CN114089019A - A portable heating type insulating oil breakdown voltage tester and test method - Google Patents
A portable heating type insulating oil breakdown voltage tester and test methodDownload PDFInfo
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- CN114089019A CN114089019ACN202111264570.8ACN202111264570ACN114089019ACN 114089019 ACN114089019 ACN 114089019ACN 202111264570 ACN202111264570 ACN 202111264570ACN 114089019 ACN114089019 ACN 114089019A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
Translated fromChinese
Description
Technical Field
The invention relates to the technical field of insulating oil breakdown voltage testing, in particular to a portable heating type insulating oil breakdown voltage tester and a testing method.
Background
For a long time, transformer insulating oil is widely applied to power transformers with excellent electrical performance as an important medium for insulation and heat dissipation. In particular, high-voltage power transformers are often oil-immersed. The breakdown voltage is an important index of the electrical strength of the insulating oil, is a measure of the voltage endurance capacity of the insulating oil in a transformer, and reflects the presence of moisture, impurities and conductive particles in the oil and the severity of the influence of the moisture, impurities and conductive particles on the insulating oil. The quality of the oil immersed transformer can change and age due to various reasons in the operation process, so that the insulation performance is reduced, and the safe operation and maintenance of the transformer are influenced. Therefore, the electrical strength of the transformer insulating oil is periodically tested to check whether the insulating property is qualified.
The existing transformer insulating oil breakdown voltage testing instrument is mainly completed by depending on manual operation of an operator in the testing process, the testing efficiency is low, the size of the device is large, transportation is very difficult, the distance is far away, bumping influence on testing precision is caused, boosting is difficult to guarantee simultaneously, and the accuracy and the operation safety of a testing result are difficult to guarantee.
Disclosure of Invention
The invention aims to provide a portable heating type insulating oil breakdown voltage tester and a testing method, which can solve the problems that in the prior art, the efficiency of manually completing breakdown voltage testing by personnel is low, the size of the tester is large, and the testing precision is possibly inaccurate in the transportation process.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the invention provides a portable heating type insulating oil breakdown voltage tester, which comprises a power supply module, a control circuit, a reversible circuit, a voltage regulator, a boosting test circuit, an overcurrent protection circuit, a voltage sampling circuit, a data processing module, a heating plate and a data output module, wherein the control circuit is connected with the reversible circuit; the power supply module supplies power to the control circuit, a first output end of the control circuit is connected with an input end of the reversible circuit, an output end of the reversible circuit is connected with an input end of the voltage regulator, and an output end of the voltage regulator is connected with an input end of the boosting test circuit; a first output end of the boosting test circuit outputs high voltage to an oil cup containing insulating oil to be detected, and a second output end of the boosting test circuit is connected with an input end of the overcurrent protection circuit; the output end of the over-current protection circuit is connected with the input end of the voltage sampling circuit, and the output end of the voltage sampling circuit is connected with the input end of the control circuit; the second output end of the control circuit is connected with the data processing module, and the data processed by the data processing module is output by the data output module; the heating plate is used for heating an oil cup containing insulating oil to be detected.
Further, the maximum temperature of the heating plate for heating the oil cup is 55-60 ℃.
In a second aspect, the invention provides a portable heating type insulation oil breakdown voltage testing method, which comprises the following steps:
s1, controlling the insulating oil breakdown voltage tester to output a set voltage value to perform breakdown test on the insulating oil;
step S2, judging whether the insulating oil is broken down, if yes, turning to step S4, and if not, turning to step S3;
s3, heating the insulating oil, controlling the insulating oil breakdown voltage tester to output a set voltage value to perform breakdown test on the insulating oil again, and returning to the S2;
step S4, recording the breakdown voltage when the insulating oil is broken down;
step S5, repeating the steps S1 to S4 for a plurality of times;
and step S6, calculating the average value of the breakdown voltage for a plurality of times and outputting the average value of the breakdown voltage.
Further, the set voltage value is set according to a voltage value of unused pure insulating oil when the oil is broken down.
Further, in the step S3, the maximum temperature for heating the insulating oil is 55 to 60 ℃.
