Grounding Of Bts Equipment; Internal Grounding Of Cabinet; External Grounding Of Cabinet; Grounding Of Ac Lightning Arrester - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
For 1900MHz band, when the TMA is configured, the DDU with BIAS T should be
configured, the BTS provides the TMA with power supply through the DDU, so
lightning arrester is needed at the feeder port of the BTS; If the TMA is not
configured, the lightning arresters is also not needed.
II. Lighting protection for satellite synchronization antenna & feeder
The GPS/GLONASS satellite synchronization antenna & feeder is under the protection
of lightning rods. Other lightning protection measures include:
Grounding of feeder at three points: In actual implementation, the number of
grounding points depends on the length of the feeder.
External lightning protector: In normal condition, a lightning arrester is connected
to the BTS side to avoid the possible damage to the BTS equipment caused by the
lightning current induced by feeder cores.

6.3 Grounding of BTS Equipment

6.3.1 Internal Grounding of Cabinet

Grounding terminals are installed at the cable outlet port, the bottom and the door of the
cabinet.
Busbars are installed in the main cabinet, with common grounding cables. Various
equipment connects to the grounding system of the cabinet using the grounding
cables.
Various metal components of the BTS3612A are of high electric conductivity and no
insulation paint is applied to the connection points of metal components.
Cabinet frames, power distribution unit, PSU and air-conditioner regulator are all
equipped with metal shells, which are reliably connected to the metal mechanical parts
in the cabinet.

6.3.2 External Grounding of Cabinet

A protection grounding (PGND) cable is connected from the PGND of BTS3612A to the
nearest grounding copper bar of the office.

6.3.3 Grounding of AC Lightning Arrester

Grounding device is installed in the vicinity of AC lighting arrester and connects the
grounding cables of AC lightning arrester to the GND of the grounding device. The
dual-color (yellow and green) plastic insulation copper-core conducting cables are
adopted with the cross-sectional area less than 6mm
Chapter 6 Lightning Protection and Grounding
2
and cable length less than 10cm.
6-4
System Principle