Abstract
The paper presents a prototype system for speed control of cooling fans for a small oil-immersed 6.6 kVA transformer, implemented on a standard PLC. Generally, the potential for optimization of the cooling process depends on the accessible cooling modes and construction of the transformer; basically the aim of the cooling system control is reduction in power consumption of the fans / pumps and keeping the top-oil temperature at constant value (to reduce transformer 'breathing' and infiltration of moisture). The following constraints should be taken into account: hot-spot temperature, its current value and the one which would appear for planned overloads must not exceed the allowed limit. Based on the results in steady state, the paper offers the quantitative determination of transformer thermal characteristics depending on the fan speed.
Highlights
Porasti temperature najtoplije tačke namotaja za radne tačke iz tabele 5
Based on the results in steady state, the paper offers the quantitative determination of transformer thermal characteristics depending on the fan speed
Summary
Određivanje zavisnosti toplotnih provodnosti od temperature/brzine strujanja fluida se može odrediti korišćenjem softvera baziranog na detaljnom termohidrauličkom modelu [4], na način sličan onome koji je korišćen u [5]. Koja je primenjena u ovom radu, je da se parametri u funkcionalnim zavisnostima toplotne provodnosti odrede iz rezultata merenja na transformatoru
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