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Calculate the frequency of the recovery voltage transient

Assignment Help Electrical Engineering
Reference no: EM132154613

Electrical Engineering Assignment - Electrical Supply and Distribution

Q1. (a) What is meant by 'discrimination' when applied to protective relays on an electrical supply system and why is it necessary?

(b) Which relay on the radial feeder shown in the diagram will have the shortest operating time and operate first in the event of the fault shown?

345_figure.png

(c) Which types of relay would be found on a ring feeder and why?

Q2. (a) State briefly the main advantages and disadvantages of radial and ring feeders.

(b) Explain the relationship between power and energy and hence determine the number of megajoules in one unit of electricity.

Q3. (i) A medium-sized clothing factory takes its supply at low voltage and has the following meter readings for the month of September.

MD

(day)

428 kW

MD

(night)

87 kW

 

 

 

kWh

(day)

72180

kWh

(night)

10060

If the average power factor is 0.843, find the bill for the month, using the supplier's tariff

2037_figure1.png

(ii) A large continuous process foundry works a night shift and takes its supply at high voltage.

For the month of December the following meter readings are recorded.

MD

(day)

1792 kW

(night)

1607 kW

Units

(day)

224368 kWh

(night)

289560 kWh

Reactive

(day)

131140 kVArh

(night)

195510 kVarh

Chargeable Capacity

2123 kVA

 

 

Find the average power factor for the month and calculate the electricity bill.

Q4. The diagram below shows the single phase equivalent circuit of a 275 kV, 3-phase source connected to a line and a circuit breaker, and a fault on the system is shown.

2133_figure2.png

Calculate:

(a) The frequency of the recovery voltage transient.

(b) The maximum voltage to appear across the CB contacts.

(c) The average rate of rise of recovery voltage transient.

Q5. With reference to the following high voltage fused and circuit breakers, briefly describe the principle of arc suppression, control and interruption of the circuit.

(a) Oil CB

(b) Air blast CB

(c) Vacuum

(d) SF6 CB

(e) HRC liquid fuse

(f) HRC expulsion fuse.

Note - Please assist with learning. Thanks.

Verified Expert

This assignment helps to understand the different types of fault analysis in electrical power supply system. The tariff for industrial consumers, both the high and low voltage levels can be understood by calculation. Different types of circuit breakers and fuses are also explained. These are explained with the help of corresponding diagrams

Reference no: EM132154613

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inf2154613

11/26/2018 1:38:31 AM

we want to consider PF as per the question. 0.843 I have received the assessment even before the given deadline. I hope that the solution is perfect as it seems after first look. I must say that there is no issues of price when you ask expertsmind. Just submit your task with all the relevant informations and forget about the quality what else a student require more. Service is always great as usual. thanks

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