Zuzuru July 22, 4. The test must be performed in Manual mode, and any test circuit will do. The Extension M Switch must remain open until all personnel are safely in the clear. F Storage and Moving Mode July 22, When using this interface, the standard M safety switch and safety strobe are used. The Resonator is equipped with a core-clamping arrangement to reduce the noise level when the Resonator is in use, and more importantly, to minimize vibration.

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Photo: Doble Most failures of electrical power equipment are the result of a breakdown in the insulation system. To keep failures at a minimum, periodic maintenance testing of the insulation is recommended to indicate whether it is deteriorating, and how fast. Power factor tests are used to measure dielectric losses, which relate to the wetness, dryness or deterioration of electrical insulation.

Power factor is defined as the cosine of the phase angle between voltage and current. Measuring insulation power factor is achieved by calculating the ratio of the capacitive or "charging" current measured in voltamperes to resistive or "leakage" current measured in watts. Photo: Doble Engineering. Testing power factor is a means of measuring the integrity of the insulation, since the smaller the power factor, the better the insulator. This is one of the best testing techniques for predictive and preventive maintenance.

Power factor testing also makes it possible to detect equipment insulation problems without making an internal visual inspection. The result is a significant decrease in maintenance cost and downtime. Power factor test sets have four different leads for connecting to the device under test: Power factor test sets have four different leads for connecting to the device under test. Not specific to any mode of operation. Power Factor testing is typically performed at 10 kV or values equivalent to 10 kV are obtained.

Examples of this would be the leakage between the high side winding and low side winding of a transformer or the current leaking between the line side and the load side of an open circuit breaker.

There are two paths of leakage current returning to the test set, ground or guard. When considering the three different modes of the power factor test set, it is important to understand which test leads are associated with each mode.

Photo: Doble. The GST Guard tests measures the total current leaking to ground only. The power factor test set ignores current flowing through the red or blue lead. Inversely, in UST mode, ground is considered guard since grounded terminals are not measured. When the UST test is performed, the only current being measured by the test set is the current flowing on the red or blue lead.

Any current flowing to a grounded terminal is bypassed directly to the AC source return and is eliminated from the measurement. UST mode is used to measure insulation between two ungrounded terminals of the apparatus, isolate an individual section of insulation and test it without measuring other connected insulation. In the last mode of operation, the GST mode, both leakage paths ground lead and the red or blue lead are measured by the test set. This gives the overall condition or power factor of the test specimen.

If the sum of the UST and GST guarded parameters do not equal the GST parameters, then either the test set is malfunctioning or the test leads are configured incorrectly.


Doble M4100 Manual

Mizahn While most test instruments use available power lines or portable generators to generate the output test signal, the M uses an internal waveform generator to create its own precise sine wave. Cleaning, dielectric testing, drying, visual inspections, stamping, packing, and documentation is all M software makes testing easy, fast, and smart. Get a quick quote: Built-in test set diagnostics provide information on instrument status. This produces reliable results and stable readings. Advanced digital technology takes accuracy to new levels.



This produces reliable results and stable readings. Unlike other test instruments, the M eliminates the need to balance the bridge, automatically making measurements for you. Even a small change in a measurement becomes a reliable diagnostic indicator. With a maximum output of mA at 10 kV, the M offers high charging current, allowing you to run single-phase exciting current tests at higher voltages, increasing the turn-to-turn stress. Cleaning, dielectric testing, drying, visual inspections, stamping, packing, and documentation is all Dielectric testing for our electrical testing laboratory. The M allows you to perform a variety of diagnostic tests: Rugged construction provides the accuracy of a laboratory instrument with the ability to withstand harsh field conditions. Provides the highest power to better dble in-service conditions.


Doble M4100


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