In distance protection, the relay measures _________.

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RRB Paper · Accepted Answer

In distance protection, the relay measures positive sequence impedance of the line from relay up to the fault point. Distance protection is a type of protective relay used in power systems to detect and isolate faults on transmission lines. The distance relay measures the impedance of the line and compares it to a predetermined setting. If the measured impedance exceeds the setting, the relay will trip the associated circuit breaker to isolate the fault. The positive sequence impedance is the impedance seen by the positive sequence components of voltage and current. This impedance is typically used in distance protection schemes because faults on transmission lines generally involve only the positive sequence components.

In distance protection, the relay measures _________.

Positive sequence impedance of the line from relay up to the fault point

Self-impedance of the line from relay up to the fault point

Negative sequence impedance of the line from relay up to the fault point

Zero sequence impedance of the line from relay up to the fault point

The correct answer is `No. 1: Positive sequence impedance of the line from relay up to the fault point`

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In distance protection, the relay measures _________.

Positive sequence impedance of the line from relay up to the fault point

Self-impedance of the line from relay up to the fault point

Negative sequence impedance of the line from relay up to the fault point

Zero sequence impedance of the line from relay up to the fault point

The correct answer is No. 1: Positive sequence impedance of the line from relay up to the fault point

The correct answer is `No. 1: Positive sequence impedance of the line from relay up to the fault point`