CN201615928U - High-voltage dielectric loss testing device - Google Patents
High-voltage dielectric loss testing device Download PDFInfo
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- CN201615928U CN201615928U CN2010201681549U CN201020168154U CN201615928U CN 201615928 U CN201615928 U CN 201615928U CN 2010201681549 U CN2010201681549 U CN 2010201681549U CN 201020168154 U CN201020168154 U CN 201020168154U CN 201615928 U CN201615928 U CN 201615928U
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Abstract
The utility model relates to a high-voltage dielectric loss testing device, in particular to a testing device, which comprises a sine wave output variable-frequency power source capable of outputting power of 0-300V and 40-70Hz, a booster device, a high-voltage standard capacitor, a non-grounded testing device, a high-voltage current sampling isolating unit, a dielectric loss measuring unit, a grounded tested device and a display control unit, wherein the booster device is used for boosting voltage and connected with the sine wave output variable-frequency power source, the high-voltage standard capacitor, the non-grounded testing device and the high-voltage current sampling isolating unit are parallelly connected mutually and respectively connected with the booster device, the dielectric loss measuring unit is simultaneously connected with the high-voltage standard capacitor, a non-grounded tested device and the high-voltage current sampling isolating unit and used for amplifying, filtering, synchronously sampling, calculating and processing signals to be tested, the grounded tested device is connected with the high-voltage current sampling isolating unit, and the display control unit is respectively connected with the dielectric loss measuring unit and the sine wave output variable-frequency power source and used for controlling operational commands of users and displaying measured results. By adopting the above structure, the high-voltage dielectric loss testing device can have functions of testing dielectric loss via positive/negative connection.
Description
[technical field]
The utility model relates to a kind of proving installation, particularly a kind of high-pressure medium loss test device that power equipment is carried out the high-pressure medium loss measurement.
[background technology]
For operation conditions and the installation quality of checking power equipment, guarantee that power equipment safety normally moves, in commissioning test, preventive trial and the maintenance process of engineering, all will carry out the measurement of high-pressure medium loss, so the high-pressure medium loss test is a kind of important measures that guarantee power equipment transportation, installation, repair quality and safe operation.
At present because the limitation of high voltage isolation techniques, usually the dielectric loss test under rated voltage can only be adopted positive connection to the ground connection test product, field apparatus must be opened the ground connection disconnecting link like this, bring loaded down with trivial details and insecurity to execute-in-place, when in addition power generator being carried out large repairs, all to do the dielectric loss test to generator unit stator, testing crew need carry out suspended core with generator, carry out the test of positive connection dielectric loss then, need lot of manpower and material resources like this and prolonged duration of whole overhaul engineering.The dielectric loss tester that a small amount of can just realization the/reversal connection test is also arranged on the market, but this dielectric loss tester can only just realized under the following voltage of 10kV/the reversal connection test, surpass the 10kV trial voltage and promptly can't carry out the reversal connection test, therefore, when doing the high voltage dielectric loss test above the 10kV trial voltage, usually can only do positive wiring and measure, make a lot of at the scene grounding apparatuss can't do the dielectric loss test under the rated voltage.
Therefore, be necessary to invent a kind of new high-pressure medium loss test device, to overcome above-mentioned defective.
[utility model content]
The purpose of this utility model provides a kind ofly can just possessed/reversal connection line function simultaneously, and can satisfy the high-pressure medium loss test device of the above high-tension apparatus of 10kV.
For achieving the above object, the technical solution of the utility model is: a kind of high-pressure medium loss test device, and it comprises: one can export 0-300V, the sinewave output variable-frequency power sources of 40-70Hz; One increasing apparatus in order to boost and to be connected with the sinewave output variable-frequency power sources; Be connected with increasing apparatus respectively and high voltage standard capacitor parallel with one another, non-earthing test equipment and high-tension current sampling isolated location, is connected simultaneously with described high voltage standard capacitor, the tested equipment of non-ground connection and high-tension current sampling isolated location and to tested side signal amplify, the dielectric loss measurement unit of filtering, synchronized sampling, computing, with the high-tension current tested equipment of ground connection that isolated location is connected of taking a sample; One be connected with dielectric loss measurement unit and sinewave output variable-frequency power sources respectively with control user's operational order and show measurement result indicative control unit.
