CN204116535U - Transformer oil alternating current-direct current breakdown voltage measuring instrument - Google Patents
Transformer oil alternating current-direct current breakdown voltage measuring instrument Download PDFInfo
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- CN204116535U CN204116535U CN201420593202.7U CN201420593202U CN204116535U CN 204116535 U CN204116535 U CN 204116535U CN 201420593202 U CN201420593202 U CN 201420593202U CN 204116535 U CN204116535 U CN 204116535U
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- transformer
- alternating current
- cup
- direct current
- measuring instrument
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- 230000015556 catabolic process Effects 0.000 title claims abstract description 57
- 239000011521 glass Substances 0.000 claims description 37
- 238000003756 stirring Methods 0.000 claims description 10
- 238000009422 external insulation Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 20
- 230000005540 biological transmission Effects 0.000 description 7
- 230000005684 electric field Effects 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Abstract
A transformer oil alternating current-direct current breakdown voltage measuring instrument comprises: a box body; the first alternating current transformer is arranged in the box body; the second alternating current transformer is arranged in the box body in parallel with the first alternating current transformer; the two ends of the electrode cup are respectively connected with the first alternating current transformer and the second alternating current transformer; and the electromagnetic stirrer is arranged below the electrode cup and is positioned between the first alternating current transformer and the second alternating current transformer. The utility model discloses the accessible is polyphone the rectifier respectively on two ac transformer and is realized alternating current-direct current voltage output, adopts the mode that two high voltage power supply docks the electrode cup, can obtain the basis of the same voltage level on the electrode on, reduces high voltage power supply external insulation's requirement by a wide margin to reduce the volume of instrument.
Description
Technical field
The utility model relates to a kind of high voltage and insulation technology, particularly a kind of transformer oil alternating current-direct current voltage breakdown measuring instrument for the test and appraisal of converter power transformer insulating property.
Background technology
Along with west-to-east power transmission, north and south supply mutually, the enforcement of on national network engineering, China's electrical network enters fast-developing period, and high pressure and extra-high voltage direct-current transmission meet one of gordian technique that this transmission of electricity requires.
In recent years, China has in succession built up expensive-wide ± 500kV and cloud-wide and to engineerings such as-upper ± 800kV extra-high voltage direct-current transmissions, has fermented at present and building Xinjiang accurate east-Chongqing Sichuan ± 1100kV extra-high voltage direct-current transmission engineering.In DC transmission engineering, converter power transformer is the nucleus equipment of DC transmission system, and its principle of work is that net side alternating current is converted into valve side alternating current by converter power transformer, is transmit after direct current through converter valve rectification.In operation, converter power transformer is except will bearing alternating voltage, lightning impulse and switching overvoltage, with AC transformer difference, also to bear direct current, exchange the effect of superposition DC voltage, therefore as the transformer oil of predominating insulation in converter power transformer except carrying out under AC field except electrical performance test, performance test is worn in the resistance also should carried out under DC electric field, alternating current-direct current superposition of electric field condition.
Due to the singularity of DC voltage, make it have higher requirement to oil-paper combination insulation system, also make the withstand voltage experiment of high voltage direct current become one of most effectual way of examination converter power transformer depressor insulating property.At present, voltage breakdown evaluation both at home and abroad for converter power transformer insulating oil is all carried out on ac breakdown voltage testing tool, and the assessment method that existing ac breakdown voltage testing tool performs mainly contains GB/T507, DL/T421.9, IEC156, ASTM D877, ASTMD1816 etc.
The breakdown voltage of transformer oil assessment method of above-mentioned prior art, all adopt similar principle, namely under the AC field of regulation, adopt ball symmetry electrode or dull and stereotyped symmetry electrode, boost with certain rate of pressure rise, when oil product punctures, stop boosting and recording now magnitude of voltage, as the voltage breakdown of oil product.Do not evaluate the equipment of converter power transformer oil breakdown voltage at a dc voltage.
