Schweitzer Engineering Laboratories SEL-734W, Field Reference Manual

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4.3
Date Code 20191029 Field Reference Guide SEL-734W and SEL Wireless Current Sensor
SEL-734W
Front-Panel Operations
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 control (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-734W enclosures 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-WCS devices. For most installations that do not require distance greater
than 200 feet, this should be set to low to avoid creating unnecessary RF noise,
which can overdrive the receiver.
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 greater than the 200 A
range, the resolution is approximately 0.25 A. For the lower range setting, the
resolution is approximately 0.05 A.
Front-Panel Operations
LEDs
Table 4.1 describes the behavior of the six front-panel LEDs. See the explanation
of the pushbutton LEDs in Pushbuttons .
Figure 4.2 SEL-734W DIP Switch Settings