Ice NP900 Series, Инструкция по применению

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Application Guide - NP900 Series 427 (504
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A996A
o
Shot 3 started
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Shot 4 started
o
Shot 5 started
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Shot 1 requested by AR1
o
Shot 2 requested by AR1
o
Shot 3 requested by AR1
o
Shot 4 requested by AR1
o
Shot 5 requested by AR1
o
Shot 1 requested by AR2
o
Shot 2 requested by AR2
o
Shot 3 requested by AR2
o
Shot 4 requested by AR2
o
Shot 5 requested by AR2
o
Shot 1 requested by AR3
o
Shot 2 requested by AR3
o
Shot 3 requested by AR3
o
Shot 4 requested by AR3
o
Shot 5 requested by AR3
o
Shot 1 requested by AR4
o
Shot 2 requested by AR4
o
Shot 3 requested by AR4
o
Shot 4 requested by AR4
o
Shot 5 requested by AR4
o
Shot 1 requested by AR5
o
Shot 2 requested by AR5
o
Shot 3 requested by AR5
o
Shot 4 requested by AR5
o
Shot 5 requested by AR5
o
Shots failed
o
Final Trips
o
Shots cleared
o
AR started
The counters are cumulative and update automatically according to the operations of the
autorecloser function.
3.6.5 C
OLD LOAD PICK
-
UP
(CLPU) (68)
Cold load pick-up function (CLPU) is used for detecting the so called “cold load” situations
which relate to the distribution feeder protection after service restoration in which loss of
load diversity has occurred. The characteristics of cold load situation will vary according to
the types of loads of individual feeders. This means that the CLPU stage needs to be set
according to the load type of the feeder it is monitoring specifically. For example in
residential areas where is possibly relatively lot of thermostat controlled apparatus,
heating or cooling machinery which normally run in asynchronous cycles. After power
restoration from longer shortage all of these devices demand full start-up power can
cause the current inrush to be significantly higher than the load current was before the
shortage. In industrial environment this kind of cases are not common since after an
outage the restoration of production process may take up to hours or even days which
after the power consumption will be in the level it was before power outage. It is also