CN204188709U - Insulating oil dielectric loss detection system - Google Patents
Insulating oil dielectric loss detection system Download PDFInfo
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- CN204188709U CN204188709U CN201420583562.9U CN201420583562U CN204188709U CN 204188709 U CN204188709 U CN 204188709U CN 201420583562 U CN201420583562 U CN 201420583562U CN 204188709 U CN204188709 U CN 204188709U
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- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 31
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 238000004804 winding Methods 0.000 claims abstract description 12
- 230000005284 excitation Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
The utility model discloses insulating oil dielectric loss detection system, it comprises variable-frequency power sources, exciting transformer T, and reactor L and testing circuit, double-point double-throw switch K1, described double-point double-throw switch K1 comprises the first moving contact and second moving contact of interlock, and the first stationary contact to coordinate with the first moving contact and the second stationary contact, the 3rd stationary contact coordinated with the second moving contact and the 4th stationary contact, wherein, the two ends of described reactor L are connected with the Secondary Winding of exciting transformer T and the first moving contact respectively, described second moving contact is connected with one end of standard capacitor Cn, described first stationary contact is connected with the 3rd stationary contact, described second stationary contact ground connection, described 4th stationary contact is connected between the Secondary Winding of exciting transformer T and reactor L.The utility model becomes the switching of boosting and series resonance boosting, to adapt to the measurement of different test product capacitor by the double-point double-throw switch test excitation realized in the detection of insulating oil dielectric loss.
Description
Technical field
The utility model relates to power equipment maintenance technology field, is specifically related to a kind of insulating oil dielectric loss detection system.
Background technology
Oil-filled equipment such as power transformer is one of equipment main in electric system, also be one of equipment costly, the economic loss caused because of insulation fault is huge, therefore the incipient fault of power transformer how is prevented, guarantee the reliability operation of electrical network, be the important topic that domestic and international electric power studies for a long period of time always.According to insulating oil, the relationship between quality of insulating oil, to the safe and reliable operation of oil-filled equipment, also predicts that oil-filled equipment will produced problem and operation life simultaneously.Insulating oil dielectric dissipation factor (tan δ) as a kind of effectively, the parameter of the oil sample integrity that can judge to insulate, the result quality of dirty and deteriorated Chengdu or the oil of oil in running can be shown, judging oil-filled equipment insulation situation according to this, is particularly fruitful to humidified insulation, aged deterioration distributed defect.So-called dielectric dissipation factor is exactly the complementary angle of voltage and electric current angle on dielectric, and dielectric dissipation factor is only relevant with material behavior, and with the size of material and volume irrelevant.Existing Dielectric Posts method mainly contains bridge method, phase difference method and digital mensuration, and the advantage of bridge method is that reliability is high and accurate, but complicated operation, cannot apply at the scene.Phase difference method test is comparatively simple, adopts mutual inductor mode to carry out, but affected by environment comparatively large, and measuring accuracy is low.And digital mensuration realizes digital filtering technique and vector method test philosophy by dielectric loss measuring instrument, realize detecting by capacitance partial pressure method, measuring accuracy is high, stable performance, but for different oil-filled equipments, varying in size of the test product capacitor of its equivalence, and the boosting mode of this variable-frequency power sources is single, carry out dielectric loss measurement to the test product capacitor of different capacitance size, precision differs, poor universality.
Utility model content
For above deficiency, the purpose of this utility model is to provide a kind of insulating oil dielectric loss detection system, it can become the switching of boosting and series resonance boosting by the double-point double-throw switch test excitation realized in the detection of insulating oil dielectric loss, to adapt to the measurement of different test product capacitor.
For realizing above object, the technical scheme that the utility model is taked is:
Insulating oil dielectric loss detection system, it comprises variable-frequency power sources, exciting transformer T, and reactor L and testing circuit, the output terminal of described variable-frequency power sources is connected with a winding side of exciting transformer T, described testing circuit comprises voltage divider C1, C2, standard capacitor Cn and dielectric loss measuring instrument, after described voltage divider C1 and C2 connects, one end of one end and test product capacitor Cx and standard capacitor Cn is electrically connected, other end ground connection after described voltage divider C1 and C2 connects, three of described dielectric loss measuring instrument detect input interfaces respectively with the other end of test product capacitor Cx, be electrically connected between the other end of standard capacitor Cn and voltage divider C1 and C2, described insulating oil dielectric loss detection system comprises double-pole double-throw K switch 1 further, described double-point double-throw switch K1 comprises the first moving contact and second moving contact of interlock, and the first stationary contact to coordinate with the first moving contact and the second stationary contact, the 3rd stationary contact coordinated with the second moving contact and the 4th stationary contact, wherein, the two ends of described reactor L are connected with the Secondary Winding of exciting transformer T and the first moving contact respectively, described second moving contact is connected with one end of standard capacitor Cn, described first stationary contact is connected with the 3rd stationary contact, described second stationary contact ground connection, described 4th stationary contact is connected between the Secondary Winding of exciting transformer T and reactor L.
The utility model compared with prior art, its beneficial effect is: the utility model becomes boosting by the double-point double-throw switch test excitation realized in the detection of insulating oil dielectric loss, and (the first moving contact coordinates with the second stationary contact, second moving contact coordinates with the 4th stationary contact) and series resonance is boosted, and (the first moving contact coordinates with the first stationary contact, second moving contact coordinates with the 3rd stationary contact) switching, to adapt to little test product capacitor and large test product capacitor (size test product capacitor with the capacitance of 5000pF for boundary) respectively, highly versatile.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model insulating oil dielectric loss detection system.
