Submersible Dry-Type Transformer

Author

Navarro, Martin A. ; Monteiro, Antonio J.

Author_Institution

Cast Resin Transformers Dev., Siemens Ltd., Jundiai, Brazil

Volume

30

Issue

5

fYear

2015

Firstpage

2189

Lastpage

2194

Abstract

This paper describes the concept and development of dry-type transformers for underground distribution networks, capable of operating in the open air, partially submerged or completely submerged without enclosure and in contact with water. The rating is in the range of 500 kVA to about 2000 kVA and 15- or 25-kV voltage. Immersion depth is limited to 3 m, due to the limits of the plug-in connectors on the high-voltage (HV) side of the transformer. A tap panel is provided on HV coils for ±5.0%. Dimensions and losses are comparable to those of liquid-immersed transformers. Electrical insulation is fully solid. The HV coils are shielded and the shield is grounded.

Keywords

coils; electric connectors; power transformer insulation; underground distribution systems; HV coil; Immersion depth; electrical insulation; plug-in connector; submersible dry-type transformer; underground distribution network; Coils; Current transformers; Instrument transformers; Insulation; Power transformer insulation; Windings; Distribution; dry sub; dry type; environment; explosion risk submersible; fire; grounding; network; panel; plug in; safety; shield; taps; underground transformer;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2015.2393252

Filename

7010932