Comprehensive Guide to Transformer Testing Instruments: Accurate Diagnosis to Ensure Power Equipment Safety

Transformer testing requires the use of various specialized instruments to assess electrical performance, insulation status, oil quality, and more. Below are common categories of transformer testing instruments and their functions:1. Transformer Turns Ratio TesterFunction: Measures winding turns ratio, polarity, and connection groupUsage: Checks for inter-turn short circuits and poor contact in tap changers2. Transformer DC Resistance TesterFunction:Measures winding DC resistanceUsage:Determines winding open circuits, poor contacts, or welding defects3. Winding Deformation Tester (Frequency Response Method/Short-Circuit Impedance Method)Function:Analyzes mechanical deformation and displacement of windingsUsage:Diagnoses winding conditions after short-circuit impacts4. On-load Tap Changer TesterFunction:Detects switching time, contact wear, and dynamic resistanceUsage:Prevents tap changer jamming or arc erosion5. Insulation Resistance TesterFunction:Measures insulation resistance between windings/core and groundUsage:Assesses moisture or aging levels6. Dielectric Loss TesterFunction:Detects insulation dielectric loss angle and capacitance valueUsage:Determines deterioration of oil-paper insulation7. Power Frequency Withstand Voltage Test DeviceFunction:Applies high voltage (e.g., 35kV) to test insulation strengthUsage:Assesses insulation performance of oil productsAnd so onTransformers are the core equipment of power systems, and their operating status directly affects power supply reliability. Scientific maintenance not only extends service life but also prevents failures and reduces the risk of power outages.Accurate testing = Early warning + Extended lifespan!– Recognize and Focus –Integrity FirstConsistency