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Partial-discharge ultrahigh-frequency-signal detection conditioning circuit

A signal detection and partial discharge technology, which is used in testing circuits, amplitude demodulation of nonlinear bipolar components, and testing dielectric strength, etc. question

Active Publication Date: 2014-09-10
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The real-time sampling detection method is to use a sampling frequency up to 10GHz to sample UHF signals in real time, and then analyze and process the sampled data. The disadvantages are high cost, huge amount of data and calculation, and poor real-time performance, so it is not suitable for on-site applications. Online Monitoring
The spectrum detection method has poor interference suppression ability and is based on a wideband spectrum analyzer, so this method is only used for laboratory research
Compared with the real-time sampling detection method and spectrum detection method, the peak detection method has the advantages of small data volume, good real-time performance, and is easy to design as a multi-channel online detection device. However, the peak detection method has no effect on the noisy signal before peak detection. Any denoising processing, therefore, the peak voltage data obtained by it contains erroneous data, which will lead to inaccurate detection results, thus affecting the actual detection effect of the method

Method used

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  • Partial-discharge ultrahigh-frequency-signal detection conditioning circuit
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Embodiment Construction

[0017] The conditioning circuit for partial discharge UHF signal detection provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] The invention adopts the envelope detection method of the UHF signal to extract the envelope of the UHF signal through the UHF envelope detection circuit, and then samples, analyzes and processes the envelope signal. The detection process of this method can effectively eliminate radio and communication narrowband interference. The envelope signal obtained by sampling is further filtered out by digital signal processing algorithm and pattern recognition algorithm based on signal characteristics. Problems that cannot be suppressed. At the same time, the sampling rate used by the envelope detection method is much lower than that of the real-time sampling detection method, and its data volume, calculation amount and hardware requirements are also greatly reduced,...

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Abstract

Disclosed is a partial-discharge ultrahigh-frequency-signal detection conditioning circuit which includes an input capacitor C0, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R2, a forth resistor R4, a fifth resistor R5, a first diode D1, a second diode D2, a negative bias voltage UB and an amplifier A1. The partial-discharge ultrahigh-frequency-signal detection conditioning circuit improves defects of poor small-signal sensitivity, serious nonlinearity, low response speed and sensitivity to temperature and the like of a basic diode detector circuit through application of DC negative voltage bias and design of a balance-type topological structure on the basis of the basic diode detector circuit so that balance-type negative bias voltage diode detection is finally designed and realized.

Description

technical field [0001] The invention belongs to the technical field of partial discharge detection, in particular to a conditioning circuit for partial discharge UHF signal detection. Background technique [0002] When there are insulation defects inside the power equipment, partial discharge will be generated. The detection of partial discharge can effectively judge the insulation state of the switchgear. [0003] Among the current detection methods for partial discharge signals inside power equipment, UHF method and ultrasonic method are more practical and feasible methods to realize on-line partial discharge monitoring of switchgear. Compared with the online monitoring of ultrasonic method, which requires a large number of sensors and is inconvenient to use on site, the UHF method has a wider monitoring range, fewer sensors for online monitoring, and quick and convenient online detection and positioning of partial discharge. Since UHF method has irreplaceable advantages ...

Claims

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Application Information

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IPC IPC(8): G01R31/14H03D1/10H03D1/02
Inventor 殷军郭浩刘玄
Owner STATE GRID CORP OF CHINA
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