Table of Contents
Advertisement
5.10
IEC Standard Interlocks
The IEC standards require that an interlock be
provided either on the breaker and or in the gear to
prevent the user from removing the breaker improperly.
Eaton has three ways to solve this IEC interlock issue.
5.11
UX Switchgear Door Interlocks
The UX Switchgear has two interlocks included within
the gear as a standard. Breakers that are ordered for
use within the Eaton UX Switchgear will have a special
levering in assembly that includes a door interlock
mounted on the breaker. The door interlock is used to
keep the W-Vaci from being moved from the
Test/Withdrawn position to the Service position while
the switchgear door is open. The interlock also
prevents the UX Switchgear door from being opened
when the W-VACi breaker is in the Service position.
The levering in cradle interlock functions in the
following way:
When the UX Switchgear door closes, it pushes on the
lever (4). This in turn moves the plate (3) and allows
access to the spindle to engage the worm gear. As the
cradle is racked-in, the hook (2) pivots around the pin
(1) and catches on a corresponding pin mounded on
the door, this locks the door closed when the breaker is
in the service position.
Fig. 5-9: Door / Cradle interlock assembly
The UX Switchgear second interlock works with the
Eaton W-VACi breaker secondary disconnect. It is a
rod that hooks over the secondary disconnect. This
prevents the secondary disconnect from coming out of
its position, when it is installed in the switch gear. The
bar (5) is moved down to lock the secondary contact
block (6) in place by the movement of the W-VACi
breaker from the Test/Withdrawn position to the
Service position.
Fig. 5-10: Secondary Disconnect Interlock
48
5.12
The cradle electromagnetic interlock shown in Fig.
5-11A is placed inside the breaker levering in cradle. It
uses signals from the circuit breaker to determine if it
should be electrically engaged or not. Unless the
secondary disconnect is inserted and power is
supplied, the interlock will prevent the circuit breaker
from being racked in or out of its current position.
The mechanism's electromagnetic interlock shown in
Fig. 5-11B prevents the breaker from being closed,
unless the secondary disconnect is inserted and power
1
is supplied. The voltage releases the locking coil,
2
enabling the breaker to be closed. Please refer to
section 5.9
3
4
5
Fig. 5-12B: Mechanism Electromagnetic Interlock
5.13
OEM's can create there own interlocks to work with the
6
Eaton W-VACi breaker. The interlocks created must
make the complete solution to be in conformance to
IEC standards. Please refer all questions in regards to
unique OEM solutions directly with the OEM supplier.
65A7355H01 November 2011 www.eaton.com
Electromagnetic Interlocks
Fig. 5-11A: Cradle Electromagnetic Interlock
Unique OEM Interlocks
Advertisement
Table of Contents
