Summary

• Power Grid Supply can refurbish any type of switch from 13kV to 500kV.
• We guarantee the switch will look like new and will operate as good if not better than when it was originally installed.
• All components used in our process meet or exceed OEM standards.
• Depending on the condition of the switch we can turn it around in 10 days to 2 weeks. Emergency expedited service is also available.
• We handle all the details of shipping and handling. All you need to do is get the switch down and loaded on a pallet and we will do the rest.
• We can typically save at least half the cost of a new switch and it will bolt back in place with no adjustment to the structure or bus work.
• New switches typically require engineering time as well as structural changes.
• We are more than happy to visit your specific site to assess your needs and develop an estimate before you get to the point of taking down the switch

Refurbishment Process

• All switches are assessed and documented before work starts
• Obvious problems are noted
• Photos are taken and archived

–In process photos are taken as needed and archived

• Replaceable parts such as jaw and hinge contacts are documented on Solidworks so the part can be duplicated later if needed
• List of material needs generated
• Estimate is generated and provided to the customer for approval
  • Once work has been approved the switch is completely dismantled to its component parts
  • Components that need to be repaired or replaced are identified
  • Every part is examined down to individual screws, springs, seals, bearings etc.
  • Any part that appears to have been compromised is replaced. Some parts are replaced on every job regardless of appearance

  –Springs

  –Hardware on aluminum switches

  • We replace OEM parts with like parts.
  • Where we can improve the operation or ongoing maintenance of a switch we will make modifications

  –Adding zirc fittings to bearing housings so sealed bearings can be lubed on a regular basis

  –We use improved seal and bearing materials where possible

  –We will modify accessibility to a critical part of a switch in order to make it easier to service in the future (Example: Delta Star hinge)

• • Once the switch is dismantled every part is cleaned or replaced
  • All damaged parts are repaired or replaced with new parts

  –Contacts
  –Bearings
  –Seals
  –Operating arms and joints
  –Base plates

  • All repaired parts are inspected before they are installed on the switch
  • All contacts are silver plated
  • Switch is re-assembled
• –All operating points of the switch are greased

  –All hardware is treated with anti seize grease

  –All contacts are treated with conductive grease

  • Switch is bench tested for opening and closing and adjusted to the extent the switch can be adjusted
  • Contact pressure is checked to ensure proper contact at the jaw and hinge
  • Switch is ductor tested both before and after refurb and results are reported as part of the documentation
  • Final switch is photographed and logged into the database
  • Switch is packaged to ship