Multilin B90 Low Impedance Bus Protection System

Description

Overview

Essential details：Multilin B90 Low Impedance Bus Protection System

The Multilin B90 bus protection relay, a member of the UR Family, features integrated protection and breaker failure for re-configurable MV, HV, EHV multi-section busbars with up to 24 feeders. Use one or more B90 relays together to build a flexible protection system that can be engineered to meet specific application requirements. The B90 performs fast and secure low-impedance bus protection with a sub-cycle tripping time of 0.75 cycles and 06 differential zones per phase.

Key Benefits

High-speed protection algorithm for enhanced stability with trip times of 0.75 power cycle with CT saturation detector that operates with only 2 msec of saturation-free current
Superior CT saturation detector that operates with only 2 msec of saturation-free current
Suitable for different bus configurations, scalable architecture to protect up to 24 feeders
Advanced IEC61850 Ed. 1 and Ed. 2 certified implementation and complete setting in a single SCL file ensures interoperability, device management optimization and reduced cost of ownership
Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation
Advance Cyber security features “CyberSentryTM” that helps meet modern industry requirements
Integrated isolator position monitoring, alarming and dynamic bus replica
Application flexibility with multiple I/O options including high density I/O, programmable logic, modularity, and specific customization
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
Applications

Single bus, breaker-and-half busbar configurations, double Bus and triple Bus with and without bus couplers
Re-configurable multi-section busbar with up to 24 feeders

Multilin B90

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Multilin B90 Low Impedance Bus Protection System

As part of the UR family of Protection & Control devices, the B90 offers a high degree of modularity in its design and functionality, providing superior performance while meeting the toughest requirements of the marketplace. Advanced protection and control features of this relay includes:
Segregated Bus Differential Protection The B90 provides fast and secure low impedance bus protection with sub-cycle tripping times averaging 0.75 cycles. Multiple phasesegregated zones of differential protection are available in the B90. The primary protection is based on differential and directional protection principles, and uses a dedicated CT saturation mechanism for additional through-fault stability. This mechanism is capable of detecting saturation of CTs as quickly as two milliseconds into an external fault. The overall system costs can be reduced with the B90 since there is no need for dedicated or interposing, external CTs. It offers extreme flexibility, including a CT ratio mismatch of up to 32:1 between feeders, making the B90 an ideal solution in a wide variety of bus differential applications.

The B90 is based on a centralized phasesegregated architecture that does not rely on extensive communications between IEDs, an approach that increases overall reliability.
This architecture allows for greater flexibility and is scalable to any low impedance busbar protection application, all in a relatively small form factor. Each unit in the system is capable of exchanging digital states quickly and reliably over direct I/O, allowing the user to distribute input and output contacts in various IEDs.
The B90 protection system can incorporate as few as one IED and as many as five IEDs to accommodate a wide range of applications.
This scalability and flexibility allows for optimum hardware utilization with an overall lower system cost, which was was not previously possible. A single B90 configuration is available to protect up to 8 feeders. A more typical B90 configuration for non-re-configurable busbars, without breaker fail protection, consists of three B90s. This configuration can protect up to 24 feeders. Each B90 in the system can