
Circuit Switchers and High-Current Generator Breakers with Isolating Contacts
A-20
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
Circuit Switchers and High-Current Generator Breakers with Isolating Contacts
A circuit switcher is an outdoor switching device which incorporates an
interrupter and knife blade. This combines the functions of a circuit
breaker and a disconnect switch. Although more limited in application
than a circuit breaker due to, for example, lower interrupting ratings, they
are an economical solution when higher ratings are not required.
Circuit switchers employ SF
6
, vacuum, or other types of interrupters to
break a circuit, and either the interrupter or the knife blade to make the
contact. Models with more than one gap can utilize voltage-grading
resistors. The interrupter/knife blade combination is mounted on a
disconnect switch structure, while the center insulators of each phase are
linked mechanically with an interphase pipe that simultaneously rotates
them in the same way as a disconnect switch. The sequence of operation
varies with the type of circuit switcher.
Figure A.20 presents an example where the interrupter does the circuit
breaking and the knife blade does the circuit making.
Figure A.20 Circuit Switcher Operations
Source
Closed
Load
Open
Open
Open
Closed
1
2
3
4
5
Содержание TDR9000
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