4.9.5
Application
The arc protection can be realized as a stand-alone function in a single relay or as a station-
wide arc protection, including several protection relays. If realized as a station-wide arc
protection, different tripping schemes can be selected for the operation of the circuit
breakers of the incoming and outgoing feeders. Consequently, the relays in the station can,
for example, be set to trip the circuit breaker of either the incoming or the outgoing feeder,
depending on the fault location in the switchgear. For maximum safety, the relays can be
set to always trip both the circuit breaker of the incoming feeder and that of the outgoing
feeder.
The arc protection consists of:
•
Optional arc light detection hardware with automatic backlight compensation for lens
type sensors
•
Light signal output
ARC_FLT_DET
for routing indication of locally detected light
signal to another relay
•
Protection stage with phase- and ground-fault current measurement.
The function detects light from an arc either locally or via a remote light signal. Locally,
the light is detected by lens sensors connected to the inputs Light sensor 1, Light sensor
2, or Light sensor 3 on the serial communication module of the relay. The lens sensors can
be placed, for example, in the busbar compartment, the breaker compartment, and the
cable compartment of the metal-clad cubicle.
The light detected by the lens sensors is compared to an automatically adjusted reference
level. Light sensor 1, Light sensor 2, and Light sensor 3 inputs have their own reference
levels. When the light exceeds the reference level of one of the inputs, the light is detected
locally. When the light has been detected locally or remotely and, depending on the
operation mode, if one or several phase currents exceed the set
Phase pickup value
limit,
or the ground-fault current the set
Ground pickup value
limit, the arc protection stage
generates a trip signal. The stage is reset in 30 ms, after all three-phase currents and the
ground-fault current have fallen below the set current limits.
The light signal output from an arc protection stage
ARC_FLT_DET
is activated
immediately in the detection of light in all situations. A station-wide arc protection is
realized by routing the light signal output to an output contact connected to a binary input
of another relay, or by routing the light signal output through the communication to an
input of another relay.
It is possible to block the tripping and the light signal output of the arc protection stage
with a binary input or a signal from another function block.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
743
Technical Manual
Summary of Contents for Relion 615 series
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