HVDC TRANSFORMER BUSHINGS
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
IS 2664 GB
Page
20
of
70
The valve blocks can be of two types, the type named Filtering valve block, that includes three different valves
(see
Figure 10 a
) and the type named By-pass valve block, that includes the by-pass valve only (see
Figure 10
b
).
a) Filtering valves block
b) By-pass valve block
Figure 10 – PHI bushing valves
Vacuum pump and oil filling and filtering equipment can be connected to the filtering valves through two ¾” BSP
connections placed on the side of each filter valve block. These connections are protected by a removable cap
(see
Figure 11
).
By-pass valves are placed in both type of blocks and are necessary to ensure the proper oil circulation during
the normal bushing operation. The by-pass valve blocks are not equipped with the ¾” BSP connections.
Next
Table 11
describes the correct valve positions as a function of the specific operative conditions on the
bushing.
Operative condition
Filtering valves
By-pass valves
Oil filling and filtering
OPEN
CLOSED
Bushing normal operation
CLOSED
OPEN
Table 11 – Filtering and by-pass valve position
C
lo
s
e
d
O
p
e
n
C
lo
s
e
d
O
p
e
n
C
lo
s
e
d
O
p
e
n
To the pump
To the pump
Filter valve
Filter valve
B
y-pass valve
C
lo
s
e
d
O
p
e
n
By-pass
valve
Содержание PHI 530.1425.2500
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