TN System Neutral Line Protection

Date of publication by manufacturer: 2023-12-14

Context
Some power grid companies and national standards in some countries, such as France and Germany, require that the energy storage devices connected to a TN/TT low-voltage power grid system provide the neutral line protection function. In this case, a third-party neutral line protection device must be added to the commercial and industrial (C&I) energy storage solution.

Electrical Wiring and Communication Networking

Huawei SmartLogger provides four DI ports. The DI protection signal output from the third-party neutral line protection device can be connected to any DI port of the SmartLogger. The SmartLogger shuts down the inverter and PCS based on the DI protection signals sent by the third-party neutral line protection device.

Figure 1-1 Electrical wiring and networking diagram of a TN/TT system with a third-party neutral line protection device

NOTE

When setting this function, ensure that the user-defined DI port is not occupied by another function. Otherwise, the setting will fail. For details about the external cable connection and parameter settings of the third-party neutral line protection device, see the product manual of the protection device. The UFR1001E product from ZEIHL is recommended. 

Procedure
Set parameters for remote shutdown through dry contacts. Disable the remote shutdown OVGR dry contact.