Objective:

To help students understand the factors that can help reduce the bill of an industry consumer.

Problem Statement:

Cheecha Watni Textile Limited had a serious issue related to high electricity bills. An industrial

bill consists of two major consumption parameters as follows $1)$ consumed KWH and $2)$

Apparent power of the unit. You were hired to visit the unit to investigate the problem. It was

observed that real power demand of the plant is fixed at $20,000$ kW whereas apparent power was

$33,000$ kVA with a lagging power factor. The apparent power bill was $2$ million rupees per

month. It was investigated that, this part of the bill could be brought to zero if the apparent power

was brought to $20,000$ kVA. However, cost of this solution was not feasible for the plant

administration, therefore it was decided to make apparent power to be equal to $4*($last $4$ digits

of your roll number$)$ KVA. For example, if your roll number is $23$L$-6200,$ take the new apparent

power to be $6200*4=24000$ kVA. The rms value of the voltage across the plant is $1000$ V$.$

For this purpose, a black box was designed and installed in the plant.

$.$

$$ What was the major cause of high electricity bill?

$$ What is inside the black box? Support the correctness of your design through calculations

$$ Why did the connection of black box reduce the bill? If the apparent power bill reduces

linearly, calculate the reduction in bill with the new apparent power.

$$ What should be the design for zero apparent power configuration?

$$ How can you relate this to the concept of power factor?

Deliverable:

Write a brief report justifying your analysis with answers to all questions for your proposed

solution.