CN208224473U - A kind of capacitance type equipment tests measuring device with electricity with respect to dielectric loss - Google Patents
A kind of capacitance type equipment tests measuring device with electricity with respect to dielectric loss Download PDFInfo
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- CN208224473U CN208224473U CN201820973241.8U CN201820973241U CN208224473U CN 208224473 U CN208224473 U CN 208224473U CN 201820973241 U CN201820973241 U CN 201820973241U CN 208224473 U CN208224473 U CN 208224473U
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Abstract
The utility model relates to substation fields to charge fortune inspection data interaction formula check analysis technical field, and in particular to a kind of capacitance type equipment tests measuring device with electricity with respect to dielectric loss, including reference signal generator interconnected and dielectric loss measurement device relatively；Reference signal generator includes sequentially connected reference clock, phase accumulator, waveform ROM, digital analog converter and low-pass filter；Opposite dielectric loss measurement device includes data acquisition module and phase-locking frequency multiplication circuit interconnected；Reference signal generator is used for outputting standard current and voltage signals, and opposite dielectric loss measurement device is used to calculate the phase difference of signal as standard scale, to obtain dielectric loss measurement value.The device is by changing input voltage and the Amplitude Ration for exporting electric current and phase difference come the capacitance and dielectric dissipation factor of artificial capacitor type equipment.Rationally with design, it operates conveniently, traces to the source conveniently, the main measurement function to dielectric loss tester may be implemented using the principle, carry out rationally efficient calibration.
Description
Technical field
The utility model belongs to substation field electrification fortune inspection data interaction formula check analysis technical field more particularly to one
Kind capacitance type equipment tests measuring device with electricity with respect to dielectric loss.
Background technique
In recent years, as voltage class of electric power system is higher and higher, power system capacity is increasing, used electrical equipment
More and more, the probability to break down increases.It is counted according to China's Operation of Electric Systems example, because of the aging of insulating material properties
Caused insulation fault accounts for about 50% or more of total failare rate, efficiently runs that more stringent requirements are proposed to power system stability.
For high-tension electricity equipment, equipment reliability of operation is directly influenced by apparatus insulated situation.Therefore, in order to
The insulation fault that accurately discovery and diagnosis high voltage electric equipment occur early, ensures that electrical equipment is safely and steadily run, has
Necessity detects physical parameter-dielectric loss of characterization insulating materials insulation performance.
Utility model content
The purpose of the utility model is to provide a kind of Amplitude Rations and phase difference by changing input voltage and exporting electric current
Come the capacitance and dielectric dissipation factor of artificial capacitor type equipment, realizes capacitance and dielectric loss to dielectric loss tester
Factor carries out the device of rationally efficient calibration.
In order to achieve the above purposes, the technical solution adopted by the utility model is:, and a kind of capacitance type equipment is tested with respect to dielectric loss
Measuring device with electricity, including reference signal generator interconnected and opposite dielectric loss measurement device；Reference signal generator packet
Include sequentially connected reference clock, phase accumulator, waveform ROM, digital analog converter and low-pass filter；Opposite dielectric loss measurement fills
It sets including data acquisition module interconnected and phase-locking frequency multiplication circuit；Reference signal generator is used for outputting standard Current Voltage
Signal, opposite dielectric loss measurement device is used to calculate the phase difference of signal as standard scale, to obtain dielectric loss measurement value.
In above-mentioned capacitance type equipment with respect in dielectric loss test measuring device with electricity, phase accumulator includes one N and adds
Musical instruments used in a Buddhist or Taoist mass and a N-bit register.
In above-mentioned capacitance type equipment with respect in dielectric loss test measuring device with electricity, data acquisition module includes measuring signal
Acquisition Circuit, signal conditioning module and A/D conversion module.
The utility model has the following beneficial effects: helping to improve the accuracy and consistency of dielectric loss measuring instrument transmission of quantity value；
It can meet simultaneously and reliability detection efficiently, in bulk is carried out with respect to dielectric loss to capacitance type equipment.Structure is simple, convenient for manipulating,
It is easy to accomplish, investment test can be completed with rapid configuration.Moreover, it is lower to site requirements, it adapts to by force, be applicable to logical over long distances
Letter detection, can easily recombination system, scalability be good.
