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Jul 16 2025

Why Do Transformers Need to Undergo Factory Testing

1、 Quality assurance and defect investigationIdentification of process and material defectsThrough routine tests such as DC resistance measurement and transformation ratio testing, problems such as winding breakage, inter turn short circuit, poor welding, and inconsistent wire specifications can be

Jul 02 2025

Test Theory of Insulation Resistance Tester

The testing principle of insulation resistance tester (also known as megohmmeter, shake meter) is based on Ohm's law (R=V/I), which calculates the resistance value of insulation material by applying DC high voltage and measuring leakage current, in order to evaluate its insulation performance. T

Jun 25 2025

The Necessity of Conducting Capacity Testing on Transformers

1、 Ensure the safety and reliable operation of equipmentPrevent overload riskAccurately measuring the actual capacity of a transformer can avoid its long-term overload operation. Overload can cause abnormal temperature rise in the winding, accelerate insulation aging, and even lead to fire or explo

Jun 18 2025

Composition of Cable Fault Testing System

1、 Core host componentsIntelligent cable fault testerFunction: Fault pre positioning is performed through low-voltage pulse method (measuring low resistance faults) and high-voltage flashover method (measuring high resistance faults), measuring the approximate distance of the fault point, the total

Jun 11 2025

Working Principle of Cable Fault Testing System

1、 Distance measurement principle (rough measurement of fault distance)Pulse reflection methodPrinciple: Inject low or high voltage pulse signals into the cable, and when the pulse encounters a fault point (impedance jump point, such as short circuit, open circuit, or high resistance fault), a refl

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