Question { 26492 }

why we oltc on hv side of tranformer only

Answer

On Load Tap Changer in a device which works under running
condition to increase or decrease the voltage level of the
Primary & Secondary Side... It is preferable to provide @
HT Side why because in HT Side the current rating is low
while in the LT Side current is so much high.... as we done
the operation of tap changing under loading condition at
the LT Side a huge spark will occur & Damage the
Transformer... That is why only the OLTC is placed on HT
Side

Question { HAL, 11703 }

What is the full form of SON-T lamp?

Answer

In Sodium Vapour Lamp Cover we see this SON-T Lamp....
Somewhat more radiation in the blue part of the spectrum.
At low light levels it is important to have enough blue
light, in order to obtain a nice full crop growth without
elongation of the plants. However, the Agro lamp gives
less “growth light” than the Green Power lamp. At higher
light levels there will already be enough blue radiation,
so the raised level of growth light from the Green Power
lamp will give a better production. So, the Agro lamp is
best used at low light levels (2000-3000 lux) and a compact
crop growth, whereas at higher light levels (>3000 lux) the
Green Power lamp will give the best results for the
majority of crops.

Question { 6621 }

How to the calculating the Reactive power ( kvar )

Answer

Reactive Power = Apparent Power X (Sin Ø)

Reactive Power - in KVAR

Apparent Power - in KVA.

Where Ø - Phase Angle Between Voltage & Current

Question { BEC, 164973 }

1ampear me kitna watts hota hai aur elcb ka pura naam kya hai

Answer

ELCB - Earth Leakage Circuit Breaker

It will trips if any leakage in the elctric circuit

Current will depends upon which system you are using usually single or three phase

formula

Watts = VI Cos (Phi)
Watts = 1.732 * VI ( COS (phi) )

Question { 3504 }

Consider a case that two 200 hp motors are connected to 500KVA transformer. For improving power factor can we add capacitors in common bus bars to motors. Or should we add capacitors for each individual motor?

Answer

Normally, Induction motor current lags the voltage (lagging power factor), to improve the system power factor, we have to add the capacitors in parallel with the load end. Somewhat we can improve the PF to some extend value.

Question { 5149 }

Why rating of transmission line in kv not in kva

Answer

In hv line, voltage level is high