Three-phase asynchronous motorThere is a difference between the star connection and the triangle connection. When we measure the motor insulation, we must first distinguish what connection is usedMori machineXiaobian together to understand it!

       The star connection method is simply to connect the three phases together, and the joint is connected to the three phases of the power supply respectively; If the three points are connected in turn, the power supply is connected in a triangle connection.

      Knowing the difference between connections, let's look at measuring motor insulation to judge whether the motor is good or bad.

     1Star connection method: When measuring the insulation to the ground, as long as one end of the instrument is grounded and the other end is connected to any terminal post in the motor junction box, it can be measured; If it is to measure the insulation between phases, we must first open the short splice and measure the three phases separately;

     2Triangular connection method: To measure the insulation to the ground, one end of the instrument needs to be grounded, and any terminal in the other end of the motor junction box can measure the insulation to the ground; The measurement of insulation between phases is to first open the short splice and measure three phases separately. If it's low pressureThree-phase asynchronous motorSo the insulation is greater than0.5MΩIs qualified (1000VMeasuring instruments), high voltage motor insulation is greater than per thousand volts15MΩBe qualified (2500VMeasuring instrument)

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