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Application & OT Security · Advanced

Intelligent Electronic Device (IED)

A microprocessor-based controller in power systems, such as a protection relay, that performs control, protection and communication functions.

Definition

IEDs are key components in substation automation and commonly use IEC 61850 and DNP3. Compromise can trip breakers or disable protection functions.

Example

A protection relay IED trips a breaker on a detected fault and reports the event via IEC 61850.

Exam tip

Associate IEDs with electric substations and IEC 61850.

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