Abstract
This article offers an alternative method of calibrating partial discharge meters for research and teaching purposes. Most current modern calibrators are implemented as precise voltage pulse sources with a coupling capacitor. However, our calibrator is based on the physical principles of dielectric materials distributed in a plane or space. Calibrator design is unique and there is an attempt to get closer to the behavior of the measured real objects. The calibration impulses are created by energy from a high voltage power supply at the specific or nominal value of the applied voltage. At the same time, it is possible to simulate the value and quantity of the discharges and their position in the object relative to the input electrodes. The calibrator creates conditions as a real measured object with adjustable parameters. This paper describes a design of this type of calibrator, its implementation, numerical simulation of discharge values and laboratory measurements with functional verification using the Tettex 9520 calibrator and galvanic measured system DDX 7000/8003 and DDX 9121b. All measurements are carried out using the CVVOZEPowerLab Research Infrastructure equipment.
Highlights
Measurement of partial discharges (PD) is nowadays conventionally used as the diagnostic method for medium and high voltage electrical devices [1]
The suppression of interference from the surroundings is allowed by the pulse discrimination system (PDS), which are based on eliminating signals not coming from the tested objects
PD calibrators developed in our laboratory meet the following parameters
Summary
Measurement of partial discharges (PD) is nowadays conventionally used as the diagnostic method for medium and high voltage electrical devices [1]. The method is primarily intended for the measurement of insulation quality and localization of isolation defects in MV and HV cables, instrument transformers and rotating machines. Research in this field is still ongoing and the full use of PD diagnostic methods is a matter of the future [2]. Internal partial discharges occur in all tested objects from the initial voltage value and they are the most often created at sites of mechanical isolation faults, in the areas of material impurities, mechanical cracks and gas bubbles [4]. The defined fault in the test object causes a PD with a certain charge value, amplitude symmetry and phase spectrum depending on the applied voltage value. The circuit is simulated in the Electronic Workbench software and the static state calculations before and during the fault are performed in Matlab Simulink software
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