Ac withstand voltage test: a test of the insulation in ac withstand voltage test is very strict, can effectively find the dangerous concentration of defects. It is the most direct identification of electrical equipment insulation intensity method, to determine whether electric equipment in operation has the decisive significance, insulation accidents and ensure equipment insulation level, an important means. Ac Brushless Gear Motor withstand voltage test can sometimes make insulation some weaknesses in the more developed, so before the test must be carried out on the first try, absorption ratio, insulation resistance of the project such as leakage current and dielectric loss test, test result is qualified to ac withstand voltage test.
1) The stator winding: when commissioning test, the rated voltage of 0.4 kv and below 1 kv, rated voltage of 6 kv take 10 kv; To run the motor, as well as to the overhaul of the replacement or partial replacement of stator winding motor take 1.5 times rated voltage, but shall not be lower than 1000 v; All of the change of the stator winding motor take 2 times rated voltage and 1000 v, but shall not be lower than 1500 v; Less important under 100 kilowatts of low voltage motor, the ac withstand voltage test can be used to test 2500 v megohmmeter;
2) Rotor winding: when commissioning test, 12v Dc Motor High Torque Low Rpm the irreversible son take 1.5 times rated voltage, the reversible rotor take 3 times rated voltage.
Note: synchronous motor rotor winding ac withstand 24v Dc Motor With Gearbox voltage test, the test voltage is 7.5 times that of the excitation voltage, but should not be lower than 1200 v, no more than 75% of the factory test voltage.
E) The turn-to-turn insulation test: to increase the supply voltage to 130% of the rated voltage, the motor idling 5 min, should be no short-circuit phenomenon, says the turn-to-turn insulation test, the purpose is to examination between turn and turn insulation.
F) Rotor open circuit voltage measurement: measure the rotor Parallel Shaft Gearbox when the open circuit voltage, rotor stationary, the rotor winding is open circuit, starting rheostat disconnect, places rated voltage on the stator winding, wire in turn subsets between ring measurement between voltage, rated voltage above 500 v motor, applied on the stator winding voltage can be appropriately reduced.
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