Protecting distribution transformers from low-side current surges

Author

Dugan, Roger C. ; Kershaw, Stanley S., Jr. ; Smith, Stephen D.

Author_Institution

McGraw-Edison Power Syst., Franksville, WI, USA

Volume

5

Issue

4

fYear

1990

fDate

10/1/1990 12:00:00 AM

Firstpage

1892

Lastpage

1901

Abstract

The low-side surge problem in distribution transformers is discussed. The authors view the problem globally, discussing means to protect the transformer and the effect that they will have on the load appliances. The intent is to highlight the need for coordinated arrester protection at both ends of the secondary service drop in the geographical regions that have low-side current-surge problems. The authors survey the low-side surge problem and discuss alternatives for protecting the transformer and load apparatus. Rating and reliability issues of arresters are discussed. Arresters applied at the transformer or at the service entrance should have about one half of the current-surge capacity of distribution-class arresters. Arresters should have a protective level of 2 kV for the service entrance, while 4-6 kV appears adequate for the transformer

Keywords

power transformers; surge protection; transformer protection; 2 kV; 4 to 6 kV; coordinated arrester protection; distribution transformers protection; low-side current surges; rating; reliability; Arresters; Circuits; Home appliances; Lightning; Power cables; Power system protection; Power transformer insulation; Stress; Strontium; Surge protection;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.103686

Filename

103686