CN101916648A - Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof - Google Patents
Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof Download PDFInfo
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Abstract
The invention relates to a digital type linear alternating voltage transformer of multi-frequency range measurement and a measuring method thereof. The alternating voltage transformer is suitable for various high-voltage levels and has the characteristics of high-frequency signal collection, high linearity, digital type, high precision and the like. On the basis of an active digital type voltage transformer, an advanced and controllable high-speed signal collecting and treating technique and an optical fiber conduction technique are adopted to increase the high-frequency management function and realize the alternating voltage transformer of multi-frequency range control measurement under the condition of ensuring power-frequency voltage measurement. The alternating voltage transformer structurally comprises a linear voltage divider connected with a high-voltage conducting wire, wherein the output end of the linear voltage divider is connected with the input end of a high-speed data collecting module, and the high-speed data collecting module transforms the collected analog signals into high-frequency signals and power-frequency signals and then outputs the signals; and the output end of the high-speed data collecting module is connected with the input end of a photoelectric isolating and transmitting module, the output end of the photoelectric isolating ad transmitting module is respectively connected with a power-frequency output interface and the input end of a signal frequency-dividing module, and the output end of the signal frequency-dividing module is respectively connected with the input ends of a harmonic wave output interface and a high-frequency output interface.
Description
Technical field
The present invention relates to a kind of multi-frequency range measurement AC voltage transformer, relate in particular to a kind of digital type linear alternating voltage transformer and method of measurement thereof of multi-frequency range measurement.
Background technology
For decades voltage transformer adopts the electromagnetic type structure more, and the systematic survey purpose is mainly electric energy metrical and relaying protection, because the electromagnetic type structure can't realize the measurement of high-frequency signal.Development along with electrical network, to grasp system and equipment running status, the unusual trend that development takes place of prediction in time and analysis, the measurement of voltage high-frequency signal becomes more and more important, press for digital type linear alternating voltage transformer, realize measurement the operation of power networks multi-parameter with high speed acquisition performance.
Construction and development along with intelligent grid; power system communication and information system develop rapidly; various high-speed a/d conversion and numerical value acquisition technique are ripe more; the voltage transformer that will be used for electric power system metering and protection is expanded its function, realizes the electrical network quality of power supply and provides data to become possibility for the status monitoring and the diagnosis of substation equipment.
Summary of the invention
Purpose of the present invention is exactly at present can't be to the problem of operation of power networks multiband voltage measurement in order to solve, a kind of each voltage levels that is suitable for is provided, has the high-frequency signal collection, linearity height, digital, the digital type linear alternating voltage transformer and the method for measurement thereof of the multi-frequency range measurement with high speed acquisition performance of characteristics such as high accuracy.
For achieving the above object, the present invention adopts following technical scheme:
A kind of digital type linear alternating voltage transformer of multi-frequency range measurement, it comprises the linear potentiometer that is connected with high-voltage conducting wires, described linear potentiometer output is connected with the high-Speed Data-Acquisition Module input, and high-Speed Data-Acquisition Module is exported after the analog signal of gathering is converted into high-frequency signal and power frequency component; The output of high-Speed Data-Acquisition Module is connected with the input of photoelectricity isolated transmission module, photoelectricity isolated transmission module output is connected with the signal frequency split module input with the power frequency output interface respectively, and signal frequency split module output is connected with the input of harmonic wave output interface with the high frequency output interface respectively.
Described high-Speed Data-Acquisition Module mainly is made up of high-frequency signal acquisition module and power frequency component acquisition module; Wherein,
Described high-frequency signal acquisition module comprises frequency sweep and low-frequency wave circuit, its input is connected with the linear potentiometer output, its output is connected with the input of signal amplifier, the output of signal amplifier is connected with ultrahigh speed digital-to-analogue conversion A/D device input, ultrahigh speed digital-to-analogue conversion A/D device output is divided into two-way, after converging with the digital control two-way output that shakes the frequency device respectively, be connected with two low frequency digital filters, the output of two low frequency digital filters is connected with waveform register I input again; The output of waveform register I is connected with the optical-electrical converter input with the digital control frequency device input that shakes respectively, and the optical-electrical converter output then is connected with the input of photoelectricity isolated transmission module;
Described power frequency component acquisition module comprises digital to analog converter ADC, its input is connected with the linear potentiometer output, output is connected with the high frequency filter input, the high frequency filter output is connected with the high pass filter input, the high pass filter output is connected with the digital integrator input, the digital integrator output is connected with the input of waveform register II, the output of waveform register II is connected with the logic control circuit input, the logic control circuit output is connected with the optical-electrical converter input, and the optical-electrical converter output then is connected with the input of photoelectricity isolated transmission module;
The power taking supply module then is respectively high-frequency signal acquisition module, power frequency component acquisition module and logic controller power supply.
