CN207051393U - The capacitance measurement circuit of high-tension switch cabinet capacitance sensor - Google Patents
The capacitance measurement circuit of high-tension switch cabinet capacitance sensor Download PDFInfo
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- CN207051393U CN207051393U CN201720794045.XU CN201720794045U CN207051393U CN 207051393 U CN207051393 U CN 207051393U CN 201720794045 U CN201720794045 U CN 201720794045U CN 207051393 U CN207051393 U CN 207051393U
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Abstract
The utility model discloses a kind of capacitance measurement circuit of high-tension switch cabinet capacitance sensor.The capacitance measurement circuit includes：Convert of capacitor to voltage device, the convert of capacitor to voltage device includes being used for the signal input part for receiving exciting current signal caused by testing capacitance sensor, change-over circuit and the signal output part for output voltage signal, the voltage signal are related to the exciting current signal；Low pass filter, the low pass filter receive the voltage signal and export filtering signal；AD sampling units, the AD sampling units are connected with the low pass filter, for predetermined sample rate, the filtering signal being converted into data signal and processor, the processor receives the data signal, and measured capacitance value result corresponding to output.
Description
Technical field
It the utility model is related to measured capacitance value technical field, more particularly to a kind of electricity of high-tension switch cabinet capacitance sensor
Capacitance measuring circuit.
Background technology
Switch cubicle is the power equipment that quantity is the hugest in power distribution network, and the operation reliable and stable to power distribution network is played great
Effect.
With the continuous progress of electronic technology, requirement more and more higher of the equipment for intelligence degree.At present, switch cubicle
On-line monitoring technique develops rapidly, can monitor the various parameters on power network at any time and change and then be transferred to power supply administration backstage, fortune
Dimension personnel can formulate rational maintenance solution according to these parameters.
Capacitance sensor is a kind of important sensor in high-tension switch cabinet, is relatively widely used in switch cubicle at present
Powered display effect measures line voltage for capacitance partial pressure method.Therefore, to accurately and conveniently indicate network live feelings
Condition and line voltage index, just must be premised on the capacitance for the capacitance sensor that accurate measurement acquisition uses.
The method being commonly used is that capacitance is carried out using devices such as electric bridges when being dispatched from the factory by capacitance sensor producer
Measurement.But because the parameter of capacitance sensor can change with the change such as the temperature of environment, humidity, so causing accordingly
Error, measurement result inaccuracy also occurs in powered instruction situation and voltage measurement situation.
Therefore, prior art is also to be developed.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide high-tension switch cabinet capacitance sensing
The capacitance measurement circuit of device, it is intended to solve in the prior art capacitance value can not on-line measurement, renewal, influence to count
According to measurement result the problem of.
In order to achieve the above object, the utility model takes following technical scheme：
A kind of capacitance measurement circuit of high-tension switch cabinet capacitance sensor, wherein, including：
Capacitance to Voltage Converter, the Capacitance to Voltage Converter include being used to receive caused by testing capacitance sensor swashing
Encourage the signal input part of current signal, change-over circuit and the signal output part for output voltage signal, the voltage signal
It is related to the exciting current signal；
Low pass filter, the low pass filter receive the voltage signal and export filtering signal；
AD sampling units, the AD sampling units are connected with the low pass filter, for predetermined sample rate, by institute
State filtering signal and be converted to data signal；
Processor, the processor receive the data signal, and measured capacitance value result corresponding to output.
Described capacitance measurement circuit, wherein, the Capacitance to Voltage Converter includes：Feedback resistance, feedback capacity with
And operational amplifier；
The feedback resistance is connected in parallel with the feedback capacity, and the feedback capacity is connected with the operational amplifier,
The output end of the operational amplifier forms the signal output part.
Described capacitance measurement circuit, wherein, the processor is STM32 processors；Built in the AD sampling units
In the STM32 processors.
Described capacitance measurement circuit, wherein, the low pass filter is by operational amplifier and resistance-capacitance network
The active low-pass filter of composition.
Beneficial effect：Capacitance measurement circuit provided by the utility model, can using line voltage as ac-excited source
With the expense needed for economization driving source.In addition, the accurate online of capacitance sensor capacitance in high-tension switch cabinet can be realized accordingly
Measurement, solid foundation is provided for the accurate measurement of other measurement data, and can be carried out online, is monitored, is not allowed at any time
It is also easy to produce error.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the capacitance measurement circuit of the utility model specific embodiment.
Embodiment
The utility model provides a kind of capacitance measurement circuit.To make the purpose of this utility model, technical scheme and effect
Clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should be appreciated that this place is retouched
The specific embodiment stated only to explain the utility model, is not used to limit the utility model.
Fig. 1 is a kind of measured capacitance value electricity for high-tension switch cabinet capacitance sensor that the utility model specific embodiment provides
Road.As shown in figure 1, the measuring circuit includes：Capacitance to Voltage Converter 100, low pass filter 200, AD sampling units 300
And processor 400.
Wherein, the Capacitance to Voltage Converter 100 includes being used to receive exciting current letter caused by testing capacitance sensor
Number signal input part 110, change-over circuit 120 and the signal output part 130 for output voltage signal, the voltage signal
It is related to the exciting current signal.Voltage signal after output is received by the low pass filter, is handled after filtering, is removed
After higher hamonic wave, filtering signal is exported.
The AD sampling units 300 are connected with the low pass filter 200, for predetermined sample rate, by the filter
Ripple signal is converted to data signal.After the processor 400 receives the data signal, by default algorithm, calculate pair
Exported after the measured capacitance value result answered, so as to complete the measurement of capacitance.
