CN202693737U - Transformer partial discharge UHF (ultra high frequency) sensor - Google Patents
Transformer partial discharge UHF (ultra high frequency) sensor Download PDFInfo
- Publication number
- CN202693737U CN202693737U CN 201220228778 CN201220228778U CN202693737U CN 202693737 U CN202693737 U CN 202693737U CN 201220228778 CN201220228778 CN 201220228778 CN 201220228778 U CN201220228778 U CN 201220228778U CN 202693737 U CN202693737 U CN 202693737U
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- cover plate
- partial discharge
- detection antenna
- transformer
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Abstract
The utility model discloses a transformer partial discharge UHF (ultra high frequency) sensor. The transformer partial discharge UHF sensor comprises a manhole cover plate, a sensor casing, a detection antenna, a signal amplifier and a connecting cover, wherein a sealing and insulating layer is laid on the manhole cover plate; the sensor casing is arranged at the outer part of the sealing and insulating layer, and the sensor casing and the sealing and insulating layer are fixed on the manhole cover plate through at least one fixing piece; the detection antenna is arranged inside a cavity between the sealing and insulating layer and the sensor casing; the detection antenna rightly faces to an opening hole in the manhole cover plate; the signal amplifier is arranged at the outer part of the sensor casing, is electrically connected with the detection antenna, and amplifies an electrical signal detected by the detection antenna; and the connecting cover is arranged at the outer part of the signal amplifier and is connected with the sensor casing in a sealing way. The detection antenna and the amplifier are encapsulated inside the opening hole of the manhole cover plate, and the detection antenna can receive the electrical signal through the opening hole, so that the interference resistance is improved, the signal receiving sensitivity is improved, and the reliability of the transformer partial discharge UHF sensor is improved.
Description
Technical field
The utility model relates to a kind of safety detection technology, is specifically related to a kind of partial discharge of transformer UHF(Ultra High Frequency) sensor.
Background technology
Studies show that, when in the transformer oil shelf depreciation occuring, can evoke up to the uhf electromagnetic wave more than the 1GHz.Shelf depreciation discharge current pulse width is relevant with true discharge capacity in the electromagnetic energy of hyper band and the oil, and pulse width is narrower, and true discharge capacity is higher, and the spectrum energy of hyper band is also higher, is more conducive to detect.Electric system 110kV and above power transformer mostly are Three-phase oil immersion type core formula power transformer, the UHF detection technique have detect that frequency is high, the advantages such as strong interference immunity and sensitivity height, be more suitable for online detection.
The principle of UHF detection technique is: the phenomenon of positive and negative charge neutralization all can appear in transformer when shelf depreciation occurs, and follows this phenomenon all can form towards periphery radiated electromagnetic wave of a steep current impulse.The UHF detection method mainly is that the uhf electromagnetic wave of launching when transformer inside is produced shelf depreciation receives, thereby reaches location and detection to shelf depreciation.
In the prior art, the UHF sensor built-in and external dual mode is installed.Outer sensor is because transformer originally as shielding cavity, can not be brought into play the highly sensitive characteristics of UHF detection technique.Installation of sensors can be guaranteed the detection sensitivity of sensor in transformer inside.At present, the installation method of use is by the Accident of Transformer fuel outlet valve sensor to be inserted the transformer bottom, or installs by the leak valve at transformer top.Therefore just higher requirement has been proposed for the sealing property of UHF sensor, UHF sensor of the prior art all is directly to be arranged at the inside of transformer or to be connected with transformer is supporting, encapsulation process is poor, the sensor anti-interference is poor, signal receiving sensitivity is not high, reliability also can not be guaranteed, and in case the leakage of oil meeting occurs reduces the performance of transformer own and cause the accident.
The utility model content
Technical problem to be solved in the utility model is UHF sensor poor sealing performance of the prior art, and the sensor performance that causes can not be guaranteed, and then a kind of partial discharge of transformer UHF sensor with good sealing property is provided.
For solving the problems of the technologies described above, the utility model provides a kind of partial discharge of transformer UHF sensor, comprising: cover plate for manhole, lay the sealed insulation layer on it;
Sensor outer housing is arranged at described sealed insulation layer outside, by at least one fixture described sensor outer housing and described sealed insulation layer is fixed on the described cover plate for manhole;
In the cavity between described sealed insulation layer and described sensor outer housing the detection antenna is set, the perforate of described detection antenna on the described cover plate for manhole;
It is outside that signal amplifier is arranged at described sensor outer housing, is connected with described detection antenna electric by circuit connecting plate, amplifies the electric signal that described detection antenna detection arrives;
One connects cover, is arranged at described signal amplifier outside, is tightly connected with described sensor outer housing.
Described fixture is two, is symmetricly set in described cover plate for manhole both sides.
Described fixture is the hexagonal bolt.
Described sealed insulation layer is epoxy resin layer.
Technique scheme of the present utility model has following advantage:
Partial discharge of transformer UHF sensor in the utility model arranges the sealed insulation layer at cover plate for manhole, has guaranteed its sealing property.And owing to detecting antenna and amplifier all is packaged within the perforate of cover plate for manhole, and detect antenna and can receive electric signal by perforate, improve thus anti-interference, so that the sensitivity that signal receives is improved, also improved the reliability of sensor.
