CN111751682A - Pressurization method for on-site partial discharge measurement of overhauled transformer - Google Patents
Pressurization method for on-site partial discharge measurement of overhauled transformer Download PDFInfo
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- CN111751682A CN111751682A CN202010591450.8A CN202010591450A CN111751682A CN 111751682 A CN111751682 A CN 111751682A CN 202010591450 A CN202010591450 A CN 202010591450A CN 111751682 A CN111751682 A CN 111751682A
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- overhaul
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005259 measurement Methods 0.000 title claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 5
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000009825 accumulation Methods 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 230000006866 deterioration Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
A pressurization method for on-site partial discharge measurement of a transformer after overhaul solves the problem that the accumulation effect of internal degradation of insulation is aggravated by the existing on-site partial discharge measurement pressurization method for the transformer after overhaul, and belongs to the technical field of transformer overhaul. The invention comprises the following steps: by applying voltage from the low-voltage side of the transformer, voltage is induced in the high-voltage side
Pressurizing to B1 for A2 at a lower continuous set time A1 to make the continuous apparent partial discharge amount at high voltage end not greater than B2, and finally dropping the voltage to B2
Keeping the set time A3 to make the apparent partial discharge quantity measured at the high voltage line end not more than 100pC, UmIs the high-voltage winding side of the transformerThe highest voltage of the system is set to be,
the method is used for measuring the on-site partial discharge of the transformer in an on-site test after maintenance.
Description
Technical Field
The invention relates to a pressurization method for transformer on-site partial discharge measurement for an on-site test after maintenance, and belongs to the technical field of transformer maintenance.
Background
Under the action of the electric field, the discharge occurs only in a partial region of the insulation system, without penetrating between the conductors to which the voltage is applied, i.e. without breaking down, a phenomenon known as partial discharge. Since the initial stage of partial discharge is of low energy, its discharge does not immediately cause insulation breakdown, and the intact insulation between the electrodes, where no discharge has yet occurred, can still withstand the operating voltage of the equipment. However, under a long-time operation voltage, insulation damage caused by partial discharge continues to develop, and finally insulation accidents occur.
For solid organic insulation, the existing insulation defects can be further developed, the insulation strength is further reduced, and although breakdown is avoided during the test, the accumulation effect and the wound effect of the internal degradation of the insulation are formed, and the situation is avoided as much as possible.
For a transformer which runs for many years, in a field test after overhauling, the pressurizing method for field partial discharge measurement with excitation voltage can cause the accumulation effect of the deterioration in the insulation to be intensified, and potential safety hazards are buried for the transformer to be put into operation in the future.
Disclosure of Invention
The invention provides a pressurizing method for measuring the on-site partial discharge of a transformer after overhaul, aiming at the problem that the accumulated effect of the deterioration in the interior of insulation is aggravated by the existing pressurizing method for measuring the on-site partial discharge of the transformer after overhaul.
The invention discloses a pressurization method for on-site partial discharge measurement of a repaired transformer, which comprises the following steps:
by applying voltage from the low-voltage side of the transformer, voltage is induced in the high-voltage side
Pressurizing to B1 for A2 at a lower continuous set time A1 to make the continuous apparent partial discharge amount at high voltage end not greater than B2, and finally dropping the voltage to B2
Keeping the set time A3 to make the apparent partial discharge quantity measured at the high voltage line end not more than 100pC, UmThe highest voltage of the system on the high-voltage winding side of the transformer,
preferably, when B1 is
When B2 is 500 pC; when B1 is
When B2 is 300 pC.
Preferably, when U ismWhen the voltage is more than or equal to 300kV, A2 is 60 minutes, and when U is equal tom<At 300kV, A2 was 30 minutes.
Preferably, both a1 and A3 are 5 minutes.
The invention has the beneficial effects that: in a field test after maintenance, the invention pressurizes according to the regular curve of the excitation voltage and the excitation time to measure the partial discharge, thereby avoiding the accumulation effect and the wound effect of the deterioration in the transformer insulation caused by the repeated bearing of the test overvoltage of the old overhaul transformer with the over half service life. The invention ensures that the voltage between the side lines does not exceed the designed insulation level, avoids the damage to the insulation of the high-voltage line end, and ensures that the insulation damage continues to develop when the transformer operates normally in the future, thereby finally causing the insulation accident.
Drawings
Fig. 1 is a schematic diagram of the principle of the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Embodiment 1, the pressurization method for in-situ partial discharge measurement of a repaired transformer of this embodiment includes:
after overhaul, the low-voltage side of the transformer is pressurized, and the high-voltage side induces voltage
Continuing for 5 minutes, pressurizing to
Voltage hold for 60 minutes (for U)mNot less than 300kV) or 30 minutes (for U)m<300kV), the continuous apparent partial discharge quantity at the high-voltage line end is not more than 500pC, and finally the voltage is reduced to
Keeping for 5 minutes, and measuring apparent partial discharge amount at high voltage end not more than 100pC, UmThe highest voltage of the system on the high-voltage winding side of the transformer.
The embodiment is suitable for the transformer which runs for no more than 15 years and the voltage rises to
And is composed of
During the fall, the occurrence of partial discharge initiation voltage and extinguishing voltage was recorded. In that
Measuring the apparent charge amount of the partial discharge; at voltage
The partial discharge level was continuously observed and recorded every 5 min.
In the whole measurement process, if: the recorded voltage does not suddenly drop, at voltage
In the following, partial discharges do not show a continuously increasing trend, occasionally with pulses of higher amplitude to appearAnd significant external corona discharge pulses may not be accounted for.
