CN105067851A - Signal generating device for power system energized test instrument calibration - Google Patents
Signal generating device for power system energized test instrument calibration Download PDFInfo
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Abstract
The invention discloses a signal generating device for power system energized test instrument calibration. The signal generating device includes a signal generator, a reference signal power amplifier, a test signal power amplifier, a selecting switch, a reference voltage output channel, a reference current output channel, a test current output channel, a reference voltage sampling feedback circuit, a reference current sampling feedback circuit and a test current sampling feedback circuit. With the signal generating device adopted, voltage, current and phase signals of all kinds of field equipment can be generated in a simulated manner, and relative dielectric loss measurement can be performed on capacitive equipment effectively, and resistance current measurement can be performed on a metal oxide lightning arrester, and the grounding current of the iron core of a transformer can be measured, and the reliability of field test data can be ensured.
Description
Technical field
The present invention relates to signal generator technical field, particularly relate to a kind of signal generation apparatus for the verification of electric system live testing instrument.
Background technology
In order to ensure the operation safely and reliably of electric system, all kinds of high-voltage electrical equipments in electric system all need regularly to carry out Performance Detection, traditional detection experiment all carries out under power failure, can bring loss like this, can not meet the demand of vast power consumer to the power supply of electrical network.Therefore, do not have a power failure test demand more and more urgent.Recent year has also carried out the pilot project that do not have a power failure of all kinds of electric equipment gradually, wherein the current in resistance property of the relative dielectric loss measurement of capacitive apparatus, metal oxide arrester is measured, the measurement of transformer iron core grounding current wherein carries out pilot project comparatively early, each instrument manufacturer facility man is also proposed respective product, but product performance index is uneven at present, the industry standard of correlation test lacks, therefore how this quasi-instrument effectively identified and check, ensureing the reliability of field test data, is problem in the urgent need to address at present.
This few class live testing instrument has two kinds of checking modes usually: absolute method and relative method, and wherein, absolute method is that the current signal of testing apparatus is as test signal using the voltage transformer secondary voltage signal on on-the-spot bus as reference signal.Relative method is using the current signal of the capacitive apparatus of under same bus as with reference to signal, removes the current signal measuring another capacitive apparatus.Therefore, the analog signal generator carrying out verifying to live testing instrument also needs to possess above two kinds of different checking modes.
For this reason, applicant, through useful exploration and research, have found result of the above problems, and technical scheme described below produces under this background.
Summary of the invention
The object of the invention is to: a kind of signal generation apparatus for the verification of electric system live testing instrument is provided.
Technical matters solved by the invention can realize by the following technical solutions:
For a signal generation apparatus for electric system live testing instrument verification, comprise
One signal generator that can produce reference signal and test signal, described signal generator has a reference signal generation output terminal, a test signal generation output terminal and a feedback signal input terminal;
One reference signal power amplifier, described reference signal power amplifier has a reference signal and amplifies input end and reference signal amplification output terminal, and the reference signal of described reference signal power amplifier is amplified input end and is connected with the reference signal generation output terminal of described signal generator;
One test signal power amplifier, described test signal power amplifier has a test signal and amplifies input end and test signal amplification output terminal, and the test signal of described test signal power amplifier is amplified input end and is connected with the test signal generation output terminal of described signal generator;
One selector switch, described selector switch has an input end and switchable first output terminal and the second output terminal, and the input end of described selector switch amplifies output terminal with the reference signal of described reference signal power amplifier and is connected;
One reference voltage output channel, described reference voltage output channel has a voltage input end and a voltage output end, and the voltage input end of described reference voltage output channel is connected with the first output terminal of described selector switch;
One reference current output channel, described reference current output channel has a current input terminal and a current output terminal, and the current input terminal of described reference current output channel is connected with the second output terminal of described selector switch;
One measuring current output channel, described measuring current output channel has a current input terminal and a current output terminal, and the current input terminal of described measuring current output channel amplifies output terminal with the test signal of described test signal power amplifier and is connected;
One reference voltage sampling feedback circuit, described reference voltage sampling feedback circuit has a reference voltage collection terminal, a reference voltage output terminal and a reference voltage feedback end, the reference voltage collection terminal of described reference voltage sampling feedback circuit is connected with the voltage output end of described reference voltage output channel, its reference voltage output terminal is as the reference voltage output terminal of described signal generation apparatus, and its reference voltage feedback end is connected with the feedback signal input terminal of described signal generator;
One reference current sampling feedback circuit, described reference current sampling feedback circuit has a reference current collection terminal, a reference current output terminal and a reference current feedback end, the reference current collection terminal of described reference current sampling feedback circuit is connected with the current output terminal of described reference current output channel, its reference current output terminal is as the reference current output terminal of described signal generation apparatus, and its reference current feedback end is connected with the feedback signal input terminal of described signal generator; And
One measuring current sampling feedback circuit, described measuring current feedback circuit has a measuring current collection terminal, a measuring current output terminal and a measuring current feedback end, the measuring current collection terminal of described measuring current sampling feedback circuit is connected with the current output terminal of described measuring current output channel, its measuring current output terminal is as the measuring current output terminal of described signal generation apparatus, and its measuring current feedback end is connected with the feedback signal input terminal of described signal generator.
