Calibration method and device for a gis partial discharge ultrasonic detection device
A technology of ultrasonic detection and partial discharge, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve problems such as unsatisfactory repeatability, achieve ideal repeatability, good calibration repeatability, and avoid human factors.
Active Publication Date: 2015-08-05
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology
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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[0033] The calibration method of the GIS partial discharge ultrasonic detection device of the present invention comprises the following steps:
[0034] In S1, the acoustic emission transducer and the primary calibrated reference sensor are respectively placed at the center of the upper and lower surfaces of a calibration table with a circular aluminum table top. The diameter-thickness ratio of the aluminum table top should be greater than 20, and the surface finish should not be low. At Ra3.2, the reference ultrasonic sensor is connected to the partial discharge ultrasonic detector after the preamplifier, and the transmitting transducer is connected to the pulse signal source;
[0035] S2 Load the coupling force of not less than 10N on the reference sensor and the acoustic emission transducer respectively, and empty the air bubbles between the reference sensor and the acoustic emission transducer and the platform table;
[0036] The S3 pulse voltage source generates a pulse vo...
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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
technical field [0001] The invention relates to a calibration method of a GIS partial discharge ultrasonic detection device. The invention also relates to a calibration device of the GIS partial discharge ultrasonic detection device specially used for the method. Background technique [0002] Partial discharge is a discharge phenomenon that occurs in a local area of a metal-enclosed gas-insulated combined electrical appliance (GIS). If partial discharge exists for a long time, it will cause insulation damage, resulting in a penetrating breakdown inside the GIS. At present, the GIS partial discharge ultrasonic detection device widely used in the power grid can realize the detection and accurate positioning of internal discharge during GIS operation, and plays an important role in timely discovering hidden dangers of equipment. [0003] However, there is currently a lack of necessary calibration methods to quantitatively test and evaluate the sensor sensitivity and system d...
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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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