Recommendations for use of the device registration and analysis of electricity Nexus 1500 for the diagnosis and drives - energo-news.ru

Анализатор electricity Nexus 1500 [1] is not only a commercial electricity metering device (“counter”), but also energy quality analyzer and high-registrar (“oscilloscope»).

Registration forms voltage and current waveforms can be performed up to 10 MHz (200 000 measurements for the period). Registration can be performed in a continuous mode, and trigger events, such as registration of transients when starting equipment.

This registration provides a significant amount of important diagnostic information.

give a few examples, showing the diagnostic value of shape analysis of currents and voltages Electrical:

• Spectral analysis of current oscillations can detect problems with the three-phase asynchronous motors windings [2].
• Availability transient partial discharges that displayed in the form of rare peaks in the current oscillogram indicates the beginning of the degradation of the insulation of high voltage motors and generators [3].
• condition isolate power generating sets is reflected in the frequency characteristics of the current [4].
• Note that the shape of the voltage curve can be judged not only on the electrical equipment itself, but also on the state of the mechanical drives. For example, non-sinusoidal voltage to the motor can be judged on the problems with the mechanical part of the electric pump [5].
• particular diagnostic value is a combination of information about the form of voltages and currents with information on other, non-electrical parameters, such as speed actuators, load units (eg, mills or pipelines), temperature and bearing assemblies, pressure and flow in pipelines.

Since the instrument Nexus 1500 records the waveform with the mark and time specified database real-time stories also write their data with time stamp, then comparing the events marked with these databases, with the current and voltage waveforms and applying modern methods of statistics and time series analysis such as fast Fourier transforms, wavelets, and regresionny factor analysis, it is possible to diagnose equipment failures and prevent losses associated with these failures.

Links:

1. Nexus 1500 – Power Quality Analyzer .

2. NP Sparrows, SN Vorobyov, GV Suhankina, NT Herzen, Methods and tools for diagnosing the insulation of induction motors.

3. Energy saving and automation electrical compressor stations. Ed. O.V.Kryukova. “Giprogaztsentr”, Nizhny Novgorod, 2010.

4. Zavarihin DA Development of frequency method to ensure safe operation of electric and gas industries of machine units. Abstract of the thesis for the degree of Ph.D. Ufa, 2009

5. Bashir M. Diagnosis and other pumping equipment in the parameters of the electromagnetic actuator circuit.

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