1011-540 5-17-04
Operation
17
S&C Electric Company
BankGuard PLUS
Proprietary Information
Control
Figure 5
System Diagram of BankGuard PLUS Control Device
for Ungrounded Wye-connected Shunt Reactors
Signal Processing
The BankBuard PLUS hardware samples the sensor(s) analog output waveform and then
converts the samples to digital values (Figure 6). The control’s software processes the
digital values using a Discrete Fourier Transform algorithm and compares the results to
the applicable setpoint value. The comparisons are made at 200 millisecond intervals.
Upon completion of the comparisons control action is then taken, if appropriate.
Figure 6
BankGuard PLUS Control Diagram
