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A Performance Evaluation Method for Partial Discharge UHF Sensor Based on Time Domain Parameters

A technology of ultra-high frequency sensors and time-domain parameters, which is applied to instruments, measuring electrical variables, measuring devices, etc., can solve the problem that frequency-domain parameters are difficult to clearly and completely describe the behavior characteristics of antennas

Active Publication Date: 2017-09-12
上海迈内能源科技有限公司
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Problems solved by technology

Frequency domain parameters are difficult to clearly and completely describe the behavior characteristics of the antenna when receiving or transmitting pulse signals

Method used

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  • A Performance Evaluation Method for Partial Discharge UHF Sensor Based on Time Domain Parameters
  • A Performance Evaluation Method for Partial Discharge UHF Sensor Based on Time Domain Parameters
  • A Performance Evaluation Method for Partial Discharge UHF Sensor Based on Time Domain Parameters

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings through the embodiments, but the protection scope of the present invention should not be limited thereto.

[0037] A method for evaluating the performance of a partial discharge UHF sensor based on time-domain parameters, the method sequentially includes the following steps:

[0038] (1) Use the existing GTEM chamber pulse measurement system as the electromagnetic measurement environment, and use a high-speed oscilloscope to measure the input signal x(k) from the pulse source and the output signal y(k) of the UHF sensor under test. This embodiment evaluates the performance of two kinds of UHF sensors, logarithmic periodic sensor and elliptical dipole sensor respectively. The sensor structure is as follows figure 1 shown. The selected high-speed oscilloscope is Tektronix DPO70604B, which has 4 channels, 6GHz bandwidth, and 25G sampling rate. The selected GTEM cell is 420...

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Abstract

The invention discloses a partial discharge ultra-high frequency (UHF) sensor performance evaluation method based on time domain parameters. Performance of a UHF sensor is represented through the time domain parameters, a time domain analysis impulse response function is obtained through Hilbert transformation on the basis of GTEM cell impulse measuring system measured data, and three time domain parameters of an envelope peak value, an envelope width and oscillating time are extracted. The ill-conditioned problem caused in the process of time domain parameter obtaining through frequency domain deconvolution is solved by means of the Guillaume-Nahman technology, and the situation that a system impulse response is drowned in high frequency burrs is avoided. Compared with an existing evaluation system, behavior characteristics of the UHF sensor can be described more accurately when an impulse signal is received, and a technical support is provided for effective comparison and analysis of partial discharge UHF detection signal time domain waveforms.

Description

technical field [0001] The invention relates to an evaluation method, in particular to a method for evaluating the performance of a partial discharge ultra-high frequency sensor based on time domain parameters. Background technique [0002] Ultra-high frequency (UHF) detection technology is a widely used partial discharge detection method in the field of insulation state diagnosis of power equipment. When partial discharge occurs inside the power equipment, a very steep pulse current will be generated with a rise time of less than 1ns, thereby exciting electromagnetic waves up to several GHz. UHF detection technology obtains relevant information of partial discharge by receiving and analyzing such electromagnetic wave signals. [0003] The UHF sensor is a device that converts electromagnetic wave signals into voltage signals, and plays a key role in UHF technology. The working mode of the UHF sensor is similar to that of the antenna, and its performance is mostly character...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00
Inventor 陈孝信钱勇许永鹏舒博张一鸣盛戈皞江秀臣
Owner 上海迈内能源科技有限公司
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