GE G30 | Generator Protection System

GE G30 |  Generator Protection System

Protection for small to medium generators, combined generators and transformers Built on the industry-leading UR platform, the G30 provides advanced protection for small to medium-sized steam, hydraulic and combustion-turbine generators. The G30 is also well suited for applications where both the generator and transformer are in the same zone of protection, providing the required protection in one device. The G30 provides advanced communication with an integrated managed Ethernet switch, while supporting standard communication protocols including IEC 61850.

GE G30 |  Generator Protection System

  • Cost effective protection of small to medium sized generators, includes unit transformer protection. The G30 Generator Protection System, part of the UR family of protection relays, provides protection for small to medium sized generators and for applications needing combined generator and transformer protection.


  • Small to medium-sized generators typically driven by steam, gas or hydraulic turbines
  • Pumped storage generators
  • Combined generator and transformer in the zone of protection•Distributed Generator (DG) interconnect protection as per IEEE 154


  • Complete protection for small to medium-sized generators
  • Advanced automation capabilities for providing customized protection and control solutions
  • Combined generator and transformer protection
  • Three independent fiber or copper Ethernet ports for simultaneous/ dedicated network connections with advanced 1 microsecond time synchronization via LAN with IEEE® 1588 support
  • High-speed peer-to-peer communications reduces relay-to-relay wiring and associated installation costs
  • Embedded IEC®61850 protocol
  • Increase network availability by reducing failover time to zero through IEC 62439-3 "PRP" support
  • CyberSentry™ provides high-end cyber security aligned to industry standards and services (NERC® CIP, AAA, Radius, RBAC, Syslog)
  • Robust network security enabling Critical Infrastructure Protection through user command logging, and dual permission access control
  • High-end fault and disturbance recording eliminates the need for redundant recording devices
  • Complete IEC 61850 Process Bus solution provides resource optimization and minimizes total P&C life cycle costs


Protection and Control

  • Overall unit differential including transformer
  • Restricted ground fault, thermal overload protection, directional, time, instantaneous, phase, neutral, negative sequence and ground overcurrent protection
  • Split-phase protection
  • Loss of excitation, overexcitation
  • Third harmonic neutral undervoltage
  • Generator unbalance
  • Reverse and low forward power
  • Accidental energization
  • Synchronism check
  • Phase sequence reversal for pumped storage
  • CT failure for each CT bank, VT fuse failure


  • Networking interfaces: up to three Ethernet ports 100Mb fiber or copper, RS485, RS232, RS422, G.703, C37.94
  • Multiple protocols: IEC 61850, DNP 3.0 and Modbus® serial/TCP, IEEE 1588, IEC 60870-5-104 and 103, PRP, SNTP, HTTP, TFTP, EGD
  • Direct I/O: secure, high-speed exchange of data between URs for transformer tripping applications
  • Embedded managed Ethernet switch with four 100 Mbit fiber optic ports and 2 copper portsIEC 61850 Process Bus Interface

IEC 61850 Process Bus Interface

  • Robust communications with up to 8 HardFiber Bricks
  • Redundant architecture for dependability and securityMonitoring and Metering

Monitoring and Metering

  • Metering: current, voltage, power, energy, frequency
  • Advanced recording capabilities deliver a 1024 event recorder, configurable and extended waveform capture and data logger
  • Setting for security audit trails for tracking changes to G30 configurationsEnerVistaTM Software•Graphical Logic Designer and Logic Monitor to simplify designing and testing procedures via EnerVista UR Engineer

EnerVistaTM Software

  • Service and update notification toolset ensures device documents and software are up-to-date via EnerVista Launchpad
  • EnerVista Integrator providing easy integration of data in the G30 into new or existing monitoring and control systems

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