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Current Transformers

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About Current Transformers

Current transformers measure power flow and provide electrical inputs to power transformers and instruments. Current transformers produce either an alternating current or alternating voltage that is proportional to the measured current. There are two basic types of current transformers: wound and toroidal. Wound current transformers consist of an integral primary winding that is inserted in series with the conductor that carries the measured current. Toroidal or donut-shaped current transformers do not contain a primary winding. Instead, the wire that carries the current is threaded through a window in the toroidal transformer. 

Current transformers have many performance specifications, including primary current, secondary current, insulation voltage, accuracy, and burden. Primary current, the load of the current transformer, is the measured current. Secondary current is the range of current outputs. Insulation voltage represents the maximum insulation that current transformers provide when connected to a power source. Accuracy is the degree of certainty with which the measured current agrees with the ideal value. Burden is the maximum load that devices can support while operating within their accuracy ratings. Typically, burden is expressed in volt-amperes (VA), the product of the voltage applied to a circuit and the current. 

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Products & Services Related to Current Transformers

Instrument Transformers
Instrument transformers are used to step-down current or voltage to measurable values. They provide standardized, useable levels of current or voltage in a variety of power monitoring and measurement applications.

Other Topics You Might Be Interested In

  • Wound Primary Current Transformers
    Wound primary current transformers have primary windings that usually consist of more that one turn. Wound primary transformers have an internal primary winding and have no windows for the primary...
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  • Current Transformers
    Current transformers (CT's) provide a simple, inexpensive and yet accurate means of sensing current flow in power conductors. They are available in 3 basic configurations: Split Core CT's are...
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  • Determining Burden For Current Transformers
    If a Current Transformer (CT) reads low, then the secondary is probably overloaded. Burden is the load which may be imposed on a transformer secondary by cables and connected devices without causing...
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Engineering Web: Current Transformers

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KOLMA and IHDA Indoor type Cable Current Transformers...

SIMPSON ELECTRIC 01305 Transformer, Current, Out 0-5 A, In...
> Transformers > Current Transformers > Transformer, Current, Out 0-5 A, In 0-400 A </
See Grainger Industrial Supply Profile & Catalog
Electric current - Wikipedia, the free encyclopedia
Electric current From Wikipedia, the free encyclopedia
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Part Numbers for Current Transformers

Part # Distributor Manufacturer Product Category Description
CURRENT SENSE TRANSFORMER @ Mectronic TCS_4P Not Provided TCS_4P
TRANSFORMER CURRENT SENS netCOMPONENTS Not Provided Not Provided Not Provided
Amp range of PAVA83 is expandable to 5000A with current transformers HVAC PLUS Not Provided Not Provided Not Provided
Amp range of PAVA83-T is expandable to 5000A with current transformers HVAC PLUS Not Provided Not Provided Not Provided
TT 50-SD Digi-Key LEM USA Inc Transformers TRANSFORM CURRENT 50A SPLIT CORE

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