SLC22/WK1: Advanced Electrical Transformers and the Power Factor

Assalamu Alaikum

_{I'am @mpolasmia
From #bangladesh🇧🇩}

Hello Steemian Friend,
How are you all I hope you are all well. Today I am hosted by @mahadisalim Sir. SLC22/WK1: Advanced Electrical Transformers and the Power Factor. I want to participate in the competition. Thanks @mahadisalim Sir for giving us such a beautiful competition. I hope everyone likes this contest.

My Thumbnail Photo & Designed By Canva

A1. Name the two transformers from the diagram and explain why.

★The two transformers are :-
1.Step up transformer
2.Step down transformer.

Explain:-

1.Step up transformer :-	2.Step down transformer:-
There is voltage low to high 220/415.So voltage is increasing. That is why it is called step up transformer.	There is voltage high to low 415/220.So voltage is decreasing. For that it is called step down transformer.

A2. What is the turn ratio of the two transformers?

First transformer turn ratio:-	2nd transformer turn ratio:-
a= Np/Ns	a = Np/Ns
= 4/8	= 8/4
= 0.5 A	= 2 A

B. Identify the various parts of a power transformer with a picture and write the function of each part.

Various parts of a transformer and the function of each part:-

★Tank:- A transformer tank protects the core and windings.
★Buchholz relay:- If transformer any problem like -oil,coil and Internal fault,that time this relay automatically turn off.
★Radiator:- A transformer cools by a radiator.
★Breather:- A silica gel -filled cylinder that prevents moisture from intering the oil
★Transformer oil:- Transformer oil insulates and cools the transformer and can detects faults.

A power transformer picture

Design By PixelLab

C. What type of transformer is used for your home's electricity? Describe your understanding with pictures.

Distribution transformer is used for our home electricity.
A distribution transformer is used in homes to step down the high voltage electricity from power lines to a safe. Usable voltage for house hold appliances and lighting.

D. Calculate how many KVA transformers will be required for a 5000 KW load.

Answer:-	Here,
KVA= KW/PF	KW= 5000
= 5000/0.9	We know,
= 5555.55~5555KVA	Pf = 0.9

6000 KVA transformer will be required for a 5000 KW load.

E. Look at the transformer's nameplate in the picture and find out the following points.

Transformer Description	Details
Transformer name:-	Energypac
Transformer ratio:-	2500 KVA
Primary voltage (HV):-	33000V
Secondary voltage (HV):-	415V
Current (HV):-	43.74A
Current (LV):-	3478.11A

F. Find the currents in the high voltage (HV) and low voltage (LV) sides of the 33/0.415 kV, 2.5 MVA transformer.

HT

LT

G. What do you mean by power factor? What is the power factor value given by the electricity supply company in your country?

I know the
Power factor (PF) is a measure of how efficiently an electrical system uses electricity.So the power factor means how much electricity we use. It's calculated by dividing the real power (kW) by the apparent
power (kVA)

PF=kW/kVA

In my country(Bangladesh) fixed the power factor value from 0.95 to 1.00.

H. Given the nameplates of the two transformers shown in the figure, write three differences.

Three differences:-
1) One transformer HT Voltage is:- 33000V and other is - 11000V.
2) One transformer current HT:- 10.5A and LT - 278.2A and other current HT 43.74A. LT - 3478.11A.
3) One transformer:- 2500 KVA and other 200 KVA.

Determine True/False:

Determine Name	True/False
1. The name of the oil used in a transformer is pyranol.	True
2. The core loss of the transformer is in the winding.	False
3. The efficiency of the transformer is less than that of other electrical devices.	False
4. The transformer rating is in KW.	False
5. The transformer's insulation test is done with a megger meter.	True

SL NO.	My Invited Steemian Friend
1.	@lirvic
2.	@tahispadron
3.	@simonnwigwe

Regards:- @mdpolasmia