Figure 1 shows the schematic diagram of a three phase radial transmission system. The ratings and reactance of various components are as shown, along with the nominal transformer rated line voltage. Convert the schematic into an equivalent per unit circuit by using a base of 250 MVA and voltage reference as 40 kV at Zone C. Subsequently, calculate the new per unit reactance for all zones and load current at the receiving busbar.

Q: determine the per-unit impedances and the per-unit source voltage. Then cal- culate the load current…

A: Electricity moves through a single conductor in a single-phase connection. The three independent…

Q: A three phase Y/A transformer rated at 50 MVA, 230/34.5 kV is to be protected using biased…

A:

Q: A 33 KV substation is to be connected to a 11 KV stepdown substation which is at a distance of 1.5…

A: We have Transmission line which connects 33 KV Sub-Station to 11 KV Substation. This line is 1.5 KM…

Q: Q3/A/ Fill in the blanks: 1. The most common type of 3-phase unsymmetrical fault is 2. In a balanced…

A: The solution is given below

Q: A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the…

A: x=1y=7Note: reactance of element right to bus 4 is not given. Hence we will not consider that in…

Q: Q5 The single-line diagram of a three-phase power system is shown in Figure Q5a, with equipment…

A:

Q: determine the line-to-neutral (120 V)

A:

Q: B) Develop an expression, in terms of the generated e.m.f. and the sequence impedances (ZI, Z2 and…

A: Solution (B) - For phase A, the line to earth fault is shown below,

Q: A 40000-KVA, 25000-V/600-kV, single phase transformer has the following series impedances: Z1=…

A:

Q: Calculate the cantilever equivalent-circuit parameters as referred to the transformer high-voltage…

A: I have solved for both parts

Q: The fault current level of a circuit breaker used in a transmission line with phase voltage 4.6 kV…

A: Given, phase voltage = 4.6kV Breaking capacity=40MVA fault current=?

Q: Three single-phase two-winding transformers,

A:

Q: Problem 6 a- Explain the reasons for applying system grounding in electric power systems. Consider…

A: The current flowing through a circuit during a fault condition is called fault current. Fault types…

Q: 7. Two similar star-grounded synchronous generators, one of which has its star point grounded,…

A: The nature of the fault current is mostly inductive reactive in nature. The flux produced by the ac…

Q: b) A fault occurs at bus 2 of the network shown in Figure Q3. Pre-fault nodal voltages throughout…

A:

Q: The faults which give rise to unsymmetrical currents (unequal line currents with unequal…

A: The above statement is incorrect or false.

Q: The results of open-circuit test and short-circuit test for a 60 kVA , 2400/500 V single phase…

A: In this question, open-circuit test and short-circuit test for a 60 kVA , 2400/500 V single phase…

Q: Find the cross correlation of functions sin o t and cos ot

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Q: The single-phase step-down transformer is rated 13 MVA, 66kV/11.5kV. With the 11.5 kV winding…

A:

Q: b) A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout…

A: POWER SYSTEM: A power system is a network of electrical components that provide, transmit, and…

Q: (b) Given the two-machine system of Figure Q2 (b), a base voltage of 132 kV for the transmission…

A:

Q: Explain the following items i) Steps used to draw the equivalent impedance diagram of the network

A: Dear student as per our guidelines we are supposed to solve only one question.kindly repost other…

Q: 8. A three-phase 50 Hz, 200 MVA, 220/66 kV transformer has a clock number of Yd11. The transformer…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: In the single line diagram shown below, generators G₁ and G₂ have a leakage reactance of 0.26 per…

A: Given single line diagram, Ratings of the generator G1 and G2, 66.5 MVA11 kV0.26 pu

Q: A 50 MVA, 3-phase, 115 kV (Grounded Y) - 34.5 kV (Delta) transformer is delivering a 40 MW load at…

A: Distribution line is connected to transformer at one end and load at other end as shown below

Q: Figure below shows a power system where load at bus 5 is fed by generators at bus 1 and bus 4. The…

A: When line L1 has length =100 km, fault current for fault at bus 5 is =2530 A When line L1 reduced to…

Q: A single line diagram of a small power system is shown below. The corresponding reactances…

A:

Q: Please answer this diligently. Other answers in the internet seems wrong. Please help me understand…

A: First, we need to calculate the base current. The base current (Ibase) can be calculated using the…

Q: The sample large power system network  data's  are  given below, The total number of buses  is 5…

A: There are two types of symmetrical faults: a) Three-phase short circuit fault. b) Three-phase to…

Q: 2. The impedance of a 10 MVA, 22/220 kV transformer is 0.2 per unit. What is this impedance in per…

A: In a transformer, Base KVA, Sbold=10 MVA. Base voltage on LV side, Vb(old)=22 kV. Old impedance,…

Q: In a three phase overhead system, each line is suspended by a string of three insulalor. The voltage…

A:

Q: A 300 KVA, 3300/400 V, three-phase transformer has its primary and secondary windings connected in…

A: A 300 kVA, 3300/400 V, three-phase transformer- Magnitude of the injected voltage in open delta of…

Q: 3. A 40-MVA, 20-kV/400-kV, single-phase transformer has the following series impedances: Z1 = 0.9 +…

A:

Q: The single line diagram of a power system is shown in Figure Q2.1 including generator and…

A: Given length of line =50 km MVA base = 100 MVA For line , base voltage =11 kV

Q: A three – phase, 13 – kV transmission line delivers 8 MVA of load. The per – phase impedance of the…

A:

Q: 2) For a given short-circuit calculation utilizing the per unit method, a base voltage of 480 V and…

A: Given, Base voltage, Vb=480 V Base power, Sb=2500 kVA

Q: Consider a single phase transformer of rating 150 KVA, 1500/150, 50 Hz. Let the series resistance…

A: Given: Z1=R1+jX1=0.2+j0.45 ΩZ2=R2+jX2=0.002+j0.0045 ΩKVA=150

Q: Mention the types of iron cores in the transformers and the effect of the shape of the iron core in…

A: Iron Cores are also part of  transformers

Q: The base current and base voltage of a 345 kV system are chosen to be 3000A and 300kV respectively.…

A: The solution is given below

Q: 2) For a given short-circuit calculation utilizing the per unit method, a base voltage of 480 V and…

A:

Q: A three-phase, 100-MVA, 20-kV generator is connected to a three-phase, 100-MVA, 20-kV motor through…

A: The short-circuit current can be determined using the formula I = V / (Xg + Xl + Xm) where I is the…

Q: A three-phase load of 10 A (power factor 0.8 (end)) is fed from point “1” 600 m away from a…

A: (a) The active and reactive current distribution -

Compensation Techniques

The compensation techniques are the methods that are employed in the electrical control systems to enhance the performance of the system. The performance are generally affected by the factors like lag in the compensating devices, slow response of the system of the components like sensors used in the control system. The basic compensation technique involves lag compensation, lead compensation or the combination of the both.