IFD Performance Specifications
Activation Level
The IFD will activate with a minimum pressure rise of 0.5psi in 5-7ms.
This can represent a fault as low as 500A (varies depending on fault location in transformer).
Certification: Simulated symmetrical and asymmetrical internal faults from 500A
to 8000A. (Ref: CEA Technologies Report)
Operating Temperature Range
The IFD will operate between -40oF (-40oC) to +221oF
(+105oC).
Certification: Bench temperature cycling from -40oF(-40oC)
to +221oF(+105oC).
(Ref: CEA Technologies Report)
Visibility
The activated IFD is clearly visible from at least 60' (20m) during day or night.
Certification: Day and night visibility test (Ref: BC Research Inc.)
Lightning Impulse Test
IFD equipped transformer passed lightning impulse test at a level 16% above the rating.
Certification: Ref: CEA Technologies Report.
Quality Testing
Every IFD is individually tested in a calibrated chamber to ensure correct operation at the specified
activation level.
Standards
The IFD conforms to:
- American National Standards Institute - ANSI C57.12.20
- Canadian Standards Association - CSA/C2.2
Permanent Fault Indication
Once activated the IFD cannot be reset. The transformer must be removed from service.
Reliable Activation
The IFD will only activate during an internal fault in the transformer. The IFD will not activate
due to normal pressure changes within the transformer or external faults.
Certification: Ref: CEA Technologies Report.
Mechanical Vibration Tests
Tests on an IFD equipped transformer confirm that the signal will not activate during normal transformer
transport, handling and operating conditions.
Certification: Ref: CEA Technologies Report
Shipping Tests
The IFD is unaffected by shipping over a distance of 2500 miles (4000 km).
Certification: Ref: IFD Research and Development Group
Pressure Relief
The IFD is fitted with either a 5psi or 10psi Pressure Relief Device (customer
specified). The pressure relief device can also be manually operated.
Service Life
The IFD is manufactured from glass reinforced PBT for greater than 30 years service. The IFD requires
no maintenance during its service life.
Certification: Ref: CEA Technologies Report
Transformer Operation
The IFD is situated in the airspace above the maximum operating oil level and has no impact on the
normal operation of the transformer.
Certification: Ref: CEA Technologies Report
Certified Transformers
Suitable for installation in transformers having internal air space ranging from
452in3 (7,400cm3) to 2,906in3 (47,620cm3).
Certification: Ref: CEA Technologies Report.
For further information please see our FAQ
section or Contact Us. To
order the CEA Technologies Report please contact CEA
Technologies.
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