GE UR-6TH Digital Input/Output Module

Two key variables of the Thermal overload protection element have been changed to increase the element’s security: – The “Voltage Dependent Thermal Overload curve” has been modified (10% more Stall current at 100% volts) to give motors a longer acceleration time. This is especially useful when protecting very high inertia motors – Negative sequence currents are now filtered to properly bias the equivalent motor heating current “Ieq” when the relay senses significant motor load changes. If either your thermal overload element is not set for voltage dependent or your relays’ FW version matches any of the listed below, no action is required. FW versions that fix this issue: 5.72 F Changes to the Thermal model element prevent an inadvertent trip event when the relay is powered-up after replacing the PWR supply or pulling out and back in the CPU module.

🛡️ Protection Function Improvements

• L90 Line Differential Relay:
  • Enhanced protection functions
  • Improved alarm operands for greater reliability
• C70 Generator Protection:
  • Compensation factors added for phase current unbalance

🔧 UR Platform Enhancements

Improvements across the UR family include:

• Common Protection Elements:
  • Distance protection
  • Trip bus
  • Restricted ground fault
  • Inter-relay communications
• Communications:
  • Enhanced ports and protocols
• Monitoring & Reporting:
  • Synchrophasor improvements
  • Enhanced event recorder and fault report
• System Features:
  • Real-time clock stability
  • Improved flex-elements
  • Enhanced front panel functionality

⚙️ Upgrade Guidance

• Optional Update:
  Users with existing UR Family relays running older 5.6x firmware can upgrade to 5.61 to take advantage of these enhancements.
• No Mandatory Upgrade:
  If the new features are not required, there is no need to upgrade.

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