Power Transformers

​Online Monitoring of Hydrogen and Moisture in ​Oil of Power Transformers

Power transformers are critical components in any electricity grid. Age, increased load levels, and network failures all take their toll on transformers, leading to an increased risk of unpredictable faults and outages.

Online and real-time condition monitoring of power transformers can keep them operating safely and with maximum efficiency, while supporting the planning of timely maintenance actions that can extend operational lifetime and prevent unexpected and costly outages.

Moisture reduces the insulating properties of transformer oil, resulting in more rapid aging of the transformer. Traditionally, oil moisture readings have been taken at periodic intervals. However, because moisture levels can change rapidly, periodic sampling is not sufficient.

Dissolved gas levels in transformer oil indicate the existence of a fault and the rate of change in these levels is used to determine its severity.​

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MHT410 Moisture, Hydrogen and Temperature Transmitter for Online Transformer Condition Monitoring

MHT410 Moisture, Hydrogen and Temperature Transmitter for Online Transformer Condition Monitoring

The Vaisala Moisture, Hydrogen and Temperature Transmitter MHT410 for Transformer Oil measures directly from representative transformer oil giving both reliable hydrogen trend as well as fast moisture data.


The Vaisala Optimus™ OPT100 DGA Monitor for Transformers

The Vaisala Optimus™ OPT100 DGA Monitor for Transformers

The Vaisala Optimus OPT100 DGA Monitor for Transformers gives you out of the box performance, completely eliminates false alarms, and offers the best long-term stable measurements of any device on the market – all with no maintenance. ​


Vaisala HUMICAP® Moisture and Temperature Transmitter Series for Oil MMT330

Vaisala HUMICAP® Moisture and Temperature Transmitter Series for Oil MMT330

New intelligence for continuous on-line measurement of moisture in oil. Versatile configuration options including graphical trend display with 1-year history. Optional data logging and (W)LAN interface.


Vaisala HUMICAP® Moisture and Temperature Transmitter Series for Oil MMT310

Vaisala HUMICAP® Moisture and Temperature Transmitter Series for Oil MMT310

A compact, module-type transmitter for lubrication, hydraulic and transformer oils. Ideal for OEM system integrations.


Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil MMT162

Vaisala HUMICAP® Moisture and Temperature Transmitter for Oil MMT162

Your accurate economical solution for on-line detection of moisture in oil. Lubrication systems, hydraulic systems and transformers are among its typical applications.


Vaisala HUMICAP® Hand-held Moisture Meter for Oil MM70

Vaisala HUMICAP® Hand-held Moisture Meter for Oil MM70

Designed for fast and easy on-site checking and transmitter calibrations. Graphical display, data logging and data transfer to PC.


Vaisala DRYCAP® Dewpoint and Temperature Transmitter Series DMT340

Vaisala DRYCAP® Dewpoint and Temperature Transmitter Series DMT340

Designed for industrial low dew point measurements below 10% (RH). Ideal for dry air monitoring and plastic dryers. Optional data logging and (W)LAN interface.


Vaisala DRYCAP® Dewpoint Transmitter DMT152

Vaisala DRYCAP® Dewpoint Transmitter DMT152

The recently updated DTM152 is designed for measuring low dew point in OEM applications, even down to -80 °C.


Vaisala DRYCAP® Hand-Held Dewpoint Meter DM70

Vaisala DRYCAP® Hand-Held Dewpoint Meter DM70

Provides accurate readings in a wide measurement range. Designed for on-site checking of fixed low dew point transmitters.