K60 Mast Section For Tower Crane Masts

Products Specification

Type , Model: L44A1 Mast Section For Tower Crane Masts

Size: 2mx2mx5m 

Materials: Q345B

Within: Pins, bolts, Ladder, Platform

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.

K60 Mast Section For Tower Crane Masts

Tower Crane Knowledge sharing：

Analysis of reasons and treatment of frequent trip of electric leakage protectors at construction site
The electrical environment at the construction site is generally relatively poor, and the equipment and lines used are relatively dangerous, and the fluidity, repeatability, and temporality are strong. The quality of the electric personnel and even the managerial personnel participating in the construction is uneven.

The purpose of the mandatory use of TN-S three-phase five-wire power supply method at the construction site is to ensure the safety of electricity use on the construction site and to strengthen the management of electricity use.

The leakage protection device at all levels is the most critical protection equipment in the TN-S power supply system. Due to the particularity of the construction site, the frequent trip of the leakage protection device at all levels is always caused in the actual construction.

K60 Mast Section For Tower Crane Masts

This not only seriously affects the normal construction of the construction site, but also makes the safety of the construction site electricity can not be effectively guaranteed. Through the management and experience of construction power supply at construction site, the following analysis is made on the reasons of frequent trip of leakage protection device at construction site.
Reasons for Frequent Blocking of Leakage Protector at Construction Site
1 Unreasonable layout of leakage protector
According to the JCJ46-88 Technical Specification for Temporary Electric Power Safety on the Construction Site, leakage protectors should be installed in the temporary power distribution box and switch box to form a three-level distribution secondary leakage protection model.

Due to the special characteristics of the construction site, such as poor electrical quality, faulty wiring, non-electrical wiring, damage to the line, damage to the leakage protection device in the switch box, and some electrical appliances not passing through the switch box and poor management at the construction site.

K60 Mast Section For Tower Crane Masts

As well as the inevitable errors and rejections of the leakage protection device itself, coupled with the fact that the leakage protection device was not arranged according to the actual conditions of the construction site during the actual construction, the total leakage protection device frequently jumped, and the power outage range was large.

At the peak of construction, the frequent trip of the total leakage protection device not only seriously affected the normal construction of the site, but also made the electrician handling the failure exhausted and even helpless.

In addition to strengthening the management of the construction site, it is necessary to reasonably arrange the leakage protection device according to the actual situation of the construction site from the perspective of technology.

In some large construction sites such as residential building sites and industrial projects, it is necessary to divide the entire site into several small leakage protection areas according to professional or different construction teams, and form secondary leakage protection within each protection area.

K60 Mast Section For Tower Crane Masts

Third level leakage protection is formed when necessary. This can improve the protection sensitivity of the second or third level leakage protection in each protection area, improve the action rate of the leakage protection device when the protection area fails to leak electricity, and reduce the total leakage protection device trip.

K60 Mast Section For Tower Crane Masts

Reasonable arrangement can also promote each construction team to manage independently and facilitate the management of the project department. In this way, the leakage protection device on the total power supply on the construction site can mainly serve as the total protection against potential electrical fire hazards and electrical short circuits on the construction site, and also serve as a backup protection for each small leakage protection range.

Its rated leakage action current can be selected from 200 to 500mA according to the size of the construction site. The rated leakage action time can be selected from 0.2-0 .3 S, which can greatly reduce the surge voltage, current, and electromagnetic interference on the total leakage protection.

K60 Mast Section For Tower Crane Masts

The impact of the device, Improve the selectivity and reliability of the action of the total leakage protector. If the secondary leakage protection in each leakage protection area can be effectively protected by strengthening the management of the leakage protection device at the site, the frequent trip probability of the total leakage protection device at the site can be greatly reduced.