News & Updates

Oil immersed transformer Hot-Spot Temperature (HST) models based on IEEE and IEC loading guides

Abstract This article introduces two models based on the IEEE [1] and IEC [2] loading guides to compute the HST of a transformer winding. The models are solved numerically using arbitrary load and top oil temperature profiles. The results are then compared to highlight relative characteristics of the models. Introduction The Transformer Loss of Life […]

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Technical note – MIRO Automatic FTP Uploads

This guide introduces how to setup an FTP system with automatic data uploads for the MIRO Power Quality Logger and Analyser. Introduction Purpose The FTP upload option provides automatic data collection without needing an application which periodically polls data to manage it. This has numerous advantages: Unsolicited reporting instead of polling allows for the device […]

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Over The Air Upgrade – Sierra Wireless HL7650 Modem

Updating the Firmware of the Miro’s Wireless 3G/4G HL7650 Modem Remotely, via the Sierra Wireless AirVantage Platform This guide illustrates how to update the firmware of the Miro instrument’s Sierra Wireless HL7650 modem remotely via the AirVantage platform, for the Miro instrument to be able to operate over Telstra’s upgraded 4G LTE network. The AirVantage […]

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An Introduction to Transformer Harmonic Current Derating Metrics

Abstract Transformer harmonic current derating metrics; Harmonic Loss Factor, K-Factor, and Factor K are introduced, and used to calculate derating factors for dry and oil-filled type transformers. Introduction The introduction of Switched Mode Power Supplies (SMPS) in office equipment and LED lighting, Variable Frequency/Speed Drives (VF/SDs) to operate induction motors, and inverters that change DC, […]

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Configuring the MIRO for cellular communications

This guide illustrates how to configure a MIRO Power Quality Logger and Analyser for cellular communications. Installing the SIM Step 1 : Unplug the MIRO from the all power sources (including the communications cable). The MIRO has a backup battery and will power down in five minutes if it was powered with a single phase […]

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Introduction to Transformer Loss of Life – based on models from IEC and IEEE loading guides

Abstract This work introduces the concepts of Hot-Spot Temperature (HST) and transformer ageing due to temperature and how the HST affects transformer life expectancy. The relative ageing rate of two models are compared for various scenarios and the Transformer Loss of Life (LoL) is estimated for two HST profiles. Introduction LoL is the term used […]

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Mirrin Firmware Release Notes

Mirrin firmware v1.20 (Updated 2022-08-01) Amended watchdog timer to cater to start up time of various modules. Ambient and surface temperature measurements interval now set to 2 seconds. Current sensor model F-6000 now supported

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Citrus Release Note

Citrus v.1.4.0.8 (Updated 2024-03-26) Enhanced Multi-parameter capture measurement. Support for Point Condition Monitor (Electric DC) Improved Configuration menu: feature restrictions for LCD pages (phasor diagram, power) Improved Online monitor: derived phase to phase channels on live RMS plot are shown only when applicable. Mirrin: max value and time when max value occur added to status […]

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Miro Firmware Release Notes

Miro Firmware v3.18 (Updated 2024-03-26) Updated phasor and quadrant power LCD pages Serria Wireless RC7620 modem support Additional DNP3 fundamental power parameters Additional MQTT fundamental power parameters Adjustment of LCD serial number position to avoid clashing with the signal bar Adjust ‘GPS’, ‘WiFi’ (low-speed), ‘TCP’, ‘SSH’ and ‘AUX’ text position on LCD to reduce overlap […]

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Citrus Release Note

Citrus v1.2.8.5 ( Updated 2021-03-05)Miro: Four Quadrant Power. Allows users to quickly determine real and reactive power flow direction (Import, Export) in real time. NEC 220.87 Connected Load Survey Report. Quick way to confirm if additional load can be added to an installation, and if it conforms to NEC 220.87 regulations. Support ‘percentage of fundamental’ […]

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