GUID-F30E8D82-95A5-4460-AAEE-BBCD9FAD3FEB V1 EN
Figure 312:
Setpoints Successfully Written To The Control Dialog Screen
6.2.14
Motor current detection and monitoring
The TCC300 includes a tapchanger Motor Current Measurement and Recording feature.
The TCC300 tapchanger control measures the motor current during tapchange operations.
The motor current is sampled at 64 samples per cycle and the total RMS value of the
current is computed every cycle (60 Hz or 50 Hz cycle). The dynamic range of the current
measurement is from 0 to 10 A.
The tapchange start signal is generated when the control begins a Raise or Lower
operation. The tapchange operation is considered complete when the counter contact
input is generated. If the tapchanger is making multiple tapchanges where the current is
not interrupted between tapchanges then the counter contact can be used to decide the
completion of one tap before the start of the next tap.
The Motor Current Monitor feature also includes a Training Mode which will be used
during the commissioning of the tapchanger control. In this mode several tapchange
operations will be manually conducted and the profile stored. This profile will be
compared with the profile during normal tapchange operation to generate alarm signals.
Based on the type of regulator, the counter contact signal will be different:
•
GE: Counter pulse is used to indicate the completion of the tapchange
•
SIEMENS and Howard: State change of the counter contact is used to detect the
tapchange (X 2 setting)
•
Cooper: Motor seal-in current is used to detect the tapchange operation.
The following parameters are logged for the motor current profile and are stored in battery
backed-up RAM for each tapchange:
•
Peak RMS Current
Section 6
1VAC388793-MB A
Configuration
382
TCC300
User Manual
Summary of Contents for TCC300
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