Wherein said increasing apparatus adopts testing transformer or series resonance mode to boost.
Wherein said high voltage standard capacitor SF6 gas-insulated, electric capacity are 50pF or 100pF.
Be provided with standard side current sampling and amplifying circuit between wherein said high voltage standard capacitor and dielectric loss measurement unit, be provided with tested side-draw sample of positive wiring and amplifying circuit between tested equipment of described non-ground connection and dielectric loss measurement unit, positive tested side-draw sample of wiring and amplifying circuit are identical with standard side current sampling and big circuit.
Wherein said high-tension current sampling isolated location comprises: the current sampling device of receiving inputted signal, the programmable amplifier that is connected with current sampling device, the modulator that is connected with programmable amplifier, the optical fiber emitter that is connected with modulator, respectively with current sampling device, control amplifier, modulator is connected and respectively sample resistance is switched to current sampling device, range switches to the single-chip microcomputer that programmable amplifier, carrier signal are passed to modulator, the optical fiber sending and receiving injection device that is connected with single-chip microcomputer.
Be provided with between wherein said high-tension current sampling isolated location and dielectric loss measurement unit the tested side signal of reversal connection line is input to optical fiber receiving signal demodulation circuit in the dielectric loss measurement unit after modulation, optical fiber isolation.
Wherein said high-tension current sampling isolated location adopts the chargeable lithium cell power supply.
Because adopt said structure, the high-pressure medium loss test device of the utility model has following beneficial effect:
1. (more than the 10KV) can just possess/reversal connection line function simultaneously under the high voltage
The high-pressure medium loss test device of the utility model is owing to be provided with high-tension current sampling isolated location, realized high-pressure side test product current signal being taken a sample, being modulated and isolate the function that is sent to low-pressure side, made that the high-pressure medium loss test device of the utility model can just possess simultaneously/function of reversal connection line tested media loss.
2. adopt the series resonance mode to boost, realize the jamproof purpose of frequency conversion
The high-pressure medium loss test device of the utility model is by adopting sinewave output variable-frequency power sources power supply, output voltage is adjustable continuously, the power supply output frequency can the power frequency scope (adjustable continuously in 40～70Hz), be convenient to adopt the series resonance mode to boost, also can realize the jamproof purpose of frequency conversion.
[description of drawings]
Fig. 1 is the test macro synoptic diagram of the utility model high-pressure medium loss test device;
Fig. 2 is the standard side current sampling circuit schematic diagram of the utility model high-pressure medium loss test device;
Fig. 3 is the standard side signal amplification circuit schematic diagram of the utility model high-pressure medium loss test device;
Fig. 4 is the tested side signal demodulating circuit of the reversal connection line schematic diagram of the utility model high-pressure medium loss test device;
Fig. 5 is the tested side low pass signal of the reversal connection line amplifying circuit schematic diagram of the utility model high-pressure medium loss test device;
Fig. 6 is the circuit theory diagrams of the dielectric loss measurement unit of the utility model high-pressure medium loss test device;
Fig. 7 is the high-tension current sampling isolated location schematic block circuit diagram of the utility model high-pressure medium loss test device.
[embodiment]
Below in conjunction with drawings and Examples the utility model high-pressure medium loss test device is further described.
Please refer to shown in Figure 1ly, the utility model high-pressure medium loss test device comprises high-pressure medium loss test device, and it comprises: one can export 0-300V, the sinewave output variable-frequency power sources of 40-70Hz; One increasing apparatus in order to boost and to be connected with the sinewave output variable-frequency power sources; Be connected with increasing apparatus respectively and high voltage standard capacitor parallel with one another, non-earthing test equipment and high-tension current sampling isolated location, is connected simultaneously with described high voltage standard capacitor, the tested equipment of non-ground connection and high-tension current sampling isolated location and to tested side signal amplify, the dielectric loss measurement unit of filtering, synchronized sampling, computing, with the high-tension current tested equipment of ground connection that isolated location is connected of taking a sample; One be connected with dielectric loss measurement unit and sinewave output variable-frequency power sources respectively with control user's operational order and show measurement result indicative control unit.
