1 CHAPTER OVERVIEW
This chapter consists of the following sections:
1
Chapter Overview
2 Protection functions
2.1 Motor Starting and Running (stall protection) (48/51LR/50S/14)
2.1.1 Stall Protection Description
2.1.2 Prolonged Start
2.1.3 Locked Rotor During Starting – (stall time < start time)
2.1.4 Stall During Running
2.2 Number of Starts Limitation (66)
2.2.1 Starts Inhibition
2.2.2 Time Between Starts
2.3 Thermal Overload Function
2.3.1 Thermal Replica
2.3.2 Thermal Trip
2.3.3 Thermal Overload Protection Implementation
2.3.4 Thermal Lockout
2.3.5 Inhibit Thermal Trip During Motor Start-up (Inh Trip dur st)
2.3.6 Emergency Restart
2.4 Overcurrent Protection Principles
2.4.1 IDMT Characteristics
2.4.2 Principle of Protection Function Implementation
2.4.3 Timer Hold Facility/Reset Characteristics
2.5 Phase Overcurrent Protection (Motor Short Circuit Protection)
2.5.1 Phase Overcurrent Protection Implementation
2.6 Negative Sequence Overcurrent Protection
2.6.1 Loss of Phase while Starting and Running
2.6.2 Negative Sequence Overcurrent Protection Implementation
2.6.3 Negative Sequence Overcurrent Protection Logic
2.7 Earth Fault Protection
2.7.1 Earth Fault Protection Elements
2.7.2 Earth Fault Protection Logic
2.8 Sensitive Earth Fault Protection
2.8.1 Sensitive Earth Fault Protection (ordering option)
2.9 Restricted Earth Fault Protection
2.9.1 Restricted Earth Fault Implementation
2.9.2 Application Note
2.9.2.1 High Impedance REF
2.10 Loss of Load Protection Function
2.11 Circuit Breaker Fail Protection
2.11.1 Circuit Breaker Fail Implementation
2.11.2 Circuit Breaker Fail Logic
2.12 Inrush Current Blocking Function (2ND Harm Blocking)
2.12.1 Second Harmonic Blocking Implementation
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