At present, have a kind of for insulating material alternating current-direct current voltage-withstand test instrument, the voltage-withstand test of insulating material can only be used for, can not be used for puncturing test.Its principle be employing single transformer as AC power, rectifier that platform single transformer is contacted can provide DC voltage, a termination high-voltage power supply on trial target, other end ground connection.The defect of this mode is under identical electric pressure, needs space insulation and surface insulation distance very greatly, causes equipment volume huge.
For the deficiency of the breakdown voltage of transformer oil evaluation instrument of prior art.How a kind of state of development being applicable to current converter power transformer oil is provided, breakdown voltage of transformer oil can be evaluated under AC field, the equipment of breakdown voltage of transformer oil can be evaluated again under DC electric field, and the volume of instrument significantly can be reduced under identical electric pressure, become this area problem demanding prompt solution.
Utility model content
Technical problem to be solved in the utility model is the defect for above-mentioned prior art, a kind of transformer oil alternating current-direct current voltage breakdown measuring instrument being applicable to current converter power transformer oil is provided, breakdown voltage of transformer oil can be evaluated under AC field, breakdown voltage of transformer oil can be evaluated under DC electric field again, and under identical electric pressure, there is less volume.
To achieve these goals, the utility model provides a kind of transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, comprising:
Casing;
First AC transformer, is arranged in described casing;
Second AC transformer, is set in parallel in described casing with described first AC transformer;
Pole cup, two ends are connected with described first AC transformer and described second AC transformer respectively;
Magnetic stirrer, is arranged on the below of described pole cup, and between described first AC transformer and described second AC transformer.
Above-mentioned transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, described pole cup comprises:
One glass cup;
Two bushings, the symmetrical two ends being arranged on described glass cup respectively, one end of described two bushings, and coaxially arrange with described glass cup;
Two band milscale sleeve pipes, are connected with the other end of described two bushings respectively;
Two electrodes, one end of described two electrodes is oppositely arranged in described glass cup, and the other end of described two electrodes is each passed through described glass cup and is connected with described band milscale sleeve pipe with bushing;
Magnetic stir bar, is placed in described glass cup.
Above-mentioned transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, described first AC transformer is connected with the described band milscale sleeve pipe of described pole cup one end by positive polarity rectifier, and described second AC transformer is connected with the described band milscale sleeve pipe of the described pole cup other end by negative polarity rectifier.
Above-mentioned transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, described first AC transformer is directly connected with the described band milscale sleeve pipe of described pole cup one end, and described second AC transformer is directly connected with the described band milscale sleeve pipe of the described pole cup other end.
Above-mentioned transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, also comprises system controller, is arranged on described casing, and described system controller is connected with described first AC transformer, described second AC transformer and described magnetic stirrer respectively.
In order to realize above-mentioned purpose better, the utility model additionally provides a kind of transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, comprising:
Casing;
First AC transformer, is arranged in described casing;
Second AC transformer, is set in parallel in described casing with described first AC transformer;
Two High voltage output ports, are symmetricly set on described casing, and described two High voltage output ports are connected with described first AC transformer and the second AC transformer respectively;
High/low temperature constant temperature humidity chamber, is arranged on above described casing;
Pole cup, is arranged in described high/low temperature constant temperature humidity chamber, and the two ends of described pole cup are connected with described two High voltage output ports respectively;
Magnetic stirrer, is arranged on the below of described pole cup, and between described first AC transformer and described second AC transformer.
Above-mentioned transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, described pole cup comprises:
One glass cup;
Two bushings, the symmetrical two ends being arranged on described glass cup respectively, one end of described two bushings, and coaxially arrange with described glass cup;
Two band milscale sleeve pipes, its one end is connected with the other end of described two bushings respectively;
Two electrodes, one end of described two electrodes is oppositely arranged in described glass cup, and the other end of described two electrodes is each passed through described glass cup and is connected with the sleeve pipe of bushing with described band milscale;
Magnetic stir bar, is placed in described glass cup.
