Pin discharge test
Pin discharge is also called residual voltage. In electrical equipment, pin discharge is an important safety measure. Its main purpose is to prevent potential risks caused by static electricity accumulation. Here's a detailed explanation:

1. Prevent static electricity accumulation:

When an electrical device is powered on for a long time, its internal energy storage element will be fully charged. After pulling out the pin, if there is no effective discharge circuit or the power in the energy storage element is too large and does not match the discharge speed of the discharge circuit, it will give the person who touches the pin a feeling of electric shock. Therefore, discharge can effectively prevent the accumulation of static electricity and ensure personal safety.

2. Make sure the device is functioning properly:

Pin discharge also ensures the proper operation of electrical equipment. For example, the insulation of high-voltage equipment may produce partial discharge under the action of long-term operating voltage. If partial discharge continues to develop, it will cause aging and damage to the insulation, affecting the safe operation of electrical equipment. Therefore, in order to ensure the safe operation of high-voltage equipment, partial discharge detection must be performed on electrical equipment and ensure that it is within the allowable range.

3. Comply with safety standards:

Different countries and regions have their own electrical safety standards, which usually require electrical equipment to discharge effectively after unplugging the pins. For example, China's GB4706.1-2005 standard and IEC60335-1:2010 standard both stipulate the time and voltage limits for plug discharge. Therefore, pin discharge is a requirement of international safety standards and helps protect consumer safety.

To sum up, pin discharge is an important safety measure. It can effectively prevent the accumulation of static electricity, ensure the normal operation of electrical equipment, and comply with the requirements of international safety standards.