Huawei certifies smart string-level PV disconnect that identifies dc faults


Huawei launched the world’s first PV inverter that supports smart string disconnection, which can accurately detect the current signals of each string. This Smart String-level Disconnection (SSLD) tech for PV plant safety gained certificate of low-voltage circuit breaker (IEC60947-2) from DEKRA and Intertek respectively. Huawei is the first vendor to get the certificates by using smart string shutdown tech.

“It is imperative to enhance the safety protection level of new energy plant by digital technology,” stated Steve Zheng, president of Utility Smart PV Business of Huawei.

The SSLD tech can accurately identify faults from DC side of PV system such as reverse polarity connection, backflow current, short circuit, and implement automatic string-level shutdown on millisecond basis, which can effectively improve the active safety capability of the PV plant.

When a fault is detected, the software transmit the switch-off signal to the dc switch, immediately trigger disconnection and alarm, which can reduce the fire risk of PV plant significantly.

Dr. Kilian Avilés, SVP of DEKRA Asia Pacific and Managing Director of Mainland China and Hong Kong, stated: “I am very excited to see Huawei’s cutting-edge solution that integrates digital and smart technology with electronics to guard safety and maximize energy efficiency. We look forward to working with Huawei to create a green and sustainable future.”

“Intertek and Huawei Digital Power have maintained close cooperation in the field of product compliance for a long time and have achieved fruitful results,” stated Li Qiong, General Manager of Intertek Electronic & Electrical in South China.

Intertek advocates building and highlighting the quality advantages in new products and new technologies with professional and innovative comprehensive services.

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