Using the Web HMI - Arc protection - Auto synchronization - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Petersen Coil control - Grid automation - Busbar differential protection (high impedance) - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Transformer protection - 3 winding - Interconnection protection - Generator protection - Power management/Load shedding - Engineering Manual - REX640 Protection and control - PCL6 - IEC - ANSI

Connection to WHMI can be established using any Ethernet port. WHMI is disabled by default and can be enabled with a setting parameter. As only secure communication is supported for the WHMI, it must be accessed from a Web browser using the HTTPS protocol. Three simultaneous WHMI sessions are supported.

To enable the WHMI, select Configuration > HMI > Web HMI mode and set the parameter to "On".
Reboot the relay for the change to take effect.
Log in with the proper user rights to use the WHMI.

Note: To establish a remote WHMI connection to the protection relay, contact the network administrator to check the company rules for IP and remote connections.

Note: HTTPS is enabled for all ports by default. To disable the HTTPS for station ports, select Communication > Protocols > Network1 > HTTPS or Communication > Protocols > Network2 > HTTPS and set the parameter to "Off".

Note: The WHMI write access can be limited with the parameter HTTPS write access in Configuration > Authorization > Network1 or Configuration > Authorization > Network2.

Note: Disable the Web browser proxy settings or make an exception to the proxy rules to allow the protection relay's WHMI connection, for example, by including the relay's IP address in Internet Options > Connections > LAN Settings > Advanced > Exceptions.