Question: A generator-transformer unit is connected to a line through a circuit breaker. The unit ratings are as shown in Table Q 1. Unit Generator

A generator-transformer unit is connected to a line through a circuit breaker.

A generator-transformer unit is connected to a line through a circuit breaker. The unit ratings are as shown in Table Q 1. Unit Generator Transformer Table Q 1 Parameter Ratings 10MVA,6.6KV,X = 0.8p. u, X = 0.2p. u X 10MVA, 6.6/33KV, Reactance 0.08p.u The system is operating no load at a line voltage of 30KV, when a three phase fault occurs on the line just beyond the circuit breaker. Find the following: a) Initial symmetrical rms current in the breaker b) Maximum possible DC off-set current in the breaker c) Momentary current rating of the breaker d) Current to be interrupted by the breaker and the interrupting kVA e) Sustained short circuit current in the breaker

Step by Step Solution

★★★★★

3.43 Rating (169 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Electrical Engineering Questions!

The initial and final velocities of an object are as shown in Figure. Indicate the direction of the average acceleration. 'a

As shown in Table 24.1, water has a very large dielectric constant K = 80.4. Why do you think water is not commonly used as a dielectric in capacitors? Table 24.1 Values of Dielectric Constant Kat...

As shown in Table 15.2, Kp for the equilibrium is 4.51 Ã 10-5 at 450 oC. For each of the mixtures listed here, indicate whether the mixture is at equilibrium at 450 oC. If it is not at...

Jerry Goff, president of Harmony Electronics, was concerned about the end-of-the-year marketing report that he had just received. According to Emily Hagood, marketing manager, a price decrease for...

M. de Koster, of Rene Enterprises, has the master production plan shown below: Period (weeks) 1 2 3 4 5 6 7 8 9 Gross requirements 15 20 10 25 Lead time = 1 period; setup cost = $ 200; holding cost =...

Sue Wilson is the new financial manager of Northwest Chemicals (NWC), an Oregon producer of specialized chemicals that are sold to farmers for use in fruit orchards. She is responsible for...

Express the explicit shape functions for the corner nodes of the quadratic hexahedral element shown in Figure 11-6 on page 551. Figure P11-6, (a) (b) (25. 25.0) 2 (10, 0, 0) (40, 0,0) (25, 0, 25)...

Mass m 1 on the frictionless table of FIGURE EX8.13 is connected by a string through a hole in the table to a hanging mass m 2 . With what speed must m 1 rotate in a circle of radius r if m 2 is to...

In the study of heat transfer, the equation x + tan x = 0 occurs. Graph Y 1 = -x and Y 2 = tan x for x 0. Conclude that there are an infinite number of points of intersection of these two graphs....

A separately-excited dc motor is mechanically coupled to a three-phase, four-pole, 30-kVA, 460-V, cylindrical-pole synchronous generator. The dc motor is connected to a constant 230-V dc supply, and...

Firm A next dividend will be $2.5 per share. The dividend growth rate during year 1 is 24.5%, during year 2 is 20%, during year 3 is 18.5%, and during year 4 is 12%. From year 5 to year 10, the firm...

The motion of nozzle D is controlled by arm AB. At the instant shown the arm is rotating counterclockwise at the constant rate = 2.4 rad/s and portion BC is being extended at the constant rate u =...

Five years ago there were 3 0 7 1 students enrolled. Now there are 2 4 1 8 students enrolled. what has been the rate of change in student enrollment

Identify how changes within an organization affect the OM strategy for a company. For instance, discuss what impact the following internal factors might have on OM strategy: a) Maturing of a product....

Within the food service industry (restaurants that serve meals to customers, but not just fast food), find examples of firms that have sustained competitive advantage by competing on the basis of (1)...

The text provides three primary ways-strategic approaches (differentiation, cost, and response)-for achieving competitive advantage. Provide an example of each not given in the text. Support your...

Based on the competitiveness ranking developed by the Global Competitiveness Index (www.weforum.org), rank the following countries from most competitive to least: Mexico, Switzerland, the U.S., and...

Based on the corruption perception index developed by Transparency International (www.transparency.org), rank the following countries from most corrupt to least: Venezuela, Denmark, the U.S.,...

please A company is considering a $185,000 investment in machinery with the following net cash flows. The company requires a 10% return on its investments. (PV of $1, FV of $1, PVA of $1, and FVA of...

Figure Qu. 1 below shows a simple Single Line Diagram (SLD) for a power system where a Utility supplies a 66 kV Customer. - 13.8 kV The 'PG Bus' is a 13.8 kV Power Generation Bus, to which Generators...

Hello, you already did chapter 1 and 2 of my MASTERS Thesis already for me. (See attached) So normally you know masters thesis consist of 5 chapters right ??..... But in this case my thesis will be 4...

A single line diagram of a 3-phase power system is shown in Figure 2. Positive, negative and zero sequence impedances of the system are shown in the Table 2. Select base 100MVA. The neutral of the...

Repeat Problems 9.1 and 9.14 including $\Delta-Y$ transformer phase shifts. Assume American standard phase shift. Also calculate the sequence components and phase components of the contribution to...

(a) Compute the $3 \times 3$ per-unit zero-, positive-, and negative-sequence bus impedance matrices for the power system given in Problem 9.1. Use a base of $1000 \mathrm{MVA}$ and \(765...

Using the bus impedance matrices determined in Problem 9.42. Problem 9.42 (a) Compute the $3 \times 3$ per-unit zero-, positive-, and negative-sequence bus impedance matrices for the power system...