DIRANA - The fastest way of moisture determination of power- and instrument transformers and condition assessment of rotating machines
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DIRANA The fastest way of moisture determination of power and instrument transformers and condition assessment of rotating machines

DIRANA – the fastest way of dielectric Moisture reduces the lifetime of transformers For power transformers, the moisture content is one of the most important parameters determining the remaining lifetime. Moisture in oil-paper insulated power and instrument transformers is caused by paper aging or enters the transformer via leaky seals or breathing. It leads to a reduced breakdown strength and an accelerated aging of the insulation. Knowing the moisture content enables you to perform condition based maintenance which reduces failures and avoids unnecessary replacements. Additionally, it...

moisture analysis Applications One measurement – many valuable results With DIRANA you can analyze the water content in different kind of cellulose insulation. You can test assets filled with mineral oil, natural and synthetic ester as well as air or vacuum. Commonly tested assets are: A single DIRANA measurement does not only provide you with the water content and oil conductivity of the asset, but also delivers many more valuable parameters such as: >> Power/dissipation factor at line frequency Additionally, dielectric measurement is available for diagnosis of other types of assets, such...

Dielectric frequency response (DFR) analysis How does DFR work? The very low frequencies contain information on moisture in the solid insulation, while the position of the slope in the mid-range frequencies indicates the conductivity of the liquid insulation. This curve is automatically compared to model curves and the moisture content of the cellulose insulation is calculated. The main amount of cellulose insulation in the active part of a transformer is located between the primary and secondary winding. To measure this insulation, the output is connected to the high-voltage winding and...

Result analysis and assessment Combining advantages A DFR measurement doesn’t only provide you with a power/dissipation factor value at line frequency with comparable accuracy to a high-voltage test set. It also enables you to determine if a high value is caused by water, bad oil and the bushings or if further factors such as soot, corrosive sulphur or localized carbonized spots may be the cause. DIRANA uses the two measurement methods FDS and PDC+ and combines their advantages: Frequency Domain Spectroscopy (FDS) is fast and accurate in the high frequency range up to 0.1 Hz but slow at low...

Innovative measurements with DIRANA The shortest measurement time – always Lowest testing frequency in the market The patented principle of combining FDS for high frequencies and PDC+ for low frequencies enables testing over a wide frequency range in an extremely short time. Due to DIRANA’s innovative measurement concept you can perform high precision measurements down to 10 µHz which is the lowest frequency range available for transformer analysis. This ensures accurate measurements for all assets, even new transformers with very low oil conductivity or an empty tank. Thereby, DIRANA’s...

Reliable assessment Thus, DIRANA reliably detects moisture even in aged oilpaper insulation. The automatic evaluation is conducted according to national, international or user defined standards. DIRANA uses a scientifically proven method to determine the moisture content. The comparison of the measurement to a built in database is performed completely automatically by the software, you only need to enter the oil temperature value. The automated assessment function compensates for influences such as temperature, insulation geometry, oil conductivity and aging byproducts. DIRANA measurement...

Step by step through the test procedure with Primary Test ManagerTM Management of location, asset and test data PTM provides a well-structured database for managing not only DIRANA data but all electrical and chemical transformer test results to get a comprehensive overview of your asset’s condition. DIRANA is operated by the Primary Test Manager tool for the diagnostic testing and condition assessment of your power and instrument You can define and manage locations, assets, jobs and reports in an easy and fast way. All electrical transformer tests can be configured, executed and managed...

(PTM) Easy connection and operation Result analysis and reporting From the information on the asset’s nameplate data, the optimal measurement setup is derived. Pre-configured wiring diagrams assist you with setting up the test equipment in the correct manner. DIRANA automatically performs the moisture and oil analysis once the test is finished. The results are then categorized according to national or international standards or to custom settings. This minimizes the likelihood of measurement errors and speeds up your testing process. Comparison tools for detailed analysis For a detailed...

Technical data Technical data Voltage source Typical measuring time (FDS & PDC+) Measurement voltage Maximum continuous output current 30 minutes - 1 hour 44 minutes Power/dissipation factor, capacitance Mechanical data / supply voltage Dissipation factor range 2.3 kg / 5 lbs (without measuring cables) Supply voltage Time domain current measurement (PDC+) Range Accuracy Environmental conditions Ambient temperature in operation for storage Frequency Domain Spectroscopy (FDS) Measurement voltage Frequency ranges For capacitances > 100 µF using default settings PDC+ frequency range FDS & PDC+...

Ordering information DIRANA ordering information Packages DIRANA comes in a rugged case which contains all necessary accessories such as 18 m long connection cables with clamps, drums etc. and the operating software Primary Test ManagerTM Optional Software Module ‘PTM DataSync‘ Separate module for data synchronization and back-up: For up to 3 users For up to 10 users For up to 25 users Upgrade for 1 user