Schweitzer Engineering Laboratories SEL-751 - Figure 2.37 Point-Sensor Directivity (0-360° Around the Mounting Plane); Figure 2.38 Point-Sensor Directivity (Front to Back, above the Mounting Plane)

2.44
SEL-751 Relay Instruction Manual Date Code 20170927
Installation
Arc-Flash Protection: System Installation
The point sensor is omnidirectional with a slight loss of sensitivity at the fiber
entry point. Figure 2.37 through Figure 2.39 show the sensor directivity
pattern. The point sensor must be located in clear view of the energized parts,
which are most likely to cause an arc-flash event.
Figure 2.37 Point-Sensor Directivity (0–360° Around the Mounting Plane)
Figure 2.38 Point-Sensor Directivity (Front to Back, Above the Mounting
Plane)
120%
100%
80%
60%
40%
0°
350° 10°
340° 20°
330° 30°
320° 40°
310° 50°
300° 60°
290° 70°
280° 80°
270° 90°
260° 100°
250° 110°
240° 120°
230° 130°
220° 140°
210° 150°
200° 160°
190° 170°
180°
120%
100%
80%
60%
40%
0°
350° 10°
340° 20°
330° 30°
320° 40°
310° 50°
300° 60°
290° 70°
280° 80°
270° 90°
260° 100°
250° 110°
240° 120°
230° 130°
220° 140°
210° 150°
200° 160°
190° 170°
180°