Bucholz relay
Download as PPTX, PDF2 likes669 views
The document summarizes the Buchholz relay, which is a protection relay used on oil-immersed transformers over 500 kVA. It detects faults through changes in oil and gas levels between the transformer's main and conservator tanks. The Buchholz relay can detect minor internal faults like insulation failures or core heating, as well as major faults such as short circuits. It provides the benefits of early fault detection to prevent equipment damage and allows analysis of fault severity without dismantling. However, it only detects submerged faults and has a slow operating speed of 0.1 to 0.2 seconds.
1 of 11
Downloaded 46 times
Bucholz relay
- 1. Submitted by:- Bhavesh Manghnani(16EE50) Submitted to:- MR. DEV PRATAP MAHTO Topic:-BUCHHOLZ RELAY
- 2. INTRODUCTION BASIC CONSTRUCTION OPERATION Types of fault ADVANTAGES DISADVANTGES
- 3. Buchholz relay is a type of oil and gas actuated protection relay universally used on all oil immersed transformers having rating more than 500 kVA. Buchholz relay located between the conservator tank and main tank of transformer. Which energised an alarm circuit and trip circuit during transformer faulty condition.
- 7. Minor Internal Faults Insulation faults between turns. Breakdown of core of transformer. Core heating. Major or Severe Faults Short circuit between phases. Short circuit between phases to earth. Fault in tap changing equipment.
- 10. Advantages of Buchholz relay Buchholz relay indicates inter turn faults and faults due to heating of core and helps in the avoidance of severe faults. Nature and severity of fault can be determined without dismantling the transformer by testing the air samples. Limitation of Buchholz relay It can sense the faults occurring below the oil level only. The relay is slow and has a minimum operating range of 0.1second and an average operating range of 0.2 seconds.
- 11. THANKYOU!!