08/08/2026
การทดสอบ DC Winding Resistance ใน Transformer
Transformer เป็นโหลดแบบ Inductance เครื่องวัด Winding Resistance จะต้องจ่ายกระแสได้ต่อเนื่อง จนกระทั่งเกิด Saturated Magnetic Flux หรือ แกนเหล็กอิ่มตัว จึงจะอ่านค่า แรงดัน มาคำนวนค่า Winding Resistance
DC resistance measurement is a key diagnostic test for transformer windings, used to evaluate:
▪️Winding continuity
▪️Contact integrity
▪️Connection quality
▪️Early signs of deformation or overheating
⚡ What happens during the test?
When a DC current is injected into a transformer winding, the winding’s inductance causes a transient response. During this phase, the measured voltage (and calculated resistance) may fluctuate and should not be recorded.
📉 As the magnetic circuit saturates and the transient decays, the voltage stabilizes. Only at this steady-state condition does the measured DC resistance represent the true winding resistance.
🛠️ Why this matters:
▪️Recording values too early leads to incorrect resistance readings
▪️Comparing unstable values can mask real winding problems
▪️Accurate timing ensures repeatable and comparable results over time
🌠 With Vebko testing solutions, engineers can:
☑️ Control DC current injection precisely
☑️ Monitor transient and steady-state behavior clearly
☑️ Capture resistance values at the right moment
☑️ Perform reliable commissioning and maintenance tests
Because accurate diagnostics start with correct measurement principles.
Vebko, built for engineers who measure with understanding🖤