Wherein sinewave output variable-frequency power sources is used to produce the experiment power supply of test needs.Electric power output voltage is adjustable continuously, the power supply output frequency can the power frequency scope (adjustable continuously in 40～70Hz), be convenient to adopt the series resonance mode to boost, also can realize the jamproof purpose of frequency conversion.This partial circuit is realized the function of voltage regulation and frequency modulation by the instruction of serial line interface reception from indicative control unit.What be used for variable-frequency power sources output is sine-wave power, so can directly adopt testing transformer to boost, also can join excitation change and reactor outward and carry out resonance step-up, selects flexibly according to the requirement of test capacity.Usually the low capacity test product can adopt the testing transformer mode to boost, and the high capacity test product can adopt the series resonance mode to boost, and helps improving power-efficient.
High voltage standard capacitor adopts the SF6 gas-insulated, and dielectric loss is very little, and electric capacity is very stable, can require to select for use the high voltage standard capacitor of different rated voltages according to the highest trial voltage of system, and electric capacity can be selected 50pF or 100pF.
The dielectric loss measurement unit finish to standard side current signal, the positive tested side signal of wiring, the tested side signal of reversal connection line amplify, processing such as filtering, synchronized sampling, calculating, obtain the electric capacity and the dielectric loss value of test specimen.
Be provided with standard side current sampling (as shown in Figure 2) and amplifying circuit (as shown in Figure 3) between described high voltage standard capacitor and dielectric loss measurement unit, be provided with tested side-draw sample of positive wiring and amplifying circuit between tested equipment of described non-ground connection and dielectric loss measurement unit, positive tested side-draw sample of wiring and amplifying circuit are identical with standard side current sampling and big circuit.
Among Fig. 2, R260, R261, R262 are current sampling circuit among standard side (Cn) the current sample partial circuit figure, according to size of current, switch different sample resistances by relay R L204 and RL205.TVS201, L201, D209～D212, C258, C259 are the shock resistance holding circuit.U229 is a double operational, finishes the signal impedance conversion and puts in advance.
Among Fig. 3, signal is imported and is delivered to AD converter (band AD converter in the microprocessor) after programmable amplifier shown in Figure 3 amplifies.
Be provided with between described high-tension current sampling isolated location and dielectric loss measurement unit the tested side signal of reversal connection line is input to optical fiber receiving signal demodulation circuit (as shown in Figure 4) in the dielectric loss measurement unit after modulation, optical fiber isolation.The signal of the tested side of reversal connection line (Cx2) signal after ovennodulation, optical fiber are isolated is input to measuring unit, and amplifier U231A carries out shaping to the signal from the optical fiber receiving end among Fig. 4, carries out the fixed ampllitude shaping by U232 again, by the output of U231B buffering.The low pass amplifying circuit of map interlinking 5, the filtering high-frequency modulation signal restores on high-tension side current signal.
As shown in Figure 7, described high-tension current sampling isolated location comprises: the current sampling device of receiving inputted signal, the programmable amplifier that is connected with current sampling device, the modulator that is connected with programmable amplifier, the optical fiber emitter that is connected with modulator, respectively with current sampling device, control amplifier, modulator is connected and respectively sample resistance is switched to current sampling device, range switches to the single-chip microcomputer that programmable amplifier, carrier signal are passed to modulator, the optical fiber sending and receiving injection device that is connected with single-chip microcomputer.
The high voltage side current signal is at first amplified in advance by current sampling circuit, and by the size of single-chip microcomputer according to signal magnitude switching sample resistance, the sample circuit principle is identical with Fig. 2.Further amplified by programmable amplifier then, circuit theory is identical with Fig. 3, modulates with the carrier signal that single-chip microcomputer produces through the signal after amplifying again, and the square-wave pulse after the modulation is sent to the low pressure measurement unit through the optical fiber emitting head.Realized high-pressure side test product current signal taken a sample, modulates and isolated the function that is sent to low-pressure side.Because this partial circuit is in high-pressure side, so adopted the chargeable lithium cell power supply, has solved the electrical isolation between the high-low pressure.