Above-mentioned transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, described first AC transformer is connected with one of described two High voltage output ports by positive polarity rectifier, described second AC transformer is connected with High voltage output port described in another by negative polarity rectifier, and the other end of described two band milscale sleeve pipes is connected with described two High voltage output ports respectively.
Above-mentioned transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, described first AC transformer is directly connected with one of described two High voltage output ports, described second AC transformer is directly connected with High voltage output port described in another, and the other end of described two band milscale sleeve pipes is connected with described two High voltage output ports respectively.
Above-mentioned transformer oil alternating current-direct current voltage breakdown measuring instrument, wherein, also comprise system controller, be arranged on described casing, described system controller is connected with described first AC transformer, described second AC transformer, described magnetic stirrer and described high/low temperature constant temperature humidity chamber respectively.
Beneficial functional of the present utility model is:
Realize combined-voltage by rectifier of contacting respectively in two AC transformer to export, two high-voltage power supplies are adopted to be docked to the mode of pole cup, can obtain on electrode on the basis of identical electric pressure, significantly reduce the requirement of high-voltage power supply external insulation, thus reduce the volume of instrument.And instrument preparation high-voltage output end, easily realizes high-voltage power supply and exports outward, be used in the testing research of breakdown voltage of transformer oil under condition of different temperatures.The utility model can evaluate breakdown voltage of transformer oil under AC field, can evaluate breakdown voltage of transformer oil again, and significantly reduce the volume of equipment under DC electric field under identical electric pressure.
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail, but not as to restriction of the present utility model.
Accompanying drawing explanation
Fig. 1 is the transformer oil alternating current-direct current voltage breakdown measuring instrument structural representation (test of high-voltage alternating voltage breakdown) of the utility model one embodiment;
Fig. 2 is the transformer oil alternating current-direct current voltage breakdown measuring instrument structural representation (test of high voltage direct current voltage breakdown) of the utility model one embodiment;
Fig. 3 is transformer oil alternating current-direct current voltage breakdown measuring instrument structural representation (High AC voltage exports test outward) of another embodiment of the utility model;
Fig. 4 is transformer oil alternating current-direct current voltage breakdown measuring instrument structural representation (high-voltage dc voltage exports test outward) of another embodiment of the utility model;
Fig. 5 is the pole cup structural representation of the utility model one embodiment.
Wherein, Reference numeral
1 first AC transformer
2 positive polarity rectifiers
3 pole cups
4 High voltage output ports
5 system controllers
6 negative polarity rectifiers
7 magnetic stirrers
8 second AC transformer
9 glass cups
10 electrodes
11 magnetic stir bars
12 bushings
13 band milscale sleeve pipes
14 high/low temperature constant temperature humidity chambers
15 casings
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and principle of work are described in detail:
See Fig. 1 and Fig. 2, Fig. 1 is the transformer oil alternating current-direct current voltage breakdown measuring instrument structural representation (test of high-voltage alternating voltage breakdown) of the utility model one embodiment, and Fig. 2 is the transformer oil alternating current-direct current voltage breakdown measuring instrument structural representation (test of high voltage direct current voltage breakdown) of the utility model one embodiment.Transformer oil alternating current-direct current voltage breakdown measuring instrument of the present utility model, comprising:
Casing 15;
First AC transformer 1, is arranged in described casing 15;
Second AC transformer 8, is set in parallel in described casing 15 with described first AC transformer 1;
Pole cup 3, two ends are connected with described first AC transformer 1 and described second AC transformer 8 respectively;
Magnetic stirrer 7, is arranged on the below of described pole cup 3, and between described first AC transformer 1 and described second AC transformer 8.
