CN201765263U - Digital multi-band measuring linear alternating-current voltage transformer - Google Patents
Digital multi-band measuring linear alternating-current voltage transformer Download PDFInfo
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- CN201765263U CN201765263U CN2010205012125U CN201020501212U CN201765263U CN 201765263 U CN201765263 U CN 201765263U CN 2010205012125 U CN2010205012125 U CN 2010205012125U CN 201020501212 U CN201020501212 U CN 201020501212U CN 201765263 U CN201765263 U CN 201765263U
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Abstract
The utility model relates to a digital multi-band measuring linear alternating-current voltage transformer, which is adaptable to various high-voltage levels and has the characteristics of high-frequency signal acquisition, high linearity, digitization, high accuracy and the like. The alternating-current voltage transformer adopts the method that on the basis of the digital active voltage transformer, the advanced controllable high-speed signal acquisition and processing and optical fiber transmission technologies are utilized, the high-frequency measurement function is added to the alternating-current voltage transformer on the premise of ensuring the measurement of power frequency voltage, and the multi-band measurement control is further realized. The alternating-current voltage transformer comprises a linear voltage divider connected with a high-voltage conductor, wherein the output terminal of the linear voltage divider is connected with the input terminal of a high-speed data acquisition module; the high-speed data acquisition module converts the collected analog signals into a high-frequency signal and a power frequency signal and then transmits the high-frequency signal and the power frequency signal; the output terminal of the high-speed data acquisition module is connected with the input terminal of a photoelectric isolation transmission module; the output terminal of the photoelectric isolation transmission module is connected with the input terminal of a power-frequency output interface and the input terminal of a signal frequency-division module respectively; and the output terminal of the signal frequency-division module is connected with the input terminal of a harmonic output interface and the input terminal of a high-frequency output interface respectively.
Description
Technical Field
The utility model relates to a multifrequency section measures alternating voltage transformer, especially relates to a linear alternating voltage transformer of digital formula of multifrequency section measurement.
Background
Voltage transformers have been used for decades and mostly adopt electromagnetic structures, the system measurement aims are mainly electric energy metering and relay protection, and due to the characteristics of the electromagnetic structures, the measurement of high-frequency signals cannot be realized. With the development of power grids, the measurement of voltage high-frequency signals is increasingly important for mastering the running states of systems and equipment and timely predicting and analyzing the development trend of abnormal occurrence, and a digital linear alternating-current voltage transformer with high-speed acquisition performance is urgently needed to realize the measurement of multiple running parameters of the power grids.
With the construction and development of smart power grids, the rapid development of power system communication and information systems, various high-speed A/D conversion and numerical acquisition technologies are more mature, the functions of a voltage transformer for metering and protecting the power system are expanded, the power quality of the power grid is realized, and data are provided for state monitoring and diagnosis of substation equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that can't operate multifrequency section voltage measurement to the electric wire netting at present, provide one kind and be suitable for each high-voltage grade, have high frequency signal collection, the linearity is high, digital, the high accuracy grade characteristics have the multifrequency section measuring digital linear alternating voltage transformer of high-speed collection performance.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a digital linear alternating current voltage transformer for multi-band measurement comprises a linear voltage divider connected with a high-voltage wire, wherein the output end of the linear voltage divider is connected with the input end of a high-speed data acquisition module, and the high-speed data acquisition module converts an acquired analog signal into a high-frequency signal and a power-frequency signal and then outputs the high-frequency signal and the power-frequency signal; the output end of the high-speed data acquisition module is connected with the input end of the photoelectric isolation transmission module, the output end of the photoelectric isolation transmission module is respectively connected with the power frequency output interface and the input end of the signal frequency division module, and the output end of the signal frequency division module is respectively connected with the input ends of the harmonic output interface and the high-frequency output interface.
