BE1-25 Glossary
Type A target
The seventh character of the relay Style Number designates the target type. Type A is an internally
operated target.
Type B target
The seventh character of the relay Style Number designates the target type. Type B is a current operated
target.
Voltage difference (Peak Detector)
Voltage difference is equal to the monitored bus voltage times the sine of theta when theta is equal to the
phase angle formed by the bus voltage and line voltage phasors. Available with the Voltage Monitor
Option 2-R, 2-T and 2-U.
Voltage difference (Average Detector)
Voltage difference is equal to the monitored bus voltage minus the monitored line voltage. Available with
the Voltage Monitor Option 2-A, 2-B and 2-C.
Voltage monitor
The ninth position of the Style Number defines the Voltage Monitor Option 2:
N)
None. With this selection, the third position of the Style Number (Output options) must be either E
or F.
A)
Average Voltage Monitor and Voltage Difference with PCB mounted switches
B)
Average Voltage Difference.
C)
Average Voltage Monitor and Voltage Difference with External Contact Inputs to control the
Condition Switches. This option requires the voltage dropping Resistor Module.
R)
Line and Bus Voltage Monitor and Voltage Difference with PCB mounted switches
S)
Line and Bus Voltage Monitor with PCB mounted switches
T)
Voltage Difference. With this selection, the third position of the Style Number (Output options)
must be either E or F.
U)
Line and Bus Voltage Monitor and Voltage Difference with External Contact Inputs to control the
Condition Switches. This option requires the voltage dropping Resistor Module.
V)
Line and Bus Voltage Monitor and External Contact Inputs to control the Condition Switches This
option requires the voltage dropping Resistor Module.
Zero cross detection circuits
Each time that the input ac signal crosses through the zero reference voltage as it is going from negative
to positive, a pulse is generated that marks the start of the ac signal.
www
. ElectricalPartManuals
. com
