In the past years, stimulated by the industrial policies of new energy vehicles, new energy vehicle market has developed rapidly. As an important infrastructure for new energy vehicles, the charging pile industry of new energy vehicles has benefited deeply.

         For users, the safety and reliability of charging equipment components are particularly important. With the popular sales of electric vehicles, especially the rapid growth of pure electric vehicles, the market for highly reliable and comprehensive protection of leakage protection scheme is also imminent.

In terms of the protection of charging pile, relevant international standards have made provisions earlier:

On 1st, January, 2019, IEC60364-7-722 Wiring Regulations 18th Edition Section 722.531.2.101 states that for protective measures against DC fault current is requested with all electric charge stations. There are requirements elaborating that where the EV supply equipment is equipped with a socket-outlet or vehicle connector complying with IEC62196(all parts), protective measures against DC fault current shall be taken, except where provided by the EV charging station. The appropriate measures, for each connection point, shall be as follows:

1. The use of an RCD type B; or

         2. The use of an RCD type A in conjuction with a residual direct current detecting device (RDC-DD) complying with IEC62955; or

         3. The use of an RCD type F in conjunction with a residual direct current detecting device (RDC-DD) complying with IEC62955.

Zhejiang Eastron Electronic Co.,Ltd. as a manufacturer and supplier of eletricity products and energy measurement solution, provide a wide range of residual current sensors which complied under IEC 62955:2018. The residual current device family following the regulation of Type A+6mA, which are widely used in EV charging piles.

The whole range are integrated with self-monitoring and self-test functions, which give the EV charger with high reliability and reduces the cost of developing electric vehicle charging solutions.

         Self-test diagram:

l2 widing on the ZCT to generate simualted DC residual current;

lBy using VDD to generate typical value = 6.53mADC simulated residual current;

lThis current is the most restricted tripping condition to test whether system is working correctly.