Instrument transformer

<h2 id="current-transformer">Current transformer</h2>
<p class="note">Main article: <a href="/facts/Current_transformer/w5JaY0oc">Current transformer</a></p>

<p>Current transformers (CT)  are a series-connected type of instrument transformer. They are designed to present negligible load to the supply being measured and have an accurate current ratio and phase relationship to enable accurate secondary connected metering.
</p><p>Current transformers are often constructed by passing a single primary turn (either an <a href="/facts/Electrical_insulation/SfSXkrh5">insulated</a> cable or an uninsulated bus bar) through a well-insulated <a href="/facts/Torus/J9SkaV1W">toroidal</a> core wrapped with many turns of wire. This affords easy implementation on high voltage bushings of grid transformers and other devices by installing the secondary turn core inside high-voltage bushing insulators and using the pass-through conductor as a single turn primary.
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<p>A <a href="/facts/Current_clamp/M8ulfxCg">current clamp</a> uses a current transformer with a split core that can be easily wrapped around a conductor in a circuit.  This is a common method used in portable current measuring instruments but permanent installations use more economical types of the current transformer.
Specially constructed <a href="/facts/Wideband/wv1yPnkF">wideband</a> CTs are also used, usually with an <a href="/facts/Oscilloscope/HMdD8XVk">oscilloscope</a>, to measure <a href="/facts/High_frequency/JmDJLR5I">high frequency</a> <a href="/facts/Waveform/yAskMREw">waveforms</a> or pulsed currents within <a href="/facts/Pulsed_power/BTJN8xg5">pulsed power</a> systems. One type provides an IR voltage output that is proportional to the measured current; another, called a <a href="/facts/Rogowski_coil/J4U10EHc">Rogowski coil</a>, requires an external <a href="/facts/Integrator/VTqXQuQU">integrator</a> in order to provide a proportional output.
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<h3>Ratio</h3>
<p>The CT is typically described by its current ratio from primary to secondary. A 1000:5 CT will provide an output current of 5 amperes when 1000 amperes are flowing through its primary winding. Standard secondary current ratings are 5 amperes or 1 ampere, compatible with standard measuring instruments. It is used to step down current for metering purposes for the safety of the equipments as well as operator.
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<h3>Burden and accuracy</h3>
<p>Burden and accuracy are usually stated as a combined parameter due to being dependent on each other. 
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Metering style CTs are designed with smaller cores and VA capacities. This causes metering CTs to saturate at lower secondary voltages saving sensitive connected metering devices from damaging large fault currents in the event of a primary electrical fault. A CT with a rating of 0.3B0.6 would indicate with up to 0.6 ohms of secondary burden the secondary current will be within a 0.3 percent error parallelogram on an accuracy diagram incorporating both phase angle and ratio errors.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a>
Relaying CTs used for protective circuits are designed with larger cores and higher VA capacities to ensure secondary measuring devices have true representations with massive grid fault currents on primary circuits. A CT with a rating of 2.5L400 would indicate it can produce a secondary voltage to 400 volts with a secondary current of 100 amperes (20 times its rated 5-ampere rating) and still be within 2.5 amperes of true accuracy.
<p>Care must be taken that the secondary winding of a CT is not disconnected from its low-impedance load while current flows in the primary, as this may produce a dangerously high voltage across the open secondary (especially in a relaying type CT) and could permanently affect the accuracy of the transformer.
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<h3>Multi-ratio CT</h3>
<p>The secondary winding can be a single ratio or have several <a href="/facts/Tap_(transformer)/EYYfXWrF">tap</a> points to provide a range of ratios.
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<h2 id="voltage-transformer">Voltage transformer</h2>
<p class="note">Main article: <a href="/facts/Voltage_transformer/QIMoV35s">Voltage transformer</a></p>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"Measurement Canada Standard Dwg. No.3400 D3 Delta Connected CTs" (PDF). MEASUREMENT CANADA. Retrieved 12 December 2012. <a href="http://www.ic.gc.ca/eic/site/mc-mc.nsf/vwapj/S-E-08_AppendixA.pdf/$file/S-E-08_AppendixA.pdf#page=51" target="_blank">http://www.ic.gc.ca/eic/site/mc-mc.nsf/vwapj/S-E-08_AppendixA.pdf/$file/S-E-08_AppendixA.pdf#page=51</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"Limits of the 0.3 and 0.6 accuracy classes for measuring current transformers". Measurement Canada. Retrieved 18 April 2013. <a href="http://www.ic.gc.ca/eic/site/mc-mc.nsf/eng/lm00147.html#Appendix" target="_blank">http://www.ic.gc.ca/eic/site/mc-mc.nsf/eng/lm00147.html#Appendix</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
</ol>

Instrument transformer open-in-new

Instrument transformer