Qualitrol 509ITM Series, Manual

Page: 119 / 189

119
www.qualitrolcorp.com
Load Tap Changer Monitor (509ITM-300)
The Load Tap Changer (LTC) Monitor tracks all of the parameters of a load tap system.
Once installed, the monitor performs the following functions to help alert you to immediate or
potential system problems:
•
Measures the present tap position, tap counts, make and break currents, motor
actuations, and motor currents. Monitoring the tap count band can alert you to
incorrect loading, while detecting multiple tap counts signifies incorrect operation.
• Coupled with RTD sensors, measures the differential temperature of the tap changer
with respect to the main tank. This can detect coking of the tap contacts.
• Provides the option of using two alarm priorities to signal if any or all parameters
exceed selected setpoints.
• Provides the option to alarm on excessive actuations or total run time, indicating that it
is time for preventive maintenance.
All of these functions allow you to maximize the use of the implementation of predictive
maintenance and help extend the life of the load tap system.
More Information
• LTC Monitor Requirements and Recommendations for Use
•
LTC Monitor Setup
LTC Requirements and Recommendations for Use
The installation of the Load Tap Changer Monitor depends on the features you would like to
use. The following is a list of requirements and recommendations for various uses of the
Load Tap Changer Monitor.
For general use:
• Required: A Tap Position Input Module to detect tap position. By detecting tap
position, the system can monitor tap counts and tap run time for each position.
For detecting make and break currents for each tap position:
• Required: A Current Input Module to measure system load.
For monitoring the motor controlling the tap position changer:
• Required: A Current Input Module to measure the steady-state current and the inrush
current of the motor.
• Recommended: A Switch Closure Input Module to detect motor actuations. It is
possible to detect motor actuations and motor run time with just a Current Input
Module alone, but a Switch Closure Input Module provides greater system reliability. If
the changer motor uses two relay contacts (one for the positive direction and one for
the negative direction), use two Switch Closure Input Modules.