Answer / arvind singh

There is not any technical name for the transformer oil,
its only the specification which made the crude oil to
transformer oil(insulating oil). Nepthanic oil, Peraphenic
oil, Mineral Oil (its the specification which process the
crude oil to the nepthane base for the cooling of
transformer which have various acceptance norms as
specified in IS:335 below
Sl No. Characteristics Requirement Method of test as
per latest revision of IS as indicated below
1. Appearance The oil shall be clear and
transparent and free from suspended matters/sediments A
representative sample of oil shall be examined in a 100 mm
thick layer at the ambient temperature
2. Density at 29.5 Deg. C. Max. 0.89 g/cm3
IS:1448[P:16]
3.
Kinematic Viscosity at 27oC Max. 27 cst
IS:1448[P:25]
4. Interfacial tension at 27oC Min. 0.04 N/m
IS:6104
5. Flash point Pensky Marten (closed),Min.
140oC IS:1448[P:21]
6. Pour point Max. -6 deg. C IS:1448[P:10]
7. Neutralisation value (Total acidity) Max.
0.03 mg KOH/G IS:1448 [P:2]
8. Corrosive Sulphur Non-corrosive IS:335
9. Electric Strength (breakdown voltage)
IS:6792
a) New unfiltered oil, Min. 30 kV (rms)
b) After filtration, Min. 60 kV (rms)
10. Dielectric dissipation factor (Tan delta) at 90º C,
max. 0.002 IS:6262
11. Specific resistance (resistivity)
IS:6103
a) at 90oC min. 150x1012 ohm-cm *
b) at 27oC min. 2500x1012 ohm-cm *
12. Oxidation stability IS:335
a) Neutralisation value after oxidation Max.
0.40 mg KOH/g
b) Total sludge value after oxidation Max.
0.10 percent by weight.
13. Presence of oxidation inhibitor present by weight
The oil shall not contain anti-oxidant additives
IS:13631
14. Water content maximum 50 ppm IS:13567
15. Aging characteristics after accelerated ageing
(open beaker method with copper catalyst)
IS:12177
Method A
a) Specific resistance (resistivity) Min.
IS:6103
1) at 27oC, Min. 4.5x1012 ohm-cm
2) at 90oC, Min. 0.2x1012 ohm-cm
b)Dielectric dissipation factor (Tan delta) at 90oC
Max.
0.20 IS:6262
c) Total acidity, Max. 0.05 mg KOH/gm IS:1448
[P:2]
d) Total sludge, Max. 0.05 percent by weight
Annex A of IS 12177
16. SK value, max. 4-8% volume increase IS : 335

Answer / ajit

Askarel

Answer / kamal

pure hydrocarbon minreral oil

Answer / maganti hari krisha

escral

Answer / gokulakrishnan

Transformer oil, or insulating oil, is usually a highly-
refined mineral oil that has excellent electrical insulating properties.

Answer / manoj

it is a byproduct petroleum oil.

Answer / nage

No such name but can you tell me what IP/ASTM/any other
thermometer is used to maintain 27 deg C of KV bath?

Answer / a k singh

Poly Chlorinated Biphenyl (PCB) or Askerials.

Answer / sanjeev

TRANSFORMER OIL NAME
TECHINICAL NAME IS CRUDE OIL' BUT
ACCORDING TO BOSS LUBRICANT' CANADA
THE CHEMICAL NAME OF THIS OIL IS
SEVERELY HYDROTREATED HEAVY NAPHTHNIC DISTILLATE(SHHNH)......
..;;;;;;;;;;;;;
:-)

Answer / thanigai1984

Electro mineral oil ...

What is resonant frequency?

0 Answers  

What is earth system using on the floater TN-S or TT. Iam not sure and what ICCP

0 Answers  

we all know that both the generator and motor are electromechanical conversion devices.....then why we rate motor in kw and generator in kva????

4 Answers   KSEB,

What is the disadventage of gland earthing(power cable) if any. ?

0 Answers  

I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase, before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???

1 Answers  

how the harmonic pluses take place in the flow of current

2 Answers  

HI,how to know that the MEGGER which i am using is working properly,reply....thankyou

2 Answers   NTPC,

what is ground clearence ,what is minimum ground clearence ,i.e present value following in india ,is it changes wit conductor size ,kva rating.surface

3 Answers  

what is difference between di electric and insulator?

2 Answers   Greenko,

different between grounding & earthing?

23 Answers   L&T,

HOW DO A DISTANCE RELAY SENSES THE FAULTY ZONE.

5 Answers  

is it possible for different brand of H.V transformers to run or operate in parallel to each other? if so how much disturbance can this affact the H.V bus bar?

0 Answers   Unitech,