The high-speed data acquisition module mainly comprises a high-frequency signal acquisition module and a power-frequency signal acquisition module; wherein,
the high-frequency signal acquisition module comprises a sweep frequency and low-frequency wave circuit, the input end of the sweep frequency and low-frequency wave circuit is connected with the output end of the linear voltage divider, the output end of the sweep frequency and low-frequency wave circuit is connected with the input end of the signal amplifier, the output end of the signal amplifier is connected with the input end of the ultra-high speed digital-to-analog conversion A/D device, the output end of the ultra-high speed digital-to-analog conversion A/D device is divided into two paths, the two paths of output ends are respectively converged with the two paths of output ends of the digital; the output end of the waveform register I is respectively connected with the input end of the digital control oscillator and the input end of the photoelectric converter, and the output end of the photoelectric converter is connected with the input end of the photoelectric isolation transmission module;
the power frequency signal acquisition module comprises a digital-to-analog converter (ADC), the input end of the ADC is connected with the output end of the linear voltage divider, the output end of the ADC is connected with the input end of the high-frequency filter, the output end of the high-frequency filter is connected with the input end of the high-pass filter, the output end of the high-pass filter is connected with the input end of the digital integrator, the output end of the digital integrator is connected with the input end of the waveform register II, the output end of the waveform register II is connected with the input end of the logic control circuit, the output end of the logic control circuit;
the power taking and supplying module respectively supplies power to the high-frequency signal acquisition module, the power frequency signal acquisition module and the logic controller.
The logic controller is a sequential control circuit.
The linear voltage divider is a capacitive voltage divider or a resistive voltage divider.
The photoelectric isolation transmission module is composed of an optical transmitter, an optical fiber and an optical receiver in sequence; the optical transmitter consists of an LED type luminous transmitter and a modulation and driving circuit thereof, and converts the sampling digital electric signal into an optical data stream; the optical receiver is arranged at the bottom of the voltage divider equipment or a local measurement and control box of a transformer substation.
The signal frequency division module comprises a 150 Hz-600 Hz intermediate frequency band-pass active filter and a high frequency band-pass active filter above 30kHz, the input ends of the two are connected with the photoelectric isolation transmission module, and the output ends of the two are respectively connected with the harmonic output interface and the high frequency output interface.
The power frequency output interface mainly comprises an SDP data processing module and an Ethernet output interface; the output end of the SDP data processing module is connected with the Ethernet output interface, and the input end of the SDP data processing module is connected with the output end of the photoelectric isolation transmission module.
The harmonic output interface is mainly formed by sequentially connecting an intermediate frequency digital signal amplifier, a high frequency filter II, a low frequency filter I and a follower I in series and outputs the signals through an Ethernet port; the high-frequency output interface mainly comprises a high-frequency digital signal amplifier, a low-frequency filter II and a follower II, wherein the follower II outputs signals through an Ethernet port, and the follower II is also connected with the high-speed data cache.
A working method of a digital linear alternating current voltage transformer with high-speed acquisition performance comprises the steps of acquiring a current signal of a high-voltage wire by using a linear voltage divider; the high-speed data acquisition system performs high-frequency and power-frequency signal acquisition and analog-to-digital conversion on the detected current signal; the high-frequency signal acquisition comprises the steps of firstly carrying out frequency sweep and low-frequency filtering and amplification on an acquired analog signal, then carrying out ultrahigh-speed digital-to-analog conversion, and carrying out frequency control and low-frequency digital filtering to finish the processing of moving a useful signal in a specific frequency band to a baseband; through frequency control, the sampling frequency control of high-frequency signals is realized so as to complete signal search and frequency selection of a full frequency band; the power frequency signal acquisition is used for carrying out analog-to-digital conversion, high-frequency and low-frequency filtering, digital integration, waveform registration and logic control processing on the power frequency signal; after the two paths of primarily processed digital signals are packed, the digital signals are respectively transmitted to a power frequency output interface and a signal frequency division module by a high-speed optical fiber isolation transmission module to finish the output of power frequency digital quantity and the separation of harmonic wave and high-frequency signals, and the output of the harmonic wave and high-frequency digital quantity is respectively finished through a harmonic wave output interface and a high-frequency output interface.
The utility model discloses among the linear alternating voltage transformer of digital type with high-speed collection performance, include the linear voltage divider who is connected with the wire, linear voltage divider connects gradually with high-speed data acquisition module, photoelectric isolation transmission module, and photoelectric isolation transmission module is connected with power frequency output interface and signal frequency division module, and signal frequency division module passes through harmonic output interface and high frequency output interface and exports the measured value respectively. The working process is as follows: a capacitive voltage divider (or a resistive voltage divider) arranged on the lead outputs a measured voltage to a high-speed data acquisition module according to a certain transformation ratio signal; firstly, a power frequency signal acquisition module receives a synchronous sampling command sent by a logic controller, starts sampling, completes framing coding of a sampling value and temporarily stores the sampling value; the high-frequency signal acquisition module receives a synchronous sampling instruction (from the merging unit), acquires abnormal signals found by frequency sweeping, and the digital control oscillator receives and acquires core frequency (from the merging unit), so that the effective acquisition of high-frequency signals and the digital information processing are completed. The packaging of power frequency and high-frequency digital information is completed through the photoelectric isolation transmission module, the acquired information is transmitted to a merging unit positioned at the bottom of a voltage divider device or a local control measuring cabinet of a transformer substation through the high-speed optical fiber isolation transmission module, and a signal frequency division module separates a medium-frequency digital signal and a high-frequency digital signal from a high-speed information acquisition part; and normal power frequency voltage, power grid harmonic voltage and transient signals are processed and output through power frequency, harmonic and high-frequency output interfaces.
