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A Bucholz relay (device) is used where oil filled Transformers have an overhead Conservator tank (to allow for the oil expanding and contracting due to temperature rising & falling) This device is fitted on the pipe linking the transformer tank to the conservator tank. The entry point of this pipe to the transformer should be the highest point of the main tank thus collecting any gases generated within the transformer. The outgoing pipe to the conservator tank is close to the bottom of the Bucholz device so as to accommodate the accumulation of any gases. These gases can be be drawn out and analyzed to give some indication as to the health status of the transformer core. The Bucholz device has two windows so as to allow the presence of gas to be verified visually. A small amount of gas trapped here will cause an internal float to fall and this can initiate an alarm. A second sensor is an internal flap which allows modest flows of oil up and down as heating and cooling. However a large volume of oil being forced through this flap will activate the flap and this can signify an internal fault. This signal is usually used to trip the circuit breakers on both windings so as to isolate the transformer immediately and possibly limit the damage.
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What is the inclened angle of buchholz relay?
To enable any gases generated within the transformer to bubble along the pipe towards the expansion tank. The Buchholz relay itself isn't angled; it's the pipe in which its fitted.
Why buchholz relay is inclened at some angle?
The Buchholz relay is installed in an inclined position because of buoyancy. Slightly inclined so the gas bubbles will flow to the cover and then to the Buchholz relay and not stay in a pipe corner.
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).
What are the causes for decomposition of transformer oil and how is this detected?
A major cause of decomposition of transformer oil is minor arcing within the transformer. Decomposition results in gas which bubbles towards the top of the transformer and upward into the conservatory tank. Between the transformer and conservator tank is a Buchholz relay, in which this gas collects, causing a mercury switch inside a float to initiate an alarm in the substation. This gas can be collected through a small pipe feeding from the Buchholz relay in order to have it analysed.
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