CN2441145Y - Antenna for GIS fault detector - Google Patents
Antenna for GIS fault detector Download PDFInfo
- Publication number
- CN2441145Y CN2441145Y CN 00237978 CN00237978U CN2441145Y CN 2441145 Y CN2441145 Y CN 2441145Y CN 00237978 CN00237978 CN 00237978 CN 00237978 U CN00237978 U CN 00237978U CN 2441145 Y CN2441145 Y CN 2441145Y
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- China
- Prior art keywords
- gis
- signal receiver
- antenna
- signal
- shielded cable
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- Expired - Lifetime
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Abstract
The utility model relates to an antenna for a GIS fault detector, which is composed of a signal receiver, an impedance transformer and a shielded cable. The signal receiver presents a ring shape, and the center of the signal receiver is provided with slots. The impedance transformer is connected between the shielded cable and the signal receiver. The utility model can receive the partial discharge signals at the early period of the occurrence of a GIS insulation fault, and a displayer shows if discharge signals exist after the processing of a signal processor.
Description
The utility model relates to a kind of antenna of GIS failure detector.
GIS (gas-insulated metal-enclosed combined electrical apparatus) obtains application more and more widely in electric system, existing more than 70 the GIS transformer station in Guangdong Province is in operation, and working voltage has from 110KV～500KV.Though GIS has very high operational reliability; but the shelf depreciation possibility takes place under the highfield effect to be existed; shelf depreciation is through developing into dielectric breakdown accident after a while; the GIS electric pressure is high more; the loss that accident causes is big more; may cause nuclear reactor to be shut down if dielectric breakdown accident takes place nuclear power station GIS, economic loss is just bigger.The early stage insulation fault principal mode of GIS is a shelf depreciation, have its frequency band of ultrahigh frequency flash-over characteristic very wide (＞1GH2), because GIS is good wave conductor, therefore local discharge superhigh frequency signal (UHF) can be propagated therein, and by GIS insulation basin and flanged seam place to external leakage, so become possibility at externally measured its inner local discharge signal of GIS.The at present domestic data that has report to detect about the GIS internal fault, what have detects the GIS internal fault according to detecting rumble spectrum and vibration acceleration, have according to ultrasound examination GIS internal fault, vibration detection method and ultrasound wave bolt are surveyed low, the inconvenient operation of method sensitivity, are not suitable for GIS insulating monitoring in service.Because these methods, have only as GIS to have an accident moment, when being arranged, very big disruptive discharge energy just can receive signal, at this moment GIS has an accident, has caused very big loss.And these detection methods need a large amount of sensor probes to be mounted on GIS to go up each air chamber and will install one, a common cover GIS has tens air chambers, fixing also very difficult, the inconvenient operation of probe, so these methods can not be found GIS built-in electrical insulation defective early.
The purpose of this utility model is to provide that a kind of volume is little, in light weight, simple in structure, the every degree of spirit is high, measure and make things convenient for, and can receive the antenna of GIS failure detector of the local discharge signal of a whole set of GIS.
For achieving the above object, the antenna of GIS failure detector of the present utility model is made up of signal receiver, impedance transformer, shielded cable, signal receiver be shaped as annular solid, be provided with in the middle of it and meet groove, be connected to impedance transformer between shielded cable and the signal receiver.
After adopting such structure, after just receiving, export by measuring cable through transducer to the local discharge signal that the early stage insulation fault of GIS is occurred, reach and find defective early, eliminate early, prevent the generation of accident effectively, guarantee the safe operation of electrical network.
Fig. 1 is the structural representation of the concrete a kind of embodiment of the utility model.
The antenna of GIS failure detector of the present utility model as shown in Figure 1, form by signal receiver 1, impedance transformer 2, shielded cable 3, signal receiver 1 be shaped as annular solid, be provided with in the middle of it and meet groove 4, be connected to impedance transformer between shielded cable 3 and the signal receiver 1.Introduce the detection test report of this antenna below in concrete use.
