1, power module configuration
Module capacity to meet the requirements, three-phase configuration is balanced.
2, lightning surge protector
there is no damage or not access (including surge protector lightning ground, three-phase power line access, access location is normal, wire diameter is in line with the requirements) Surge protector lead wire should be used not less than 16mm2 insulated copper wire, voltage resistance is not less than AC500V.
When using modular SPD, the lead wire The length of the surge protector grounding line should be as short as possible, the use of not less than 35mm2 insulated multi-stranded copper wire near to the grounding collection line, the wire should be used yellow-green copper wire, SPD grounding line length should be less than 1.5m.
3, power cabinet
1) Power cabinet grounding
2) cable introduced into the grounding
Armored Cable introduction of iron grounding: cable ends of the steel strip should be close to the ground;
Sheathed steel pipe introduction of steel pipe grounding: steel pipe ends should be welded with the base station grounding system close to the grounding system;
3) Power Cabinet Fixing and Door Lock
Power Cabinet and the ground insulation is fixed;
Door lock is intact and closed.
4, transmission rack grounding
1) lightning ground;
2) fiber optic cable introduction;
3) rack equipment, protective grounding.
5, the main equipment lightning protection
1) lightning protection unit
2) grounding wire
6, around the base station there is no lightning path
base station above or close to the base station due to the absence of overhead high-voltage lines, overhead cables are not suitable for high-power wireless transmitters, high-power radar stations, high-voltage power stations and welding equipment, X-ray equipment or generate strong pulse interference Heat and machine, high-frequency furnace enterprises or medical units to set up the station.
1) Transformer - high-voltage, low-voltage lightning protector
Transformer terminals should be fastened without loosening, to ensure good electrical contact, no oxidation, heating phenomenon, wiring vase without rupture. Transformer shell without traces of oil leakage. Transformer neutral point, shell grounding lead wire should ensure good fastening, no fracture, loose phenomenon.
2) monitoring equipment
7, base station grounding
1) ground network requirements
base station ground network due to no corrosion, rust, peeling, exposed soil, digging phenomenon, communication station buildings (or towers) should be installed to protect against direct lightning can inhibit the effect of secondary lightning lightning protection devices.
Mobile communication base station should be in accordance with the principle of equalization, equipotential, work grounding, protective grounding and lightning grounding to form a joint grounding network. Various types of grounding wire should be introduced from the grounding collection line or grounding network respectively. Various types of grounding wire should be short, straight, to ensure the shortest path of discharge.
2) grounding resistance
Test the base station resistance to meet the requirements of the mobile communication base station is located in an area where the soil resistivity is lower than 700 ohms * meters, the frequency resistance of the base station ground network is appropriate to control the frequency resistance of 10 ohms or less, when the base station's soil resistivity is greater than 700 ohms * meters, may not be restricted to the frequency resistance of the base station ground network.