Method for assessing technical parameters of narrow-band non-contact ultrasonic partial discharge testing instruments for power systems

A testing instrument and narrow-band technology, which is applied in the field of narrow-band non-contact ultrasonic partial discharge testing and testing instrument evaluation, can solve the problems that cannot be carried out, and the evaluation method has no reference basis, etc.

Active Publication Date: 2012-08-29
YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
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Problems solved by technology

[0007] At present, there is no reference basis for the evaluation method of key parameters of this type of testing instrument, and it is basically impossible to carry out

Method used

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  • Method for assessing technical parameters of narrow-band non-contact ultrasonic partial discharge testing instruments for power systems
  • Method for assessing technical parameters of narrow-band non-contact ultrasonic partial discharge testing instruments for power systems
  • Method for assessing technical parameters of narrow-band non-contact ultrasonic partial discharge testing instruments for power systems

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Embodiment Construction

[0021] The invention belongs to a method for evaluating technical parameters of a narrow-band non-contact ultrasonic partial discharge testing instrument for electric power, which is characterized in that the method is:

[0022] (1) Use the sinusoidal analog voltage signal output by the function generator to continuously change the amplitude of 0-10V and the frequency is 40kHz to drive the narrow-band ultrasonic transmitter to generate spatial ultrasonic waves with variable radiation power, at a fixed distance of 2-3m, and facing The position of the ultrasonic transmitter, the analog voltage signal amplitude corresponding to the difference between the test value of the ultrasonic test instrument using a narrow-band non-contact method and the test value when there is no analog voltage signal is within the range of 5% to 8% of the test instrument range The value is measured, the smaller the analog voltage signal of the test, the higher the sensitivity of the instrument;

[0023]...

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Abstract

A method for assessing technical parameters of narrow-band non-contact ultrasonic partial discharge testing instruments for power systems is characterized in that sinusoidal analog voltage signals which are outputted by a function generator, are adjustable in amplitude value and have the frequency of 40 kHz are used for driving a narrow-band ultrasonic emitter to generate space ultrasonic waves of which the radiant power can change in the forward direction; and for an ultrasonic testing instrument adopting a narrow-band non-contact manner, the sensitivity amplitude value, the directional included angle, the effective testing distance, the rangeability and other technical parameters are assessed practically. The method is combines the characteristic of integrative packaging number value display of a narrow-band non-contact ultrasonic partial discharge testing instrument, starts with the spread principle of space ultrasonic radiation, aims at the core technical parameters such as sensitivity, directionality, attenuation characteristic and rangeability, utilizes the function generator to solve the assessment problem of such equipment from the angle of space ultrasonic radiation, and has the remarkable advantages of portability, intuitiveness, accuracy, quantification, capability of repetition measurement, and the like.

Description

technical field [0001] The invention belongs to the field of partial discharge detection of power equipment, and is especially suitable for the technical field of narrow-band non-contact ultrasonic partial discharge test and detection instrument evaluation method. Background technique [0002] Insulation defects in electrical equipment can lead to partial discharges, which manifest themselves in the form of sound, electricity, light, and gas decomposition. Compared with the electromagnetic detection method, the sound measurement method is more sensitive to the type of medium, and is especially suitable for the discharge of the surface type of the medium, such as the surface discharge of conductors, insulators, insulating pads, etc. that are in direct contact with air, oil, and SF6 gas. [0003] The essence of the sound measurement method is that the discharge source causes the surrounding gas molecules to vibrate, and through a wave transmission process, the vibration signal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 王科彭晶谭向宇董均宇赵现平马仪陈磊
Owner YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST
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