The charged detection test report of Zhuhai power office Zhuhai sea station 110KV GIS insulation status
1, test objective:
Station, Zhuhai power office Zhuhai 110KV GIS went into operation in 1996.Whether there is defect situation in order to understand the GIS built-in electrical insulation, measures at the scene with the GIS insulation status monitoring device that province's electric power experimental study is developed.
2, test product specification:
Specification: 110KV GIS
Factory: Xi'an High-tension Switch Factory
3, measuring principle:
Shelf depreciation has high frequency characteristics (high to more than the 1GHz) in the GIS, and high-frequency discharge signal penetrability is strong, can be from the joint leadkage of disc insulator and GIS shell to the outside.Measure the other signal of GIS with measurement mechanism at uhf band (more than the 300MHz), can avoid general electromagnetic interference (EMI), can accurately measure the discharge signal of GIS inside again.
5, test method:
Be placed on by the GIS disc insulator with the antenna of measuring system, the signal by antenna receives to oscillograph, detects the UHF signal of shelf depreciation through signal processing apparatus.Detect all disc insulators.
6, test findings:
Measuring system has measured very strong discharge signal at pearl nine C-wires interval PT and lightning arrester place, and the 2# insulator is other to be the signal maximum.
Also all the other live parts of GIS are also monitored simultaneously, found that the Zhulan tree A-wire has discharge signal in the CT 5# of place insulator side at interval, all the other are surveyed part and are not found discharge signal.
7, conclusion
According to measurement result, can judge has at interval very strong shelf depreciation by pearl nine C-wires (externally to measure amplitude is the mV level to local discharge signal in the general GIS between lightning arrester and the PT, and this measuring-signal reaches tens V), fault is quite serious, immediately interruption maintenance.The Zhulan tree A-wire also has discharge signal (5 places, position) in CT insulator side at interval in addition, and signal amplitude little (12mV) should be strengthened monitoring, observe its situation of change, suggestion is regularly measured it.
8, GIS disintegration situation
On August 4th, 1999 was carried out strip inspection at interval to pearl nine C-wires, find that outer casing inner wall has two place's black spark trackings between lightning arrester and the PT, outer casing inner wall near lightning arrester has many white discharge analytes, lightning arrester and the charged connecting link A of major loop major loop side Mume flower contact and connecting rod mutually have the scorification phenomenon, and there is several roads impression connecting rod and contact junction.(seeing the accompanying drawing photo) from the disintegration situation, measurement and positioning is accurate.
Claims (1)
1, a kind of antenna of GIS failure detector, form by signal receiver (1), impedance transformer (2), shielded cable (3), it is characterized in that: signal receiver (1) be shaped as annular solid, be provided with in the middle of it and meet groove (4), be connected to impedance transformer between shielded cable (3) and the signal receiver (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00237978 CN2441145Y (en) | 2000-08-18 | 2000-08-18 | Antenna for GIS fault detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00237978 CN2441145Y (en) | 2000-08-18 | 2000-08-18 | Antenna for GIS fault detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2441145Y true CN2441145Y (en) | 2001-08-01 |
Family
ID=33599128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00237978 Expired - Lifetime CN2441145Y (en) | 2000-08-18 | 2000-08-18 | Antenna for GIS fault detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2441145Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458454C (en) * | 2005-08-26 | 2009-02-04 | 重庆大学 | Online detector for partial discharge of gas-insulated substation and noise reduction method |
| CN104316853A (en) * | 2014-11-07 | 2015-01-28 | 广东电网有限责任公司电力科学研究院 | Built-in pre-buried ultrahigh-frequency GIS internal partial discharge monitoring sensor |
-
2000
- 2000-08-18 CN CN 00237978 patent/CN2441145Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458454C (en) * | 2005-08-26 | 2009-02-04 | 重庆大学 | Online detector for partial discharge of gas-insulated substation and noise reduction method |
| CN104316853A (en) * | 2014-11-07 | 2015-01-28 | 广东电网有限责任公司电力科学研究院 | Built-in pre-buried ultrahigh-frequency GIS internal partial discharge monitoring sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20100818 Granted publication date: 20010801 |