GE GEK 106168E manual Power Supply, Keyboard and Display

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5. HARDWARE DESCRIPTION

5.2.3 POWER SUPPLY

The DBF power supply can be 48-125 VDC or 110-250 VDC rated. The operating margin of the power supply is + 20%, and is galvanically isolated from the rest of the relay's circuits. The power supply provides ± 12 VDC to the analog circuitry and the output relays, and ± 5 VDC for the digital circuits.

5.2.4 KEYBOARD AND DISPLAY

The DBF display at the front of the relay is liquid crystal type and consists of two rows of 16 characters each. The display has background light with variable lightness adjustable by a potentiometer located on the rear of the front cover plate.

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DBF Breaker Failure Protection

GEK-106168E

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Contents GE Power Management 3KRQHHVFULSWLRQ0DQXDO*RI.\RXUFRGHTXHVWLRQ Ruvxjjhvwlrqd Page Table of Contents Installation and Maintenance Rear View 226B7412 Sheet List of FiguresDBF Breaker Failure Protection GEK-106168E Analysis General DescriptionProtection ∙ Breaker internal arc detection MonitoringDBF Breaker Failure Protection GEK-106168E Low-Level Overcurrent Breaker Failure Unit 50BF 1P Digital Signal Input # TerminalsProtection Functions Overcurrent UnitsBreaker Arc Detection Device Reset of Latching RelaysGround Overcurrent Breaker Failure Unit Breaker Failure without current or very low currentAssociated Breaker Status Internal Protection Status SignalsMonitoring and Recording Functions MeasurementGroup Status Comment Optional Exp. Board Optional Exp.Boar Latched#2 Closed Optional Exp. Board Latched#1Closed Internal Communication Status Signals Circuit Breaker Breaking Capacity Monitoring LED Left Column Right ColumnOscillography Analysis FunctionsBUILT-IN SELF-CHECKING Unit Event RecorderEvents to Trigger Oscillography INPUT-1 INPUT-0 Tables of SettingsControl Table Selection Active TableFunction Configurable Inputs and OutputsTime Synchronization Outputs MAN-MACHINE Interface HMI Remote Communications Active table setting group Breaker Setting GroupFunctions Permitted Common to all tables Range Default Step Oscillography MaskIndependent for each table Range Default Step 50BF Settings Internal Arc SettingsComments on Settings DBF Breaker Failure Protection GEK-106168E Ground Ranges Models DBF PhaseModel List DBFElectrical Technical CharacteristicsMechanical Test Standard Class CommunicationsStandards DBF Breaker Failure Protection GEK-106168E Internal Construction Physical DescriptionCase Electrical ConnectionsDBF Breaker Failure Protection GEK-106168E CPU Board Operating TheoryMagnetic Module Keyboard and Display Power SupplyPanel Insulation Tests Connections and Necessary EquipmentVisual Inspection Power Supply Relay SettingIndicators Communications IRIG-B Synchronizing Input InputsDigital Inputs 1 50BF 1P Unit Test Functions2 50BF 3P Unit Test Neutral Overcurrent Unit Test Internal ARC Test4 3P no I Function DBF Breaker Failure Protection GEK-106168E Timing Measurement Relay Measurement TestsCurrent Measurement DBF Breaker Failure Protection GEK-106168E CONNECTION-TO-GROUND and Disturbances Suppression InstallationMaintenance DBF Breaker Failure Protection GEK-106168E DBF General Electric Keyboard and DisplayACT Menu TreeSET INFView Protection Settings Settings Group SET KEYView Settings Protection Modify Settings ProtectionConfirm Level Valid Range Setting OUT RangeStatus Information Group INF KEYSET DATE/TIME Control Group ACT KEYSingle KEY Menu Configuration Menu DBF Breaker Failure Protection GEK-106168E Figures Breaker Failure Logic 189C4114 Sheet External Connections 189C4114 Sheet Front View 226B7412 H9 Rear View 226B7412H10 Dimensions Diagram 226B6086H10 Panel Drilling 226B6086H10 RS232 Connection DBF Relay to PC