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Tp1 Exemptions Acme-Products

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Information about Tp1 Exemptions Acme-Products
Technology

Published on March 7, 2014

Author: dartboard

Source: slideshare.net

Description

This slide show from the archive discusses TP1 Exemptions and Acme Products
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1 TP1 Exemptions and Acme Products Acme’s single phase general purpose products in 15 and 25 kva are epoxy encapsulated which makes them exempt from TP1. Even though they are exempt they have efficiencies in the 96% to 98% range. Three phase general purpose products in 15 kva are also epoxy encapsulated and therefore are exempt from TP1. These units have efficiencies in the 96% to 97% range. This explains why the Catalog numbers for these products did not change. K-rated transformers are required to meet the TP1 standard when tested at a K- factor of 1. (no harmonics)

2 Single Phase TP1 Efficiencies Kva % 15 97.7 25 98.0 37.5 98.2 50 98.3 75 98.5 100 98.6 167 98.7 250 98.9

3 Three Phase TP1 Efficiencies Kva % 15 97.0 30 97.5 45 97.7 75 98.0 112.5 98.2 150 98.3 225 98.5 300 98.6 500 98.7 750 98.8 1000 98.9

4 TP1 Basics TP1 efficiency is calculated at 35% of rated kva load. Total losses in a transformer are the sum of the No Load (core) losses and the I²R (conductor) losses. A typical 75 kva TP1 unit would have 300 watts no load loss and 2900 watts I²R loss for total losses of 3200 watts.

5 TP1 Basics cont’d At 35% load the I²R losses would only be 355 watts (0.35² X 2900). The total losses would now be 300 + 355 = 655 watts. As you can see the no load losses have become almost 46% of the total losses. As a result of this it is necessary to address the no load losses in a transformer design to successfully meet the TP1 efficiency requirement.

6 TP1 Basics cont’d This is part of the reason why TP1 transformers are more expensive since the core is typically the most expensive component in the transformer. Another reason for higher cost is the required testing on 100% of units produced. Units must be tested under load conditions. (Additional labor and energy cost)

6 TP1 Basics cont’d This is part of the reason why TP1 transformers are more expensive since the core is typically the most expensive component in the transformer. Another reason for higher cost is the required testing on 100% of units produced. Units must be tested under load conditions. (Additional labor and energy cost)

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