Schneider Electric Services: life-cycle solutions for electrical distribution equipment. Scopes of Work for Electrical Maintenance

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1 Scopes of Work for Electrical Maintenance Schneider Electric Services: life-cycle solutions for electrical distribution equipment Make the most of your energy SM

2 Scopes of Work for Electrical Maintenance: TABLE OF CONTENTS Bulletin No. 1910DB1303 TABLE OF CONTENTS SECTION 1 INTRODUCTION...4 SECTION 2 GENERAL REQUIREMENTS...5 SECTION 3 AC DRIVES...6 SECTION 4 AIR SWITCHES: LOW VOLTAGE...7 SECTION 5 AIR SWITCHES: MEDIUM VOLTAGE, METAL-ENCLOSED...9 SECTION 6 AIR SWITCHES: HIGH AND MEDIUM VOLTAGE, OPEN STYLE...11 SECTION 7 SWITCHES: HVL/cc...12 SECTION 8 METERING DEVICES...14 SECTION 9 BUSWAYS, METAL- ENCLOSED...15 SECTION 10 OUTDOOR / SUBSTATION BUS...16 SECTION 11 CABLES: LOW VOLTAGE...17 SECTION 12 CABLES: MEDIUM VOLTAGE...18 SECTION 13 CAPACITORS: POWER FACTOR CORRECTION...19 SECTION 14 CIRCUIT BREAKERS: LOW VOLTAGE INSULATED CASE/ MOLDED CASE...20 SECTION 15 CIRCUIT BREAKERS: LOW VOLTAGE POWER (ANSI/IEEE C37.13)...22 SECTION 16 CIRCUIT BREAKERS: MEDIUM VOLTAGE AIR MAGNETIC...24 SECTION 17 CIRCUIT BREAKERS: MEDIUM VOLTAGE SF SECTION 18 CIRCUIT BREAKERS: MEDIUM VOLTAGE VACUUM...28 SECTION 19 CIRCUIT BREAKERS: MEDIUM VOLTAGE OIL...30 SECTION 20 DIRECT CURRENT SYSTEMS: BATTERIES AND CHARGERS...32 SECTION 21 EMERGENCY SYSTEMS: AUTOMATIC TRANSFER SWITCHES...33 SECTION 22 GROUND-FAULT PROTECTION SYSTEMS...35 SECTION 23 GROUNDING RESISTORS...37 SECTION 24 GROUNDING SYSTEMS...38 SECTION 25 ISOLATED POWER SYSTEMS...39 SECTION 26 MOTOR CONTROL CENTERS: LOW AND MEDIUM VOLTAGE...41 SECTION 27 MOTOR STARTERS: LOW VOLTAGE...44 SECTION 28 MOTOR STARTERS: MEDIUM VOLTAGE...45 SECTION 29 PROTECTIVE RELAYS...47 SECTION 30 STEP VOLTAGE REGULATORS...48 SECTION 31 SURGE ARRESTERS: LOW VOLTAGE SURGE PROTECTION DEVICES...50 SECTION 32 SURGE ARRESTERS: MEDIUM AND HIGH VOLTAGE SURGE PROTECTION DEVICES...51 SECTION 33 SWITCHGEAR AND SWITCHBOARD ASSEMBLIES: LOW AND MEDIUM VOLTAGE...52 SECTION 34 SWITCHGEAR DVCAS SECTION 35 TRANSFORMERS: DRY TYPE: ALL VOLTAGES - LARGE (GREATER THAN 167 SINGLE-PHASE AND 500KVA THREE-PHASE)...56 SECTION 36 TRANSFORMERS: DRY TYPE - SMALL (167KVA SINGLE-PHASE, 500KVA THREE-PHASE, AND SMALLER)

3 Scopes of Work for Electrical Maintenance: TABLE OF CONTENTS TABLE OF CONTENTS SECTION 37 TRANSFORMERS, INSTRUMENT...58 SECTION 38 TRANSFORMERS: LIQUID-FILLED: ALL VOLTAGES...60 SECTION 39 INFRARED SCANNING...62 LIST OF TABLES TABLE: Insulation Resistance Test Value Electrical Apparatus and Systems...63 TABLE: Switchgear Withstand Test Voltages...64 TABLE: Recommended Dissipation Factor/Power Factor at 20 C Liquid-Filled Transformers, Regulators, and Reactors Acceptance Test Values...65 TABLE: Insulating Fluid Limits...66 TABLE: Transformer Insulation Resistance Acceptance Testing...69 TABLE: Medium-Voltage Cables Acceptance Test Values...70 TABLE: Inverse Time Trip Test at 300% of Rated Continuous Current of Circuit Breaker Molded-Case Circuit Breakers...73 TABLE: Instantaneous Trip Tolerances for Field Testing of Circuit Breakers...74 TABLE: Instrument Transformer Dielectric Tests Field Acceptance...75 TABLE: Maximum Allowable Vibration Amplitude...76 TABLE: RESERVED...77 TABLE: Bolt-Torque Values for Electrical Connections...78 TABLE: SF6 Gas Tests...80 TABLE: Insulation Resistance Conversion Factors (20 C)...81 TABLE: High-Potential Test Voltage Automatic Circuit Reclosers...83 TABLE: High-Potential Test Voltage for Acceptance Testing of Line Sectionalizers...84 TABLE: Dielectric Withstand Test Voltages Metal-Enclosed Bus...85 TABLE: Thermographic Survey Suggested Actions Based on Temperature Rise...86 TABLE: Dielectric Withstand Test Voltages Electrical Apparatus Other than Inductive Equipment...87 TABLE: Rated Control Voltages and their Ranges for Circuit Breakers...88 TABLE: Accuracy of IEC Class TP Current Transformers Error Limit...91 TABLE: Minimum Radii for Power Cable Single & Multiple Conductor Cables with Interlocked Armor, Smooth or Corrugated Aluminum Sheath or Lead Sheath...92 TABLE: Recommended Torque Values for Field Installed Wiring, Bus and Cable Connections...94 TABLE: Maximum Micro-Ohms Per Pole...96 TABLE: Maximum Micro-Ohms Per Pole...97 TABLE: Maximum Micro-Ohms Per Pole...97 TABLE: Type DS, DSII, DSL, and DSLII Circuit Breaker

