CN201402305Y - Wiring structure for partial discharge tests of dry-type transformer - Google Patents
Wiring structure for partial discharge tests of dry-type transformer Download PDFInfo
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- CN201402305Y CN201402305Y CN200920071107XU CN200920071107U CN201402305Y CN 201402305 Y CN201402305 Y CN 201402305Y CN 200920071107X U CN200920071107X U CN 200920071107XU CN 200920071107 U CN200920071107 U CN 200920071107U CN 201402305 Y CN201402305 Y CN 201402305Y
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- type transformer
- dry
- partial discharge
- pressure side
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Abstract
The utility model relates to a wiring structure for partial discharge tests of a dry-type transformer, which comprises a dry-type transformer with low-voltage side single-phase applied voltage and a partial discharge detecting instrument. At least one phase connection point of the high-voltage side of the dry-type transformer is grounded via a coupling capacitor and a measuring reactor; and the partial discharge detecting instrument is connected at the two sides of the measuring reactor. Compared with the prior art, the utility model has a simple and convenient wiring mode and can avoid the influence on the measurement result caused by one point earth in a three-phase applied voltage test, thereby being basically the same to the measurement result of a manufacturer.
Description
Technical field
The utility model relates to the dry-type transformer partial discharge test, particularly relates to a kind of wiring construction of dry-type transformer partial discharge test.
Background technology
In recent years, dry-type power transformer is widely adopted in electric system and customer substation as novel electric power equipment.
The dry-type power transformer of solid insulation has advantages such as compact conformation, no greasy dirt, favourable fire prevention, but the often easier technological local defect of hiding of solid cast-type insulation, as pore and impurity is example etc., the shelf depreciation of these weak links may cause perfoliate dielectric breakdown and damage equipment produces fatal harm.
The shelf depreciation test is effective detection means of insulation local defect.Therefore, to solid insulation mutual inductor of 35kV etc., partial discharge test is already as the gainer in the site test.Yet the solid insulation power transformer then because of considering the restriction of test condition, is not carried out the site test of shelf depreciation in the past, judge transformer insulated local defect situation, be unfavorable in time finding and removing a hidden danger thereby can not detect fully and effectively.Must do when for this reason, Shanghai Power Company join to the 35kV dry-type transformer in the Q/SDJ1011-2004 of new promulgation " power equipment handing-over and preventive trial rules " local discharge to have done clearly stipulate (the 6.1st 17 sections).
But, present dry-type power transformer carries out partial discharge test at the scene and does not also satisfy the requirements, reason: 1) transformer in many transformer stations is installed in floor or subterranean layer, and existing local discharge test device and power supply equipment are very huge, can't reach the testing ground; 2) site environment is poor, interference is big.
Because field condition is limit, and is the three-phase intermediate frequency generator that the operating weight volume is not bigger, use on-the-spot construction power supply test can only adopt single-phase pressurization, through intermediate transformer test specimen is applied trial voltage by supply unit.For making test findings and delivery test tool equivalence, be necessary its test connection is improved.
At present, the test connection mode of Ynd Wiring type transformer has one point earth at live end usually, electric field intensity is strengthened near causing the pressurization winding other end, pressurization winding partial discharge quantity is increased, and cause that by the capacitive coupling between the transformer high-low pressure high-tension measurement winding partial discharge quantity increases, might cause erroneous judgement disconnected.
And the test connection mode of Dyn Wiring type transformer is being measured the A phase time, because B point ground connection is strengthened near the mutually electric field intensity of A, partial discharge quantity is increased, it is defective that qualified test product is become, and causes erroneous judgement disconnected, is correct by the above-mentioned analysis of actual measurement proof; And this mode of connection is every will measure twice mutually, as measuring the A phase time, once is the number of winning the confidence of A point, B point ground connection, and another time is the number of winning the confidence of B point, A point ground connection.Get in twice reading higher value as A phase partial discharge quantity.
Summary of the invention
Technical problem to be solved in the utility model is exactly the wiring construction that a kind of dry-type transformer partial discharge test is provided for the defective that overcomes above-mentioned prior art existence.
The purpose of this utility model can be achieved through the following technical solutions: the wiring construction of dry-type transformer partial discharge test, it is characterized in that, the dry-type transformer and the Partial discharge detector that comprise the single-phase pressurization of low-pressure side, on high-tension side at least one phase contact of described dry-type transformer is measured reactance grounded through a coupling condenser and, and described Partial discharge detector is connected in the two ends of measuring reactance.
Described dry-type transformer is a Ynd Wiring type transformer, its low-pressure side a phase contact and low-pressure side b phase contact are connected with trial voltage U, low-pressure side b phase contact ground connection, the high-pressure side A phase contact of described Ynd Wiring type transformer is measured reactance grounded through a coupling condenser and.
Described dry-type transformer is a Dyn Wiring type transformer, its low-pressure side a phase contact and low-pressure side n phase contact are connected with trial voltage U, low-pressure side b phase contact and low-pressure side c contact connection mutually, the high-pressure side three-phase contact of described Dyn Wiring type transformer is measured reactance grounded through a coupling condenser and respectively.
Compared with prior art, the utility model mode of connection is simple, convenient, can avoid the influence to measurement result that one point earth brings in the three characteristics of the middle term applied voltage test, and is basic identical with the equivalence of manufacturing plant measurement result.
Description of drawings
Fig. 1 is the structural representation of embodiment 1 of the present utility model;
Fig. 2 is the structural representation of embodiment 2 of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
The utility model relates to the wiring construction of dry-type transformer partial discharge test, the dry-type transformer 1 and the PD of Partial discharge detector that comprise the single-phase pressurization of low-pressure side, on high-tension side at least one phase contact of described dry-type transformer 1 is measured reactance grounded through a coupling condenser and, and the described PD of Partial discharge detector is connected in the two ends of measuring reactance.
