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Section 5
1MAC050144-MB C
Protection related functions
404
615 series ANSI
Technical Manual
Level detector 2
The measured ground currents are compared with the set
Ground pickup value
. If the
measured value exceeds the set
Ground pickup value
, the level detector reports the
exceeding of the value to the operation mode selector.
Operation mode selector
Depending on the
Operation mode
setting, the operation mode selector makes sure that all
required criteria are fulfilled for a reliable decision of an arc fault situation. The user can
select either "Light+current", "Light only" or "BI controlled" operation mode. The
operation is based on both current and light information in “Light+current” mode, on light
information only in “Light only” mode or on remotely controlled information in “BI
controlled” mode. When the "BI controlled" mode is in use and the
OPR_MODE
input is
activated, the operation of the function is based on light information only. When the
OPR_MODE
input is deactivated, the operation of the function is based on both light and
current information. When the required criteria are met, the drop-off timer is activated.
Drop-off timer
Once activated, the drop-off timer remains active until the input is deactivated or at least
during the drop-off time. The
BLOCK
signal can be used to block the
TRIP
signal or the
light signal output
FLT_ARC_DET
.
5.5.5
Application
The arc flash detector can be realized as a stand-alone function in a single relay or as a
station-wide arc flash detector, including several protection relays. If realized as a
station-wide arc flash detector, 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 flash detector consists of:
• Optional arc light detection hardware with automatic backlight compensation for lens
type sensors
• Light signal output
FLT_ARC_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 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
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
Page 2: ......
Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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