4 Scopes of Work for Electrical Maintenance: SECTION 1 INTRODUCTION Bulletin No. 1910DB1303 SECTION 1 INTRODUCTION The Scopes of Work (SOWs) described in this bulletin are recommended practices that are ordinarily used in the field to determine the condition of an electrical power system. These practices can form the basis for a comprehensive Electrical Preventative Maintenance (EPM) program, however, they are not intended to be a mandatory practice or applicable and all inclusive for each type of equipment found in modern electrical power distribution systems. The practices in this document describe What to Do and not How To Do It. These practices should only be performed by persons that are qualified by experience and training in the proper and safe execution of EPM. In lieu of a customer specification or other written guidelines, this bulletin details the inspection and testing procedures that Schneider Electric Services technicians follow while performing maintenance testing of electrical equipment. Our qualified field service representatives provide comprehensive maintenance and testing services with a scope of work that includes: Equipment inspection Protective device testing Cleaning and lubrication Adjustments Electrical testing, including insulation, current path, system function and other services. Acknowledgement The standard deliverables to the customer are those services described in the each section of these procedures and titled Visual and Mechanical Inspection and Electrical Tests. Optional Tests will only be performed by Schneider Electric technicians when specified on customer s purchase order and subsequent field service work order. For testing of equipment not detailed in this document, Schneider Electric Services will refer to manufacturer s instructions, NFPA 70B, IEEE, ANSI and other relevant standards. For additional information, contact Schneider Electric Services at This document has been prepared based on manufacturer instruction bulletins as well as, NFPA, IEEE, NEMA and ANSI standards Tables are based on information from Schneider Electric USA, Inc. and the ANSI/NETA Standard for Maintenance Testing Specifications for Electrical Power Equipment and Systems 4

5 Scopes of Work for Electrical Maintenance: SECTION 2 GENERAL REQUIREMENTS SECTION 2 GENERAL REQUIREMENTS! DANGER HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E or CSA Z462. This equipment must be installed and serviced by qualified electrical personnel. Turn off all power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Replace all devices, doors and covers before turning on power to this equipment. Failure to follow these instructions will result in death or serious injury. Schneider Electric Services (SES) considers the safety of our employees, customers and all persons associated or affected by our work to be our highest priority. All work performed by Schneider Electric will adhere to Schneider Electric Safe Work practices, NFPA 70E, Customer Requirements and State and Federal standards. In all cases the most stringent procedures will be adhered to. At any point if the lead Schneider Electric representative determines work cannot proceed safely in accordance with these requirements work will be halted until a mutually agreeable resolution is reached. Owner / Customer shall supply current and accurate one-line and as built drawings for review prior to commencement of work. These will be given to Schneider Electric Personnel for use throughout the testing project. Owner / Customer shall supply OEM (Original Equipment Manufacture) Operations and Maintenance Manuals for all equipment to be tested. Copies of these should be given to Schneider Electric Personnel for use throughout the testing project. Schneider Electric Services Employees are NOT AUTHORIZED to work on energized equipment. However, there are occasions in which it may be necessary to take voltage measurements within an energized enclosure. These measurements will be taken using all applicable procedures for energized work. Schneider Electric Services does not typically perform shutdown and/or switching operations, because these operations may result in damage to property or persons downstream of the equipment as a result of conduct, errors, or omissions made by others. If a customer requests Schneider Electric Company to perform such services, a copy of the Schneider Electric Shutdown/Switching policy must be reviewed and signed by the customer. The onsite technician(s) must also contact their Manager for approval and proper procedures prior to performing any shutdown and/or switching. Schneider Electric maintains an equipment calibration program to assure that the equipment used to monitor and measure data associated with key characteristics will provide data that is both accurate and repeatable. The calibration cycle is defined by manufacturer and industry guidelines. Equipment included in the program is identified by a calibration sticker or tag affixed to each piece of test equipment. Equipment calibration records are available for review based on project specifications. Should hazardous materials such as asbestos, PCB contaminated oils or other similar substances be encountered work will be suspended until a mutually agreeable plan can be implemented to safely handle the material. 5

