Synchronous Generator Relay GMS7001
Protection of synchronous generators driven by any type of prime mover: steam turbines, water turbines, gas turbines, diesel engines, gas engines. 
There are three models: 
GMS7001: Used when 3 phase voltages are available (3VT/ distributed neutral) and when the zero sequence voltage, calculated internally, is used as a characteristic value in the operation of the relay. 
GMSH7001: Used when 2 phase to phase voltages are available and when zero sequence current is used as a characteristic value in the operation of the relay. 
GMSV7001: Used when 2 phase to phase voltages are available and when zero sequence voltage, from a star point or open-delta VT, is used as a characteristic value in the operation of the relay. 

ANSI functions: 
GMS7001 & GMSV7001: 
21 / 24 / 27 / 32RP / 32P / 37P / 40 / 46 / 49 / 51 / 59 / 59G / 81 
GMSH7001: 
21 / 24 / 27 / 32RP / 32P / 37P / 40 / 46 / 49 / 51 / 59 / 64 / 81

See the PROCOM series homepage for the full brochure of GMS7000 products