5
Date Code 20191014
Information Sheet
SEL-734W and SEL-WCS
Product Overview
Phase identification Settings
The SEL-WCS uses two DIP switches to configure the phase information.
shows the phase identification settings.
SEL-734W Settings
The Network ID must match the Network ID setting for the SEL-WCSs used
with this SEL-734W. The other settings on the 734W are explained below.
Voltage Phases
The Voltage Phases setting is used to allow the SEL-734W to calculate power,
VAs, and VARs for all three phases when the SEL-734W is only sensing a single-
phase voltage. This is done by reusing the magnitude of the measured voltage
phase, but rotating by ±120 degrees to get the two missing voltage phases. SW1
of the system setting DIP switches sets this option. When the switch is moved to
the down position, the SEL-734W only has single-phase data available.
Distance to Sensor
The Distance to Sensor setting is used to ensure that an SEL-734W does not hear
data from an SEL-WCS on the system that has reused the Network ID of the
SEL-WCS associated with this SEL-734W. This happens where there are more
SEL-734Ws in a limited area than the 16 available Network IDs. Although
unlikely, under ideal conditions, an SEL-734W can receive data from an
SEL-WCS that is farther than a mile away. This setting reduces the sensitivity of
the SEL-734W radio receiver so it will not receive data from distant SEL-WCSs.
Line Current Range
The Line Current Range setting refers to the maximum current expected to flow
in the line during normal (non-fault) conditions. It is used to increase the resolu-
tion of the current reported to the SEL-734W. When in the > 200 A range, the
resolution is approximately 0.25 A. For the lower range setting, the resolution is
approximately 0.05 A.
Table 3
Phase Identification Configuration
Switch Settings
Phase
00
A
01
B
10
C
11
Reserved
Figure 4
SEL-734W DIP Switch Settings
