Transformer Monitoring System Hydrocal

Transformer Monig System

Transformer Monitoring System

Drallim Industries Limited offers Transformer Monitoring System MTE’s range of products and solutions for online gas-in-oil monitoring of transformers (online DGA), Composite Gas-in-Oil Sensor with Moisture in Oil Measurement & Online Dissolved Gas Analysers. With individual and modular system components MTE Switzerland provides the optimal customer-oriented solutions for utilities, industries and transformer manufacturers. Analysis of the gases dissolved in power transformer oil is recognised as the most useful tool for early detection and diagnosis of incipient faults in transformers. The cost effectiveness of online dissolved gas analysis (DGA) is recognised worldwide. The data can assist with transformer maintenance, transformer asset management, transformer life extension and asset life extension. Composite or individual analysis of the key fault gases dissolved in power transformer oil provide early warning indication and initial fault classification.


The HYDROCAL 1001+ is a permanently installed composite gas-in-oil sensor for the analysis of the following dissolved key fault gases (TDCG = Total Dissolved Combustible Gases):

Fault Gas TDCG Contribution
Hydrogen (H2) approx. 20 %
Carbon Monoxide (CO) approx. 30 %
Methane (CH4) < 5 %
Acetylene (C2H2) 100 %
Ethylene (C2H4) approx. 32 %
Ethane (C2H6) < 5 %

To provide an even more comprehensive transformer monitoring solution, the HYDROCAL 1001+ analyses additionally the content of moisture (H2O) in the transformer oil.

The integration of 6 relevant key gases into a total weighted gas concentration and the measurement of Moisture in oil enables the HYDROCAL 1001+ to react to most transformer faults and makes the device to a compact and cost-effective tool used for early transformer fault detection and preventative maintenance.

The HYDROCAL 1001+ is equipped with 2 Analogue 0/4 … 20 mA outputs for the dissolved composite gas-in-oil and moisture in oil analysis results and 4 digital relay outputs (Hi-alarm, Hi-Hi-alarm, moisture-alarm and system function alarm).


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