Embodiment 2, the pressurization method for measuring the local discharge in the field of the transformer after overhaul according to this embodiment includes:
by applying voltage from the low-voltage side of the transformer, voltage is induced in the high-voltage side
Continuing for 5 minutes, pressurizing to
Voltage hold for 60 minutes (for U)mNot less than 300kV) or 30 minutes (for U)m<300kV), the continuous apparent partial discharge quantity at the high-voltage line end is not more than 300pC, and finally the voltage is reduced to
Keeping for 5 minutes, and measuring apparent partial discharge amount at high voltage end not more than 100pC, UmThe highest voltage of the system on the high-voltage winding side of the transformer.
This embodiment is suitable for transformers operating for more than 15 years, up to voltage
And is composed of
During the fall, the possible partial discharge starting voltage and extinguishing voltage should be recorded
Measuring the apparent charge amount of the partial discharge; at voltage
Should be observed continuously and recorded every 5 min. In the whole measurement process, if: the recorded voltage does not suddenly drop, at voltage
In the following, partial discharges do not show a continuously increasing trend, occasional higher amplitude pulses and significant external corona discharge pulses may not be counted.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (4)
1. A method of pressurizing a field partial discharge measurement of a repaired transformer, the method comprising:
by applying voltage from the low-voltage side of the transformer, voltage is induced in the high-voltage side
Pressurizing to B1 for A2 at a lower continuous set time A1 to make the continuous apparent partial discharge amount at high voltage end not greater than B2, and finally dropping the voltage to B2
Keeping the set time A3 to make the apparent partial discharge quantity measured at the high voltage line end not more than 100pC, UmThe highest voltage of the system on the high-voltage winding side of the transformer,
2. the method of claim 1, wherein the step of applying the voltage to the in-situ partial discharge measurement of the transformer after the overhaul is performed, wherein the step of applying the voltage to the transformer after the overhaul is performedWhen B1 is
When B2 is 500 pC; when B1 is
When B2 is 300 pC.
3. The method of claim 2, wherein the voltage of the transformer is measured when the voltage of the transformer is measured after the overhaulmWhen the voltage is more than or equal to 300kV, A2 is 60 minutes, and when U is equal tom<At 300kV, A2 was 30 minutes.
4. The pressurization method for in-situ partial discharge measurement of the transformer after overhaul according to claim 3, wherein A1 and A3 are both 5 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010591450.8A CN111751682A (en) | 2020-06-24 | 2020-06-24 | Pressurization method for on-site partial discharge measurement of overhauled transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010591450.8A CN111751682A (en) | 2020-06-24 | 2020-06-24 | Pressurization method for on-site partial discharge measurement of overhauled transformer |
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| Publication Number | Publication Date |
|---|---|
| CN111751682A true CN111751682A (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010591450.8A Pending CN111751682A (en) | 2020-06-24 | 2020-06-24 | Pressurization method for on-site partial discharge measurement of overhauled transformer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226824A (en) * | 2007-02-13 | 2008-07-23 | 天津市三源电力变压器公司 | On-site overhaul process of oversize transformer |
| CN102854444A (en) * | 2012-09-11 | 2013-01-02 | 青海电力科学试验研究院 | Local discharge testing method for +/- 400kV converter transformer |
| CN104062570A (en) * | 2014-07-14 | 2014-09-24 | 国家电网公司 | Power transformer partial discharge signal frequency-selecting method |
| CN204129165U (en) * | 2014-08-12 | 2015-01-28 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of change of current becomes bilateral pressurization local discharge test device |
| CN110208661A (en) * | 2019-06-21 | 2019-09-06 | 中国电建集团河南工程有限公司 | Offshore boosting station transformer pressure resistance local discharge test method |
| CN110456236A (en) * | 2019-07-19 | 2019-11-15 | 中国铁建电气化局集团有限公司 | Railway traction transformer shelf depreciation handover property test method |
| CN110672997A (en) * | 2019-10-12 | 2020-01-10 | 中国电建集团河南工程有限公司 | Transformer induction voltage-withstanding partial discharge test method |
-
2020
- 2020-06-24 CN CN202010591450.8A patent/CN111751682A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226824A (en) * | 2007-02-13 | 2008-07-23 | 天津市三源电力变压器公司 | On-site overhaul process of oversize transformer |
| CN102854444A (en) * | 2012-09-11 | 2013-01-02 | 青海电力科学试验研究院 | Local discharge testing method for +/- 400kV converter transformer |
| CN104062570A (en) * | 2014-07-14 | 2014-09-24 | 国家电网公司 | Power transformer partial discharge signal frequency-selecting method |
| CN204129165U (en) * | 2014-08-12 | 2015-01-28 | 云南电力试验研究院（集团）有限公司电力研究院 | A kind of change of current becomes bilateral pressurization local discharge test device |
| CN110208661A (en) * | 2019-06-21 | 2019-09-06 | 中国电建集团河南工程有限公司 | Offshore boosting station transformer pressure resistance local discharge test method |
| CN110456236A (en) * | 2019-07-19 | 2019-11-15 | 中国铁建电气化局集团有限公司 | Railway traction transformer shelf depreciation handover property test method |
| CN110672997A (en) * | 2019-10-12 | 2020-01-10 | 中国电建集团河南工程有限公司 | Transformer induction voltage-withstanding partial discharge test method |
Non-Patent Citations (1)
| Title |
|---|
| 杜鑫等: "《500KV变压器大修后交流耐压及局部放电检测试验探讨》" * |
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Application publication date: 20201009 |