As Fig. 1, present embodiment is applicable to Ynd Wiring type transformer, the low-pressure side a phase contact of Ynd Wiring type transformer and low-pressure side b phase contact are connected with trial voltage U, low-pressure side b phase contact ground connection, and the high-pressure side A phase contact of Ynd Wiring type transformer is through coupling condenser C
KAnd measurement reactance Z
mGround connection, the PD of Partial discharge detector is connected in and measures reactance Z
mTwo ends.
Embodiment 2
As Fig. 2, present embodiment is applicable to Dyn Wiring type transformer, the low-pressure side a phase contact of Dyn Wiring type transformer and low-pressure side n phase contact are connected with trial voltage U, low-pressure side b phase contact and low-pressure side c contact connection mutually, and the high-pressure side A phase contact of Dyn Wiring type transformer is through coupling condenser C
KAAnd measurement reactance Z
MAGround connection, high-pressure side B phase contact is through coupling condenser C
KBAnd measurement reactance Z
MBGround connection, high-pressure side C phase contact is through coupling condenser C
KCAnd measurement reactance Z
MCGround connection, the PD of Partial discharge detector is connected in and measures reactance Z
MA, Z
MBAnd Z
MCTwo ends.
Claims (3)
1. the wiring construction of dry-type transformer partial discharge test, it is characterized in that, the dry-type transformer and the Partial discharge detector that comprise the single-phase pressurization of low-pressure side, on high-tension side at least one phase contact of described dry-type transformer is measured reactance grounded through a coupling condenser and, and described Partial discharge detector is connected in the two ends of measuring reactance.
2. the wiring construction of dry-type transformer partial discharge test according to claim 1, it is characterized in that, described dry-type transformer is a Ynd Wiring type transformer, its low-pressure side a phase contact and low-pressure side b phase contact are connected with trial voltage (U), low-pressure side b phase contact ground connection, the high-pressure side A phase contact of described Ynd Wiring type transformer is measured reactance grounded through a coupling condenser and.
3. the wiring construction of dry-type transformer partial discharge test according to claim 1, it is characterized in that, described dry-type transformer is a Dyn Wiring type transformer, its low-pressure side a phase contact and low-pressure side n phase contact are connected with trial voltage (U), low-pressure side b phase contact and low-pressure side c contact connection mutually, the high-pressure side three-phase contact of described Dyn Wiring type transformer is measured reactance grounded through a coupling condenser and respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920071107XU CN201402305Y (en) | 2009-04-24 | 2009-04-24 | Wiring structure for partial discharge tests of dry-type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920071107XU CN201402305Y (en) | 2009-04-24 | 2009-04-24 | Wiring structure for partial discharge tests of dry-type transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201402305Y true CN201402305Y (en) | 2010-02-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920071107XU Expired - Fee Related CN201402305Y (en) | 2009-04-24 | 2009-04-24 | Wiring structure for partial discharge tests of dry-type transformer |
Country Status (1)
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| CN (1) | CN201402305Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156242A (en) * | 2011-03-25 | 2011-08-17 | 河北省电力研究院 | Method for testing transformer insulation combination |
| CN102495247A (en) * | 2011-12-26 | 2012-06-13 | 安徽省电力公司阜阳供电公司 | Electrical parameter test lead connection method and device for power line |
| CN102590564A (en) * | 2012-03-05 | 2012-07-18 | 天威云南变压器股份有限公司 | Wiring structure for partial discharge test of balance traction transformer |
| CN106291296A (en) * | 2016-09-29 | 2017-01-04 | 国家电网公司 | A kind of partial discharge of transformer defects simulation device and method |
| CN107607844A (en) * | 2017-09-20 | 2018-01-19 | 国网天津市电力公司电力科学研究院 | Dry-type earth transformer scene partial-discharge measuring device and its method |
-
2009
- 2009-04-24 CN CN200920071107XU patent/CN201402305Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156242A (en) * | 2011-03-25 | 2011-08-17 | 河北省电力研究院 | Method for testing transformer insulation combination |
| CN102495247A (en) * | 2011-12-26 | 2012-06-13 | 安徽省电力公司阜阳供电公司 | Electrical parameter test lead connection method and device for power line |
| CN102590564A (en) * | 2012-03-05 | 2012-07-18 | 天威云南变压器股份有限公司 | Wiring structure for partial discharge test of balance traction transformer |
| CN106291296A (en) * | 2016-09-29 | 2017-01-04 | 国家电网公司 | A kind of partial discharge of transformer defects simulation device and method |
| CN106291296B (en) * | 2016-09-29 | 2018-10-26 | 国家电网公司 | A kind of partial discharge of transformer defects simulation device and method |
| CN107607844A (en) * | 2017-09-20 | 2018-01-19 | 国网天津市电力公司电力科学研究院 | Dry-type earth transformer scene partial-discharge measuring device and its method |
| CN107607844B (en) * | 2017-09-20 | 2020-06-30 | 国网天津市电力公司电力科学研究院 | On-site partial discharge measuring device and method for dry-type grounding transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI JIULONG ELECTRIC POWER (GROUP) CO., LTD. |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20110526 Address after: 407 No. 200040, Lane 1394, Zhongxing Road, Shanghai, room 3 Co-patentee after: Shanghai Jiulong Electric Power (Group) Co., Ltd. Patentee after: Shanghai Jiulong electric equipment experiment Co., Ltd. Address before: 407 No. 200040, Lane 1394, Zhongxing Road, Shanghai, room 3 Patentee before: Shanghai Jiulong electric equipment experiment Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100210 Termination date: 20140424 |