report siap explain switchgear and switchgear maintenance

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  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    In an electric power system,switchgear is the combination of electrical disconnect

    switches, fuses or circuit breakers used to control, protect and isolate electrical equipment.

    Switchgear is used both to de-energize equipment to allow work to be done and to

    clear faults downstream. This type of equipment is important because it is directly linked tothe reliability of the electricity supply.

    One of the basic functions of switchgear is protection, which is interruption of short-circuit

    and overload fault currents while maintaining service to unaffected circuits. Switchgear also

    provides isolation of circuits from power supplies. Switchgear is also used to enhance system

    availability by allowing more than one source to feed a load.


    A section of a large switchgear panel, in this case, used to control on-board casino boat power generation.

  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


    You can prevent switchgear failure with proper maintenance.When switchgear malfunctions, the consequences are often catastrophic. Damage to the

    switchgear itself can be extremely expensive, but that pales in comparison to corollarydamage and the potential hazards to people. Thus, implementing an effective switchgeartesting, inspection, and maintenance program is essential. Even switchgear labeledmaintenance free requires periodic testing and maintenance.Develop a maintenance program. The many approaches to switchgear maintenancerange from continuous online monitoring to do nothing (also called run-to-failure).Predictive and preventive maintenance programsincluding most of the National FireProtection Association (NFPA) and InterNational Electrical Testing Association (NETA)recommendationsfall in the middle of this range. Most real-world maintenance programsare a combination of these approaches. For instance, replacing indication lights only whentheyve failed is an example of run-to-failure maintenance. On the other hand, maintainingdisconnect switches on a periodic basiscleaning, lubricating, and exercising themis anexample of preventive maintenance. Annual visual and thermographic inspections on busconnections and breakers are examples of predictive maintenance.Developed by the airline industry and later adopted by other industries, reliability centeredmaintenance (RCM) is another approach. RCM is a systematic and comprehensive methodappropriate where equipment reliability is critical. It involves analyzing system criticality andcomponent failure modes, evaluating those failure modes and the appropriate maintenanceactivities for each component and then determining what is the most appropriate andeffective preventive maintenance activity for each component. RCM programs improveelectrical system reliability, and experts credit RCM programs with improving safety andmanagement of spare parts, decreasing repair costs, shortening outages, and reducingoverhaul frequency.

    Manufacturer maintenance recommendations may or may not suggest maintenancefrequency. The 2001 NETA standard provides a maintenance frequency matrix that givesrecommendations based on the level of reliability required and the condition of theequipment.

  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


    The NFPA standard also includes suggested maintenance frequencies. They vary (typicallyfrom three months to six years) depending on system criticality and the environment in

    which the equipment is located. Because no manufacturer or standards-making body canpresume to know how these conditions differ in your installation, its impossible for them tocome up with a meaningful maintenance frequency. On one hand, you want to minimize thenumber of maintenance outages; on the other, you dont want a switchgear failure to occur.Part of maintaining switchgear is ensuring your protective devices operate in the rightsequence. But how often must you verify that the settings and sizes are correct? Any timeyou have a change on the utility system or to your own system, you must confirm the shortcircuit withstand and interrupting ratings of your equipment are still adequate. A short-circuit study determines the magnitudes of available short-circuit current at each of yourswitchgear locations. A proper study will identify any switchgear that available short-circuitcurrent would overstress.Have your breakers tripped or fuses blown without a fault occurrence? Did the wrong deviceoperate when a fault occur? A coordination study provides device settings so breakers andfuses in your facility can coordinate and operate selectively. That is, a fault near the end ofyour circuit will cause the nearest upstream breaker or fuse to operatenot your mainbreaker. If you dont know whether your system coordination is correct, do a coordinationstudy long before the next maintenance outage.

  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


    Plan for the maintenance outage.

