TRANSFORMER PROTECTOR (TP) :
TPA with VDS and SOGST
TRANSFORMER PROTECTOR (TP)
Principles
The TRANSFORMER PROTECTOR is a transformer explosion and fire prevention system suitable for any type of oil-immersed transformer, On Load Tap Changer (OLTC), Oil Cable Box (OCB), and Oil Bushing Cable Box (OBCB). The TRANSFORMER PROTECTOR is suitable for transformers from 0.1 MVA up to 1,000 MVA and above.
It serves to:
•
Depressurize tanks
within milliseconds
•
Avoid contact between air (oxygen)
and the evacuated explosive gases
(primarily
acetylene)
•
Separate gases from the oil
•
Channel the flammable gases
away from the transformer to
a safe location
•
Eliminate explosive gases in
the transformer by injecting
an inert medium (nitrogen) into
the transformer and associated
equipment
•
Quickly bring the transformer
to a safe condition
•
Minimize the danger to responding
plant personnel and fire fighters
•
Eliminate oil spills and possible
contamination of ground water
and waterways
•
Minimize secondary damage to
the transformer and associated
equipment and provide a repairable
piece of equipment
•
Minimize the downtime associated
with transformer replacement
•
Minimize the high costs associated
with purchasing replacement power
•
Minimize or eliminate disastrous
public relations issues
During a transformer short-circuit, the TRANSFORMER PROTECTOR, is activated within milliseconds by the first dynamic pressure peak of the shock wave, avoiding transformer explosion before static pressure increases.
1-2
Depressurization
Set
All Depressurization Sets include a Rupture Disk to relieve over pressure created during a short-circuit. and a Decompression Chamber to assure high-speed depressurization. The size of the Depressurization Set components are calculated for each transformer. The configuration takes into account the design of the transformer,protecting the transformer tank, On-Load Tap Changer (OLTC), Oil Cable Box (OCB), and Oil Bushing Cable Box (OBCB).
A -
Isolation Valve B- Shock
Absorber C-
Rupture Disk D-
Decompression Chamber
3-5
Oil-Gas Separation Tank and Explosive Gas Evacuation Set
After TP Activation, the Oil-Gas Separation Tank (3) will collect and separate the explosive gases and oil. The gases are then channeled through the Explosive Gas Evacuation Pipe to a safe location.
6-7 Inert Gas Injection Set
After the TP Activation, the Inert Gas Injection Set will inject inert gas into the transformer. The inert gas will channel the explosive gases to a remote area, prevents air (oxygen) from coming into contact with the self-flammable gases, and further cools down the transformer.
8
Control Box
The Control Box defines the TP's operation logic and is the monitoring device of the entire TP. The Control Box will be located in the Plant Control Room.
CAUTION
TPC
does not recommend to limit the
amount of conventional mechanical
or electrical protection devices
when the Transformer Protector
is used.
