Six voltage channels (2 three-phase
voltage inputs) come standard with the
SEL-487E. Order in standard terminal
blocks (shown), Connectorized
®
hardware configuration, or the new
Euro connector with low-energy
analog (LEA) voltage inputs. The LEA
IEEE C37.92-2005 voltage measurement interface can be combined with
line voltage sensors and optical voltage
transformers that produce low-level
analog outputs. These eliminate the
need for redundant amplification
electronics between the line voltage
sensor and the relay, reducing
costs and simplifying the system.