Answer / k.prakashchandra

For safety against probable high voltage of primary
appearing in the secondary ,due to either insulation failure
or capacitive coupling between primary and secondary ,as
earthing has reference to the primary voltage.

Answer / tamilarasu

Incase sometimes we want to change the ammeter or any c.t
using relay that time we shorted the s1,s2 tappings. incase
we forget the short of s1,s2.same time c.t burned& it
produce some dangers .so we reduse the danger from c.t
regarding the earthing

Answer / henry vakharia

Current transformers are classified in two categories viz.
protection and measuring classes.
In protection relay, the earth fault is detected from the
earthed terminal or say the common terminal shorted
together and then grounded, which makes the relay detect
the earthfault other than its core function of protecting
equipments from high voltage surges.
In measuring relay, the C.T. is grounded to give protection
from the primary high voltages surges.

Answer / d.lakshmi narayana

IN HT IN CT SECONDARY SOME VOLTAGE GENERATED.THIS IS ACTUAL
CONDITION. IN FAULT CONDITION IT IS INCREASED. ON THT TIME
CURRENT OPERATED COIL IS SOME TIMES IT WAS DAMAGED OR
SUPPOSE U R USING INTEGRATED RELAY SOME TIMES IT WAS DAMASED
THAT'S WHY THE CT SECONDARY IS EARTHED OTHERVICE MORE
VOLTAGE IS COMIG SOME TIMES THE CT OPERATED RELAY WAS
MALFUNCTIONING.
SO CT SECONDARY IS EARTHED

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