CN1058653A - Automatic voltmeter with digital double-display - Google Patents

Automatic voltmeter with digital double-display Download PDF

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Publication number
CN1058653A
CN1058653A CN 90105187 CN90105187A CN1058653A CN 1058653 A CN1058653 A CN 1058653A CN 90105187 CN90105187 CN 90105187 CN 90105187 A CN90105187 A CN 90105187A CN 1058653 A CN1058653 A CN 1058653A
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resistance
switch
termination
connect
phase
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CN 90105187
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Chinese (zh)
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王中放
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SHENYANG TRANSFORMER FACTORY
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SHENYANG TRANSFORMER FACTORY
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Abstract

The present invention is a kind of automatic voltmeter with digital double-display, belong to instrument and meter, the present invention is connect to follow by attenuator 1 to amplify isolator 2, follow amplification isolator 2 and connect peak value sampling retainer 3, peak value sampling retainer 3 is connected to imitates converter 4, and converter 4 connects isolator 5, isolator 5 connects effective value display digit table 6, peak value display digit table 7, sensor 8 connect filtering and amplify derailing switch 9, control two digital watch and form this voltage table.
It is big that the present invention has test specification, the outstanding advantage of measuring accuracy height, a tractor serves several purposes.

Description

Automatic voltmeter with digital double-display
The present invention relates to the two discharge values of remaining valid automatically that show of a kind of numeral, peak-reading voltmeter is Insulation Test and the high pressure monitoring system measuring instrumentation that is applicable in the physics electrical measurement that high voltage electric appliance exchanges at 50H～400H.Belong to instrument and meter.
Present such instrument of using, it is the crest voltage that (capacitive divider or resitstance voltage divider etc.) measure high-potting under the high-voltage bleeder condition of a kind of fixed partial pressure ratio of adapted, its formation is an and input attenuator of design different by input voltage height, the high-voltage bleeder of supporting a kind of fixed partial pressure ratio (only can) and a digital indicator is only arranged.Its weak point is:
1, can only peak value display or only show effective value at synchronization.
2, during peak value measurement, displayed value be still peak value/
Figure 90105187X_IMG2
, therefore inaccurate promptly divided by the wave mode factor of sinusoidal voltage to the measurement displayed value of non-sinusoidal voltage or asymmetric wave mode voltage, can not provide accurately comprehensively science data to the design studies personnel of high die pressing product.
3, use face is narrow, and utilization factor is low, the failure rate height.
The voltage peak in the automatic maintenance ball utmost point discharge breakdown moment when 4, not having ball disruptive discharge and the function of effective value.
The objective of the invention is to avoid the weak point of above-mentioned existing product and provide a kind of numeral two discharge values of remaining valid automatically, voltage tables of peak value of showing.
The present invention is achieved through the following technical measures: cooperated many intrinsic standoff ratios attenuator 1, followed and amplify isolator 2, peak value sampling retainer 3, AC/DC effective value converter 4, isolator 5, effective value display digit table 6, peak value display digit table 7, sensor 8, filtering and amplify derailing switch 9 and form by multirange.Attenuator 1 can be fit to and the voltage divider of the various intrinsic standoff ratios of adapted and the voltage transformer (VT) and the H.V. step up transformer of various no-load voltage ratios, and simultaneously, attenuator 1 can directly be imported 5KV or 10KV voltage, and this table shows that number is consistent with the actual high-voltage value.Attenuator 1 is by K 1, K 2, R 1～R 9Deng composition.Work as K 1When switch is put 1 position, resistance R 3, R 6～R 9Be composed in series a cover intrinsic standoff ratio, work as K 1When switch is placed 3,4 positions, R 5With R 6～R 9Be composed in series a cover intrinsic standoff ratio.K 2Be the range selector under the various intrinsic standoff ratios.R 1, R 2For directly importing 5KV or one group of attenuator of 10KV, R 10Be the voltage dependent resistor (VDR) in parallel, not damaged by overvoltage with the protection instrument with attenuator 1.Following amplification isolator 2 follows signal amplification and isolates 3 pairs of sampled peak of peak value sampling retainer, positive peak or the maintenance of negative peak voltage sample with the back level.AC/DC effective value converter 4 is converted to direct current signal with AC signal.Isolator 5 is isolated.Two digital voltmeter 6 ' (M are arranged respectively at last 1), 7(M 2) show the effective value and the peak value of measurement result.By attenuator 1V 0Output signal is through R 11Enter Ic 1In-phase end, output signal is through R 14Feed back to Ic 1End of oppisite phase is followed the amplification isolator with formation.Ic 1Output signal through R 12, R 13The series connection dividing potential drop is after R 16Enter Ic 2Inverting input, by D 2Detection, signal is through R 19Enter Ic 3In-phase end, R 21With Ic 3Output feeds back to Ic 3End of oppisite phase, output table 6(M 1) formation effective value metering