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Multilin G30
Generator Protection Systems

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.

Key Benefits

  • Complete protection for small to medium-sized generators and transformers
  • Advanced IEC61850 Ed. 2 certified implementation, complete settings via SCL files and IEC 61850-9-2 process bus solution enable resource and platform managing optimization and reduce cost of ownership
  • Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation, which enables wide area protection and control applications
  • Combined generator and transformer protection
  • Advanced automation capabilities for providing customized protection and control solutions
  • Robust network security enabling Critical Infrastructure Protection through user command logging, and dual permission access control
  • Application flexibility with multiple I/O options and programmable logic (FlexLogic™)
  • High-end fault and disturbance recording eliminating the need for redundant recording devices
  • Ambient temperature monitoring with alarms when outside temperature exceeds upper thresholds
  • High-speed peer-to-peer communications allowing reduction of relay-to-relay wiring and associated installation costs
  • Supports English, French, Russian, Chinese, Turkish and German languages on the front panel, software and manuals
  • Supports latest edition of waveform capture (COMTRADE 2013) simplifying fault records management

Applications

  • Small to medium-sized generators typically driven be steam, gas or hydraulic turbines
  • Distributed generation (DG) interconnect protection
  • Combined generator and transformer in the zone of protection
  • Pumped storage generators
Protection & Control
Monitoring & Metering
Communications
Software & Security
What's New

Key Features

  • 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

Protection & Control

The G30 generator protection system provides comprehensive protection for small to medium-sized steam, hydraulic and combustion-turbine generators as well as applications that have both the generator and transformer in the same zone of protection. The G30 is ideal for protecting single and multi-pole generators with single or split-phase winding configurations of generators. The G30 includes advanced automation and communication capabilities, extensive I/O options, and powerful fault recording features that can simplify fault and disturbance troubleshooting and minimize generator downtime. As part of the UR family, the G30 provides superior protection and control.

Functional Block Diagram

G30 Block Diagram

ANSI® Device Numbers & Functions

Device Number Function
24 Volts Per Hertz
25 Synchrocheck
27P Phase Undervoltage
27TN Third Harmonic Neutral Undervoltage
27X Auxiliary Undervoltage
32 Sensitive Directional Power
40 Loss of Field Relay
46 Generator Unbalance
49 Thermal Overload
50G Ground Instantaneous Overcurrent
50N Neutral Instantaneous Overcurrent
Device Number Function
50P Phase Instantaneous Overcurrent
50SP Split Phase Instantaneous Overcurrent
50/27 Accidental Energization
51G Ground Time Overcurrent
51N Neutral Time Overcurrent
51PV Phase Time Overcurrent with Voltage Restraint
59N Phase Overvoltage
59X Auxiliary Overvoltage
59_2 Negative Sequence Overvoltage
Device Number Function
67_2 Negative Sequence Directional Overcurrent
67N Neutral Directional Overcurrent
67P Phase Directional Overcurrent
81O Overfrequency
81R Rate of Change of Frequency
81U Underfrequency
87GT Generator/Transformer Differential
87G Restricted Ground Fault

Key Features

  • Metering - current, voltage, power, energy, frequency
  • Oscillography – analog and digital parameters at 64 samples/cycle
  • Event Recorder - 1024 time tagged events with 0.5ms scan of digital inputs
  • Data Logger - 16 channels with sampling rate up to 1 sample / cycle
  • Setting for security audit trails for tracking changes to G30 configurations

Monitoring & Diagnostics

Monitoring & Diagnostics

The G30 is the single point for protection, control, metering, and monitoring in one integrated device that can easily be connected directly into HMI or SCADA monitoring and control systems like Viewpoint Monitoring as shown.

Advanced Automation

The G30 incorporates advanced automation features including powerful FlexLogic™ programmable logic, communication, and SCADA capabilities that far surpass what is found in the average generator relay. The G30 integrates seamlessly with other UR relays for complete system protection, including unit and auxiliary transformers, and balance of plant protection.

Advanced Automation

FlexLogic allows for the customization of the G30 to operate and control the breakers and other auxiliary devices needed to fit most generator protection schemes and applications.

Key Features

  • Complete IEC 61850 Process Bus solution providing resource optimization and minimizing total P & C life cycle costs
  • Three independent 100Mbps Ethernet ports enable purpose specific LAN support that eliminates latency effect of heavy traffic protocols on mission critical communication services
  • Embedded IEEE 1588 time synch protocol support eliminates dedicated IRIG-B wiring requirements for IEDs
  • Direct I/O secures high-speed exchange of binary data between URs
  • Increase network availability by reducing failover time to zero through IEC62439-3 “PRP” support

Advanced Communications

The G30 provides advanced communications technologies for remote data and engineering access, making it the easiest and most flexible generator protection relay to use and integrate into new and existing infrastructures. Direct support for fiber optic Ethernet provides high-bandwidth communications allowing for low-latency controls and high-speed file transfers of relay fault and event record information. The available three independent and redundant Ethernet options provide the means to create fault tolerant communication architectures in an easy, cost-effective manner.

The G30 supports the most popular industry standard protocols enabling easy, direct integration into DCS and SCADA systems.

