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Method for assessing technical parameters of TEV (Transient Earth Voltage) partial discharge testing instruments for power systems

A technology of transient voltage to ground and testing instruments, which is applied in the direction of instruments, testing dielectric strength, measuring devices, etc., and can solve the problems that the evaluation methods have no reference basis and cannot be carried out.

Active Publication Date: 2014-04-16
YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST +1
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Problems solved by technology

[0008] 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 TEV (Transient Earth Voltage) partial discharge testing instruments for power systems
  • Method for assessing technical parameters of TEV (Transient Earth Voltage) partial discharge testing instruments for power systems
  • Method for assessing technical parameters of TEV (Transient Earth Voltage) partial discharge testing instruments for power systems

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Embodiment Construction

[0026] The invention belongs to a method for evaluating the technical parameters of a transient-to-ground voltage partial discharge test instrument for electric power. The feature of the invention is that the method is:

[0027] 1) Lead the sinusoidal analog voltage signal output by the function generator with a fixed value between 0 and 10V and a continuously variable frequency between 0 and 100MHz to a circular metal plate with a diameter not greater than 30cm and effectively insulated from the table. Above, for the measured frequency band curve of the test value of the capacitive-coupled transient-to-earth voltage partial discharge tester as a function of frequency, the maximum value on it is guaranteed to be less than the upper limit of the test instrument's range, and 90% of the maximum value is greater than the instrument without simulation. The background test value under the voltage signal, confirm the continuous frequency band range between the maximum value on the m...

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Abstract

A method for assessing technical parameters of TEV (Transient Earth Voltage) partial discharge testing instruments for power systems is characterized in that a function generator is adopted to output analog sinusoidal voltage signals and analog impulse voltage signals, which are adjustable in amplitude value and frequency; a square wave calibrator is adopted to output analog impulse voltage signals which have higher amplitude value, have the waveform equivalent frequency to be within the range of the effective detection frequency band of a testing instrument, and can generate dozens of hertzes of frequency constantly; analog voltage signals are led to a round metal flat plate which has the diameter of equal to or less than 30 cm and is effectively insulated from a table board; and for TEV testing instruments adopting the manner of capacitance coupling, frequency band and pulse count can be assessed indoors, and sensitivity and rangeability can be assessed in a shielding room. The method 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 electric power equipment, and is especially suitable for the technical field of partial discharge test by transient-to-earth voltage method and detection instrument evaluation. Background technique [0002] Transient-to-ground voltage partial discharge detection technology is based on capacitive coupling, and measures the instantaneous ground-to-ground voltage generated by electrical equipment due to partial discharge on its metal box, so as to determine the degree of partial discharge activity of the equipment and the specific location of the discharge . It can effectively detect 110kV GIS, 3~35kV switch cabinets, switchboards, cable branch boxes, cable terminal boxes and other on-site equipment. of partial discharge. This technical method has the following characteristics: no embedded equipment, direct detection; no external test power supply; no power failure of the tested equip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00G01R31/12
Inventor 王科彭晶谭向宇赵现平董均宇马仪徐肖伟
Owner YUN NAN ELECTRIC TEST & RES INST GRP CO LTD ELECTRIC INST
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