Voltage measuring and monitoring relay
SIEMENS Smart Grid
Generally these relays are connected to the secondary windings of VT circuits, however an external adaptor unit is available where used with capacitor cones commonly found on distribution networks.
7SG118 voltage relays are typically used in control and interlocking schemes, frequency relays are typically used in load shedding schemes.
Relays have two or three poles and are housed in E4 or E6 cases.
Integrated logic is provided to allow the optimal configuration of relay functionality with the relays analogue inputs and binary input/output circuits.
Protection and instrumentation functionality is accessible via the data comms channel - a fibre optic or RS485 port is provided on the rear of the relay.