In a preferred embodiment of the invention, described signal generator comprises:
One for the external serial ports of responsible reception parameters and according to the first single-chip microcomputer of described device parameter synthesized reference signal and test signal, described first single-chip microcomputer has first, second, third signal output part;
One second singlechip, described second singlechip has first, second signal input part and first, second signal output part, the first signal input part of described second singlechip and the first signal output part of described first single-chip microcomputer;
One frequency multiplier, described frequency multiplier has first, second frequency modulation input end and frequency modulation output terminal, first, second frequency modulation input end of described frequency multiplier is connected with the secondary signal output terminal of the first single-chip microcomputer and the first signal output part of second singlechip respectively, and the frequency modulation output terminal of described frequency multiplier is connected with the secondary signal input end of second singlechip;
First digital to analog converter, described first digital to analog converter has signal conversion inputs and first, second signal conversion output, and the signal conversion inputs of described first digital to analog converter is connected with the secondary signal output terminal of second singlechip;
First, second multiplier, first, second multiplier described has first, second amplitude modulation input end and amplitude modulation output terminal respectively, first amplitude modulation input end of first, second multiplier described is connected with first, second signal conversion output of the first digital to analog converter respectively, and the amplitude modulation output terminal of first, second multiplier described is respectively as the reference signal generation output terminal of described signal generator and test signal generation output terminal;
Second digital to analog converter, described second digital to analog converter has signal conversion inputs and signal conversion output, and the signal conversion inputs of described second digital to analog converter is connected with the 3rd signal output part of the first single-chip microcomputer;
One operational amplifier, described operational amplifier has first, second computing input end and first, second computing output terminal, first computing input end of described operational amplifier is connected with the signal conversion output of the second digital to analog converter, and first, second computing output terminal of described operational amplifier is connected with the second amplitude modulation input end of first, second multiplier; And
One feedback circuit, described feedback circuit has a feedback signal input terminal and a feedback signal output, the feedback signal input terminal of described feedback circuit is as the feedback signal input terminal of described signal generator, and described feedback signal output is connected with the second computing input end of described operational amplifier.
Owing to have employed technical scheme as above, beneficial effect of the present invention is: signal generation apparatus of the present invention can simulate the voltage, electric current and the phase signal that produce all kinds of field apparatus, effectively relative dielectric loss measurement is carried out to capacitive apparatus, current in resistance property measurement and the measurement to transformer iron core grounding current are carried out to metal oxide arrester, ensures the reliability of field test data.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is FB(flow block) of the present invention.
Fig. 2 is the structural representation of signal generator of the present invention.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
See Fig. 1, what provide in figure is a kind of signal generation apparatus for the verification of electric system live testing instrument, comprises signal generator 100, reference signal power amplifier 200, test signal power amplifier 300, selector switch 400, reference voltage output channel 510, reference current output channel 520, measuring current output channel 530, reference voltage sampling feedback circuit 610, reference current sampling feedback circuit 620 and measuring current sampling feedback circuit 630.
Signal generator 100 can produce reference signal and test signal, see Fig. 2, signal generator 100 comprises first, second single-chip microcomputer 110a, 110b, frequency multiplier 120, first, second digital to analog converter 130a, 130b, first, second multiplier 140a, 140b, operational amplifier 150 and feedback circuit 160.
First single-chip microcomputer 110a has first, second, third signal output part 111a, 112a and 113a.Second singlechip 110b has first, second signal input part 111b, 112b and first, second signal output part 113b, 114b.The first signal input part 111a of second singlechip 110b and the first signal output part 111a of the first single-chip microcomputer 110a.
Frequency multiplier 120 has first, second frequency modulation input end 121,122 and frequency modulation output terminal 123, first, second frequency modulation input end 121,122 of frequency multiplier 120 is connected with the secondary signal output terminal 112a of the first single-chip microcomputer 110a and the first signal output part 111b of second singlechip 110b respectively, and the frequency modulation output terminal 123 of frequency multiplier 120 is connected with the secondary signal input end 112b of second singlechip 110b.
