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<title>Prima Transformers Pvt.Ltd.</title>
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<h1>Power Transformers</h1>
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<h1 class="mb-4">3phase power transformers</h1>
<h2>3 Phase Electrical Power Isolation Transformer</h2>
<p>A 3 phase transformer, there is a three-legged iron core as shown below. Each leg has a
respective primary and secondary winding. Thus a 3 phase isolation transformers is a 3 phase transformer which has isolated primary and secondary windings to allow the power input to be isolated from the power output.</p>
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<img src="images/power.png" class="img-fluid m-auto" alt="Transformer">
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<h2>Standard 3 Phase Isolation Transformers</h2>
<p>3 phase isolation transformers have 3 primary and 3 secondary windings that are physically
separated from each other. Sometimes these isolation transformers are referred to as "insulated". This is because the windings are insulated from each other.</p>
<p>In a 3 phase isolation transformer the output windings will be isolated, or floating from earth ground unless bonded at the time of installation.</p>
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<h2>3 Phase Transformers Overview</h2>
<p>3 phase transformers are used throughout industry to change values of 3 phase voltage and
current. Since 3 phase power is the most common way in which power is produced, transmitted, an used, an understanding of how 3 phase transformer connections are made is essential. In this section it will discuss different types of 3 phase transformers connections, and present examples of how values of voltage and current for these connections are computed.</p>
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<h2>3 phase Transformer Construction:</h2>
<p>A 3 phase transformer is constructed by winding three single phase transformers on a single core. These transformers are put into an enclosure which is then filled with dielectric oil. The dielectric oil performs several functions. Since it is a dielectric, a nonconductor of electricity, it provides electrical insulation between the windings and the case. It is also used to help provide cooling and to prevent the formation of moisture, which can deteriorate the winding insulation.</p>
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<img src="images/power-transformers.png" class="img-fluid m-auto" alt="power-transformers">
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</section>
<section class="padding appl-sec gray-bg mar-in">
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<h1>Applications</h1>
<p>To supply electrical consumers of all kinds, e.g. measuring and control instruments, power electronic modules, etc.. Customized specification and dimensions ensureoptimal application.</p>
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<h2 class="title">Specification</h2>
<ul class="row-box spec-list mt-5">
<li class="br-b">
<p>Output range</p>
<h4>250 VA – 1000 kVA</h4>
</li>
<li class="br-l br-b">
<p>Input voltage max.</p>
<h4>750 V</h4>
</li>
<li class="br-l br-b">
<p>Output voltage max.</p>
<h4>750 V</h4>
</li>
<li class="br-b">
<p>Output current at max.</p>
<h4>65 A</h4>
</li>
<li class="br-l br-b">
<p>Screw terminals max.</p>
<h4>135 A</h4>
</li>
<li class="br-l br-b">
<p>Studs max.</p>
<h4>450 A</h4>
</li>
<li class="br-b">
<p>Flat termination max.</p>
<h4>1500 A</h4>
</li>
<li class="br-l br-b">
<p>Frequency</p>
<h4>50-60 Hz</h4>
</li>
<li class="br-l br-b">
<p>Vector group</p>
<h4>DYN11</h4>
</li>
<li class="">
<p>Protection index</p>
<h4>IP 00</h4>
</li>
<li class="br-l">
<p>Insulation class</p>
<h4>B/F</h4>
</li>
<li class="br-l">
<p>Ambient temperature max.</p>
<h4>40° C</h4>
</li>
</ul>
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<h2 class="title">Construction</h2>
<ul class="ver-list mt-5">
<li>Open construction (IP 00, incorporation up to max. IP 23)</li>
<li>Separated winding</li>
<li>Resting on U sections</li>
<li>Connections to safe-to-touch screw terminals in accordance with CE (higher current ratings to studs or flat termination with bolt & shrouding)</li>