See the pole cup structural representation that Fig. 5, Fig. 5 are the utility model one embodiment.In the present embodiment, described pole cup 3 comprises:
One glass cup 9;
Two bushings 12, the symmetrical two ends being arranged on described glass cup 9 respectively, one end of described two bushings 12, and coaxially arrange with described glass cup 9;
Two band milscale sleeve pipes 13, are connected with the other end of described two bushings 12 respectively;
Two electrodes 10, one end of described two electrodes 10 is oppositely arranged in described glass cup 9, and the other end of described two electrodes 10 is each passed through described glass cup 9 and is connected with described band milscale sleeve pipe 13 with bushing 12;
Magnetic stir bar 11, is placed in described glass cup 9.
See Fig. 1, under ac breakdown voltage test pattern, described first AC transformer 1 is directly connected with the described band milscale sleeve pipe 13 of described pole cup 3 one end, and described second AC transformer 8 is directly connected with the described band milscale sleeve pipe 13 of described pole cup 3 other end.
See Fig. 2, under DC breakdown voltage testing mode, described first AC transformer 1 is connected with the described band milscale sleeve pipe 13 of described pole cup 3 one end by positive polarity rectifier 2, and described second AC transformer 8 is connected with the described band milscale sleeve pipe 13 of described pole cup 3 other end by negative polarity rectifier 6.
In the present embodiment, also comprise system controller 5, on the sidewall being arranged on described casing 15 or other suitable places, described system controller 5 is connected with described first AC transformer 1, described second AC transformer 8 and magnetic stirrer respectively.System controller 5 is by polygon control survey First AC transformer and the rate of pressure rise of second AC transformer, the stir speed (S.S.) of magnetic stirrer, and magnitude of voltage when record punctures.System controller 5 also can realize above-mentioned control by wireless telecommunications connected mode.
See Fig. 3 and Fig. 4, Fig. 3 is transformer oil alternating current-direct current voltage breakdown measuring instrument structural representation (High AC voltage exports test outward) of another embodiment of the utility model, and Fig. 4 is transformer oil alternating current-direct current voltage breakdown measuring instrument structural representation (high-voltage dc voltage exports test outward) of another embodiment of the utility model.In the present embodiment, this transformer oil alternating current-direct current voltage breakdown measuring instrument comprises:
Casing 15;
Two High voltage output ports 4, are symmetricly set on described casing 15;
First AC transformer 1, is arranged in described casing 15, is connected with one of described two High voltage output ports 4;
Second AC transformer 8, is set in parallel in described casing 15 with described first AC transformer 1, and is connected with another of described two High voltage output ports 4;
High/low temperature constant temperature humidity chamber 14, is arranged on above described casing 15;
Pole cup 3, is arranged in described high/low temperature constant temperature humidity chamber 14, and the two ends of described pole cup 3 are connected with described two High voltage output ports 4 respectively;
Magnetic stirrer 7, is arranged on the below of described pole cup 3, and between described first AC transformer 1 and described second AC transformer 8.
See Fig. 5, described pole cup 3 comprises:
One glass cup 9;
Two bushings 12, the symmetrical two ends being arranged on described glass cup 9 respectively, one end of described two bushings 12, and coaxially arrange with described glass cup 9;
Two band milscale sleeve pipes 13, its one end is connected with the other end of described two bushings 12 respectively, and the other end of described two band milscale sleeve pipes 13 is connected with described two High voltage output ports 4 respectively;
Two electrodes 10, one end of described two electrodes 10 is oppositely arranged in described glass cup 9, and the other end of described two electrodes 10 is each passed through described glass cup 9 and is connected with the sleeve pipe of bushing 12 with described band milscale;
Magnetic stir bar 11, is placed in described glass cup 9.
See Fig. 3, under high-voltage alternating exports test pattern outward, described first AC transformer 1 is directly connected with one of described two High voltage output ports 4, and described second AC transformer 8 is directly connected with two High voltage output ports 4 described in another, can realize the outer output of High AC voltage.