The linear voltage divider is used for inducing the primary voltage into a voltage signal according to a certain proportion. And the high-speed data acquisition module is used for completing the acquisition of power frequency and high-frequency signals, digital-to-analog conversion and other processing. And the photoelectric isolation transmission module is used for completing photoelectric conversion, transmission and isolation functions of the digital signals. And the power frequency output interface is used for arranging and outputting the power frequency digital signals. And the signal frequency division module is used for completing the functions of high-frequency transient state and harmonic wave separation in the high-frequency digital signal. And the harmonic output interface finishes the arrangement and output of the harmonic digital signals. And the high-frequency output interface finishes high-frequency digital signal arrangement and output. The high-frequency signal acquisition module is a part of the high-speed data acquisition module and is used for completing the processing of high-frequency signal control acquisition, digital-to-analog conversion and the like. The power frequency signal acquisition module is a part of the high-voltage side high-speed data acquisition module and is used for completing the acquisition of power frequency signals, digital-to-analog conversion and other processing. And the logic control circuit completes the functions of synchronous sampling command identification, current signal sampling value reading and data sequencing in the power frequency signal acquisition module. And the power taking and supplying module is used for completing the function of supplying power to the high-speed data acquisition module. And the photoelectric converter is used for converting the digital signal into the optical signal or converting the optical signal into the digital electric signal. And the analog-to-digital converter ADC is used for realizing the digital-to-analog conversion of the signal. And the high-frequency filter I filters out high-frequency interference signals in the power frequency signal acquisition module. And the high-pass filter only allows the acquired high-frequency band signal to pass through in the high-frequency signal acquisition module. And the digital integrator restores the signal sensed by the linear voltage divider into a digital voltage signal to be measured. And the waveform register I temporarily stores the processed information in the power frequency signal acquisition module, and waits for packing to perform photoelectric conversion. The frequency sweeping and low frequency filter circuit is used for finding high frequency signals and filtering low frequency signals in the high frequency signal acquisition module. And the signal amplifier is used for amplifying the weak high-frequency signals in the high-frequency signal acquisition module. The ultra-high speed digital-to-analog conversion A/D device realizes digital-to-analog conversion of high-frequency signals. The digital control oscillator realizes signal search and working mode control of a full frequency band by changing oscillation frequency in a high-frequency signal acquisition module. And the low-frequency digital filter filters low-frequency signals in the high-frequency signal acquisition module. And the waveform register II temporarily stores the processed high-frequency digital information in the high-frequency signal acquisition module, and waits for packing to perform photoelectric conversion. An optical transmitter for encoding the signal into a code pattern suitable for transmission over an optical cable; electrical/optical conversion is performed to convert the electrical signal into an optical signal and coupled into an optical fiber. And the optical fiber transmits optical signals and realizes a signal isolation function. And the optical receiver receives the optical signal to realize the functions of optical detection, amplification, signal processing and optical/electrical conversion. And the SDP data processing module finishes the function of finishing the power frequency signal data in the power frequency output module. And the Ethernet output interface is used for finishing the function of sending the information to the substation domain application layer. And the intermediate frequency digital signal amplifier is used for finishing the amplification and arrangement functions of the harmonic signals in the harmonic output module. And the high-frequency filter II is used for finishing the high-frequency filtering function of the harmonic signal in the harmonic output module. And the low-frequency filter I completes the low-frequency filtering function of the harmonic signal in the harmonic output module. And the follower I plays the functions of output buffering of harmonic signals and improvement of output signal-to-noise ratio in the harmonic output module. And the high-frequency digital signal amplifier is used for finishing the amplification and arrangement functions of the high-frequency signals in the high-frequency output module. And the low-frequency filter II is used for finishing the low-frequency filtering function of the high-frequency signal in the high-frequency output module. And the follower II plays the functions of high-frequency signal output buffering and output signal-to-noise ratio improvement in the high-frequency output module. And the high-frequency output module temporarily stores the high-frequency output signal with large data quantity in the digital linear alternating current sensor.
