Gurbin Winding Resistance Testing
Takaitaccen Wace Winding Resistance Test
Wace winding resistance test na transformer yana nufin kawo shahara ga aikace da kuma hanyoyi masu transformer tare da cikakken bayanai.
Dalilin Wace Winding Resistance Test
Wannan wace ta taimaka wajen mari I2R losses, faren winding, da kuma samun damar ko abin da ba daidai ba.
Hukumar Samun Bayanai
Don winding na star connected, zai samun resistance a kan line terminal da neutral terminal.
Don winding na star connected autotransformers, zai samun resistance na HV side a kan HV terminal da HV terminal, sannan a kan HV terminal da neutral.
Don winding na delta connected, zai samun resistance a kan pairs of line terminals. Saboda a cikin hukumomin delta bai iya samun resistance na winding mai suna daga cikin sakamako, resistance per winding zai rarraba a cikin formula:
Resistance per winding = 1.5 × Measured value
Zai samun resistance a faren ambient temperature kuma zai ci gaba a cikin resistance at 75°C don tushen da design values, past results, da kuma diagnostics.
Winding Resistance at standard temperature of 75°C
Rt = Winding resistance at temperature t
t = Faren winding
Bridge Method of Measurement of Winding Resistance
Prinsipin mafi inganci na bridge method shine tun zuwa hukumomi unknown resistance da known resistance. Idan currents masu flow through the arms of the bridge circuit suka samu balance, reading of galvanometer ya fi zero deflection, wannan na nufin a kan balanced condition ba zai flow current through the galvanometer.
Yawan resistance (a milli-ohms range) za a iya samun da ma'adani a cikin Kelvin bridge method, saboda hakan da value mafi yawa Wheatstone bridge method of resistance measurement zai amfani. A bridge method of measurement of winding resistance, errors suka rage.
Resistance measured by Kelvin bridge,
The resistance measured by Wheatstone bridge,
Key Considerations and Precautions
Test current ba zai iya haɗa da 15% of the winding’s rated current don sake rage da warming da changing resistance values.
