SOPD Switching Operations 4

Question 1

A 'bus tie breaker' is operated normally closed. During maintenance switching, it is opened to create:

Accepted Answer

A split-bus configuration with each bus served by its own source

Answer

Opening the bus tie breaker separates the double-bus arrangement into two independent radial buses, each fed by its own source.

Question 2

During a high-impedance fault on a distribution feeder, the protective relay may NOT operate automatically. The operator's appropriate response is to:

Accepted Answer

Dispatch field crews to patrol the line and report findings before switching

Answer

High-impedance faults (e.g., downed conductors on asphalt) often do not trip overcurrent relays, requiring field patrol to locate the hazard before switching.

Question 3

The purpose of a 'switching hold' placed by the Energy Control Center is to:

Accepted Answer

Prevent any switching on a specific device or circuit pending system conditions or study results

Answer

A switching hold prevents any operation on the specified device until the ECC removes the hold, typically due to system stability, study, or safety concerns.

Question 4

Switching capacitor banks on a transmission system can produce transient overvoltages. The best mitigation during scheduled switching is to:

Accepted Answer

Use pre-insertion resistors or controlled closing (point-on-wave) switching

Answer

Pre-insertion resistors or point-on-wave controlled closing reduce inrush transients by limiting the rate of voltage change during energization.

Question 5

After completing all steps of a switching order, the operator must:

Accepted Answer

File the order and update the system one-line diagram or EMS model to reflect the new configuration

Answer

Updating the system model or one-line diagram ensures all operators have an accurate picture of the current network configuration.

(SOPD) System Operator/Power Dispatching Practice Test

(SOPD) System Operator/Power Dispatching Practice Test

SOPD Switching Operations 4