Dissolved Hydrogen and Water Monitor

Transformer Fault Monitor
Early Warning System

CALISTO is a simple and reliable system for detecting transformer incipient faults at their earliest stage. It provides unequaled stability at low concentration levels and is field installable in less than 2 hours. The monitor offers additional value through on-line monitoring of dissolved water and can be easily networked for monitoring entire sub-stations. Used in conjunction with other MSS products such as our Myrkos Portable Fault Gas Analyzer, CALISTO becomes a key element in managing critical transformers. 

The key to detecting incipient faults: Hydrogen monitoring

Most experts will agree that using hydrogen to diagnose the nature of transformer faults is not efficient. Then why bother monitoring it? Because hydrogen is a key fault gas that evolves in ALL types of faults. This and the fact that hydrogen has a very low solubility in oil make hydrogen a perfect gas for the early detection of a changing transformer condition. Users can then take appropriate actions and avoid unpredicted outages and loss of revenue.

Hydrogen comes first

Not only is hydrogen present in all transformer faults, it is also the gas appearing first when a problem is developing. This means that detection of hydrogen traces is the best way to find out that something is going on.

Plus, unlike most other gases, the generation rate of hydrogen increases proportionally to fault severity. The more serious the problem, the more hydrogen is generated! This behavior, coupled with the fact that hydrogen very rarely varies with load, makes it truly representative of the transformer status, at all times.

When Acetylene shows up and is detected in the transformer, it may already be too late to take action. By that time, very large amounts of hydrogen are usually generated at the fault location.

Calisto, through the monitoring of both dissolved hydrogen and moisture, allows you to assess transformer condition AND load. If a fault occurs you can then make the best possible decisions using easy to understand and reliable signals.

• The world’s most precise and accurate transformer gas monitor
• No interferences from other gases
• Built-in oil circulation pump for representative oil sampling
• Short and long term stability
• Water monitoring
• Designed and manufactured in Canada
• Customizable data management and communication solutions