GROUNDING TRANSFORMERS [ZN (ZIGZAG), ZNYN, YND(OPEN), II0]

Grounding Transformers are intended to establish an artificial neutral point for ungrounded three phase power systems.

The kVA rating of an earthing transformer is contingent upon the normal line-to-neutral voltage and the magnitude of fault current for a specified duration, typically ranging from seconds to minutes. In the event of line-to-ground faults, these transformers offer a direct path for fault currents to ground, thereby constraining fault currents and transient over-voltages.

Grounding Transformers typically handle short-circuit ground current until the circuit breaker resolves the fault. Consequently, they are equipped with short-time ratings. We have hermetic type, dry type and oil type transformers.

Test List

l  Visual & Dimensional Check

l  Measurement of Voltage Ratio

l  Measurement of Winding Resistance

l  Measurement of Zero Sequence Impedance

l  Measurement of No-Load Loss and Current

l  Measurement of Short-Circuit Impedance and Load Loss

l  Dielectric Tests

l  Separate Source AC Withstand Voltage Test

l  Induced AC Withstand Voltage Test

l  Lightning Impulse Test

l  Temperature Rise Test

l  Final Check

l  For special tests, please contact us.