Common Mistakes in Understanding Electrical Transformers and Power Factor: SLC22/WK1 Review post 01

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Aftab Irshad
Admin : S4 Young Journey
@dev-pro

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I have mentioned earlier that your posts are mostly accurate, but there were a few minor mistakes. My goal is not to criticize, but to help improve and learn from these challenges. Steemit is a platform for learning and growth, so please don’t take any of my feedback as criticism. Thank you for your understanding and continued efforts!

A. Name the Transformers and Turn Ratio

1. Turn Ratio Calculation Mistake for Step-Up Transformer

   • Correct Turn Ratio:
     415/220 ≈ 1.89

2. Inconsistent Approach for Both Transformers

   • Correction:
     Maintain consistency by using either Es/Ep or Ep/Es consistently.

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B. Identify Transformer Parts

1. Simplification of Breather Function

   • Correction:
     The breather contains silica gel to absorb moisture and prevent oil contamination.

2. Temperature Gauge Details

   • Correction:
     It monitors winding temperature, oil, or ambient air to detect overheating.

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C. Home Transformer

1. Missing Explanation for Absent Components
   • Correction:
     Smaller transformers or dry-type transformers often lack conservator, Buchholz relay, and temperature gauge due to size and functionality differences.

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D. Transformer KVA calculation for 5000 KW load

1. Basis for Assumptions on Power Factor
   Correction

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In practice, in the absence of specific information, please consider a value of 0.9 as a power factor for all industrial activities.

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E. Nameplate Analysis

1. Incomplete Formatting

   • Correction:
     Use a table format for better readability:

     Parameter	Value
     Transformer Name	Energypac
     Rating	2500 KVA
     Primary Voltage (HV)	33 kV
     Secondary Voltage (LV)	415 V
     Current (HV)	43.74 A
     Current (LV)	3478.11 A

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F. Current in HV and LV Sides

1. Missing Formula for Validation

   • Correction:

Please use the formula provided below:

I = S/ (V sqrt of 3)

Where S = 2500 X 10^3 VA and V = 33kV

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G. Power Factor Explanation

1. Low PF Effects Context Is Not Well Developed

• Correction:

Whenever power factor is low, costs are higher in terms of losses, heating and due to imposed penalties from power them.

1. Lack of Evidence for the Our PF Value at Region Level

• Correction:

This clearly indicates the need to mention the source that stated that PF value was 0.78.

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H. Transformer Nameplate Comparison

1. Lack of Proper Formatting

   • Correction:
     Use a table format:

     Point of Difference	A (2500 KVA)	B (200 KVA)
     Impedance	6.6%	4.01%
     Oil Weight	2260 kg	244 kg
     Rating	2500 KVA	200 KVA

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True/False Statements

1. Transformer Efficiency

   • Correction:

     In industry practice, possible ranges of efficiency for transformers should not drop below 95%.

   • True/False: False.

2. Core Loss Location

   • Correction:

     The occurrence of core loss is during the operation of the transformer core.

   • True/False: False.

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Final Notes

• Grammatical Errors: There are some small typological errors that should be rectified, for example, ‘Conned’ should be ‘Connected’

• Formatting: Follow uniformity in the use of headings and where bullet points and tables are employed.

• References: Provide technical references while making a particular claim in case it is necessary.

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