2
SEL-734W and SEL-WCS
Information Sheet
Date Code 20191014
Product Overview
option for no calculation of the harmonics, the sensor will send updates more fre-
quently (for line currents below 200 A).
compares typical update periods
with and without harmonics calculation for certain values of line current.
Product Overview
SEL-WCS
depicts the key components of the SEL-WCS. Each SEL-WCS mounts
onto and monitors the line current on one phase. The SEL-WCS periodically
sends the load data information including the harmonics to a SEL-734W.
Shotgun Stick Loop and Spring
The shotgun stick loop allows the SEL-WCS to be mounted on the line or
removed from the line using only a shotgun stick. The springs simplify installa-
tion on overhead lines and hold the SEL-WCS in position. See
for more information.
Current Transformer (CT)
The SEL-WCS split-core CT harvests energy to power the device and accurately
measure load current and harmonics of the current.
Table 1
WCS Typical Update Period Versus Line Current
Line Current
(amps rms)
No-Harmonics Update Period
(seconds)
Harmonics Update Period
(seconds)
2
20
64
5
4.1
12.5
10
2.0
5.7
20
1.1
2.0
50
1.1
1.4
100
1.1
1.3
Figure 1
SEL-WCS Key Components
Shotgun Stick Loop
Current Transformer
Twistlock Housing
for Setting Access
Omnidirectional Antenna for
the Radio Transmitter
Control (DIP)
Switch Bank
Spring for Secure Installation
