Characteristics of Semiconductor Fuses for Scr-Protection

Abstract

Silicon Controlled Rectifier (SCR) applications have been increasing at a very rapid pace. There has been a parallel development of semiconductor fuses for SCR-protection. A lot of work has been done in finding an optimum way of comparing fuse and semiconductor data. In this paper, the various ratings and characteristics of a semiconductor fuse, their dependence on circuit conditions and their relations to SCR characteristics are examined. The wide range of factors which govern fuse behaviour indicate the care that must be taken to select a SCR-fuse co-ordination. SCR behaviour is also examined indicating how real conditions differ from those specified in data books. This will also clarify principles governing fuse operations.

Indexing Terms:

• SCR Protection
• Semiconductor Fuses

Additional information

Notes on contributors

O. Ramesh

Ramesh, O: Graduated from IIT, Madras in 1969 and did his MTech in the area of Induction Motor Control from IIT, Madras in 1971. Till 1973 he worked as Senior Research Associate in IIT, Madras. Then he joined Best * Crompton in the area of thyristor control. In 1978, he joined the DC Drive group of BHEL, Bangalore. Presently he is working on his PhD at Virginia Polytechnic, USA.

A. Bhandari

Bhandari, Ashok: (b. 1955 Jan 13). Obtained B Tech in Elect. Engg. from IIT, Kanpur in 1976. Joined Control Equipment Divn., BHEL in 1977 and worked in the area of dc drives. Since 1980, working in the area of power station controls. Was trained in the design and project engineering of sequential controls for power stations at Brown Boveri * Co., Switzerland and published papers.

Presently, working in the area of steam turbine controls.