TESTING OF SWITCHYARD EQUIPMENTS

TRANSFORMERS

Offline:

• Magnetic Balance test
• Insulation resistance & polarization Index, Dielectric Absorption Ratio
• No Load Loss & Current
• Short circuit impedance & Load Loss at low voltage
• Turns Ratio
• Voltage ratio & check of phase displacement
• Winding resistance
• Sweep frequency response analysis (SFRA)
• Magnetization current at low voltage
• C and Tan delta power factor measurement of transformer winding and Bushings

Online:

• Partial Discharge Test
• Thermography

CIRCUIT BREAKERS

• Insulation Resistance Test
• Contact Resistance Test
• Time Interval Test (Opening, Closing,Close-Open)
• DCRM

CURRENT TRANSFORMERS/VOLTAGE TRANSFORMERS

• Insulation Resistance Test
• Capacitance and Tan Delta Test
• Ratio Test
• Polarity Test
• Winding Resistance Test