Answer / abbeer

Each of the fault result in thermal degradation of the oil
either alone or in combination with paper insulation. This
gives rise to the evaluation of various hydrocarbon gases,
hydrogen and oxides of carbon, in quantities depending on
the type of fault.

Heavy current arcing is characterized by the evolution of
significant quantities of hydrogen and acetylene (C2H2). If
the arcing also involves paper insulation, the oxide of
carbon will also be present.

Partial discharge usually results in evolution of hydrogen
and lower order hydrocarbons.

Localized heating or hot spot gives rise to methane and
ethane in appreciable amount.

Prolonged overloading or impaired heat transfer can cause
CO and CO2 to be generated due overheating paper
insulation.

Answer / br

carbondioxid

Answer / jt

ozone

Answer / mo

nitrozne

Answer / arunava

Hydrogen
O2
N2
Methane
CO
Ethane
CO2
Ethylene
Acetylene any of these.

why it is not advisable to run low rating (19KVA) DG sets in parallel for long durations even though they are provided with droop ckts (QDC)

0 Answers  

Connection diagram for KW meter and  Kva meter

0 Answers  

Whether should be the oil level in OCTC transfomer? It should be upto winding immersed completely or should be upto tap changer s/w? How it will affect the performance of the transformer. Rating may be 33KVA

0 Answers  

Three set (each phase contain 2 cable of 400 mmsq CU XLPE AWA) of single core cables are connected to 11 KV motor of 14 MW & the switch gear supplay is taken from 11kv feeder & this supplay taken from 275 KV substation. Problem is one pair cable(L3- 2 cable ) getting very hot & gland melted and damaged in switch gear side. the other two cable haven't any more hot(ambient temp only & L3 haveing 95- 100 Degree C. The same problem happened in 275 KV substation switch gear side also where the supply taken for 11 kv switch gear. But here L2 phese cable had problem. Why it is happening like this?. The cable having temperature different at different location from gland side inthe case of 11KV feeder of 275 kv substation. why ?

2 Answers  

pf of synchronius motor is unity, is it axact(=one) value. ?

1 Answers  

i am going to give the JSEB,RANCHI exam for power plant,so i need some samples of papers related to that,so please send me these papers by my mail id.

0 Answers  

diff.between servo motor and ac motor

0 Answers   Power Grid,

What is the meaning of HT Trivector Meter ?

0 Answers   NIIT, Sodexo,

How power factor of electric system improved?

6 Answers   Nalco,

how did i get the competency certificate as electricle supervisor. iam completed my b.tech.but i dnt have any experince, this certificate is required for applyng ongc mangement trainees. what should i do sir please suggested me

0 Answers   ONGC,

For a DY11 lighting Transformer on primary side whee to connect fourth lead? from nuetral or from ground?

3 Answers   Sabic,

What is a thermocouple, and it working principle?

2 Answers