In buchholz relay how the top and bottom mercury switches are connected?

In buchholz relay how the top and bottom mercury switches are connected?
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1 Answer

Answer :

Top mercury switch is connected for alarm and bottom switch for trip.
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In buchholz relay how the top and bottom mercury switches are connected?

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Where is buchholz relay located?

Description : Where is buchholz relay located?

Last Answer : It is located between transformer tank and conservator.

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Last Answer : It protects the transformer from their internal faults like earth faults, winding short circuit, short circuit between phases, Puncture of bushing etc..

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What are the limitations of Buchholz relay?

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Last Answer : Construction of Buchholz Relay: It takes the form of a domed vessel placed in the connecting pipe between the main tank and the conservator. The device has two elements. The upper element ... manner that it senses the sudden violent movement of oil/gas from transformer tank to conservator. 

Explain Buchholz relay with neat labelled diagram.

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How to connect two single phase transformer to give three phase o/p from a three phase I/p ?

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What advantage has the star connection over the delta connection ?

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What is the advantage is obtained in the delta connection ?

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What is the 3 ph transformer ?

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What parameters or technical particulars are important to be considered while designing protection scheme of the transformer?

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What can be the reasons for the failure of the transformer?

Description : What can be the reasons for the failure of the transformer?

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How Transformer Protection provided for internal faults?

Description : How Transformer Protection provided for internal faults?

Last Answer : 1.Bucholz Relay (1st Stage Alarm and 2nd Stage Trip) 2.Sudden Pressure Relay (1st Stage Alarm and 2nd Stage Trip) 3.Pressure Relief Valve (1st Stage Alarm and 2nd Stage Trip) 4.Pressure Switch ... 8.Gas Temperature Indicator (Alarm) 9.Silicon Breather (Passive - no alarm) 10.Smoke Detector (Alarm)

What are the tests done to minimize internal faults?

Description : What are the tests done to minimize internal faults?

Last Answer : 1.Dissolved Gas Analysis (DGA): Faults due to arcing, high current breakdown of oil, localized sparking, partial discharge of oil, localized overheating or hot spots, etc. causes ... Over current relays with under voltage blocking 6.Zero sequence protection. 7.Negative phase sequence protection

What are the reasons for Oil degradation?

Description : What are the reasons for Oil degradation?

Last Answer : 1.Degradation 2.Oxidation 3.Contamination a) Dielectric breakdown voltage indicates the presence of electrically conductive contaminants in oil. b) Interfacial tension and acid number (sometimes called ... c) Water content is temperature dependent. d) Power factor is also temperature dependent.

How does change in frequency affect the operation of a given transformer?

Description : How does change in frequency affect the operation of a given transformer?

Last Answer : a) Iron loss .........increases with a decrease in frequency. A 60-Hz transformer will have nearly 11% higher losses when worked on 50Hz instead of 60 Hz. However, when a 25-Hz ... ....since total loss is greater at a lower frequency, the temperature is increased with decrease in frequency.

What effects are produced by change in voltage?

Description : What effects are produced by change in voltage?

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Does the transformer draw any current when its secondary is open?

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In practice, what determines the thickness of the laminate or stampings?

Description : In practice, what determines the thickness of the laminate or stampings?

Last Answer : Frequency.

How can eddy current loss be minimized?

Description : How can eddy current loss be minimized?

Last Answer : By laminating the core.

Mention the factors on which hysteresis loss depends?

Description : Mention the factors on which hysteresis loss depends?

Last Answer : (i) Quality and amount of iron in the core (ii) Flux density and (iii) Frequency.