First digital to analog converter 130a has signal conversion inputs 131a and first, second signal conversion output 132a, 133a, and the signal conversion inputs 131a of the first digital to analog converter 130a is connected with the secondary signal output terminal 114b of second singlechip 110b.
First, second multiplier 140a, 140b have first, second amplitude modulation input end 141a, 142a, 141b, 142b and amplitude modulation output terminal 143a, 143b respectively, first amplitude modulation input end 141a, 141b of first, second multiplier 140a, 140b is connected with first, second signal conversion output 132a, 133a of the first digital to analog converter 130a respectively, and amplitude modulation output terminal 143a, 143b of first, second multiplier 140a, 140b are respectively as the reference signal generation output terminal 101 of signal generator 100 and test signal generation output terminal 102.
Second digital to analog converter 130b has signal conversion inputs 131b and signal conversion output 132b, and the signal conversion inputs 131b of the second digital to analog converter 130b is connected with the 3rd signal output part 113a of the first single-chip microcomputer 110a.
Operational amplifier 150 has first, second computing input end 151,152 and first, second computing output terminal 153,154, first computing input end 151 of operational amplifier 150 is connected with the signal conversion output 132b of the second digital to analog converter 130b, and first, second computing output terminal 153,154 of operational amplifier 150 is connected with second amplitude modulation input end 142a, 142b of first, second multiplier 140a, 140b.
Feedback circuit 160 has feedback signal input terminal 161 and a feedback signal output 162, the feedback signal input terminal 161 of feedback circuit 160 is as the feedback signal input terminal 103 of signal generator 100, and the feedback signal output 162 of feedback circuit 160 is connected with the second computing input end 152 of operational amplifier 150.
First single-chip microcomputer 110a is used for the parameters being responsible for receiving external serial ports, and according to this device parameter synthesized reference signal and test signal, this reference signal and test signal are Wave data (containing first-harmonic and each harmonic), each cycle is divided into 1000 data, then the Wave data of Reference Signal and test signal is sent to second singlechip 110b, the time synchronized that second singlechip 110b Reference Signal and test signal have more setting outputs in the first digital to analog converter 130a, so the first digital to analog converter 130a exports the simulating signal of two-way synthesis, one tunnel is as reference signal, another road is as test signal.
Adopt first, second multiplier 140a, 140b as amplitude modulator, for regulating the output voltage of the second digital to analog converter 130b, so just can the amplitude size of regulation output signal.
Utilize the timer of second singlechip 110b to produce the reference signal of the 50Hz of a standard, be input to frequency multiplier 120, the Clock Multiplier Factor of frequency multiplier 120 is set by the frequency divider of the first single-chip microcomputer 110a.By setting different divide ratio, make frequency multiplier 120 export different swept-frequency signals, Wave data is exported to the first digital to analog converter 130a according to this swept-frequency signal by second singlechip 110b one by one, so just can reach the function that signal frequency regulates.
The reference signal that signal generator 100 finally exports and test signal are sampled by electric current and voltage, be input to feedback circuit 160, adopt operational amplifier 150 that the amplitude modulation reference signal that feedback signal and the second digital to analog converter 130b export is carried out application condition, and the output signal of operational amplifier 150 is received the amplitude modulation input of first, second multiplier 140a, 140b, material is thus formed the closed loop exported with reference signal, ensure the amplitude remaining constant of output signal.
Reference signal power amplifier 200 has a reference signal and amplifies input end 210 and reference signal amplification output terminal 220, and the reference signal of reference signal power amplifier 200 is amplified input end 210 and is connected with the reference signal generation output terminal 101 of signal generator 100.Because the output of the reference signal that signal generator 100 exports can promote the load of standard scale, so need Reference Signal to carry out power amplification, the maximum output current of reference signal power amplifier 200 can reach 10A, and reference signal power amplifier 200 can drive voltage, the electric current output transformer of rear class.
Test signal power amplifier 300 has a test signal and amplifies input end 310 and test signal amplification output terminal 320, and the test signal of test signal power amplifier 300 is amplified input end 310 and is connected with the test signal generation output terminal 102 of signal generator 100.Because the output of the test signal that signal generator 100 exports can promote the load of standard scale and test chart, so need test signal to carry out power amplification, the maximum output current of test signal power amplifier 300 can reach 10A, and test signal power amplifier 300 can drive voltage, the electric current output transformer of rear class.