The utility model has the advantages that: the utility model discloses a linear alternating voltage transformer of digital with high-speed collection performance is suitable for each high-voltage level, has high frequency signal collection, and the linearity is high, digital, advantages such as high accuracy. The measurement of normal power frequency voltage, power grid harmonic and transient signals is completed through a capacitive voltage divider (or a resistive voltage divider, a resistive voltage divider), high-speed data acquisition and photoelectric isolation transmission, a signal frequency division system and at least three digital quantity outputs. The method has the advantages that signals are provided for electric energy metering and relay protection of the conventional electronic voltage transformer, and the method also has the advantages of measuring harmonic voltage and transient signals of the power grid, and has important significance for mastering the running states of systems and equipment, predicting and analyzing the trend of abnormal occurrence and development in time and measuring multiple parameters of power grid operation in real time.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a high-speed data acquisition module;
FIG. 3 is a schematic structural diagram of a photoelectric isolation transmission module;
FIG. 4 is a schematic diagram of a power frequency signal output interface structure;
FIG. 5 is a schematic diagram of a harmonic data output interface;
fig. 6 is a schematic diagram of a high-frequency data output interface.
Wherein, 1, a linear voltage divider, 2, a high-speed data acquisition module, 3, a photoelectric isolation transmission module, 4, a power frequency output interface, 5, a signal frequency division module, 6, a harmonic output interface, 7, a high-frequency output interface, 8, a high-frequency signal acquisition module, 9, a power frequency signal acquisition module, 10, a logic control circuit, 11, a power-taking and power-supplying module, 12, a photoelectric converter, 13, an analog-to-digital converter ADC, 14, a high-frequency filter I, 15, a high-pass filter, 16, a digital integrator, 17, a waveform register I, 18, a sweep frequency and low-frequency filter circuit, 19, a signal amplifier, 20, a super-high-speed digital-to-analog conversion A/D device, 21, a digital control oscillator, 22, a low-frequency digital filter, 23, a waveform register II, 24, an optical transmitter, 25, an optical fiber, 26, an optical receiver, 27, an SDP data processing, 29. intermediate frequency digital signal amplifier, 30, high frequency filter II, 31, low frequency filter I, 32, follower I, 33, high frequency digital signal amplifier, 34, low frequency filter II, 35, follower II, 36, high speed data buffer.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
In fig. 1, the high-speed data acquisition device comprises a linear voltage divider 1 connected with a high-voltage wire, wherein the output end of the linear voltage divider 1 is connected with the input end of a high-speed data acquisition module 2, and the high-speed data acquisition module 2 converts an acquired analog signal into a high-frequency signal and a power-frequency signal and then outputs the high-frequency signal and the power-frequency signal; the output end of the high-speed data acquisition module 2 is connected with the input end of the photoelectric isolation transmission module 3, the output end of the photoelectric isolation transmission module 3 is respectively connected with the input ends of the power frequency output interface 4 and the signal frequency division module 5, and the output end of the signal frequency division module 5 is respectively connected with the input ends of the harmonic output interface 6 and the high-frequency output interface 7. The linear voltage divider 1 is a capacitive voltage divider or a resistive voltage divider. The signal frequency division module 5 is used for simultaneously passing the information of the high-speed acquisition part which is photoelectrically converted into digital quantity through the 150 Hz-600 Hz intermediate frequency band-pass active filter and the high-frequency band-pass active filter of 30kHz and above, and the output ends are respectively output to the harmonic output interface 6 and the high-frequency output interface 7, thereby completing the function of separating the intermediate-frequency and high-frequency digital signals from the high-speed acquisition part which is photoelectrically converted into digital quantity.
