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Multilin B30

Multiple Sections Low Impedance Busbar Protection

The Multilin B30 bus protection relay features integrated protection, control and metering for MV, HV and EHV busbars, providing cost-effective, feature-focused busbar protection. Use the B30 to protect busbars with up to 6 feeders with up to two three-phase differential zones. The Multilin B30 relay is a cost-effective alternative to high-impedance schemes, ideal for breaker-and-half bus schemes, with integrated feeder backup protection and metering.

Key Benefits:

  • High speed differential protection algorithm for sub-cycle trip times of 0.75 power cycle

  • Advanced IEC 61850 Ed. 1 and Ed. 2 certified implementation, complete settings via SCL files and IEC 61850-9-2 process bus solution ensures interoperability, device managing optimization and reduced cost of ownership

  • Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation, which enables wide area protection and control applications

  • Superior CT saturation detection with only 2 msec of saturation-free current for enhanced through-fault stability

  • Advanced automation capabilities for providing customized protection and control solutions

  • Application flexibility with multiple I/O options including high density I/O, programmable logic, modularity, and specific customization

  • Robust network security enabling Critical Infrastructure Protection through user command logging, and dual permission access control

  • Simplified system integration supporting serial and Ethernet interfaces and multiple protocols

  • An integrated large, full color display, provides real-time visualization and control of the protected bay, via a bay mimic as well as annunciator functionality and graphical visualization of phasors



  • Re-configurable simple bus applications, up to 6 feeders and 2 differential zones with breaker failure

  • Integrated bus protection and metering for HV and EHV substations

Protection & Control

Key Benefits

  • Differential bus protection with restrained and unrestrained functions

  • Fast and reliable CT saturation detection

  • Breaker failure protection

  • External check-zone

  • CT ratio mismatch compensation

  • Dynamic bus replica

  • Backup time and instantaneous overcurrent elements

  • Undervoltage function for supervision purposes


Protection & Control

The B30 bus differential protection system provides secure, sub-cycle low-impedance bus protection for a single busbar with up to six feeders. The B30 is ideally suited for applications where high-impedance schemes were typically used. Overall system costs can be reduced with the B30, since there is no need for dedicated, or interposing, CTs. The B30 comes with advanced features, such as breaker failure, CT trouble detection, undervoltage supervision, and dynamic bus replica. With its extreme flexibility, which includes a CT ratio mismatch of up to 32:1 between terminals, the B30 is the ideal solution in a wide variety of bus differential applications.

Part of the Universal Relay family, the B30 comes with a variety of versatile features, truly integrating protection, monitoring, metering, communication and control in one easy-to-use relay. The Universal Relay family offers a high degree of modularity in its design and functionality, providing superior performance in protection and control, while meeting the toughest requirements of the marketplace.


Monitoring & Diagnostic

Key Features:

  • Isolator monitoring

  • CT trouble monitoring, VT supervision

  • Metering - current, voltage, frequency, power, energy

  • Oscillography - 64 samples/cycle, up to 64 records

  • Event Recorder - 1024 time tagged events, with 0.5 ms scan of digital inputs

Monitoring & Diagnostic

The B30 is the single point for protection, control, metering, and monitoring in one integrated device that can easily be connected directly into DCS or SCADA monitoring and control systems like Viewpoint Monitoring.

Advanced Automation

The B30 incorporates advanced automation features including powerful FlexLogic programmable logic, communication, and SCADA capabilities that far surpass what is found in the average bus relay. The B30 integrates seamlessly with other UR relays for complete system protection.



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 Multilin B30 bus protection relay provides for secure remote data and engineering access, making it easy and flexible to use and integrate into new and existing infrastructures. 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 B30 supports the most popular industry standard protocols enabling easy, direct integration into DCS and SCADA systems.

  • IEC 61850 Ed. 1/Ed. 2 with 61850-9-2 (Process Bus) and 61850-90-5 (synchrnophasors) 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

  • Redundant SNTP and IEEE 1588 for time synchronization

  • PRP as per IEC 62439-3

  • Supports Routable GOOSE (R-GOOSE)

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. 

Interoperability with Embedded 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. 


Software & Security


Cyber Security - 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 B30 protection 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 B30relay 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. 

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Functional Block Diagram

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ANSI Divice Numbers & Functions

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The B30 is the single point for protection, control, metering, and monitoring in one integrated device that can easily be connected directly into DCS or SCADA monitoring and control systems like Viewpoint Monitoring.

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The internal operation of the B30 elements, logic, and outputs can be monitored in real-time to simplify commissioning and troubleshooting procedures.

B30 Brochure

B30  Manual

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