CN101393255A - Verifying apparatus for zinc oxide arrester tester - Google Patents
Verifying apparatus for zinc oxide arrester tester Download PDFInfo
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- CN101393255A CN101393255A CNA2008101975501A CN200810197550A CN101393255A CN 101393255 A CN101393255 A CN 101393255A CN A2008101975501 A CNA2008101975501 A CN A2008101975501A CN 200810197550 A CN200810197550 A CN 200810197550A CN 101393255 A CN101393255 A CN 101393255A
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Abstract
The invention discloses a checking apparatus for a zinc oxide lightening arrester tester. The checking device comprises a controller, signal generation modules, precision current source modules, reference voltage circuit signal conditioning modules, precision four-terminal resistors and precision voltage transformers. Under the control of the controller, each signal generation module generates an independent highly-smooth sinusoidal signal with adjustable amplitude, frequency and phase angle. The sinusoidal signals excite the independent precision current source modules, reference voltage circuit signal conditioning modules, and precision voltage transformers in the next stage, to generate independent current components and voltage component driving signals; the current components are directly and parallelly connected and superposed to supply full current output; the current component signals drives the secondary sides of the voltage transformers to be connected parallelly to superpose voltage components to supply reference voltage output. The checking apparatus can achieve highly-accurate check of the main measuring functions of the zinc oxide lightening arrester tester such as measurement of full current, resistance current, capacity current, reference voltage, phase angle, harmonic wave component, etc.
Description
Technical field
The present invention relates to a kind of verifying apparatus for zinc oxide arrester tester, the calibration, calibrating and the detection range that belong to the power test instrument, utilizing this calibration equipment can be that measurement functions such as total current, current in resistance property, capacity current, reference voltage, phase angle, harmonic component carry out the verification of pin-point accuracy to the main measurement function of zinc oxide arrester tester, and each time standard voltage that is produced, normalized current signal all can be synchronously, convenient, effectively carry out magnitude tracing.
Background technology
Along with Zinc-Oxide Arrester is widely used, the security of electric system is greatly improved.But because the Zinc-Oxide Arrester work under bad environment is easy to generate phenomenons such as aging, so Zinc-Oxide Arrester is regularly detected very necessary.In light of this situation, domestic a lot of power test instrument manufacturing firm begins development, produces zinc oxide arrester tester.But according to investigations, the zinc oxide arrester tester quality on the home market is uneven, and this class testing instrument is carried out verification and provides reliable checking data that the quality that improves preventive trial is had positive effect to the user.In " DL/T 987-2005 zinc oxide lightning arrester block property current tester general technical specifications ", explicitly call for measurement functions such as total current to zinc oxide arrester tester, current in resistance property, capacity current to detect.
Known to the applicant, the method for present domestic relevant technologies unit verification zinc oxide arrester tester mainly comprises: traditional RC resistance-capacitance network method and common standard signal source method, deficiency is respectively arranged, make a concrete analysis of as follows:
Wherein, traditional RC resistance-capacitance network method, its principle is: under the excitation of power-frequency voltage (being reference voltage), the current signal (being total current) that configuration generation and reference voltage by resistance-capacitance network has certain phase differential, the reference voltage of generation and total current can be used for zinc oxide arrester tester is carried out verification.The deficiency of this method is: the measuring resistance of using in the loop, standard capacitance are affected by environment bigger, wiring is loaded down with trivial details, complicated operation, influence to measurement result is bigger, and test data is single, and the phase angle problem is difficult for solving, and harmonic voltage that verification work is necessary and harmonic current can't produce, and influenced by test product and cause standard value to change greatly, and then influence is to the calibration result of zinc oxide arrester tester
Wherein, common standard signal source method, its principle is: utilize technology such as electronic circuit, produce standard signal source and promptly directly provide one road reference voltage signal and one tunnel full current signal, in order to zinc oxide arrester tester is carried out verification.Reference voltage and the total current of utilizing this method to produce can realize containing each harmonic voltage and harmonic current components substantially.The deficiency of this method is: only the magnitude tracing of the calibration equipment by the design of this thinking itself is difficult to be guaranteed, during such as the total current of taking common standard signal source method to provide, the amplitude of each harmonic electric current, phase place, parameters such as frequency are difficult to tracing to the source of pin-point accuracy, briefly be exactly to be difficult to be verified, its reason is: these harmonic current components are included in the total current, can only calculating when these components are traced to the source by signal analysis (such as Fourier transform etc.) means " indirectly ", the calculating of this " indirectly " or leaching process can reduce trace to the source result's confidence level of harmonic current components undoubtedly, its result is exactly the very difficult good traceability that guarantees each harmonic current component in the total current of design proposal that causes based on the verifying apparatus for zinc oxide arrester tester of this method, the just amplitude of each harmonic current component, phase place, whether clear hardly frequency is accurately on earth; In like manner, when the reference voltage that provides based on the common standard signal source contained harmonic voltage, parameters such as the amplitude of each harmonic voltage, phase place, frequency were difficult to tracing to the source of pin-point accuracy.
