Bases Fixing Angles For L66A3 Mast

Products Specification

Type , Model: Bases Fixing Angles For L66A3 Mast

Size: 2M

Use for : L66A1, L66A3  ,2m L type mast

Materials: Q345B

Process: Blasting derusting, 

Painting:  Under painting , Middle painting, Surface painting.

Our factory produce and supply almost all famous brand tower crane :Mast section, Anchor Frame, Fixing angle ,Adaptor and so on as good quality and price.

Bases Fixing Angles For L66A3 Mast

Tower Crane Knowledge sharing：

Explanation of safety technology of grounding and zero connection of tower crane

Grounding and zero connection of tower crane

1. using a single protective earthing measures can not ensure safety in three phase four wire system neutral line direct power grid, if using a single ground.

when the tower crane metal structure leakage current after tower crane earthing resistance and neutral grounding resistance to return to power, because the two grounding resistance value basic equal, its partial pressure also basic same.

This tower crane earthing resistance on half of the 220 v voltage, because the current is not large, voltage can exist for a long time.

If the person standing on the wet ground body parts contact the leakage of the tower body, such as the main and tower crane grounding resistance parallel withstand similar voltage, so there may be electric shock risk.

Bases Fixing Angles For L66A3 Mast

2. the use of zero protection measures can play a protective role, but there are still safety risks. In the three - phase four - wire neutral - wire grounding network, the tower crane adopts metal structure to connect working zero wire protection measures.

When the tower crane metal structure leakage, leakage current directly back to the zero line, forming a phase zero short circuit, because the line resistance is small, the current is very large, will soon be the leakage line on the safety device disconnect, so cut off the leakage power supply, play a protective role.

However, since the working zero line has current flow when the power is not balanced, and there is a certain resistance on the zero line, a certain voltage can be generated on the zero line.

When the metal shell of the equipment is connected with zero, a certain voltage can be generated, which also causes a potential safety hazard. To sum up, in the same power network, some equipment is not allowed to connect to zero, and some equipment to ground.

Since the zero line also generates voltage to the ground when the grounding equipment leaks, all the zero line equipment will be charged, causing a wider range of safety hazards.

Bases Fixing Angles For L66A3 Mast

1. The three-phase five-wire system can play an ideal protection role. A three-phase five wire is on the basis of three phase four wire, add a special protective zero line, PE line, often said head end and zero line is connected to the power supply, are connected to the zero line without any work in the middle.

 End of repeat grounding, due to special protection at ordinary times no current flows through the zero line, equipment shell on the protective zero line, won't produce any voltage, so can have more reliable protection.

2. It is necessary to ensure the reliability of the overload short-circuit protection device when adopting the measure of protecting the zero connection.

Bases Fixing Angles For L66A3 Mast