In fig. 2, the high-speed data acquisition module 2 mainly comprises a high-frequency signal acquisition module 8 and a power-frequency signal acquisition module 9; wherein,
the high-frequency signal acquisition module 8 comprises a sweep frequency and low-frequency wave circuit 18, the input end of the sweep frequency and low-frequency wave circuit is connected with the output end of the linear voltage divider 1, the output end of the sweep frequency and low-frequency wave circuit is connected with the input end of the signal amplifier 19, the output end of the signal amplifier 19 is connected with the input end of the ultra-high speed digital-to-analog converter A/D20, the output end of the ultra-high speed digital-to-analog converter A/D20 is divided into two paths, the two paths of output ends are respectively converged with the two paths of output ends of the digital control oscillator 21 and then connected with; the output end of the waveform register II23 is respectively connected with the input end of the digital control oscillator 21 and the input end of the photoelectric converter 12, and the output end of the photoelectric converter 12 is connected with the input end of the photoelectric isolation transmission module 3;
the power frequency signal acquisition module 9 comprises a digital-to-analog converter ADC13, the input end of the digital-to-analog converter ADC13 is connected with the output end of the linear voltage divider 1, the output end of the digital-to-analog converter ADC13 is connected with the input end of the high-frequency filter I14, the output end of the high-frequency filter I14 is connected with the input end of the high-pass filter 15, the output end of the high-pass filter 15 is connected with the input end of the digital integrator 16, the output end of the digital integrator 16 is connected with the input end of the waveform register I17, the output end of the waveform register I17 is connected with the input end of the logic control circuit;
the power taking and supplying module 11 respectively supplies power to the high-frequency signal acquisition module 8, the power frequency signal acquisition module 9 and the logic control circuit 10. The logic control circuit 10 is a timing control circuit.
In fig. 3, the optoelectronic isolation transmission module 3 is formed by sequentially an optical transmitter 24, an optical fiber 25, and an optical receiver 26; wherein the optical transmitter 24 is composed of an LED type light emitting transmitter and its modulation, driving circuit, and converts the sampled digital electrical signal into an optical data stream; the optical receiver 26 is located at the bottom of the voltage divider device or in the substation field box.
In fig. 4, the power frequency output interface 4 is mainly composed of an SDP data processing module 27 and an ethernet output interface 28; the output end of the SDP data processing module 27 is connected with the ethernet output interface 28, and the input end is connected with the output end of the optoelectronic isolation transmission module 3. The SDP data processing module 27 is mainly composed of a data caching module, a digital filtering module, a root mean square and phase angle calculating module and a phase compensating module which are connected in series.
In fig. 5, the harmonic output interface 6 is mainly formed by sequentially connecting an intermediate frequency digital signal amplifier 29, a high frequency filter II30, a low frequency filter I31, and a follower I32 in series, and outputs through an ethernet port.
In fig. 6, the high-frequency output interface 7 is mainly composed of a high-frequency digital signal amplifier 33, a low-frequency filter II34, and a follower II35, the follower II35 outputs signals through an ethernet port, and the follower II35 is also connected to the high-speed data buffer 36.
The utility model utilizes the linear voltage divider to collect the current signal of the high-voltage wire; the high-speed data acquisition system performs high-frequency and power-frequency signal acquisition and analog-to-digital conversion on the detected current signal; the high-frequency signal acquisition comprises the steps of firstly carrying out frequency sweep and low-frequency filtering and amplification on an acquired analog signal, then carrying out ultrahigh-speed digital-to-analog conversion, and carrying out frequency control and low-frequency digital filtering to finish the processing of moving a useful signal in a specific frequency band to a baseband; through frequency control, the sampling frequency control of high-frequency signals is realized so as to complete signal search and frequency selection of a full frequency band; the power frequency signal acquisition is used for carrying out analog-to-digital conversion, high-frequency and low-frequency filtering, digital integration, waveform registration and logic control processing on the power frequency signal; after the two paths of primarily processed digital signals are packed, the digital signals are respectively transmitted to a power frequency output interface and a signal frequency division module by a high-speed optical fiber isolation transmission module to finish the output of power frequency digital quantity and the separation of harmonic wave and high-frequency signals, and the output of the harmonic wave and high-frequency digital quantity is respectively finished through a harmonic wave output interface and a high-frequency output interface.
Claims (8)
1. A digital linear alternating current voltage transformer for multi-band measurement is characterized by comprising a linear voltage divider connected with a high-voltage wire, wherein the output end of the linear voltage divider is connected with the input end of a high-speed data acquisition module, and the high-speed data acquisition module converts an acquired analog signal into a high-frequency signal and a power-frequency signal and then outputs the high-frequency signal and the power-frequency signal; the output end of the high-speed data acquisition module is connected with the input end of the photoelectric isolation transmission module, the output end of the photoelectric isolation transmission module is respectively connected with the power frequency output interface and the input end of the signal frequency division module, and the output end of the signal frequency division module is respectively connected with the input ends of the harmonic output interface and the high-frequency output interface.
