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VAMP 221
Arc protection system
Technical description
VAMP Ltd
32
VAMP 24h Technical Support: +358 (0)20 753 3264
VM221.EN013
3.3.1.
Functional system description
The protected installation is an extensive industrial medium-
voltage distribution system comprising two switchgears and
five supplies. The switchgears have longitudinal busbars in a
bus-bar between the inputs. The system also monitors the
auxiliary supply connections, each one of which forms a
separate protection zone. The system comprises two
independent systems connected to each other with a BI/O bus,
which makes it possible to use several protection zones.
To minimize the fault zone, the switchgear is divided into two
separate zones when structurally possible. The different zones
are limited by bus-coupler circuit breakers and monitored by
light sensitive elements (5, 7, 10 and 12). The system receives
current criteria from the central units (1, 2, 3 and 4) and
current I/O unit (8), which have been installed on incomers.
The auxiliary supply connections are monitored by light
sensitive elements (5, 7, 10 and 13).
Switchgear protection has been ensured by wiring the CBFP
contacts to the opposite side of the supply transformers. When
setting the CBFP delay time, the standard break-time of the
feeder circuit breaker of the actual switchgear must be taken
into account. This may be very long for old circuit breakers.
The central units, I/O units and multiplying relays (14, 15, 16
and 17) serve as trip units.
The central unit (1) trips its own feeder circuit breaker and
those between zones 1.1 and 1.2, 1.1 and 1.3, and 1.1 and 2.1 in
zone 1.1 faults (tripping group 1) and serves as CBFP in faults
in these zones (tripping group 1) if the current limit is
exceeded. The trip has been multiplied with a relay (14). In
addition, the central unit (1) trips the circuit breaker between
zones 1.1 and 1.2 in zone 1.2 faults (tripping group 2) if the
current limit is exceeded. CBFP tripping is multiplied for each
feeder circuit breaker with a relay (18).
The central unit (2) trips its own feeder circuit breaker and
those between zones 1.2 and 1.4, 1.3 and 1.4, and 1.4 and 2.4 in
zone 1.4 faults (tripping group 2) if the current limit is
exceeded. The trip has been multiplied with a relay (15). In
addition, the central unit (2) trips the circuit breaker between
zones 1.3 and 1.1 in zone 1.1 faults (tripping group 1) if the
current limit is exceeded.
The central unit (3) trips its own feeder circuit breaker and
those between zones 2.1 and 2.2, 2.1 and 2.3, and 1.1 and 2.1 in
zone 2.1 faults (tripping group 1) and serves as CBFP in faults
in these zones (tripping group 1) if the current limit is
exceeded. The trip has been multiplied with a relay (16). In
addition, the central unit (2) trips the circuit breaker between