PremSet™ Medium Voltage Switchgear: Control Power Transformer Class 6045 – Supplemental Instruction Bulletin
46010-523-01

Installation

Before following the installation instructions for this section, refer to the following sections in instruction bulletin no. 46010-519 (PremSetTM Medium Voltage Switchgear) and 46010-521 (Outdoor Medium Voltage Switchgear, Supplemental Instruction Manual).

Ensure that the environmental controls (thermostat, humidistat, etc.) are set to mitigate condensation, including times when the equipment is lightly loaded (such as storage, downstream loads de-energized, etc.). Consult the engineer of record for the appropriate environmental control setting.

Installing the Equipment

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
  • Refer to the hazard statements and recommendations in instruction bulletin 46010-519, PremSet Medium Voltage Switchgear (ANSI/UL Version), before using this manual.
  • Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462.
  • This equipment must be installed and serviced only by qualified electrical personnel.
  • Perform such work only after reading and understanding all of the instructions contained in this bulletin.
  • 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.
  • Before performing visual inspections, tests, or maintenance on this equipment, disconnect all sources of electrical power. Assume all circuits are live until they are completely de-energized, tested, and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of backfeeding.
  • Always practice lock-out/tag-out procedures according to OSHA requirements.
  • Carefully inspect your work area, and remove any tools and objects left inside the equipment.
  • Replace all devices, doors, and covers before turning on power to this equipment.
  • All instructions in this bulletin are written with the assumption that the customer has taken these measures before performing maintenance or testing.
Failure to follow these instructions will result in death or serious injury.
NOTICE
Hazard of equipment damage
Do not substitute any other fuse.
Failure to follow these instructions can result in equipment damage.

CPT Primary Fuses

This section is for indoor and outdoor applications, The front access to the fuse compartment is always available for both applications.

To facilitate the installation/removal of the fuses, the following covers are required to be removed in addition to the front cover:

  • Indoor Front and Rear connection - side cover.

  • Outdoor - Rear cover.

All the PremSet sections are shipped individually. For joining and anchoring shipping sections, refer to “Section 7: Switchgear Installation” in instruction bulletin no. 46010-519 (PremSetTM Medium Voltage Switchgear) and 46010-521 (Outdoor Medium Voltage Switchgear, Supplemental Instruction Manual).

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
  • Refer to the hazard statements and recommendations in instruction bulletin 46010-519, PremSet Medium Voltage Switchgear (ANSI/UL Version), before using this manual.
  • Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462.
  • This equipment must be installed and serviced only by qualified electrical personnel.
  • Perform such work only after reading and understanding all of the instructions contained in this bulletin.
  • 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.
  • Before performing visual inspections, tests, or maintenance on this equipment, disconnect all sources of electrical power. Assume all circuits are live until they are completely de-energized, tested, and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of backfeeding.
  • Always practice lock-out/tag-out procedures according to OSHA requirements.
  • Carefully inspect your work area, and remove any tools and objects left inside the equipment.
  • Replace all devices, doors, and covers before turning on power to this equipment.
  • All instructions in this bulletin are written with the assumption that the customer has taken these measures before performing maintenance or testing.
Failure to follow these instructions will result in death or serious injury.
NOTICE
Inadequate Transformer Protection
Do not substitute any other fuse.
Failure to follow these instructions can result in equipment damage.

Installing the Fuse

  1. Review the assembly drawings to ensure the shipping sections are assembled in the correct order. Always use a properly rated voltage sensing device to confirm power is off.

  2. The fuses are shipped as a kit in a separate cradle. Locate the fuses and confirm the ratings match the order specifications.

  3. Always use a properly rated voltage sensing device to confirm that power is off. Always wear personal protective equipment appropriate for the hazard when handling the fuses.

  4. To install for the first time:

    1. To install the fuse for indoor applications, access the fuse compartment from the front and side. Remove the front and side panels as shown in the figures below.

      Front and side panels

      A: 7 HM6x20 + CS washers

      B: 3 HM6x20 + CS washers + grooved flanged nuts

      A: Insulation boots (One per phase)

      B: Primary fuses

      C: Insulation barriers

      D: Control power transformer

      NOTE: When removing the front metal barrier, the main ground connection fixation hardware is removed.

    2. To install the fuse for outdoor applications, access the fuse compartment from the front and rear. Remove the front and rear panels as shown in the figures below.

      Front and rear panels

    3. Cut the wire ties temporarily holding the boot in place. Open the boot and move it from the top fuse holder, then carefully push the boot down. Note that the CPT primary cable passes through the insulated boot at the lower fuse holder, so move the boot carefully as shown in the figure below. Follow this procedure for both fuses.

      Boot removal

    4. Wearing personal protective equipment, grasp the fuse near the fuse clip and gently pull while rotating the fuse to help ease it into the fuse holder. Insert the fuses one end at a time into the fuse clips.

      Fuse within fuse holder

  5. Carefully move the boot and position it so it covers the body of the fuse and fuse holder. These boots are designed to be closed by wire ties. Make sure that all the wire ties are installed on each hole provided to close the gaps between the boot lips.

  6. DANGER
    HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
    • Ensure that all fuses and red boots and barriers are properly installed.
    • Replace all devices, doors, and covers before turning on the power supply.
    Failure to follow these instructions will result in death or serious injury.

