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If you look carefully at a Buchholz Relay, it is not 'slightly inclined'. In fact, it is perpendicular. However, it is located in an inclined pipe between the transformer and the oil expansion tank above the transformer. The reason why the pipe is inclined is to allow any gas generated by a fault in the transformer to move upwards towards the expansion tank. This gas will then collect inside the relay, causing the warning float to move downward and trigger an alarm inside the substation.
The conservator tank is installed above the tank level. The gas bubble tries to move to the conservator tank, in between the buchholz relay the gas bubble gets holded in the buchholz relay (becoz of that 5 to 7 deg angle and also the oil pressure of conservator tank bcoz of angle inclination (if it is vertical, no pressure to conservator and buccholz relay) )and it presses the float in buchholz relay to downwards and it will activate the alarm trip for once if the gas develops at the time of fault.
suppose if the pipe is totally horizontal the gas try to accumulated at the top of the pipe (not in the buccholz relay) gas will go to conservator tank directly becoz (buccholz relay also horizontal if pipe is horizontal).so the purpose of buccholz relay fails.
Regards,
Balaji K,
APL,Ahmedabad
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What is buclozs relay in transformer?
A Buchholz relay is situated in an inclined pipe between the transformer itself and its expansion tank. It (a) provides an alarm should there be an oil leak or if excessive gas accumulation within the relay and, (b) will disconnect the transformer in the event of a major oil loss or a surge within the oil (caused by a fault within the transformer).
Drop out voltage of a solid state relay?
Typically, when the coil voltage on a relay is decreased gradually, the relay "hold" will release at a certain voltage. This is usually defined as the Drop-out voltage (defined at some minimum value). Now, in the case of latching relay, the Drop-out voltage is called the Reset voltage.
What is phase angle?
The angle by which a circuit's current leads or lags its supply voltage.
How capacitor and resitor in a circuit effect the phase of input voltage?
A capacitor and a resistor has no effect on the supply voltage; however, this particular load combination will cause the load current to lead the supply voltage by some angle termed the 'phase angle'.
How does the low-voltage circuit controls the power to the high-voltage circuit?
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What is buclozs relay in transformer?
A Buchholz relay is situated in an inclined pipe between the transformer itself and its expansion tank. It (a) provides an alarm should there be an oil leak or if excessive gas accumulation within the relay and, (b) will disconnect the transformer in the event of a major oil loss or a surge within the oil (caused by a fault within the transformer).
Why bucholz relay only connected in the pipe between conservator and transformer tank?
A Buchholz relay is a hollow, oil-filled, vessel, containing two pivoted floats, located one above the other, with each containing a mercury switch. It is located in an inclined pipe (3 - 7 degrees) between the transformer tank and its conservatory, or expansion, tank. The upper float initiates an alarm, while the lower float causes the protection sytem to disconnect the transformer.The Buchholz relay is provides protection for the transformer in the event of (1) a loss of oil, (2) minor electrical faults within the windings, and (3) catastrophic breakdown of winding insulation.(1) If an oil leak allows the oil level to fall below the level of the Buchholz relay's location (above the transformer), then the upper float pivots downwards, its mercury switch closes and initiates an alarm inside the substation. If the oil level continues to fall, then the lower float will pivot downward, and its mercury switch will also close, initiating a trip sequence that will disconnect the transformer.(2) Minor short circuits within the the transformer's tank will break down the oil, generating a gas which will bubble upwards through the tube between the tank and the conservator tank, and some of this gas will gather within the top of the Buchholz relay, causing the upper float to pivot downwards, initiating an alarm in the substation.(3) A catastrophic insulation breakdown will create a pressure wave within the oil, which will pass through the Buchholz relay on its way to the conservatory tank. This pressure wave will deflect the lower relay (which is also fitted with a flap, allowing it to react to a pressure wave), causing it to pivot downwards, and cause the transformer to be disconnected.Two stopcocks, located at the top of the relay enable testing the operation of the floats, and for taking samples of any gas captured within the relay. The colour of the gas is an indicator of the likely source of the internal fault (e.g. white -probably paper-based insulation failure; yellow -probably wood-based insulation failure). A sample of the gas can be passed through a silver nitrate solution -if it remains clear, then it is air; if it turns cloudy, then it is gas caused by insulation breakdown.So, as you can see, it is essential that the Buchholz relay is located between the transformer tank and the conservator tank.
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