The electrical parameters of the electric ventilation fan

The electrical parameters of the electric ventilation fan includes many highlights insulation properties, electrical strength, leakage current, stable temperature rise, the start-up performance, total input power.

Insulation performance: electric ventilation fan at high temperature [(40 soil 2) ℃] state of high humidity (93%), winding insulation resistance of the chassis should ≥ 2MΩ reinforced insulation of the live parts of the insulation resistance ≥ 2MΩ . Megger can be used to measure the insulation resistance. In the case of electric ventilation fan power outage, respectively, leads by two terminals on the megger "circuit" and "ground" two lines to the subject site, then shake the handle of about 120 beats / min speed smoothly 1min, until the pointer is stable, you can read out the value of insulation resistance megger indicated.

Electrical strength: when the electric ventilation fan long-term work, not only to withstand the rated working voltage, may withstand overvoltage. When the voltage reaches a certain value, it will cause insulation breakdown. Electric strength test is also known as a pressure test. Safe and reliable in order to ensure the use of electric ventilation fan, the insulation between the live parts and the enclosure shall withstand 50Hz sinusoidal AC voltage lasted 1min without breakdown.

Leakage current: a certain voltage conditions, by the electrical conductive part through the insulation to the leakage current between the ground and non-charged shell known as leakage current. Electric ventilation fan and stable temperature rise at 1.1 times rated voltage, leakage current between the shell and the power ≤ 0.25mA.

Stable temperature: by measuring the motor windings, the temperature rise or the temperature of the reactor winding, the purpose is to determine whether the electric ventilation fan can work reliably.

Start performance: the conditions of the nominal frequency, electric ventilation fan in a stop operation state of the lowest speed, Table fan of the motor shaft is horizontal, and the TOGGLE within any point, plus 85% of the rated voltage, should be able to smooth start from stationary state .

Input Power: Enter the total power electric ventilation fan drive motor and its electrical parts can be disassembled, the sum of the input power at the rated voltage and normal operating temperature. Measured the total input power, electric ventilation fan in the nominal conditions, normal temperature; detachable electrical devices are in working condition; desk fan class electric ventilation fan motor shaft is horizontal, and shook his head status, the highest speed test run after 30min.