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Bus Protection

Home > Grid Automation > Protection Relays > Bus Protection > B30

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Multilin B30
Multiple Sections Low Impedance Busbar Protection

The Multilin B30 bus protection relay features integrated protection, visualization and metering for LV, MV, HV and EHV busbars, providing cost-effective, feature-focused centralized or distributed busbar protection scheme. Use the B30 to protect busbars with up to 6 feeders 2-zones (conventional CT inputs) or up to 16 feeders 6-zones (with process bus module) with up to six 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.

Key Benefits

  • High speed differential protection algorithm for sub-cycle trip times of 0.75 power cycle with CT saturation detection with only 2ms of saturation-free current
  • Multiple ethernet ports for station and process bus with Advanced IEC 61850 Ed. 1 and Ed. 2 certified implementation, complete settings via SCL files and highly flexible process bus support (IEC 61850-9-2LE or IEC 61850-9-2 Hardfiber) ensures interoperability, device managing optimization and reduced cost of ownership
  • Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation
  • Application flexibility with multiple I/O options including high density I/O, programmable logic, modularity, and specific customization
  • Advance Cyber security features “CyberSentryTM” that helps meet modern industry requirements
  • 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 16 feeders and 6 differential zones with breaker failure
  • Conventional CT/VT or digital S/S via IEC 61850-9-2LE or IEC 61869 process bus
  • Centralized (six feeders, two zones) or distributed (sixteen feeders, six zones) busbar schemes
  • Integrated bus differential, backup protection visualization and metering for LV, MV, HV and EHV substations
  • CPC schemes - multiple feeders
What's New
Protection & Control
Monitoring & Diagnostic
Software & Security
UR 1 integrated Platform across all 18 applications
Communications icon

New and Enhanced Communication Capabilities

  • New B30 with process bus module supports IEC 61869 sample values, PTP master capabilities and SV switching (FW 7.9x)
  • New UR process bus modules supporting IEC61850-9-2LE Merging Units and IEC61850-9-2 Hardfiber (FW 7.8x) Module Training available here
  • Support switchable IEC 61850 Ed. 1 and Ed. 2 and redundant SNTP (FW 7.7x)
  • New UR front panel with integrated 7” color, graphical display - providing operators with enhanced situational awareness (FW 7.6x)
Cyber security icon

Cyber Security - CyberSentry UR (FW v7.xx)

CyberSentryTM enables UR devices to deliver full cyber security features that help customers to comply with cyber security requirements (NERC CIP, IEEE 1686, IEC 62443, etc):

  • Secured firmware upgrade: FW file includes hash code that enables authentication prior to being used for upgrading UR Relay (FW 7.9x)
IEC 61850 icon

Fully Compatible with IEC 61850-9-2LE or IEC61869 process bus schemes:

  • Can connect to up to 16 merging units over -9-2LE or 61869
  • Supports PRP, HSR, dual HSR and point-to-point process bus topology
  • Provides support for GE’s IEC 61850 HardFiber Process Bus Solution
Oscillography icon

Extended Oscillography Records (FW v7.xx)

  • Increased number of digital and analog channels (FW 7.90)
  • 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
Protection & control icon

Protection and Control Functionality

  • B30 supports up to sixteen feeders and six differential bus zones when equipped with -9-2LE process bus module, end-fault protection, partial P&C blocking due to SV status (FW 7.9).
  • Optional extended feeder protection functionality including auto-reclose, current directional elements synch-check and under-frequency (FW 7.91)

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 can be deployed as either centralized or distributed phase segregated scheme. As centralized Bus Bar Protection, it does not rely on extensive communications between IEDs, an approach that increases overall reliability. As distributed Bus Bar protection, the B30 uses either "61850-9-2LE or IEC61869 merging units" or "61850-9-2 Brick" as bay units. This type of scheme is superior when expecting future busbar expansions.

The B30 bus differential protection system provides secure, sub-cycle low-impedance bus protection for up to sixteen feeders and up to six busbar sections. 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.

Functional Block Diagram

ANSI Device Numbers & Functions

B30 Block Diagram
Device Number Function
25 Synchrocheck
27P Phase Undervoltage
27x Auxiliary undervoltage
49 Thermal Overload Protection
50BF Breaker Failure
50DD Disturbance detector
50EF End Fault Protection
50G Ground Instantaneous Overcurrent
50N Neutral Instantaneous Overcurrent
50P Phase Instantaneous Overcurrent
50/74 CT Trouble
50/87 Unrestrained Bus Differential
51G Ground Time Overcurrent
51N Neutral Time Overcurrent
51P Phase Time Overcurrent
59N Neutral Overvoltage
59P Neutral Overvoltage
59X Auxiliary Overvoltage
67N Neutral directional overcurrent
67P Phase Directional
79 Autoreclose
81U Underfrequency
87B Restrained Bus Differential

Key Features

  • Isolator and breaker status 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 input
  • User configurable fault report
  • Data logger for analog channels

Monitoring & Diagnostic

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.

Advanced Automation

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

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, HSR or dual HSR 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 61850-9-2LE or IEC 61869 point-to-point or networked or IEC61850-9-2 Hardfiber 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
  • Redundant SNTP and IEEE 1588 for time synchronization
  • PRP as per IEC 62439-3
  • Supports Routable GOOSE (R-GOOSE)

Interoperability with Enbedded IEC 61850

Use the B30 with integrated IEC 61850 to lower costs associated with busbar 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.

HardFiber system

The B30’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

The B30 can also connect to GE MU320 or third-party merging units using standard IEC 61869 or IEC 61850-9-2LE communication protocols.

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:

Secure FW upgrade

UR FW files v7.9 and up now include a hash code that allows for authentication prior to being used for upgrading UR devices.

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. Learn More

EnerVista™ Software

Record the operation of the internal B30 elements and external connected devices with 1ms time-stamped accuracy.

EnerVista™ Software

Create B30 setting file templates to ensure critical settings are not altered.