Transformer buchloz relay and gas bubbles 1

[Mr zezo]

Why gas bubbles collected in the buchholz relay and don't collect at the transformer conservative tank and goes out from the breather?and when it can escape out from the buchloz relay? (According to physics point of view.)and does the lower float affected by the gas bubbles or it just for hard oil leakage or it is function is related to its position According to design meaning if it is above the flow path inside the buchloz (the straight line between the 2 holes where relay is connected to pipes) it will be like a second action when collected gas increases to its limit and if it's under the oil flow path it will be for just hard oil leakage?

 

[7anoter4]

In my opinion the difference in relay actions it is the gas flow speed. If it is slow when it flows through the relay it will slow eliminates the oil from the upper part of the relay and the flouter will fall down in the low pressure gas and acts the warning circuit. If the flow is high the dynamic pressure of the oil will act the lower flouter of the relay.

 

[prc]

1) When gas bubbles are released from the transformer (this can be due to incipient faults developning in the transformer, say overheating of lead or dissolved air in the oil getting released or locked air in pockets) this will get locked in the upper part of the relay, lowering upper float and actuating the alarm relay to bring the incipient fault to the attention of station operator. The amount of gas the relay can hold is small; if the gas coming from the transformer is large, the gas will move to the conservator after filling the relay.

2) If the fault inside the transformer is grave, say flash over from winding to ground or inter disc fault, the energy released will be large. It will vapourize oil and a massive amount of gas will be generated. The gas wave will create a dynamic pressure wave in oil that will push oil to the conservator. This high-velocity oil flow will actuate the lower float, tripping the transformer so that the damage inside the transformer will not aggravate to a tank rupture and a fire from the hot gases coming into contact with oxygen in the outside air. If the oil level goes down in the transformer, emptying the conservator, then also lower float will operate tripping the transformer.