Masterclad 15 kV Class Medium Voltage Switchgear Indoor Switchgear – Instruction Bulletin PDF
6055-30, Rev. 4

Start-up

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, or Arc Flash
  • 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 using 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 electric 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.
  • Open all circuit breaker and switch contacts and discharge all springs before performing maintenance work, disconnection, or removal of a circuit breaker.
  • Move circuit breakers to the disconnected position before removing rear access panels.
  • Conduct electrical testing to confirm no short-circuits were created during installation, maintenance, or inspection.
  • Never insert a circuit breaker into a circuit breaker compartment that is not complete and functional.
  • The complete assembly arrangement determines if the top or bottom contacts are the line side; both can be energized when the circuit breaker is removed from the compartment. Identify the line side contacts for each circuit breaker compartment.
  • Disconnect all high voltage to the switchgear before accessing the horizontal bus compartment.
  • Do not use liquid fire extinguishers or water on electrical fires. Before extinguishing fires within the assembly, ensure the main power source is disconnected and the main and all feeder circuit breakers are open.
  • 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 manual are written with the assumption that the customer has taken these measures before performing maintenance or testing.
  • All personnel involved in the start-up operation should be thoroughly familiar with the information in this instruction bulletin and on provided customer drawings before working on this equipment.
Failure to follow these instructions will result in death or serious injury.

Training of personnel for final start-up can be provided. Contact your local Schneider Electric field sales representative for information.

Preliminary Start-Up Procedures

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

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

  3. Verify that all insulating boots are installed correctly and properly closed. Verify that primary cable connections are properly insulated.

  4. Verify that any customer installed low voltage cables with ground shield maintain 6 inches distance from primary conductors.

  5. Verify primary cable routing is properly installed as per instructions provided in previous sections.

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

  7. Install the cable compartment back covers.

  8. Connect the battery charger and batteries (if used) to the switchgear control bus according to the order drawings.

  9. Unblock all of the relays and set to the relay schedule. Using a relay tester, verify the settings and electrical operation of each relay.

  10. Verify that any control power transformer used has the current limiting fuses in place. Pull the drawer out to the withdrawn position.

Installing and Testing Circuit Breakers in the TEST/DISCONNECT Position

Follow the steps for installing and testing the circuit breaker in the TEST/DISCONNECT position outlined in Circuit Breaker Operation.

Operation

Before energizing the equipment (If necessary, use an external control power source):

  1. Rack one circuit breaker at a time following the steps outlined in Circuit Breaker Operation.

  2. While in the Test/Disconnect position, electrically close and open the circuit breaker with the door-mounted circuit breaker control switch. Open the circuit breaker by temporarily closing the contacts of each protective relay. Reset the relay targets after each operation.

  3. Electrically operate from remote control locations and check the remote indicating lights.

  4. Operate all electrical interlocks, transfer schemes, lock-out relays, and other control functions to validate proper operation.

  5. Remove the temporary source of low voltage power (if used) and make the permanent connection of low voltage power. Rack all circuit breakers to the Connected position.

  6. If drawout fuses and drawout voltage transformers are included in the installation, rack them into the connected position by following the steps outlined in Voltage Transformer, Control Power Transformer, and Fuse Drawout Units.

  7. Using a properly rated voltage sensing device, verify again that trip voltage is available at the circuit breaker control terminals in each compartment.

Energizing the Switchgear

To establish electrical service follow these steps:

  1. Energize the incoming high voltage circuits.

  2. Close the main circuit breakers.

  3. Close the feeder circuit breakers.

  4. Energize loads one at a time.

QR Code is a registered trademark of DENSO WAVE INCORPORATED in Japan and other countries.

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