Transformer Ratings List

March 09, 2024 Post a Comment

Transformer ratings list

Industry standard sizes for 480- to 120/208-volt wye transformers are commonly 15, 30, 45, 75, 112.5, 225, 300 and 500 kilovolt-amperes. There are also single-phase 277-or 480-volt transformer sizes available at 5, 7.5, 10, 15, 25, 37.5, 50, 75 and 100 kilovolt-amperes.

What is the rating of 11kV transformer?

The standard ratings shall be 16, 25, 63, 100,160, 200, 250, 315, 400, 500, 630, 1000, 1250, 1600, 2000 and 2500 kVA for 11 kV distribution transformers and 100, 160, 200, 315, 400, 500, 630, 1000, 1250, 1600,2000, 2500 kVA for 33 kV distribution transformers.

What are the 5 types of transformers?

Types of Transformers

Power Transformers. A power transformer transfers electricity between a generator and the distribution primary circuits.
Autotransformers. Now, let's make things even more complicated. ...
Generator Step-Up Transformers. Moving right along to GSUs or generator step-up transformers. ...
Auxiliary Transformers.

Why transformer is rated in VA or kVA or MVA?

As, the copper loss or I2R loss depends on the current and the iron or core loss depends upon the voltage of the transformer. Thus, the total losses in a transformer depend upon volt-ampere (VA) only and not on the power factor of the load. That is why the transformer rating is given in kVA and not in kW.

What is meant by 11kV transformer?

The 11kV lines are used in residential areas and is what feeds the local transformers, which then distributes power to the buildings in the area. 33kV lines on the other hand involve much higher voltages and are used to distribute power from one small sub-station to another.

What is the difference between kVA and KV?

KV is the voltage. KVA is the product of the voltage and the current. kVA= KV* Amp. KVA is known as the apparent power.

What is kVA rating?

The kVA unit represents kilovolt-amperes, or 1,000 volt-amperes. A transformer with a 1.0 kVA rating is the same as a transformer with a 1,000 VA rating and can handle 100 volts at 10 amps of current.

What is the BDV value of transformer?

A typical value of BDV Test result for 220 / 6.6 kV Transformer oil is 65 kV and moisture content should be less than 10 ppm. BDV is an important and popular test of transformer oil, as it is the primary indicator of the health of oil and it can be easily carried out at the site.

What is 11kV in kVA?

In simple words, Transformer rating in kVA = 100 kVA. Primary Voltages = 11000 = 11kV. Primary Current = 5.25 A. Secondary Voltages = 415V.

What is ISO transformer?

An isolation transformer is a transformer used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons or to reduce transients and harmonics.

What are the 3 types of transformers?

Depending on the Power rating and specification, Power transformers can further be classified into three categories: Small power transformer, Medium Power transformers, and the Large power transformers.

How many types of transformers are there in kVA?

The different types of transformer are Step up and Step down Transformer, Power Transformer, Distribution Transformer, Instrument transformer comprising current and Potential Transformer, Single phase and Three phase transformer, Auto transformer, etc. Contents: Step up and Stepdown Transformer.

What is MVA capacity?

MVA means megavolt-amperes. The capacity of larger transformers is normally measured in terms of megavolt-amperes, where one MVA is one million volt-amperes.

What is kVA to kW?

P (power) = I (current) × V (voltage) That means that in DC circuits, 1 kVA is equal to 1 kW. That means that 1 kVA is equal to 1,000 watts. In alternating current (AC) circuits, where kVA to kW conversion is mostly used, the kVA to kW conversion depends on the power factor (PF).

How do you convert MVA to kVA?

1 Megavolt-Amperes (MVA) is equal to 1000 Kilovolt-Amperes (kVA).

Why 11KV 22kV 33KV 66kV 132kV?

Sending Voltage	Receiving Voltage
20kV x 10% = 22kV	20kV
30kV x 10% = 33kV	30kV
60kV x 10% = 66kV	60kV
120kV x 10% = 132kV	120kV

What is the height of 33KV pole?

It considers a three-phase stout class wood pole overhead distribution line, having a pole height of 9m and an average span length of 90m.

What is HT line and LT line?

Tension is a French word for voltage that comprises the two terms LT and HT. A low tension line simply means low voltage and a high tension line simply means high voltage. If you have a three-phase connection you receive an LT supply of 400 volts. For a single connection, you will receive 230 volts.

What KVAR means?

Kilovolt-amperes reactive, thousand Volt-ampere reactive, a unit of reactive power.

Which is higher kVA or kW?

kW denotes the unit of real power and kVA denotes the unit of apparent power. The power factor, which is defined and known, is, therefore, an approximate value (typically 0.8), and in the kW to kVA calculations, kVA value will always be more than the kW value.