stand by earth fault protection (51G) for transformer rating 2000 kVA,Dyn11,33/0.400 V. LV NCT ratio and necessary resistor and metrosil values how to calculate
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Answer Posted / Poornima Yadav
{"earth": "To calculate the standby earth fault protection (51G) for a transformer with a rating of 2000 kVA, Dyn11, 33/0.400 V, you can follow these steps:
1. Determine the LV NCT ratio (NCT = Number of poles x Transformer voltage).
2. Based on the transformer rating and the NCT ratio, find the corresponding standard value for the 51G earth fault protection relay in the manufacturer's technical data.
3. Calculate the necessary resistor values by referring to the relay manufacturer's data or using a specialized calculation tool.
4. To calculate the required Metrosil value, consult the relay manufacturer's data sheet and select the appropriate Metrosil type for your specific application."
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