Detailed description of the invention
Fig. 1 is that live detection instrument magnitude tracing figure is lost in the utility model one embodiment relative medium；
Fig. 2 is the utility model one embodiment with respect to dielectric loss Design Principle of Standard figure；
Fig. 3 is the loss of the utility model one embodiment relative medium and capacitance measuring tester structure chart；
Fig. 4 is the utility model one embodiment DDS functional structure chart；
Fig. 5 is the utility model one embodiment system entire block diagram.
Specific embodiment
The embodiments of the present invention is described in detail with reference to the accompanying drawing.
A kind of capacitance type equipment of the present embodiment is by changing input electricity with respect to the principle of dielectric loss test measuring device with electricity
The Amplitude Ration and phase difference of pressure and output electric current come the capacitance and dielectric dissipation factor of artificial capacitor type equipment.It is closed with design
Reason, operates conveniently, and traces to the source conveniently, the main measurement function (capacitance to dielectric loss tester may be implemented using the principle
And dielectric dissipation factor) carry out rationally efficient calibration.Specific technical solution is as follows:
A kind of capacitance type equipment tests measuring device with electricity with respect to dielectric loss, including reference signal generator and opposite dielectric loss are surveyed
Measure device.
Direct digital synthesis technique (DDS) technology be in March, 1971, Tierney, Rader and Gold propose with complete
Digital technology, the new frequency synthesis principle of one kind of waveform needed for directly synthesizing from phase concept, has many advantages, such as.Have
In consideration of it, reference signal generator is quasi- to be based on DDS technology, the development of high-accurate temperature measurement is completed, its working principle is that: it adopts
Digital frequency synthesis technique, mainly by reference clock, phase accumulator, waveform ROM, digital analog converter (DAC), low pass
Five part of filter (LPF) composition.DDS frequency synthesis principle are as follows: obtained according to time domain sampling theorem theory, existed to a bandwidth
Waveform in (0,2fc) range is sampled with the time interval of 1fc, sample be the signal staircase waveform, then should
Staircase waveform obtains required signal by ideal low-pass filter (Low Pass Filter, a LPF) smothing filtering
Waveform.
Since to capacitance type equipment, with respect to during dielectric loss live testing, there are stronger electromagnetic interferences to test electricity simultaneously
Source can cause measurement error larger with higher hamonic wave using XiLin bridge method as the traditional analog measurement method of representative, cannot be very
Meet measurement demand well.To avoid interference effect, reduce measurement error, digital measuring method is widely used.Cause
This, propose be based on harmonic analysis method, design based on digital is with respect to dielectric loss measurement device, it is contemplated that harmonic amplitude size directly affect because
Error caused by harmonic wave reduces influence of the harmonic wave to phase angle measurement by reduce the content of harmonic wave in signal.Opposite dielectric loss
Measuring device is designed in terms of hardware circuit and software processing method two, to guarantee capacitance type equipment with respect to dielectric loss standard
The accuracy of device.In order to realize the design requirement of opposite dielectric loss measurement device, meter is proposed using digital signal processor as system
The measuring system of control core completes entire measurement function using its digital processing and control function.Including signal acquisition circuit,
The data acquisition module of signal conditioning circuit and A/D converter circuit composition, phase-locking frequency multiplication circuit.In view of dielectric loss measurement category
In high voltage, micro-current, high-precision measurement, therefore, interference protection measure is essential.It selects to need to consider one when A/D device
A little factors, such as the operating voltage and reference voltage of the resolution ratio of A/D converter, A/D conversion rate and A/D converter.
When it is implemented, according to the regulation of dielectric loss factor in " GBT 1409-2006 ": dielectric loss angle is insulating materials as Jie
The complementary angle of phase difference between the voltage applied on the capacitor of matter and the electric current generated therefrom, and dielectric dissipation factor is
The tangent value of dielectric loss angle.It is found that dielectric loss factor and electric current, the voltage vector in measured signal are closely bound up, electric current, voltage are made
For two fundamental quantities of transmission of quantity value.Project team's proposed adoption electric current, two standards that voltage is opposite dielectric loss measurement are traced to the source parameter.
