5-252 F60 Feeder Protection System GE Multilin5.7 CONTROL ELEMENTS 5 SETTINGS55.7.10 DIGITAL ELEMENTSPATH: SETTINGS CONTROL ELEMENTS DIGITAL ELEMENTS DIGITAL ELEMENT 1(48)Digital elements run once per power system cycle.As such they can easily fail to react to an input signal or a block signal with a duration less than one power systemcycle. This also means that digital element output can react up to one power system cycle later than the pickup andreset delay settings indicate.Do not use digital elements with transient signals, such as communications commands. Do not use digital elementswhere random delays of up to one cycle cannot be tolerated, such as in high speed protection.There are 48 identical digital elements available, numbered 1 to 48. A digital element can monitor any FlexLogic operandand present a target message and/or enable events recording depending on the output operand state. The digital elementsettings include a name which will be referenced in any target message, a blocking input from any selected FlexLogic oper-and, and a timer for pickup and reset delays for the output operand.• DIGITAL ELEMENT 1 INPUT: Selects a FlexLogic operand to be monitored by the digital element.• DIGITAL ELEMENT 1 PICKUP DELAY: Sets the required time delay from element pickup to element operation. If apickup delay is not required, set to "0". To avoid nuisance alarms, set the delay greater than the operating time of thebreaker.• DIGITAL ELEMENT 1 RESET DELAY: Sets the time delay to reset. If a reset delay is not required, set to “0”.• DIGITAL ELEMENT 1 PICKUP LED: This setting enables or disabled the digital element pickup LED. When set to“Disabled”, the operation of the pickup LED is blocked. DIGITAL ELEMENT 1DIGITAL ELEMENT 1FUNCTION: DisabledRange: Disabled, EnabledMESSAGE DIG ELEM 1 NAME:Dig Element 1Range: 16 alphanumeric charactersMESSAGE DIG ELEM 1 INPUT:OffRange: FlexLogic operandMESSAGE DIG ELEM 1 PICKUPDELAY: 0.000 sRange: 0.000 to 999999.999 s in steps of 0.001MESSAGE DIG ELEM 1 RESETDELAY: 0.000 sRange: 0.000 to 999999.999 s in steps of 0.001MESSAGE DIG ELEMENT 1PICKUP LED: EnabledRange: Disabled, EnabledMESSAGE DIG ELEM 1 BLOCK:OffRange: FlexLogic operandMESSAGE DIGITAL ELEMENT 1TARGET: Self-resetRange: Self-reset, Latched, DisabledMESSAGE DIGITAL ELEMENT 1EVENTS: DisabledRange: Disabled, EnabledNOTE
