Open AccessComparison of CT secondary open‐circuit protection system technologies
Author(s) -
Robertson Jeff
Publication year - 2018
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.0275
Subject(s) - bushing , silicon carbide , transformer , varistor , electrical engineering , materials science , automotive engineering , voltage , engineering , mechanical engineering , composite material
Should a current transformer (CT) secondary winding be left in or inadvertently become open circuited while the primary is energised, then damage may occur to the CT – leaving it inoperable or seriously effecting its measurement accuracy. If the CTs are being utilised in particularly difficult places to access, such as in a gas insulated substation or in a power transformer bushing, this can then lead to an expensive repair to a relatively inexpensive component. To prevent damage occurring to open‐circuited CT's, a range of products are available. These devices are based either on a silicon carbide varistor‐based technology or on a gas discharge tube‐based technology. The purpose of this study is to compare the performance of these devices.