The combustible gases dissolved in the oil of high voltage equipment are known as being one of the best indicators of the internal status of the equipment and its insulation. The detection of abnormal gas levels can indicate the occurrence of failures still in incipient stages.

Tree Tech Model GMM
The Gas and Moisture Monitor (GMM) performs the online monitoring of the amount of hydrogen dissolved in insulating mineral oil, emitting alarms for hydrogen levels above the set limit and for elevated increases in gas levels.
 
The GMM measures the hydrogen content dissolved in the insulating oil, since this gas is present in most of the types of failures that occur in transformers. The GMM can also monitors the relative humidity in the oil and the associated oil temperature.
 
The Gas and Moisture Monitor is comprised of the Measurement "MM" and the "MMI" Modules. The Measurement Module is coupled to an oil valve in the transformer and contains the measurement sensors. It is provided with a RS-485 serial communication port through which information is transmitted to the MMI Module. The MMI makes the information locally available in its displays, remotely available through the analog outputs to dry contacts and through the RS-485 serial port. The MMI module also performs the calculations of trends and stores historical values in a non-volatile memory.
 
Dedicated versions only for gas measurement or only for moisture measurement are also available.
 

• Temperature Monitoring & Control

• Bag / Membrane Break Detector

• Circuit-Breaker Supervisor

• Tap Positioning and AVR

• Auxiliary I/O and Data Acquisition

• Annunciation & Event Station

• Bushing Condition Monitor

• Communications & Networking

• Software Applications