  • IEC 61850 Ed. 2 with 61850-9-2 (process bus) support
  • DNP 3.0 (serial & TCP/IP)
  • Ethernet Global Data (EGD)
  • IEC 60870-5-103 and IEC 60870-5-104
  • Modbus RTU, Modbus TCP/IP
  • HTTP, TFTP, SFTP and MMS file transfer
  • SNTP and IEEE 1588 for time synchronization
  • PRP as per IEC 62439-3
  • Supports Routable GOOSE (R-GOOSE)

UR Switch Module

UR Switch Module

In addition to providing high-speed connectivity directly to your Universal Relay, the UR Switch Module provides an additional 4 fiber Ethernet ports, for connection to other relays in the system as well as upstream connectivity. It also provides 2 RJ45 copper Ethernet ports which can be used to connect local devices such as PCs, meters, or virtually anything else in the system.

The UR Switch Module provides a simple way to add fully-managed Ethernet networking to your relays and devices without the need for additional hardware or a dedicated communications cabinet.

The UR Switch Module includes all of the management and features that come with all MultiLink managed switches, and can be easily integrated into a network that has other Ethernet switches.

When used in a ring topology with other UR Switch Modules or MultiLink Switches, the UR Switch Module can be configured to use MultiLink’s Smart RSTP feature to provide industry-leading network recovery for ring topologies, at a speed of less than 5ms per switch. Learn More

Interoperability with Enbedded IEC 61850

Use the G30 with integrated IEC 61850 to lower costs associated with generator protection, control and automation. GE’s leadership in 
IEC 61850 comes from thousands of installed devices and follows on years of development experience with UCA 2.0.

The G30’s IEC 61850 Process Bus module is designed to interface with the Multilin HardFiber System, allowing bi-directional IEC 61850 fiber optic communications. The HardFiber System is designed to integrate seamlessly with existing Universal Relay applications, including protection functions, FlexLogic, metering and communications. Learn more

Cyber Secutrity - CyberSentry™ UR (FW v7.4xx)

CyberSentry enables UR devices to deliver full cyber security features that help customers to comply with NERC CIP and NITIR 7628 cyber security requirements through supporting the following core features:

Password Complexity

Supporting up to 20 alpha- numeric or special characters, UR passwords exceed NERC CIP requirements for password complexity. Individual passwords per role are available.

AAA Server Support (Radius)

Enables integration with centrally managed authentication and accounting of all user activities and uses modern industry best practices and standards that meet and exceed NERC CIP requirements for authentication and password management.

Role Based Access Control (RBAC)

Efficiently administrate users and roles within UR devices. The new and advanced access functions allow users to configure up to five roles for up to eight configurable users with independent passwords. The standard “Remote Authentication Dial In User Service” (Radius) is used for authentication. 

Event Recorder (Syslog for SEM)

Capture all cyber security related events within a SOE element (login, logout, invalid password attempts, remote/local access, user in session, settings change, FW update, etc), and then serve and classify data by security level using standard Syslog data format. This enables UR devices integration with established SEM (Security Event Management) systems.

EnerVista™ Software

The EnerVista™ suite is an industry-leading set of software programs that simplifies every aspect of using the G30 relay. The EnerVista™ suite provides all the tools to monitor the status of the protected asset, maintain the relay, and integrate information measured by the G30 into DCS or SCADA monitoring systems. Convenient COMTRADE and Sequence of Events viewers are an integral part of the UR setup software included with every UR relay, to carry out postmortem event analysis and ensure proper protection system operation. Learn More

Enervista Software

New and Enhanced Communication Capabilities

  • Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation, which enables wide area protection and control applications (FW v7.40)
  • Increases GOOSE message reception up to 64 remote devices (FW v7.40)
  • IEC 61850 in line with Edition 2, IEC 61850 SCL file for all relay's setting (FW 7.30)
  • Three independent Ethernet ports
  • Time synchronization via IEEE 1588 (FW v7.00)
  • PRP as per IEC 62439-3 (FW 7.10)
  • IEC 60870-5-103 (FW v7.20)
  • New IRC module that combines C37.92 multimode and direct connection singlemode (FW v7.20)

Cyber Security - CyberSentry UR (FW v7.xx)

CyberSentry enables UR devices to deliver full cyber security features that help customers to comply with NERC CIP and NITIR 7628 cyber security requirements through supporting the following core features:

  • Password Complexity
  • AAA Server Support (Radius)
  • Role Based Access Control (RBAC)
  • Event Recorder (Syslog for SEM)

Fully Compatible with GE's Multlilin HardFiber System - Provides support for GE's IEC 61850 HardFiber Process Bus Solution:

Complete IEC 61850 Process Bus Solution providing resource optimization and minimizing total P&C life cycle costs. Learn more

Extended Oscillography Records (FW v7.xx)

  • Supports IEEE C37.111-1999/2013, IEC 60255-24 Ed 2.0 COMTRADE 2013 standard (FW v7.40)
  • Configurable events allow for records of up to 45s at 64 samples per cycle

New and Enhanced Protection and Control Functionality

  • New thermal overload element (FW version 5.90)
  • New stator ground generator protection module "GPM-S"
  • New rotor ground generator protection module "GPM-F"
  • New CT failure element for increased current differential selectivity (FW version 7.00)
  • Neutral directional overcurrent with dual polarity criteria "67N" (FW v 7.20)