    Replace all the covers, doors, and side panels removed on previous steps. Ensure that the ground connection is installed and tightened properly as shown:

    Covers, doors and side panels removal

  7. For connection and coupling details, refer to the instruction bulletin and order drawings of the equipment to be connected.

  8. For civil commissioning and switchgear installation instructions, follow the 46010-519 instruction bulletin and 46010-521 instruction manual.

Replacing the Fuse

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
  • 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 the power supply.
Failure to follow these instructions will result in death or serious injury.

  1. Review the assembly drawings to ensure the shipping sections are assembled in the correct order.

  2. The fuses are shipped as a kit in a separate cradle. Locate the fuses and confirm the ratings match the order specifications.

  3. Always use a properly rated voltage sensing device to confirm that power is off. Always wear personal protective equipment appropriate for the hazard when handling the fuses.

  4. For installed units where the fuses need to be replaced:

    1. To install the fuse for indoor applications, access the fuse compartment from the front and side. Remove the front and side panels as shown in the figures.

      NOTE: When removing the front metal barrier, the main ground connection fixation hardware is removed as shown in the figure

    2. To install the fuse for outdoor applications, access the fuse compartment from the front and rear. Remove the front and rear panels as shown in the figures.

    3. Cut the all the wire ties temporarily holding the boot in place. Open the boot and move it from the top fuse holder, then carefully push the boot down. Note that the CPT primary cable passes through the insulated boot at the lower fuse holder, so move the boot carefully as shown in the figure. Follow this procedure for both fuses.

    4. Wearing personal protective equipment, grasp the fuse near the fuse clip and gently pull while rotating the fuse to help ease it into the fuse holder. Insert the fuses one end at a time into the fuse clips as shown in the figure.

      To avoid nuisance tripping, always replace all fuses, even if only one has blown.

  5. Carefully move the boot and position it so it covers the body of the fuse and fuse holder. These boots are designed to be closed by wire ties. Make sure all the wire ties are installed on each hole provided to close the gaps between boot lips.

  6. DANGER
    HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
    • Ensure that all fuses and red boots and barriers are properly installed.
    • Replace all devices, doors, and covers before turning on the power supply.
    Failure to follow these instructions will result in death or serious injury.

    Replace all the covers, doors, and side panels removed on previous steps. Ensure that the ground connection is installed properly as shown in the figure.

  7. For connection and coupling details, refer to the instruction bulletin and order drawings of the equipment to be connected.

  8. For civil commissioning and switchgear installation instructions, follow the 46010-519 instruction bulletin and 46010-521 instruction manual.

Joining the Main and Ground Bus

Install the main bus only after all sections are securely anchored in place and no additional movement of the assembly will occur. The bus bar are shipped with the miscellaneous items. The main bus connection to the CPT section only includes phase A and phase B. The phase B ends at the adjacent section and a bus bar spacer is used as shown in the figure.

For main bus and ground bus installation, refer to the “Locking the Cubicles and Assembling the Cable Shield Bus” section in “Section 7: Switchgear Installation” in instruction bulletin no. 46010-519 (PremSetTM Medium Voltage Switchgear).

Testing and Energizing

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
  • Refer to the hazard statements and recommendations in instruction bulletin 46010-519, PremSet Medium Voltage Switchgear (ANSI/UL Version), before using this manual.
  • Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462.
  • This equipment must be installed and serviced only by qualified electrical personnel.
  • Perform such work only after reading and understanding all of the instructions contained in this bulletin.
  • 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.
  • Before performing visual inspections, tests, or maintenance on this equipment, disconnect all sources of electrical power. Assume all circuits are live until they are completely de-energized, tested, and tagged. Pay particular attention to the design of the power system. Consider all sources of power, including the possibility of backfeeding.
  • Always practice lock-out/tag-out procedures according to OSHA requirements.
  • Carefully inspect your work area, and remove any tools and objects left inside the equipment.
  • Replace all devices, doors, and covers before turning on power to this equipment.
  • All instructions in this bulletin are written with the assumption that the customer has taken these measures before performing maintenance or testing.
Failure to follow these instructions will result in death or serious injury.

After the PremSetTM switchgear lineup has been installed and connected to the downstream equipment, a final check must be conducted before it is put in service.

  1. Turn off all main and control power supplying the equipment.

  2. Examine all control wires to make sure they have not been damaged or loosened.

  3. With the CPT fuses removed, perform the steps outlined in “Hi-Pot Testing” in the “Switchgear Commissioning” section of instruction bulletin no. 46010-519 (PremSet™ Medium Voltage Switchgear). After the test is completed, follow the instruction to replace the fuses.

  4. Perform a loading check of the control circuits. Perform continuity and insulation tests of the switchgear components to ensure proper installation of all primary components.

  5. Remove test power or test voltage and any test lead used in the previous step.

  6. Vacuum every compartment. Remove all loose parts, tools, miscellaneous construction items, and litter.

  7. Verify that all insulating boots are installed.

  8. Replace all of the main bus covers and any other barriers or covers that were removed during installation.

For testing and energizing, refer to the sections “Electrical Testing”, “Hi-Pot Testing”, and “MV Commissioning, Contact Resistance Test” in the “Switchgear Commissioning” section of instruction bulletin no. 46010-519 (PremSet™ Medium Voltage Switchgear).

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