Bus protection ensures fault isolation in substations to maintain power system stability and reliability

Bus Protection

Providing enhanced reliability through advanced protection for a wide range of bus protection applications.

Typical applications

Select a typical application to view the associated one line diagram, functions, and product order codes.

Single Bus Bar, 8 Feeders Or Less, 1 Zone

Single Bus Bar, 8 Feeders Or Less, 1 Zone typical functions
Typical Functions
87BBus Differential
86Lockout auxiliary
50/51TOC and IOC (Phase, ground, neutral)
FunctionsTypical Product Order Code
Typical Functions (Phase segregated bus differential)
+ check zone		B90-N00-HPH-F8H-H6C-L8H-N6C-S8H-U6D-WXX
B90-N00-HPH-F8H-H6C-L8H-N6C-S8H-U6D-WXX
Alternative
+ check zone		B30-N03-HPH-F8N-H6C-L8N-N6C-S8N-U6C-WXX
B30-N03-HPH-F8N-H6C-L8N-N6C-S8N-U6C-WXX
Alternative (high Impedance
bus differential)		MIB-3-0-HI-C-E-000-00
AlternativeB30-N03-APH-F8N-H6C-L8N-N6C-S8N-U6C-WXX
Auxiliary lockout relayHEA61-A-RU-220-X2

Double Busbar, 24, Feeders Or Less, Multiple Zones

Double Busbar, 24, Feeders Or Less, Multiple Zones
Typical Functions
87BBus Differential
87BCheck Zone
86Lockout auxiliary
50/51TOC and IOC (Phase, ground, neutral)
50BFBreaker Failure
End Zone Fault
FunctionsTypical Product Order Code
Typical Functions (Phase
segregated bus differential)		B90-N03-HPH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)
Alternative (high Impedance
bus differential)		MIB-3-0-HI-C-E-000-00
Harsh Environment
Conformal Coating		B90-N03-APH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)
Auxiliary lockout relayHEA61-A-RU-220-X2

Breaker-and-Half Busbar, 24 Feeders Or Less, Multiple Zones

Breaker-and-Half Busbar, 24 Feeders Or Less, Multiple Zones
Typical Functions
87BBus Differential
87BCheck Zone
86Lockout auxiliary
50/51TOC and IOC (Phase, ground, neutral)
FunctionsTypical Product Order Code
Typical Functions (Phase
segregated bus differential)		B90-N03-HPH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)
Alternative (high Impedance
bus differential)		MIB-3-0-HI-C-E-000-00
+ Harsh Environment
Conformal Coating		B90-N03-APH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)
Auxiliary lockout relayHEA61-A-RU-220-X2

Two Section Busbar With A Bus Tie, 24 Feeders, Multiple Zones

Two Section Busbar With A Bus Tie, 24 Feeders, Multiple Zones
Typical Functions
87BBus Differential
87BCheck Zone
86Lockout auxiliary
50/51TOC and IOC (Phase, ground, neutral)
FunctionsTypical Product Order Code
Typical Functions (Phase
segregated bus differential)		B90-N03-HPH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)
Alternative (high Impedance
bus differential)		MIB-3-0-HI-C-E-000-00
+ Harsh Environment
Conformal Coating		B90-N03-APH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)
Auxiliary lockout relayHEA61-A-RU-220-X2

Double Busbar With Transfer Bus And Tie-Breaker

Double Busbar With Transfer Bus And Tie-Breaker
Typical Functions
87BBus Differential
87BCheck Zone
86Lockout auxiliary
50/51TOC and IOC (Phase, ground, neutral)
FunctionsTypical Product Order Code
Typical Functions (Phase
segregated bus differential)		B90-N03-HPH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)
Alternative (high Impedance
bus differential)		MIB-3-0-HI-C-E-000-00
+ Harsh Environment
Conformal Coating		B90-N03-APH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)
Auxiliary lockout relayHEA61-A-RU-220-X2

Triple Busbar

Typical Functions
87BBus Differential
87BCheck Zone
86Lockout auxiliary
50/51TOC and IOC (Phase, ground, neutral)
FunctionsTypical Product Order Code
Typical Functions (Phase
segregated bus differential)		B90-N03-HPH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)
Alternative (high Impedance
bus differential)		MIB-3-0-HI-C-E-000-00
+ Harsh Environment
Conformal Coating		B90-N03-APH-F8H-H6C-L8H-N6C-S8H-U6C-WXX
(3 B90s required)