6 Scopes of Work for Electrical Maintenance: SECTION 3 AC DRIVES Bulletin No. 1910DB1303 SECTION 3 AC DRIVES A. Visual and Mechanical Inspection 1. Document equipment nameplate data on the test report. 2. Check for broken operators, switches, or pilot lights; dented or bent enclosure structures. 3. Check for excessive dirt, dust, or moisture. 4. Verify that a properly sized grounding conductor is connected to the drive grounding lug and terminates on a ground lug in the power distribution panel. 5. Tighten all power wiring connections to proper torque value. Check line and load side connections of all disconnect switches, breakers, contactors, and overloads. 6. Check and tighten all control wiring connections, mounting hardware, drive control terminals and terminal block connections. 7. Check door and disconnect switch alignment and opening/closing operation. 8. Test all mechanical interlocking devices. 9. Manually operate all contactors to verify freedom of movement. 10. Verify that customer supplied fusing agrees with the manufacturer s recommendations. 11. Verify mechanical operation of isolation contactor. Tighten power and control connections. 12. Verify that all control and option boards are securely fastened and plug-in terminals are connected. 13. Check that properly sized thermal overloads are used in ISO/Bypass unit. 14. Document as found/ as left settings. B. Electrical Tests 1. Verify proper operation of the AFC-Off-Bypass selector switch (if used). 2. Set the AFC-Off-Bypass selector switch (if used) to Bypass and the Hand Off-Auto to Hand. Check the direction of motor rotation. Rotation should be clockwise (ABC) unless indicated differently by the project documentation. Note the as-found and as-left rotation on the start-up documentation. 3. Verify proper operation based on the High Speed (HSP) setting (maximum motor speed setting). Record your results. 4. Verify proper operation based on Check the Low Speed (LSP) setting (minimum motor speed setting). Record your results. 5. Verify that Hand and Auto controls, Start, Stop, and speed input, operate the drive correctly. 6. Check that all indicating lamps illuminate only for their assigned functions. Check all Push to Test lamps. 6

7 Scopes of Work for Electrical Maintenance: SECTION 4 AIR SWITCHES: LOW VOLTAGE SECTION 4 AIR SWITCHES: LOW VOLTAGE A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Inspect physical and mechanical condition and clean equipment. 3. Confirm correct application of manufacturer specified lubricants at recommended locations. 4. Verify appropriate anchorage and required area clearances. 5. Verify appropriate equipment grounding. 6. Verify correct blade alignment, blade penetration, travel stops, and mechanical operation. 7. Verify and record fuse sizes and types are in accordance with record drawings and, if available, coordination studies. 8. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no manufacturer s data is available, use the values in Table and Check all interlocking systems for correct operation and sequencing, and key distribution, if applicable. 10. Verify correct phase barrier installation. 11. Inspect all indicating and control devices for correct operation. 12. Check the condition of arc contacts and arc chutes. B. Electrical Tests NOTE: When performing dielectric tests, you must disconnect (or isolate) all Instrument and Control Transformers, Surge Protection Devices and other sensitive electronic equipment that may cause erroneous results or be damaged by the applied test voltage. Verify no paths to ground exist with an ohmmeter or initially testing insulation resistance at a low voltage. Record the date of the last calibration for each piece of test equipment used. 1. Perform insulation-resistance tests on each pole, phase-to-phase and phase-to-ground with switch closed and across each open pole for one minute. Test voltage shall be in accordance with manufacturer s published data or Table Test all auxiliary devices (solenoid trip, blown main fuse detector, etc.) for proper operation. 7

8 Scopes of Work for Electrical Maintenance: SECTION 4 AIR SWITCHES: LOW VOLTAGE Bulletin No. 1910DB Perform a Contact Resistance Test across each pole (phase): a. With the main power source de-energized, close and open the switch several times using either manual or electrical means. b. Apply a minimum current of 10 amperes dc through the closed contacts. If the test current does not conform to the manufacturer s specification, consult the manufacturer. c. Measure and record the median (middle) value of three readings (toggling the switch between each reading) compare with the manufacturers published information and adjacent poles. d. If the measured resistances are below the manufacturers published data and balanced, the condition of the device contacts is considered suitable for service. If the measured resistances exceed the manufacturers recommendations or are imbalanced, open and close the device several more times and repeat the test. Contact the factory if acceptable values of resistance cannot be achieved. 4. Measure fuse resistance to verify continuity. Take note of any deviations in excess of 15%. Record your results. 5. When ground fault protection is installed on switch, confirm settings are in accordance with the owner supplied coordination study. Verify proper calibration and operation by current injection. 8

9 Scopes of Work for Electrical Maintenance: SECTION 5 AIR SWITCHES: MEDIUM VOLTAGE, METAL-ENCLOSED SECTION 5 AIR SWITCHES: MEDIUM VOLTAGE, METAL-ENCLOSED A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Inspect physical and mechanical condition and clean equipment.. 3. Confirm correct application of manufacturer specified lubricants at recommended locations. 4. Verify appropriate anchorage and required area clearances. 5. Verify appropriate equipment grounding. 6. Verify correct blade alignment, blade penetration, travel stops, and mechanical operation. 7. Verify that fuse sizes and types are in accordance with drawings and, if available, coordination studies. 8. Inspect fuse holders for tightness and alignment. 9. Verify that expulsion-limiting devices are in place on all holders having expulsion-type elements. Verify that they are installed to vent in the proper direction. 10. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no manufacturer s data is available, use the values in Tables and Check all interlocking systems for correct operation and sequencing, and key distribution, if applicable. 12. Verify correct phase-barrier installation. 13. Inspect all indicating and control devices for correct operation. 14. Clean and inspect any connected surge arrestors and verify that they have been properly connected. Verify that they have the appropriate voltage rating per the manufacturer s drawings and system voltage, where applicable. B. Electrical Tests NOTE: When performing dielectric tests, disconnect all Instrument and Control Transformers, Surge Protection Devices, and other sensitive electronic equipment that may cause erroneous results or cause damage to equipment that is not rated in accordance with Switchgear industry standards. Verify no paths to ground exist with an ohmmeter or initially testing insulation resistance at a low voltage Record the date of the last calibration for each piece of test equipment used. 1. Perform insulation-resistance tests on each pole, phase-to-phase and phase-to-ground with switch closed and across each open pole for one minute. Test voltage shall be in accordance with manufacturer s published data or Table Verify that heaters have been connected and are operating properly. 3. Measure fuse resistance to verify continuity, record your results. 9

