GE GEK 106168E manual Installation, CONNECTION-TO-GROUND and Disturbances Suppression, Maintenance

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7. INSTALLATION AND MAINTENANCE

7.

INSTALLATION AND MAINTENANCE

 

 

7.1. INSTALLATION

The relay should be installed in a clean, dry and dust-free place, with no vibrations.

The DBF system is supplied in a 19’’ rack case 2 units high. Figure 5 shows the dimension diagram.

The relay should be mounted on a vertical surface. Figure 6 shows a diagram for panel drilling.

Given that the design of the DBF unit is based on high performance digital technology it is not necessary to calibrate the relay. However if the tests show that it is necessary to readjust the relay, it is recommended to return the unit to the factory to check it.

7.2. CONNECTION-TO-GROUND AND DISTURBANCES SUPPRESSION

The terminal (see Figure 2) should be connected to ground so that the disturbance suppression circuits in the system works correctly. This connection should be as short as possible (preferably 25 cm or less) to guarantee maximum protection. In this way the capacitors that are internally connected between the inputs and ground divert high frequency disturbances directly to ground without passing through the electronic circuits. Then the internal circuitry is perfectly protected.

In addition this connection also guarantees the physical safety of the personnel when handling the relay, since the whole casing is connected to ground.

7.3. MAINTENANCE

Given the important role that the protection relays play in the operation of any installation, a periodic program of tests is highly recommended. The unit incorporates built-in diagnostic functions that permit the fast identification of some of the most likely circuit failures. Testing the unit is recommended at intervals of 2 years or more. Although the built-in diagnosis does not reduce the average time between failures, it does increase the availability of the protection because it allows a drastic reduction in the average interruption time involved in detecting and repairing the fault.

The set of tests which can be performed to test that all aspects of the DBF unit function properly is described in detail in the chapter entitled ACCEPTANCE TESTS.

Since most of the protection and communications functions are integrated in two separate programs, it is unlikely that faults will occur due to problems of wear and tear, short-circuits or aging which are typical in other electromechanical protection systems, whether analogue or hybrid. Moreover, a failure in the communications processor does not affect the protection functions, which are implemented by a dedicated processor.

GEK-106168E

DBF Breaker Failure Protection

39

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Contents GE Power Management 3KRQHHVFULSWLRQ0DQXDO*RI.\RXUFRGHTXHVWLRQ Ruvxjjhvwlrqd Page Table of Contents Installation and Maintenance List of Figures Rear View 226B7412 SheetDBF Breaker Failure Protection GEK-106168E ∙ Breaker internal arc detection Monitoring General DescriptionProtection AnalysisDBF Breaker Failure Protection GEK-106168E Overcurrent Units Digital Signal Input # TerminalsProtection Functions Low-Level Overcurrent Breaker Failure Unit 50BF 1PBreaker Failure without current or very low current Reset of Latching RelaysGround Overcurrent Breaker Failure Unit Breaker Arc Detection DeviceMeasurement Internal Protection Status SignalsMonitoring and Recording Functions Associated Breaker StatusGroup Status Comment Optional Exp. Board Closed Optional Exp. Board Latched#1Optional Exp.Boar Latched#2 Closed Internal Communication Status Signals LED Left Column Right Column Circuit Breaker Breaking Capacity MonitoringEvent Recorder Analysis FunctionsBUILT-IN SELF-CHECKING Unit OscillographyEvents to Trigger Oscillography Table Selection Active Table Tables of SettingsControl INPUT-1 INPUT-0Time Synchronization Configurable Inputs and OutputsFunction Outputs MAN-MACHINE Interface HMI Remote Communications Breaker Setting Group Active table setting groupInternal Arc Settings Common to all tables Range Default Step Oscillography MaskIndependent for each table Range Default Step 50BF Settings Functions PermittedComments on Settings DBF Breaker Failure Protection GEK-106168E DBF Ranges Models DBF PhaseModel List GroundMechanical Technical CharacteristicsElectrical Standards CommunicationsTest Standard Class DBF Breaker Failure Protection GEK-106168E Electrical Connections Physical DescriptionCase Internal ConstructionDBF Breaker Failure Protection GEK-106168E Magnetic Module Operating TheoryCPU Board Power Supply Keyboard and DisplayVisual Inspection Connections and Necessary EquipmentPanel Insulation Tests Indicators Relay SettingPower Supply Communications Digital Inputs InputsIRIG-B Synchronizing Input Functions 1 50BF 1P Unit Test2 50BF 3P Unit Test 4 3P no I Function Internal ARC TestNeutral Overcurrent Unit Test DBF Breaker Failure Protection GEK-106168E Current Measurement Relay Measurement TestsTiming Measurement DBF Breaker Failure Protection GEK-106168E Maintenance InstallationCONNECTION-TO-GROUND and Disturbances Suppression DBF Breaker Failure Protection GEK-106168E Keyboard and Display DBF General ElectricINF Menu TreeSET ACTModify Settings Protection Settings Group SET KEYView Settings Protection View Protection SettingsConfirm Setting OUT Range Level Valid RangeInformation Group INF KEY StatusControl Group ACT KEY SET DATE/TIMESingle 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
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