The first output terminal 420 and the second output terminal 430 that selector switch 400 has an input end 410 and can mutually switch, the input end 410 of selector switch 400 amplifies output terminal 220 with the reference signal of reference signal power amplifier 200 and is connected.Different checking modes can be selected by selector switch 400.
Reference voltage output channel 510 has voltage input end 511 and a voltage output end 512, and the voltage input end 511 of reference voltage output channel 510 is connected with the first output terminal 420 of selector switch 400.Reference voltage output channel 510, primarily of a voltage output transformer and one group of gear switch relay composition, varies in size according to output voltage, switches different output gears.
Reference current output channel 520 has current input terminal 521 and a current output terminal 522, and the current input terminal 521 of reference current output channel 520 is connected with the second output terminal 430 of selector switch 400.Reference current output channel 520, primarily of an electric current output transformer and one group of gear switch relay composition, varies in size according to output current, switches different output gears.
Measuring current output channel 530 has current input terminal 531 and a current output terminal 532, and the current input terminal 531 of measuring current output channel 530 amplifies output terminal 320 with the test signal of test signal power amplifier 300 and is connected.Measuring current output channel 530, primarily of an electric current output transformer and one group of gear switch relay composition, varies in size according to output current, switches different output gears.
Reference voltage sampling feedback circuit 610 has reference voltage collection terminal 611, reference voltage output terminal 612 and a reference voltage feedback end 613, the reference voltage collection terminal 611 of reference voltage sampling feedback circuit 610 is connected with the voltage output end 512 of reference voltage output channel 510, its reference voltage output terminal 612 is as the reference voltage output terminal of signal generation apparatus of the present invention, and its reference voltage feedback end 613 is connected with the feedback signal input terminal 103 of signal generator 100.What reference voltage sampling feedback circuit 610 was sampled is that resistance pressure-dividing network and operational amplifier realize, and obtains the feedback voltage of normalizing according to different gears with different intrinsic standoff ratios.
Reference current sampling feedback circuit 620 has reference current collection terminal 621, reference current output terminal 622 and a reference current feedback end 623, the reference current collection terminal 621 of reference current sampling feedback circuit 620 is connected with the current output terminal 522 of reference current output channel 520, its reference current output terminal 622 is as the reference current output terminal of signal generation apparatus of the present invention, and its reference current feedback end 623 is connected with the feedback signal input terminal 103 of signal generator 100.The sampling of reference current sampling feedback circuit 620 be that current transformer and operational amplifier realize, according to different gears with different electric currents than the feedback voltage obtaining normalizing.
Measuring current sampling feedback circuit 630 has measuring current collection terminal 631, measuring current output terminal 632 and a measuring current feedback end 633, the measuring current collection terminal 631 of measuring current sampling feedback circuit 630 is connected with the current output terminal 532 of measuring current output channel 530, its measuring current output terminal is as the measuring current output terminal of signal generation apparatus of the present invention, and its measuring current feedback end 633 is connected with the feedback signal input terminal 103 of signal generator 100.The sampling of measuring current sampling feedback circuit 630 be that current transformer and operational amplifier realize, according to different gears with different electric currents than the feedback voltage obtaining normalizing.
Signal generation apparatus of the present invention can simulate the voltage, electric current and the phase signal that produce all kinds of field apparatus, effectively relative dielectric loss measurement is carried out to capacitive apparatus, current in resistance property measurement and the measurement to transformer iron core grounding current are carried out to metal oxide arrester, ensures the reliability of field test data.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (2)
1., for a signal generation apparatus for electric system live testing instrument verification, it is characterized in that, comprise
One signal generator that can produce reference signal and test signal, described signal generator has a reference signal generation output terminal, a test signal generation output terminal and a feedback signal input terminal;
One reference signal power amplifier, described reference signal power amplifier has a reference signal and amplifies input end and reference signal amplification output terminal, and the reference signal of described reference signal power amplifier is amplified input end and is connected with the reference signal generation output terminal of described signal generator;
One test signal power amplifier, described test signal power amplifier has a test signal and amplifies input end and test signal amplification output terminal, and the test signal of described test signal power amplifier is amplified input end and is connected with the test signal generation output terminal of described signal generator;
One selector switch, described selector switch has an input end and switchable first output terminal and the second output terminal, and the input end of described selector switch amplifies output terminal with the reference signal of described reference signal power amplifier and is connected;
One reference voltage output channel, described reference voltage output channel has a voltage input end and a voltage output end, and the voltage input end of described reference voltage output channel is connected with the first output terminal of described selector switch;
One reference current output channel, described reference current output channel has a current input terminal and a current output terminal, and the current input terminal of described reference current output channel is connected with the second output terminal of described selector switch;
