What Is a Barrier Metal?

The main purpose of the electrical protection barrier is to prevent people or animals from approaching the charged object from any direction. The use of a casing or a barrier can completely isolate the dangerous live parts from the outside, thereby avoiding direct contact and dangerous live parts from any direction or often approaching the direction, which is a complete protection.

Electrical protection barriers are generally made of dry wood or other insulating materials. There are three types of barriers, insulating baffles and insulating covers. It is used to protect the expansion staff from accidentally touching or excessively approaching the live parts, and also used as an isolation measure when the maintenance part is not safe enough from the live body. The purpose of installing a fence is to isolate the working place from the live area or to isolate the dangerous area from space, and prevent workers from accidentally touching live equipment at wrong intervals. For high-voltage installations, this protection must be properly implemented regardless of its own insulation and protection. ^[1]

There are two types of electrical protection fences: fixed fences and temporary fences. Fixed fences are usually welded with metal parts; temporary fences can be made of dry wood or can be replaced by rope. Fixed fences are often installed in front of high and low voltage electrical intervals, around control panels, or around high-voltage equipment installed outdoors. Temporary shelters are installed near or near the working site of the power outage maintenance equipment or in the vicinity of the electricity gap or in aisles and entrances that are not allowed to pass. Commonly used for drying bamboo and wood materials, there are railing type, fence type, flat type and mesh type.

The height of the fence is not less than 1.7m, and the edge of the lower foot should not exceed 10cm from the ground. The distance between the fence and the charged body shall not be less than 350mm from 6 to 10kV; not less than 600mm from 20 to 35kV. The style of the fence is shown in the figure. The mesh of the fence should be between 20x20 40X40 (mm), the spacing between the bars should not exceed 0.2m, and the height of the wall of the outdoor transformer unit should generally not be lower than 2.5m. ^[2]

The electrical protection barrier is used to separate the live and non-charged electrical barriers. It is a barrier provided to prevent staff from accidentally touching or approaching the charged body during the maintenance of transformer equipment and other electrical equipment. When it is found that the safety distance for maintenance is insufficient, a fence safety isolation device shall be provided.

The electrical equipment of substations should be equipped with safety barriers for those who may not be able to meet the safety distance requirements during normal inspections. For example, if the transformer is installed indoors or outdoors, if the high-voltage bushing is close to the ground, a safety fence should be installed. ^[3]