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M E M S A

This document outlines the fully automatic backup generator system presented by Larry Casson from Drummond Co., Inc. at the M.E.M.S.A. Mining Electrical Maintenance and Safety Association in Clearwater, FL, on September 5, 2002. It covers methods of applying power generators, including stand-alone generators and base loading. Key concepts such as KW and KVAR sharing, power factor, and voltage regulation are discussed, along with the importance of generator systems in providing backup power, reducing system loading, and stabilizing voltage.

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M E M S A

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  1. M E M S A Mining Electrical Maintenance and Safety Association CLEARWATER, FL September 5, 2002

  2. FULLY AUTOMATIC BACKUP GENERATOR SYSTEM Larry Casson Drummond Co. Inc.

  3. METHODS OF APPLYING POWER GENERATORS • STAND ALONE GENERATOR(S) • One or more generators provide all the real power (KW) and reactive power (KVAR) required by the load. Paralleling generators require KW and KVAR sharing. • BASE LOADING • One or more generators providing constant real output power (KW) and reactive power (KVAR). May be expressed as power (KW) and power factor (PF).

  4. GENERATOR # 1 GENERATOR # 2 34,500 VOLTS 4160 VOLTS OVERHEAD LINE # 1 OVERHEAD LINE # 2

  5. POWER IN KW UNLOADING TRAIN WITH DUAL CAR DUMPER AND POSITIONING CARS WITH A TRAIN CAR INDEXER

  6. MANUAL SWITCH TO GENERATORS MANUAL SWITCH TO INCOMING POWER

  7. BASICS

  8. POWER TRIANGLE KVA KVAR Included angle KW PF = COS of included angle = KW/KVA

  9. POWER TRIANGLE Base loading KVAR Voltage regulator KW Throttle

  10. 4 POWER QUADANTS + KVAR REVERSE POWER PROTECTION REQUIRED + KVAR Producing - KW + KW -KVAR Absorbing - KVAR

  11. UNDERGROUND14,400 VOLT SYSTEM ONE GENERATOR RUNNING KW KVAR

  12. WHY USE GENERATORS • BACKUP POWER SYSTEM • REDUCE POWER SYSTEM LOADING • HELP STABILIZE VOLTAGE

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