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<h1>Auto Transformer</h1>
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<p>A special form of transformer having one winding, a portion of which is common to both the primary and the secondary circuits. The current in the high-voltage circuit flows through the series and common winding (see illustration).</p>
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<img src="images/voltage.png" alt="voltage" class="img-fluid">
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<p>The current in the low-voltage circuit flows through the common winding and adds vectorially to the current in the high-voltage circuit to give the common winding current. Thus, an electrical connection exists between high-voltage and low-voltage winding. Because of this sharing of parts of the winding, an auto-transformer having the same kilovolt-ampere (kVA) output rating is generally smaller in weight and dimensions than a two-winding transformer. One possible disadvantage of auto-transformers is that the winding are not isolated from each other and that the auto-transformer provides no isolation of the primary and secondary circuits.</p>
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<img src="images/auto-transformers.png" class="img-fluid m-auto" alt="auto-transformers">
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</section>
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<h2 class="title">Construction</h2>
<ul class="ver-list mt-5">
<li>Core and coil assemblies are mounted on isolation pads to reduce noise.</li>
<li>Bolted coil terminations suitable for copper or aluminium cables.</li>
<li>Front & back covers are easily removable for service.</li>
<li>Up to IP42 steel enclosures are available with paint / powder coating having lifting and wheel arrangement. MS or Stainless Steel enclosures are optional.</li>
<li>CE Certified </li>
<li>Qualified to the seismic requirements</li>
<li>Copper (Cu) or Aluminium (Al) windings</li>
<li>Copper / Aluminium / GI grounding strap</li>
<li>Accessible mounting flanges with front/back slotted mounting holes make installation easier</li>
<li>100% Factory tested for shorts and coil integrity, current and loss, voltage, impedance and noise.</li>
<li>Clear, Comprehensive Documentation and labeling</li>
<li>With more severe requirements on test voltages and creep age distance and clearance in air because these transformers are often exposed to over voltage.</li>
<li>Input-side matching taps.</li>
<li>Connections to safe-to-touch screw / screw less terminals in accordance with IEC61558 / IEC60076 </li>
<li>Additional clamp type terminal on request.</li>
<li>High-grade, vacuum impregnation in polyester impregnating resin.</li>
<li>Special versions available on request.</li>
</ul>
</div>
<h1 class="mt-5">Applications</h1>
<p>Auto transformers are used in applications where electrical isolation is not a critical requirement. When the ratio V2 : V1 is 0.3 or more they are used with advantage. The normal applications are motor starters & booster.</p>
<h3>These are used in:</h3>
<ul class="hor-list">
<li>Voltage Stabilizers, Dimmers, Motor Starters, conversion between different system voltage like Indian to US of UK system voltages Etc.</li>
</ul>
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<h2 class="title">Specification</h2>
<ul class="row-box spec-list spec-half mt-5">
<li class="br-b">
<p>Output VA range</p>
<h4>0.5KVA to 5000KVA</h4>
</li>
<li class="br-l br-b">
<p>Input voltage</p>
<h4>Max. 750V</h4>
</li>
<li class="br-l br-b">
<p>Output voltage</p>
<h4>Max. 750V</h4>
</li>
<li class="br-b">
<p>Frequency</p>
<h4>50 / 60 Hz</h4>
</li>
<li class="br-l br-b">
<p>Vector group</p>
<h4>Yn0</h4>
</li>
<li class="br-l br-b">
<p>Protection index</p>
<h4>IP00 max IP23 ( Other Available on special Request )</h4>
</li>
<li class="">
<p>Insulation class</p>
<h4>F / H</h4>
</li>
<li class="br-l">
<p>Ambient temperature</p>
<h4>Max. 50 Degc</h4>
</li>
<li class="br-l">
<p>Efficiency</p>
<h4>90 to 99 % ( over a range of capacity)</h4>
</li>
<li class="br-l">
<p>Reference Standards</p>
<h4>IEC61558-2-2 /IEC60076 / IS2026 / IS11171</h4>
</li>
</ul>
</div>
</div>
<div class="row-box mt-5">
<img src="images/dimensional.png" class="img-fluid m-auto">