See Fig. 4, under high voltage direct current exports test pattern outward, described first AC transformer 1 is connected with one of described two High voltage output ports 4 by positive polarity rectifier 2, described second AC transformer 8 is connected with two High voltage output ports 4 described in another by negative polarity rectifier 6, realizes the outer output of high-voltage dc voltage.
In the present embodiment, also comprise system controller 5, be arranged on described casing 15, described system controller 5 is connected with described first AC transformer 1, described second AC transformer 8, described magnetic stirrer and described high/low temperature constant temperature humidity chamber 14 respectively.System controller 5 is by polygon control survey First AC transformer and the rate of pressure rise of second AC transformer, the stir speed (S.S.) of magnetic stirrer, and magnitude of voltage when record punctures.System controller 5 also can realize above-mentioned control by wireless telecommunications connected mode.
Principle of work of the present utility model is: utilize two AC transformer to be docked on pole cup 3 and realize ac high voltage input; Utilize two AC transformer to be docked on pole cup 3 respectively by positive-negative polarity rectifier 6 again and realize DC high voltage input, system controller 5 controls the rate of pressure rise of AC transformer, the stir speed (S.S.) of magnetic stirrer, and magnitude of voltage when record punctures.
The utility model realizes combined-voltage by rectifier of contacting respectively in two AC transformer and exports, the mode of pole cup 3 is docked to by adopting two high-voltage power supplies, can obtain on electrode on the basis of identical electric pressure, significantly reduce the requirement of high-voltage power supply external insulation, thus reduce the volume of instrument.And instrument preparation high-voltage output end, easily realizes high-voltage power supply and exports outward, be used in the testing research of breakdown voltage of transformer oil under condition of different temperatures.Be applicable to the assessment of performance of converter power transformer oil-insulation.Particularly there is DC electric field environment for use to transformer oil, DC electric field breakdown potential is pressed with to the insulating oil evaluation of specific requirement.
Certainly; the utility model also can have other various embodiments; when not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the utility model, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the utility model.
Claims (10)
1. a transformer oil alternating current-direct current voltage breakdown measuring instrument, is characterized in that, comprising:
Casing;
First AC transformer, is arranged in described casing;
Second AC transformer, is set in parallel in described casing with described first AC transformer;
Pole cup, two ends are connected with described first AC transformer and described second AC transformer respectively;
Magnetic stirrer, is arranged on the below of described pole cup, and between described first AC transformer and described second AC transformer.
2. transformer oil alternating current-direct current voltage breakdown measuring instrument as claimed in claim 1, it is characterized in that, described pole cup comprises:
One glass cup;
Two bushings, the symmetrical two ends being arranged on described glass cup respectively, one end of described two bushings, and coaxially arrange with described glass cup;
Two band milscale sleeve pipes, are connected with the other end of described two bushings respectively;
Two electrodes, one end of described two electrodes is oppositely arranged in described glass cup, and the other end of described two electrodes is each passed through described glass cup and is connected with described band milscale sleeve pipe with bushing;
Magnetic stir bar, is placed in described glass cup.
3. transformer oil alternating current-direct current voltage breakdown measuring instrument as claimed in claim 2, it is characterized in that, described first AC transformer is connected with the described band milscale sleeve pipe of described pole cup one end by positive polarity rectifier, and described second AC transformer is connected with the described band milscale sleeve pipe of the described pole cup other end by negative polarity rectifier.
4. transformer oil alternating current-direct current voltage breakdown measuring instrument as claimed in claim 2, it is characterized in that, described first AC transformer is directly connected with the described band milscale sleeve pipe of described pole cup one end, and described second AC transformer is directly connected with the described band milscale sleeve pipe of the described pole cup other end.
5. the transformer oil alternating current-direct current voltage breakdown measuring instrument as described in claim 1,2,3 or 4, it is characterized in that, also comprise system controller, be arranged on described casing, described system controller is connected with described first AC transformer, described second AC transformer and described magnetic stirrer respectively.
