Electrical power engineeringCondition Assessment and monitoring of High Voltage Equipment
Condition assessment and monitoring of high voltage equipment
The ecologically and economically desirable transition from event or time-based maintenance to condition and risk-based maintenance requires a most accurate condition assessment of the electrical equipment. Asset managers of high voltage equipment examine the current condition with regard to aging, remaining service life and probability of failure in order to determine and plan the necessary maintenance measures and replacement investments. Depending on the insulation systems used in the high voltage component, the appropriate measurement and diagnostic methods for evaluating the condition and detecting faults must be selected.
We employ a range of electrical diagnostic methods for condition assessment and monitoring. Furthermore, we propose, help to choose and perform the most suitable measurements and evaluation methods for the respective equipment and our customers’ requirements and preferences.
- Proposal of most suitable measurement methods and procedures for the condition assessment of a wide range of high voltage components
- Dissipation factor and capacity measurements at a frequency of 50 Hz and as a function of voltage (tip-up test from 0 to 12 kV) and frequency (20‑400 Hz)
- Winding resistance measurement and dynamic resistance measurement on tap changers (dyn. OLTC scan)
- Short-circuit impedance and frequency response of stray losses (FRSL)
- Sweep frequency response analysis (SFRA)
- Transformer turns ratio and vector group check
- Measurement of the magnetizing current
- Hysteresis measurement
- Evaluation of the measurement results according to the existing standards, guidelines, and experiences as well as implementation of requested evaluation methods
- Partial discharge measurement