<h4 class="text-center mt-4">Always specify the Required KVA, highest voltage & lowest voltage rating in your order/ Requirement.</h4>
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</section>
<section class="padding-sm text-center">
<div class="container">
<div class="table-responsive">
<table class="table table-striped table-sm table-bordered">
<thead>
<tr>
<th>Design KVA</th>
<th>Length</th>
<th>Width</th>
<th>Height</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>180</td><td>125</td><td>200</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>121</td><td>240</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>120</td><td>240</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>135</td><td>240</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>145</td><td>240</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>150</td><td>300</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>160</td><td>300</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>170</td><td>300</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>180</td><td>300</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>200</td><td>360</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>210</td><td>360</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>210</td><td>360</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>215</td><td>360</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>215</td><td>360</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>250</td><td>420</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>260</td><td>420</td><td>220</td><td>180</td><td>13X28</td><td>127</td><td>A</td></tr>
<tr><td>25</td><td>480</td><td>285</td><td>460</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>315</td><td>520</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>315</td><td>520</td><td>220</td><td>205</td><td>13X28</td><td>222</td><td>A</td></tr>
<tr><td>40</td><td>550</td><td>320</td><td>550</td><td>220</td><td>210</td><td>13X28</td><td>232</td><td>A</td></tr>
<tr><td>45</td><td>550</td><td>350</td><td>550</td><td>220</td><td>210</td><td>13X28</td><td>261</td><td>A</td></tr>
<tr><td>50</td><td>550</td><td>400</td><td>550</td><td>220</td><td>265</td><td>13X28</td><td>260</td><td>A</td></tr>
<tr><td>60</td><td>600</td><td>400</td><td>600</td><td>400</td><td>270</td><td>17x35</td><td>285</td><td>B</td></tr>
<tr><td>75</td><td>600</td><td>500</td><td>600</td><td>400</td><td>265</td><td>17x35</td><td>329</td><td>B</td></tr>
<tr><td>100</td><td>600</td><td>500</td><td>600</td><td>400</td><td>270</td><td>17x35</td><td>400</td><td>B</td></tr>
<tr><td>125</td><td>750</td><td>450</td><td>700</td><td>400</td><td>240</td><td>17x35</td><td>500</td><td>B</td></tr>
<tr><td>150</td><td>750</td><td>450</td><td>700</td><td>400</td><td>240</td><td>17x35</td><td>550</td><td>B</td></tr>
<tr><td>200</td><td>1050</td><td>500</td><td>950</td><td>300-300</td><td>400</td><td>17x35</td><td>750</td><td>C</td></tr>
<tr><td>250</td><td>1200</td><td>500</td><td>950</td><td>350-350</td><td>400</td><td>17x35</td><td>825</td><td>C</td></tr>
<tr><td>300</td><td>1200</td><td>500</td><td>950</td><td>350-350</td><td>400</td><td>17x35</td><td>900</td><td>C</td></tr>
<tr><td>400</td><td>1250</td><td>600</td><td>1050</td><td>400-400</td><td>400</td><td>17x35</td><td>1200</td><td>C</td></tr>
<tr><td>500</td><td>1400</td><td>600</td><td>1050</td><td>400-400</td><td>500</td><td>17x35</td><td>1450</td><td>C</td></tr>
</tbody>
</table>
</div>
<p class="mt-4 mb-0 text-left"><b>Note:</b> </p>
<p class="text-left">For higher rating contact us for more details. Dimension may change at the time of final design.</p>
<hr>
<h3>Figure For Type :- A</h3>
<img class="img-fluid m-auto" src="images/auto-figure-a.jpg" alt="Figure For Type : A">
<h3 class="mt-4">Figure For Type :- B</h3>
<img class="img-fluid m-auto" src="images/auto-figure-b.jpg" alt="Figure For Type : B">
<h3 class="mt-4">Figure For Type :- C</h3>
<img class="img-fluid m-auto" src="images/auto-figure-c.jpg" alt="Figure For Type : C">
</div>
</section>
<section class="padding-sm gray-bg">
<div class="container">
<h1>Motor Starting Applications</h1>
<h2>Three Phase Motor Starting Auto Transformers </h2>
<p>PRIMA motor starting auto transformers have been an industry standard for many years.
