The Sonel MIC-15K1 Insulation Resistance Meter is designed to measure the insulation resistance of power objects such as single- and multicore cables, transformers, motors and generators, capacitors, switches and other devices installed in power stations. It is especially recommended for measurements in areas with very high electromagnetic disturbances, e.g. electrical substations with 1200 kV AC and 500 kV DC. Thanks to the 15 kV measuring voltage (in accordance with ANSI / NETA ATS-2009 TABLES 100.1) the meter can be used for measuring objects with a nominal voltage above 34.5 kV.
Capabilities of the device
Highly efficient HV inverter, with a test voltage of 15 kV and current up to 10 mA, suitable for measuring the insulation resistance up to 40 TΩ. Achieving such a result makes these meters unrivaled devices. Three-wire resistance measurement, performed using a "GUARD" wire, eliminates surface leakage currents caused by contaminated insulation, thereby increasing the reliability of obtained results.
The meter indicates the Dielectric Absorption Ratio DAR, Polarization Index PI and the value of Dielectric Discharge DD. The device allows the user to assess the condition of the insulation by applying the test voltage incrementally in steps (SV - Step Voltage) or smoothly (RampTest - RT).
- SV method ensures that a dielectric in good condition will provide the same results, regardless of the applied voltage.
- RT method allows determining the characteristics of the insulating material. The meter smoothly increases the measuring voltage without exposing the object to so-called electrical stress. It records the time and voltage value at which the electrical breakdown of the insulation took place.
Built-in digital filters, with an averaging time of 10, 30, 60, 100, 200 sec. guarantee stable measurement results in areas of strong electromagnetic interference.
Burnout
A very useful solution is the function that allows to Burnout the damaged object. In the case of exposed cables, it enables visual identification of the fault location. In the case of shielded cables, the method allows generating a seismic acoustic wave from the place of damage.
In special conditions, an energetic discharge will appear cyclically. By using the geophone, it will be possible to precisely pinpoint the place where such a discharge occurs.
Burnout feature also allows locating transient faults (appearing, for example, only during rainfall) with the support of reflectometry, and in case of a short circuit (of a screen or return wire) to the ground - applying the method of measuring voltage drop (the A-frame).
Autosaving the measurement results
The device automatically saves the measurement results. The number of autosave points depends on the amount of data that is saved within the main memory.
Data analysis
The Sonel MIC Mobile mobile app allows observing the results during the measurement. The application can generate real-time graphs in various configurations. This allows evaluating the condition of the object already during the tests.
The option of remote start and stop of the measurement is particularly useful. Thanks to it, the tests can be carried out remotely, eg. from a different room or inside the car, when there are difficult weather conditions for the user. Using the phone's GPS, it is possible to precisely determine the place of measurement.
Thanks to the mobile application and the Sonel Reader software, the user can store previous measurement data and compare them with current results transferred from the meter's extensive memory. This solution allows you to prepare a measurement report, track the progress of insulation degradation and plan renovation works.