capacitance and dielectric loss of high voltage capacitive apparatus according to phase difference calculating；
6) MCU control module decides whether to provide alarm signal according to device parameter according to calculated dielectric loss.
The beneficial effects of the present invention are: using the voltage and current signals of measuring device simultaneously, by accurately measuring voltage
With the structure of current and phase difference, capacitive apparatus capacitance is calculated；Using the high-resolution adc circuit of superelevation sample rate, phase is improved
The precision of position sampling；The phase of signal is judged using zero passage point methods.By software filtering method, high-frequency signal is eliminated to zero passage
The interference of point, achievees the purpose that accurately to measure zero crossing.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is monitoring method schematic illustration of the present invention；
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
As shown in Figure 1, a kind of equipment for carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously, including restricting the number tune
Manage circuit, signal conditioning circuit connection reduces the high pressure on capacitive apparatus and the high voltage potential transformer exported and output
The leakage current transformer of the end shield leakage current of high voltage capacitive apparatus, the signal conditioning circuit by high speed, high resolution ADC with
MCU control module carries out signal transmission；
More specifically, the signal conditioning circuit includes sequentially connected low-pass filter, overvoltage protector, signal amplification
Device, will be in the sample range of input signal conditioning to high speed, high resolution ADC；
More specifically, the high speed, high resolution ADC, using 4MHz sample frequency, 24 bit resolutions, it can be achieved that ±
0.0045 ° of phase measurement accuracy；
When it is implemented, the equipment is directed to capacitive apparatus, the voltage and leakage current of capacitive apparatus can be acquired, calculates voltage
With the method for the phase difference of leakage current, the capacitance and dielectric loss of capacitive apparatus are obtained, further analysis obtains capacitive apparatus
State of insulation.If there is decreasing insulating in capacitive apparatus, i.e., capable of emitting alarm signal.
The method that the present invention also provides a kind of to carry out high voltage capacitive monitoring by measuring voltage and current simultaneously, including it is as follows
Step:
1) by high voltage potential transformer, the high pressure on capacitive apparatus is reduced, sensing is output to signal conditioning circuit, leads to
Leakage current transformer is crossed, by the end shield leakage current inductive output of high voltage capacitive apparatus to signal conditioning circuit；
2) signal conditioning circuit will be in the sample range of input signal conditioning to ADC；
3) high speed, high resolution ADC sample to what signal conditioning circuit inputted using 4MHz sample frequency；And
Sampled signal is transmitted to MCU control module；
4) MCU control module carries out low-pass filtering to collected voltage and current data, eliminates and repeats zero crossing t3；
5) as shown in Fig. 2, respective average value is calculated to voltage signal and current signal in MCU control module, then lead to
The sine wave signal for crossing average value and respective input signal compares, and obtains the zero crossing t1 and t2 of voltage and current, and then obtain
The phase difference △ t of two signals, then obtains the capacitance and dielectric loss of high voltage capacitive apparatus according to phase difference calculating；
6) MCU control module decides whether to provide alarm signal according to device parameter according to calculated dielectric loss.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of equipment for carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously, it is characterised in that: including restricting the number tune
Manage circuit, signal conditioning circuit connection reduces the high pressure on capacitive apparatus and the high voltage potential transformer exported and output
The leakage current transformer of the end shield leakage current of high voltage capacitive apparatus, the signal conditioning circuit by high speed, high resolution ADC with
MCU control module carries out signal transmission.
2. a kind of equipment for carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously according to claim 1,
Be characterized in that: the signal conditioning circuit includes sequentially connected low-pass filter, overvoltage protector, signal amplifier, will be defeated
Enter in signal condition to the sample range of high speed, high resolution ADC.
3. a kind of equipment for carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously according to claim 2,
Be characterized in that: the high speed, high resolution ADC, using 4MHz sample frequency, 24 bit resolutions are, it can be achieved that ± 0.0045 ° of phase
Position measurement accuracy.
4. a kind of method for carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously, it is characterised in that: 1) pass through high pressure
Voltage transformer reduces the high pressure on capacitive apparatus, and sensing is output to signal conditioning circuit, will by leakage current transformer
The end shield leakage current inductive output of high voltage capacitive apparatus is to signal conditioning circuit；2) signal conditioning circuit arrives input signal conditioning
In the sample range of ADC；3) high speed, high resolution ADC is carried out using 4MHz sample frequency to what signal conditioning circuit inputted
Sampling；And sampled signal is transmitted to MCU control module；4) MCU control module carries out low collected voltage and current data
Pass filter is eliminated and repeats zero crossing t3；5) respective average value is calculated to voltage signal and current signal in MCU control module,
Then it is compared by average value and the sine wave signal of respective input signal, obtains the zero crossing t1 and t2 of voltage and current, into
And the phase difference △ t of two signals is obtained, the capacitance of high voltage capacitive apparatus is then obtained according to phase difference calculating and medium damages
Consumption；6) MCU control module decides whether to provide alarm signal according to device parameter according to calculated dielectric loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910507142.XA CN110095701A (en) | 2019-06-12 | 2019-06-12 | A kind of device and method thereof carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910507142.XA CN110095701A (en) | 2019-06-12 | 2019-06-12 | A kind of device and method thereof carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously |
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| Publication Number | Publication Date |
|---|---|
| CN110095701A true CN110095701A (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910507142.XA Pending CN110095701A (en) | 2019-06-12 | 2019-06-12 | A kind of device and method thereof carrying out high voltage capacitive monitoring by measuring voltage and current simultaneously |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112881802A (en) * | 2021-01-14 | 2021-06-01 | 天地（常州）自动化股份有限公司 | Feed state detection device, control device, and detection method |
-
2019
- 2019-06-12 CN CN201910507142.XA patent/CN110095701A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112881802A (en) * | 2021-01-14 | 2021-06-01 | 天地（常州）自动化股份有限公司 | Feed state detection device, control device, and detection method |
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