Auto transformers are a significant component of a motor controller. In its simplest form, motor starters start and stop a motor and protect against over voltage and under voltage. In most applications, a simple full-voltage magnetic starter places full voltage across the motor’s winding on startup and maintains full voltage at the motor during the run mode. For larger motors, or motors where the load is connected, the effect of motor-starting inrush can stress the electrical system with significantly lower currents in the distribution network. This can cause all manner of disruption to the system with subsequent interruption in the facility. In these cases, reduced-voltage starting must be applied. The addition of a motor starting auto transformer during the startup sequence limits the starting inrush current. The PRIMA 3P product line is designed for Medium Duty service including applications for drive loads such as pumps, compressors, conveners and fans.
</p>
<p>PRIMA 3P Motor Starting Auto transformer: Three phase, 3 coil, suitable for motor starters with 3 contacts, connected in a three phase ‘Wye’ configuration. This provides balanced voltages across each phase. </p>
<p>Special Motor Starting Auto transformers. For applications requiring heavy duty service with frequent starts or jogging, high inertia loads such as paper or steel mill drives, medium voltage or other unusual demands, </p>
<p>PRIMA can offer specially designed units to meet your requirements. Please consult our sales offices.</p>
<div class="row-box white-box">
<h2 class="title">Specification</h2>
<ul class="row-box spec-list spec-half mt-5">
<li class="br-b">
<p>Output VA range</p>
<h4>5HP to 1000HP</h4>
</li>
<li class="br-l br-b">
<p>Input voltage</p>
<h4>Max. 750V</h4>
</li>
<li class="br-l br-b">
<p>Output voltage</p>
<h4>Max. 750V</h4>
</li>
<li class="br-b">
<p>Frequency</p>
<h4>50 / 60 Hz</h4>
</li>
<li class="br-l br-b">
<p>Vector group</p>
<h4>Yn0</h4>
</li>
<li class="br-l br-b">
<p>Protection index</p>
<h4>IP00 max IP23 ( Other Available on special Request )</h4>
</li>
<li class="">
<p>Insulation class</p>
<h4>F / H</h4>
</li>
<li class="br-l">
<p>Ambient temperature</p>
<h4>Max. 50 Degc</h4>
</li>
<li class="br-l">
<p>Starts per Hour</p>
<h4>6 Starts ( Other available on request)</h4>
</li>
<li class="br-l">
<p>Time duration</p>
<h4>15 Seconds (Other available on request)</h4>
</li>
<li class="br-l">
<p>Tapping</p>
<h4>60% 70% 80% 100% (Special Configuration available on request )</h4>
</li>
<li class="br-l">
<p>Reference Standards</p>
<h4>IEC61558-2-2 /IEC60076 / IS2026 / IS11171</h4>
</li>
</ul>
</div>
</div>
</section>
<section class="padding-sm">
<div class="container">
<div class="table-responsive">
<table class="table table-striped table-sm table-bordered t-w-auto mt-2">
<thead>
<tr>
<th>HP</th>
<th>L</th>
<th>W</th>
<th>H</th>
<th>X</th>
<th>Y</th>
</tr>
</thead>
<tbody>
<tr><td>10</td><td>205</td><td>150</td><td>240</td><td>165</td><td>75</td></tr>
<tr><td>15</td><td>205</td><td>160</td><td>240</td><td>165</td><td>92</td></tr>
<tr><td>20</td><td>205</td><td>165</td><td>240</td><td>165</td><td>102</td></tr>
<tr><td>25</td><td>310</td><td>170</td><td>245</td><td>255</td><td>92</td></tr>
<tr><td>30</td><td>315</td><td>170</td><td>245</td><td>255</td><td>92</td></tr>
<tr><td>35</td><td>310</td><td>175</td><td>240</td><td>255</td><td>105</td></tr>
<tr><td>40</td><td>310</td><td>185</td><td>240</td><td>255</td><td>105</td></tr>
<tr><td>45</td><td>310</td><td>200</td><td>245</td><td>255</td><td>120</td></tr>
<tr><td>55</td><td>310</td><td>220</td><td>255</td><td>255</td><td>135</td></tr>
<tr><td>60</td><td>310</td><td>230</td><td>285</td><td>255</td><td>130</td></tr>
<tr><td>90</td><td>365</td><td>240</td><td>385</td><td>300</td><td>140</td></tr>
<tr><td>100</td><td>365</td><td>240</td><td>385</td><td>300</td><td>160</td></tr>
<tr><td>150</td><td>365</td><td>240</td><td>385</td><td>300</td><td>165</td></tr>
</tbody>
</table>
</div>
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