CN102062848A - Calibrating device of output voltage of insulating oil dielectric strength tester - Google Patents
Calibrating device of output voltage of insulating oil dielectric strength tester Download PDFInfo
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- CN102062848A CN102062848A CN2010105748167A CN201010574816A CN102062848A CN 102062848 A CN102062848 A CN 102062848A CN 2010105748167 A CN2010105748167 A CN 2010105748167A CN 201010574816 A CN201010574816 A CN 201010574816A CN 102062848 A CN102062848 A CN 102062848A
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- output voltage
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Abstract
The invention discloses a calibrating device of the output voltage of an insulating oil dielectric strength tester, which comprises a base and a high-voltage interface unit of an insulating oil dielectric strength tester, wherein the high-voltage interface unit is connected with the input end of a double-high voltage resistance voltage divider through a high-voltage lead; the output end of the double-high voltage resistance voltage divider is connected with a differential amplification unit arranged in the base; a data acquisition unit which is connected with the differential amplification unit is arranged in the base; the data acquisition unit is connected with a data processing unit; and the display output end of the data processing unit is connected with a display unit. The calibrating device can be conveniently connected to the output end of the calibrated insulating oil dielectric strength tester, is used for simulating the practical load of the insulating oil dielectric strength tester, measuring an output voltage value of the calibrated insulating oil dielectric strength tester once, as well as calibrating the characteristics of the output voltage of the insulating oil dielectric strength tester and can ensure that the insulating oil dielectric strength tester conveniently subject to measurement traceability.
Description
Technical field
The invention belongs to the high-tension apparatus technical field of measurement and test, relate to the calibrating installation in the High-Voltage Insulation testing apparatus, especially a kind of calibrating installation of insulating oil withstand voltage tester output voltage
Background technology
The withstand voltage test of insulating oil is important tests in national compulsory authentication and the electric system, and insulating oil withstand voltage tester is the major equipment of this test.For in the quality that guarantees insulating oil withstand voltage tester and the use accurately, reliable, this class testing instrument is carried out rationally, effectively calibrates and be very important.Domestic most of manufacturers have all adopted principle of work mode as shown in Figure 1 at present, find out thus in the inside of withstand voltage instrument and formed a high-pressure system by two high-tension transformers, the high pressure sampling of tester then is to sample in the input port of transformer, the line data of going forward side by side is handled, and makes display voltage value and high-pressure side output voltage proportional.This principle of work can reduce greatly withstand voltage instrument profile and weight, be easy to carry, but brought some following problems too:
1. two transformer T
1And T
2Power be not very big, most of producers about 2mA, so the load-carrying ability of transformer institute is very limited, will consider the load that is brought of calibrating installation with Current Control during calibration.
2. the generation of operating voltage is by two transformer T
1And T
2Each produces the voltage addition of phase differential 180 degree forms, and existing calibration steps is to measure two transformer T respectively
1And T
2Output voltage, if algebraic sum addition then is T
1And T
2The phase differential of voltage is spent less than 180 or is surpassed, and just might make the voltage of such measurement and virtual voltage have error.
3. insulating oil withstand voltage tester need regularly carry out period regulation, does not have the special test device at present.
In order to address the above problem, this patent is the isolated plant of calibrating and detecting at the insulating oil withstand voltage tester of present China main flow.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of calibrating installation that is convenient for measuring the output voltage of insulating oil withstand voltage tester is provided, this calibrating installation can conveniently be connected to by the output terminal of school insulating oil withstand voltage tester, the actual loading of analog insulation oil Hi-pot Tester, one-shot measurement is by the output voltage values of school insulating oil withstand voltage tester.Be used to calibrate the characteristic of the output voltage of insulating oil withstand voltage tester, can make it conveniently carry out magnitude tracing.
The objective of the invention is to solve by the following technical programs:
The calibrating installation of this insulating oil withstand voltage tester output voltage, the high voltage interface unit that comprises base and insulating oil withstand voltage tester, described high voltage interface unit is connected with the input end of two high-tension resistive voltage dividers by high-voltage connection, and the output terminal of described pair of high-tension resistive voltage divider is connected with the difference amplifying unit of being located in the base; Be provided with the data acquisition unit that is connected with the difference amplifying unit in the described base, described data acquisition unit is connected with data processing unit, and the demonstration output terminal of described data processing unit is connected with display unit.
