Answer / sanskar

Difference between Buchholz Relay and Oil Surge Realy:
Generally there is confusion between operation of Buchholz relay and Oil surge relay.

So, Let me interpret the major differences between them.

Buchholz Relay
Oil Surge Realy
Buchholz relay is used for protection of oil filled transformers/reactors fitted with conservators against low oil level and internal faults.
OSR is used to report any malfunction developed inside the On Load Tap Changer Chamber.
Buchholz relay is Gas actuated Relay.
OSR is Oil actuated Relay.
Buchholz relay should be mounted in the connecting pipe between the transformer and conservator tank.
OSR is installed in the pipe between OLTC head and the oil conservator.
Buchholz relay is actuated by the gases flowing through and accumulated in relay.
OSR relay is actuated when the flow rate of oil exceeds the preset value.
Buchholz relay detects the fall in oil level due to formation of gases after any internal fault inside the transformer.
OSR detects excessive oil surge after any fault occurs inside OLTC Chamber.

what could be the possible reasons for copper cable to have low insualation?

1 Answers  

---

How to do the REF Stability test for power transformers in Site?

1 Answers   Escorts, Siemens,

---

hi i m going to attend bhel interview on 22nd sep 2008 for ET(electrical engineering).pls guide me how to prepare for the interview.i am a fresher.

1 Answers   Bhel,

---

what is FET

1 Answers  

---

write a program that prints prime numbers from 1-20 in digonal form

0 Answers  

---

---

what is the difference between earth and neutral?

56 Answers   Bhel, Emerson, HCL, JLL, L&T, Siemens, TVS,

---

what is DRP panels?

0 Answers   SECL,

---

what is under coal gassification?

0 Answers  

---

hai friends i have BSNL JTO exam on next month so if any body have model question paper or give preparation tips to my mail id kumar4486@yahoo.co.in this will helpfull for my future .plz & thank u by kumar

0 Answers  

---

what is the working principle of smoke detector in fire alarm system

2 Answers   Vijaya Bank,

---

whether Transformer is singly excited or doubly excited machine?

2 Answers  

---

Why 9KV surge arrester having 7.65KV of MCOV?

0 Answers  

---