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<title>Prima Transformers Pvt.Ltd.</title>
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<h1>Current Transformer</h1>
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<p>A current transformer is defined as "as an instrument transformer in which the
secondary current is substantially proportional to the primary current (under
normal conditions of operation) and differs in phase from it by an angle which is
approximately zero for an appropriate direction of the connections." This
highlights the accuracy requirement of the current transformer but also important
is the isolating function, which means no matter what the system voltage the
secondary circuit need be insulated only for a low voltage.</p>
<p>The current transformer works on the principle of variable flux. In the "ideal"
current transformer, secondary current would be exactly equal (when multiplied
by the turns ratio) and opposite to the primary current. But, as in the voltage
transformer, some of the primary current or the primary ampere-turns is utilized
for magnetizing the core, thus leaving less than the actual primary ampere turns
to be "transformed" into the secondary ampere-turns. This naturally introduces
an error in the transformation. The error is classified into two-the current or ratio
error and the phase error.</p>
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<img src="images/current-transformers.png" class="img-fluid m-auto" alt="Current Transformers">
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<h2 class="title">Features:</h2>
<ul class="ver-list mt-5">
<li>The Current transformers are Tape wound / Abs Enclouser / Cast resin potted .</li>
<li>High quality C.R.G.O. silicon steel is used in the transformer.</li>
<li>High quality insulating paper is used to build up main insulation.</li>
<li>Smaller, Lighter and more accurate.</li>
<li>Turns Ratio and phase angle, with in guaranteed limits of standards.</li>
<li>Reliable, rugged and cost effective.</li>
<li>Customers specified design.</li>
<li>Standard CT Manufacturing Up to class 0.1</li>
</ul>
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<h2 class="title">Specifications:</h2>
<ul class="ver-list mt-5">
<li>To step down line current to a
value which is suitable for
standard measuring instrument,
relays etc.</li>
<li>To sense abnormalities in current
and give current signals to
protective relays to isolate the
defective system. 3.3KV, Metering
(0.5 to 3.0) Protection (5P- 10P)</li>
<li>Continuous thermal current (Ith):
1.2 times rated current.</li>
<li>Short time Pri. Current: Min 30
times rated primary current.</li>
<li>ISF: Less than 5.</li>
<li>Temp. Rise: Less than 30˚C.</li>
<li>Insulation Level: 0.66KV / 3KV</li>
<li>Class of Insulation: E OR B</li>
<li>Rated Burden: 2.5VA to 30VA&
More</li>
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<ul class="row-box spec-list spec-half">
<li class="br-b">
<p>Type</p>
<h4>A) Measuring type.</h4>
<h4>B) Protection type.</h4>
<h4>C) Special Protection type. (PS Class)</h4>
<h4>D) Combination of any of above with two or three cores.</h4>
</li>
<li class="br-l br-b">
<p>Operating Voltage</p>
<h4>3.3kV, Maximum</h4>
</li>
<li class="br-l br-b">
<p>Operating temperature</p>
<h4>-10°C to 50°C</h4>
</li>
<li class="br-b">
<p>Conforms to</p>
<h4>IS - 2705.</h4>
</li>
<li class="br-l br-b">
<p>3.3kV,</p>
<h4>Up to 2500 Amps.</h4>
</li>
<li class="br-l br-b">
<p>Secondary Current</p>
<h4>5A & 1A (Others on Request)</h4>
</li>
<li class="br-b">
<p>Short time thermal current & its duration</p>
<h4>Up to 40kA for 1 second (Others on request)</h4>
</li>
<li class="br-l br-b">
<p>Rated burden</p>
<h4>5, 10, 15, 20, 30VA (Others on request)</h4>
</li>
<li class="br-l br-b">
<p>Frequency</p>
<h4>50Hz</h4>
</li>
<li class="br-b">
<p>Accuracy class</p>
<h4>Class 0.5,1 / protective 5P - 10P</h4>
</li>
<li class="br-l br-b">
<p>Core</p>
<h4>Single as well as multi core CT available as per requirement</h4>
</li>
</ul>
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<h2>Application:</h2>
<ul class="ver-list mt-1">
<li>3 CT Block for Trivector meters.</li>
<li>Accurate measuring for Metering / WATT / VAR.</li>
<li>Current Sensing, recording, monitoring and control.</li>
<li>Control panels & Drives.</li>
<li>Standard CT used as measuring standard for comparison.</li>
<li>Winding Temperature Indicator (WTI) for Power Transformers.</li>
</ul>
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<div class="col-md-12 col-lg-6">
<h2>Information Requied With Inquiry:</h2>
<ul class="ver-list mt-1">
<li>Ratio.</li>
<li>Burden.</li>
<li>Accuracy class.</li>
<li>ID / Dimension</li>
<li>Bar / Wound Type.</li>
<li>Short time current rating if any.</li>
<li>Mounting Specifications.</li>
<li>Instrument Safety Factor (ISF)</li>
</ul>
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<h2 class="title">Note:</h2>
<ul class="ver-list mt-5">
<li>Customer Specification accepted</li>
<li>Due to continue up gradation, above specifications are subject to change.</li>
<li>The Data presented is general information and should not be considered as
a limited OR guaranteed.</li>
<li>1 Amp. Secondary is also standard.</li>
<li>Customer specified designs include other secondary current, burden,
accuracy and Size.</li>
<li>Wide range available for wound / Bar Primary and many type of windings
possible.</li>
</ul>
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