# What are the standard sizes of transformers?

## What are the standard sizes of transformers?

Page Contents

- 1 What are the standard sizes of transformers?
- 2 How do you size a transformer?
- 3 How much load can a 25 kVA transformer handle?
- 4 How big is a 30 kVA transformer?
- 5 How much oil does a 25 kva transformer take?
- 6 How much load can a 50 kVA transformer handle?
- 7 Which is better oil or liquid filled transformers?
- 8 What are the amps for a silicon filled transformer?

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

- Transformer size is determined by the kVA of the load.
- Load voltage, or secondary voltage, is the voltage needed to operate the load.
- Line voltage, or primary voltage, is the voltage from the source.
- 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)