10 Scopes of Work for Electrical Maintenance: SECTION 5 AIR SWITCHES: MEDIUM VOLTAGE, METAL-ENCLOSED Bulletin No. 1910DB Perform a Contact Resistance Test across each pole (phase) a. With the main power source de-energized, close and open the switch several times using either manual or electrical means. b. Apply a minimum current of 10 amperes dc through the closed contacts. c. Measure and record the median (middle) value of three readings (toggling the switch between each reading) compare with the manufacturers published information and adjacent poles. d. If the measured resistances are below the manufacturers published data and balanced, the condition of the device contacts is considered suitable for service. If the measured resistances exceed the manufacturers recommendations or are imbalanced, open and close the device several more times and repeat the test. Contact the factory if acceptable values of resistance cannot be achieved. 5. Perform a dielectric test (Hi-Pot) on each pole with switch closed. Test each pole-to-ground with all other poles grounded. Test voltage shall be in accordance with manufacturer s published data or Table

11 Scopes of Work for Electrical Maintenance: SECTION 6 AIR SWITCHES: HIGH AND MEDIUM VOLTAGE, OPEN STYLE SECTION 6 AIR SWITCHES: HIGH AND MEDIUM VOLTAGE, OPEN STYLE A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Inspect physical and mechanical condition and clean equipment. 3. Confirm correct application of manufacturer specified lubricants at recommended locations. 4. Verify that grounding is in accordance with industry standards and project specifications. 5. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no, manufacturer s data is available, use the values in Tables and Perform mechanical operator tests in accordance with manufacturer s instructions. 7. Verify correct operation and adjustment of motor operator limitswitches and mechanical interlocks. 8. Verify correct blade alignment, blade penetration, travel stops, arc interrupter operation, and mechanical operation (over toggle). 9. Inspect fuse holders for tightness and alignment. 10. Check the condition of arc contacts and arc chutes. Verify correct size and type fuses if fuses are presently installed. B. Electrical Tests NOTE: When performing dielectric tests, disconnect all Instrument and Control Transformers, Surge Protection Devices, and other sensitive electronic equipment that may cause erroneous results or cause damage to equipment that is not rated in accordance with Switchgear industry standards. Verify no paths to ground exist with an ohmmeter or initially testing insulation resistance at a low voltage Record the date of the last calibration for each piece of test equipment used. 1. Perform insulation-resistance tests on each pole, phase-to-phase and phase-to-ground with switch closed and across each open pole for one minute. Test voltage should be in accordance with manufacturer s published data or Table Perform a contact-resistance test across each switch blade and fuse holder, record results. Compare with the manufacturer s published information and adjacent poles. Investigate any values that deviate from the manufactures recommended values. 3. Verify Operator targets and Gas targets, where applicable, are in proper sequence. 4. Perform a dielectric test (Hi-Pot) on each pole with switch closed. Test each pole-to-ground with all other poles grounded. Test voltage shall be in accordance with manufacturer s published data or Table

12 Scopes of Work for Electrical Maintenance: SECTION 7 SWITCHES: HVL/cc Bulletin No. 1910DB1303 SECTION 7 SWITCHES: HVL/cc A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Inspect physical and mechanical condition and clean equipment. 3. Verify appropriate anchorage and required area clearances 4. Verify that all power cables are properly terminated and supported. NOTE: When routing shielded cable through window-type current transformers or ground sensor current transformers, the shieldground connection wire is normally routed back through the current transformer and solidly grounded 5. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no manufacturer s data is available, use the values in Tables and Hi-Pot Test Values Equipment Field Test Voltages Rating AC DC 4.76kV 14kV 20kV 15kV 27kV 38kV 17.5kV 28.5kV 40kV 27kV 45kV 63kV 38kV 60kV 85kV 6. Inspect all control wiring. 7. If FuseLogic fuse trip system is installed, verify proper operation. 8. Verify all fuses are properly installed and clips lubricated with Mobil Verify that fuse sizes and types are in accordance with drawings and, if available, coordination studies. 10. Check all interlocking systems for correct operation and sequencing, and key distribution, if applicable. 11. If any isolating switch is not in operation and is left without incoming cables, the corresponding grounding switch must be closed and blocked by means of a padlock to avoid possible unintentional operation. 12. Verify appropriate equipment grounding. 13. Verify that all insulating surfaces are clean and dry. 14. Verify that all barriers and covers are secured 15. When equipped, verify proper operation of the ground switch and related interlocks. 16. Perform a minimum of 5 open / close operations while verifying smooth operation of the mechanism and all indicators. 17. Inspect all interlocks, indicating and control devices for correct operation. 12