    The following steps will help you formulate a comprehensive maintenance action plan and inturn an effective switchgear maintenance program. Prior to the outage:

    Review your equipment history. What failures have occurred? Are you aware of any repair or

    refurbishment needs? Review the drawings and other documentation. Are the relevant drawings current? Do you

    have the correct instruction manuals? Perform visual inspections, thermal scanning, partial discharge testing, and other testing

    before the outage so you can take corrective action when it happens. Identify and order all materials required for the outage. Take lead times into account. Develop a specific work plan and schedule. Communicate this information to all involved

    personnel, and keep your end-users updated on the big picture. Conduct the tailgate safety meeting to be sure each person understands any dangers,

    special circumstances, and related work assignments. During the outage: Shutdown the switchgear and apply protective grounds. Follow lockout/tagout procedure.

    Barricade and put up warning signs as appropriate. Check and correct any drawing inconsistencies or connection questions. Perform inspections and cleanings. Disconnect as necessary for tests. Make any planned repairs, changes, or upgrades. Perform measurements and tests. Based on test results, make additional repairs. Concluding the outage: Re-connect and torque connections. Account for all tools and personnel. Make a visual check of all work. Remove grounds and then test to ensure you have no unintentional grounds. Energize switchgear and verify normal operation. Remove barricades and signs, and follow appropriate procedures to clear the lockout/tagout

    condition. After the outage: Interview crews about problems they may have encountered. Ask them for

    recommendations for improving response efforts during the next outage or preventingproblems that occurred in this one.

    Prepare a report of maintenance outage and test results. Include trending and analysis ofresults and recommendations for future maintenance as appropriate.

    Making maintenance happen.

    Switchgear maintenance is usually considered a low priority by most management teams,who defer or ignore it until a failure occurs. At many facilities, the maintenance crews takeonly some of the easier steps. However, experience shows this is an economic dance withthe devil. When you fail to conduct the proper maintenance, the risk of loss is high. But asolid maintenance program is much less costly than the impact of switchgear failure, whichcan include injury or death, lost product and production, as well as clean-up and switchgearreplacement costs. When you give maintenance the thought and effort it deserves, youimprove safety, reliability, uptime, and profitability.

  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    A piece of switchgear may be a simple open-air isolator switch or it may be insulated by some other

    substance. An effective although more costly form of switchgear is gas insulated switchgear(GIS),

    where the conductors and contacts are insulated by pressurized sulfur hexafluoridegas(SF6). Other

    common types are oil or vacuum insulated switchgear.

    The combination of equipment within the switchgear enclosure allows them to interrupt fault currents

    of thousands of amps. Acircuit breaker(within a switchgear enclosure) is the primary component that

    interrupts fault currents. The quenching of the arc when the circuit breaker pulls apart the contacts

    open (disconnects the circuit) requires careful design. Circuit breakers fall into these five types:


    Oil circuit breakers rely upon vaporization of some of the oil to blast a jet of oil through the arc. The

    vapor released by the arcing consists hydrogen gas. This gas is very effective at cooling the arc so

    that dielectric properties are restored at current zero.
  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    Air circuit breakers may use compressed air (puff) or the magnetic force of the arc itself to elongate

    the arc. As the length of the sustainable arc is dependent on the available voltage, the elongated arc

    will eventually exhaust itself. Alternatively, the contacts are rapidly swung into a small sealed

    chamber, the escaping of the displaced air thus blowing out the arc.

    Circuit breakers are usually able to terminate all current flow very quickly: typically between 30 ms

    and 150 ms depending upon the age and construction of the device.


    Sulfur hexafluoride circuit breaker

    Gas (SF6) circuit breakers sometimes stretch the arc using a magnetic field, and then rely upon the

    dielectric strength of the SF6 to quench the stretched arc.

  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    A hybrid switchgear is one that combines the components of traditional air-insulated switchgear (AIS)

    and SF6 gas-insulated switchgear (GIS) technologies. It is characterized by a compact and modular

    design, which encompasses several different functions in one module.


    Circuit breakers with vacuum interrupters have minimal arcing characteristics(as there is nothing to

    ionize other than the contact material), so the arc quenches when it is stretched by a small amount


  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


    Carbon dioxide (CO2)

    Breakers that use carbon dioxide as the insulating and arc extinguishing medium work on the same

    principles as an SF6 breaker. By switching from SF6 to CO2 it is possible to reduce the CO2 emissions

    by 10 tons during the product life cycle.

