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  3. Volume 4, Number 1, 2022
  4. Online insulation monitoring system for high voltage bushings 330 kV

Online insulation monitoring system for high voltage bushings 330 kV

SEPES.
2022;
Volume 4, Number 1
: pp. 15 - 23
https://doi.org/10.23939/sepes2022.01.015
Authors:
  1. Andriy Yatseiko
  2. Zinoviy Bakhor
1
Lviv Polytechnic National University
2
Lviv Polytechnic National University

Insulating structures of high-voltage electrical equipment are exposed to electromagnetic fields, atmospheric factors, natural aging processes and more. The consequence of this is the deterioration of their dielectric properties, damage to the insulating structure, which often leads to explosions, fires, injuries to staff. Therefore, the use of informative, reliable and safe diagnostic systems is an important operational task. The main disadvantages of existing electrical insulation diagnostics systems, especially online diagnostics, are the significant impact on the results of measurements of electromagnetic interference of electrical installations. The article considers the system of online monitoring of insulation of high-voltage bushings 330 kV, the principle of which is based on direct current and offers the concept of building such a diagnostic system. A digital model of 330 kV high-voltage bushing insulation has been developed, which reproduces the processes in its paper-oil insulation construction under the influence of the main operational factors.

Deterioration of high-voltage bushing insulation, influence of temperature and humidity change, partial overlaps between additional leveling plates are investigated. The basic diagnostic parameter of control of a condition of isolation of high-voltage bushing is chosen. This is a DC voltage across the reference resistor. Monitoring the voltage  on the reference  resistor  will allow timely and reliable assessment of deterioration of the insulation characteristics of the bushing and prevent the development of accidents. The use of direct current eliminates the influence of parasitic currents and interference of the existing electrical installation on the measurement results. The structural scheme of the system of online monitoring of insulation of high-voltage bushings of 330 kV is offered.

online monitoring
diagnostics
high-voltage bushing
digital model
insulating construction
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