13 Scopes of Work for Electrical Maintenance: SECTION 7 SWITCHES: HVL/cc B. Electrical Tests NOTE: Prior to performing dielectric tests, disconnect all Instrument and Control Transformers, Surge Protection Devices, Control and Power cables units, and other sensitive electronic equipment that may cause erroneous results or be damaged by the applied test voltage. Capacitive dividers supplied with the equipment must be properly connected or grounded. Verify no paths to ground exist with an ohmmeter or initially testing insulation resistance at a low voltage. Record the date of the last calibration for each piece of test equipment used. 1. Perform insulation-resistance tests on each pole, phase-to-phase and phase-to-ground with switch closed and across each open pole for one minute. Test voltage shall be in accordance with the above table. 2. Perform Hi-Pot test a. Apply voltage to each phase individually for one minute with the other two phases and enclosure grounded. (see table for hi-pot test values gradually increase voltage). 13

14 Scopes of Work for Electrical Maintenance: SECTION 8 METERING DEVICES Bulletin No. 1910DB1303 SECTION 8 METERING DEVICES A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Inspect physical and mechanical condition and clean equipment. 3. Confirm case is properly grounded. 4. Verify tightness of electrical connections. 5. For electro-mechanical devices, verify freedom of movement, correct travel, alignment, and tightness of mounting hardware. 6. For microprocessor based meters confirm and record settings for system configuration, CT and PT ratios, multipliers, communications and other specified parameters are in accordance with record drawings or customer supplied specifications. B. Electrical Tests Record the date of the last calibration for each piece of test equipment used. 1. Check calibration of meters according to the manufacturer s published data. 2. Electrically confirm that current transformer and voltage transformer secondary circuits are intact. 14

15 Scopes of Work for Electrical Maintenance: SECTION 9 BUSWAYS, METAL-ENCLOSED SECTION 9 BUSWAYS, METAL- ENCLOSED A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Inspect the busway for physical damage and clean equipment. 3. Inspect for appropriate bracing, suspension, alignment, clearances and enclosure grounding and bonding. 4. Verify that the neutral is only grounded at one point in accordance with NEC, CSA or other applicable standards. 5. Verify installation and proper operation of heaters, when applicable, 6. For outdoor busway, confirm removal of weep-hole plugs, if applicable, and the correct installation of joint shield(s). Verify that proper gasketing is in place. B. Electrical Tests NOTE: Prior to testing, confirm that all tap-off or plug-in devices are in the off position. Isolate the entire busway run by disconnecting any ties to transformers, switchboards, meters or other devices. Record the date of the last calibration for each piece of test equipment used. 1. Measure insulation resistance of each busway with an insulation resistance tester rated at 1000 volts. Make measurements phase-toground, phase-to-neutral and phase-to-phase and for one minute. Compare your results with Table Perform a dielectric test (Hi-Pot) on each bus section, phase-toground with phases not under test grounded, in accordance with Table NOTE: This test is standard on medium voltage busway and optional on low voltage busway. NOTE: The megohm readings should not be less than the value calculated from the following formula. Megohms = 100 / length of run (in feet) or Megohms = 30.5 / length of run (in meters) C. Optional Tests 1. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no manufacturer s data is available, use the values in Tables and

16 Scopes of Work for Electrical Maintenance: SECTION 10 OUTDOOR / SUBSTATION BUS Bulletin No. 1910DB1303 SECTION 10 OUTDOOR / SUBSTATION BUS A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Inspect the bus for physical damage and clean equipment. 3. Inspect for appropriate bracing, suspension, alignment, and proper grounding. 4. Verify that all support insulators are clean and undamaged. B. Electrical Tests Record the date of the last calibration for each piece of test equipment used. 1. Perform an insulation resistance test to confirm the system is free of any ground faults. Compare your results with Table Perform a dielectric test (Hi-Pot) on each bus, phase-to-ground with phases not under test grounded, in accordance with manufacturer s published data. Apply test voltage for one minute. Use test voltage values as shown in Table C. Optional Tests 1. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no, manufacturer s data is available, use the values in Tables and

17 Scopes of Work for Electrical Maintenance: SECTION 11 CABLES: LOW VOLTAGE SECTION 11 CABLES: LOW VOLTAGE A. Visual and Mechanical Inspection 1. Document cable sizing and insulation type. 2. Inspect the exposed sections of cables for physical damage and clean equipment. 3. Using a calibrated torque wrench, verify that the tightness of accessible bolted connections is in accordance with the manufacturer s published data. If no manufacturer s data is available, use the values in Tables and Inspect compression-applied connectors for correct cable match and indentation. B. Electrical Tests NOTE: When performing dielectric tests, disconnect all Instrument and Control Transformers, Surge Protection Devices, and other sensitive electronic equipment that may cause erroneous results or cause damage to equipment that is not rated in accordance with industry standards. 1. Verify that the opposite end of the cable run being tested is properly isolated from both adjacent equipment and personnel during testing. 2. Record the date of the last calibration date for each piece of test equipment used. 3. Perform an insulation resistance test on each conductor between one conductor and ground with the other conductors grounded. Each conductor shall be tested in the same manner. a. The test shall be performed at 1000 volts dc for one minute if the insulation rating of the cable under test is rated at 600V. For cables rated less than 600V, the Vdc test voltage should be a minimum of 1.41 times the Vac rating of the cable. b. Each 480V feeder cable shall be tested with the cable connected to the racked-in but open breaker or switch at the equipment. Connection at the other end of each of these cables shall be as follows: i. Cables to Motor Control Centers shall be connected to the bus with the switches or breakers in the starters open. ii. Cables to motors and other equipment shall be connected to the motors and equipment with feeder switches open. NOTE: All cables connected to motors and transformers are effectively connected through the windings. To obtain results for individual conductors, isolate the cables from the utilization equipment. 17

