Calibration method and device for gas insulated switchgear (GIS) partial discharge ultrasonic detection device
A technology of ultrasonic detection and partial discharge, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems such as unsatisfactory repeatability, achieve ideal repeatability, avoid human factors, and achieve good calibration repeatability
Active Publication Date: 2013-07-17
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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The key to the calibration of the ultrasonic sensor comparison method is how to obtain a stable and reliable mechanical sound source. At present, methods such as pencil core fracture, capillary glass tube fracture, and steel ball collision are mainly used, and elastic waves are generated by releasing step force. However, these methods It is very easy to introduce many human factors, and the repeatability is not ideal
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[0034] The calibration method of the GIS local discharge ultrasound detection device of the present invention includes the following steps:
[0035] S1 sets the sound transpressor and the benchmark sensor at the original level. The upper and lower surface of the calibration platform with a circular aluminum desktop respectively.In RA3.2, the benchmark ultrasound sensor is placed in the front to place the ultrasonic detector after the front is placed, and the transducer is transmitted to connect the pulse signal source;
[0036] S2 loads the coupling force of not less than 10n on the benchmark sensor and sound transmission switch, and the bubbles between the benchmark sensor and the transpressor and the platform desktop;
[0037] S3 pulse voltage source generates a pulse voltage of less than 1MS and a pulse width of less than 100MS, and the energy coverage of the output signal of the transducer is 20 ~ 300kHz frequency range;
[0038] S4 passes the voltage waveform of the reference...
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A calibration method for a gas insulated switchgear (GIS) partial discharge ultrasonic detection device comprises the steps of applying pulse voltage excitation on a transmitting transducer positioned on one side of a platform to generate ultrasonic vibration, measuring response characteristics of a to-be-detected sensor on the other side of the platform, and achieving sensitivity calibration of the GIS partial discharge ultrasonic detection device. A calibration device special for the method is provided with a round aluminum desktop calibration platform, a reference ultrasonic sensor or the to-be-detected ultrasonic sensor is arranged on the surface of a desktop, the transmitting transducer is arranged on the lower surface of the desktop, the reference ultrasonic sensor and the to-be-detected ultrasonic sensor are connected with the partial discharge ultrasonic detection device through a pre-amplifier, the transmitting transducer is connected with a pulse signal source, and coupling pressing mechanisms are arranged on the upper portion and the lower portion of the desktop. The pulse signal source is utilized to excite the transmitting transducer, and stable calibration ultrasonic pulse signals are generated on the calibration platform to perform sensitivity calibration on the partial discharge ultrasonic detection device. The method is simple and convenient to operate and good in calibration repeatability and is an effective quantitative evaluation method for the GIS partial discharge ultrasonic detection device.
Description
[0001] Technical field [0002] The present invention involves a calibration method for a GIS local discharge ultrasound detection device.The present invention also involves a calibration device for the GIS local discharge ultrasound detection device dedicated to the method. Background technique [0003] Local discharge is the discharge phenomenon that occurs in the part of the medium area of metal closed gas insulation combination (GIS). If the local discharge exists for a long time, it will cause damage to the insulation, which will cause penetration breakdown inside the GIS.The GIS local discharge ultrasound detection device, which is currently widely used in the power grid, can achieve an important role in the detection and accurate positioning of internal discharge during GIS operation, which has a important role in timely discovering the hidden dangers of equipment. [0004] However, the lack of the necessary school verification methods for the sensitivity sensitivity and s...
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IPC IPC(8): G01R35/00
Inventor 李兴旺卢启付高文胜吕鸿陈锐民彭向阳林春耀
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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