How is MVA base calculated?

Fault MVA at Motor Control Panel = Base MVA / Z Pu-a. Fault MVA at Motor Control Panel = 2.5 / 0.27317. Fault MVA at Motor Control Panel = 9 MVA. Fault Current = Fault MVA / Base KV.

What is base MVA?

Base quantities The base power may be the rating of a single piece of apparatus such as a motor or generator. If a system is being studied, the base power is usually chosen as a convenient round number such as 10 MVA or 100 MVA. The base voltage is chosen as the nominal rated voltage of the system.

How do you calculate base KVA?

Use the formula: P(KVA) = (V^2/R)/1000 where R is resistance in ohms. For example, if V is 120 volts and R is 50 ohms, P(KVA) = V^2/R/1000 = (14400/50)/1000 = 288/1000 = 0.288 KVA.

How do you convert MVA to amps?

Therefore, it takes 1,000 kilo-volt amperes to get one mega-volt ampere. Divide the number of kVA by 1,000 to convert to MVA. For example, if you have 438 kVA, divide 438 by 1,000 to get 0.438 MVA. Multiply the number of kVA by 0.001 to convert to MVA.

What is base value?

Basis value is the price of a fixed asset for taxation purposes. A fixed asset’s value can be adjusted to help companies take advantage of tax benefits as outlined by the Internal Revenue Service (IRS). In other words, the basis value helps reduce a company’s tax burden on the asset when the asset is sold.

How do we choose base quantities?

From the large number of possible quantities, constituting the ISQ (International System of Quantities—Système International de Grandeurs–), entry 1.6 in [1], seven specific ones have been selected as ‘base quantities’ by convention [2], assumed independent from each other: length, mass, time, electric current.

How to calculate base kVA for HT side?

Let’s first consider Base KVA and KV for HT and LT Side. Base KVA for HT side (H.T. Breaker and Transformer Primary) is 6 MVA Base KV for HT side (H.T. Breaker and Transformer Primary) is 6.6 KV Base KVA for LT side (Transformer Secondary and down Stream) is 2.5 MVA

What is the base kVA of a HT breaker?

Base KV for HT side (H.T. Breaker and Transformer Primary) is 6.6 KV Base KVA for LT side (Transformer Secondary and down Stream) is 2.5 MVA Base KV for LT side (Transformer Secondary and down Stream) is 415V

How to calculate the base kVA of a transformer?

Fault MVA at Primary side of Transformer = Base MVA / Z Pu-b. Fault Current = 290 / 6.6 Transformer Rating is 2.5 MVA and Transformer Impedance is 6%. % Reactance at Base KVA = (Base KVA x % impedance at Rated KVA) / Rated KVA % Reactance at Base KVA = (2.5X6)/2.5 U. Reactance of the Transformer (Z Pu) =% Reactance /100

How to calculate the base kVA of a short circuit?

Calculate Fault current at each stage of following Electrical System SLD having details of. Main Incoming HT Supply Voltage is 6.6 KV. Fault Level at HT Incoming Power Supply is 360 MVA. Transformer Rating is 2.5 MVA. Transformer Impedance is 6%.