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UR Family Firmware 5.81 - Release Notes
Firmware 5.81
Line Differential Systems L90, L60, L30
N The Line Current Differential Systems to support hybrid conventional–HardFiber line terminal wiring
Products: L30, L90
Corrected firmware: 5.81
Description: This FW version enables the L90 Line Current Differential System to support hybrid wiring
configurations where one line terminal uses traditional wiring, and the other line terminal uses the
HardFiber technology. This applies for two and three-line terminal schemes. Previous firmware versions
supported either traditional or HardFiber wiring when both line terminals had the same kind of wiring
(both traditional or both HardFiber).
GE tracking number: 581-1
Common Protection Elements
P
Ground Time Overcurrent elements have been changed to use the correct signal input when set to
“phasor”
Products: B30, C60, C70, D30, D60, F35, F60, G30, G60, L30, L60, L90, M60, T35, T60
Corrected firmware: 5.81
Description: The “input setting” within the overcurrent elements determines the type of signal input the
elements use for operation. Phasors or RMS current can be set to the “input setting.” Changes to the
Ground Time Overcurrent elements ensure that they operate based on the ground current phasor
magnitude when their “input setting” is “phasor.” Previous firmware versions have the Ground Time
Overcurrent elements operating based on the “RMS” current value whether “RMS” or “phasor” were set to
the “input setting”.
GE tracking number: 581-2
P
The Synchrocheck elements have been changed to correctly detect a dead source when set to “DV1
XOR DV2”
Products: C60, D30, D60, F60, G30, G60, L30, L60, L90, N60, T60
Corrected firmware: 5.81
Description: When the “Dead Source Select” setting within the Synchrocheck element is set to “DV1 XOR
DV2,” the element has to determine two conditions: a) one of the sources is dead evaluating existing
voltage vs. the “Dead V1/2 Max Volts” setting, and b) the other source is live evaluating existing voltage vs.
the “Live V1/2 Min Volts” setting. Previous firmware versions have the Synchrocheck elements verifying
dead source by evaluating the existing voltage vs. the “Live V1/2 Min Volts” setting when set as mentioned
above. And then the element incorrectly declares dead source. Changes to the Synchrocheck elements
ensure that they evaluate the existing voltage vs. the right setting. This issue does not affect customers
who have the “Dead Source Select” setting set different to “DV1 XOR DV2”.
GE tracking number: 581-3
P
The Autoreclose element has been changed to ensure it goes to “lockout” state when the element is
blocked and unblocked while in “reclose in progress”
Products: D30, F35, F60, L30
Corrected firmware: 5.81
Description: If the operand set to the “AR Block” setting is activated when a reclose cycle is in progress, the
autoreclose element goes to “Lockout” state. If the “AR Block” is subsequently removed, previous firmware
