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What are the standard sizes of transformers?

by Ayden Rudd

What are the standard sizes of transformers?

Especially for commercial buildings, the most common sizes for transformers are the following:

  • 3 kVA.
  • 6 kVA.
  • 9 kVA.
  • 15 kVA.
  • 30 kVA.
  • 37.5 kVA.
  • 45 kVA.
  • 75 kVA.

How do you size a transformer?

How to Size a Transformer

  1. Transformer size is determined by the kVA of the load.
  2. Load voltage, or secondary voltage, is the voltage needed to operate the load.
  3. Line voltage, or primary voltage, is the voltage from the source.
  4. Single-Phase has two lines of AC power.

What is 750 kVA transformer?

3-Phase 750 kVA Distribution Transformer

Number of Phase 3-Phase
Voltage Ratio 11kV/433V
Cooling Type Oil Cooled
Winding Material Aluminium
Power 750 KVA

How much oil is in a 750 kVA transformer?

1-2. 33kV – 400/230V

Item Capacity Oil
kVA Liter
9 800 700
10 1,000 750
11 1,250 900

How much load can a 25 kVA transformer handle?

Three Phase Transformer

KVA 208V 2400V
20 56.6 4.82
25 69.5 6.02
30 83.4 7.23
37.5 104 9.03

How big is a 30 kVA transformer?

Specifications

height 27 in (685.80 mm)
Width 20 in (508.00 mm)
Depth 16 in (406.40 mm)
Net Weight 260.00 lb(US) (117.934 kg)

How do you select Transformers?

To select the proper transformer, determine the input and output voltages, frequency and current. The faster the voltage changes, the higher the frequency. The higher the current, the more heat is produced.

How many amps can a 750 kva transformer handle?

Three Phase Transformers, Full Load Amperes (FLC)
KVA 208V 480V
500 1387 601
750 2084 903
1000 2779 1204

How much oil does a 25 kva transformer take?

Product Specification

Voltage rating 11/.433KV
Connection DYn11
Dimension 1000 x 800 x 800 mm Overall +/- 10% Tolerance
Insulating Fluid Mineral Oil
Tank Capacity 145 L

How much load can a 50 kVA transformer handle?

Three Phase Transformer

KVA 208V 2400V
37.5 104 9.03
45 125 10.8
50 139 12.0
60 167 14.5

How many kVA does an average house use?

2 Answers from MyBuilder Electricians The average demand usually works out around 80-100 amps once diversity is taken no account, in a modern 3-4 bedroom home (18.4 – 23 kVA).

What is a 3kva transformer?

3 KVA 2 X 16 PTR Transformer is a trade rated portable transformer is used for stepping down UK mains voltage (240v) to 110V CTE (centre tap earthed) site safety supply. This step down transformer is commonly used for 110volt construction industry power tools, lighting and other site machinery. More Information.

Which is better oil or liquid filled transformers?

Liquid-filled and oil transformers tend to be the less expensive choice when used for outdoor applications. Also, while dry-type transformers have many advantages, they are limited by voltage rating and size. Liquid-filled transformers can handle much larger electrical loads and are available in higher voltage ratings as well.

What are the amps for a silicon filled transformer?

Nominal X 1.25 (or 1.15) 1.25 X FA Maximum amps for Oil/Silicon filled 65/55deg rise, fan rating Nominal X 1.12 X 1.25 (or 1.15) Maximum amps for Dry type, 150 deg rise, FA rating Nominal X 1.33 208 V Maximum amps for Dry type, 115 deg rise, FA rating Nominal X 1.15 X 1.33 Maximum amps for Dry type, 80 deg rise, FA rating Nominal X 1.30 X 1.33

What are the amps for a dry type transformer?

Maximum amps for Dry type, 80 deg rise, FA rating Nominal X 1.30 X 1.33 Maximum amps Oil filled Padmount, 55/65 deg rise Nominal X 1.12 Extended ratings formulas Liquid filled, 2500-10,000kVA Liquid filled, 750-2000kVA Fans = 125% Fans = 115% 55/65deg rise = 112% Dry type Padmount, 55/65 deg rise Fans = 133% At 65 deg rise = 112%

How to calculate the amps of a transformer?

Xfmr_Tables Nominal amperes at nameplate kVA, all transformer types kVA Volts Amps = kVA X Maximum amps for Oil/Silicon filled 65 deg, fan rating Nominal X 1.25 (or 1.15) 1.25 X FA Maximum amps for Oil/Silicon filled 65/55deg rise, fan rating Nominal X 1.12 X 1.25 (or 1.15)