circuit.Ic 1Output signal through R 22To Ic 4In-phase end, through K switch 3Change positive and negative through D 3Detection, C 2Peak value keeps, through R 23To Ic 5In-phase end, output table 7(M 2) the positive negative peak of demonstration measuring voltage.Electromagnetic signal when the disruptive discharge of the ball utmost point is received through filtering amplification derailing switch 9 by sensor 8 two digital watch, 6,7 displayed values is held simultaneously.The electricity of sensing element Q induction, magnetic, acoustical signal are through R 25, C 4, C 5Filtering, C 6Coupling is through R 27To Ic 6End of oppisite phase amplifies, R 28For feedback resistance, output signal through R 29Enter Ic 7Through D 4, D 5Detection, C 9The Tr switch triode is isolated in coupling, succeeds electrical equipment J 1Adhesive, J 1, J 2After the closure, with M 1, M 2The maintenance end H voltage of table is zero.Displayed value is held, K 4Be the hand control maintained switch, K 5Be to eliminate the hold mode switch.
The present invention has that measurement range is big, measuring accuracy is high, use is reliable, the advantage of a-table-multi-purpose.
Now in conjunction with the accompanying drawings the present invention is described in further detail.
Fig. 1 is the present invention's electricity functional-block diagram.
Fig. 2～4th, electrical schematic diagram of the present invention.
Fig. 1～4th, the specific embodiment of the invention.Amplify isolator 2 and be connected with following by many intrinsic standoff ratios attenuator 1, follow and amplify isolator 2 and peak value sampling retainer 3, effective value converter 4 connects, peak value sampling retainer 3, effective value converter 4 is connected with isolator 5, and isolator 5 is connected with effective value display digit table 6, peak value display digit table 7.Electromagnetic sensor 8, filtering are amplified derailing switch 9 and are connected with table 6,7.
Attenuator 1 is by K switch 1, K 2, resistance R 1～R 9Form.Resistance R 1With R 2Series connection, R 1With R 2Between node place and K switch 1Connect resistance R 3Two termination K switch 11 position.Resistance R 4Two termination K switch 12 positions, resistance R 5Two termination K switch 13The position.Resistance R 6, R 7, R 8, R 9Series connection and K switch 1Connect K switch 21 position and resistance R 8, R 9Between node connect K switch 22 positions and resistance R 7, R 8Between the node place connect K switch 23 positions and resistance R 6, R 7Between node connect.Resistance R 10With the attenuator resistance R 3～R 9In parallel.Attenuator 1 and the resistance R of following amplification isolator 2 11Connect R 11Meet Ic 1In-phase end, capacitor C 1One end and R 11Connect C 1Other end ground connection, R 14One end and Ic 1Output terminal connects, the other end and R 15One end, Ic 1End of oppisite phase connects.Resistance R 15Other end ground connection.Resistance R 12With R 13Series connection, R 12One end ground connection, R 13With Ic 1Output terminal connects, resistance R 16One terminating resistor R 12, R 13Between node, R 16Another termination Ic 2End of oppisite phase, resistance R 18One termination Ic 2In-phase end, other end ground connection.Diode D 1One termination Ic 2End of oppisite phase, a termination Ic 2Output terminal, diode D 2One termination Ic 2Output terminal, other end connecting resistance R 19Resistance R 17One end and Ic 2End of oppisite phase connects, the other end and diode D 2One end connects.Resistance R 19Meet Ic 3In-phase end, resistance R 20One termination Ic 3In-phase end, other end ground connection.Resistance R 21One termination Ic 3End of oppisite phase, another termination Ic 3Output terminal, capacitor C 3One termination effective value table 6(M 1) and Ic 3Output terminal, other end ground connection.Constitute the effective value metering circuit.Resistance R 22With Ic 4In-phase end connects, Ic 4Output termination K switch 3, capacitor C 2One termination K 31 position, capacitor C 2With resistance R 24Back one end in parallel and Ic 4End of oppisite phase connects, other end ground connection.Resistance R 23One end and K switch 3, capacitor C 2, resistance R 24Connect the other end and Ic 5In-phase end connects, Ic 5Output termination peak value display digit table 7(M 2) connect.Form the peak value measurement circuit.
Sensing element Q and capacitor C 4Back one terminating resistor R in parallel 25, other end ground connection.R 25Other end connecting resistance R 26, capacitor C 5, capacitor C 5Other end ground connection.Resistance R 26The other end and capacitor C 6Series connection, capacitor C 6Other end connecting resistance R 27, R 27Another termination Ic 6End of oppisite phase, resistance R 30One termination Ic 6In-phase end, other end ground connection.Feedback resistance R 28One termination Ic 6Output terminal, another termination Ic 6End of oppisite phase.Resistance R 29One termination Ic 6Output terminal, another termination Ic 7In-phase end.Capacitor C 7Meet Ic 7End of oppisite phase, other end ground connection.Resistance R 31One termination Ic 7Output terminal, another termination Ic7 end of oppisite phase.Capacitor C 9One termination Ic 7Output terminal, another terminating diode D 4, D 5, diode D 4Another termination capacitor C 8, resistance R 32, capacitor C 8, resistance R 32Ground connection.Diode D 5Other end connecting resistance R 33, resistance R 33Other end ground connection.Switch triode Tr base stage connects capacitor C 9, triode Tr emitter connecting resistance R 35, resistance R 35Other end ground connection.Triode Tr collector connecting relay J.Another termination K switch of relay J 5Diode D 6One termination transistor collector, diode D 6Another termination K switch 5

