ELECTROMECHANICAL STAND SEM-2

The stand is intended for carrying out tests in extent of acceptance tests according to Russian State standard GOST R 52776-2007 «Machines electrical rotating. Rated parameters and characteristics» for electric motors of power up to 18 kW in dust-ignition-proof construction. Testing is carried out in automatic mode. The stand can be used for incoming testing of electric motor.

The stand provides the following operating modes:

• no-load operation of tested motor;
• operation of tested electric motor with given torque;
• testing the insulation resistance;
• measuring the currents of tested electric motor in the whole loading range;
• control the operation modes of SEM-2 from personal computer.

Technical parameters and characteristics of the stand

• Rated supply voltage of SEM-2: 342…418 V, 50 Hz, 3-phase.
• Environment: operation at temperature +15 С to +30 С, in heated rooms.
• Storage – -40 С to +50 С. Continuous work at relative humidity 5…95%.
• Stand SEM-2 stabilizes three-phase sin-wave supply with frequency of 50 Hz and effective line voltage value of 380 accurate to 2%.
• The stand allows to carry out tests of electric motors of power 0,37 to 18 kW (more power – according to customer’ order) at speeds 1500 - 3000 revolutions per minute.

The stand provides monitoring of the following values:

1. power on the motor’s shaft;
2. rated (nominal) torque with accuracy no more than 10%;
3. rated speed with accuracy no more than 10%;
4. rated current;
5. no-load current;
6. harmonic composition of motor curents;
7. efficiency factor;
8. cos ф;
9. starting torque-to-nominal torque ratio;
10. starting (current-to-rated) current ratio;
11. winding insulation resistance

Test modes carried out at stand SEM-2 are:

1. measuring the insulation resistance in cold state;
2. test of electrical strength of insulation;
3. temperature-rise test;
4. checking no-load current;
5. determining power consumption and rated power;
6. determining rated speed;
7. determining efficiency factor and power factor;
8. testing for short-term rise of speed;
9. testing for short-term over-loading;
10. determining the rotor rotation direction;
11. checking the locked rotor mode;
12. determining ratios of initial starting torque and current of electric motor to the nominal ones;
13. determining ratio of maximum rotating torque of electric motor to the nominal one;
14. testing of the thermo resistor resistance