VAMP 220 / 220R Arc protection system
User manual
VAMP Ltd
16
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VM220.EN004
Suppose that an arc fault occurs in switchgear B in Figure 2.7-
1, in a situation where circuit-breaker K3 is closed and the
other two infeeding circuit-breakers are open. The arc fault
power is fed via K3 to switchgear C and further to switchgear B
by bus ducts E, A and D. The master unit of the bus duct D
(which trips the circuit-breaker K6) obtains the unidirectional
arc information from the B I/ O bus of the master unit in
switchgear B. In other words, when an arc occurs in switchgear
B, the arc information is forwarded to all master units that
limits that particular zone, independently on their physical
location. In the described infeeding arrangements the pre-
conditions for an arc fault (arc signal and overcurrent) are
fulfilled only in the master unit tripping the circuit-breaker K6.
Therefore, K6 is the only circuit breaker that is tripped.
In this example, the overcurrent BI/O lines are not used.
Figure 2.7-1 Selective arc protection using VAMP 220 master unit
(example).