In sum, but at present domestic calibration equipment and method of calibration that can reference all exist not enough on principle of work and traceability, accuracy can not meet the demands, the limits of error of a large amount of zinc oxide arrester tester nominals only reach amplitude measurement 0.5% on the market, about 0.2 ° of measurement of angle, but be badly in need of the verifying apparatus for zinc oxide arrester tester that design has good traceability, high and the verifying apparatus for zinc oxide arrester tester that can effectively be verified of accuracy just satisfies the urgent needs of present verification work.
Summary of the invention
The objective of the invention is at the deficiency on the existing verifying apparatus for zinc oxide arrester tester design concept, especially but the deficiency of calibration equipment on traceability improved, a kind of verifying apparatus for zinc oxide arrester tester is provided, but has good traceability, and improve checking precision.
To achieve these goals, technical solution of the present invention provides a kind of verifying apparatus for zinc oxide arrester tester, by controller, signal generator module, the precision current source module, reference voltage loop signal conditioning module, accurate four-terminal resistance, accurate voltage mutual inductor is formed, it is characterized in that: the output control signal of controller connects the control end of 5 signal generator modules respectively, wherein there is the output of 3 signal generator modules to connect the input of corresponding 3 precision current source modules respectively, 3 precision current source modules are exported corresponding current component by corresponding 3 accurate four-terminal resistances respectively, each current component stack of back in parallel provides total current output, wherein there is the output of 2 signal generator modules to connect the input of corresponding 2 reference voltage loop signal conditioning module respectively, the output of 2 reference voltage loop signal conditioning module is connected with corresponding 2 former limits of accurate voltage mutual inductor respectively, by coupling, the secondary of 2 accurate voltage mutual inductors is exported the correspondent voltage component respectively, and the component of voltage stack provided reference voltage output after the secondary of 2 accurate voltage mutual inductors was in series.
Its principle of work is: under the control action of controller, each signal generator module can produce independently amplitude, frequency, the sinusoidal signal unit that the height that phase angle is adjustable is level and smooth, these sinusoidal signal unit can be to back level precision current source module independently separately, reference voltage loop signal conditioning module, accurate voltage mutual inductor encourages, thereby form separate each primary current component and component of voltage drive signal, and each primary current component is by direct addition in parallel, finally synthetic and output contains the total current of each harmonic component, then by driving the accurate voltage mutual inductor coupling, the final output of its secondary series connection phase adduction contains the reference voltage of each harmonic component to the component of voltage drive signal.
Aforesaid verifying apparatus for zinc oxide arrester tester, it is characterized in that: signal generator module is taked the circuit based on DDS chip AD9951, produces easily with the Direct Digital synthetic technology of DDS chip that frequency stabilization is adjustable, amplitude stability is adjustable, phase stabilization is adjustable and the level and smooth stable sinusoidal signal of height of curve.
Secondly, the present invention has also adopted following core technology in design:
1, the sinusoidal signal generation module of the adjustable and curve smoothing of amplitude, frequency and phase stabilization
In order to reach the verification purpose of pin-point accuracy, at first need to generate some basic sinusoidal signal unit, these sinusoidal signal unit will be used for encouraging rearmounted current source circuit and constant voltage power supply circuit and producing the corresponding standard reference voltage and the standard total current.In order at first to obtain the sinusoidal signal unit of the adjustable and curve smoothing of amplitude and frequency stabilization, having taked the Direct Digital synthetic technology is that the DDS chip produces sinusoidal signal.The Direct Digital synthetic technology is mainly taked more at present in the high-frequency signal field, use also less in field of electrical testing.Its principal feature is based on the Direct Digital blending theory, proposed sinusoidal signal (or any period waveform) the generation way that a kind of frequency can change at a high speed, this technology is used and can be produced easily in the present invention that frequency stabilization is adjustable, amplitude stability is adjustable, phase stabilization is adjustable and the level and smooth stable sinusoidal signal of height of curve.Wherein: the frequency of sinusoidal signal also can be configured to the each harmonic frequency easily except can be the 50Hz first-harmonic, and highly stable; The amplitude resolution of sinusoidal signal can reach 14, satisfies needs of the present invention; Though the more important thing is that the sinusoidal signal curve is still for discretize, but the refresh interval of curve amplitude is less than 1us, very level and smooth, can't see " ladder " by ordinary oscilloscope, the effect of this " height of curve is level and smooth " can be avoided taking follow-up filtering circuit fully, thus the negative effect of amplitude that the filtering circuit that significantly reduces brings and phase place.
