CN203012079U

CN203012079U - A partial discharge UHF sensor internally disposed in a GIS

Info

Publication number: CN203012079U
Application number: CN 201220644341
Authority: CN
Inventors: 周洪涛
Original assignee: Jiangsu Bory Sensing & Inspection Technoloies Co Ltd
Current assignee: Jiangsu Bory Sensing & Inspection Technoloies Co Ltd
Priority date: 2012-11-18
Filing date: 2012-11-18
Publication date: 2013-06-19
Anticipated expiration: 2022-11-18

Abstract

The utility model discloses a partial discharge UHF sensor internally disposed in a GIS. The partial discharge UHF sensor comprises a probe, an amplifying unit, a filtering unit, a microwave detecting unit, and a phase locking and amplifying unit. The probe is mounted in the GIS and is used for acquiring a partial discharge signal in the GIS. The partial discharge signal in the GIS is directly acquired by the ultrahigh-frequency sensor mounted in the GIS in real time. Therefore, the acquiring speed and the acquiring sensitivity of the signal are increased. A signal acquiring interference problem is resolved at a signal acquiring source and the reliability and the authenticity of the signal are increased. In addition, the authenticity of the partial discharge signal analyzed by a partial discharge signal analytic system is guaranteed and the false alarm rate of the system is reduced.

Description

The UHF sensor is put in the built-in office of a kind of GIS

Technical field

The utility model relates to a kind of GIS and puts the UHF sensor built-in innings.

Background technology

Development along with power technology, present high voltage substation has all adopted the tank body combined electrical apparatus structure of enclosure-type basically, the tank body the inside is filled with the FS6 gas of certain pressure as insulating gas, although be filled with the FS6 insulating gas, single combined electrical apparatus tends to bring safely very large hidden danger for substation operation because some insulation defect reasons produce a little partial discharge phenomenons in operational process.Adopted in the past a kind of ultrasonic instrument to carry out off-line type to the monitoring of this partial discharge phenomenon and detect, and detected that not only workload was large, monitoring accuracy is low, and is subjected to external interference very large.

By to the rear discovery of studying for a long period of time of Characteristics of Partial Discharge, when occuring, partial discharge phenomenon can follow a large amount of high frequency electromagnetic wave signal to produce inside FS6 combination tank body, monitor the Emergence and Development rule of these high frequency electromagnetic wave signal, just monitor easily partial discharge phenomenon, put the UHF sensor by in suitable position, FS6 combined electrical apparatus the inside, built-in office being installed, just can real-time monitor very easily the partial discharge phenomenon of FS6 the inside, not only detection efficiency is fast, reliability is high, without external interference.Solved the difficult problem of test in the past.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of GIS to put the UHF sensor built-in innings for the deficiencies in the prior art.

The UHF sensor is put in the built-in office of a kind of GIS, comprises the probe, amplifying unit, filter unit, microwave detection unit and the phase-locked amplifying unit that connect in turn; Probe is contained in GIS inside, is used for gathering the local discharge signal of GIS inside.

By being arranged on the uhf sensor of GIS inside, the Partial discharge signal of direct Real-time Collection GIS inside, picking rate, the sensitivity of signal have been improved, solved the interference problem of collection signal from the signals collecting source, improved reliability, the authenticity of signal, guaranteed the Partial discharge signal of Partial discharge signal analytic system analysis authenticity, reduced the rate of false alarm of system.

Description of drawings

Fig. 1 is the utility model theory diagram;

Fig. 2 is the utility model circuit theory diagrams.

Embodiment

Below in conjunction with specific embodiment, the utility model is elaborated.

With reference to figure 1, sensor comprises probe, amplifying unit, filter unit, microwave detection unit and the phase-locked amplifying unit that connects in turn.

1, probe: probe is used for the inner Partial discharge signal of GIS draws, and is contained in GIS inside, is used for gathering the local discharge signal of GIS inside, gather highly sensitive, without the external interference signal.With reference to figure 2, probe mainly is comprised of acquisition chip J2 and amplification triode D1.

2, amplifying unit: based on the special construction of GIS, the frequency domain of the ultrahigh frequency pulse electromagnetic wave that fault produces is very abundant, and faint pulse signal is submerged in a large amount of noises, process for the ease of the detection that faint electric pulse Partial discharge signal is correlated with, just must carry out suitable amplification to it, be very necessary so choose suitable amplifier circuit unit.With reference to figure 2, mainly formed by light lotus root P521, amplifier 337Y, amplification triode D4.

3, filter unit: at Test Field, interference source is many and the undesired signal amplitude is large, and this has greatly increased the extraction difficulty of Partial discharge signal.With filter unit, Partial discharge signal is carried out filtering, the undesired signals such as corona a large amount of in air are filtered out, be convenient to the detection of back circuit.With reference to figure 2, filter unit mainly is comprised of U5, U6.

4, microwave detection unit: the GIS electric discharge type normally has the peak value of Partial discharge signal and time domain operating frequency phase to determine.In order to obtain UHF signal peak and time domain operating frequency phase information, harvester needs very high sampling rate, and need to record a large amount of data, but a large amount of data volumes is difficult to real-time processing.And utilize wave filter to address this problem, it can take out the modulation signal of low frequency from high-frequency carrier signal, ultrahigh frequency composition filtering with uhf sensor output, and the amplitude of stick signal and phase information, this has just reduced the work for the treatment of of data greatly, has facilitated follow-up signal to process.With reference to figure 2, detection is comprised of master chip U1 and outside support circuit.

5, phase-locked amplifying unit: the ultrahigh frequency pulse electromagnetic wave that phase-locked amplification is put generation with office recovers from a large amount of noises.Its principle is that two paths of signals is sent into phase-sensitive detector (PSD) simultaneously, enters the back and falls irrelevant with the low pass filter filters out of integrating function, and the DC component of output represents the amplitude information of Partial discharge signal, and wherein two paths of signals will satisfy with the requirement of homophase frequently.With reference to figure 2, phase-locked amplification is comprised of chip D5, D6, HEADDR3X2.

The built-in UHF sensor of GIS main performance index is:

Bandwidth: 300MHz-3GHz;

Monitoring range: 70dB;

High sensitivity :-65dBm.

Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection domain of the utility model claims.

Claims

1. a GIS is put the UHF sensor built-in innings, it is characterized in that, comprises the probe, amplifying unit, filter unit, microwave detection unit and the phase-locked amplifying unit that connect in turn; Probe is contained in GIS inside, is used for gathering the local discharge signal of GIS inside.