10 A LEAKAGE REACTANCE TESTER

• Measures the short circuit impedance of transformers
• Useful in detecting and diagnosing winding deformation
• Capable of performing measurements in single- or three-phase transformers
• Optional capacitor bank testing

The MLR10 10 A leakage reactance tester is used to measure leakage reactance and other associated parameters in high voltage power transformers. Leakage reactance, or more generally leakage impedance, is measured at the transformer primary winding while the secondary winding is shorted. Ideally, a transformer’s primary and secondary windings should be 100 % coupled by magnetic flux, but in real transformers there is always a small amount of leakage flux. Leakage inductance is a result of this leakage flux.

With the use of the MLR10’s optional capacitance test probe, electrical measurements can be isolated to individual legs of a complex capacitive bank network. The MLR10 ac voltage source is applied across the appropriate capacitor section (containing the capacitance of interest) and the optional capacitance test probe is used to isolate the measurements specific to the capacitor of interest. The MLR10 is offered as a standalone unit that requires the use of an external PC running Megger’s free MLR10 software.