CN203502480U - Isolating high-voltage differential measuring probe - Google Patents
Isolating high-voltage differential measuring probe Download PDFInfo
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- CN203502480U CN203502480U CN201320660696.1U CN201320660696U CN203502480U CN 203502480 U CN203502480 U CN 203502480U CN 201320660696 U CN201320660696 U CN 201320660696U CN 203502480 U CN203502480 U CN 203502480U
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Abstract
The utility model discloses an isolating high-voltage differential measuring probe, which comprises a high-voltage side light emission unit, a low-voltage side light receiving unit, an optical fiber, a positive electrode probe, a negative electrode probe, a positive electrode analog signal output end and a negative electrode analog signal output end, wherein the high-voltage side light emission unit is connected with the low-voltage side light receiving unit through the optical fiber, the high-voltage side light emission unit is provided with the positive electrode probe and the negative electrode probe, and the low-voltage side light receiving unit is provided with the positive electrode analog signal output end and the negative electrode analog signal output end. The isolating high-voltage differential measuring probe has the beneficial effects that: in order to overcome the differential voltage test under a high common-mode voltage, the isolating high-voltage differential measuring probe adopts the high-voltage sampling transmission for carrying out digital modulation on analog signals, and effectively solves the observation problem of the low-frequency differential voltage disturbance under the high common-mode voltage; and the isolating high-voltage differential measuring probe has the advantages of low cost, simple operation, high safety and reliable measurement.
Description
Technical field:
The utility model belongs to electronic applications, relates to and the measurement to differential voltage (in one kilovolt) under the high common mode voltage of electric power (several kilovolts-tens kilovolts), is a kind of differential voltage measuring sonde that coordinates oscillograph to use.
Background technology:
Differential voltage measuring technique under high voltage has at present:
1, traditional differential voltage measuring sonde: the highest common-mode voltage range of oscillograph adapted High Pressure Difference sub-probe, at 1300-2300v, cannot be measured differential voltage more than common mode voltage 5kv at present;
2, high-voltage bleeder: high-voltage bleeder is to utilize high-power capacitance-resistance dividing potential drop, is connected with high-tension measurement end by instrument, realizes high-tension measurement, if the differential voltage under high common mode voltage is measured and will be used two voltage dividers, and the high volume of price is large.
Utility model content:
The deficiency that cannot measure the differential voltage under high common mode voltage (more than 5kv) in order to overcome common differential voltage probe of the present utility model, provides a kind of measuring sonde of measuring the differential voltage under high common mode voltage based on Optical Fiber Transmission; This measuring sonde coordinates testing tool (oscillograph and multimeter etc.) to use, and can measure the differential voltage of 1kv under 10kv-35kv common mode voltage.
The purpose of this utility model solves by the following technical programs:
A kind of isolated high-voltage difference measurement probe, comprises high-pressure side Optical Transmit Unit, low-pressure side light receiving unit, optical fiber, anodal probe, negative pole probe, anodal analog signal output and negative pole analog signal output; Described high-pressure side Optical Transmit Unit is connected by optical fiber with low-pressure side light receiving unit, at high-pressure side Optical Transmit Unit, be provided with anodal probe and negative pole probe, on low-pressure side light receiving unit, be provided with anodal analog signal output and negative pole analog signal output.
Described high-pressure side Optical Transmit Unit comprises Differential input circuit, V/F voltage-frequency converter and the light emission module connecting successively; Differential input circuit, V/F voltage-frequency converter and light emission module are connected with DC/DC module with powered battery module simultaneously.
Described low-pressure side light receiving unit comprises that the Optical Receivers, the F/V that connect successively press converter, ratio to amplify biasing zeroing protection and output module frequently, and Optical Receivers, F/V frequently press converter, ratio to amplify biasing zeroing protection and output module is connected with DC/DC module with powered battery module simultaneously.
The beneficial effects of the utility model are: in order to overcome the differential voltage test under high common mode voltage; this practicality invention has adopted the high pressure sampling transmission of simulating signal being carried out to Digital Modulation; efficiently solve under high common mode voltage the observation of low frequency differences component voltage disturbance; Have advantages of that cost is low, simple to operate, safe, reliable measurements.
Accompanying drawing explanation:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is use principle figure of the present utility model;
Fig. 3-1 is Optical Transmit Unit part-structure figure;
Fig. 3-2 are light receiving unit part-structure figure;
Fig. 3-3 are Power supply part-structure figure;
Wherein: 1 is high-pressure side Optical Transmit Unit; 2 is low-pressure side light receiving unit; 3 is optical fiber; 4 is anodal probe; 5 is negative pole probe; 6 is anodal analog signal output; 7 is negative pole analog signal output; 8 is 10KV high voltage bus; 9 is surveying instrument.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Referring to Fig. 1,2,3-1,3-2,3-3, a kind of isolated high-voltage difference measurement probe, comprises high-pressure side Optical Transmit Unit, low-pressure side light receiving unit, optical fiber, anodal probe, negative pole probe, anodal analog signal output and negative pole analog signal output; Described high-pressure side Optical Transmit Unit is connected by optical fiber with low-pressure side light receiving unit, at high-pressure side Optical Transmit Unit, be provided with anodal probe and negative pole probe, on low-pressure side light receiving unit, be provided with anodal analog signal output and negative pole analog signal output.