As shown in Figure 6, Un, Ux1, Ux2 are respectively the standard side, signal after positive tested side of wiring and the tested side of reversal connection line are amplified through sampling, finish level shift by U216, U217, U218 operational amplifier respectively, U213, U214, U215 are three tunnel signals sampling retainers, what adopt is the integrated sampling holder of LF198, and three tunnel sampled signals have guaranteed the synchronized sampling of three road signals like this by same signal controlling.Here C8051F120 has been adopted in little processing, has been with 8 tunnel 12 bit A/D converters in it, the RAM of 8K, and clock can reach 100MHz, is adapted at doing high-speed data here and handles.At first microprocessor carries out the synchronous high-speed sampling to three road signals, then every circuit-switched data is carried out fast Flourier (FFT) computing, obtain amplitude and phase relation under the signal frequency, than the electric capacity that can calculate test specimen, the tangent value of phase differential is the dielectric loss value by amplitude.All computings are finished by microprocessor, and measurement result accurately and reliably.By serial line interface measurement result is sent to indicative control unit output at last.
The utility model high-pressure medium loss test device can possess positive wiring method of testing testing high voltage dielectric loss simultaneously, also can use reversal connection wire testing method testing high voltage dielectric loss.
Described positive wiring method of testing may further comprise the steps: by the indicative control unit input instruction, indicative control unit is connected with the sinewave output variable-frequency power sources, the sinewave output variable-frequency power sources is according to the voltage signal of instruction output characteristic frequency, voltage is after increasing apparatus boosts, high pressure is applied to the high-pressure side of tested equipment of non-ground connection and high voltage standard capacitor, tested equipment of non-ground connection and high voltage standard capacitor low-pressure side current signal are connected respectively to the standard signal input and the tested signal input part of dielectric loss measurement unit, and the dielectric loss measurement unit amplifies standard side and tested side signal respectively, filtering, synchronized sampling, show measurement result by indicative control unit after the computing.
Described reversal connection wire testing method may further comprise the steps: by the indicative control unit input instruction, indicative control unit is connected with the sinewave output variable-frequency power sources, the sinewave output variable-frequency power sources is according to the electric current of instruction output specific voltage frequency, electric current is after increasing apparatus boosts, another road of high-pressure side that high pressure is applied to standard capacitance is added to the high-pressure side of ground connection test specimen after through high-tension current sampling isolated location, high pressure standard capacitance low-pressure side current signal is input to the standard channel signal of dielectric loss measurement unit, the high-tension current sampling unit is with the detected current signal that flows through the ground connection test specimen, through high frequency modulated, the optical fiber isolation is sent to dielectric loss measurement unit reversal connection signal input port, undertaken obtaining on high-tension side current signal after the demodulation by the dielectric loss measurement unit, carry out synchronized sampling with the current signal of standard side, show measurement result by indicative control unit after the computing.
Claims (7)
1. high-pressure medium loss test device is characterized in that it comprises:
One can export 0-300V, the sinewave output variable-frequency power sources of 40-70Hz;
One increasing apparatus in order to boost and to be connected with the sinewave output variable-frequency power sources;
Be connected with increasing apparatus respectively and high voltage standard capacitor parallel with one another, non-earthing test equipment and high-tension current sampling isolated location, is connected simultaneously with described high voltage standard capacitor, the tested equipment of non-ground connection and high-tension current sampling isolated location and to tested side signal amplify, the dielectric loss measurement unit of filtering, synchronized sampling, computing, with the high-tension current tested equipment of ground connection that isolated location is connected of taking a sample;
One be connected with dielectric loss measurement unit and sinewave output variable-frequency power sources respectively with control user's operational order and show measurement result indicative control unit.
2. high-pressure medium loss test device as claimed in claim 1 is characterized in that: described increasing apparatus adopts testing transformer or series resonance mode to boost.
3. high-pressure medium loss test device as claimed in claim 1 is characterized in that: described high voltage standard capacitor SF6 gas-insulated, electric capacity are 50pF or 100pF.
4. high-pressure medium loss test device as claimed in claim 1, it is characterized in that: be provided with standard side current sampling and amplifying circuit between described high voltage standard capacitor and dielectric loss measurement unit, be provided with tested side-draw sample of positive wiring and amplifying circuit between tested equipment of described non-ground connection and dielectric loss measurement unit, positive tested side-draw sample of wiring and amplifying circuit are identical with standard side current sampling and big circuit.
