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- ' ' • �'� ��� ��� <br /> Circuit Breakers-Low Voitage <br /> Mechanicai Insqection <br /> • Inspect physical and mechanical condition. <br /> • Check breaker for smooth operation by closing and tripping several times. <br /> • Check connections for tightness. <br /> • Clean and inspect breaker for cracked or broken springs or retainers. If draw out type, <br /> inspect primary and secondary finger clusters for overheating and broken parts. <br /> Electrical Testinp <br /> • Check contact resistance with a low resistance ohmmeter. <br /> • Check breaker insulation resistance with a D.C. Meg ohmmeter as fiollows: <br /> ✓ Phase to Phase- breaker closed. <br /> ✓ Phase to Ground - breaker closed. <br /> Air Circuit Breakers-Medium Voltage <br /> Mechanical Insqection <br /> • Inspect physical and mechanical condition. <br /> • Inspect anchorage, alignment and grounding. Inspect arc chutes. Inspect moving and <br /> stationary contacts for condition, wear and alignment. <br /> • Verify that primary and secondary contact wipe and other dimensions vital to satisfactory <br /> operation of the breaker are correct. <br /> Perform all mechanical operator and contact alignment tests on both the breaker and its <br /> operating mechanism. <br /> • Verify cell fit and element alignment. <br /> • Verify racking mechanism. <br /> • Inspect puffer operation. <br /> • Lubrication: <br /> ✓ Verify appropriate contact lubricant on moving current-carrying parts. <br /> ✓ Verify appropriate lubrication on moving and sliding surfaces. <br /> • Record as-found and as-left operation-counter readings. <br /> Electrical Testin� <br /> • Perform a contact-resistance test. <br /> • Perform an insulation-resistance test at 1000 volts dc from pole-to pole and from each <br /> pole-to-ground with breaker closed and across open contacts of each phase. <br /> • Pertorm resistance measurements through all bolted connections with a low-resistance <br /> ohmmeter, if applicable. <br /> • PerForm insulation-resistance test at 500 volts dc on all control wiring. For units with <br /> solid-state components, follow manufacturer's recommendations. <br /> • With breaker in the test position, make the following tests: <br /> ✓ Trip and close breaker with the control switch. <br /> ✓ Trip breaker by operating each of its protective relays. <br /> ✓ Verify trip-free and anti-pump function. <br /> Siemens Energy 8� Automation, Inc. <br /> Process Solutions Division 2220 W Altorter Dr. Tel: (309)696-D535 www.sea.siemens.com/engineer <br /> Industrial Services Business Unit Peoria,IL 61615 Fax:(678)297-8535 <br />