Application; Signals - ABB RELION SMU615 Technical Manual

Supervision functions
is deactivated or at least during the drop-off time of 25 ms. The BLOCK signal can be
used to block the arc detection output ARC_FLT_DET.
5.4.5

Application

The arc detection information from this function can be used in the standalone
devices, for an alarm or protection logic. Also this information can be also be
utilized in centralized solutions, for station-wide arc protection scheme. The arc
detection 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 the protection device
The light from an arc is detected locally, by lens sensors connected to inputs
Light sensor 1, Light sensor 2 or Light sensor 3 on the communication module
of the merging unit. The lens sensors can be placed, for instance, 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. Inputs Light sensor 1, Light sensor 2 and Light sensor 3 have their
own reference levels. When the reference level of one of the inputs is exceeded, light
has been detected.
The light signal output from an arc detection stage ARC_FLT_DET is activated
immediately in the detection of light in all situations. A centralized arc protection
solution is realized by routing the light signal output to an output contact
connected to a binary input of the protection device, or by routing the light signal
output through the communication.
5.4.6

Signals

5.4.6.1 ARCDSARC Input signals
Table 191: ARCDSARC Input signals
Name
BLOCK
162
Cover unused inputs with dust caps.
Type
BOOLEAN
Default Description
0=False Block signal for all binary out-
puts
1MRS758407 C
SMU615
Technical Manual