The portable heating type insulating oil breakdown voltage tester and the testing method have the advantages that the weight is light, the transportation is easy, the anti-vibration device is arranged in the tester, the stability is realized in the instrument transportation process, the testing precision is not influenced by remote routes and bumping, meanwhile, the heating device is additionally arranged, the purpose of boosting can be achieved as soon as possible, the device is easy to carry to a transformer substation to carry out insulating oil breakdown voltage testing, the state of an oil sample after the hanging core of the on-load tap-changer is mastered in time, whether the specification requirement is met or not is met, the time for returning the oil sample is saved, the power failure time is shortened, and the working efficiency and the power supply reliability are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of the circuit of the portable heating type insulation oil breakdown voltage tester of the present invention;
fig. 2 is a flow chart of the portable heating type insulation oil breakdown voltage testing method of the invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The invention discloses a portable heating type insulating oil breakdown voltage tester, which comprises a power supply module, a control circuit, a reversible circuit, a voltage regulator, a boosting test circuit, an overcurrent protection circuit, a voltage sampling circuit, a data processing module, a heating plate and a data output module, wherein the control circuit, the reversible circuit, the voltage regulator, the boosting test circuit, the overcurrent protection circuit, the voltage sampling circuit, the data processing module, the heating plate and the data output module are arranged in sequence. The power module supplies power to the control circuit, the first output end of the control circuit is connected with the input end of the reversible circuit, the output end of the reversible circuit is connected with the input end of the voltage regulator, and the output end of the voltage regulator is connected with the input end of the boosting test circuit. The first output end of the boosting test circuit outputs high voltage to an oil cup containing insulating oil to be detected, and the second output end of the boosting test circuit is connected with the input end of the overcurrent protection circuit. The output end of the over-current protection circuit is connected with the input end of the voltage sampling circuit, and the output end of the voltage sampling circuit is connected with the input end of the control circuit. And a second output end of the control circuit is connected with the data processing module, and the data processed by the data processing module is output by the data output module. The heating plate is used for heating an oil cup containing insulating oil to be detected.
The function of each unit circuit is as follows:
a power supply module: providing a working voltage for the control circuit;
the control circuit: the central pivot of the tester device controls the operation of each unit circuit;
a data processing module: screening the test data;
a data output module: outputting the test data;
reversible circuit: preventing current reversal;
a voltage regulator: adjusting the voltage;
and (3) boosting test: raise the voltage
An oil cup: placing insulating oil;
overcurrent protection: a protection circuit;
voltage sampling: the test voltage is sampled.
The working principle of the portable heating type insulating oil breakdown voltage tester is as follows:
after the staff sends the test command, the tester starts motor forward motion under the control circuit effect, steps up to the magnitude of voltage of settlement, carries out the breakdown test of discharging to the insulating oil that holds in the oil cup. The set voltage value is set according to the voltage value of the unused pure insulating oil when it is broken down. If the insulating oil of the transformer is broken down or the boosting voltage reaches the maximum value of the test voltage in the boosting process, one-time test is finished. The judging mode of whether the insulating oil is broken down is as follows: the voltage sampling circuit is used for the voltage of the boosting test module, if the voltage signal can be collected, the insulating oil is indicated to be broken down, and if the voltage signal cannot be collected, the insulating oil is indicated to not be broken down. If the insulating oil is not broken down, the voltage is not met, a heating plate is arranged at the bottom of the oil cup, the oil sample with breakdown voltage not meeting the regulation requirement can be automatically heated, the highest heating temperature is generally 55-60 ℃, the evaporation of water vapor in the oil is promoted by heating, water and impurities in the oil are removed, and the purpose of boosting the pressure is achieved. After the insulating oil is heated, the voltage breakdown test is carried out on the insulating oil again, when a breakdown signal generated when the insulating oil is broken down in the boosting process reaches an upper limit position, a signal sent by the position switch is sent to the control system to cause the control system to be interrupted, the motor stops running, the breakdown voltage value when the insulating oil is broken down is recorded, then the motor is controlled to run reversely, the test voltage is enabled to return to zero, and the next test is prepared. Several more tests were performed on the samples, and then the average of the breakdown voltages was calculated and the data was output as the average of the breakdown voltages.
