DET-882 SecoGear Medium-voltage Switchgear Application and Technical Guide
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Battery Capacity and Sizing ................................................................................................................................................................................................. 21
Battery Chargers ......................................................................................................................................................................................................................... 22
AC Control Power Equipment ..................................................................................................................................................................................................... 23
Application ...................................................................................................................................................................................................................................... 23
Selection .......................................................................................................................................................................................................................................... 23
Guide to Estimating Heat Loss................................................................................................................................................................................................... 24
SECTION 4. System and Equipment Protection ............................................................................................................................. 25
Basic System Protection ............................................................................................................................................................................................................... 28
Phase Overcurrent Protection.............................................................................................................................................................................................. 28
Incoming Lines ......................................................................................................................................................................................................................... 28
Feeders ........................................................................................................................................................................................................................................ 28
Feeder Ties ................................................................................................................................................................................................................................. 28
Bus Ties ........................................................................................................................................................................................................................................ 28
Transformers ............................................................................................................................................................................................................................ 28
Generators ................................................................................................................................................................................................................................. 28
Ground Overcurrent Protection .......................................................................................................................................................................................... 29
Incoming Lines ......................................................................................................................................................................................................................... 29
Feeders ........................................................................................................................................................................................................................................ 29
Transformers and Generators ......................................................................................................................................................................................... 30
Directional Phase Overcurrent Protection ..................................................................................................................................................................... 30
Directional Ground Overcurrent Protection.................................................................................................................................................................. 30
High Impedance Ground Fault Detection ...................................................................................................................................................................... 30
Differential Protection .............................................................................................................................................................................................................. 30
Bus Protection .......................................................................................................................................................................................................................... 31
Transformer Protection ....................................................................................................................................................................................................... 31
Motors........................................................................................................................................................................................................................................... 31
Transmission Line ................................................................................................................................................................................................................... 31
Generators ................................................................................................................................................................................................................................. 31
Open Phase Protection ............................................................................................................................................................................................................ 31
Automatic Reclosing ................................................................................................................................................................................................................. 31
Directional Power, Underfrequency, and Undervoltage Protection ................................................................................................................ 32
Arc Flash Detection .......................................................................................................................................................................................................................... 32
Basic Equipment Protection ........................................................................................................................................................................................................ 32
Circuit Breaker Control and Control Power Protection ........................................................................................................................................... 32
Instrumentation, Current, and Voltage Transformers ............................................................................................................................................. 33
AM and VM Scales .................................................................................................................................................................................................................. 33
CT and VT Ratios ..................................................................................................................................................................................................................... 33
Metering and Test Block .......................................................................................................................................................................................................... 34
Control and Transfer Switches ........................................................................................................................................................................................ 34
Surge Protection .......................................................................................................................................................................................................................... 34
ANSI Device Functions and Acronyms .................................................................................................................................................................................. 34
SECTION 5. SecoGear Switchgear Applications............................................................................................................................. 37
Glossary: Basic Equipment Applications .............................................................................................................................................................................. 37
General-Purpose Feeders (GPF) ................................................................................................................................................................................................ 38
Protective Scheme Selection ................................................................................................................................................................................................ 38
Optional Equipment Selection.............................................................................................................................................................................................. 38
Protection ................................................................................................................................................................................................................................... 38
Current Transformers for Differential Circuits......................................................................................................................................................... 38
Indication .................................................................................................................................................................................................................................... 38
Control .......................................................................................................................................................................................................................................... 39
Transformer Primary Feeders (TPF) ......................................................................................................................................................................................... 40
Protective Scheme Selection ................................................................................................................................................................................................ 40
Optional Equipment Selection.............................................................................................................................................................................................. 40
Single-Source Incoming Lines (SSIL), or Dual Source with Normally Open Tie Breakers ............................................................................ 40
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