SV500 monitors transformers. Failure impacts and diagnostic indicators are listed below.
Stress
- Failure impact
- Insulation degradation, shorter service life, performance loss
- Diagnostic indicators
- Harmonic load factor (FHL/K-factor), overcurrent, V/I crest factor
Capacitors
- Failure impact
- Lower power factor, more losses, voltage instability, system stress
- Diagnostic indicators
- Transient voltage and current events, capacitor overcurrent
Ground fault (Y)
- Failure impact
- Equipment damage, shock risk, system instability
- Diagnostic indicators
- Residual and zero-sequence components, ground fault ratio
Bushings
- Failure impact
- Insulation breakdown, discharge, insulation failure
- Diagnostic indicators
- Interruption, sag and swell events, insulation abnormalities, surface discharge
Tap changer
- Failure impact
- Abnormal voltage regulation, contact failure, transformer damage
- Diagnostic indicators
- Interruption, transient, sag and swell events
Windings
- Failure impact
- Complete failure, outages, equipment damage, lower efficiency
- Diagnostic indicators
- Park vector, even-order harmonic voltages, voltage imbalance, negative/zero sequence, phase angle
Core
- Failure impact
- Core loss, overheating, higher magnetizing current
- Diagnostic indicators
- No-load condition, excitation current distortion and harmonics