Fig. 2 shows an example of power system protection system divided into several sections. In a case where fault occurred at P (marked in the figure), list down the circuit breaker/s that will act as the primary protection system and the backup protection system. RL-5 RL-6 平 P L67 C7 B4 G11 C1 82 L89 Generator Transformer Line Protection Protection Protection B3 RB RL-8 RL-9 Bus Protection Fig. 2

Fig. 2 shows an example of power system protection system divided into several sections. In a case where fault occurred at P (marked in the figure), list down the circuit breaker/s that will act as the primary protection system and the backup protection system. RL-5 RL-6 平 P L67 C7 B4 G11 C1 82 L89 Generator Transformer Line Protection Protection Protection B3 RB RL-8 RL-9 Bus Protection Fig. 2

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter8: Combination Circuits

Section: Chapter Questions

Problem 4PA: The hot water for the heating system for a small factory is supplied by a single boiler. The bolier...

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SUBJECT: Electrical Apparatus INSTRUCTIONS: • Please write clearly and understable way. • Write all the corresponding Given before solving. • Draw/Illustrate the diagram/circuit or drawings that is related to the problem, HIGHLY REQUIRED. • Solve in step-by-step, no shortcut, with formulas before sulutions together with the units • Underline twice the Final Answer. PROBLEM: • The following figures were obtained from tests on a 30-kVA, 3000/110-V transformer: Open Circuit test: 3000V ; 0.5A : 350W; Short Circuit test: 150V ; 10A ; 500W Calculate the efficiency of the transformer at (a) full-load, 0.8 p.f. (b) half-load, unity p.f. (c) calculate the kVA output at which the efficiency is maximum.
Show all steps and working please.a)The owner of a business requested a supply from the electric utility to his newly built establishment. His business has electrical equipment that require a 230V single phase and the usual 115V single phase supplies. He hired an electrician who did the wiring design for the building and calculated a total load demand of 40kVA. As a utility engineer, you are asked to consult with the electrician before the utility supply is connected and energized.i)With the aid of a suitable, labelled circuit diagram, clearly explain to the electrician how the utility achieves the different supplies the business requires.ii)With the aid of a calculation, state the current and kVA limit for the utility supply.iii)What considerations for metering and protection must be made if the calculated load demand of the business increases by 50% in the future?b)The utility experienced multiple faults at a substation causing damage to the transformer and cables. This led to…
i. Given the concept of Circuit Breakers discuss five types of circuit breakers and their principle of operation.ii. Produce the (1 Dimensional) design of the delta connected three phase faults .iii. Show the three criteria for the selection of a cable for power system distribution network.
The hot water for the heating system for a small factory is supplied by a single boiler. The bolier is locatd in a small building separate form the factory. The power supplied to the bioler is 240-volt single-phase without a netural conductor. At the present time, the small building housing the bioler has no inside lighting. The business owner desires that four 100-watt lamps be installed inside the building. All lamps are to be connected to a single switch. The lamps are to be connected to the present 240-volt sercvice inside the building. How would you accomplish this task? Explain your answer.
3. What is the impedance of the circuit in Question 2?
Q5. An essential part of the design of power supply network is the calculation of the currents which flow in the components when faults of various types occur. Explain briefly why fault calculation is an essential part of the design of power systems. Discuss the TWO different types of faults that are common in power systems; their causes; and method of calculation.
A power transmission line of 11kV (maximum) carries a maximum current of 200A is connecting the two areas. A PMMC voltmeter of (0-300V) range and a PMMC ammeter of (0-10A) range are to be used for measurement of voltage and currents of the transmission line. 1.Design and draw a circuit with suitable instrument transformers for the measurement. Use sample values for winding turns. 2.On a particular day, the readings shown by the meters were 7.5A and 240V. Calculate the actual voltage and current in the transmission line.
for the circuit shown, find the maximum power delivered to this load resistor? Please answer in typing format solution please only typing
d.1. What are the two concepts that make up grounding in its simplest form?A. Impedance and resistanceB. System grounding and equipment groundingC. DC systems and AC systemsD. Grounded and ungroundedd.2. Which of the following types of grounding electrodes was one of the first grounding electrodes to berequired for use?A. Ground ringB. Water pipeC. Concrete-encasedD. Rod and piped.3. What is the primary purpose of the National Electrical Code?A. To serve as a training manual for untrained personsB. To provide design specifications to professionalsC. To act as a collection of procedures for electriciansD. To safeguard against electrical hazards
Find the different Nodal Voltages on the circuit (V1, V2, V3).
Fill in the blanks 1. Grounding is connecting …….. of electrical equipment to earth. 2. When a …………………………….… fault occurs on an ungrounded neutral system, the potential of the healthy phases rise to the line voltage. 3. The method of reactance grounding is not used because of ……………………… appearing under fault conditions. 4. The cosine of the angle between the ………………………………………. and the ………………………………...…… is called the sending end power factor. 5. The AC power delivered to a load is equal to ………........
2. Apply nodal analysis to find the current io (t) in the following circuit. ?? = 6 cos (200? + 15 °) ?.