MyQuestionIcon

10

You visited us 10 times! Enjoying our articles? Unlock Full Access!

Electric Motor

A power stati...

Question

A power station consists of two synchronous generators of rating 500 MVA and 1000MVA with inertia 0.8 pu and 0.5 pu respectively on their own bases MVA rating. The equivalent pu inertia constant on 200 MVA common base is___.
4.5

Open in App

Solution

The correct option is A 4.5
Inertia constant $H \propto \frac{1}{M V A r a t i n g}$

$H_{n e w} = H_{1 o l d} \times \frac{S_{1 o l d}}{S_{n e w}}$

$= 0.8 \times \frac{500}{200} = 2 p u$

$H_{n e w} = H_{2 o l d} \times \frac{S_{2 o l d}}{S_{n e w}}$

$= 0.5 \times \frac{1000}{200} = 2.5 p u$

$H_{e q} = H_{1 n e w} + H_{2 n e w}$

$= 2.0 + 2.5 = 4.5 p u$

Suggest Corrections

thumbs-up

0

Similar questions

Q. A power system consists of two synchronous generators P and Q of rating 300 MVA and 450 MVA with inertia constant 1.8 pu and 1.0 pu respectively. On their own base MVA ratings, the value of equivalent per unit inertia constant for the parallel system on 200 MVA common base will be

Q. Statement:
A generator feeds power to an infinite bus through a double circuit transmission line. A 3-phase fault occurs at the middle point of one of the lines. The infinite bus voltage is 1 pu, the transient internal voltage of the generator is 1.1 pu and the equivalent transfer admittance during fault is 0.8 pu. The 100 MVA generator has an inertia constant of 5MJ/MVA and it was delivering 1.0 pu power prior of the fault with rotor power angle of

30^{\circ}

. The system frequency is 50 Hz.

If the initial accelerating power is X pu, the initial acceleration in elect deg/

s e c^{2}

, and the inertia constant in MJ-sec/elect deg respectively will be

Q. The per unit parameters for a 1000MVA machine on its own base are
M=40 pu and H=5pu.
The per unit values of M and H on 100 MVA base are

Q. A synchronous generator having synchronous reactance of 1.0 pu is connected to infinite busbar of 1.0 p.u voltage through 2 parallel lines each of 0.5 p.u. reactance. The generator excitation when it is delivering zero active power and 0.5 pu lagging reactive power to the infinite busbars is____ p.u.

Q. A power system has two buses which are interconnected by a cable of reactance j0.04 pu. The buses individually have two generators connected to them as shown below with

| V_{1} | = | V_{2} | = 1 p u .

If load demand at bus 1 and 2 are respectively

S_{D_{1}} = (30 + j 10) p u a n d S_{D_{2}} = (25 + j 10) p u .

The value of total reactive power of generating station

G_{1} w h e n δ = 20^{\circ}

will be ______pu.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Electric motor

PHYSICS

Watch in App

explore_more_icon

Explore more

Standard X Physics

Join BYJU'S Learning Program

CrossIcon