Overview of tests

Tests asynchronous motors

Test voltage withstand
  • To kV/50 18 Hz, 50 kVA, according to EN 60 034-1 and EN 60 034-18
  • The test is usually carried out in a non impregnated state
Winding Stator coils to earth and between phases
Additional elements
  • Heating elements
  • Temperature sensors
Detection of discharge activity and undeveloped shorts For the stator coils and auxiliary elements
Resistance Measurements
Winding With temperature compensation and conversion to the standard temperature
Additional elements
  • Heating elements
  • Temperature sensors
Capacitance measurement
Winding Winding capacity to ground after impregnation (f = 1 kHz)
Test of the magnetic field
The distribution of magnetic poles Energizing the stator and the detection by the measuring coil
Direction of rotation As part of the measurement of the distribution of magnetic poles
Test insulation shockwave
  • Checking of the insulation of all winding coils
  • Highly sensitive detection of partial breakdowns down to individual shorted turns

Functional testing of asynchronous motors

No-load Standard acceleration, measuring sections of the no-load characteristic, the symmetry of the phase currents and internal wiring
Short Measurement of short-circuit voltage without blocking the shaft, the symmetry of the phase currents and internal wiring
Load characteristics when using the load machine
  • Static
  • Automated measurement steps
Torque characteristics when using the load machine
  • Static
  • Automated measurement steps
  • Variable speed ramps
  • Possibility of measuring the oscilloscope waveform of the torque
Heat run
  • The long-term record of heating up of the machine at constant power
  • Possibility of energy regeneration
  • Measuring the temperature rise of motors fed from a frequency converter
Cooling characteristics Determination of the winding temperature at the time of shutdown from the cooling curve according to EN 60 034-2
Efficiency Determining efficiency class from 1-4 according to IEC 60 034-2, IEEE 112, CSA 390
Vibration Measurement
  • Evaluation of the RMS values ​​of the acceleration, velocity and displacement according to EN 60 034-14.
  • Evaluation of the FFT spectra, detection of resonance during acceleration and deceleration using the "waterfall" chart.
Measurement of noise Evaluation of noise according to DIN EN 60 034-9
Voltage withstand tests To kV/50 18 Hz, 50 kVA, according to EN 60 034-1 and EN 60 034-18
Insulation Test Measurement of winding insulation resistance
Starting current Measurement and evaluation of the spectrum starting currents at reduced voltage for detecting faults in a cage rotor
Blocked rotor torque test
  • Measurement of static torque for a short time when the shaft is blocked
  • Measurement of static characteristics in the 5-second test
Measurement of winding resistance With temperature compensation and conversion to the standard temperature
Measurement of motors fed from frequency converters
  • Deviations of warming in different shaped voltage curves
  • Measurement of electrical quantities in the frequency range up to hundreds of kHz using the power analyzer

 

Functional testing of synchronous generators

The test-load and increased voltage Measurement of the excitation characteristics and determination of mechanical losses and no-load losses
Short
  • Single point measurement of characteristics briefly during deceleration
  • Alternatively, the entire measurement characteristics of the synchronous generator driven by a dynamometer or asynchronous motor
Load characteristics in motor mode Measuring multiple load points of the synchronous generator in the range of 0 to 150 % of rated current in the  mode of the synchronous compensator
Load characteristics in generator mode Measuring multiple load points of the synchronous generator in the range of 0 to 150 % of rated current driven by a dynamometer or asynchronous motor
Heat run The long-term record of the heating up of the machine at a constant current
Cooling characteristics Determination of the winding temperature at the time of shutdown during cooling according to EN 60 034-2
Increased speed test The test in the de-energized mode up to 2.5 x the rated speed, vibration measurement equipment
Vibration Measurement
  • Evaluation of the RMS values ​​of acceleration, velocity and displacement according to EN 60 034-14.
  • Evaluation of the FFT spectra, detection of resonance during acceleration and deceleration using the "waterfall" chart.
Measurement of winding resistance With temperature compensation and conversion to the standard temperature
Evaluation of losses and efficiency According to IEC 60 034-2