reventive Maintenance and checklist
HV END CONNECTOR
Preventive maintenance checklist
Why Perform Preventive Maintenance on Electrical Systems During the winter and summer months, power requirements are higher for many industries as facilities struggle to eep !uildings warm and their assets in operation" #n addition, in today$s economic en%ironment, facility and plant managers also struggle with efforts to lower power consumption in order to reduce e&penses" Reasons to Perform Electrical Preventive Maintenance THERE IS SAYING ‘A STITCH IN TIME SAES NINE!" electrical shorts that cause cause fires: Electrical Electrical short circuits can occur when wires wires are 1. Avoid electrical overloaded with current, wires are exposed and load imbalances. This can cause excessive heat build-up, arcin or explosions. !. "dentif# loose connections: $oose connections can cause power fluctuations to devices, devices to operate erraticall# and uneven load distribution between wires. %.
"dentif# components runnin hot or not accordin to specification specifications: s: Transformers, motors, bearins and wires almost alwa#s run hot before t he# fail. &redictive maintenance technoloies such as infrared Thermoraph#, vibration anal#sis and laser alinment tools as well as eneral maintenance such as reularl# scheduled lubrication can avoid asset failure.
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"dentif# unusual smells, noises, dust build up, or discoloration discoloration:: Meltin insulation, stressed motors, corrosion throuh dust and so on make a ph#sical inspection a re(uirement for electrical components. Electrical troubleshootin troubleshootin and simulation should be performed usin a s#stematic approach.
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*heck all emerenc# lihtin, sinae and power indicator displa#s: Man# electrical disasters occur when the safet# monitorin e(uipment itself is f ault# leadin to a false belief that all is ok.
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Extend the useful lifec#cle of assets: &oorl# maintained assets re(uire more ener# to do the same amount of work. This leads to excessive wear and tear and a shortenin of the assets useful lifec#cle.
. Avoid unplanned downtime: nplanned downtime can shut down production, result in
emerenc# labour costs and unnecessar# capital asset replacement. ithout proper electrical trainin, all of these sinificantl# impact the profitabilit# of t he orani/ation. 0.
#ess e$%i&ment loss: *onsistent electrical preventive maintenance will reduce the amount of e(uipment that needs to be replaced earl# as a result of electrical problems.
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Ener'y savin's: 2ptimal ener# efficienc# will occur when e(uipment is functionin within desin parameters and is well maintained.
13. Safety an( #ia)ility: The most important reason of all is safet#. Avoidin serious in4uries or
death is worth ever# penn# spent on prevention. $iabilit# law#ers have a field da# when facilities have a poor maintenance record.
Ho* +ften Sho%l( Electrical PM )e (one,
TR'N()OR*ER +V -(H#N.
Electrical s#stems should have a thorouh inspection b# a (ualified electrician. The fre(uenc# 5(uarterl#, half #earl#, annuall#, bi-#earl# so on. "t depends on the service of the e(uipments and decision should be taken b# section head. "ndividual assets should be inspected accordin to manufacturer directions or based upon experience and industrial trainin in a particular environment. 6or example, some motors ma# need to be inspected (uarterl#, air handlers annuall# and so on. &reventive maintenance, inspections and work orders are best handled usin #our own excel sheet or specialised software for the schedulin and recordin of activit#, results and notes. &reventive maintenance of electrical s#stems oes be#ond the visual or scheduled predictive maintenance work. A full electrical &M is a complete look at the electrical s#stem includin7
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Sample Electrical PM Items Compliance to safety audit recommendation
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Re/torque connections
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Checing panel !oards
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#nspecting control logic0scheme01+Cs for effecti%eness
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E&amining wor orders as well as new installs for compliance and uniformity
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*aing sure loc/out tags are in place
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#nspection of heating and cooling units
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+ighting
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(hutdown mechanisms
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NEC code compliance
Electrical ins&ection chec-lists an( reso%rces Ever# orani/ation has a uni(ue set of assets. Therefore, it is unlikel# that the same electrical inspection checklist will be the same. 8enerall# manufacturer provides the checklist for maintenance it should be adhere to or with own practice we can develop ourselves. GENERAL ANNUAL CHECKS
