Minimum Clearances - Siemens GEAFOL Operating Instructions Manual

GEAFOL- / CARECO-Cast-resin Transformer/ Operating Instructions
The arrangement of the switch tubes and washers is
shown in Fig. 5-9. All six screws of the switch tubes must
then be tightened with a torque wrench (torque for M10
with 45 Nm, for M12 with 75 Nm).
If there are covers on the switch tubes, push the cover
onto the connection cone until the screw of the contact
connection can be felt through the cover (see Fig. 5.10).
Position the clamp and tighten the hexagon of the clamp
until the front edge of the white marking on the band is
flush with the body of the clamp (See Figure 5.11)
Setting up
5.9
DANGER!
Cast-resin transformers are not safe to touch. The power
must be shut off before work is performed on the
transformers. Applicable regulations must be observed.
GEAFOL-/CARECO-transformers should be installed only in
a sheltered area or cell that is dry and protected from
sunlight, where the degree of protection assured is at least
IP 20. If appropriately coated with special paint and if an
outdoor housing is used, they are also suitable for
installation outdoors (minimum IP 23). GEAFOL cast-resin
transformers need an adequate supply of fresh air to
dissipate the heat loss. Approximately 200 m3 of fresh air
per hour and for each kW of heat loss is the recommended
value; more information can be found in the GEAFOL
Planning Guidelines.

Minimum clearances

5.10
Make sure that the clearances from the surface of the cast-
resin coils to the walls, busbars, grounded parts, and other
elements satisfy the applicable installation and safety regu-
lations
(see Table 5-1 and Fig. 5-10).
For installation above 1000 m above sea level, the mini-
mum distances according to Table 5-1 shall be increased by
one percent for every 100 metres of altitude by which the
installation altitude exceeds 1000 m.
Bild 5-11: Position der Farbmarkierung
auf Schelle nach dem Anziehen
Maxi- Rated lightning
mum impulse with-
voltage stand
for voltage ULI1)
equip- (See type plate)
ment
Um1)
[kV] [kV]
12 75
24 95
24 125
36 145
36 170
52 250
72,5 325
1) see IEC 60071
* If there are high-voltage tappings on this side,
the value in column a applies to the clearance b;
otherwise, the value in column c applies.
** Distance from blank, energized parts to walls or
OS cables. For transformers with complete insu-
lation at connection bars and switch tubes (bot-
tom and top), the values of dimension c are to
be used for the minimum distances of dimension
a.
*** The distance d between the delta connections is
defined constructively by the manufacturer
Table 5-1
Minimum clearances
(see Fig 5.10)
a** b** c**
[mm] [mm] [mm]
120 * 55
160 * 85
220 * 105
270 * 125
320 * 170
480 * 300
630 * 450
© 2021 Siemens Energy
d***
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