  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    Low Voltage Switchgear refers to switchgear which is rated for a voltage of 600V and

    below. Low voltage switchgear includes switches, fuse gear, enclosures, connection devices

    and cable distribution cabinets.

    The function of any switchgear is Electrical protection, electric isolation and local and remote


    The switchgear typically consists of a section in the front consisting of the circuit breakers,

    meters, protective relays. Behind the front section, is the bus section consisting of the

    busbar and behind it is the cable entry section where the cables are routed.

    Low voltage switchgear can be broadly classified into two types, outdoor types and indoor


    Outdoor type switchgear differs from indoor type switchgear due to the presence of a

    weather-proofing enclosure. Bus bars are usually made of copper or aluminium.

    Modern low voltage switchgear products consist of integrated modules consisting

    of switchgear, metering and protective features. These integrated modules are driven

    by microprocessors.

    This article is the first in a series of articles focusing on Low Voltage Switchgear
  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    A single-phase electric power supply is the distribution of alternating current electric power

    where all the voltages of the supply vary in unison. Single-phase distribution is used when

    loads are mostly lighting and heating, with few large electric motors. A single-phase power

    supply has two hot legs or conductors, which have a sine wave that are 180 degrees apart.

    In electrical engineering, single-phase electric power refers to the distribution

    ofalternating current electric power using a system in which all the voltages of the supply

    vary in unison. Single-phase distribution is used when loads are mostly lighting and heating,

    with few large electric motors. A single-phase supply connected to an alternating

    current electric motor does not produce a revolving magnetic field; single-phase motors

    need additional circuits for starting, and such motors are uncommon above 10 or 20 kW in


    In contrast, in a three-phase system, the currents in each conductor reach their peak

    instantaneous values sequentially, not simultaneously; in each cycle of the power frequency,first one, then the second, then the third current reaches its maximum value. The

    waveforms of the three supply conductors are offset from one another in time (delayed

    in phase) by one-third of their period. When the three phases are connected to windings

    around the interior of a motor stator, they produce a revolving magnetic field; such motors

    are self-starting.

    Standard frequencies of single-phase power systems are either 50 or 60 Hz. Special single-

    phase traction power networks may operate at 16.67 Hz or other frequencies to power

    electric railways.

    In some countries such as the United States, single phase is commonly divided in half to

    create split-phase electric power for household appliances and lighting.
  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    Three-phase electric power is a common method ofalternating-current electric

    power generation, transmission, and distribution.[1]

    It is a type ofpolyphase system and is the most

    common method used by electrical grids worldwide to transfer power. It is also used to power

    large motors and other heavy loads. Athree-phase system is usually more economical than an

    equivalent single-phase or two-phasesystem at the same voltage because it uses less conductor

    material to transmit electrical power.[2]

    The three-phase system was independently invented

    by Galileo Ferraris, Mikhail Dolivo-Dobrovolskyand Nikola Tesla in the late 1880sIn a three-phase system, three circuit conductors carry threealternating currents(of the same

    frequency) which reach their instantaneous peak values at one third of a cycle from each other.

    Taking one current as the reference, the other two currents are delayed in time by one third and two

    thirds of one cycle of the electric current. This delay between phases has the effect of giving constant

    power transfer over each cycle of the current and also makes it possible to produce a rotating

    magnetic field in anelectric motor.

    Three-phase systems may have aneutralwire. A neutral wire allows the three-phase system to use a

    higher voltage while still supporting lower-voltagesingle-phaseloads. In high-voltage distribution

    situations, it is common not to have a neutral wire as the loads can simply be connected betweenphases (phase-phase connection).

    Three-phase has properties that make it very desirable in electric power systems:

    The phase currents tend to cancel out one another, summing to zero in the case of a linear

    balanced load. This makes it possible to reduce the size of the neutral conductor; all the phase

    conductors carry the same current and so can be the same size, for a balanced load.

