Nitrogen Injection Fire Prevention & Extinguishing System protects transformers from fire and blast occurred from both internal and external faults.
In case of fault happened inside the transformer due to arcing, in core and coil dielectric interruption, ruptures and twist of the winding, improper grounding etc., our PLC based NIFPES system receives internal inherent faults / feedback / trip signals from transformer panel and system will activate to prevent the transformer from fire.
External fire can erupts due to OLTC, oil leaks, gasket rupture, bushing failure, weld cord, defects of forced cooling fans, Buchholz Relay, exit of the current transformers of the bushings, bursting of bushings, improper / loosening of cable terminations, faults in transmission lines etc .
We used highly sophisticated hollow-metallic tube based linear heat detection system. Our PLC based NIFPS system receives the data from signal junction box to activate the NIFPES.
Basic Principle
DRAIN -To reduce fuel volume and create space to avoid development of abnormal pressure inside the transformer tank which can lead to rupture of tank.
STIR -Nitrogen is injected form the bottom to stir the oil and bring down temperature of oil below flash point. This also creates at top Nitrogen blanket which prevents Oxygen to come in contact with hot oil.
Heat sensing mechanism – The temperature of oil is measured by scanning entire top surface of transformer tank cover using linear heat sensing controller.
The Advantages of this sensor are
- Total top cover surface of transformer temperature is scanned on continuous bases.
- Two set of potential free contact permitting setting of alarm and trip command.
- We can set tripping of transformer much below flash point temperature after keeping reasonable margin for temporary over loading. In directly it is additional direct back up protection for IDMT relay.