CN203164353U - Head dismantling-free transformer medium spectrum testing structure - Google Patents
Head dismantling-free transformer medium spectrum testing structure Download PDFInfo
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- CN203164353U CN203164353U CN 201320145017 CN201320145017U CN203164353U CN 203164353 U CN203164353 U CN 203164353U CN 201320145017 CN201320145017 CN 201320145017 CN 201320145017 U CN201320145017 U CN 201320145017U CN 203164353 U CN203164353 U CN 203164353U
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- pressure winding
- winding
- voltage winding
- low pressure
- low voltage
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Abstract
The utility model relates to a head dismantling-free transformer medium spectrum testing structure, which is used for testing a high-medium voltage winding and a low voltage winding in a transformer, wherein the high-medium voltage winding and the low voltage winding are connected to form a circuit. The testing structure comprises a high voltage electrode, a low voltage electrode, a grounding electrode and a test component, wherein the high voltage electrode is connected with the low voltage winding through a connection circuit, the low voltage electrode is connected with the high-medium winding through a connection circuit, and the test component is connected to the circuit formed by connecting the high-medium voltage winding and the low voltage winding. Compared with the prior art, test results of the testing structure reflect the overall insulation of the low voltage winding to the high-medium voltage winding and the ground, the connection method can be changed flexibly, impacts imposed on the test by circuits are eliminated, and partial insulation parameters of the transformer to be tested can also be measured.
Description
Technical field
The utility model relates to a kind of test structure, especially relates to a kind of not disconnection formula transformer medium spectrum test structure.
Background technology
General, the FDS measuring method is the alternating voltage that adds different frequency at the major insulation system two ends that needs are measured, electric current by measuring this alternating voltage and being produced by whole axisymmetric compound inslation system calculates dielectric loss value and capacitance under the corresponding frequencies.As previously mentioned, the IDAX tester provides the mode of connection of four kinds of test products.Can carry out according to type and the site specific of physical device.Principle roughly is as follows: 1) whether ground connection coming determines UST or GST mode according to test product; 2) according to test product electric capacity and stray capacitance distribution situation to determine whether to adopt shielding mode
Be example with the two-winding transformer, if transformer major insulation is measured, because of major insulation and earth-free, select the UST mode; Because there is stray capacitance over the ground in the high and low pressure sleeve pipe, select earthing mode, at test major insulation C
HLThe time, the end of high-low pressure winding sleeve pipe shields whether ground connection usually forms influence to measuring the loop, if sleeve pipe is in good condition, the test whether ground connection does not influence transformer major insulation is shielded at the end, so when testing at the scene, at first should confirm whether normal, bottom shielding of bushing situation such as ground connection whether of sleeve pipe.Owing to be connected to lightning arrester, capacitance type potential transformer and ground connection disconnecting link etc. on the bus, there is the additional capacitor of several ten thousand pF, have a strong impact on measurement result.
The utility model content
The purpose of this utility model is exactly to provide a kind of not disconnection formula transformer medium simple in structure, that can change mode of connection flexibly to compose test structure for the defective that overcomes above-mentioned prior art existence.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of not disconnection formula transformer medium spectrum test structure, height-middle pressure winding and the low pressure winding that is used for the test transformer, described height-middle pressure winding and low pressure winding connect and compose a loop, this test structure comprises high-field electrode, low-field electrode, ground-electrode and test component, described high-field electrode is connected with the low pressure winding through connection line, described low-field electrode is connected with height-middle pressure winding through connection line, and described test component is connected on the loop that height-middle pressure winding and low pressure winding connect and compose.
The loop one end ground connection that described height-middle pressure winding and low pressure winding connect and compose.
Described height-middle pressure winding and low pressure winding are connected with telefault, are in series with electric capacity between the described telefault.
Be provided with electric capacity between described height-middle pressure winding and the loop.
Be provided with electric capacity between described low pressure winding and the loop.