    Power transfer into a linear balanced load is constant, which helps to reduce generator and motor


    Three-phase systems can produce a magnetic field that rotates in a specified direction, which

    simplifies the design of electric motors.
  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    We all familiar with low voltage switches and re-wirable fuses in our home.The switch is used to manually open and close the electrical circuit in ourhome andelectrical fuseis used to protect our household electrical circuit fromover current and short circuit faults. In same way every electrical circuitincluding high voltageelectrical power systemneeds switching and protectivedevices. But in high voltage and extra high voltage system, these switchingand protective scheme becomes complicated one for high fault currentinterruption in safe and secure way. In addition to that from commercial pointof view everyelectrical power systemneeds measuring, control and regulatingarrangement. Collectively the whole system is called Switchgear andProtection of power system. The electrical switchgear have beendeveloping in various forms.

    Switchgear protection plays a vital role in modern power system network,right from generation through transmission to distribution end. The currentinterruption device or switching device is called circuit breaker in Switchgearprotection system. The circuit breaker can be operated manually as whenrequired and it is also operated during over current and short circuit or anyother faults in the system by sensing the abnormality of system. The circuitbreaker senses the faulty condition of system through protection relay and thisrelay is again actuated by faulty signal normally comes from currenttransformerorvoltage transformer.

    A switchgear has to perform the function of carrying, making and breaking the

    normal load current like a switch and it has to perform the function of clearingthe fault in addition to that it also has provision of metering and regulating thevarious parameters of electrical power system. Thus the circuit breakerincludes circuit breaker, current transformer, voltage transformer, protectionrelay, measuring instrument, electrical switch,electrical fuse,miniature circuitbreaker, lightening arrestor or surge arrestor, isolator and other associatedequipment.

    Electric switchgear is necessary at every switching point in theelectrical powersystem. There are various voltage levels and hence various fault levelsbetween the generating stations and load centers. Therefore various types of

    switchgear assembly are required depending upon different voltage levels ofthe system.
  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    The main switchboard, as the primary distribution center, distributes 450 volts, 3 phase,

    60 cycle power. The 450 volt power is distributed to power panels throughout the ship and

    also to the emergency switchboard. Transformers at the lighting load centers step down the

    450 volts to 120 volts. The lighting load centers distribute 120 volt power. There are three

    lighting load centers. Ships service lighting load centers no. 1 and no. 2 are normally fed

    from bus section no. 3.

    The main switchboard is composed of three parts consisting of distribution panels at the

    right, three generator panels in the center, and distribution panels at the left (facing the

    front of the switchboard). Right side distribution and generator no.1 are connected to bus

    section 1, emergency switchboard feeder, machinery space lighting and generator no. 2 are

    connected to bus section 2. Left side distribution and generator no. 3 are connected to bus

    section 3. The three bus sections are normally connected together by removable disconnect


  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance



    In electricity supply,overcurrent or excess current is a situation where a larger than

    intended electric current exists through a conductor, leading to excessive generation of heat, and the

    risk of fire or damage to equipment. Possible causes for overcurrent includeshort circuits, excessive

    load, and incorrect design. Fuses, circuit breakers, temperature sensors and current limiters arecommonly used protection mechanisms to control the risks of overcurrent

    Equipment to be used for testing the protection system

    Mobile Workstation, Protective Relay Control Station, Transmission Grid A, Interconnection

    Module, Universal Fault Module, Power Supply, Faultable Transformer, Resistive Loads,

    Current Transformers, AC Ammeter, AC Voltmeter, Three-phase Overcurrent Relay, AC/DC

    Current Sensitive Relay, and Connection Leads.

    Testing procedure and observations

    Ensure that the Protective Relay Control Station is connected to a three-phase power

    source. Make sure that the DC Power Supply to the Protective Relay Control Station is

    turned off. Also, make sure that all fault switches on the Three-phase overcurrent relay and

    AC/DC current sensitive relay are set to O (off) position.

    2. Make the following settings on the Universal Fault Module:

    TD1 time delay 1 s

    SST1 time interval 3 s

    SST2 time interval 10 s

    (Note: These settings have already been done by the Lab technician)

    3. Make sure that the Transmission Grid A, Interconnection Module, Universal FaultModule, Power Supply, Faultable Transformer, Resistive Loads (2), CurrentTransformers, AC Ammeter, and AC Voltmeter are installed in the EMS Workstation. Seethat the Power Supply is turned off and its voltage control knob is set to the O position.