<li>High-grade, vacuum-pressure impregnation in polyester impregnating resin</li>
<li>Special versions available on request up to 1000KVA</li>
</ul>
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<section class="padding text-center">
<div class="container">
<h1>Applicable standards</h1>
<p>IS 2026, IS 11171, IS 12012</p>
<img class="img-fluid m-auto" src="images/power-transformers-graph.png" alt="power-transformers-graph">
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<table class="table table-striped table-sm table-bordered mt-5">
<thead>
<tr>
<th>KVA</th>
<th>HEIGHT</th>
<th>WIDTH</th>
<th>DEPTH</th>
<th>X</th>
<th>Y</th>
<th>SLOT</th>
<th>WEIGHT</th>
<th>Figure</th>
</tr>
</thead>
<tbody>
<tr>
<td>0.5</td>
<td>200</td>
<td>180</td>
<td>125</td>
<td>160</td>
<td>90</td>
<td>8X20</td>
<td>11</td>
<td>A</td>
</tr>
<tr>
<td>0.75</td>
<td>240</td>
<td>240</td>
<td>121</td>
<td>160</td>
<td>75</td>
<td>8X20</td>
<td>13</td>
<td>A</td>
</tr>
<tr>
<td>1</td>
<td>240</td>
<td>240</td>
<td>120</td>
<td>160</td>
<td>75</td>
<td>8X20</td>
<td>14</td>
<td>A</td>
</tr>
<tr>
<td>1.25</td>
<td>240</td>
<td>240</td>
<td>135</td>
<td>160</td>
<td>90</td>
<td>8X20</td>
<td>19</td>
<td>A</td>
</tr>
<tr>
<td>1.5</td>
<td>240</td>
<td>240</td>
<td>145</td>
<td>160</td>
<td>100</td>
<td>8X20</td>
<td>21</td>
<td>A</td>
</tr>
<tr>
<td>2</td>
<td>300</td>
<td>300</td>
<td>150</td>
<td>180</td>
<td>90</td>
<td>10X25</td>
<td>26</td>
<td>A</td>
</tr>
<tr>
<td>2.5</td>
<td>300</td>
<td>300</td>
<td>160</td>
<td>180</td>
<td>100</td>
<td>10X25</td>
<td>30</td>
<td>A</td>
</tr>
<tr>
<td>3</td>
<td>300</td>
<td>300</td>
<td>170</td>
<td>180</td>
<td>110</td>
<td>10X25</td>
<td>34</td>
<td>A</td>
</tr>
<tr>
<td>4</td>
<td>300</td>
<td>300</td>
<td>180</td>
<td>180</td>
<td>120</td>
<td>10X25</td>
<td>41</td>
<td>A</td>
</tr>
<tr>
<td>5</td>
<td>360</td>
<td>360</td>
<td>200</td>
<td>200</td>
<td>135</td>
<td>13X28</td>
<td>53</td>
<td>A</td>
</tr>
<tr>
<td>6</td>
<td>360</td>
<td>360</td>
<td>210</td>
<td>200</td>
<td>145</td>
<td>13X28</td>
<td>61</td>
<td>A</td>
</tr>
<tr>
<td>7.5</td>
<td>360</td>
<td>360</td>
<td>210</td>
<td>200</td>
<td>145</td>
<td>13X28</td>
<td>65</td>
<td>A</td>
</tr>
<tr>
<td>10</td>
<td>360</td>
<td>360</td>
<td>215</td>
<td>200</td>
<td>150</td>
<td>13X28</td>
<td>72</td>
<td>A</td>
</tr>
<tr>
<td>12.5</td>
<td>360</td>
<td>360</td>
<td>215</td>
<td>200</td>
<td>150</td>
<td>13X28</td>
<td>83</td>
<td>A</td>
</tr>
<tr>
<td>16</td>
<td>420</td>
<td>420</td>
<td>250</td>
<td>220</td>
<td>170</td>
<td>13X28</td>
<td>110</td>
<td>A</td>
</tr>
<tr>
<td>20</td>
<td>420</td>
<td>420</td>
<td>260</td>
<td>220</td>
<td>180</td>
<td>13X28</td>
<td>127</td>
<td>A</td>
</tr>
<tr>
<td>25</td>
<td>460</td>
<td>480</td>
<td>285</td>
<td>220</td>
<td>200</td>
<td>13X28</td>
<td>161</td>
<td>A</td>
</tr>
<tr>
<td>30</td>
<td>520</td>
<td>520</td>
<td>315</td>
<td>220</td>
<td>200</td>
<td>13X28</td>
<td>201</td>
<td>A</td>
</tr>
<tr>
<td>35</td>
<td>520</td>
<td>520</td>
<td>315</td>
<td>220</td>
<td>205</td>
<td>13X28</td>
<td>222</td>
<td>A</td>
</tr>
<tr>
<td>40</td>
<td>520</td>
<td>520</td>
<td>320</td>
<td>220</td>
<td>210</td>
<td>13X28</td>
<td>232</td>
<td>A</td>
</tr>
<tr>
<td>45</td>
<td>580</td>
<td>560</td>
<td>335</td>
<td>220</td>
<td>205</td>
<td>13X28</td>
<td>261</td>
<td>A</td>
</tr>
<tr>
<td>50</td>
<td>505</td>
<td>840</td>
<td>500</td>
<td>250</td>
<td>265</td>
<td>15x35</td>
<td>260</td>
<td>B</td>
</tr>
<tr>
<td>60</td>
<td>505</td>
<td>860</td>
<td>500</td>
<td>250</td>
<td>270</td>
<td>15x35</td>
<td>285</td>
<td>B</td>
</tr>
<tr>
<td>75</td>
<td>550</td>
<td>875</td>
<td>500</td>
<td>250</td>
<td>265</td>
<td>15x35</td>
<td>329</td>
<td>B</td>
</tr>
<tr>
<td>100</td>
<td>560</td>
<td>900</td>
<td>520</td>
<td>250</td>
<td>270</td>
<td>15x35</td>
<td>384</td>
<td>B</td>
</tr>
<tr>
<td>125</td>
<td>595</td>
<td>960</td>
<td>550</td>
<td>250</td>
<td>280</td>
<td>15x35</td>
<td>483</td>
<td>B</td>
</tr>
<tr>
<td>150</td>
<td>635</td>
<td>1010</td>
<td>570</td>
<td>250</td>
<td>290</td>
<td>15x35</td>
<td>548</td>
<td>B</td>
</tr>
</tbody>
</table>
</div>
</div>
</section>
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