Electrical thermography, insulation resistance (megohmmeter), motor protection, motor capacitors and battery internal resistance.
Set the overload relay from full-load current and service factor (0.58 × FLA on wye-delta), check the trip class against starting and stall times, and size the NEC 430.52 fuse or breaker, contactor and conductors.
Overload, trip class, fuseSize a capacitor at the motor terminals: kvar for the target power factor, 90% of no-load reactive power self-excitation limit, typical table by size and poles, reduced current and the new overload setting.
kvar, self-excitation, relayPaste internal resistance, impedance or conductance readings by cell and get each deviation from commissioning baseline or string average, cells on watch or to replace, and the trend across readings.
mΩ, impedance, conductanceClassify hot spots in panels, connections, breakers and cables by temperature difference (NETA criteria), correct for inspection load and estimate the temperature at full load.
ΔT, NETA, priority, loadCorrect the megohmmeter reading to 40 °C, compute the polarization index and absorption ratio, compare with the IEEE 43-2013 minimums, check the test voltage and track the inspection trend of motors and generators.
Megger, PI, IEEE 43 minimumImportant notice: Indus Metrics tools produce estimates and pre-sizing results from the data you enter and from published engineering methods. They do not replace design, calculations or reports signed by a licensed professional engineer (PE), nor verification against the applicable codes, standards and regulations, such as OSHA rules and the ASME codes. Material and fuel properties vary: check manufacturer data or your own process analyses before deciding. By using this site you agree to the Terms of Use.
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