CN104865427A - Precise high-current transient current rise generating device - Google Patents
Precise high-current transient current rise generating device Download PDFInfo
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Abstract
The invention discloses a precise high-current transient current rise generating device, which comprises an IO input device unit, a microcomputer control unit, a digital signal control processing unit, a D/A converter, an A/D converter, an output current acquisition unit, a high-power linear current power amplifier unit and a three-phase DC rectifier filter power supply for providing power for the high-power linear current power amplifier unit. The current acquisition unit acquires and measures transient high-current signals, the A/D converter converts the transient high-current signals into digital signals, the digital signals are transmitted to the digital signal control processing unit, and the amplitude and the waveform of the transient high-current signals are obtained through operation processing by the microcomputer control unit. Operation calculation processing on transient signals in many ways is completed via the microcomputer control unit, and through control on the D/A converter by the digital signal control processing unit, output of the transient analog signals is realized.
Description
Technical field
The present invention relates to electrical power system transient technical field of measurement and test, particularly relate to a kind of transient state up-flow generating means of accurate big current.
Background technology
Along with the fast development that China's intelligent grid is built, various novel electronic current mutual inductor uses more and more in extra-high voltage electric transmission and transformation system.The electronic current mutual inductor of these principle of work method advanced persons is by the power supply current value sensing detection of electrical network supply electric system second protection and measuring apparatus.The current signal that electric system utilizes electronic current mutual inductor sensing detection once to survey comprises the steady state current signals of primary current, transient current signal and various fault-current signal, and the protection of electric system secondary side and metering outfit are through completing emergency protection and the electric energy metrical of electric system according to these current signals.
Electric mutual inductor has plurality of advantages compared with conventional electromagnetic mutual inductor, such as: electric mutual inductor has without magnetic saturation, frequency response range is wide, transient characterisitics good, insulation system simply, does not exist second open circuit or short circuit hidden danger etc.; Can export with digital signal; Instead of cable with optical cable in transmission, fundamentally solve the additive error that mutual inductor produces in electric current, voltage signal transmitting procedure; Be conducive to transformer station and realize data sharing; Higher degree automation of transformation substations demand can be met.
In order to ensure the accuracy of electric mutual inductor, guaranteeing security of system, stablizing, must test these electronic mutual inductors.But, compared with traditional mutual inductor. and electric mutual inductor there occurs basic change in the mode of measuring principle, structure and output signal, and traditional mutual inductor measuring method for testing is not suitable for electric mutual inductor.
At present to the performance test of the electronic current mutual inductor that electric system primary side uses, generally manually by the test current of the given tested current transformer of the mode of rising current transformer manual adjustments, then by the artificial secondary current being measured this current transformer by multimeter.Such test, can cause excessive personal error on the one hand, be difficult to ensure high-precision test result, be with serve potential safety hazard to experimental test personnel; The steady-state value of electronic current mutual inductor can only be tested on the other hand, the various transient characterisitics parameters of electronic current mutual inductor can not be tested.
And along with the domestic demand to electronic current mutual inductor field-checking get more and more, not only require the output current of this type of current feedback circuit can a few peace to thousands of peace on a large scale in continuously adjustabe, but also the Steady state and transient state big current of standing wave shape will be exported to according to national standard, ensure the high precision of output current, high stability simultaneously; And in order to meet the demand of on-the-spot test, ensure that this type of power volume is little, lightweight, reliability is high.But also do not meet the transient state up-flow generating means of the accurate big current of above-mentioned whole requirement at present.
Summary of the invention
The object of this invention is to provide a kind of transient state up-flow generating means of accurate big current, can test accurately the transient characterisitics of electric system primary side electronic current mutual inductor.
The present invention adopts following technical proposals:
A transient state up-flow generating means for accurate big current, comprises IO input equipment unit, microcomputer control unit, Digital Signals processing unit, D/A transducer, A/D transducer, output current collecting unit, high-power linear current Power Amplifier Unit and the three-phase dc rectification filtering power for powering to described high-power linear current Power Amplifier Unit; Described IO input equipment unit is connected with microcomputer control unit, described microcomputer control unit is connected with Digital Signals processing unit, described Digital Signals processing unit is connected with the output terminal of described A/D transducer with the input end of described D/A transducer respectively, and the output terminal of D/A transducer is connected with the input end of described high-power linear current Power Amplifier Unit; The output terminal of high-power linear current Power Amplifier Unit is connected with the Gather and input end of output current collecting unit, and the output port of output current collecting unit connects the input end of A/D transducer.
Described three-phase dc rectification filtering power is connected with three-phase input power by three-phase isolation rectification transformer, exports to described three-phase dc rectification filtering power through isolated buck.
Described Digital Signals processing unit is made up of high-speed dsp and FPGA.
