Basic requirements for ensuring mine power supply safety

First, insulation and screen protection

In order to avoid accidents such as short-circuit or electric shock between the charged bodies or the contact of the charged body with the human body and other electrical conductors, the charged body must be insulated. The insulation performance of electrical equipment is mainly measured by indicators such as insulation resistance and compressive strength.

In order to prevent the human body from approaching or touching the charged body, it is the screen protector to isolate the charged body with a cover, a shield, a cover, and the like. Screen protection device made of a metal material to be charged with good insulating body and connected to ground or zero.

Second, the safety distance

In order to prevent accidental people and vehicles from approaching the charged body and preventing electrical short-circuit and discharge, it is required to maintain a certain safe distance between the charged body and other devices and facilities, which is referred to as the distance.

In the open pit mine, the height of the high-voltage transmission line and the maximum height of various mechanical equipment shall not be less than 2 meters, and the low-voltage transmission line shall not be less than 1 meter.

Third, the current carrying capacity

The current carrying capacity is the amount of current passing through the conductive part of the guide wire or equipment. If the amount of current passing exceeds the safe current carrying capacity, it will cause severe heat generation, which may damage the insulation, damage the equipment (wire), and may even cause a fire. Therefore, when selecting and installing lines and equipment, the maximum current during normal operation must not exceed the safe current carrying capacity.

Fourth, the safety signs

The electrical safety signs are for warning purposes and are distinguished by various properties or uses. Warnings are generally used for warning signs, such as "someone works, no electricity is allowed". Representing different properties or uses is generally indicated by a different color.