How to specify and use metalclad switchgear

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Electrical World; (United States)

OSTI ID:7165156

The following standards requirements, which address safety and operating features, serve to distinguish metalclad from other switchgear arrangements: drawout circuit breakers; insulated busbars; grounded metal segregation between the main and feeder buses; grounded metal segregation between circuit-breaker cubicles; isolation of low-voltage control circuits; and withdrawable potential transformers. These major attributes of metalclad switchgear have remained constant over several decades, even as medium-voltage circuit breakers have recently undergone significant changes. The major evolution has been from oil and air-break circuit breakers to breakers with vacuum and SF[sub 6] interrupters. There is also a trend toward microprocessor-based protective relays and metering-away from or supplementary to electromagnetic relays and discrete meters.

• OSTI ID: 7165156
• Journal Information: Electrical World; (United States), Journal Name: Electrical World; (United States) Vol. 207:4; ISSN 0013-4457; ISSN ELWOA3
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
426000* -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
CIRCUIT BREAKERS
ELECTRIC UTILITIES
ELECTRICAL EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
MAINTENANCE
PUBLIC UTILITIES
SPECIFICATIONS