2. The digital linear ac voltage transformer for multiband measurement according to claim 1, wherein said high-speed data acquisition module is mainly composed of a high-frequency signal acquisition module and a power-frequency signal acquisition module; wherein,
the high-frequency signal acquisition module comprises a sweep frequency and low-frequency wave circuit, the input end of the sweep frequency and low-frequency wave circuit is connected with the output end of the linear voltage divider, the output end of the sweep frequency and low-frequency wave circuit is connected with the input end of the signal amplifier, the output end of the signal amplifier is connected with the input end of the ultra-high speed digital-to-analog conversion A/D device, the output end of the ultra-high speed digital-to-analog conversion A/D device is divided into two paths, the two paths of output ends are respectively converged with the two paths of output ends of the digital; the output end of the waveform register I is respectively connected with the input end of the digital control oscillator and the input end of the photoelectric converter, and the output end of the photoelectric converter is connected with the input end of the photoelectric isolation transmission module;
the power frequency signal acquisition module comprises a digital-to-analog converter (ADC), the input end of the ADC is connected with the output end of the linear voltage divider, the output end of the ADC is connected with the input end of the high-frequency filter, the output end of the high-frequency filter is connected with the input end of the high-pass filter, the output end of the high-pass filter is connected with the input end of the digital integrator, the output end of the digital integrator is connected with the input end of the waveform register II, the output end of the waveform register II is connected with the input end of the logic control circuit, the output end of the logic control circuit;
the power taking and supplying module respectively supplies power to the high-frequency signal acquisition module, the power frequency signal acquisition module and the logic controller.
3. The digital linear ac voltage transformer for multiband measurement of claim 2, wherein the logic controller is a timing control circuit.
4. The digital linear ac voltage transformer for multiband measurement of claim 1, wherein the linear voltage divider is a capacitive voltage divider or a resistive voltage divider.
5. The digital linear ac voltage transformer for multiband measurement according to claim 1, wherein said optoelectronic isolation transmission module is composed of an optical transmitter, an optical fiber, and an optical receiver in sequence; the optical transmitter consists of an LED type luminous transmitter and a modulation and driving circuit thereof, and converts the sampling digital electric signal into an optical data stream; the optical receiver is arranged at the bottom of the voltage divider equipment or a local measurement and control box of a transformer substation.
6. The digital linear ac voltage transformer for multiband measurement according to claim 1, wherein said signal frequency dividing module is a 150Hz to 600Hz intermediate frequency band pass active filter and a 30kHz and above high frequency band pass active filter, and their input terminals are connected to the optoelectronic isolation transmission module, and their output terminals are connected to the harmonic output interface and the high frequency output interface, respectively.
7. The digital linear ac voltage transformer for multiband measurement according to claim 1, wherein said power frequency output interface is mainly composed of an SDP data processing module and an ethernet output interface; the output end of the SDP data processing module is connected with the Ethernet output interface, and the input end of the SDP data processing module is connected with the output end of the photoelectric isolation transmission module.
8. The digital linear ac voltage transformer for multiband measurement according to claim 1, wherein said harmonic output interface is mainly composed of an intermediate frequency digital signal amplifier, a high frequency filter II, a low frequency filter I, and a follower I connected in series in sequence, and outputs through an ethernet port; the high-frequency output interface mainly comprises a high-frequency digital signal amplifier, a low-frequency filter II and a follower II, wherein the follower II outputs signals through an Ethernet port, and the follower II is also connected with the high-speed data cache.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205012125U CN201765263U (en) | 2010-08-23 | 2010-08-23 | Digital multi-band measuring linear alternating-current voltage transformer |
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| CN2010205012125U CN201765263U (en) | 2010-08-23 | 2010-08-23 | Digital multi-band measuring linear alternating-current voltage transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916648A (en) * | 2010-08-23 | 2010-12-15 | 山东电力研究院 | Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916648A (en) * | 2010-08-23 | 2010-12-15 | 山东电力研究院 | Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof |
| CN101916648B (en) * | 2010-08-23 | 2011-11-09 | 山东电力研究院 | Digital type linear alternating voltage transformer of multi-frequency range measurement and measuring method thereof |
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Granted publication date: 20110316 Effective date of abandoning: 20111109 |