Description of drawings
For content of the present utility model is more likely to be clearly understood, the below is described in further detail the utility model according to specific embodiment of the utility model also by reference to the accompanying drawings, wherein:
Fig. 1 is the inner structure schematic diagram of the utility model partial discharge of transformer UHF sensor;
Wherein Reference numeral is: the 1-cover plate for manhole, and 2-sealed insulation layer, the 3-sensor outer housing, the 4-signal amplifier, the 5-circuit connecting plate, 6-connects cover, and 7-detects antenna, 8-fixture.
Embodiment
The below provides specific embodiment of the utility model, and as shown in Figure 1, the present embodiment provides a kind of partial discharge of transformer UHF sensor, comprising: cover plate for manhole 1, lay sealed insulation layer 2 on it; Sensor outer housing 3 is arranged at described sealed insulation layer 2 outside, by at least one fixture 8 described sensor outer housing 3 and described sealed insulation layer 2 is fixed on the described cover plate for manhole 1; In the present embodiment, described fixture 8 is two, be symmetricly set in described cover plate for manhole 1 both sides, and described fixture 8 is the hexagonal bolt.
Arrange in the cavity between described sealed insulation layer 2 and described sensor outer housing 3 and detect antenna 7, the perforate of described detection antenna 7 on the described cover plate for manhole 1; Signal amplifier 4 is arranged at described sensor outer housing 3 outsides, is electrically connected with described detection antenna 7 by circuit connecting plate 5, amplifies the electric signal that described detection antenna 7 detects; One connects cover 6, is arranged at described signal amplifier 4 outsides, is tightly connected with described sensor outer housing 3.Described sealed insulation layer 2 is epoxy resin layer.
In the present embodiment, by the manhole mode UHF sensor is installed, is not needed to change the structure of oil tank of transformer, and can in broadband, effectively extract signal, greatly improved the sensitivity that detects.
Obviously, above-described embodiment only is for example clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive.And the apparent variation of being extended out thus or change still are among the protection domain of the utility model creation.
Claims (4)
1. partial discharge of transformer UHF sensor is characterized in that: comprising:
Cover plate for manhole (1) is laid sealed insulation layer (2) on it;
Sensor outer housing (3) is arranged at described sealed insulation layer (2) outside, by at least one fixture (8) described sensor outer housing (3) and described sealed insulation layer (2) is fixed on the described cover plate for manhole (1);
Arrange in the cavity between described sealed insulation layer (2) and described sensor outer housing (3) and detect antenna (7), the perforate of described detection antenna (7) on the described cover plate for manhole (1);
Signal amplifier (4) is arranged at described sensor outer housing (3) outside, is electrically connected with described detection antenna (7) by circuit connecting plate (5), amplifies the electric signal that described detection antenna (7) detects;
One connects cover (6), is arranged at described signal amplifier (4) outside, is tightly connected with described sensor outer housing (3).
2. partial discharge of transformer UHF sensor according to claim 1 is characterized in that:
Described fixture (8) is two, is symmetricly set in described cover plate for manhole (1) both sides.
3. partial discharge of transformer UHF sensor according to claim 2 is characterized in that:
Described fixture (8) is the hexagonal bolt.
4. arbitrary described partial discharge of transformer UHF sensor according to claim 1-3 is characterized in that:
Described sealed insulation layer (2) is epoxy resin layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228778 CN202693737U (en) | 2012-05-21 | 2012-05-21 | Transformer partial discharge UHF (ultra high frequency) sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220228778 CN202693737U (en) | 2012-05-21 | 2012-05-21 | Transformer partial discharge UHF (ultra high frequency) sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202693737U true CN202693737U (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220228778 Expired - Fee Related CN202693737U (en) | 2012-05-21 | 2012-05-21 | Transformer partial discharge UHF (ultra high frequency) sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN202693737U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529309A (en) * | 2013-10-21 | 2014-01-22 | 国家电网公司 | Ultrahigh-frequency sensor based on high-voltage shunt reactor |
| CN104267323A (en) * | 2014-10-14 | 2015-01-07 | 国家电网公司 | Main partial discharge detection device based on built-in UHF sensor |
-
2012
- 2012-05-21 CN CN 201220228778 patent/CN202693737U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529309A (en) * | 2013-10-21 | 2014-01-22 | 国家电网公司 | Ultrahigh-frequency sensor based on high-voltage shunt reactor |
| CN103529309B (en) * | 2013-10-21 | 2015-09-16 | 国家电网公司 | Based on the superfrequency sensor of high-voltage shunt reactor |
| CN104267323A (en) * | 2014-10-14 | 2015-01-07 | 国家电网公司 | Main partial discharge detection device based on built-in UHF sensor |
| CN104267323B (en) * | 2014-10-14 | 2017-02-22 | 国家电网公司 | Main partial discharge detection device based on built-in UHF sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20150521 |
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| EXPY | Termination of patent right or utility model |