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IDMT relays are used to protect the power transformers against
![](data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20933%201024%22%3E%3C/svg%3E)
(a) external short circuits.
(b) overloads.
(c) internal short-circuits.
(d) external short circuits and overloads.
ANSWER:
(d) external short circuits and overloads.
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