One measuring current output channel, described measuring current output channel has a current input terminal and a current output terminal, and the current input terminal of described measuring current output channel amplifies output terminal with the test signal of described test signal power amplifier and is connected;
One reference voltage sampling feedback circuit, described reference voltage sampling feedback circuit has a reference voltage collection terminal, a reference voltage output terminal and a reference voltage feedback end, the reference voltage collection terminal of described reference voltage sampling feedback circuit is connected with the voltage output end of described reference voltage output channel, its reference voltage output terminal is as the reference voltage output terminal of described signal generation apparatus, and its reference voltage feedback end is connected with the feedback signal input terminal of described signal generator;
One reference current sampling feedback circuit, described reference current sampling feedback circuit has a reference current collection terminal, a reference current output terminal and a reference current feedback end, the reference current collection terminal of described reference current sampling feedback circuit is connected with the current output terminal of described reference current output channel, its reference current output terminal is as the reference current output terminal of described signal generation apparatus, and its reference current feedback end is connected with the feedback signal input terminal of described signal generator; And
One measuring current sampling feedback circuit, described measuring current feedback circuit has a measuring current collection terminal, a measuring current output terminal and a measuring current feedback end, the measuring current collection terminal of described measuring current sampling feedback circuit is connected with the current output terminal of described measuring current output channel, its measuring current output terminal is as the measuring current output terminal of described signal generation apparatus, and its measuring current feedback end is connected with the feedback signal input terminal of described signal generator.
2., as claimed in claim 1 for the signal generation apparatus of electric system live testing instrument verification, it is characterized in that, described signal generator comprises:
One for the external serial ports of responsible reception parameters and according to the first single-chip microcomputer of described device parameter synthesized reference signal and test signal, described first single-chip microcomputer has first, second, third signal output part;
One second singlechip, described second singlechip has first, second signal input part and first, second signal output part, the first signal input part of described second singlechip and the first signal output part of described first single-chip microcomputer;
One frequency multiplier, described frequency multiplier has first, second frequency modulation input end and frequency modulation output terminal, first, second frequency modulation input end of described frequency multiplier is connected with the secondary signal output terminal of the first single-chip microcomputer and the first signal output part of second singlechip respectively, and the frequency modulation output terminal of described frequency multiplier is connected with the secondary signal input end of second singlechip;
First digital to analog converter, described first digital to analog converter has signal conversion inputs and first, second signal conversion output, and the signal conversion inputs of described first digital to analog converter is connected with the secondary signal output terminal of second singlechip;
First, second multiplier, first, second multiplier described has first, second amplitude modulation input end and amplitude modulation output terminal respectively, first amplitude modulation input end of first, second multiplier described is connected with first, second signal conversion output of the first digital to analog converter respectively, and the amplitude modulation output terminal of first, second multiplier described is respectively as the reference signal generation output terminal of described signal generator and test signal generation output terminal;
Second digital to analog converter, described second digital to analog converter has signal conversion inputs and signal conversion output, and the signal conversion inputs of described second digital to analog converter is connected with the 3rd signal output part of the first single-chip microcomputer;
One operational amplifier, described operational amplifier has first, second computing input end and first, second computing output terminal, first computing input end of described operational amplifier is connected with the signal conversion output of the second digital to analog converter, and first, second computing output terminal of described operational amplifier is connected with the second amplitude modulation input end of first, second multiplier; And
One feedback circuit, described feedback circuit has a feedback signal input terminal and a feedback signal output, the feedback signal input terminal of described feedback circuit is as the feedback signal input terminal of described signal generator, and described feedback signal output is connected with the second computing input end of described operational amplifier.
Owing to have employed technical scheme as above, beneficial effect of the present invention is: signal generation apparatus of the present invention can simulate the voltage, electric current and the phase signal that produce all kinds of field apparatus, effectively relative dielectric loss measurement is carried out to capacitive apparatus, current in resistance property measurement and the measurement to transformer iron core grounding current are carried out to metal oxide arrester, ensures the reliability of field test data.
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| CN107144711A (en) * | 2017-06-07 | 2017-09-08 | 中广核研究院有限公司 | A kind of signal generator and handheld digital pulse and electric current tester |
| CN113433502A (en) * | 2021-07-28 | 2021-09-24 | 武汉市华英电力科技有限公司 | Capacitance and inductance tester calibration method and device based on waveform simulation |
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| Publication number | Publication date |
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| CN105067851B (en) | 2018-05-08 |
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