Embodiment
Below in conjunction with the drawings and specific embodiments, content of the present utility model is described in further details.
Embodiment
Please refer to shown in Fig. 1, insulating oil dielectric loss detection system, it comprises variable-frequency power sources, exciting transformer T, and reactor L, testing circuit and double-point double-throw switch, the input end of variable-frequency power sources is connected to AC power (such as 380V three-phase supply), its output terminal is connected with a winding side of exciting transformer T, testing circuit comprises voltage divider C1, C2, standard capacitor Cn and dielectric loss measuring instrument, after voltage divider C1 and C2 connects, one end of one end and test product capacitor Cx and standard capacitor Cn is electrically connected, other end ground connection after voltage divider C1 and C2 connects, three of dielectric loss measuring instrument detect input interfaces respectively with the other end of test product capacitor Cx, be electrically connected between the other end of standard capacitor Cn and voltage divider C1 and C2, insulating oil dielectric loss detection system comprises double-pole double-throw K switch 1 further, double-point double-throw switch K1 comprises the first moving contact and second moving contact of interlock, and the first stationary contact to coordinate with the first moving contact and the second stationary contact, the 3rd stationary contact coordinated with the second moving contact and the 4th stationary contact, wherein, one end ground connection of the Secondary Winding of exciting transformer T, the other end is connected to the first moving contact by reactor L, second moving contact is connected with one end of standard capacitor Cn, first stationary contact is connected with the 3rd stationary contact, second stationary contact ground connection, 4th stationary contact is connected between the Secondary Winding of exciting transformer T and reactor L.
During use, for the test product capacitor of comparatively low-capacitance (being less than 5000pF), test excitation is adopted to become the mode of boosting (i.e. shunt reactor), now, the first moving contact is connected with the second stationary contact, and the second moving contact is connected with the 4th stationary contact, parallel with one another between reactor L, exciting transformer T and testing circuit, become boosting by excitation and provide power supply to test product capacitor, can realize two frequency conversion automatically anti-interference, measurement effect is best.For the test product capacitor of larger capacitance (being greater than 5000pF), adopt the mode of series resonance boosting, now, first moving contact is connected with the first stationary contact, second moving contact is connected with the 3rd stationary contact, forms the Secondary Winding that cascaded structure is connected to exciting transformer T between reactor L and testing circuit.Series resonance is measured bulky capacitor and is had inherent advantage, only has bulky capacitor ability resonance to lower frequency.
Above-listed detailed description is illustrating for the utility model possible embodiments, and this embodiment is also not used to limit the scope of the claims of the present utility model, does not allly depart from the equivalence that the utility model does and implements or change, and all should be contained in the scope of the claims of this case.
Claims (1)
1. insulating oil dielectric loss detection system, it comprises variable-frequency power sources, exciting transformer T, and reactor L and testing circuit, the output terminal of described variable-frequency power sources is connected with a winding side of exciting transformer T, described testing circuit comprises voltage divider C1, C2, standard capacitor Cn and dielectric loss measuring instrument, after described voltage divider C1 and C2 connects, one end of one end and test product capacitor Cx and standard capacitor Cn is electrically connected, other end ground connection after described voltage divider C1 and C2 connects, three of described dielectric loss measuring instrument detect input interfaces respectively with the other end of test product capacitor Cx, be electrically connected between the other end of standard capacitor Cn and voltage divider C1 and C2, it is characterized in that, described insulating oil dielectric loss detection system comprises double-pole double-throw K switch 1 further, described double-point double-throw switch K1 comprises the first moving contact and second moving contact of interlock, and the first stationary contact to coordinate with the first moving contact and the second stationary contact, the 3rd stationary contact coordinated with the second moving contact and the 4th stationary contact, wherein, the two ends of described reactor L are connected with the Secondary Winding of exciting transformer T and the first moving contact respectively, described second moving contact is connected with one end of standard capacitor Cn, described first stationary contact is connected with the 3rd stationary contact, described second stationary contact ground connection, described 4th stationary contact is connected between the Secondary Winding of exciting transformer T and reactor L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420583562.9U CN204188709U (en) | 2014-10-10 | 2014-10-10 | Insulating oil dielectric loss detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420583562.9U CN204188709U (en) | 2014-10-10 | 2014-10-10 | Insulating oil dielectric loss detection system |
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| Publication Number | Publication Date |
|---|---|
| CN204188709U true CN204188709U (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420583562.9U Expired - Lifetime CN204188709U (en) | 2014-10-10 | 2014-10-10 | Insulating oil dielectric loss detection system |
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| Country | Link |
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| CN (1) | CN204188709U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860982A (en) * | 2017-11-06 | 2018-03-30 | 国网福建省电力有限公司 | The dielectric loss test circuit and its control method that a kind of pre- anti-induced electrical is sent |
| CN114167187A (en) * | 2021-12-07 | 2022-03-11 | 中国南方电网有限责任公司超高压输电公司贵阳局 | AC filter capacitor abnormality detection device |
-
2014
- 2014-10-10 CN CN201420583562.9U patent/CN204188709U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860982A (en) * | 2017-11-06 | 2018-03-30 | 国网福建省电力有限公司 | The dielectric loss test circuit and its control method that a kind of pre- anti-induced electrical is sent |
| CN107860982B (en) * | 2017-11-06 | 2019-12-27 | 国网福建省电力有限公司 | Dielectric loss test circuit for preventing induced electricity from being sent backwards and control method thereof |
| CN114167187A (en) * | 2021-12-07 | 2022-03-11 | 中国南方电网有限责任公司超高压输电公司贵阳局 | AC filter capacitor abnormality detection device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150304 |