Ultra-high frequency positioning and detection device of local discharge of electrical equipment and method thereof

Abstract

The invention relates to an ultra-high frequency positioning and detection device of local discharge of electrical equipment and a method thereof, belonging to the technical field of experiments of local discharge of the electrical equipment. The device comprises a steep-sided pulse generator, an ultra-high frequency antenna, a high frequency coaxial cable and a high sampling rate oscilloscope. The device is characterized in that the steep-sided pulse generator is a nanosecond pulse generator. The method performs the positioning computation by using the device and a computer through a program and a positioning principle based on the time difference method. The device has simple connection; nanosecond pulse signals generated by the steep-sided pulse generator can really simulate ultra-high frequency signals of the local discharge of the electrical equipment and have strong interference resistance and high accuracy of read time different signals, thereby improving the positioning accuracy. The invention can be widely applied to the experiment of the ultra-high frequency positioning detection of the local discharge of the electrical equipment.

Description

technical field [0001] The invention belongs to the technical field of partial discharge experiments of electrical equipment, and in particular relates to an experimental device and method for ultra-high frequency positioning detection of partial discharges of electrical equipment. Background technique [0002] The stable operation of various electrical equipment is one of the important conditions for the stability of the power system. Operation experience shows that the threat to the safety of electrical equipment operation mainly comes from the insulation system, and insulation defects in various parts of electrical equipment may lead to different degrees of partial discharge. Long-term partial discharge will degrade the insulation, threaten the safe operation of electrical equipment, cause failures during operation, and affect the stable operation of the power system. Therefore, it is very necessary to conduct insulation monitoring on electrical equipment. Partial disch...

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Problems solved by technology

The main disadvantage of the partial discharge location system and location method is that the simulated discharge source is simulated by a piezoelectric igniter. Due to the unmeasurable and unadjustable parameters such as the specific voltage of the piezoelectric igniter, it is difficult to adjust the parameters for each simulated discharge. The unknowability of parameters such as the waveform and phase emitted by the power supply, in further positioning, makes it very difficult to determine the time characteristic points of the UHF signal waveform transmitted and received by the UHF antenna, and thus it is impossible to accurately obtain the delay time

The main disadvantage of this pulse generator is: the amplitude of the pulse signal it generates is about 2kV, while the amplitude of the partial discharge ultra-high frequency signal is about tens of volts, and its amplitude cannot meet the detection requirements of the partial discharge ultra-high frequency signal. Requirements; the waveform is a square wave between 10 nanoseconds and 10 microseconds, but the partial discharge UHF signal pulse width is a Gaussian pulse of about tens of nanoseconds

The signal generated by the pulse generator cannot simulate the partial discharge UHF signal of electrical equipment, so the location detection of the partial discharge UHF signal of electrical equipment cannot be performed

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