18 Scopes of Work for Electrical Maintenance: SECTION 12 CABLES: MEDIUM VOLTAGE Bulletin No. 1910DB1303 SECTION 12 CABLES: MEDIUM VOLTAGE A. Visual and Mechanical Inspection 1. Document cable sizing and insulation type. 2. Inspect the exposed sections of cables for physical damage and clean equipment. 3. Using a calibrated torque wrench, verify that the tightness of accessible bolted connections is in accordance with the manufacturer s published data. If no manufacturer s data is available, use the values in Tables and Inspect compression-applied connectors for correct cable match and indentation. 5. Inspect cable terminations for proper installation in accordance with the termination manufacturers instructions. B. Electrical Tests NOTE: When performing dielectric tests, disconnect all Instrument and Control Transformers, Surge Protection Devices, and other sensitive electronic equipment that may cause erroneous results or cause damage to equipment that is not rated in accordance industry standards. 1. Verify that the opposite end of the cable run to be tested is disconnected and isolated from personnel. 2. Record the date of the last calibration for each piece of test equipment used. 3. Perform a shield continuity test on each conductor 4. With cables isolated at both ends, perform an insulation resistance test on each conductor between the conductor and ground with the conductors not under test grounded. Each conductor shall be tested in the same manner. The test shall be performed at 1000 volts dc for one minute. NOTE: Cable testing technology is an evolving science. DC testing may not be suitable for some cable types (Such as XLPE), however, may be best suited for other types (such as EPR). The test method employed should be based on project requirements and discussions with the project engineer. C. Optional Tests 1. Perform a dielectric test on medium voltage shielded cable per Table Refer to the manufacturer s published data, and perform in accordance with IEEE 400, checking leakage current and decay voltage over the specified time period. 2. Very Low Frequency (VLF) 3. Perform power-factor or dissipation-factor tests on each cable. NOTE: For long cable runs it may be necessary to utilize a resonating inductor due to the large amount of capacitance in the cable. 18

19 Scopes of Work for Electrical Maintenance: SECTION 13 CAPACITORS: POWER FACTOR CORRECTION SECTION 13 CAPACITORS: POWER FAC- TOR CORRECTION A. Visual and Mechanical Inspection WARNING: Capacitors are energy storing devices. Care should be exercised and testing performed before physically touching the terminals of any capacitor. Although a voltage detection device might indicate that the capacitor is not electrically energized, the capacitor could be storing a lethal charge. Do NOT falsely assume that the internal discharge resistor is intact and functional. Always assume that a capacitor is charged unless the capacitor has been de-energized from its normal power source and the capacitor has been externally discharged. 1. Document equipment nameplate data on test report. 2. Inspect the physical and mechanical condition of the equipment and clean equipment. 3. Inspect the capacitors for the correct mounting and required clearances, per the manufacturer s recommended procedures. 4. Confirm all ventilation openings are clear and unobstructed. 5. Verify that capacitors are electrically connected in their specified configuration, per the manufacturer s recommended procedures. 6. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no manufacturer s data is available, use the values in Tables and B. Electrical Tests Record the date of the last calibration date for each piece of test equipment used. 1. Perform insulation-resistance tests from terminal(s) to case for one minute on capacitors with more than one bushing. The test voltage and minimum resistance shall be in accordance with the manufacturer s instructions or Table Measure and record the input voltage for the capacitor / bank. Voltage should not exceed the capacitor nameplate rating by more then 10%. 3. Measure the capacitance of all terminal combinations. 4. Measure the resistance of the internal discharge resistors. 19

20 Scopes of Work for Electrical Maintenance: SECTION 14 CIRCUIT BREAKERS:LV INSULATED CASE/ MOLDED CASE Bulletin No. 1910DB1303 SECTION 14 CIRCUIT BREAKERS: LOW VOLTAGE INSULATED CASE / MOLDED CASE A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Clean and inspect circuit breaker for damage, correct mounting, alignment and grounding. 3. Open and close the circuit breaker to insure smooth operation. 4. Confirm correct application of manufacturer specified lubricants at recommended locations. 5. Inspect case for cracks or other defects. 6. When applicable, inspect condition and alignment of arc chutes, moving and stationary contacts. 7. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no, manufacturer s data is available, use the values in Tables and Perform all mechanical operator and contact alignment tests on both the breaker and its operating mechanism. 9. Verify electric open/close and operation of installed accessories, such as Blown Fuse Indicators. Auxiliary Contacts, Cell Switches, Shunt Trip Devices, and Undervoltage Release. 10. Exercise the push to trip button to verify trip and reset. 11. When applicable, activate the Blown Fuse Indicator (BFI) and confirm by attempting to close the breaker without reset. 12. Verify rating plugs, sensors and settings are accordance with the coordination study supplied by the owner, if available. 13. Verify that all maintenance devices are available for servicing and operating the breaker. B. Electrical Tests NOTE: When performing dielectric tests, remove rating plugs, disconnects, all Instrument and Control Transformers, Surge Protection Devices, and other sensitive electronic equipment that may cause erroneous results or cause damage to equipment that is not rated in accordance with molded case circuit breaker industry standards. Record the date of the last calibration for each piece of test equipment used. 1. Perform a contact-resistance test in accordance with the following procedure. a. Open and close circuit breaker manually several times to ensure the mechanism linkages are free and operate properly. Trip the circuit breaker with the push to trip button if so equipped. Close the breaker. b. Measure the resistance across each pole with a digital lowresistance ohmmeter. 20