The invention also provides a portable heating type insulation oil breakdown voltage testing method, as shown in figure 2, comprising the following steps:
s1, controlling the insulating oil breakdown voltage tester to output a set voltage value to perform breakdown test on the insulating oil;
the set voltage value is set according to the voltage value of the unused pure insulating oil when it is broken down.
Step S2, judging whether the insulating oil is broken down, if yes, turning to step S4, and if not, turning to step S3;
s3, heating the insulating oil, controlling the insulating oil breakdown voltage tester to output a set voltage value to perform breakdown test on the insulating oil again, and returning to the S2;
step S4, recording the breakdown voltage when the insulating oil is broken down;
step S5, repeating the steps S1 to S4 for a plurality of times;
and step S6, calculating the average value of the breakdown voltage for a plurality of times and outputting the average value of the breakdown voltage.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (5)
Translated fromChinesePriority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111264570.8ACN114089019A (en) | 2021-10-28 | 2021-10-28 | A portable heating type insulating oil breakdown voltage tester and test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111264570.8ACN114089019A (en) | 2021-10-28 | 2021-10-28 | A portable heating type insulating oil breakdown voltage tester and test method |
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| CN114089019Atrue CN114089019A (en) | 2022-02-25 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2031150U (en)* | 1987-12-05 | 1989-01-18 | 陕西省汉中市变压器厂 | Purifier for insulating oil |
| CN102585991A (en)* | 2011-12-22 | 2012-07-18 | 北京盈胜泰科技术有限公司 | Method and system for removing and supplying antioxidant from/to transformer insulating oil impurities |
| CN102788937A (en)* | 2011-05-19 | 2012-11-21 | 上海华明电力设备制造有限公司 | Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line |
| US20140055149A1 (en)* | 2011-12-13 | 2014-02-27 | State Grid Corporation Of China | Tester for measuring insulating properties of cross-linked polyethylene |
| CN103861734A (en)* | 2014-03-12 | 2014-06-18 | 无锡市曙光电缆有限公司 | Partial-discharge-free insulating oil purification device |
| CN106635246A (en)* | 2016-12-12 | 2017-05-10 | 国网河南省电力公司电力科学研究院 | High-overload transformer oil and preparation process thereof |
| CN107987870A (en)* | 2017-11-30 | 2018-05-04 | 广东电网有限责任公司电力科学研究院 | A kind of purification method of insulating oil |
| CN209508179U (en)* | 2019-01-23 | 2019-10-18 | 武汉泽电新材料有限公司 | A kind of production equipment of insulating oil |
- 2021
- 2021-10-28CNCN202111264570.8Apatent/CN114089019A/enactivePending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2031150U (en)* | 1987-12-05 | 1989-01-18 | 陕西省汉中市变压器厂 | Purifier for insulating oil |
| CN102788937A (en)* | 2011-05-19 | 2012-11-21 | 上海华明电力设备制造有限公司 | Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line |
| US20140055149A1 (en)* | 2011-12-13 | 2014-02-27 | State Grid Corporation Of China | Tester for measuring insulating properties of cross-linked polyethylene |
| CN102585991A (en)* | 2011-12-22 | 2012-07-18 | 北京盈胜泰科技术有限公司 | Method and system for removing and supplying antioxidant from/to transformer insulating oil impurities |
| CN103861734A (en)* | 2014-03-12 | 2014-06-18 | 无锡市曙光电缆有限公司 | Partial-discharge-free insulating oil purification device |
| CN106635246A (en)* | 2016-12-12 | 2017-05-10 | 国网河南省电力公司电力科学研究院 | High-overload transformer oil and preparation process thereof |
| CN107987870A (en)* | 2017-11-30 | 2018-05-04 | 广东电网有限责任公司电力科学研究院 | A kind of purification method of insulating oil |
| CN209508179U (en)* | 2019-01-23 | 2019-10-18 | 武汉泽电新材料有限公司 | A kind of production equipment of insulating oil |
Non-Patent Citations (4)
| Title |
|---|
| 夏鲁江 等: "运行中变压器绝缘油的维护"", 农村电气化, pages 27 - 28* |
| 徐君;张贤明;韩敏;张慧;: "绝缘油击穿电压实验研究", 重庆工商大学学报(自然科学版), no. 01* |
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