Described high-pressure side Optical Transmit Unit comprises Differential input circuit, v/F voltage-frequency converter and the light emission module connecting successively; Differential input circuit, v/F voltage-frequency converter and light emission module are connected with DC/DC module with powered battery module simultaneously.
Described low-pressure side light receiving unit comprises that the Optical Receivers, the F/V that connect successively press converter, ratio to amplify biasing zeroing protection and output module frequently, and Optical Receivers, F/V frequently press converter, ratio to amplify biasing zeroing protection and output module is connected with DC/DC module with powered battery module simultaneously.
Measuring sonde integral body is comprised of 5 places as can be seen from Figure, by optical fiber (can be set to crocus), connects two unit, and box is above high-pressure side Optical Transmit Unit, and box is below low-pressure side receiving element; By optical fiber, they are connected and realize electrical isolation; High-pressure side Optical Transmit Unit, this unit is by two, left side probe, ' just ' is set very red, and ' negative ' be black very, measures High Pressure Difference component voltage and be 1000v to the maximum; By right side optical fiber head, the signal of collection is spread out of by optical fiber;
Low-pressure side light receiving unit, this unit is that optical fiber is inputted by left side, right side is analog signal output; Corresponding output signal is in measuring junction, yellow cable output signal ' just ' the utmost point, blue cable output signal ' negative ' the utmost point, maximum output 10v;
Principle explanation: can be found out by theory diagram, be whole surveying instrument in dotted line frame, and surveying instrument is divided into again two parts, high-tension measurement side and low pressure receiver side, connected its two parts by optical fiber the electrical isolation that has realized high-low pressure; In order to measure the differential voltage on 10kv bus; realize the electrical isolation that high-low pressure is measured; the differential voltage signal of measuring is carried out to electric voltage frequency modulation; the signal of modulation is sent into Optical Fiber Transmission to receiving end; receiving end becomes electric signal by light signal; to F/V, frequency signal is converted to analog voltage signal and is realizing signal gain is amplified and zero correction through simulated modulation circuit, High Pressure Difference divided voltage signal is exported to external instrument the most at last; High-pressure side consists of differential voltage sampling, voltage-frequency converter, Optical Transmit Unit as can be seen from Figure, by optical fiber, do electrical isolation, low-pressure side receiving optical signals by frequency pressure converter become simulating signal, again by amplifier, form that zero offset regulates and the final outputting analog signal of gain-adjusted to oscillograph.
The aerial lug that High Pressure Difference component voltage is undertaken by JP1 port is measured, it is 2M ohm that JP1 end adopts high-voltage conducting wires and sampling with high precision resistance input, the proportional difference attenuator circuit forming through prime U1a operational amplifier is by 100 times of 1000v voltage signal decay, differential attenuation multiple: K=(R33+R35+R37+R1)/R4, make 1000v signal become 10v voltage signal, this signal is supplied with respectively to U5 amplifier formation voltage comparator setting comparative voltage control light emitting diode D1 and can realize overvoltage protection demonstration, alarm voltage threshold threshold value can be adjusted R39 by attenuation multiple, R40, this circuit threshold value is 1000v protection voltage, another road signal amplifies conditioning through U1b, and U1B is one-level homophase operational amplifier, and its gain is adjusted into K=1+R7/R5, gain K>=1, deliver to that U2 forms
f changes into numerical frequency signal by voltage, its output frequency is f=V1n*12k/2.09*100k*6.8k*0.01u, its frequency signal drives U4 to transfer light signal to through Q1 and sends, so far high-pressure side transmitter unit just converts analog voltage signal to light signal and sends, low-pressure side light receiving part U6 receiving optical signals, its Voltage-output of frequency-voltage conversion circuit that is bonded to U7 formation by C19 lotus root is Vout=fin*2.09*6.8k*0.01u*100k/ (12.1k+5k), digital conditioned signal is reduced into simulating signal, through U3, form signal condition, simulating signal is carried out to the selection of ratio gain amplifier and school zero fine setting, final output signal is to terminal JP2, and VD2 is output interface over-voltage protector TVS, power pack is to supply with respectively being exported and be transformed into positive and negative 15v through DC/DC by battery of Optical Transmit Unit and light receiving unit by battery, its power is respectively 0.65VV (transmitting) 0.53VV (reception),
Testing procedure
1. connect tested differential electrical pressure side: high-tension measurement probe is connect as tested high-pressure side, transmitter module is connected by optical fiber with receiver module.Note, please will be apart from pulling open (guaranteeing high-voltage electrical apparatus safe insulation distance) by optical fiber by transmitter module and receiver module;
2. connect surveying instrument opening power: will export measurement terminal lead-in wire access surveying instrument (take oscillograph as example); access oscillograph ordinary ultrasonic probe 10x; by oscilloprobe multiple debugging 1000x, (now High Pressure Difference sub-probe decay 100x, ordinary ultrasonic probe decay 10x);
3. now going up main electricity is the tested differential voltage of Observable;
Characterisitic parameter explanation:
Differential mode voltage measurement range: DC1000v;
Attenuation ratio: 1000v:10v (100x); / 100v:10v (10x);
Common-mode isolation voltage range: according to fiber lengths 0-50kv;
Analog bandwidth: 0-5KHz;
Precision:
The linearity: < 0.2%
Step response time: 170us;
Step response time delay: 30us;
Difference-mode input internal resistance: 2M ohm;
Power consumption: 0.65VV (transmitting) 0.53VV (reception);
Power supply supply mode: built-in rechargeable battery;
Operating voltage: DC4.5V-9v;
Working method: voltage-frequency/frequency is pressed conversion;
Frequency of operation: 100k;
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the method for above-mentioned announcement and technology contents to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, still belong in the scope of technical solution of the present invention.