21 Scopes of Work for Electrical Maintenance: SECTION 14 CIRCUIT BREAKERS:LV INSULATED CASE/ MOLDED CASE c. Compare the resistance values with manufacturers published data and between phases. d. For circuit breakers manufactured by Schneider Electric compare your results to the values in Table Perform an insulation-resistance test at 1000 volts dc from pole-topole and from each pole-to-ground with breaker closed and across open contacts of each phase. Insulation resistance should be greater than 100 Megohms. 3. Verify correct operation of any auxiliary features such as trip and pickup indicators, electrical close and trip operation, trip-free, and anti pump function. 4. Perform the following trip unit / relay tests by secondary injection: a. Minimum pickup current. b. Long-time delay. c. Short-time pickup and delay. d. Ground-fault pickup and delay. e. Instantaneous pickup. C. Optional Tests 1. Perform the trip unit / relay tests utilizing primary current injection. 2. Perform a dielectric withstand test. 21

22 Scopes of Work for Electrical Maintenance: SECTION 15 CIRCUIT BREAKERS: LOW VOLTAGE POWER (ANSI/IEEE C37.13) Bulletin No. 1910DB1303 SECTION 15 CIRCUIT BREAKERS: LOW VOLTAGE POWER (ANSI/IEEE C37.13) A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Clean and inspect circuit breaker for shipping damage, correct mounting, alignment and grounding. 3. Open and close the circuit breaker to insure smooth operation. 4. Confirm correct application of manufacturer specified lubricants at recommended locations. 5. Inspect condition and alignment of arc chutes, moving and stationary contacts. 6. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no, manufacturer s data is available, use the values in Tables and Perform all mechanical operator and contact alignment tests on both the breaker and its operating mechanism. 8. Verify electrical open/ close operation of installed accessories, such as Blown Fuse Indicators. Auxiliary Contacts, Cell Switches, Shunt Trip Devices, and Undervoltage Release. 9. When applicable, activate the Blown Fuse Indicator (BFI) and confirm by attempting to close the breaker without reset. 10. Verify rating plugs, sensors and settings are accordance with the coordination study supplied by the owner, if available. 11. Verify that all maintenance devices are available for servicing and operating the breaker. B. Electrical Tests NOTE: When performing dielectric tests, remove rating plugs and disconnect all Instrument and Control Transformers, Surge Protection Devices, and other sensitive electronic equipment that may cause erroneous results or cause damage to equipment that is not rated in accordance with circuit breaker industry standards. Record the date of the last calibration for each piece of test equipment used. 1. Perform a contact-resistance test in accordance with the following procedure. a. Open and close circuit breaker manually several times to ensure the mechanism linkages are free and operate properly. Trip the circuit breaker with the push to trip button if so equipped. Close the breaker. b. Measure the resistance across each pole with a digital lowresistance ohmmeter. c. Compare the Resistance values with manufacturers published data and between phases. d. For circuit breakers manufactured by Schneider Electric compare your results to the values in Table

23 Scopes of Work for Electrical Maintenance: SECTION 15 CIRCUIT BREAKERS: LOW VOLTAGE POWER (ANSI/IEEE C37.13) 2. Perform an insulation-resistance test at 1000 volts dc from pole-topole and from each pole-to-ground with breaker closed and across open contacts of each phase. Insulation resistance should be greater than 100 Megohms. 3. Verify correct operation of any auxiliary features such as trip and pickup indicators, electrical close and trip operation, trip-free, and anti pump function. 4. Perform the following trip unit / relay tests by secondary injection: a. Minimum pickup current. b. Long-time delay. c. Short-time pickup and delay. d. Ground-fault pickup and delay. e. Instantaneous pickup. C. Optional Tests 1. Perform the trip unit / relay tests utilizing primary current injection. 2. Perform a dielectric withstand test. 23

24 Scopes of Work for Electrical Maintenance: SECTION 16 CIRCUIT BREAKERS: MEDIUM VOLTAGE AIR MAGNETIC Bulletin No. 1910DB1303 SECTION 16 CIRCUIT BREAKERS: MEDIUM VOLTAGE AIR MAGNETIC A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Clean the circuit breaker and inspect the physical and mechanical condition. 3. Confirm correct application of manufacturer specified lubricants at recommended locations. 4. Inspect anchorage and grounding. 5. Inspect and verify that adjustments of the mechanism are in accordance with the manufacturer s instructions. 6. Measure critical distances as recommended by manufacturer if indicated by contact resistance test results. 7. If required by the manufacturer, slow close/open breaker and check for binding. (This may not be possible in all cases where special or optionally supplied tooling is required) 8. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no manufacturer s data is available, use the values in Table and Record as-found and as-left counter operations. B. Electrical Tests 1. Record the date of the last calibration for each piece of test equipment used. a. Perform a contact-resistance test in accordance with the following procedure. b. Open and close circuit breaker manually several times to ensure the mechanism linkages are free and operate properly. c. Measure the resistance across each pole with a digital lowresistance ohmmeter. d. Compare the Resistance values with manufacturers published data and between phases. 2. Perform insulation-resistance tests pole-to-pole, pole-to-ground, and across open poles in accordance with Table Verify trip, close, trip-free, and antipump functions. 4. Trip the circuit breaker by operating each protective device. 5. Perform a Hi-Pot (dielectric) test in accordance with the manufacturer s instructions. 24