In this embodiment, exciting current is produced by capacitance sensor using power network ac high-voltage as driving source first.So
Exciting current is changed through Capacitance to Voltage Converter again afterwards, low pass filter filters and amplifies.Finally, carried out by processing unit
After Data Analysis Services, capacitance sensor capacitance in switch cubicle is measured in real time.
In some embodiments, it may be preferred to using coaxial cable connect the capacitance sensor to be measured and electric capacity-
Electric pressure converter, the interference of equivalent capacity caused by reducing plain conductor.In actual measurement process, capacitance sensing to be measured
Device is directly connected with switch cubicle inner high voltage busbar, therefore the line voltage just convenient excitation as the measurement of capacitance sensor capacitance
Source, it can start to measure by switching control, driving source is by that will produce exciting current after capacitance sensor, then excitation is electric
Stream flows to the Capacitance to Voltage Converter 100.
Specifically, as shown in figure 1, the Capacitance to Voltage Converter 100 can specifically include：Feedback resistance R1, feedback electricity
Hold C1 and operational amplifier U1A.Ac amplifier circuit is it constituted, there is Low ESR, the characteristics of load capacity is strong.The conversion
Device is easy to follow-up voltage sampling, can finally export the alternating voltage related to input stimulus current signal.
Wherein, the feedback resistance R1 and feedback capacity C1 is connected in parallel, prevent from exporting it is excessive reach saturation state,
Play a part of protecting converter.The feedback capacity C1 is connected with the operational amplifier U1A, the operational amplifier U1A
Output end form the signal output part.The operational amplifier U1A preferably uses low input bias current high input impedance
Rail-to-rail exchange operational amplifier.
More specifically, as shown in figure 1, the low pass filter 200 can be by operational amplifier U1B and resistance capacitance net
The active low-pass filter of network composition.By setting the low pass filter, the higher hamonic wave on power network can be filtered out, avoids high order
Harmonic wave interferes to measurement result.
Alternatively, the processor 400 can be STM32 processors.In the processor of the model, 12 are built-in with
AD sampling units, realize the analog-to-digital conversion of voltage signal.
Capacitance measurement circuit with reference to shown in Fig. 1, following equation can be derived：
Wherein, Cx is capacitance sensor C to be detected capacitance, and Rf is the resistance value of the feedback resistance R1, and Cf is
The capacitance of the feedback capacity C1.
In summary, capacitance measurement circuit provided by the utility model can use power network ac high-voltage as excitation
Source, and exciting current signal is produced by capacitance sensor in switch cubicle, realize that electric current arrives with reference to capacitance-voltage signal adapter
The conversion of voltage, and then online measure capacitance sensor capacitance.Whole measurement process need not have a power failure, and can carry out online,
In real time, capacitance sensor capacitance is accurately measured.
It is understood that for those of ordinary skills, can according to the technical solution of the utility model and
The utility model design is subject to equivalent substitution or change, and all these changes or replacement should all belong to appended by the utility model
Scope of the claims.
Claims (4)
- A kind of 1. capacitance measurement circuit of high-tension switch cabinet capacitance sensor, it is characterised in that including：Capacitance to Voltage Converter, the Capacitance to Voltage Converter include being used to receive excitation electricity caused by testing capacitance sensor Flow the signal input part of signal, change-over circuit and the signal output part for output voltage signal, the voltage signal and institute State exciting current signal correlation；Low pass filter, the low pass filter receive the voltage signal and export filtering signal；AD sampling units, the AD sampling units are connected with the low pass filter, for predetermined sample rate, by the filter Ripple signal is converted to data signal；Processor, the processor receive the data signal, and measured capacitance value result corresponding to output.
- 2. capacitance measurement circuit according to claim 1, it is characterised in that the Capacitance to Voltage Converter includes：Instead Feed resistance, feedback capacity and operational amplifier；The feedback resistance is connected in parallel with the feedback capacity, and the feedback capacity is connected with the operational amplifier, described The output end of operational amplifier forms the signal output part.
- 3. capacitance measurement circuit according to claim 2, it is characterised in that the processor is STM32 processors；Institute AD sampling units are stated to be built in the STM32 processors.
- 4. capacitance measurement circuit according to claim 3, it is characterised in that the low pass filter is by operation amplifier The active low-pass filter of device and resistance-capacitance network composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720794045.XU CN207051393U (en) | 2017-07-03 | 2017-07-03 | The capacitance measurement circuit of high-tension switch cabinet capacitance sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720794045.XU CN207051393U (en) | 2017-07-03 | 2017-07-03 | The capacitance measurement circuit of high-tension switch cabinet capacitance sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207051393U true CN207051393U (en) | 2018-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720794045.XU Active CN207051393U (en) | 2017-07-03 | 2017-07-03 | The capacitance measurement circuit of high-tension switch cabinet capacitance sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342827A (en) * | 2018-11-22 | 2019-02-15 | 湖南恩智测控技术有限公司 | A kind of circuit and method exchanging charge and discharge electrical measurement capacitance by capacitor |
| CN113014244A (en) * | 2021-03-16 | 2021-06-22 | 国网河南省电力公司开封供电公司 | Ring main unit operation detection device |
-
2017
- 2017-07-03 CN CN201720794045.XU patent/CN207051393U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342827A (en) * | 2018-11-22 | 2019-02-15 | 湖南恩智测控技术有限公司 | A kind of circuit and method exchanging charge and discharge electrical measurement capacitance by capacitor |
| CN109342827B (en) * | 2018-11-22 | 2024-03-29 | 湖南恩智测控技术有限公司 | Circuit and method for measuring capacitance value through capacitance alternating current charge and discharge |
| CN113014244A (en) * | 2021-03-16 | 2021-06-22 | 国网河南省电力公司开封供电公司 | Ring main unit operation detection device |
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