L&T Electrical & Automation OMEGA, Руководство пользователя

Страница: 132 / 135

W a t t - l o s s D a t a o f O M E G A A C B s
Watt loss plays an important role in the electrical performance of Air Circuit Breaker. Factors like overall dimension, rated current
carrying capacity of Bus-bar and watt loss of apparatus attached to the Air Circuit Breaker also plays an important role in
calculation of watt loss data.
Total watt loss value is measured at rated current (In) of 3 Pole Air Circuit Breaker at 50/60 Hz. (W=3xInˆ2xR), where
R is the resistance measured across the upper & lower terminated of ACB.
131
T e r m i n a t i o n - D r a w - o u t B r e a k e r s
All Dimensions in mm
A l t i t u d e d e r a t i n g o f O M E G A A C B s
As altitude rise from sea level, the density of that air reduces dramatically. Reduced air density at altitudes greater
than 2000 meters affects the ability of a circuit breaker to transfer heat and interrupt faults compared with sea
level.The ability of fault interruption reduces with the increase of altitute because di-electric strength of air also
reduces with density.
A l t i t u d e d e r a t i n g
Altitude
Rated service voltage (at 50/60 Hz)
O
Rated Uninterrupted Current at 40 C
Impulse withstand voltage
Rated insulation voltage
H
U
e
I
n
U
imp
U
i
(m)
(V)
(A)
(kV)
(V)
<2000
U
e
I
n
12
1000
3000
0.9U
e
0.98I
n
11
900
4000
0.8U
e
0.96I
n
10
780
5000
0.7U
e
0.94I
n
8
700
F r a m e S i z e & C u r r e n t
R a t i n g
UW1-08
UW1-10
UW1-12
UW1-16
UW1-20
F o r d r a w - o u t A C B ( W a t t )
N
100
160
210
325
440
S
50
65
100
160
390
H
35
50
65
100
220
V
560 UW2-25
UW2-32
UW3-40
UW3-50
UW3-63
560 465
600
500
750
1000
500
750
1000
600 600
UW2-40 770 770