SecoGear Medium-voltage Switchgear Application and Technical Guide DET-882
ii ©2017 General Electric All Rights Reserved
TABLE OF CONTENTS
SECTION 1. SecoGear Switchgear Concepts and Basic Configurations ...................................................................................... 1
SecoGear Metal-clad Switchgear ............................................................................................................................................................................................... 1
Switchgear Standards ...................................................................................................................................................................................................................... 3
Underwriters Laboratories, Inc. (UL) .................................................................................................................................................................................... 3
Service Conditions ........................................................................................................................................................................................................................ 3
Temperature ................................................................................................................................................................................................................................ 3
Humidity ........................................................................................................................................................................................................................................ 3
Altitude ........................................................................................................................................................................................................................................... 3
Applicable Industry Standards............................................................................................................................................................................................... 3
Modular Construction and Typical Sectional Views ......................................................................................................................................................... 3
Modular Compartments ............................................................................................................................................................................................................ 3
Rollout Configurations ................................................................................................................................................................................................................ 5
Two-High Breaker and Auxiliary Stacking ....................................................................................................................................................................... 6
SECTION 2. Circuit Breaker Selection.............................................................................................................................................. 10
Circuit Breaker Ratings .................................................................................................................................................................................................................. 10
Selection Considerations .............................................................................................................................................................................................................. 10
Circuit Voltage .............................................................................................................................................................................................................................. 10
System Frequency .................................................................................................................................................................................................................... 10
Short-Circuit Current ................................................................................................................................................................................................................ 10
Closing and Latching Current .............................................................................................................................................................................................. 11
Continuous Current ................................................................................................................................................................................................................... 11
Rated Interrupting Time .......................................................................................................................................................................................................... 11
Duty Cycle...................................................................................................................................................................................................................................... 11
Special Switching Applications ................................................................................................................................................................................................. 11
Automatic Transfer ................................................................................................................................................................................................................... 11
Capacitor Switching .................................................................................................................................................................................................................. 12
Service Conditions ........................................................................................................................................................................................................................... 12
Usual Service Conditions ........................................................................................................................................................................................................ 12
Unusual Service Conditions .................................................................................................................................................................................................. 12
Abnormal Temperature ...................................................................................................................................................................................................... 12
Temperature Rise................................................................................................................................................................................................................... 12
High Altitude ............................................................................................................................................................................................................................. 12
Breaker Accessories ....................................................................................................................................................................................................................... 13
Breaker Lift Truck ............................................................................................................................................................................................................................. 13
Related Circuit Breaker References ........................................................................................................................................................................................ 14
Typical Breaker Device Internals ............................................................................................................................................................................................. 16
SECTION 3. Control Power Equipment ............................................................................................................................................ 18
Control Power Requirements ..................................................................................................................................................................................................... 18
Breaker Close and Trip Considerations .......................................................................................................................................................................... 18
Breaker Tripping ......................................................................................................................................................................................................................... 18
DC Battery Trip ........................................................................................................................................................................................................................ 19
SecoVac Autocharge Capacitor Trip Device............................................................................................................................................................ 19
Direct Acting Undervoltage Trip Device ..................................................................................................................................................................... 19
Breaker Closing ........................................................................................................................................................................................................................... 19
Indicating Lamps ........................................................................................................................................................................................................................ 20
Relaying ................................................................................................................................................................................................................................................ 20
Excitation Power ............................................................................................................................................................................................................................... 20
Other Loads ......................................................................................................................................................................................................................................... 20
Control Power Source Selection ............................................................................................................................................................................................... 21
DC Control Power Equipment .............................................................................................................................................................................................. 21
Battery Systems ......................................................................................................................................................................................................................... 21
Lead-Acid Batteries .............................................................................................................................................................................................................. 21
Nickel-Cadmium Batteries ................................................................................................................................................................................................ 21
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