Claims (3)
1. an isolated high-voltage difference measurement probe, is characterized in that: comprise high-pressure side Optical Transmit Unit, low-pressure side light receiving unit, optical fiber, anodal probe, negative pole probe, anodal analog signal output and negative pole analog signal output; Described high-pressure side Optical Transmit Unit is connected by optical fiber with low-pressure side light receiving unit, at high-pressure side Optical Transmit Unit, be provided with anodal probe and negative pole probe, on low-pressure side light receiving unit, be provided with anodal analog signal output and negative pole analog signal output.
2. isolated high-voltage difference measurement is popped one's head in as claimed in claim 1, it is characterized in that: described high-pressure side Optical Transmit Unit comprises Differential input circuit, V/F voltage-frequency converter and the light emission module connecting successively; Differential input circuit, V/F voltage-frequency converter and light emission module are connected with DC/DC module with powered battery module simultaneously.
3. isolated high-voltage difference measurement is popped one's head in as claimed in claim 1; it is characterized in that: described low-pressure side light receiving unit comprises that the Optical Receivers, the F/V that connect successively press converter, ratio to amplify biasing zeroing protection and output module frequently, and Optical Receivers, F/V frequently press converter, ratio to amplify biasing zeroing protection and output module is connected with DC/DC module with powered battery module simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320660696.1U CN203502480U (en) | 2013-10-24 | 2013-10-24 | Isolating high-voltage differential measuring probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320660696.1U CN203502480U (en) | 2013-10-24 | 2013-10-24 | Isolating high-voltage differential measuring probe |
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| CN203502480U true CN203502480U (en) | 2014-03-26 |
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| CN201320660696.1U Expired - Fee Related CN203502480U (en) | 2013-10-24 | 2013-10-24 | Isolating high-voltage differential measuring probe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259400A (en) * | 2015-10-20 | 2016-01-20 | 西北核技术研究所 | Z-pinch hoop wire array load voltage measuring apparatus and method |
| CN106199113A (en) * | 2016-08-29 | 2016-12-07 | 山东大学（威海） | A kind of active High Pressure Difference sub-probe device |
| CN109061281A (en) * | 2018-09-25 | 2018-12-21 | 珠海格力电器股份有限公司 | Common-mode voltage conversion circuit and chip system |
| CN109374947A (en) * | 2018-09-27 | 2019-02-22 | 南瑞集团有限公司 | It is a kind of not by the electric system high voltage measuring system of electromagnetic interference influence |
| US11549973B1 (en) | 2021-08-26 | 2023-01-10 | Keysight Technologies, Inc. | System for measuring voltage using pulse width modulator or voltage controlled oscillator |
-
2013
- 2013-10-24 CN CN201320660696.1U patent/CN203502480U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259400A (en) * | 2015-10-20 | 2016-01-20 | 西北核技术研究所 | Z-pinch hoop wire array load voltage measuring apparatus and method |
| CN105259400B (en) * | 2015-10-20 | 2018-01-19 | 西北核技术研究所 | A kind of Z hoop fibre arrays load voltage measurement apparatus and method |
| CN106199113A (en) * | 2016-08-29 | 2016-12-07 | 山东大学（威海） | A kind of active High Pressure Difference sub-probe device |
| CN106199113B (en) * | 2016-08-29 | 2019-02-15 | 山东大学（威海） | A kind of active high pressure differential probe device |
| CN109061281A (en) * | 2018-09-25 | 2018-12-21 | 珠海格力电器股份有限公司 | Common-mode voltage conversion circuit and chip system |
| CN109374947A (en) * | 2018-09-27 | 2019-02-22 | 南瑞集团有限公司 | It is a kind of not by the electric system high voltage measuring system of electromagnetic interference influence |
| US11549973B1 (en) | 2021-08-26 | 2023-01-10 | Keysight Technologies, Inc. | System for measuring voltage using pulse width modulator or voltage controlled oscillator |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20211024 |
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| CF01 | Termination of patent right due to non-payment of annual fee |