GTL-823 Distance Protection Relay 1.4U standard aluminum chassis 2.Ethernet,RS232/485 communication interface 3.UFLS protect GTL-823 Distance Protection RelayIt mainly used in 110kV/66kV voltage level of the line and feed outlet, it set the protection, operation box, voltage switching, measurement, communications, record wave functions in one, in low pressure line of protection, monitoring and ...