2, the mode that " module " changed has been taked in the design of precision current source circuit and reference voltage loop signal modulate circuit
The mode that the present invention has taked " module " to change to the precision current source circuit and the reference voltage loop signal modulate circuit of core in design.The input signal that is each precision current source module or reference voltage loop signal conditioning module is a sinusoidal signal that independence is pure, this signal is the DDS chip from direct digital synthesis circuit, under the excitation of the adjustable sinusoidal signal of amplitude-frequency independently, each precision current source module or reference voltage loop signal conditioning module can be exported different amplitudes respectively, frequency, the electric current of phase place, component of voltage, these electric currents, current component can be used as each component of total current and reference voltage, and each precision current source module has been chosen high performance device, near the infinitely-great ideal current source requirement of output impedance, and characteristics based on the output impedance approach infinity, these precision current source modules can be directly in parallel with synthetic full current signal, reaches the purpose of current summation.Reference voltage loop signal conditioning module is also directly connected and is synthesized the reference voltage signal simultaneously.Change thought based on this " module ", the present invention has formed following characteristics: each primary current component and component of voltage can be drawn respectively in output total current and reference voltage, this mode helps can drawing each primary current component and component of voltage simultaneously as required under the background of output total current and reference voltage when this calibration equipment goes superior unit to trace to the source, just can " synchronously " to the amplitude of any harmonic component, frequency, phase place is traced to the source, improve the result's that traces to the source validity greatly, guaranteed the accuracy of the each harmonic component that this calibration equipment produces.
3, taked accurate voltage mutual inductor in the design of precision voltage source
The present invention has made former limit low pressure, the high-accuracy voltage mutual inductor of secondary high pressure specially when the output reference voltage.Avoided the deficiency of utilizing the high-voltage power amplifier to boost by this way of output.
The invention has the beneficial effects as follows, use this verifying apparatus for zinc oxide arrester tester, can be that measurement functions such as total current, current in resistance property, capacity current, reference voltage, phase angle, harmonic component carry out the verification of pin-point accuracy to the main measurement function of zinc oxide arrester tester, and each time standard voltage that is produced, normalized current signal all can be synchronously, convenient, effectively carry out magnitude tracing.And important feature is that each time voltage, current component all can trace to the source by corresponding loop " synchronously " at synchronization, verifies its accuracy.
Description of drawings
Fig. 1 is traditional verifying apparatus for zinc oxide arrester tester principle schematic based on the standard signal source method.
Fig. 2 is the verifying apparatus for zinc oxide arrester tester theory diagram of the embodiment of the invention.
Fig. 3 .1 is the circuit theory diagrams of Fig. 2 middle controller.
Fig. 3 .2 is the circuit theory diagrams of one road signal generator module among Fig. 2.
Fig. 3 .3 is one road precision current source module circuit theory diagrams among Fig. 2.
Fig. 3 .4 is the circuit theory diagrams of one road reference voltage loop signal conditioning module and accurate voltage mutual inductor among Fig. 2.
Embodiment
The present invention is described further below in conjunction with drawings and Examples.
Mark among the figure: 1-controller, 21,22,23,24,25-signal generator module, 31,32,33-precision current source module, 34,35-reference voltage loop signal conditioning module, 41,42,43-accurate four-terminal resistance, 54,55-accurate voltage mutual inductor, Ia
1, Ia
2, Ia
3-current component, Ua
1, Ua
2-component of voltage, I-total current, U-reference voltage.
Referring to traditional verifying apparatus for zinc oxide arrester tester principle schematic shown in Figure 1, be the circuit diagram of an electricity based on the standard signal source method.Reference voltage U and total current I that it utilizes this calibration equipment to produce can realize containing each harmonic voltage and harmonic current components substantially.The deficiency of this method is: only the magnitude tracing of the calibration equipment by the design of this thinking itself is difficult to be guaranteed, can only be when its component is traced to the source by the calculating of signal analysis (such as Fourier transform etc.) means " indirectly ", the calculating of this " indirectly " or leaching process can reduce trace to the source result's confidence level of harmonic component undoubtedly.
