SOPD Emergency Response & System Restoration Procedures 5

Question 1

When restoring service after a fault, before reclosing a breaker a system operator should confirm:

Accepted Answer

The fault has been cleared and the protection system has reset

Answer

Before reclosing, operators must verify the fault has been physically cleared (e.g., by field crew confirmation) and that protective relays have reset to prevent re-tripping onto a live fault.

Question 2

An Emergency Action Level (EAL) framework in nuclear plant coordination requires system operators to:

Accepted Answer

Notify the plant's control room when grid conditions could affect the plant's offsite power supply

Answer

System operators maintain hotlines with nuclear plants and must notify them of grid emergencies that could degrade or interrupt the reliable offsite power supply required by NRC regulations.

Question 3

What is 'controlled islanding' as a defense against cascading outages?

Accepted Answer

Intentionally splitting the grid into pre-planned self-sufficient islands to arrest cascade propagation

Answer

Controlled islanding intentionally separates the system at pre-selected boundaries where generation and load are approximately balanced, containing the disturbance within one island rather than allowing it to topple the entire interconnection.

Question 4

A system operator must issue a 'Public Appeal for Conservation' under which condition?

Accepted Answer

When voluntary demand reduction is needed to maintain adequate reserves during a supply emergency

Answer

Public conservation appeals are issued when generation reserves are critically low and voluntary demand reduction can help avert forced load shedding.

Question 5

During system restoration, why must operators carefully monitor transformer inrush current?

Accepted Answer

High magnetizing inrush can falsely operate differential relays and trip the transformer off-line

Answer

Transformer energization produces a large transient magnetizing current (inrush) that can look like an internal fault to differential protection, causing a false trip and interrupting the restoration sequence.

(SOPD) System Operator/Power Dispatching Practice Test

(SOPD) System Operator/Power Dispatching Practice Test

SOPD Emergency Response & System Restoration Procedures 5