I recently used BLDC Motor(A2212) of 1200kv rating. I used a Avionic 2.4 GHz RZ6 Receiver and applied a 7.4V,2300 mAh LiPo Battery at its terminals via ESC rated at 30A,there was no problem in the motor.
When i increased the Supply by attaching two similar batteries in series to attain higher RPM, the receiver got burnt and couldn't be used further.
The receiver is rated as "Power supply - 4,8V to 8,4V on dedicated connector"and "Amp draw - < 40mA"

My question is does whether application of higher voltage affects the receiver as it only draws the essential voltage required for signal transmission?
And can the reason of burning of receiver be due to faulty ESC?

PLZ Help............

Did you connect the batteries in series and made a 4S lipo and connected it to the ESC ?
Is the ESC rated to operate at 4S?
if it is not rated to operate at 4S then its BEC may output high voltage that may have burnt the rx.

The ESC was burnt, not your receiver.  Try a different ESC that you know works properly and report the results.

Your description of the setup is confusing.  Did you apply the battery directly to the ESC?

@santosh:
Yes,i guess i did make the 4s battery...

@theleabres:

I connected the battery with 14.8V to ESC Battery Terminals(RED AND BLACK).The 3 pin wire (RED,BLACK,WHITE) of ESC were then connected to receiver terminals(channel 1) and 3 same colored wires(Blue) were concencted to BLDC Motor

Test the receiver with another ESC and a 2S battery.

I will surely change the battery and the receiver,but could you tell me whether the voltage applied to the esc can cause the receiver to burn?

Check the max input voltage rating of your ESC. Escs generally use a liner voltage regulator to supply 5 volts to the rx. Most of the regulators available on the market can cope with the maximum voltage that a 4 cell pack can output. If you have access to a DVM, I would first check the voltage output of the esc. If you see a steady 5V, then there s nothing wrong with the esc.