Above-mentioned pair of high-tension resistive voltage divider is made up of high-voltage arm and low-voltage arm, and each free two resistive elements series connection of described high-voltage arm and low-voltage arm constitutes, and an end of high-voltage arm and low-voltage arm is connected back ground connection; Be parallel with a quick overvoltage protection device on the resistive element of the earth terminal of described high-voltage arm and low-voltage arm respectively.
The resistive element of the high and low pressure arm of above-mentioned pair of high-tension resistive voltage divider is selected the resistor of same material for use.
Above-mentioned resistive element adopts noninductive winding.
High-voltage connection between above-mentioned high voltage interface unit and the two high-tension resistive voltage divider is provided with insulating coating.
Above-mentioned base is the metallic shield body.
The high-voltage arm of above-mentioned pair of high-tension resistive voltage divider and low-voltage arm adopt the High-Voltage Insulation lead-in wire to be connected respectively with between the high voltage interface unit.
The present invention has following beneficial effect:
1) the present invention adopts two high-tension resistive voltage dividers can once finish the measurement of insulating oil withstand voltage tester output voltage, substitutes traditional difference measuring transformer T
1And T
2Output voltage carry out the method for algebraic sum again, solved T
1And T
2The inaccurate problem of measurement that the phase differential of voltage brings less than 180 degree or when surpassing.
2) the present invention is installed in difference input block 6, data acquisition unit 7, data processing unit 8, display unit 9 set in the base, has both reduced volume, and the maskable outside electromagnetic interference improves Low-voltage Electronic antijamming capability partly again.And this all unit are gathered together by base and high-voltage connection, make easy to carry, neat.
Description of drawings
Fig. 1 is the structure principle chart of insulating oil withstand voltage tester;
Fig. 2 is the structural representation of the calibrating installation of insulating oil withstand voltage tester output voltage;
Fig. 3 is two high-tension resistive bleeder circuit schematic diagrams;
Fig. 4 is difference input-cell circuitry schematic diagram and low pressure end electrical diagram;
Fig. 5 is the high-tension connector structural representation.
Among the figure: T
1, T
2Be high-tension transformer; 1 is the high voltage interface unit; 2 is high-voltage connection; 3, the 4 high and low pressure arms that are respectively two high-tension resistive voltage dividers; 5 is base; 6 is differential amplifier circuit; 7 is data acquisition unit; 8 is data processing unit; 9 is display unit; R
1, R
3Be respectively the high-voltage arm of two high-voltage bleeders; R
2, R
4Be respectively the low-voltage arm of two high-voltage bleeders; u
I1, u
I2Be respectively the secondary output voltage of voltage divider; TVS is an overvoltage protection device; 10 is high-tension connector; 11 for connecting slotting spring.
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 2, the calibrating installation of insulating oil withstand voltage tester output voltage of the present invention, comprise base 5 and high voltage interface unit 1, wherein high voltage interface unit 1 is connected with the input end of two high-tension resistive voltage dividers by high-voltage connection 2, and the output terminal of two high-tension resistive voltage dividers is connected with the differential amplifier circuit of being located in the base 56; Be provided with the data acquisition unit 7 that is connected with differential amplifier circuit 6 in the base 5, data acquisition unit 7 is connected with data processing unit 8, and the demonstration output terminal of data processing unit is connected with display unit 9.
Concrete annexation of the present invention is as follows:
On base 5, fix two high-tension resistive voltage dividers, high voltage interface unit 1 by flange, connect with high-voltage connection 2 between high voltage interface unit 1 and the two high-tension resistive voltage divider with insulating coating, promptly the high-voltage arm 3 of two high-tension resistive voltage dividers and low-voltage arm 4 adopt High-Voltage Insulation lead-in wire 2 to be connected respectively with between the high voltage interface unit 1, realize the transformer T of insulating oil withstand voltage tester
1And T
2And being electrically connected between two high-tension resistive voltage dividers, thereby reach two high-tension resistive voltage divider sampling transformer T
1And T
2The purpose of output voltage signal.Differential amplifier circuit 6 of the present invention, data acquisition unit 7, data processing unit 8, display unit 9 set are installed in the base 5, and base 5 is the metallic shield body, and the maskable outside electromagnetic interference improves Low-voltage Electronic antijamming capability partly.With reference to Fig. 5, high-voltage connection 2 of the present invention is combined with high-tension connector 10, be high-voltage connection 2 with high voltage interface unit 1 between adopt high-tension connector 10 to be connected, on the insulating oil withstand voltage tester output terminal, plug when the slotting spring 11 on the end of high-tension connector 10 is convenient to test, make test convenient.
