Procurement
Transformer replacement after a failure
Send the nameplate and the date the site needs power back. We match the replacement to the existing installation first, then set out each supply option with its condition and delivery basis.
- Nameplate photograph
- the whole plate, legiblerating, voltages, vector group, impedance
- Photographs of the unit
- front, sides and cable connectionsthey show the fittings and the connections
- Date power is needed
- the latest acceptable dateit decides which options are worth checking
- Availability
- checked per requestagainst the date you give
Daverlan starts from the nameplate. We turn it into a specification a manufacturer can quote, check which supply routes can meet your date, and tell you when none can.
What the replacement has to match
| Item | Why it matters | Where it comes from |
|---|---|---|
| Rating and voltage pair | A different ratio will not work on the existing network and installation | The nameplate |
| Vector group | It must suit the earthing arrangement and any unit in parallel | The nameplate |
| Impedance | Units in parallel share load in proportion to it, and it sets the fault level at the board | The nameplate or the test report |
| Tapping range | The network voltage at the connection point has to be reachable | The nameplate |
| Footprint, cable boxes and bushing positions | A unit that does not fit the plinth or the cables adds site work | Photographs and the site drawing |
| Construction and liquid | The room, the containment and the fire strategy were built for it | The nameplate and the site |
What happens after the nameplate arrives
Read and check
We read the plate into a specification and ask for anything illegible or missing in the first reply.
Match the installation
We confirm each item that has to match, so every offer is for a unit that fits.
Check the routes
We ask the manufacturers whose range covers the specification whether they can build or supply a unit to it by your date.
Set out the options
You receive the options side by side, each with its condition, documents, delivery basis and validity.
Supply options and what each needs
| Option | When it is considered | What has to be on file |
|---|---|---|
| New, built to the specification | Always | Datasheet, drawing, routine test report on delivery |
| New, from a manufacturer's short delivery range | Where a manufacturer publishes such units and one matches | The same documents, and the match confirmed item by item |
| Surplus, unused | When you accept it | Documents, storage history and a test before dispatch |
| Refurbished | When you accept it | The work done, the parts replaced and the test results |
Availability by your date is checked for each request and confirmed in writing.
What we need to quote a replacement
- Nameplate photograph, and photographs of the unit and its connections
- The latest date the site can accept, and whether a temporary supply exists
- Indoor or outdoor, ambient temperature, altitude and any corrosive or dusty exposure
- The standard and the loss requirement the destination market applies
- Quantity, destination and the date the equipment has to be on site
- Whether surplus or refurbished units are acceptable, or new only
Specification template
Fill it in on screen or by hand, then upload it with your request.
Questions buyers ask
How long does it take to replace a transformer?
It depends on whether a matching unit exists, on manufacturer loading if one has to be built, and on the site work. Each option we set out carries its own delivery basis.
Can you send a unit today?
No. We hold no stock. The first step is the specification from your nameplate and a check of which supply routes fit your date.
Do you install or commission the replacement?
No. A qualified contractor removes, installs, tests and commissions the unit, and the network operator handles the connection where it applies.