Ice AP902, Инструкция по эксплуатации

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Instruction manual – AP902 Arc Protection Unit 18 (35
)
A1008B
6 A
PPLICATION EXAMPLES
AP902 may be applied to a variety of power switchgear and controlgear layouts and
technologies. Some typical applications are described in this section. Please consult your
nearest ICE representative for a solution to your particular application.
6.1 MV
OR
LV
APPLICATION WITH CURRENT AND LIGHT CONDITION
AP902 may be applied requiring both overcurrent and arc light conditions for trip. In this
case tripping is performed only if both conditions are fulfilled simultaneously. Typically the
overcurrent condition is obtained from the AP910 unit and the trip relay will be activated in
7ms. The overcurrent condition may be monitored by non-ICE products also (e.g. generic
feeder protection relay) and the total operation time is then dependent on device feeding
the overcurrent signal to AP902.
The sensor channel S1 can be set to operate on light only even if other channels operate
on both conditions of arc light and overcurrent.
Figure 6-1
shows an example of a system applying both overcurrent and arc light for
tripping from the fiber sensor channels S2 and S3 activations and arc light only from fiber
sensor channel S1 activation. S1 channel is monitoring the transformer feeder bus duct
above the current monitoring point. S2 channel is monitoring the main breaker and the
busbar. S3 channel is monitoring each feeder. For the maximum length of each fiber
sensor type refer to “ Arc Sensors Series - Instruction booklet”.
The current monitoring signal is in this application coming from an external overcurrent
relay.