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UR Family Firmware 5.83 - Release Notes
Firmware 5.83
Capacitor Bank P&C System – C70
P
Neutral Voltage Unbalance Autoset and Voltage Differential Autoset operational when C70 has only
voltage inputs, for example only 8V CT/VT DSPs
Products: C70
Corrected firmware: 5.83, 6.02, 7.20
Description: This firmware version introduces the following fixes to the Neutral Voltage Unbalance and
Voltage Differential elements:
The Autoset functionality of these elements does not change any of the coefficients as expected if the C70
has only voltage inputs, hence this is not an issue if the C70 has any CT bank inputs in its order code.
GE tracking number: 720-04
Line differential protection systems – L30, L90
M Displayed values of 87LG restraint current has been improved to meet +/- 5% accuracy when sensing
low values
Products: L30, L90
Corrected firmware: 5.83, 6.01
Workaround: Not applicable
Description: The restraint current values of the ground differential element are accurately derived and
used by the line differential algorithm. However, the restraint values of the ground differential element
that are displayed by the relay might not meet the design accuracy of +/- 5% when restraint current
values are below 0.11xIn.
These changes do not affect the operation of the ground line differential element, but only restraint
current values that are displayed.
GE tracking number: 601-3
E
Increased availability of the line differential element when experiencing short communication
disruptions
Products: L30
Corrected firmware: 5.83, 6.01
Workaround: Not applicable
Description: When the line differential element 87L is enabled, the interval between consecutive incoming
packets on the inter-relay communication channels is monitored. When this interval between packets
exceeds 66 milliseconds, a channel failure is declared. This FW version extends the allowed interval
between packets from 66 to 100 milliseconds. This change reduces the sensitivity of the channel failure
detector and prevents short communication disruptions from repeatedly taking the line differential
protection out of service.
GE tracking number: 601-1
H
Line differential element to ensure all three terminals correctly trip when the differential scheme is
set with 50DD SV supervision and is operating in master slave mode
Products: L30, L90
Corrected firmware: 5.83, 6.01
Workaround: Not applicable