6. a transformer oil alternating current-direct current voltage breakdown measuring instrument, is characterized in that, comprising:
Casing;
First AC transformer, is arranged in described casing;
Second AC transformer, is set in parallel in described casing with described first AC transformer;
Two High voltage output ports, are symmetricly set on described casing, and described two High voltage output ports are connected with described first AC transformer and the second AC transformer respectively;
High/low temperature constant temperature humidity chamber, is arranged on above described casing;
Pole cup, is arranged in described high/low temperature constant temperature humidity chamber, and the two ends of described pole cup are connected with described two High voltage output ports respectively;
Magnetic stirrer, is arranged on the below of described pole cup, and between described first AC transformer and described second AC transformer.
7. transformer oil alternating current-direct current voltage breakdown measuring instrument as claimed in claim 6, it is characterized in that, described pole cup comprises:
One glass cup;
Two bushings, the symmetrical two ends being arranged on described glass cup respectively, one end of described two bushings, and coaxially arrange with described glass cup;
Two band milscale sleeve pipes, its one end is connected with the other end of described two bushings respectively;
Two electrodes, one end of described two electrodes is oppositely arranged in described glass cup, and the other end of described two electrodes is each passed through described glass cup and is connected with the sleeve pipe of bushing with described band milscale;
Magnetic stir bar, is placed in described glass cup.
8. transformer oil alternating current-direct current voltage breakdown measuring instrument as claimed in claim 7, it is characterized in that, described first AC transformer is connected with one of described two High voltage output ports by positive polarity rectifier, described second AC transformer is connected with High voltage output port described in another by negative polarity rectifier, and the other end of described two band milscale sleeve pipes is connected with described two High voltage output ports respectively.
9. transformer oil alternating current-direct current voltage breakdown measuring instrument as claimed in claim 7, it is characterized in that, described first AC transformer is directly connected with one of described two High voltage output ports, described second AC transformer is directly connected with High voltage output port described in another, and the other end of described two band milscale sleeve pipes is connected with described two High voltage output ports respectively.
10. the transformer oil alternating current-direct current voltage breakdown measuring instrument as described in claim 6,7,8 or 9, it is characterized in that, also comprise system controller, be arranged on described casing, described system controller is connected with described first AC transformer, described second AC transformer, described magnetic stirrer and described high/low temperature constant temperature humidity chamber respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420593202.7U CN204116535U (en) | 2014-10-14 | 2014-10-14 | Transformer oil alternating current-direct current breakdown voltage measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420593202.7U CN204116535U (en) | 2014-10-14 | 2014-10-14 | Transformer oil alternating current-direct current breakdown voltage measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204116535U true CN204116535U (en) | 2015-01-21 |
Family
ID=52333831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420593202.7U Expired - Fee Related CN204116535U (en) | 2014-10-14 | 2014-10-14 | Transformer oil alternating current-direct current breakdown voltage measuring instrument |
Country Status (1)
| Country | Link |
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| CN (1) | CN204116535U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279329A (en) * | 2018-01-06 | 2018-07-13 | 佛山市英标电气有限公司 | A kind of transformer voltage measuring instrument |
| CN109844469A (en) * | 2016-09-13 | 2019-06-04 | 帕塞罗股份有限公司 | Method and apparatus for determining and/or monitoring the breakdown voltage of transformer oil |
-
2014
- 2014-10-14 CN CN201420593202.7U patent/CN204116535U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109844469A (en) * | 2016-09-13 | 2019-06-04 | 帕塞罗股份有限公司 | Method and apparatus for determining and/or monitoring the breakdown voltage of transformer oil |
| CN109844469B (en) * | 2016-09-13 | 2022-05-13 | 帕塞罗股份有限公司 | Method and device for determining and/or monitoring the breakdown voltage of transformer oil |
| CN108279329A (en) * | 2018-01-06 | 2018-07-13 | 佛山市英标电气有限公司 | A kind of transformer voltage measuring instrument |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |