TEST OF POWER TRANSFORMERS
High Voltage Power Transformer Testing
HV / EHV TRANSFORMERS
On-site Diagnostic Testing of HV / EHV class of Transformers:
Our experience spans across power transformers of all voltage class upto 1200 kV and rating upto 500 MVA.
- Voltage Ratio and Vector group confirmation test,
- Frequency Response Analysis (FRA),
- No-load excitation current measurement
- Capacitance and dissipation factor measurement of the inner insulation
- Capacitance and dissipation factor measurement of high-voltage bushings
- Impedance measurements (short-circuit impedance, zero sequence impedance, FRSL method)
- Analysis of winding damages with the FRA method
- Moisture analysis of paper insulation by dielectric method (PDC+ FDS).
- OLTC operation and dynamic contact resistance measurement
- Winding Resistance Measurement
- Thermography , Noise , Vibration Measurement
- Routine Oil test, DGA, Furan
- DP test of paper insulation.
- On line & Off line Partial discharge measurements of transformers
CURRENT TRANSFORMERS
On-site Testing of the HV/EHV class of Current Transformers
It is intended to perform automatic testing by CT Analyser on-site for utilities with very less testing time or by Primary injection test. The following tests can be performed:
- Burden & CT winding resistance measurement
- CT excitation characteristics according to IEC 60044-1, IEC 60044-6 (TPS, TPX, TPY) and IEEE C57.13. for knee-point voltages (up to 15 kV).
- CT ratio & phase angle error measurement
- CT phase and polarity measurement
- Determination of accuracy limiting factor, instrument security factor,
- Test of CTs for knee-point voltages (up to 15 kV).
- Capacitance and dissipation factor measurement of the inner insulation
- Capacitance and dissipation factor measurement of high-voltage bushings
- Moisture analysis of paper insulation dielectric method (PDC+ FDS)
- DGA test of oil.
- On line & Off line Partial discharge measurements of CT.
CVT & PT
On-site Testing of the HV/EHV class of Potential Transformers and CVTs
- Capacitance and dissipation factor measurement
- Primary injection & Ratio test.
- Moisture analysis of paper insulation by dielectric method (PDC+ FDS).
- IR value with Polarization Index (PI) & Absorption Index (AI),
- DC Resistance measurement
On line & Off line Partial discharge measurements.