According to tracing to the source shown in Fig. 1, figure carries out magnitude tracing.
As shown in Fig. 2, capacitance type equipment is occurred with respect to the measurement criteria of dielectric loss test measuring device with electricity by standard signal
Device and opposite dielectric loss measurement device two parts form.The wherein electric current electricity as the signal generator of standard source for outputting standard
Signal is pressed, and calculates the phase difference of signal as the opposite dielectric loss measurement device of standard scale, obtains accurate dielectric loss measurement value.
As shown in figure 3, relative medium loss and capacitance measuring tester are for measuring capacitive voltage transformer, coupled capacitor
Device, bushing shell for transformer, current transformer casing and capacitive apparatus medium loss factor and capacitance equipment.
As shown in figure 4, being based on DDS technology, the development of high-accurate temperature measurement is completed, its working principle is that: use
Digital frequency synthesis technique, mainly by reference clock, phase accumulator, waveform ROM, digital analog converter (DAC), low-pass filtering
Five part of device (LPF) composition.
As shown in figure 5, proposing meter with digital signal processor is to be in order to realize opposite dielectric loss standard set-up design requirement
The measuring system of system control core utilizes its digital processing and control function to complete entire measurement function.Including signal acquisition electricity
The data acquisition module on road, signal conditioning circuit and A/D conversion circuit composition, phase-locking frequency multiplication circuit.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying specific embodiment of the present utility model above, those of ordinary skill in the art
It should be appreciated that these are merely examples, various deformation or modification can be made to these embodiments, it is practical without departing from this
Novel principle and essence.The scope of the utility model is only limited by the claims that follow.
Claims (3)
1. a kind of capacitance type equipment tests measuring device with electricity with respect to dielectric loss, characterized in that including standard signal interconnected
Generator and opposite dielectric loss measurement device；Reference signal generator includes sequentially connected reference clock, phase accumulator, waveform
ROM, digital analog converter and low-pass filter；Opposite dielectric loss measurement device includes data acquisition module interconnected and locking phase times
Frequency circuit；Reference signal generator is used for outputting standard current and voltage signals, and opposite dielectric loss measurement device is used for as standard scale
The phase difference of signal is calculated, to obtain dielectric loss measurement value.
2. capacitance type equipment as described in claim 1 tests measuring device with electricity with respect to dielectric loss, characterized in that phase accumulator
Including a N adders and a N-bit register.
3. capacitance type equipment as described in claim 1 tests measuring device with electricity with respect to dielectric loss, characterized in that data acquisition module
Block includes measuring signal Acquisition Circuit, signal conditioning module and A/D conversion module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820973241.8U CN208224473U (en) | 2018-06-21 | 2018-06-21 | A kind of capacitance type equipment tests measuring device with electricity with respect to dielectric loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820973241.8U CN208224473U (en) | 2018-06-21 | 2018-06-21 | A kind of capacitance type equipment tests measuring device with electricity with respect to dielectric loss |
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| Publication Number | Publication Date |
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| CN208224473U true CN208224473U (en) | 2018-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820973241.8U Expired - Fee Related CN208224473U (en) | 2018-06-21 | 2018-06-21 | A kind of capacitance type equipment tests measuring device with electricity with respect to dielectric loss |
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| Country | Link |
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| CN (1) | CN208224473U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907880A (en) * | 2019-11-27 | 2020-03-24 | 深圳天溯计量检测股份有限公司 | Calibration method of capacitance tester |
| CN111521965A (en) * | 2020-05-08 | 2020-08-11 | 广东电网有限责任公司电力科学研究院 | Transformer bushing dielectric loss detection device correction system and method |
-
2018
- 2018-06-21 CN CN201820973241.8U patent/CN208224473U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907880A (en) * | 2019-11-27 | 2020-03-24 | 深圳天溯计量检测股份有限公司 | Calibration method of capacitance tester |
| CN111521965A (en) * | 2020-05-08 | 2020-08-11 | 广东电网有限责任公司电力科学研究院 | Transformer bushing dielectric loss detection device correction system and method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181211 Termination date: 20190621 |
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| CF01 | Termination of patent right due to non-payment of annual fee |