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APPENDIX A
Technical specifications
Description
Dissolved gas analysis (DGA) of transformer oil is a recognized detection method for incipient
transformer faults. The CoreSense complements off-line lab DGA by providing real-time continuous
monitoring of hydrogen and moisture levels in transformer oil.
The CoreSense can also monitor additional parameters provided by external sensors connected to
optional analog inputs. The CoreSense provides a simple local indicator based on three LEDs that allow
the condition of transformers to be determined at a glance, e.g., if the three LEDs are green everything
is normal. All of the readings made by the CoreSense are also available on the built-in web interface and
published through analog outputs and through digital protocols such as Modbus, DNP3 and IEC61850.
Measurement specifications
Hydrogen
Technology Solid state electrochemical palladium-based sensor
Hydrogen measurement range
Hydrogen measurement accuracy ±25 ppm or ±20%, whichever is higher
Hydrogen measurement repeatability H
2
±15 ppm or ±10%, whichever is higher
Hydrogen response time T90 (typical): 30 minutes
T90 (max): 60 minutes
Moisture (optional)
Technology Thin-film capacitive type sensor immersed in mineral insulating oil
Moisture measurement range 0 to 1 aw (configurable in aw, RH%, and ppm)
Moisture measurement accuracy ±0.02 aw
Temperature measurement accuracy ±0.2 °C
Mechanical specifications
Dimensions 392 × 264 × 158 mm (14.43 × 10.39 × 6.2 in)
Weight 8 kg (18 lbs)
Interface to transformer 1.5 NPT, male thread
Enclosure IP67/NEMA 4X enclosure
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