    4. On the Current Transformer module, make sure that all the switches are set to the I

    (close) position to short-circuit the secondaries of the current transformers.5. Connect the equipment as shown in Figs. 2 and 3.6. Make the following settings:

    On the Faultable Transformers

    Transformer T1 Fault switches (FS1 to FS3) - - - - - O

    Transformer T3 Fault switches (FS1 to FS3) - - - - - O

    On Transmission Grid A

    Switch S1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - O
  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


    Fig. 2 Connection diagram of the equipment in EMS Workstation

    Fig. 3 Connection diagram of the equipment in the Protective Relay Control Station

  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


    On the AC/DC Current Sensitive Relay

    INPUT switch - - - - - - - - - - - - - - - - - - - - - - - - - AC

    MODE switch - - - - - - - - - - - - - - - OVER CURRENT

    On the Universal Fault Module

    INITIATE FAULT button - - - - - - - - released position

    FAULT DURATION switch- - - - - - - - - - - 0.3 30 s

    On the Current Transformer Module

    Current transformers CT1, CT2 and CT3 - - - O (open)

    7. Set the current set point of the Three-Phase Overcurrent Relay to approximately 200%of the nominal full-load current of the power transformers, taking into account thetransformation ratio of the current transformers.

    8. Set the time delay of the Three-Phase Overcurrent Relay to approximately 5 s. Adjustthe set point and hysteresis of the AC/DC Current Sensitive Relay to 100mA and 5%,respectively.

    9. Turn on the DC Power Supply of the Protective Relay Control Station.

    10.On Transmission Grid A, set switch S2 to O (open) position to open the contactor CR2.This will prevent operation of the protection system and allow the operation of theprotective relays to be observed.

    11.Turn on the Power Supply and set the voltage control knob to the 100% position. Setthe primary line current (indicated by ammeter I1) should be approximately equal tothe full-load current of the power transformers by adjusting the resistive loads.

    12.On the Universal Fault Module, depress the INITIATE FAULT button to short-circuit onephase of the three-phase load. While doing this, observe the circuit currents andvoltages as well as tripping indicator (red LED) on the Three-Phase Overcurrent Relayand AC/DC Current Sensitive Relay. Record the current and voltages in the blankspaces.

    (Note: You may have to initiate this fault a few times to record the circuit currents

    and voltages)

    I1 = . A I2 = A I3 = A

    E1 = V E2 =

  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


    Testing Procedure for Earth Fault Relay (EFR)

    1. Record all particulars of relay to be tested and its working settings.

    2. Check the auxiliary supply voltage connected to the relay corresponds to the ratedauxiliary voltage stated on its name plate.

    3. Connect output of the test set to input terminals of the ELR. Alternatively single-

    phase primary current can be injected into one of the conductors to induce a

    secondary current on the ZCT

    4. Ensure that knob on test set has return to zero position. Then switch on test set.

    5. Increase the output current on the test set gradually until relay picks up. Record the

    current in test form.

    6. Connect a trip contact to timer stop terminals of the test set.

    7. Switch on the test set, increase current to 2 times of setting current. Switch off the

    test set with control knob remaining in the same position.

  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


    8. Switch on the test set to inject current and start timer at the same time. After trip

    contact has operated, record relay operating time in test form. Switch off the test


    9. Disconnect all wirings between test set and relay. Check that connection to relay is



    Preventive maintenance (PM) has the following meanings:

    1. The care and servicing by personnel for the purpose of maintaining equipment and facilities

    in satisfactory operating condition by providing for systematic inspection,detection, and

    correction of incipient failures either before they occur or before they develop into major

    defects.2. Maintenance, including tests, measurements, adjustments, and parts replacement, performed

    specifically to prevent faults from occurring.

    The primary goal of maintenance is to avoid or mitigate the consequences of failure of equipment.

    This may be by preventing the failure before it actually occurs which Planned Maintenance and

    Condition Based Maintenance help to achieve. It is designed to preserve and restore equipment

    reliability by replacing worn components before they actually fail. Preventive maintenance activities

    include partial or complete overhauls at specified periods, oil changes, lubrication and so on. In

    addition, workers can record equipment deterioration so they know to replace or repair worn parts

    before they cause system failure. The ideal preventive maintenance program would prevent all

    equipment failure before it occurs.