Described IO input equipment unit comprises and being made up of industrial computer, keyboard, display, USB interface and network interface, and described keyboard, display, USB interface are connected with industrial computer respectively with network interface.
Described microcomputer control unit is primarily of CPU compositions such as industrial computer, Desktop PC, notebook computers.
The transient state simulating signal that described high-power linear current Power Amplifier Unit is used for being controlled by described Digital Signals processing unit to export through described D/A transducer conversion is amplified, there is transient heavy current and export to load, the transient heavy current signal exported is measured through described output current collecting unit collection and is transformed to digital quantity through described A/D transducer, calculate through described Digital Signals processing unit and described microcomputer control unit and control, output display transient current waveform and amplitude.
Described microcomputer control unit, for the treatment of the I/O device unit input and output such as described keyboard, display, USB port, network interface signal instruction and run relative application software instrument and produce transient current digital controlled signal needed for device, control described Digital Signals processing unit, the transient state simulating signal of the correspondence exported by described D/A transducer conversion.
The present invention measures transient heavy current signal by the collection of current acquisition unit, by A/D transducer, transient heavy current signal is transformed to digital data transmission to Digital Signals processing unit, run process through microcomputer control unit, obtain amplitude and the waveform of transient heavy current signal.Simultaneously by running parameter setting and the control operation of the I/O device unit finishing devices such as keyboard, display, USB port, network interface, the moving calculation process of the transient signal of various ways is completed by microcomputer control unit, through the control of Digital Signals processing unit to D/A transducer, realize transient state analog signal output.The accurate transient heavy current waveform distortion produced by device of the present invention and method for generation is little, bandwidth, and response is fast.The state current amplitude exported and waveform can be presented at display screen by microcomputer control unit in real time, and are stored in external equipment by I/O port.Multiple transient signal method for generation is convenient to the integration test tested the transient characterisitics of electric system primary electron formula current transformer.
Accompanying drawing explanation
Fig. 1 is structural principle block diagram of the present invention.
Embodiment
A transient state up-flow generating means for accurate big current as shown in Figure 1, comprises IO input equipment unit, microcomputer control unit, Digital Signals processing unit, D/A transducer, A/D transducer, output current collecting unit, high-power linear current Power Amplifier Unit and the three-phase dc rectification filtering power for powering to described high-power linear current Power Amplifier Unit; Described IO input equipment unit is connected with microcomputer control unit, described microcomputer control unit is connected with Digital Signals processing unit, described Digital Signals processing unit is connected with the output terminal of described A/D transducer with the input end of described D/A transducer respectively, and the output terminal of D/A transducer is connected with the input end of described high-power linear current Power Amplifier Unit; The output terminal of high-power linear current Power Amplifier Unit is connected with the Gather and input end of output current collecting unit, and the output port of output current collecting unit connects the input end of A/D transducer.
Described three-phase dc rectification filtering power is connected with three-phase input power by three-phase isolation rectification transformer, exports to described three-phase dc rectification filtering power through isolated buck.Described Digital Signals processing unit is made up of high-speed dsp and FPGA.
Described IO input equipment unit comprises and being made up of industrial computer, keyboard, display, USB interface and network interface, and described keyboard, display, USB interface are connected with industrial computer respectively with network interface.The peripheral I/O devices of unit, mainly completes the output to the input of the optimum configurations of apparatus of the present invention and test data, figure, report.Described microcomputer control unit is primarily of CPU compositions such as industrial computer, Desktop PC, notebook computers.
The transient state simulating signal that described high-power linear current Power Amplifier Unit is used for being controlled by described Digital Signals processing unit to export through the conversion of D/A transducer is amplified, there is transient heavy current and export to load, the transient heavy current signal exported is measured through described output current collecting unit collection and is transformed to digital quantity through described A/D transducer, calculate through described Digital Signals processing unit and described microcomputer control unit and control, output display transient current waveform and amplitude.
Described microcomputer control unit, for the treatment of the I/O device unit input and output such as described keyboard, display, USB port, network interface signal instruction and run relative application software instrument and produce transient current digital controlled signal needed for device, control described Digital Signals processing unit, the transient state simulating signal of the correspondence exported by described D/A transducer conversion.
Below the principle of work of accurate big current transient state up-flow device of the present invention is summarized as follows:
The present invention is completed by three-phase isolation rectification transformer and isolates the step-down of input power, direct supply is exported to high-power linear current Power Amplifier Unit through three-phase dc rectification filtering power rectifying and wave-filtering, the transient current signal that D/A transducer inputs is carried out power amplification by high-power linear current Power Amplifier Unit, exports transient heavy current power signal and tests to tested device.
