Answer / sudhanva madhukar mahamuni

Hello To every One,

This is Sudhanva Madhukar Mahamuni Electrical Design
Engineer. The reason behind the same is not a alternator /
generator. The reason behind the same is diesel engine.
(Surprise!!!!!!!!!!)

Carefully read the catalog of DG Set for e.g. for 750kVA its
written as 750kVA / 600kW @ 0.8 pf. It means that alternator
size is 750kVA and 600kW is of Diesel engine. It means that
diesel engine can delivery only 600kW power. so if we like
to maintain the same then we need to keep 750kVA load on DG
@ 0.8 (750 x 0.8 = 600kW.

But assume that your load on alternator is 600kVA then you
are allow to improve your power factor till unity i.e. 1.
Therefore load on engine will be 600kVA x 1 = 600kW.

Summary : if multiplication of electrical load (in kVA) to
Power Factor will be upto or less than kW rating of diesel
engine then we can play with power factor i.e. lead or lag.

Note : If we will not do as above mentioned and improve the
power factor then engine will cease off (dead) i.e. cant
repair or modify.

For further clarification you can call me or mail me on
sudhanvamahamuni@structwel.com or sudhanvamahamuni@gmail.com

Regards

Mahamuni
9769317386

Answer / prakash veer singh

In DG ,we maintein pf .8 because , if pf decrease than
alternator has overload due to more current dron by load .
And if pf is increase ,than engine has overload due to
increase potational (volt ).

So maintain DG pf is 0.8 .

Answer / vinodth

consider 1 transformer having the power 125mw,33kv...
1)p=125mw,
v=33kv,
cosQ=0.8
p=1.732VlIlcosQ
I=125000/1.732*33000*0.8
I=2733.7
2)cosQ=0.7
I=125000/1.732*33000*0.7
I=3124.29
loss=i*ir..if the pf reduces,then loss get increases...v
cant maintain the pf as unity,tats y the pf s maintained as 0.8

Answer / jayashree

Mr. Vinodth, the query is about DG. Please answer it again.

WHAT IS A BASIC DIFFERENCE BETWEEN THYRISTOR,TRIAC AND A DIAC.AND WHAT R THERE APPLICATIONS?

5 Answers   Petronas, TCS,

---

where we sense the fault from the transmission lines?any operation example for distance relay?rear panel connection for this relay?

1 Answers  

---

Why Transformer Neutral having one earth pit ( more earth electrode resistance) whereas body have many earth pit ( less earth electrode resistance)?

0 Answers   OPS,

---

how to extend relay operating timing in 24V dc relay card (without using Timer )

0 Answers  

---

will we have to design the UPS differently for both i.e. if we want to connect the two batteries in parallel and/or we want to connect the two batteries in series ?

4 Answers  

---

1.what is use of isolation transformer. 2.Differance between KWH,KVAH,KVARH,KVA. 3.Main use of the CT and PT.

1 Answers  

---

Why is it that polarization index type test is required for MV and HV motors and not for LV motors?

3 Answers   La-Gajjar Machineries, Qatar Airlines,

---

pls send me some question and answer for rrb railway interviw related 2010

2 Answers   CEAT, RRB,

---

In my power station 220 volts dc battery set. they coneected 84th cell taped

1 Answers   KPTCL,

---

HI....HOW CAN BE MESARED THE VALVE OF NEUTRAL GROUND RESISTOR WHIC IS LOCATED AT SWICHGEAR ON GENERATOR SIDE....

0 Answers   Jindal,

---

What does the term supermesh means?

0 Answers  

---

How to calculate meter constant @ HT yard

5 Answers   Juniper Networks,

---