Transformer monitoring compared

Technical data of the 4 units of this type offered by Amperis, row by row. Tick «Compare» on two or three to see them side by side, copy the link or print the comparison.

Transformer monitoring compared

	Dynamic Ratings B100 Electronic Temperature Monitor (ETM)	Dynamic Ratings C50 Bushing Monitor	Dynamic Ratings E3 Transformer Monitor	GRIDSCAN5000 hydrogen sensor
Designed for	Electronic temperature monitor (ETM) for distribution, transmission and generation transformers; replaces up to 5 mechanical gauges; cooling control	Bushing and condition monitor for high-voltage transformers (bushings ≥ 69 kV): bushings, OLTC, cooling, partial discharge and dissolved gas	Continuous condition monitoring of power transformers: bushings, windings, OLTC, cooling, oil and insulation	Continuous measurement of hydrogen dissolved in the oil of power and distribution transformers; no calibration or consumables
Measured variables	Top-oil and tap-changer oil temperature; load current; hot spot of up to 3 windings (calculated); tap-changer Delta T	Power factor and capacitance of up to 6 bushings; top oil, ambient and load; hot spot and thermal ageing; OLTC: tap position, motor current and voltage, Delta T; cooling: fan/pump current, contactor, oil flow	Top oil, winding (fibre optic), insulation ageing Bushings: power factor and capacitance change, PD Harmonics, load profile and power factor, voltage; faults; GIC OLTC: tap counter, contact wear, motor Cooling, oil level, conservator, nitrogen pressure	H₂ 25 – 5000 ppm; accuracy ±20 % or ±25 ppm; repeatability ±10 % or ±15 ppm; response < 60 min; cross-sensitivity < 2 %; 1-year data log
Connectivity and control	DNP3, Modbus, IEC 61850; copper/fibre Ethernet, RS-485; USB; built-in web dashboard; optional communication over power wiring	DNP3, Modbus, IEC 61850; copper/fibre Ethernet, RS-232/RS-485; web dashboard	Multiple SCADA connections; USB; copper/fibre Ethernet; RS-232, RS-485 and serial fibre optic; e-mail notifications; built-in web pages	2-wire RS-485; Modbus RTU and DNP3; 19,200 baud, 8N1
Detected gases	Optional hydrogen and/or moisture sensor	Serial integration of external multi-gas DGA and moisture analysers	Key-gas and multi-gas DGA and moisture, via serial integration of external analysers	Dissolved hydrogen (H₂); mineral oil, silicone, natural and synthetic ester
Voltage and current inputs	2 Pt100 RTDs; 3 current (CT) inputs for load; 1 digital input	Up to 6 bushing sensors (sum of currents or voltage reference); up to 15 PD channels (tap sensors, RFCT, Rogowski coils); optional winding fibre-optic probe	Up to 12 modules Digital inputs: 12 per module, 2.5 kV AC isolation Analog: 6 per module (2 AC current, 2 three-wire PT100 RTD, 2 DC 0 – 1 mA, 4 – 20 mA or 0 – 10 V) Fibre-optic hot-spot probes Multiport: OLTC motor current, dual CT, dual PT100	Not stated on the product page
Outputs and alarms	6 digital relays; 2 analog outputs; 1 system alarm relay; configurable alarm, trip and cooling	Staged cooling control; essential tap-changer voltage control	8 form C contacts per module (NO/NC), 6 A @ 250 V AC / 6 A @ 30 V DC; 8 × 4 – 20 mA outputs (±0.2 %); common, major and minor alarms; cooling and voltage control	4 – 20 mA with optional module
Standards	Not stated on the product page	Not stated on the product page	IEC 60664: overvoltage category II (power input) and I (digital inputs/outputs)	CE; FM 6520:2022 (liquid phase); RoHS 2011/65/EU; IEC 61010-1; IEC 61326; IEC 60529; IEC 60068
Power supply	48 – 240 V DC or 110 – 240 V AC, 50/60 Hz	110 – 240 V DC or 110 – 250 V AC	48 – 275 V DC; 60 – 265 V AC, 47 – 63 Hz; 50 W Auxiliary output 24 V DC (18 – 32 V), 0.5 A	12 – 48 V DC; 10 W max.
Operating conditions	-40 – +70 °C; IP66/NEMA 4	-40 – +70 °C	-40 – 80 °C; humidity up to 95 % non-condensing	Ambient -40 – 70 °C; oil -40 – 105 °C; IP68; C5M corrosion class; 30 g shock
Format	Cast-aluminium outdoor enclosure; 287 × 296 × 129 mm; M20/M25 cable entries; backlit LCD	DIN rail, panel or 19″ rack	Modular, 35 mm DIN rail; numbered pluggable terminals; modules 166.87 mm high × 50.80 or 76.20 mm wide × 105.66 mm deep	Sensor screwed into a tank valve, 3/4″-14 NPT thread; 4-wire M12 connector; 151 × 39.6 × 39.6 mm
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