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[dw_light-and-current, 2, en_US]
Figure 6-93
For this example, the following is assumed:
•
The current-flow criterion offers additional security to prevent unwanted tripping caused by sudden light
influences.
Depending on the arc location in the cable-connection compartment of the feeder, it is not always
possible to measure the current. If an arc is detected in the cable-connection compartment of the feeder,
the current will therefore be evaluated in the infeed.
•
Install the optical point sensors in the busbar compartment, the circuit-breaker compartment, and the
cable-connection compartment of the feeders as well as the busbar compartment of the infeed. Connect
the optical point sensors to the protection device in the infeed.
•
The protection device in the infeed clears all arcs in the busbar compartment, the circuit-breaker
compartment, and the cable-connection compartment of feeder 1 and 2. Furthermore, the protection
device clears arcs in the busbar compartment of the infeed.
•
If the optical point sensors in the busbar compartment, the circuit-breaker compartment, and the cable-
connection compartment of the feeders, or in the busbar compartment of the infeed detect an arc, the
protection device in the infeed evaluates the current as well.
•
If an arc occurs in the circuit-breaker compartment and in the cable-connection compartment of the
infeed, the superordinate protection device must trip.
NOTE
i
i
If the Arc protection function operates with the Operating mode = current and light, the addi-
tional current-flow criterion prevents unwanted tripping caused by external light influences.
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Layout and Connection of the Optical Point Sensors (Operating Mode = Current and Light)
Protection and Automation Functions
6.10 Arc Protection
511
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