Buchholz Relay in Transformer (Part 1) ⤵️⤵️⤵️⤵️
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#Fact_of_the_day_EMNCFRW
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Buchholz Relay provides Mechanical Protection for Transformer. What is a Buchholz Relay?

1. It is a Oil and gas actuated Protection Relay for Mechanical Protection of the Transformer against incipient fault occurring inside the transformer, such as impulse breakdown of the insulating oil, insulation failure of turns etc.

2. It is placed in the pipe connecting transformer tank to the conservator.

3. It is generally used in large oil immersed transformers (rated more than 500 kVA).

How to test the Buchholz Relay ? (Part 2) ⤵️⤵️⤵️⤵️

1. Put the Buchholz relay in the Test Mode and short the alarm contacts and check if the annunciation is received in the control room, then short the tripping contact and check whether Trip command is issued to the breaker.

2. Inject air into the relay from the pet valve provided at the top of the relay, to simulate gas accumulation and check the alarm and tripping.

3. Drain the oil from the relay after closing the gate valves provided at both the sided of the relay in the connecting pipeline and check the annunciation and tripping.

What is the Working Principle of Buchholz Relay? (Part 3) ⤵️⤵️⤵️⤵️


1.Accumulation Of Gases : Whenever a fault occurs inside the transformer , such as Arcing, Partial Discharge, Insulation failure of turns breakdown of core or excess core heating, the fault is accompanied by production of excess heat. This excess heat decomposes the transformer insulating oil which results in production of gas which tends to flow in upward direction towards conservator and hence collected in the buchholz relay. These Gases accumulate in the upper part the Buchholz container which causes fall of oil level in it i.e. lowering the position of float and thereby tilting the mercury switch. The contacts of this mercury excess heat decomposes the transformer insulating oil which results in production of gas which tends to flow in upward direction towards conservator and hence collected in the buchholz relay.
These Gases accumulate in the upper part the Buchholz container which causes fall of oil level in it i.e. lowering the position of float and thereby tilting the mercury switch. The contacts of this mercury switch are closed and an alarm circuit energized.
2. Severe Winding Fault : In case of Serious Faults , there is high Oil flow from the main Transformer Tank to the Conservator. Switch is operated, and therby Tripping the Transformer.

Electrical Machine Network Circuit and Field Research World (EMNCFRW)

Nikola Tesla

Sir William Ramsay (Part 1)
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#Fact_of_the_day_EMNCFRW ⤵️⤵️⤵️⤵️

The 🏅Nobel Prize in ⚗️Chemistry 1904

🏡Born: 2 October 1852, Glasgow, 🏴󠁧󠁢󠁳󠁣󠁴󠁿Scotland

🪦Died: 23 July 1916, High Wycombe, 🇬🇧United Kingdom

Affiliation at the time of the award: University College, London, United Kingdom

🏅Prize motivation: “in recognition of his services in the discovery of the inert gaseous elements in air, and his determination of their place in the periodic system”

🏅Prize share: 1/1

(Source: nobelprize.org)

Life (Part 2)
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William Ramsay received his basic 📚education in 🏴󠁧󠁢󠁳󠁣󠁴󠁿Glasgow before traveling to 🇩🇪Germany to earn a doctorate in organic chemistry. At that time 🇩🇪Germany was the world leader in 🔬research, so Ramsay’s study path was not unusual. Eventually he became a professor at University College of London. After hearing a lecture by Lord Rayleigh, he began studying gases, which led to his discovery of noble gases. For their collaboration, Rayleigh and Ramsay each were awarded a 🏅Nobel Prize in the same year, in ⚛physics and ⚗chemistry respectively.

(Source: nobelprize.org)

Work (Part 3)
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The 🌫️air around us consists of several different 🌪️gases, mostly 🌫️nitrogen gas and 🌬️oxygen. Through weight comparisons between air and nitrogen gas formed in chemical processes, 👨‍🔬William Ramsay, along with 👨‍🔬Lord Rayleigh, showed in 1894 that air also contained an element ⁉️unknown up to then, which was given the name argon(Ar). It does not react with other elements but is a noble gas. After discovering another noble gas, helium, 👨‍🔬Ramsay predicted other noble gases based on the periodic table of elements and could establish the existence of 🟧neon, krypton and xenon.

(Source: nobelprize.org)