Described logic controller is a sequential control circuit.
Described linear potentiometer is capacitive divider or resistance divider.
Described photoelectricity isolated transmission module is for to be made of successively optical sender, optical fiber, optical receiver three parts; Wherein optical sender is made up of the luminous transmitter of LED type and modulation thereof, drive circuit, and the sampled digital electrical signal conversion is become optical data stream; Optical receiver is located at voltage divider device bottom or transformer station observing and controlling case on the spot.
Described signal frequency split module is 150Hz～600Hz intermediate frequency active band pass filter and 30kHz and above high-frequency band pass active filter, their inputs all are connected with the photoelectricity isolated transmission module, and output is connected with the high frequency output interface with the harmonic wave output interface respectively.
Described power frequency output interface mainly is made of SDP data processing module and Ethernet output interface; Wherein SDP data processing module output is connected with the Ethernet output interface, and input is connected with photoelectricity isolated transmission module output.
Described harmonic wave output interface mainly is connected in series successively by digital intermediate frequency signal amplifier, high frequency filter II, low-frequency filter I, follower I and constitutes, and exports by ethernet port; Described high frequency output interface mainly is made of high-frequency digital signal amplifier, low-frequency filter II and follower II, and follower II is by the ethernet port output signal, and follower II also is connected with data cache.
A kind of method of work with digital type linear alternating voltage transformer of high speed acquisition performance utilizes linear potentiometer to gather the current signal of high-voltage conducting wires; High-speed data acquistion system is carried out high frequency and power frequency component collection, analog to digital conversion to detected current signal; Wherein the high-frequency signal collection is at first the analog signal of gathering to be carried out frequency sweep and low frequency filtering, amplification, carries out the ultrahigh speed digital-to-analogue conversion again, and the processing of the useful signal in the special frequency channel being moved to base band is finished in FREQUENCY CONTROL and low frequency digital filtering; By FREQUENCY CONTROL, realize the sample frequency control of high-frequency signal, to finish signal search and frequency-selecting to the full range band; The power frequency component collection be used for to power frequency component carry out analog-to-digital conversion, high and low frequency filtering, digital integration, waveform is deposited and logic control is handled; After the digital signal packing after this two-way preliminary treatment, be sent to power frequency output interface and signal frequency split module respectively by the high speed fibre isolated transmission module, the output of finishing the power frequency digital quantity separates with high-frequency signal with harmonic wave, and, finish the output of harmonic wave and high-frequency digital amount respectively by harmonic wave output interface and high frequency output interface.
The present invention has in the digital type linear alternating voltage transformer of high speed acquisition performance, comprise the linear potentiometer that is connected with lead, linear potentiometer is connected successively with high-Speed Data-Acquisition Module, photoelectricity isolated transmission module, the photoelectricity isolated transmission module is connected with the signal frequency split module with the power frequency output interface, and the signal frequency split module is by harmonic wave output interface and high frequency output interface difference outputting measurement value.Its course of work is: the capacitor voltage divider (or resistance divider) that is installed on lead is exported to high-Speed Data-Acquisition Module with tested voltage by a rated transformation ratio signal; At first the power frequency component acquisition module is received the synchronized sampling order that logic controller sends, and starts sampling, finishes sampled value framing coding and temporary; The high-frequency signal acquisition module is accepted synchronized sampling instruction (coming to merge cells), gathers by the frequency sweep signal that notes abnormalities, and the digital control device that shakes frequently accepts to gather core frequency (coming to merge cells), finishes the effective collection and the digital information processing of high-frequency signal.Finish message transmission that power frequency and high-frequency digital information package are realized gathering through the high speed fibre isolated transmission module to being positioned at voltage divider device bottom or the transformer station merge cells of control survey cabinet on the spot through the photoelectricity isolated transmission module, the signal frequency split module is separated middle and high frequency word signal from the high speed acquisition message part; By power frequency, harmonic wave and high frequency output interface, realize processing and output to normal power-frequency voltage, mains by harmonics voltage and transient signal.
