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A Comprehensive Guide to Doble Testing

What is Doble Test?

Doble M4000 M4100 Power Factor Insulation AnalyzerDoble test is slang for a power factor/dissipation test that is performed on MV cables, motors and transformers. The equipment to be tested is supplied with an AC voltage below the normal rating. Simultaneously, the dielectric losses occurring to the ground are also measured and recorded. After proper corrections of the field measurements to compare to standard conditions, the test results are compiled and compared to standard guides.

Why perform a Doble test?
Whenever electrical systems malfunction, the reason can be tracked down to breakdown of the insulation system. Power factor test or Doble test is the best method to detect any defects in the insulation of the electrical systems and take proactive action to prevent loss. It reduces the strain of making an internal visual inspection, thereby reducing the cost of maintenance and resulting in increased productivity and efficiency.

Why Doble?
When it comes to power factor tests, Doble testing services are the best. Doble equips its clients with extensive databases and other additional aids so as to greatly simplify the process. At Protec, we stock most Doble electrical test equipment required for power factor tests. You can either try them out with our electrical test equipment rental services or buy them from us.

Doble M4000 M4100 Power Factor Insulation Analyzer

The Doble M4000 M4100 Power Factor Insulation Analyzer is able to perform the following tests: 

• Power factor analysis to make sure that insulation integrity and quality is maintained 

• Turns ratio testing for detection of winding damage or shorted turns 

• Capacitance test to measure any physical change that might harm the apparatus 

• Leakage reactance/short circuit impedance testing to evaluate winding deformation (with the optional Doble M4110)

• Excitation current tests to make sure that transformer’s magnetizing current is optimal 

• Short circuit impedance testing to find any possible problems in winding

• Capacitor bank testing to detect deteriorating or failed capacitors within a bank (with optional Doble M4140)

• Easy and accurate testing with Doble Test Assistant (DTA) software 

• Source output voltages from 25V to 12kV (10kV continuous)

This electrical test equipment is available for rent, lease, or purchase from Protec Equipment Resources. We are here to help you with your testing equipment needs.

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