Sr. No. |
Existing NIFPES specification |
Proposed upgraded specification - transformer Fire and Explosion Prevention system. |
1 |
Nitrogen lnjection Fire Prevention
System (NIFPS) is neither "Type
Tested nor Live Tested"
|
Transformer Fire and Explosion Prevention System is Live Tested in International accredited Laboratory |
2 |
Only Mah Tank Protection is possiblel |
It Ensure Complete protection of the trasfomer |
3 |
Oil draining is dependent on Ihe
activating signals from Transfomer
electrical Protections |
Depressurisation is independent of activating signals from outside |
4 |
In case Transformer Eledtical Protections falls, lhe NIFPES System
fails |
It works on dynamic pressure rise wlthout depending
on inputs from extenal devices and hence,no chances of any failure
|
5 |
ln csse of Mal-operation of electrical
protection signals, High probability of
Mal-operation of NIFPES system as
well. |
Probability of Mal-operation is as Nil as it works on actual Pressure rise |
6 |
Minimum activation time requiled in
Prevsntion mode is 690ms as it
involves Ac{valing signals (Buchol! or
PRV. Differential, Master Trip),
Control Box relays, Electromagnet
and Butterfly valve |
Between 7 to 20 milisecond,It activates with first dynamic pressure peak of the shock avoiding transformer explosion before static pressure increases |
7 |
During depressurisation Process,
actual Oil Draining ls done and hence,
cover insulation level between Tank top
and winding level is reduce sharply which is very dangerous
undet breaker mechanical failure condition
|
During depressurisation. process, Oil is evacuted to a saparate tank called OGSI (Oil Gas Set) separation tank.)to saparate oil and gases. are then channelled away to a remote area After depressurisation, oil
flows back to the transformer tank. Hence, no oil is drained from the tank Therefore, No danger under breaker mechanical failure conditions.
|
8 |
Maximum 5 inches Oil draining area is Possible due to design limitation of NIFPES e.g for 240 MVA transformer, the depressurisation
section limited to 9,612 sq mm after considering obstruction
due to Butterfly valve inner element. |
Maximum 2 times l2 inches depressurization area is
Possible Which confirms that tha protection is possible
for all rating tranrforormers up to and including 1000MVA. E.g., for 240MVA Transformer, the depressurisation section available is 49,062 sq. mm (250mm) |
9 |
Inner butterfly element of Value used
in NIFPES further reduces the depressurisation area by 20%
(approx)of 5 inchs Oil draining area. |
No obstruction in oil flow during depressurisation process |
10 |
Oil draining valve (Butterfly valve) is available on the FEC only
which is usually kept 5Mtrs away from the transformer Main tank.Hence,Oil
draining process takes place at slowe rate |
Depressurisation set is fied at a distace of 250MM from transformer
Tank hence depressurisation takes place at the faster rate |
11 |
trarsformer may explode or
parmanent tank deformation happens
under internal short circuit |
Transformer will be saved without permanent tank deformation under short circuit |
12 |
Oil tank and subsequent civil works required |
Oil gas sepration tank (0.5 cubic meter) will be part of transformer manufacturing |
13 |
Chances for re-use of oil is very less |
No oil wastage happens |
14 |
High down time and human life risks |
time sharply reduces and no human risk |
15 |
No Live test concerning internal short circuits are performed |
62 Live test concerning internal short clrcuits are performed |
16 |
No intenational accredation |
Fast depressurization technology has been recommende by NFPA in codes 850 and 851. lt is complying wih Fast depressurization technology |
17 |
No research has been Pertormed |
More than 50 Scientific Publication since '1999' |
18 |
Responsibility lies on end user,Transformer Manufacturar and vender as it involves Transformer Accessories signal for prevention |
Responsibility lies only on the vendor as it involves no
transformer accessories signal for prevention |
19 |
No Liability insurance. Confidence
level on this protection is very low
|
Confidence level on this protection is very high and hence
the liability insurance to the extent of damages occured for at least INR 100 crore is offered in case of transformer explosion occure with the system installed and maintained. Beacouse of the efficiency of this
solution the insurance has never been used |
20 |
Life/Guarantee /Warranty of NIFPS
limited to 12 to 18 months' |
Each transformer is ensured for life times for this Guarantee /Warranty fitted with transformer fire and explosion prevention system |