Linear potentiometer is sensed as voltage signal by a certain percentage with primary voltage.High-Speed Data-Acquisition Module is finished processing such as collection to power frequency, high-frequency signal, digital to analog conversion.The photoelectricity isolated transmission module is finished opto-electronic conversion, transmission, isolation features to digital signal.The power frequency output interface is with power frequency digital signal arrangement output.The signal frequency split module is finished high frequency transient and harmonic wave separation function in the high-frequency digital signal.The harmonic wave output interface is finished harmonic wave digital signal arrangement output.The high frequency output interface is finished high-frequency digital signal arrangement output.The high-frequency signal acquisition module is the part of high-Speed Data-Acquisition Module, finishes processing such as control collection to high-frequency signal, digital to analog conversion.The power frequency component acquisition module is the part of high-pressure side high-Speed Data-Acquisition Module, finishes processing such as collection to power frequency component, digital to analog conversion.Logic control circuit in the power frequency component acquisition module, finishes that synchronized sampling command recognition, current signal sampled value are read, the data sorting function.The power taking supply module is finished the function that power supply is provided for high-Speed Data-Acquisition Module.Optical-electrical converter is finished and is transferred digital signal to function that light signal or light signal transfer digital electric signal to.Analog to digital converter ADC realizes the digital-to-analogue conversion of signal.High frequency filter I, in the power frequency component acquisition module, the elimination high-frequency interferencing signal.High pass filter in the high-frequency signal acquisition module, only allows the high frequency band signal of gathering pass through.Digital integrator, the signal with the linear potentiometer induction is reduced to tested digital voltage signal.Waveform register I, in the power frequency component acquisition module, with the information temporary storage after handling, waiting for packs carries out opto-electronic conversion.Frequency sweep and low-frequency filter circuit in the high-frequency signal acquisition module, are responsible for finding high-frequency signal, and the elimination low frequency signal.Signal amplifier in the high-frequency signal acquisition module, carries out processing and amplifying to faint high-frequency signal.Ultrahigh speed digital-to-analogue conversion A/D device is realized the digital-to-analogue conversion of high-frequency signal.The digital control device frequently that shakes in the high-frequency signal acquisition module, by changing its concussion frequency, is realized the signal search of full range band and the control of mode of operation.The low frequency digital filter, in the high-frequency signal acquisition module, the elimination low frequency signal.Waveform register II, in the high-frequency signal acquisition module, with the high-frequency digital information temporary storage after handling, waiting for packs carries out opto-electronic conversion.Optical sender compiles signal for being adapted at the sign indicating number type of optical cable transmission; Carry out electricity/light conversion, convert the electrical signal to light signal and coupled into optical fibres.Optical fiber, transmitting optical signal is also realized the Signal Spacing function.Optical receiver, receiving optical signals realize comprising the function of light detection, amplification, signal processing, light/electricity conversion.The SDP data processing module in the power frequency output module, is finished power frequency component data preparation function.The Ethernet output interface is finished the function that information is sent to territory, transformer station station application layer.The digital intermediate frequency signal amplifier in the harmonic wave output module, is finished the amplification arrangement function to harmonic signal.High frequency filter II in the harmonic wave output module, finishes the High frequency filter function of harmonic signal.Low-frequency filter I in the harmonic wave output module, finishes the low frequency filtering function of harmonic signal.Follower I in the harmonic wave output module, plays the output buffering of harmonic signal and improves the output signal-to-noise ratio function.The high-frequency digital signal amplifier in the high frequency output module, is finished the amplification arrangement function to high-frequency signal.Low-frequency filter II in the high frequency output module, finishes the low frequency filtering function to high-frequency signal.Follower II in the high frequency output module, plays the output buffering of high-frequency signal and improves the output signal-to-noise ratio function.Data cache in the high frequency output module, is temporarily stored the carrying out of the high frequency output signal that data volume is bigger in the digital linear alternating current transducer.
The invention has the beneficial effects as follows: the digital type linear alternating voltage transformer with high speed acquisition performance of the present invention, be suitable for each voltage levels, have the high-frequency signal collection, linearity height, digital, advantages such as high accuracy.Isolate transmission, signal frequency split system and at least three digital quantities outputs by capacitor voltage divider (or resistance divider, resistance-capacitance type voltage divider), high-speed data acquisition and photoelectricity, finish measurement normal power-frequency voltage, mains by harmonics and transient signal.Realization is to providing the signal except that the electric energy metrical that possesses conventional electrical formula voltage transformer, relaying protection; also possesses the measurement of mains by harmonics voltage and transient signal; to grasp system and equipment running status; the unusual trend that development takes place of prediction in time and analysis realizes significant to the real-time measurement of operation of power networks multi-parameter.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the high-Speed Data-Acquisition Module structural representation;
Fig. 3 is a photoelectricity isolated transmission module structural representation;
Fig. 4 is a power frequency component output interface structural representation;
Fig. 5 is a harmonic data output interface structural representation;
Fig. 6 is a high-frequency data output interface structural representation.
