5 Mounting
24
7232312/00 EN
DANGER
Electric shock!
Danger of death due to electrical voltage when assembling/
disassembling the device.
► Switch off transformer on high-voltage side and low-voltage side.
► Lock transformer to prevent unintentional restart.
► Make sure that everything is de-energized.
► Visibly connect all transformer terminals to ground (grounding leads,
grounding disconnectors) and short circuit them.
► Cover or cordon off adjacent energized parts.
This chapter describes how to install the flow indicator on a pipe and electri-
cally connect the micro-switches.
5.1 Checking the pipe flanges
The pipe flanges must be flush and clean to allow the Buchholz relay to be
positioned with the least possible stress. Even slight unevenness on a pipe
flange can cause the Buchholz relay flange to be curved too much, leading
to cracks in the flange caused by the resulting transverse stress.
Therefore, check the following:
▪ Pipe flanges
– Flush and even
– Evenness deviation ≤ 0.2 mm
▪ Pipe flange sealing surfaces
– Clean and undamaged
– Without any damage along the radial surface such as scratches or
points of impact
– The surface quality of the sealing surface must be suitable for the gas-
ket being used
▪ Installation material (screws, nuts, washers)
– Clean and undamaged, particularly the threads and contact surfaces
▪ Gasket
– Clean, undamaged, dry
Содержание MESSKO MSAFE
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