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Installation and commissioning guide
2750 515-1 EN, REV. 14, 2020-06-26
2.2 Technical specification
2.2.1 General specifications
Refer to the table for the standard technical specifications of the bushing. For conditions exceeding the
specifications, please contact ABB.
Application:
Transformers/reactors
Classification:
Transformer bushing
•
Oil impregnated paper, capacitance graded, oil immersed.
•
For outdoor and indoor use.
Ambient temperature limits:
-40 °C to +40 °C, limit temperatures.
Maximum altitude of site:
1000 m (Bushings for other altitudes can be provided on
request.)
Level of rain and humidity:
1-2 mm rain/minute horizontally and vertically, according to
IEC 60060-1 and IEEE Std 4.
Maximum pollution level:
According to the specific creepage distance, and IEC 60815.
Immersion medium:
Transformer oil.
•
Maximum daily mean oil temperature: +90 °C.
•
Maximum temporary oil temperature, at short time
overload: +115 °C.
Oil-level in transformer:
Not lower than 30 mm from the bushing flange.
Maximum pressure of medium:
p
g
100 kPa (p
g
= relative to ambient pressure).
Angle of installation:
0° to 60° from vertical.
(GOE 1300, 1425 and 2550-1675 0° to 30°.)
Test tap:
Test tap with 8 mm male contact pin.
According to IEEE type A.
Conductor:
Center-tube conductor, or draw lead.
Markings:
Conforming to IEC/IEEE.
2.2.2 Mechanical loading
Maximum permitted static load on the outer terminal
The load must be applied below the midpoint of the outer terminal. The total cantilever load must be
perpendicular to the bushing axis. The bushing installation angle can be 0° – 60° from vertical.
Only bushings that are specified for horizontal installation can be installed at 90° from vertical.
In the axial direction, the bushing can withstand a static load of 20 kN.
NOTE!
The loads described in this section are static loads, for dynamic loads such as earthquakes and
extreme wheather conditions, please contact your ABB sales representative.
