Some early RCDs were entirely electromechanical and relied on finely balanced sprung over-centre mechanisms driven directly from the current transformer.
22.
A permanently installed current transformer ( CT ) fixed around the neutral leg feeder to the LNER senses the current.
23.
This is a common method used in portable current measuring instruments but permanent installations use more economical types of current transformer.
24.
The primary'winding'may be a permanent part of the current transformer, with a heavy copper bar to carry current through the core.
25.
A current clamp uses a current transformer with a split core that can be easily wrapped around a conductor in a circuit.
26.
Current transformers are often constructed by passing a single primary turn ( either an tap points to provide a range of ratios.
27.
How can I calculate the burden in Current Transformer ? Preceding contribs ) 08 : 47, 20 September 2008 ( UTC)
28.
Current transformers are often constructed by passing a single primary turn ( either an toroidal core wrapped with many turns of wire.
29.
Split-core current transformers are typically used in low current measuring instruments, often portable, battery-operated, and hand-held ( see illustration lower right ).
30.
Typically current transformers consist of a silicon steel ring core wound with many turns of copper wire as shown in the right illustration.
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