In device, output current collecting unit is connected with the output of high-power linear current Power Amplifier Unit, gather and measure transient heavy current signal, output current collecting unit is connected with A/D transducer, by A/D transducer, transient heavy current signal is transformed to digital data transmission to Digital Signals processing unit, process is run through microcomputer control unit, obtain amplitude and the waveform of transient heavy current signal, the amplitude of described transient heavy current signal and waveform are through I/O device unit display translation such as keyboard, display, USB port, network interfaces.Simultaneously by running parameter setting and the control operation of the I/O device unit finishing devices such as keyboard, display, USB port, network interface, the moving calculation process of the transient signal of various ways is completed by microcomputer control unit, through the control of Digital Signals processing unit to D/A transducer, realize transient state analog signal output.Wherein the moving calculation of the transient signal of various ways is treated to known technology in field, and illustrating no longer one by one at this repeats.
Claims (7)
1. a transient state up-flow generating means for accurate big current, is characterized in that: comprise IO input equipment unit, microcomputer control unit, Digital Signals processing unit, D/A transducer, A/D transducer, output current collecting unit, high-power linear current Power Amplifier Unit and the three-phase dc rectification filtering power for powering to described high-power linear current Power Amplifier Unit; Described IO input equipment unit is connected with microcomputer control unit, described microcomputer control unit is connected with Digital Signals processing unit, described Digital Signals processing unit is connected with the output terminal of described A/D transducer with the input end of described D/A transducer respectively, and the output terminal of D/A transducer is connected with the input end of described high-power linear current Power Amplifier Unit; The output terminal of high-power linear current Power Amplifier Unit is connected with the Gather and input end of output current collecting unit, and the output port of output current collecting unit connects the input end of A/D transducer.
2. the transient state up-flow generating means of accurate big current according to claim 1, it is characterized in that: described three-phase dc rectification filtering power is connected with three-phase input power by three-phase isolation rectification transformer, exports to described three-phase dc rectification filtering power through isolated buck.
3. the transient state up-flow generating means of accurate big current according to claim 2, is characterized in that: described Digital Signals processing unit is made up of high-speed dsp and FPGA.
4. the transient state up-flow generating means of accurate big current according to claim 3, it is characterized in that: described IO input equipment unit comprises and being made up of industrial computer, keyboard, display, USB interface and network interface, and described keyboard, display, USB interface are connected with industrial computer respectively with network interface.
5. the transient state up-flow generating means of accurate big current according to claim 4, is characterized in that: described microcomputer control unit is primarily of CPU compositions such as industrial computer, Desktop PC, notebook computers.
6. the transient state up-flow generating means of accurate big current according to claim 5, it is characterized in that: the transient state simulating signal that described high-power linear current Power Amplifier Unit is used for being controlled by described Digital Signals processing unit to export through described D/A transducer conversion is amplified, there is transient heavy current and export to load, the transient heavy current signal exported is measured through described output current collecting unit collection and is transformed to digital quantity through described A/D transducer, calculate through described Digital Signals processing unit and described microcomputer control unit and control, output display transient current waveform and amplitude.
7. the transient state up-flow generating means of accurate big current according to claim 6, it is characterized in that: described microcomputer control unit, for the treatment of the I/O device unit input and output such as described keyboard, display, USB port, network interface signal instruction and run relative application software instrument and produce transient current digital controlled signal needed for device, control described Digital Signals processing unit, the transient state simulating signal of the correspondence exported by described D/A transducer conversion.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528485A (en) * | 2017-10-10 | 2017-12-29 | 浙江嘉科电子有限公司 | A kind of high current waveform generator |
| CN108134524A (en) * | 2017-12-18 | 2018-06-08 | 中国电子科技集团公司第四十研究所 | A kind of programme-controlled dc power control circuit |
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| CN102435799A (en) * | 2011-04-15 | 2012-05-02 | 北京博电新力电气股份有限公司 | Precise large current generation device and generation method thereof |
| CN103176006A (en) * | 2013-03-13 | 2013-06-26 | 江苏省电力公司电力科学研究院 | Arbitrary-waveform heavy current generator based on power amplifiers in parallel |
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2015
- 2015-05-29 CN CN201510290712.6A patent/CN104865427B/en active Active
Patent Citations (6)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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Inventor after: Han Wei Inventor after: Wang Chengbo Inventor after: Shi Guang Inventor after: Liu Lei Inventor after: Liu Chao Inventor after: Ma Weidong Inventor after: Song Chuang Inventor after: Shi Chen Inventor after: Zhang Feng Inventor after: Li Zhibing Inventor before: Shi Guang Inventor before: Li Lei Inventor before: Wang Yi Inventor before: Ma Weidong Inventor before: Luo Haibing Inventor before: Ma Jiansheng Inventor before: Sun Liang Inventor before: Li Zhibing Inventor before: Wang Chengbo Inventor before: Han Wei Inventor before: Zhao Jun Inventor before: Wu Chunhong Inventor before: Liu Lei Inventor before: Kong Shengli Inventor before: Zhao Wenpei Inventor before: Xu Pengyu Inventor before: Guan Yanwei |
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