Wherein, 1. linear potentiometer, 2. high-Speed Data-Acquisition Module, 3, the photoelectricity isolated transmission module, 4, the power frequency output interface, 5, the signal frequency split module, 6, the harmonic wave output interface, 7, the high frequency output interface, 8, the high-frequency signal acquisition module, 9, the power frequency component acquisition module, 10, logic control circuit, 11, the power taking supply module, 12, optical-electrical converter, 13, analog to digital converter ADC, 14, high frequency filter I, 15, high pass filter, 16, digital integrator, 17, waveform register I, 18, frequency sweep and low-frequency filter circuit, 19, signal amplifier, 20, ultrahigh speed digital-to-analogue conversion A/D device, 21, the digital control device frequently that shakes, 22, the low frequency digital filter, 23, waveform register II, 24, optical sender, 25, optical fiber, 26, optical receiver, 27, the SDP data processing module, 28, the Ethernet output interface, 29, the digital intermediate frequency signal amplifier, 30, high frequency filter II, 31, low-frequency filter I, 32, follower I, 33, the high-frequency digital signal amplifier, 34, low-frequency filter II, 35, follower II, 36, data cache.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, it comprises the linear potentiometer 1 that is connected with high-voltage conducting wires, and described linear potentiometer 1 output is connected with high-Speed Data-Acquisition Module 2 inputs, and high-Speed Data-Acquisition Module 2 is exported after the analog signal of gathering is converted into high-frequency signal and power frequency component; The output of high-Speed Data-Acquisition Module 2 is connected with the input of photoelectricity isolated transmission module 3, photoelectricity isolated transmission module 3 outputs are connected with signal frequency split module 5 inputs with power frequency output interface 4 respectively, and signal frequency split module 5 outputs are connected with the input of harmonic wave output interface 6 with high frequency output interface 7 respectively.Described linear potentiometer 1 is capacitive divider or resistance divider.Signal frequency split module 5 is for being that the high speed acquisition partial information of digital quantity is respectively simultaneously by 150Hz～600Hz intermediate frequency active band pass filter and 30kHz and above high-frequency band pass active filter with light-to-current inversion, output outputs to harmonic wave output interface 6 and high frequency output interface 7 respectively, and finishing middle and high frequency word signal is the function of separating the high speed acquisition part of digital quantity from light-to-current inversion.
Among Fig. 2, described high-Speed Data-Acquisition Module 2 mainly is made up of high-frequency signal acquisition module 8 and power frequency component acquisition module 9; Wherein,
Described high-frequency signal acquisition module 8 comprises frequency sweep and low-frequency wave circuit 18, its input is connected with linear potentiometer 1 output, its output is connected with the input of signal amplifier 19, the output of signal amplifier 19 is connected with ultrahigh speed digital-to-analogue conversion A/D device 20 inputs, ultrahigh speed digital-to-analogue conversion A/D device 20 outputs are divided into two-way, after converging with the digital control two-way output that shakes frequency device 21 respectively, be connected with two low frequency digital filters 22, the output of two low frequency digital filters 22 is connected with waveform register II23 input again; The output of waveform register II23 is connected with optical-electrical converter 12 inputs with digital control frequency device 21 inputs that shake respectively, and optical-electrical converter 12 outputs then are connected with the input of photoelectricity isolated transmission module 3;
Described power frequency component acquisition module 9 comprises digital to analog converter ADC13, its input is connected with linear potentiometer 1 output, output is connected with high frequency filter I14 input, high frequency filter I14 output is connected with high pass filter 15 inputs, high pass filter 15 outputs are connected with digital integrator 16 inputs, digital integrator 16 outputs are connected with the input of waveform register I17, the output of waveform register I17 is connected with logic control circuit 10 inputs, the output of logic control circuit 10 is connected with optical-electrical converter 12 inputs, and optical-electrical converter 12 outputs then are connected with the input of photoelectricity isolated transmission module 3;
11 of power taking supply modules are respectively high-frequency signal acquisition module 8, power frequency component acquisition module 9 and logic control circuit 10 power supplies.Logic control circuit 10 is a sequential control circuit.