    Preventive maintenance can be described as maintenance of equipment or systems before fault

    occurs. It can be divided into two subgroups:

    planned maintenanceand

    condition-based maintenance.

    The main difference of subgroups is determination of maintenancetime, or determination of moment

    when maintenance should be performed.

    While preventive maintenance is generally considered to be worthwhile, there are risks such as

    equipment failure orhuman errorinvolved when performing preventive maintenance, just as in anymaintenance operation. Preventive maintenance as scheduled overhaul or scheduled replacement

    provides two of the three proactive failure management policies available to the maintenance

    engineer. Common methods of determining what Preventive (or other) failure management policies

    should be applied are;OEMrecommendations, requirements of codes and legislation within a

    jurisdiction, what an "expert" thinks ought to be done, or the maintenance that's already done to

    similar equipment, and most important measured values and performance indications.

    In a nutshell:

    Preventive maintenance is conducted to keep equipment working and/or extend the life of the


    Corrective maintenance, sometimes called "repair," is conducted to get equipment working again.,_repair_and_operations,_repair_and_operations,_repair_and_operations
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  • 7/30/2019 Report Siap Explain Switchgear and Switchgear Maintenance


    Inspection Checklist Field Maintenance ReportIdent-Nr.:


    Location / Operator:


    Date________ Time in ________ Out __________Field Technician(s) _____________________________________

    Inspection call 6 / 12 / 18 / 24 / 36 months Regular service Repair of deficienciesRegular Service Sample


    Plant status

    Counter Hours of operation _____________________ [h] Water: _____________________ [gaqPermeate _____________________ [gal]

    Accessibility Yes NO System operates Yes NO

    Cover free from defects Yes NO System recovers Yes NO

    Check Air blower fully functional defect solenoid valve fully functionaldefect

    Submerged pump fully functional defect pumping system fully functionaldefect

    Level switch fully functional defect pressure increasing fullyfunctional defect

    Air-lift pump fully functional defect

    Septic / first bufferSoloids sanitary napkins Fat I WaxOther:________________

    Odor aerobic septic/fecalsoapily acid

    MBR Texture (optically) thin (MLSS

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    Functional check pumps & piping aeration

    solenoid valvesPermeation Alarm panel

    Active carbon filter Check change of cleaning





    ___________________________ ________________________BUSSE Innovative System GmbH Customer/Operator

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    This Equipment Schedule is provided as an example only. Refer to Section 26 29 90B and

    Section Cover Sheet for details.

    Equipment Make Model Quantity

    Power Transformer, Dry Type

    Switchgear Enclosure

    Low Voltage Air Circuit Breakers

    Fused LB Disconnect Switchgear

    Unfused LB Disconnect Switchgear

    Fused NLB Disconnect Switchgear

    Unfused NLB Disconnect Switchgear

    Induction Disc Relays

    Overcurrent Relays

    Solid State Relays

    Overhead Power Line Insulators

    Overhead Power Line Connectors

    Overhead Power Line Wooden Poles

    Overhead Power Line Metal Tower Structure

    Surge Arrestors

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    RECOMMENDED MAINTENANCE SCHEDULEThe Bandsaw is not a high maintenance machine, and it is strongly suggested thata programmed maintenance schedule is developed for this equipment and that timeis allocated specifically for maintenance purposes.

    The table below is offered as a guideline.

    To add another entry to the table, place your cursor in the bottom last column celland go to Table > Insert > Rows below or above the placed cursor cell.

    Machine ID: eg. B.S. wood/metalRoom ID:

    Maintenance Operation Daily Weekly

    Check Switch gear and examine for observable defects. *

    Check Electrical wiring for visual damage. *

    Check push sticks and similar are available and in goodrepair.


    Check guards for security and correct operation. *

    Check availability and condition of personal protectiveequipment.


    Check condition of workspace/walk ways and ensureworkspace is clearly defined.


    Check blade guides for correct operation. *

    Examine blade for cracks, deformities and broken teeth. *

    Check inventory of spare parts to ensure spare blades etc.are available.


    Lubricate Machine according to manufacturers specifications.Daily or before


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