Diagram explaining transmission protection systems to detect and isolate grid faults

Transmission Protection

Delivering the speed and security necessary for advanced transmission line protection

Typical applications

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

Directional Overcurrent

Directional Overcurrent
Typical Functions
67PPhase directional overcurrent
67NNeutral directional overcurrent
25Synchrocheck
79Reclosing
V, SVoltage and Power metering
FunctionsTypical Product Order Code
Typical FunctionsF60-N00-HCH-F8L-H6P-MXX-PXX-UXX-WXX
AlternativeD30-N00-HCH-F8L-H6P-MXX-PXX-UXX-WXX
HardFiber IEC 61850 Process BusF60-N00-HCH-FXX-H81-MXX-PXX-UXX-WXX
D30-N00-HCH-FXX-H81-MXX-PXX-UXX-WXX

Directional Overcurrent - Dual Breaker

Directional Overcurrent - Dual Breaker
Typical Functions
67PPhase directional overcurrent
67NNeutral directional overcurrent
25Synchrocheck
79Reclosing
V, SVoltage and Power metering
FunctionsTypical Product Order Code
Typical FunctionsD60-N02-HCH-F8L-H6P-M8L-PXX-UXX-WXX
External summation of breaker
currents (traditional method)		F60-N00-HCH-F8L-H6P-MXX-PXX-UXX-WXX
D30-N00-HCH-F8L-H6P-MXX-PXX-UXX-WXX
D60-N00-HCH-F8L-H6P-MXX-PXX-UXX-WXX
HardFiber IEC 61850 Process BusF60-N00-HCH-FXX-H81-MXX-PXX-UXX-WXX
D30-N00-HCH-FXX-H81-MXX-PXX-UXX-WXX
D60-N00-HCH-FXX-H81-MXX-PXX-UXX-WXX

Stepped-Distance Protection

Stepped-Distance Protection
Typical Functions
21PPhase distance Ground distance Phase
21Gdirectional overcurrent Neutral
67Pdirectional overcurrent Breaker Failure
67NSynchrocheck Reclosing Voltage and Power metering
50BF 
25 
79 
V, S 
FunctionsTypical Product Order Code
Typical FunctionsD30-N00-HCH-F8L-H6P-MXX-PXX-UXX-WXX
Alternative ModelsD60-N00-HCH-F8L-H6P-MXX-PXX-UXX-WXX
D90P-AE-SS01SSS-XHXAXAXX01X
SynchrophasorsD60-N06-HCH-F8L-H6P-MXX-PXX-UXX-WXX
D90P-AE-SS01PSS-XHXAXAXX01X
HardFiber IEC 61850 Process BusD60-N00-HCH-FXX-H81-MXX-PXX-UXX-WXX
D30-N00-HCH-FXX-H81-MXX-PXX-UXX-WXX

Stepped-Distance Protection - Dual Breaker

Stepped-Distance Protection - Dual Breaker
Typical Functions
21PPhase distance
21GGround distance
67PPhase directional overcurrent Neutral
67Ndirectional
50BFovercurrent
25Breaker Failure
79Synchrocheck
V, SReclosing Voltage and Power metering
FunctionsTypical Product Order Code
Typical FunctionsD60-N02-HCH-F8L-H6P-M8L-PXX-UXX-WXX
D90P-AE-SS01SSS-XHXAXAXX01X
External summation of breaker
currents (traditional method)		D30-N00-HCH-F8L-H6P-MXX-PXX-UXX-WXX
D60-N00-HCH-F8L-H6P-MXX-PXX-UXX-WXX
SynchrophasorsD60-N08-HCH-F8L-H6P-M8L-PXX-UXX-WXX
D90P-AE-SS01PSS-XHXAXAXX01X
HardFiber IEC 61850 Process BusD60-N00-HCH-FXX-H81-MXX-PXX-UXX-WXX