Answer / iamdon

This is due to residual magnetism in the core which is
inherenly present.

Author:arbelectbit@yahoo.com

Answer / avd

I am not agree with you people. Residual magnetism can not
produce any emf. You need a variable flux or rotating
conductor to produce emf, which is not the case.
There will not be any voltage in sec winding if primary is
kept open.

Answer / shyam

bcoz even if the hv(secondary side) is opend there will be
a small amount of flux flows through the core of the
transformer

Answer / thuranga

we can find voltage on lv side even when we remove hv
side,is because of its residual flux present in the
core......and this can happen only if there is no perfect
grounding to the transformer.
even though the grounding is not present, the voltage appear
for only a short time,as that voltage will get consumed by
the inductance and capacitance on the LV side of the
transformer.

Why generally the transformer primary is connected in star & secondary in delta

7 Answers  

---

What is meant by bus bar protection?

0 Answers  

---

what is meaning of 230volts ac 50hzs ac supply is it rms or maximum to getting ac 230v what amount of max voltage they will send

0 Answers  

---

what type of load we can give to motor shaft?

2 Answers  

---

What is AMF Panel????

3 Answers   Emerson,

---

how capacitor buield up the voltage

3 Answers  

---

Stator core loss of squirrel cage induction motor compared to rotor core loss is= A equal B more C less D depends on load

2 Answers  

---

any calculation method for decide cable size for current?

1 Answers  

---

Whot is the braking capacity for MCCB. How we select different braking capacity.

1 Answers  

---

What should be the Sandwitch type Al. bus bar capacity for 2 M.W.Gen. set, having continuous full load current- 3463 Amps,ambient temp.- 50 Deg. C., Required temp. raise-20 deg.C., it will run 24 hrs, 365 days on full load, required highly reliable.

0 Answers  

---

Why relay connected R phase and B phase.?

1 Answers  

---

During Testing of Maintenance Free Earthing, How deep should be the Spikes of Earth Test Meter should be inserted in the soil(one spike is 15 Meter & Other spike is 30 Mtrs away from the Main Earth Electrode. Because, recently, we observed that when spike is inserted 3-4 Inch in the earth- results are better, If spike is inserted 1 feet deep than results are increasing.

0 Answers  

---