Claims (1)

1, a kind of automatic voltmeter with digital double-display is characterized in that the resistance R of attenuator 1 1With R 2Series connection, R 1With R 2Between node place and K switch 1Connect resistance R 3Two termination K switch 11 position, resistance R 5Two termination K switch 13 positions, resistance R 6, R 7, R 8, R 9Series connection and K switch 1Connect K switch 21 position and resistance R 8, R 9Between node connect K switch 22 positions and resistance R 7, R 8Between the node place connect K switch 23 positions and resistance R 6, R 7Between node connect resistance R 10With attenuator 1, resistance R 3～R 9Parallel connection, attenuator 1 and the resistance R of following amplification isolator 2 11Connect R 11Meet Ic 1In-phase end, resistance R 14One end and Ic 1Output terminal connects, the other end and R 15One end, Ic 1End of oppisite phase connects, R 13With Ic 1Output terminal connects, resistance R 16One terminating resistor R 12, R 13Between node, R 16Another termination Ic 2End of oppisite phase, diode D 2One termination Ic 2Output terminal, other end connecting resistance R 19, resistance R 19Another termination Ic 3In-phase end, Ic 3Output terminal connects effective value display digit table 6 and forms effective value metering circuit, resistance R 22With Ic 4In-phase end connects, Ic 4Output termination K switch 3, resistance R 23One termination K switch 3, capacitor C 2, resistance R 24, another termination Ic 5In-phase end, Ic 5Output termination peak value display digit table 7 is formed the peak value measurement circuit, sensing element Q and capacitor C 4Back one terminating resistor R in parallel 25, other end ground connection.Resistance R 25Connecting resistance R 26, capacitor C 5, capacitor C 6Connecting resistance R 27, R 27Meet Ic 6End of oppisite phase, Ic6 output terminal connecting resistance R 29, R 29Meet Ic 7In-phase end, Ic 7Output termination capacitor C 9, C 9Another termination switch triode Tr base stage, triode Tr emitter connecting resistance R 35, R 35Other end ground connection.Triode Tr collector connecting relay J, another termination K switch of current-collector J 5
CN 90105187 1990-08-03 1990-08-03 Automatic voltmeter with digital double-display Pending CN1058653A (en)

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Application Number Priority Date Filing Date Title
CN 90105187 CN1058653A (en) 1990-08-03 1990-08-03 Automatic voltmeter with digital double-display

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Application Number Priority Date Filing Date Title
CN 90105187 CN1058653A (en) 1990-08-03 1990-08-03 Automatic voltmeter with digital double-display

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CN1058653A true CN1058653A (en) 1992-02-12

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103630731A (en) * 2013-12-09 2014-03-12 广东电网公司电力科学研究院 Leakage current sampling device and leakage current sampling method
CN103698593A (en) * 2013-12-27 2014-04-02 黑龙江大学 Multi-sensor sensing effect display method and display system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103630731A (en) * 2013-12-09 2014-03-12 广东电网公司电力科学研究院 Leakage current sampling device and leakage current sampling method
CN103698593A (en) * 2013-12-27 2014-04-02 黑龙江大学 Multi-sensor sensing effect display method and display system

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