Among Fig. 3, described photoelectricity isolated transmission module 3 is for to be made of successively optical sender 24, optical fiber 25, optical receiver 26 3 parts; Wherein optical sender 24 is made up of the luminous transmitter of LED type and modulation thereof, drive circuit, and the sampled digital electrical signal conversion is become optical data stream; Optical receiver 26 is located at voltage divider device bottom or transformer station observing and controlling case on the spot.
Among Fig. 4, power frequency output interface 4 is for mainly being made of SDP data processing module 27 and Ethernet output interface 28; SDP data processing module 27 outputs are connected with Ethernet output interface 28, and input is connected with photoelectricity isolated transmission module 3 outputs.27 of SDP data processing modules mainly are composed in series by data cache module, digital filtering module, root mean square and phase angle computing module and phase compensation block.
Among Fig. 5, described harmonic wave output interface 6 mainly is connected in series successively by digital intermediate frequency signal amplifier 29, high frequency filter II30, low-frequency filter I31, follower I32 and constitutes, and exports by ethernet port.
Among Fig. 6, described high frequency output interface 7 mainly is made of high-frequency digital signal amplifier 33, low-frequency filter II34 and follower II35, and follower II35 is by the ethernet port output signal, and follower II35 also is connected with data cache 36.
The present invention utilizes linear potentiometer to gather the current signal of high-voltage conducting wires; High-speed data acquistion system is carried out high frequency and power frequency component collection, analog to digital conversion to detected current signal; Wherein the high-frequency signal collection is at first the analog signal of gathering to be carried out frequency sweep and low frequency filtering, amplification, carries out the ultrahigh speed digital-to-analogue conversion again, and the processing of the useful signal in the special frequency channel being moved to base band is finished in FREQUENCY CONTROL and low frequency digital filtering; By FREQUENCY CONTROL, realize the sample frequency control of high-frequency signal, to finish signal search and frequency-selecting to the full range band; The power frequency component collection be used for to power frequency component carry out analog-to-digital conversion, high and low frequency filtering, digital integration, waveform is deposited and logic control is handled; After the digital signal packing after this two-way preliminary treatment, be sent to power frequency output interface and signal frequency split module respectively by the high speed fibre isolated transmission module, the output of finishing the power frequency digital quantity separates with high-frequency signal with harmonic wave, and, finish the output of harmonic wave and high-frequency digital amount respectively by harmonic wave output interface and high frequency output interface.
Claims (9)
1. the digital type linear alternating voltage transformer of a multi-frequency range measurement, it is characterized in that, it comprises the linear potentiometer that is connected with high-voltage conducting wires, described linear potentiometer output is connected with the high-Speed Data-Acquisition Module input, and high-Speed Data-Acquisition Module is exported after the analog signal of gathering is converted into high-frequency signal and power frequency component; The output of high-Speed Data-Acquisition Module is connected with the input of photoelectricity isolated transmission module, photoelectricity isolated transmission module output is connected with the signal frequency split module input with the power frequency output interface respectively, and signal frequency split module output is connected with the input of harmonic wave output interface with the high frequency output interface respectively.
2. the digital type linear alternating voltage transformer of multi-frequency range measurement as claimed in claim 1 is characterized in that, described high-Speed Data-Acquisition Module mainly is made up of high-frequency signal acquisition module and power frequency component acquisition module; Wherein,
Described high-frequency signal acquisition module comprises frequency sweep and low-frequency wave circuit, its input is connected with the linear potentiometer output, its output is connected with the input of signal amplifier, the output of signal amplifier is connected with ultrahigh speed digital-to-analogue conversion A/D device input, ultrahigh speed digital-to-analogue conversion A/D device output is divided into two-way, after converging with the digital control two-way output that shakes the frequency device respectively, be connected with two low frequency digital filters, the output of two low frequency digital filters is connected with waveform register I input again; The output of waveform register I is connected with the optical-electrical converter input with the digital control frequency device input that shakes respectively, and the optical-electrical converter output then is connected with the input of photoelectricity isolated transmission module;
Described power frequency component acquisition module comprises digital to analog converter ADC, its input is connected with the linear potentiometer output, output is connected with the high frequency filter input, the high frequency filter output is connected with the high pass filter input, the high pass filter output is connected with the digital integrator input, the digital integrator output is connected with the input of waveform register II, the output of waveform register II is connected with the logic control circuit input, the logic control circuit output is connected with the optical-electrical converter input, and the optical-electrical converter output then is connected with the input of photoelectricity isolated transmission module;
The power taking supply module then is respectively high-frequency signal acquisition module, power frequency component acquisition module and logic controller power supply.