234 Re%iew past maintenance records to find repair patterns" These records may point to certain components that should !e closely inspected during performance of pre%enti%e maintenance" 254 Re%iew operator records concerning electrical load readings6 compare with equipment ratings" Operator records regarding operating temperatures and any documented a!normal circumstances associated with the system should also !e re%iewed" 274 #nspect (econdary Electrical Distri!ution Equipment8 2a4 #nspect to ensure that warning signs e&ist" Replace as required" 2!4 #nspect enclosures for damage, unauthori9ed openings, and corrosion of metallic o!:ects" Repair and paint as required" 2c4 #nspect air passages and remo%e any !locage" 2d4 #nspect, in%estigate, and sol%e conditions for unusual odors" 2e4 's equipment is operated and tested, listen, in%estigate, and sol%e conditions for unusual noises" 2f4 #nspect electrical connections for degradation and tightness" Repair as required" 2g4 #nspect electrical insulation for discoloration and degradation" Repair as required" 2h4 #nspect equipment grounding components such as conductors and connections" Repair as required" 2i4 #nspect insulators for damage" Replace as required" 2:4 #nspect liquid immersed equipment for leas and damage" 24 #nspect indicating lights for correct illumination" 2;4 Remo%e de!ris, dirt, and other foreign o!:ects from all components, housings, ca!inets, panels, etc" 2<4 Torque all electrical connections to design %alue"" 2=4 Verify operation of space heaters and control thermostat" Chec thermostat set point for proper setting" 2>4 Verify the grounding of the equipment and associated neutral where applica!le" 2?4 Conduct infrared test on all main current carrying equipment for hot spots that may indicate o%erload conditions or loose connections" 2@4 -sing cali!rated test instruments, cali!rate ammeters, %oltmeters, etc" Verify continuity
of metering selector switch contacts with ohmmeter" Sample Check List for Transformer Maintenance Date8 (u!station No8 Transformer No8
(ln o
Voltage Ratio8
'cti%ities
3
O!tain +C from (u!/station Operation
5
Chec for oil leaages
7
Chec for oil le%el in the conser%ator tan is up to 70;th mar
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Chec for reather condition
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Chec for (ilica .el condition
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Clean the !ody
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Open the terminal !o& chec the following a4 Tightness of terminal connection
!4 Condition of !ushings c4 'ny sign of o%erheating"
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Chec for any unplugged opening, missing !olts
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Chec all terminal !o& tightness
Checs carried
Remars
3A
Chec oil0winding temperature setting
33
Chec earthing system is proper B intact
35
Chec ca!le support
37
Chec #R %alue
3;
a4 1rimary
8 1/E
!4 (econdary
8 1/E
'ny other a!normality
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Check List for Sitch !oar" Maintenance
Date8 (u!station No8 ( No8
(ln o
Rating8
'cti%ities
3
O!tain +C from (u!/station Operation
5
Ensure isolation of the #ncomer and us coupler !reaer and control supply and Heater supply of the section
Checs carried
Remars
7
Ensure all !ac feeding sources are isolated
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Remo%e all !reaers0modules and 1T Cu!icles 2#f it is draw a!le type4
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Open the top and side co%ers of the !us!ar cham!er"
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Clean the !us!ar cham!er, !reaer rear and front compartment with air !lower, %acuum cleaner and dry cloth"
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Clean all insulators !y soft dry cloth B contact Cleaner" Chec for cracs, damages B replace the defecti%e one"
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Chec and tighten the e&posed :oints of the !us!ar" Chec for any signs of heating"
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Chec and tighten the power connections of CT0 1T and out going ca!les"
3A
Chec for any unplugged opening, missing !olts
33
o& up !us!ar cham!er B rear compartments of !reaer"
35
Chec earthing system is proper B intact
37
Chec #R %alue a4 R/E
3;
!4 /E
c4 /E
'ny other a!normality
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&osted b# 9haawan &rasad at 10:)! Email This9loThis;hare to Twitter;hare to 6acebook ;hare to &interest
) comments: 1. An(rei Morris1! 6ebruar# !31% at 10:) hen #our business depends on electrical machiner# and e(uipment for increased productivit# and improved cash flow, it is extremel# important to keep that machiner# inspected and well-maintained on a reular basis. &reventive electrical e(uipment maintenance done reularl# b# trained, professional and experienced electrical workers helps to detect electrical problems before the# become serious issues. 9# schedulin routine maintenance checks that utili/e advanced technolo# and expert electrical skills, the industrial e(uipment and machiner# on which #our business runs can continue workin efficientl#, reducin the risk of a catastrophic failure that can cost time and mone#. "
cameras can detect the radiation of heat that is emitted from an# iven ob4ect b# takin @heat@ imaes. Throuh a rane of colors, these imaes present hot spots that cannot otherwise be perceived b# the naked e#e. "< thermoraph# is used to reveal loose circuits, e(uipment failure and safet# ha/ards. Electrical workers can then use the thermoraphic imaes to anal#/e and measure temperatures, identif#in problems and fixin them before the# become severe.
