Nokia Solutions and Networks T5DK1 사용자 설명서
BTS Power Cabling
68P64115A19
–
4
Mar 2003
1X SC 4812T-MC BTS Hardware Installation - Software Release R2.16.1.x
CONTROLLED INTRODUCTION
2-45
Current Sharing
For installations with one power feed (2 carrier system cabling) use
Option A (see Figure 2-21).
Option A (see Figure 2-21).
For installations with two feeds (e.g., 3 carrier or 4 carrier systems using
cabling Option B, (see Figure 2-22), the total current will be shared
between the two feeds. If the current becomes greatly unbalanced
between the two feeds, the circuit breaker carrying the greater current
may be tripped. In this case, all current will flow in the remaining feed,
causing the breaker to be tripped, and the BTS to go out-of-service. In
order to minimize the current imbalance between the feeds, it is
necessary to:
cabling Option B, (see Figure 2-22), the total current will be shared
between the two feeds. If the current becomes greatly unbalanced
between the two feeds, the circuit breaker carrying the greater current
may be tripped. In this case, all current will flow in the remaining feed,
causing the breaker to be tripped, and the BTS to go out-of-service. In
order to minimize the current imbalance between the feeds, it is
necessary to:
S
ensure the cable lengths and sizes of the cables are the same,
S
the breakers on the two feeds are the same (same manufacturer, same
part number, etc.), and
part number, etc.), and
S
contacts and connectors are identical.
For short cable runs with two feeds, it is recommended that 2/0 cable be
used rather than 3/0 or 4/0.
used rather than 3/0 or 4/0.
Option A. Power Distribution Cabling for +27 V BTS Configuration with One
Power Feed
Power Feed
Figure 2-21: BTS Power Cabling for the +27 V BTS Configuration using One Power Feed
+27 VOLTS
GROUND (0 VOLTS)
M/1
M/1
SC4812T–MC
ti-CDMA-WP-00190-v01-ildoc-ftw–REF
2