Referring to Fig. 3, of the present invention pair of high-tension resistive voltage divider is made up of high-voltage arm 3 and low-voltage arm 4, and high-voltage arm 3 and low-voltage arm 4 each free two resistive elements series connection constitute, and an end of high-voltage arm and low-voltage arm is connected back ground connection; Be parallel with a quick overvoltage protection device TVS on the resistive element of the earth terminal of high-voltage arm 3 and low-voltage arm 4 respectively, the amplitude that this quick overvoltage protection device TVS can over-voltage helps protecting differential amplifier circuit 6 and subsequent conditioning circuit.The resistive element of the high and low pressure arm 3,4 of this pair high-tension resistive voltage divider of the present invention is selected the resistor of same material for use, make voltage divider have comparatively stable temperature coefficients, select the resistive element of stable low-temperature coefficient, low inductance simultaneously, this resistive element adopts noninductive winding, inductance value is lower, guarantees that voltage divider has pin-point accuracy.
Principle of work of the present invention is as follows:
Referring to Fig. 3 and Fig. 4, the secondary output voltage u of of the present invention pair of high-tension resistive voltage divider
I1And u
I2In the input difference amplifying circuit 6, differential amplifier circuit 6 is with two tested voltage signal u
I1And u
I2Synthesize an output voltage signal u
0, differential amplifier circuit 6 utilizes the symmetry and the negative feedback of circuit parameter, stablizes quiescent point effectively, is notable feature to amplify difference mode signal inhibition common-mode signal, so elect it input stage of metering circuit as.Voltage signal u
0Change digital quantity output into through data acquisition unit 7, this digital quantity is exported the correlation parameters such as effective value that calculate the high pressure output voltage through data processing unit 8, shows by display unit 9 again.
In sum, the height pressure arm resistance of of the present invention pair of high-tension resistive voltage divider is selected the resistor of same material for use, make voltage divider have comparatively stable temperature coefficients, select the resistive element of stable low-temperature coefficient, low inductance simultaneously, this resistive element adopts noninductive winding, inductance value is lower, guarantees that voltage divider has pin-point accuracy.The present invention adopts high-tension connector and test specimen to carry out plug-in to be connected, and connects more convenient when making test.
Claims (9)
1. the calibrating installation of an insulating oil withstand voltage tester output voltage, comprise base (5) and high voltage interface unit (1), it is characterized in that: described high voltage interface unit (1) is connected with the input end of two high-tension resistive voltage dividers by high-voltage connection (2), and the output terminal of described pair of high-tension resistive voltage divider is connected with the differential amplifier circuit of being located in the base (5) (6); Be provided with the data acquisition unit (7) that is connected with differential amplifier circuit (6) in the described base (5), described data acquisition unit (7) is connected with data processing unit (8), and the demonstration output terminal of described data processing unit is connected with display unit (9).
2. the calibrating installation of insulating oil withstand voltage tester output voltage according to claim 1, it is characterized in that: described pair of high-tension resistive voltage divider is made up of high-voltage arm (3) and low-voltage arm (4), each free two resistive elements series connection of described high-voltage arm and low-voltage arm constitutes, and an end of high-voltage arm and low-voltage arm is connected back ground connection; Be parallel with a quick overvoltage protection device (TVS) on the resistive element of the earth terminal of described high-voltage arm and low-voltage arm respectively.
3. the calibrating installation of insulating oil withstand voltage tester output voltage according to claim 1 and 2 is characterized in that: the resistive element of the high and low pressure arm of described pair of high-tension resistive voltage divider is selected the resistor of same material for use.
4. the calibrating installation of insulating oil withstand voltage tester output voltage according to claim 1 and 2 is characterized in that: described resistive element adopts noninductive winding.
5. the calibrating installation of insulating oil withstand voltage tester output voltage according to claim 1 is characterized in that: described data processing unit (8) adopts integrated DPS chip microprocessor.
6. the calibrating installation of insulating oil withstand voltage tester output voltage according to claim 1 is characterized in that: described data acquisition unit adopts 16 multi-channel data acquisition devices.
7. the calibrating installation of insulating oil withstand voltage tester output voltage according to claim 1 is characterized in that: the high-voltage connection (2) between described high voltage interface unit (1) and the two high-tension resistive voltage divider is provided with insulating coating.
8. the calibrating installation of insulating oil withstand voltage tester output voltage according to claim 1 is characterized in that: described base (5) is the metallic shield body.
