# What is duration of drying out for 400 kv transformer?

## What is duration of drying out for 400 kv transformer?

insulation resistance. kVA,400 kVA,630 kVA,800 kVA). continued for 36 hours.

## Why transformer is used in kVA or MVA?

The real reason is that all AC sources (transformer or alternators) are rated in VA (or KVA or MVA) is because the power factor of current is decided by the load connected. And since the load power factor is not known (while the transformer is being manufactured), they are rated considering resistive load (PF = 1).

## When all additional clamping is removed from a transformer Mcq?

2. When all additional clamping is removed from a transformer? Explanation: When the tank is correctly positioned on the plinth it must then be carefully examined for any signs of damage or any other indication that it might have been mishandled during transport.

## Why transformer is kVA and motor in KW?

Transformers have copper losses and iron losses. Copper loss depends on current and iron loss depends on voltage. All AC devices that supply power, such as transformers, UPS, generators, etc are rated in kVA. Devices that consume power, have a kilowatt rating, because we know what its power factor is.

## How many MVA are in kVA?

Generally, kVA is the large unit of the apparent power. Sometimes we may use MVA, that is a very large unit of VA and it is 1000 times of kVA and 10,00,000 times of VA. For calculating kVA rating from VA we have used below formula. The Volt-Amp is divided by 1000 is equal to kilo Volt-Amp.

## How much power is lost in 315 MVA transformers?

The 315 MVA transformers step down the voltage from 400 KV to 220 KV. 6% of the input power 680 MW i.e. around 40 MW power is lost in the transformers. The rest i.e.640 MW is fed to the 220 KV busbar (double main and transfer bus scheme ). To increase the reliability of the system the 220 KV busbar is also fed from 2 other substations.

## What is the technical specification for a 500 MVA transformer?

TECHNICAL SPECIFICATION Sl. No. TITLE. 1.0 SCOPE. 60 2.0 Standards 61 3.0 Auxiliary Power Supply. 64 4.0 Principal Parameters. 65 5.0 General Technical Requirements. 69 5.1 Duty requirements. 69 5.2 Transformer Losses 71 5.3 Clearance.

## How much power is lost in a 400 kV power substation?

The remaining 680 MW is fed to three 315 MVA (3×105 MVA units) autotransformers working at an average 80% loading and 0.9 power factor. The 315 MVA transformers step down the voltage from 400 KV to 220 KV. 6% of the input power 680 MW i.e. around 40 MW power is lost in the transformers.

## How to calculate the voltage of a KVA transformer?

Transformer VA, kVA, MVA calculator: Resistance ( R ): ohms (Ω) kiloohms (kΩ) megaohms (MΩ) Current ( I ): microamps (μA) milliamps (mA) amps (A) k Voltage ( V ): microvolts (μV) millivolts (mV) volts (V Rating ( S ): micro VA (μVA) milliVA (mVA) VoltAmp (VA