
4-2
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
Safety Considerations: First Trip/Close Tests
First Trip/Close testing involves connecting control cabinet cables to a
live circuit breaker. Under no circumstances are Contact Monitor cables
(EHV or OCB) used during First Trip/Close tests.
For a First Trip/Close test, connections are made in the circuit breaker
control cabinet while the breaker is still energized. During a time when
the circuit breaker is de-energized, it is desirable to make some
adjustments that facilitate First Trip/Close connections, such as adjusting
wiring to accommodate clip-on probes. Doble does not recommend
connecting a motion transducer to an energized breaker. To include the
measurement of the motion characteristics of a circuit breaker in the First
Trip/Close tests, Doble does, however, recommend finding a spot on the
circuit breaker's mechanism and permanently installing a motion
transducer
while the breaker is de-energized
.
For safety reasons, Doble also recommends that the circuit breaker be
operated remotely and that the tester be set up to use the external trigger
feature of the TDR9000. This guide outlines the First Trip/Close Test using
an external trigger only.
First Trip/Close Virtual Front Panel Configuration
Some special considerations exist when configuring for a First Trip/Close
test. The following areas of the Test Plan or Virtual Front Panel must be
configured:
• The Nameplate information must include at least the
Manufacturer, Model Number, Serial Number, Special ID, if any,
and Location. A note in the Version Description field indicating
that the Test Plan is for use with First Trip/Close tests is
recommended so as not to confuse this Test Plan with an offline
Test Plan for the same circuit breaker.
Содержание TDR9000
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