5. high-pressure medium loss test device as claimed in claim 1, it is characterized in that: described high-tension current sampling isolated location comprises: the current sampling device of receiving inputted signal, the programmable amplifier that is connected with current sampling device, the modulator that is connected with programmable amplifier, the optical fiber emitter that is connected with modulator, respectively with current sampling device, the control amplifier, modulator connects and respectively sample resistance is switched to current sampling device, range switches to programmable amplifier, carrier signal is passed to the single-chip microcomputer of modulator, the optical fiber sending and receiving injection device that is connected with single-chip microcomputer.
6. high-pressure medium loss test device as claimed in claim 5 is characterized in that: be provided with between described high-tension current sampling isolated location and dielectric loss measurement unit the tested side signal of reversal connection line is input to optical fiber receiving signal demodulation circuit in the dielectric loss measurement unit after modulation, optical fiber isolation.
7. high-pressure medium loss test device as claimed in claim 5 is characterized in that: described high-tension current sampling isolated location adopts the chargeable lithium cell power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201681549U CN201615928U (en) | 2009-12-11 | 2010-03-27 | High-voltage dielectric loss testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200920212924 | 2009-12-11 | ||
| CN200920212924.2 | 2009-12-11 | ||
| CN2010201681549U CN201615928U (en) | 2009-12-11 | 2010-03-27 | High-voltage dielectric loss testing device |
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| CN201615928U true CN201615928U (en) | 2010-10-27 |
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| CN2010201681549U Expired - Fee Related CN201615928U (en) | 2009-12-11 | 2010-03-27 | High-voltage dielectric loss testing device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941208A (en) * | 2014-03-31 | 2014-07-23 | 国家电网公司 | Method and device for calibrating high-voltage charged display |
| CN103983859A (en) * | 2014-06-03 | 2014-08-13 | 国家电网公司 | Transformer dielectric loss and capacitance on-line measurement device |
| CN104267264A (en) * | 2014-09-16 | 2015-01-07 | 国家电网公司 | Transformer insulation oil dielectric loss and electrical resistivity automatic detecting system |
| CN107942275A (en) * | 2017-12-13 | 2018-04-20 | 中国航空工业集团公司成都飞机设计研究所 | One kind excitation cuts mode numerical control capacitive load analog circuit |
| CN114740293A (en) * | 2022-04-02 | 2022-07-12 | 中汽研新能源汽车检验中心(天津)有限公司 | Device for testing transient immunity of low-voltage output port of automobile DC-DC converter |
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2010
- 2010-03-27 CN CN2010201681549U patent/CN201615928U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941208A (en) * | 2014-03-31 | 2014-07-23 | 国家电网公司 | Method and device for calibrating high-voltage charged display |
| CN103941208B (en) * | 2014-03-31 | 2017-01-18 | 国家电网公司 | Method and device for calibrating high-voltage charged display |
| CN103983859A (en) * | 2014-06-03 | 2014-08-13 | 国家电网公司 | Transformer dielectric loss and capacitance on-line measurement device |
| CN104267264A (en) * | 2014-09-16 | 2015-01-07 | 国家电网公司 | Transformer insulation oil dielectric loss and electrical resistivity automatic detecting system |
| CN104267264B (en) * | 2014-09-16 | 2017-02-01 | 国家电网公司 | Transformer insulation oil dielectric loss and electrical resistivity automatic detecting system |
| CN107942275A (en) * | 2017-12-13 | 2018-04-20 | 中国航空工业集团公司成都飞机设计研究所 | One kind excitation cuts mode numerical control capacitive load analog circuit |
| CN114740293A (en) * | 2022-04-02 | 2022-07-12 | 中汽研新能源汽车检验中心(天津)有限公司 | Device for testing transient immunity of low-voltage output port of automobile DC-DC converter |
| CN114740293B (en) * | 2022-04-02 | 2024-03-12 | 中汽研新能源汽车检验中心(天津)有限公司 | Automobile DC-DC converter low-voltage output port transient immunity testing device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101027 Termination date: 20130327 |