Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

BCT

Symbols

Bushing current transformer

A bushing CT is a toroidal core and secondary slipped over the bushing of a power transformer, generator or dead-tank circuit breaker. The bushing conductor is the primary, and several CTs may be stacked on one bushing for differential, overcurrent and metering duties.

Drawing use

SLD / Schematic

Application

Metering & protection

Reference family

IEC / IEEE / ANSI / Manufacturer

A distinction that matters

A bushing CT uses the bushing conductor as its primary; a free-standing CT has its own insulated primary.

Full referenceAdd to legend

CT

Symbols

Multi-core current transformer

A multi-core CT has one primary passing through two or more separate cores, each with its own secondary winding. Typical MV and HV CTs have one metering core and one or more protection cores, so the single-line diagram shows each core as its own ring on the primary with its ratio and class beside it.

Drawing use

SLD / Schematic

Application

Metering & protection

Reference family

IEC / Manufacturer

A distinction that matters

A multi-core CT has separate magnetic cores; a CT with two secondaries on a common core shares one magnetic circuit.

Full referenceAdd to legend

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.