1MAC050144-MB C
Section 5
Protection related functions
615 series ANSI
405
Technical Manual
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 flash detector 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 flash detector stage
FLT_ARC_DET
is activated
immediately in the detection of light in all situations. A station-wide arc flash detector 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 flash detector stage
with a binary input or a signal from another function block.
Arc flash detector with one IED
In installations, with limited possibilities to realize signalling between IEDs protecting
incoming and outgoing feeders, or if only the IED for the incoming feeder is to be
exchanged, an arc flash detector with a lower protective level can be achieved with one
protection relay. An arc flash detector with one IED only is realized by installing two arc
lens sensors connected to the IED protecting the incoming feeder to detect an arc on the
busbar. In arc detection, the arc flash detector stage trips the circuit breaker of the
incoming feeder. The maximum recommended installation distance between the two lens
sensors in the busbar area is six meters and the maximum distance from a lens sensor to
the end of the busbar is three meters.
Cover unused inputs with dust caps.
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
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Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
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