Compared with prior art, measurement result reflection low pressure winding of the present utility model is to the integral insulation on high pressure winding and ground, and can change mode of connection flexibly, get rid of circuit to the influence of test, can also measure the SI semi-insulation parameter of transformer to be measured.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Among the figure, 1 is that high-field electrode, 2 is that low-field electrode, 3 is that ground-electrode, 4 is that test component, 5 is that low pressure winding, 6 is height-middle pressure winding.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Embodiment
A kind of not disconnection formula transformer medium spectrum test structure, its structure as shown in Figure 1, height-middle pressure winding 6 and the low pressure winding 5 that is used for the test transformer, wherein high-middle pressure winding 6 and low pressure winding 5 connect and compose a loop, the disclosed test structure of present embodiment comprises high-field electrode 1, low-field electrode 2, ground-electrode 3 and test component 4, high-field electrode 1 is connected with low pressure winding 5 through connection line, low-field electrode 2 is connected with height-middle pressure winding 6 through connection line, test component 4 is connected on the loop that height-middle pressure winding 6 and low pressure winding 5 connect and compose, an end ground connection in this loop.Wherein, height-middle pressure winding 6 and low pressure winding 5 are connected with telefault, are in series with capacitor C between two telefaults
HT, between height-middle pressure winding 6 and loop, be provided with capacitor C
T, be provided with capacitor C between low pressure winding 5 and the loop
H
Adopt said apparatus spare transformer to be carried out the FDS measurement, transformer C
HAnd C
TThe dielectric loss value of SI semi-insulation when temperature is low is higher, and C
HTThe dielectric loss value of SI semi-insulation then is subjected to Temperature Influence hardly, can do following preliminary interpretation: insulation (C between Transformer Winding
HT) mainly formed by the oilpaper compound inslation, wherein cardboard and stay occupy sizable ratio, and the water cut in the paper can produce bigger influence to the frequency domain dielectric spectra, and winding insulation against ground (C
H, C
T) then mainly formed by transformer oil, the state of oil plays a decisive role to state of insulation.When temperature reduced, transformer oil solubleness reduced, and moisture spreads in cardboard, but this diffusion needs the time of several months just can reach equilibrium state, and this can not reach for transformer actual motion, the load dynamic change.When environment temperature reduced, moisture was separated out the free water that is converted into suspension from oil, thereby made oil present stronger polarity, and dielectric loss increases.
Claims (5)
1. a not disconnection formula transformer medium is composed test structure, height-middle pressure winding and the low pressure winding that is used for the test transformer, described height-middle pressure winding and low pressure winding connect and compose a loop, it is characterized in that, this test structure comprises high-field electrode, low-field electrode, ground-electrode and test component, described high-field electrode is connected with the low pressure winding through connection line, described low-field electrode is connected with height-middle pressure winding through connection line, and described test component is connected on the loop that height-middle pressure winding and low pressure winding connect and compose.
2. a kind of not disconnection formula transformer medium spectrum test structure according to claim 1 is characterized in that the loop one end ground connection that described height-middle pressure winding and low pressure winding connect and compose.
3. a kind of not disconnection formula transformer medium spectrum test structure according to claim 1 is characterized in that described height-middle pressure winding and low pressure winding are connected with telefault, are in series with electric capacity between the described telefault.
4. a kind of not disconnection formula transformer medium spectrum test structure according to claim 1 is characterized in that, is provided with electric capacity between described height-middle pressure winding and the loop.
5. a kind of not disconnection formula transformer medium spectrum test structure according to claim 1 is characterized in that, is provided with electric capacity between described low pressure winding and the loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320145017 CN203164353U (en) | 2013-03-27 | 2013-03-27 | Head dismantling-free transformer medium spectrum testing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320145017 CN203164353U (en) | 2013-03-27 | 2013-03-27 | Head dismantling-free transformer medium spectrum testing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203164353U true CN203164353U (en) | 2013-08-28 |
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ID=49025530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320145017 Expired - Lifetime CN203164353U (en) | 2013-03-27 | 2013-03-27 | Head dismantling-free transformer medium spectrum testing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203164353U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062526A (en) * | 2014-06-30 | 2014-09-24 | 国家电网公司 | Oil-oil bushing cable outlet transformer test method without head removing |
| CN104634823A (en) * | 2015-01-26 | 2015-05-20 | 江南大学 | Method for rapidly detecting content of polar components in frying oil |
| CN110221130A (en) * | 2019-04-22 | 2019-09-10 | 贵州电网有限责任公司 | A kind of capacitance type potential transformer measurement structure and measurement method |
-
2013
- 2013-03-27 CN CN 201320145017 patent/CN203164353U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062526A (en) * | 2014-06-30 | 2014-09-24 | 国家电网公司 | Oil-oil bushing cable outlet transformer test method without head removing |
| CN104634823A (en) * | 2015-01-26 | 2015-05-20 | 江南大学 | Method for rapidly detecting content of polar components in frying oil |
| CN104634823B (en) * | 2015-01-26 | 2017-05-03 | 江南大学 | Method for rapidly detecting content of polar components in frying oil |
| CN110221130A (en) * | 2019-04-22 | 2019-09-10 | 贵州电网有限责任公司 | A kind of capacitance type potential transformer measurement structure and measurement method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
|
| CX01 | Expiry of patent term |