Tap changers are used to regulate the voltage of the bank
load side
What are the two types of Tap Changers
No Load Tap Changers
Load Tap Changers
What Tap Changers are most commonly used on distributing
station banks
No Load Tap Changers
True/False
No Load Tap Changers require that the bank be cleared up and grounded to change the taps.
True
True/False
These tap changers require that the bank be cleared up
to change the taps.
True
True/False
LRC (Load Ratio Control) banks are used in place of voltage regulators on the feeders
True
What are three major components to a tap changer
Motor Drive Mechanism
Tap Changer Assembly
Tap Connections to the Bank Winding
The tap changer assembly consists of a:
Tap Selector
Contactor
Vacuum Interrupter
Control power for the Tap Changer Assembly system is supplied from
station service
Regarding LTCs, the simulates the
impedance of the circuit
line-drop compensator
True/False
In LTCs, the simulated line-drop from the compensator is subtracted from the potential transformer secondary voltage, the results are applied to the voltage sensor
True
The Operator Control Panel typically contains
Circuit breaker for the drive power
Tap indicator with drag hands
Auto/Manual switch
Raise/Lower switch
Remote/Local switch
How does the indicator receive tap position information
from the drive motor
assure that the drive motor does not travel past
predetermined limits
Limit switches
True/False
Tap changers can be operated automatically, manually as a group (all three phases of the transformer), or manually at each individual phase
True
The bandwidths used are between volts on a 120-volt scale.
1.5 and 3.0
The time delay is adjustable from 10 through 90 seconds. The time delay is typically set for