25 Scopes of Work for Electrical Maintenance: SECTION 16 CIRCUIT BREAKERS: MEDIUM VOLTAGE AIR MAGNETIC C.Optional Tests 1. Perform an insulation-resistance test on all control wiring in accordance with Table Do not perform this test on wiring connected to solid- state relays. 2. Perform time-travel analysis using a travel distance analyzer. 3. Perform dissipation-factor/power-factor tests on breaker and bushings on each pole with the breaker open, and on each phase with the breaker closed. 4. Perform a minimum pick-up voltage test on trip and close coils. 25

26 Scopes of Work for Electrical Maintenance: SECTION 17 CIRCUIT BREAKERS: MEDIUM VOLTAGE SF6 Bulletin No. 1910DB1303 SECTION 17 CIRCUIT BREAKERS: MEDIUM VOLTAGE SF6 A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Clean and inspect the physical and mechanical condition of the breaker. 3. Confirm that lubricants have been correctly applied at the manufacturer's recommended locations. 4. Inspect anchorage and grounding. 5. Inspect and verify that adjustments of the mechanism are in accordance with the manufacturer's instructions. 6. Check indicators for gas leaks in accordance with the manufacturer's instructions. 7. Verify correct operation of all air and SF6 gas pressure switches, alarms and cutouts. (NOTE: For sealed interrupters, the pressure cannot be varied to change the state of pressure switches.) 8. If required by the manufacturer, slow close/open breaker and check for binding. (This may not be possible in all cases where special or optionally supplied tooling is required) 9. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no manufacturer's data is available, use the values in Table and Record as-found and as-left counter operations. B. Electrical Tests Record the date of the last calibration for each piece of test equipment used. 1. Perform a contact-resistance test in accordance with the following procedure. a. Open and close circuit breaker manually several times to ensure the mechanism linkages are free and operate properly. b. Measure the resistance across each pole with a digital lowresistance ohmmeter. c. Compare the Resistance values with manufacturers published data and between phases. 2. Perform insulation-resistance tests pole-to-pole, pole-to-ground, and across open poles in accordance with Table Perform a Hi-Pot (dielectric) test in accordance with the manufacturer s instructions. 4. Verify trip, close, trip-free, and antipump functions. 5. Trip the circuit breaker by operating each protective device. 26

27 Scopes of Work for Electrical Maintenance: SECTION 17 CIRCUIT BREAKERS: MEDIUM VOLTAGE SF6 C. Optional Tests 1. Perform an insulation-resistance test on all control wiring in accordance with Table Do not perform this test on wiring connected to solid-state relays. 2. Perform time-travel analysis using a travel distance analyzer. 3. Perform dissipation-factor/power-factor tests on breaker and bushings on each pole with the breaker open, and on each phase with the breaker closed. 4. Perform a minimum pick-up voltage test on trip and close coils. 27

28 Scopes of Work for Electrical Maintenance: SECTION 18 CIRCUIT BREAKERS: MEDIUM VOLTAGE VACUUM Bulletin No. 1910DB1303 SECTION 18 CIRCUIT BREAKERS: MEDIUM VOLTAGE VACUUM A. Visual and Mechanical Inspection 1. Document equipment nameplate data on test report. 2. Clean the circuit breaker and inspect physical and mechanical condition. 3. Confirm correct application of manufacturer specified lubricants at recommended locations. 4. Inspect anchorage, alignment, and grounding. 5. Inspect and verify that adjustments of the mechanism are in accordance with the manufacturer s instructions. 6. Measure critical distances, such as contact gap, as specified by the manufacturer s service bulletin. 7. Using a calibrated torque wrench or low resistance ohmmeter, verify that the tightness of accessible bolted connections and/or cable connections are in accordance with the manufacturer s published data. If no manufacturer's data is available, use the values in Tables and Record as-found and as-left operation counter readings. B. Electrical Tests NOTE: When performing dielectric tests, disconnect all Instrument and Control Transformers, Surge Protection Devices, and other sensitive electronic equipment that may cause erroneous results or cause damage to equipment. Surge Protection Devices must be completely disconnected from the electrical system (including neutral and ground). Record the date of the last calibration for each piece of test equipment used. 1. Perform a contact-resistance test in accordance with the following procedure. a. Open and close circuit breaker manually several times to ensure the mechanism linkages are free and operate properly. b. Measure the resistance across each pole with a digital lowresistance ohmmeter. c. Compare the Resistance values with manufacturers published data and between phases. 2. Verify the trip, close, trip-free, and antipump functions. 3. Trip the circuit breaker by operating each protective device. 4. Perform insulation-resistance tests pole-to-pole, pole-to-ground, and across open circuit breaker separable contacts in accordance with Table Perform a vacuum bottle integrity test in strict accordance with manufacturer's instructions. Note: Some manufacturers specify either AC or DC voltage for this test. Contact the manufacturer if repeated consistent breakdowns are encountered. 28