## How do you size a transformer?

To determine the required transformer VA, multiply the secondary voltage by the required amperes: For example, VA=Volts x Amperes or 28V x 1.2 amperes = 33.6 VA. To determine the maximum transformer current, divide the transformer VA by transformer secondary voltage.

## 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.

**What is transformer capacity?**

Capacity: Transformers are rated to carry a load, which is indicated by their kilovolt-amperes nameplate ratings at the rated output voltage and frequency. These are standard within the industry and include: 15, 30, 45, 75, 112.5, 150, 225, 300, 500, 750, and 1,000 kVA.

**Why transformer is measured in kVA not in kW?**

The copper and iron are the two types of losses that occur in the transformer. The copper loss depends on the current (ampere) flows through the windings of the transformer while the iron loss depends on the voltage (volts). i.e., the rating of the transformer is in kVA.

### How many amps is 30kva?

kVa To Amps Calculator: How To Convert kVa To Amps? (+3 Examples)

kVA (Apparent Power) | Voltage (220 V) | Amperage (A) |
---|---|---|

How many amps is 5 kVA? | 220 V | 22.73 Amps |

How many amps is 10 kVA? | 220 V | 45.45 Amps |

How many amps is 20 kVA? | 220 V | 90.91 Amps |

How many amps is 30 kVA? | 220 V | 136.36 Amps |

### What is a transformer ratio?

The turns ratio of a transformer is defined as the number of turns on its secondary divided by the number of turns on its primary.

**Which type of transformer is used in substation?**

The 132kV is the rating of the step-down transformer, which has a 132kV primary voltage. Generally, these transformers are employed in transmission type substations where the voltage has to be stepped-down to additional distribution.

**What do the specifications on a transformer mean?**

Volt-Ampere (VA) or kilovolt-amperes (kVA) rating

#### What is the general specification of a transformer?

There are numerous important specifications to identify when searching for power transformers. The specifications of power transformer include a maximum power rating, maximum secondary current rating, maximum voltage rating and o/p type. Power transformer specifications mainly include

#### What are the factors to be consider for specifying transformer?

– Temperature of surroundings – Humidity, – Chemicals – Dirt and dust on terminal plates and bushings – Oil levels in case of oil filled units – Overvoltages / overcurrents. – Load conditions – Surges in line – Lightening – Impurities in oil- oil needs to be purified at intervals

**What is type test of transformer?**

Type tests of transformer. To prove that the transformer meets the customer’s specifications and design expectations,the transformer has to go through different testing procedures in manufacturer premises.