3. the digital type linear alternating voltage transformer of multi-frequency range measurement as claimed in claim 2 is characterized in that, described logic controller is a sequential control circuit.
4. the digital type linear alternating voltage transformer of multi-frequency range measurement as claimed in claim 1 is characterized in that, described linear potentiometer is capacitive divider or resistance divider.
5. the digital type linear alternating voltage transformer of multi-frequency range measurement as claimed in claim 1 is characterized in that, described photoelectricity isolated transmission module is for to be made of successively optical sender, optical fiber, optical receiver three parts; Wherein optical sender is made up of the luminous transmitter of LED type and modulation thereof, drive circuit, and the sampled digital electrical signal conversion is become optical data stream; Optical receiver is located at voltage divider device bottom or transformer station observing and controlling case on the spot.
6. the digital type linear alternating voltage transformer of multi-frequency range measurement as claimed in claim 1, it is characterized in that, described signal frequency split module is 150Hz～600Hz intermediate frequency active band pass filter and 30kHz and above high-frequency band pass active filter, their inputs all are connected with the photoelectricity isolated transmission module, and output is connected with the high frequency output interface with the harmonic wave output interface respectively.
7. the digital type linear alternating voltage transformer of multi-frequency range measurement as claimed in claim 1 is characterized in that, described power frequency output interface mainly is made of SDP data processing module and Ethernet output interface; Wherein SDP data processing module output is connected with the Ethernet output interface, and input is connected with photoelectricity isolated transmission module output.
8. the digital type linear alternating voltage transformer of multi-frequency range measurement as claimed in claim 1, it is characterized in that, described harmonic wave output interface mainly is connected in series successively by digital intermediate frequency signal amplifier, high frequency filter II, low-frequency filter I, follower I and constitutes, and exports by ethernet port; Described high frequency output interface mainly is made of high-frequency digital signal amplifier, low-frequency filter II and follower II, and follower II is by the ethernet port output signal, and follower II also is connected with data cache.
9. the method for measurement of the digital type linear alternating voltage transformer of the described multi-frequency range measurement of claim 1 is characterized in that, utilizes linear potentiometer to gather the current signal of high-voltage conducting wires; High-speed data acquistion system is carried out high frequency and power frequency component collection, analog to digital conversion to detected current signal; Wherein the high-frequency signal collection is at first the analog signal of gathering to be carried out frequency sweep and low frequency filtering, amplification, carries out the ultrahigh speed digital-to-analogue conversion again, and the processing of the useful signal in the special frequency channel being moved to base band is finished in FREQUENCY CONTROL and low frequency digital filtering; By FREQUENCY CONTROL, realize the sample frequency control of high-frequency signal, to finish signal search and frequency-selecting to the full range band; The power frequency component collection be used for to power frequency component carry out analog-to-digital conversion, high and low frequency filtering, digital integration, waveform is deposited and logic control is handled; After the digital signal packing after this two-way preliminary treatment, be sent to power frequency output interface and signal frequency split module respectively by the high speed fibre isolated transmission module, the output of finishing the power frequency digital quantity separates with high-frequency signal with harmonic wave, and, finish the output of harmonic wave and high-frequency digital amount respectively by harmonic wave output interface and high frequency output interface.
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| CN102539868A (en) * | 2010-12-28 | 2012-07-04 | 苏州华电电气股份有限公司 | High-impedance variable-frequency voltage divider |
| CN102928641A (en) * | 2012-10-31 | 2013-02-13 | 南京江北自动化技术有限公司 | Electronic current transformer |
| WO2015070707A1 (en) * | 2013-11-13 | 2015-05-21 | 国家电网公司 | Method for acquiring universal data of intelligent substation |
| CN113740583A (en) * | 2021-10-09 | 2021-12-03 | 福州大学 | Non-contact alternating current voltage transformer based on light emitting diode |
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| CN113740583A (en) * | 2021-10-09 | 2021-12-03 | 福州大学 | Non-contact alternating current voltage transformer based on light emitting diode |
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