Richards 137NP, Инструкция по эксплуатации, Страница: 12 / 53

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D. Opening Enclosures
Before opening the enclosure, submersible and non-submersible protectors should be
mounted in their final locations or if to be temporarily supported they must be securely
anchored by the lifting eyes to a firm post or part of a building to keep the protector from
tipping forward. To make inspection easier, the protector may be set up on some blocks, but
if this is done, make sure the bottom of the protector cannot move when the breaker unit is
rolled forward.
Most equipment mounted protectors may be rested upright on the floor without removing the
lower barriers or lower terminals. However, when the lower barriers or terminals extend
below the bottom of the channel frame the protector will have to be rested on blocks placed
under the channels. Firmly secure these protectors to a post or a part of the building so that
they will remain upright.
If the relays are to be tested on a temporarily mounted protector, the protector must be in a
vertical position.
After temporarily supporting or permanently mounting the protector, the enclosure may be
opened by unscrewing the cover bolts. If necessary, pry the cover open but do not damage
the gasket with the instrument used to pry the cover loose.
E. Removing the Breaker Unit (see Figure 1 and 2)
Submersible and Non-Submersible Protectors
Remove the fuses and disconnects as outlined below for the different arrangements of
protectors. Then lift the folding rails up and forward and lower them to the horizontal
position so that they form a continuous surface with the rail in the enclosure. The unit may
be rolled forward, after removing the four mounting screws.
WARNING: The manual operating handle must always be in the OPEN position
before the breaker unit can be rolled forward or back into position for remounting in
the enclosure.
1. Transformer Mounted Protectors
Top connected protectors. Warning, the following sequence must be followed. First
remove the fuses without disturbing the fuse connecting blocks, then remove the fuse
connecting blocks and the screws securing the protector unit to the low voltage
transformer bushing. Reverse above procedure for replacing the protector unit.
2. Separately Mounted Protectors
Remove the fuses at the top of the protector and the disconnecting links at the bottom of
the protector.