Electrical safety: the necessity of locking device

In order to ensure electrical safety, power distribution devices must be equipped with locking devices to prevent electrical misoperation. This paper will introduce the necessity and suggestions of using locking device in detail to help readers better understand the electrical safety specification.

The mechanical locking mode is more reliable.

According to Article 3. 10.6 of National Grid Standard "Code for Design of 35kV ~10kV Substations" (GB 50059-20 1 1), it is suggested to adopt mechanical locking, especially for complete switchgear. This method is more reliable and can effectively prevent electrical misoperation.

Prevent from entering the charging interval by mistake

For the intermittent power distribution device installed in the house, it is necessary to install facilities to prevent it from entering the live car by mistake. This can effectively prevent people from straying into the charged space and ensure electrical safety.

Power isolation reduces risk.

The power supply of interlocking circuit should be completely isolated from the power supply of relay protection and control signal circuit to reduce the potential danger of electrical accidents. This can effectively avoid power interference and electrical accidents.