Description
SecoVac 3.3kV-27kV Embedded Pole Vacuum Circuit Breaker
Application Condition
High performance
from the normal application conditions,
circuit breaker and associated devices
and auxiliary equipment shall be designed
and manufactured to comply with any
special application conditions. For special
application conditions please consult with
GE in advance, normally the following
special service conditions maybe
encountered:
ő
The installation location is more than
1,000m above sea level
ő
The ambient temperature is between
please contact GE sales for further
detail
ő
The circuit breaker current and
dielectric ratings must be lowered for
high altitude and elevated temperature
applications
IEC 60071-2, 4.2.2 the altitude correction factor can be calculated using the following equation,
which modied to reect that no correction is required up to 1000m.
Where
H
Is the altitude, in metres
m
Is taken as a xed value in each case for simplication as follows
m = 1
for power frequency, lightning impulse and phase-to-phase switching impulse voltages
m = 0.9
for longitudinal switching impulse voltages
ő
The ambient air temperature does not
exceed 40°C and its average value,
measured over a period of 24 hours,
(storage and transportation is allowed
at -30°C)
ő
For applications above 1
,
000m please
refer to chapter 4.2.2 of IEC 60071-2
(see following table for reference)
ő
The conditions of humidity are as
follows:
- The average value of the relative
humidity, measured over a period of
- The average value of water vapor
pressure, measured over a period of
24 hours, does not exceed 2.2kPa
- The average value of the relative
humidity, measured over a period of
- The average value of water vapor
pressure, measured over a period of
one month, does not exceed 1.8kPa
ő
Seismic intensity to UBC zone 4 or GB
intensity 9
ő
No adverse operating environment
such as dust, humidity, vermin, polluted
ambient and high altitude operating site
Special application condition
Altitude Derating MV
m
1,000
K (m=1)
1
V
1
K (m=0.9)
1
In
1
1.062 0.94 1.06 0.9
2,000
1.132 0.88 0.12 0.89
1.2 0.83 1.18 0.8
3,000
1.28 0.78 1.246 0.80
1.36 0.74 1.32 0.76
4,000
1.44 0.69 1.39 0.72
K
m(H-1000)/
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