9. the calibrating installation of insulating oil withstand voltage tester output voltage according to claim 1 is characterized in that: high-voltage arm of described pair of high-tension resistive voltage divider (3) and low-voltage arm (4) adopt High-Voltage Insulation lead-in wire (2) to be connected respectively with between high voltage interface unit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105748167A CN102062848A (en) | 2010-12-06 | 2010-12-06 | Calibrating device of output voltage of insulating oil dielectric strength tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105748167A CN102062848A (en) | 2010-12-06 | 2010-12-06 | Calibrating device of output voltage of insulating oil dielectric strength tester |
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|---|---|
| CN102062848A true CN102062848A (en) | 2011-05-18 |
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|---|---|---|---|
| CN2010105748167A Pending CN102062848A (en) | 2010-12-06 | 2010-12-06 | Calibrating device of output voltage of insulating oil dielectric strength tester |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426325A (en) * | 2011-09-15 | 2012-04-25 | 西安交通大学 | Testing arrangement of oil paper insulation frequency domain spectrum |
| CN103869225A (en) * | 2014-03-14 | 2014-06-18 | 国家电网公司 | Portable suspension insulator voltage insulation test system and voltage insulation test method thereof |
| CN104678268A (en) * | 2015-03-06 | 2015-06-03 | 云南电网有限责任公司电力科学研究院 | 500 kV high-voltage parallel reactor turn-to-turn insulating state evaluating system |
| CN106707217A (en) * | 2017-02-17 | 2017-05-24 | 新疆维吾尔自治区计量测试研究院 | Integrated wireless control calibrating device for insulating oil dielectric strength tester |
| CN111566490A (en) * | 2019-07-23 | 2020-08-21 | 深圳欣锐科技股份有限公司 | Insulation detection circuit, mainboard and relevant device |
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| CN2779413Y (en) * | 2004-05-31 | 2006-05-10 | 綦南供电局 | Online monitoring apparatus for overvoltage of 10KV power system |
| CN201083823Y (en) * | 2007-10-26 | 2008-07-09 | 国网武汉高压研究院 | Insulating oil dielectric strength tester vector measurement dedicated calibration apparatus |
| CN201335860Y (en) * | 2008-12-31 | 2009-10-28 | 浙江省电力试验研究院 | Calibrating device for insulating oil breakdown voltage tester |
| CN201387462Y (en) * | 2009-05-11 | 2010-01-20 | 武汉特试特电气有限公司 | Device for verifying dielectric strength testing instrument of insulated oil |
| CN201527467U (en) * | 2009-07-16 | 2010-07-14 | 福建省普华电子科技有限公司 | Insulating oil voltage-withstanding tester calibrating device |
-
2010
- 2010-12-06 CN CN2010105748167A patent/CN102062848A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2779413Y (en) * | 2004-05-31 | 2006-05-10 | 綦南供电局 | Online monitoring apparatus for overvoltage of 10KV power system |
| CN201083823Y (en) * | 2007-10-26 | 2008-07-09 | 国网武汉高压研究院 | Insulating oil dielectric strength tester vector measurement dedicated calibration apparatus |
| CN201335860Y (en) * | 2008-12-31 | 2009-10-28 | 浙江省电力试验研究院 | Calibrating device for insulating oil breakdown voltage tester |
| CN201387462Y (en) * | 2009-05-11 | 2010-01-20 | 武汉特试特电气有限公司 | Device for verifying dielectric strength testing instrument of insulated oil |
| CN201527467U (en) * | 2009-07-16 | 2010-07-14 | 福建省普华电子科技有限公司 | Insulating oil voltage-withstanding tester calibrating device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426325A (en) * | 2011-09-15 | 2012-04-25 | 西安交通大学 | Testing arrangement of oil paper insulation frequency domain spectrum |
| CN103869225A (en) * | 2014-03-14 | 2014-06-18 | 国家电网公司 | Portable suspension insulator voltage insulation test system and voltage insulation test method thereof |
| CN104678268A (en) * | 2015-03-06 | 2015-06-03 | 云南电网有限责任公司电力科学研究院 | 500 kV high-voltage parallel reactor turn-to-turn insulating state evaluating system |
| CN106707217A (en) * | 2017-02-17 | 2017-05-24 | 新疆维吾尔自治区计量测试研究院 | Integrated wireless control calibrating device for insulating oil dielectric strength tester |
| CN111566490A (en) * | 2019-07-23 | 2020-08-21 | 深圳欣锐科技股份有限公司 | Insulation detection circuit, mainboard and relevant device |
| CN111566490B (en) * | 2019-07-23 | 2022-07-05 | 深圳欣锐科技股份有限公司 | Insulation detection circuit, mainboard and relevant device |
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Application publication date: 20110518 |