CN102721911B - Method and system for impulse withstand voltage test of transformer - Google Patents
Method and system for impulse withstand voltage test of transformer Download PDFInfo
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- CN102721911B CN102721911B CN201210245143.XA CN201210245143A CN102721911B CN 102721911 B CN102721911 B CN 102721911B CN 201210245143 A CN201210245143 A CN 201210245143A CN 102721911 B CN102721911 B CN 102721911B
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Abstract
The invention relates to a method and a system for an impulse withstand voltage test of a transformer. The method is characterized by comprising the following steps of: (1) applying a low-amplitude impulse voltage to a low-voltage winding of the transformer, wherein the maximum value of the amplitude is not more than 50 percent of a test voltage, and the low-amplitude impulse voltage ensures that a high-amplitude impulse voltage is induced on a high-voltage winding of the transformer; and (2) adjusting the low-amplitude impulse voltage to ensure that the waveform of the low-amplitude impulse voltage meets the requirement on an oscillation type operation impulse voltage in the impulse withstand voltage test. Because a voltage transformation principle of the transformer is used and the impulse withstand voltage test is performed step by step, the impulse withstand voltage test in the prior art can be simplified on the premise of safety, low cost and convenience as much as possible, and the function of the impulse withstand voltage test is given into full play.
Description
Technical field
The present invention relates to high voltage and insulation technology field, relate in particular to a kind of impulse voltage endurance test method for transformer and system thereof.
Background technology
The effect of power transformer in electrical network is very important, and withstand voltage test is the important tests project that guarantees power transformer safe operation.Development along with China's extra-high voltage grid, the transformer application of large capacity, voltage levels is more and more extensive, yet, for the transformer of large capacity, voltage levels, except AC voltage withstand test, lightning impulse and switching impulse withstand voltage test are also very important routine tests.
At present, even if implement the impulse voltage withstand test of transformer, its test method is also is mostly when delivery test, by the required surge voltage of additional trial voltage grade, is undertaken.Yet the impulse voltage generator that this test method needs exists that equipment is huge, of a high price, complex structure, be difficult to the problems such as operation, thereby causes this test method to be difficult to generally be applied.As can be seen here, in reality in the urgent need to a kind of convenience, reliable, cheap impulse withstand voltage method and system thereof for transformer.
Summary of the invention
The present invention is intended to solve the problems of the technologies described above and has proposed a kind of impulse voltage endurance test method for transformer, it is characterized in that:
Step (1): apply low amplitude value surge voltage on the low pressure winding of described transformer, its amplitude maximal value is no more than 50% of trial voltage, and described low amplitude value surge voltage makes to induce high amplitude surge voltage on the high pressure winding of described transformer;
Step (2): adjust described low amplitude value surge voltage, make its tilde close the requirement of the desired oscillation mode operating impulse voltage of impulse voltage withstand test.
In addition, the invention also discloses a kind of for implementing the system of said method, described system comprises low amplitude value impulse voltage generator, transformer, and oscillograph, it is characterized in that: described low amplitude value impulse voltage generator is connected on the low pressure winding of described transformer, on the high pressure winding of described transformer, connects a voltage divider, and described voltage divider is also connected with described oscillograph.
Embodiment
For ease of those skilled in the art, understand the present invention, special the invention will be further described.
For this technical scheme of a kind of impulse voltage endurance test method for transformer disclosed in this invention, it is characterized in that:
Step (1): apply low amplitude value surge voltage on the low pressure winding of described transformer, its amplitude maximal value is no more than 50% of trial voltage, and described low amplitude value surge voltage makes to induce high amplitude surge voltage on the high pressure winding of described transformer;
Step (2): adjust described low amplitude value surge voltage, make its tilde close the requirement of the desired oscillation mode operating impulse voltage of impulse voltage withstand test.
