SOPD Emergency Response & System Restoration Procedures 2

Question 1

During a widespread blackout, what is the correct sequence for restoring the transmission system?

Accepted Answer

Restore generation, establish transmission backbone, then pick up load

Answer

The standard black start sequence establishes generation and transmission backbone first before incrementally picking up customer load to avoid overloads.

Question 2

A synchronizing check relay (25) prevents closing a breaker when:

Accepted Answer

The frequency difference between two systems exceeds the relay's set threshold

Answer

A sync-check relay monitors voltage magnitude, angle, and frequency difference, blocking closure when the differential exceeds its permitted threshold to prevent a damaging out-of-phase close.

Question 3

What is 'islanding' in power system context during an emergency?

Accepted Answer

A portion of the system operating isolated from the main grid, potentially with uncontrolled frequency

Answer

Islanding occurs when a section of the power grid continues to operate independently after separation from the main grid, which can create unsafe frequency and voltage conditions.

Question 4

Under NERC EOP-005, what must operators verify before energizing a transmission line during restoration?

Accepted Answer

That protection systems are in service and the line is clear of work tags

Answer

EOP-005 requires operators to confirm protection systems are in service and the element is free of clearances/tags before energizing during system restoration.

Question 5

When frequency drops below the first stage of an Under-Frequency Load Shedding (UFLS) scheme, the scheme automatically:

Accepted Answer

Disconnects a pre-set block of customer load to arrest the frequency decline

Answer

UFLS automatically trips pre-programmed load blocks to reduce demand and arrest frequency decline when it falls below defined thresholds.

(SOPD) System Operator/Power Dispatching Practice Test

(SOPD) System Operator/Power Dispatching Practice Test

SOPD Emergency Response & System Restoration Procedures 2