44 kV pad mounted transformer - where to find
44 kV pad mounted transformer - where to find
(OP)
My Client in Canada has an unusual request to connect a small 400 V, 2000 kVA generator to a 44 kV grid using a pad mounted step up transformer 0.4/44 kV WYE/DELTA with both 400 V and 44 kV cable terminations located inside a metal enclosure bolted onto the transformer.
The transformer enclosure should also somehow accommodate fuses on the HV side (probably hidden somewhere behind HV terminals and accessible from the top).
I can’t seem to locate any manufacturers who would can make CSA (or ANSI) approved pad mounted transformers at 44 kV level (or 46 kV), and especially not with fuse assemblies built-in. Transformer manufacturers I contacted would go with pad mounted design with or without fuse up to 38 kV max (usually up to only 34.5 kV). Over 38 kV only transformers with external top or side mounted bushings would be available. Does someone have an idea how to approach this? Thank you in advance.
The transformer enclosure should also somehow accommodate fuses on the HV side (probably hidden somewhere behind HV terminals and accessible from the top).
I can’t seem to locate any manufacturers who would can make CSA (or ANSI) approved pad mounted transformers at 44 kV level (or 46 kV), and especially not with fuse assemblies built-in. Transformer manufacturers I contacted would go with pad mounted design with or without fuse up to 38 kV max (usually up to only 34.5 kV). Over 38 kV only transformers with external top or side mounted bushings would be available. Does someone have an idea how to approach this? Thank you in advance.






RE: 44 kV pad mounted transformer - where to find
Pad-mounted units are more standardized, so there may not be as much flexibility there.
RE: 44 kV pad mounted transformer - where to find
RE: 44 kV pad mounted transformer - where to find
If they have not, then ask where does the spec comes from? May be the specs are based on lesser voltage equipent. It may be time to educate the client. I would rather check with some leading manufacturers though.
RE: 44 kV pad mounted transformer - where to find
The Client is also unaware of such application. Since this is a private wind farm, where normally the collection voltage would be lower, say 13.8, 22, 27.6 kV, etc, for which a pad mounted TR is easily available, and then that voltage would be further stepped-up to a public network by another substation type TR 27.6/X kV (where x = 44kV in this case).
My client is, however, researching options as how to reduce the cost eliminating this intermediate TR, which would be fairly large (10 MVA - for 5 units connected to the same line) but for now seems rather unlikely to find anything except conventional substation TR type with bushings, what the Clinet don't seem to like - should be something tamperproof such as pad mounted...