For above-described embodiment, the present embodiment has fully demonstrated core thinking of the present invention: i.e. the impulse withstand voltage performance that the induction by transformer self carrys out testing transformer how, and do not rely on other complexity, expensive, be not easy to mobile specialized equipment.With regard to step (1), it makes the present embodiment can be initial, under low amplitude value surge voltage, transformer is carried out to preliminary impulse voltage withstand test, the present embodiment is no more than 50% of trial voltage with the amplitude maximal value of low amplitude value surge voltage to carry out, such as 20%, 30%, or 50%, why like this, mainly for adopt the cause of a lower voltage at impulse voltage withstand test initial period, to adjust voltage in the situation that of low amplitude value, viewing test situation, being convenient to the later stage progressively improves voltage magnitude and makes the impulse voltage withstand test under high voltage more, thereby raising test efficiency, reduce the adjustment number of times of described low amplitude value surge voltage, also can avoid the too high accidental damage bringing of voltage magnitude simultaneously, and then, step (2) is in order to make the waveform in test meet the requirement of related tests, testing requirements herein can be the relevant GB standard-required of country, can be also international relevant IEC standard-required, can also be other non-standard requirements that adopt for exploring new standard object.
Preferably, in another embodiment: the low amplitude value surge voltage in described step (1) obtains by low amplitude value impulse voltage generator, described low amplitude value impulse voltage generator is connected on the low pressure winding of described transformer by high-voltage shielding line.This embodiment define low amplitude value surge voltage source and with the concrete connected mode of low pressure winding.
Preferably, in another embodiment: step (2) also comprises the steps: afterwards
Step (3): gradually the amplitude maximal value of described low amplitude value surge voltage is adjusted to 100% of trial voltage.This embodiment is clearly after waveform adjusts, for the needs of concrete test, and the electric pressure that low pressure winding applies.
Be not limited to above-mentioned test method, the present invention also provides for implementing the system of above-mentioned either method, and described system comprises low amplitude value impulse voltage generator, and transformer, and oscillograph, is characterized in that:
Described low amplitude value impulse voltage generator is connected on the low pressure winding of described transformer, on the high pressure winding of described transformer, connects voltage divider, and described voltage divider is also connected with described oscillograph.
With regard to the disclosed technical scheme of embodiment of said system, the low pressure winding of above-mentioned low amplitude value impulse voltage generator and transformer, high pressure winding, voltage divider and oscillograph are according to after connected mode connects as mentioned above, and we just can implement previously described test method easily.The low amplitude value surge voltage that low amplitude value impulse voltage generator produces puts on low pressure winding and naturally easily understands, as for voltage divider and oscillograph, be for observing High Voltage Impulse Waveform and amplitude, after voltage divider dividing potential drop, will be convenient to oscillograph and observe voltage waveform and/or the amplitude of this side of high pressure winding in its range ability, thereby be convenient to, by adjusting waveform and/or the amplitude of the low amplitude value surge voltage of this side of low pressure winding, make whole impulse voltage withstand test Pass Test requirement.By adjusting the component parameters of described low amplitude value impulse voltage generator, such as resistance, inductance etc., be easy to adjust waveform and/or the amplitude of voltage.Once waveform is adjusted, if the amplitude maximal value that need to improve low amplitude value surge voltage is to the more than 50% of trial voltage, and even 100%, be all easy to realize by adjusting the component parameters of impulse voltage generator.
Preferably, in another embodiment: described low amplitude value impulse voltage generator is connected on the low pressure winding of described transformer by high-voltage shielding line.This embodiment is in order to reduce the disturbing factor of test, guarantees that test accurately as far as possible.
To sum up, the invention solves transformer in prior art and be difficult to carry out easily the problem of impulse voltage withstand test, and corresponding method and system is provided, not only convenient, reliable, and cheap.Just because of the present invention, pass through the varying-voltage principle of transformer self and enforcement impulse voltage withstand test in steps, just be able in the safety of trying one's best, reduce cost as far as possible, enough under prerequisite, simplify impulse voltage withstand test of the prior art easily, thereby give full play to the effect of impulse voltage withstand test.
Above embodiment has been described in detail the present invention, those skilled in the art can make the different embodiments that change to the present invention according to the above description, for example high pressure winding is wherein replaced with to the middle pressure winding of some transformer, or other variations, because some details in embodiment is only more excellent mode, be not construed as limiting the invention.