Referring to the verifying apparatus for zinc oxide arrester tester schematic diagram of the embodiment of the invention shown in Figure 2, this is the related circuit of an electricity.The control end that connects signal generator module 21,22,23,24,25 by the output control signal of controller 1, the output of signal generator module 21,22,23 connects the input of corresponding precision current source module 31,32,33 respectively, and the output of precision current source module 31,32,33 produces output current component Ia by accurate four- terminal resistance 41,42,43 respectively
1, Ia
2, Ia
3, stack in parallel back produces total current I output.The output of signal generator module 24,25 connects the input of corresponding reference voltage loop signal conditioning module 34,35 respectively, the output terminal of reference voltage loop signal conditioning module 34,35 is connected with accurate voltage mutual inductor 54,55 former limits respectively, by coupling, accurate voltage mutual inductor 54 secondary produce component of voltage output Ua
1, accurate voltage mutual inductor 55 secondary produce component of voltage output Ua
2, two accurate voltage mutual inductor 54,55 secondary are in series and make each output voltage U a
1, Ua
2Stack provides reference voltage U output.
Its principle of work is: under the control action of controller 1 (being specially single-chip microcomputer C8051F020), each signal generator module 21,22,23,24,25 (realize based on DDS chip AD9951, referring to Fig. 3 .2) can produce independently amplitude, frequency, the sinusoidal signal unit that the height that phase angle is adjustable is level and smooth, these sinusoidal signal unit can be to back level precision current source module 31 independently separately, 32,33 (constitute based on accurate amplifier OPA228 chip, referring to Fig. 3 .3), reference voltage loop signal conditioning module 34,35 (constitute based on precise high-voltage amplifier OPA454 chip, referring to Fig. 3 .4), accurate voltage mutual inductor 54,55 encourage, thereby form each separate primary current component Ia
1, Ia
2, Ia
3With component of voltage Ua
1, Ua
2Drive signal, and each primary current component Ia
1, Ia
2, Ia
3By direct addition in parallel, finally synthetic and output contains the total current I of each harmonic component, and component of voltage Ua
1, Ua
2Drive signal is then by driving the reference voltage U that the final output of accurate voltage mutual inductor 54,55 series connection phase adductions contains the each harmonic component.
In the present embodiment, signal generator module 21,22,23,24,25 has taked Direct Digital synthetic technology based on the DDS chip to produce easily that frequency stabilization is adjustable, amplitude stability is adjustable, phase stabilization is adjustable and the level and smooth stable sinusoidal signal of height of curve.
In the present embodiment, take the mode of " modular superimposition " in design, adopted precision current source module 31,32,33 and reference voltage loop signal conditioning module 34,35.
In the present embodiment, for fear of the deficiency of utilizing the high-voltage power amplifier to boost, in design, taked to export reference voltage by accurate voltage mutual inductor 54,55.
Claims (2)
1, a kind of verifying apparatus for zinc oxide arrester tester, by controller (1), signal generator module (21) (22) (23) (24) (25), precision current source module (31) (32) (33), reference voltage loop signal conditioning module (34) (35), accurate four-terminal resistance (41) (42) (43), accurate voltage mutual inductor (54) (55) is formed, it is characterized in that: the control end that connects signal generator module (21) (22) (23) (24) (25) by the output control signal of controller (1), the output of signal generator module (21) (22) (23) connects the input of corresponding precision current source module (31) (32) (33) respectively, and the output of precision current source module (31) (32) (33) produces output current component Ia by accurate four-terminal resistance (41) (42) (43) respectively
1, Ia
2, Ia
3Stack in parallel back produces total current I output, the output of signal generator module (24) (25) connects the input of corresponding reference voltage loop signal conditioning module (34) (35) respectively, the output terminal of reference voltage loop signal conditioning module (34) (35) is connected with the former limit of accurate voltage mutual inductor (54) (55) respectively, by coupling, accurate voltage mutual inductor (54) secondary produces component of voltage output Ua
1, accurate voltage mutual inductor (55) secondary produces component of voltage output Ua
2, two accurate voltage mutual inductors (54) (55) secondary is in series and makes each output voltage U a
1, Ua
2Stack provides reference voltage U output.
2, verifying apparatus for zinc oxide arrester tester as claimed in claim 1 is characterized in that: signal generator module (21) (22) (23) (24) (25) signal generator module is taked the circuit based on DDS chip AD9951.
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| CN2008101975501A CN101393255B (en) | 2008-11-07 | 2008-11-07 | Verifying apparatus for zinc oxide arrester tester |
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|---|---|---|---|
| CN2008101975501A CN101393255B (en) | 2008-11-07 | 2008-11-07 | Verifying apparatus for zinc oxide arrester tester |
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| CN101393255B CN101393255B (en) | 2012-06-27 |
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