Claims (2)
1. for an impulse voltage endurance test method for transformer, it is characterized in that:
Step (1): apply low amplitude value surge voltage on the low pressure winding of described transformer, its amplitude maximal value is no more than 50% of trial voltage, and described low amplitude value surge voltage makes to induce high amplitude surge voltage on the high pressure winding of described transformer;
Step (2): adjust described low amplitude value surge voltage, make its tilde close the requirement of the desired oscillation mode operating impulse voltage of impulse voltage withstand test;
Low amplitude value surge voltage in described step (1) obtains by low amplitude value impulse voltage generator, and described low amplitude value impulse voltage generator is connected on the low pressure winding of described transformer by high-voltage shielding line;
Step (2) also comprises the steps: afterwards
Step (3): gradually the amplitude maximal value of described low amplitude value surge voltage is adjusted to 100% of trial voltage.
2. one kind for implementing the system of the claims 1 method, described system comprises low amplitude value impulse voltage generator, transformer, and oscillograph, it is characterized in that: described low amplitude value impulse voltage generator is connected on the low pressure winding of described transformer, on the high pressure winding of described transformer, connect voltage divider, described voltage divider is also connected with described oscillograph.
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| CN201210245143.XA CN102721911B (en) | 2012-07-16 | 2012-07-16 | Method and system for impulse withstand voltage test of transformer |
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| CN201210245143.XA CN102721911B (en) | 2012-07-16 | 2012-07-16 | Method and system for impulse withstand voltage test of transformer |
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| CN102721911A CN102721911A (en) | 2012-10-10 |
| CN102721911B true CN102721911B (en) | 2014-11-26 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105954654B (en) * | 2016-04-26 | 2018-10-16 | 西安交通大学 | A kind of transformer induction formula impulse withstand voltage testing failure diagnostic method and system |
| CN108490321A (en) * | 2018-03-21 | 2018-09-04 | 广东电网有限责任公司电力科学研究院 | A kind of induction type switching impulse Withstand test device |
| CN108872775A (en) * | 2018-04-13 | 2018-11-23 | 山东电力设备有限公司 | AC and DC transformer coil surge voltage measuring and analysis system and method |
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| CN101452059A (en) * | 2007-11-30 | 2009-06-10 | 上海市电力公司 | Impulse voltage endurance test method |
| CN101526580A (en) * | 2009-01-16 | 2009-09-09 | 国网电力科学研究院 | Method for testing on-site impact of gas insulated switchgear |
| CN201540348U (en) * | 2009-12-07 | 2010-08-04 | 苏州市华电电气技术有限公司 | Portable alternating-current withstand voltage testing device of high-voltage electric device |
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| JPS6056269A (en) * | 1983-09-08 | 1985-04-01 | Fuji Electric Co Ltd | Ac withstand voltage testing method of transformer |
| JPS61176869A (en) * | 1985-02-01 | 1986-08-08 | Hitachi Ltd | Method for testing lightning impulse voltage or transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452059A (en) * | 2007-11-30 | 2009-06-10 | 上海市电力公司 | Impulse voltage endurance test method |
| CN101526580A (en) * | 2009-01-16 | 2009-09-09 | 国网电力科学研究院 | Method for testing on-site impact of gas insulated switchgear |
| CN201540348U (en) * | 2009-12-07 | 2010-08-04 | 苏州市华电电气技术有限公司 | Portable alternating-current withstand voltage testing device of high-voltage electric device |
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| JP昭60-56269A 1985.04.01 * |
| JP昭61-176869A 1986.08.08 * |
| 刘友翔等.变压器的现场操作波感应耐压试验.《华东电力》.1997,(第9期),正文第36页左栏倒数第1段，第37页左栏第2段，图1. * |
| 变压器的现场操作波感应耐压试验;刘友翔等;《华东电力》;19971231(第9期);正文第36页左栏倒数第1段，第37页左栏第2段，图1 * |
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