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Among the three-phase asynchronous motor running faults, the faults caused by the electrical connection account for a large proportion, and it is often easy to find the fault point. To determine whether the electrical connection points are in good contact, the editor of Dalan Motor teaches you to use the following traditional methods:
(1) Intuitive inspection: that is, check the connection points for discoloration, arc burn marks, breaks, etc.
(2) Hammer check: tap the connection point with a small hammer and listen for abnormal sound
(3) Checking the feeler gauge: measure the tightness of the two joint surfaces, if there is a gap, the contact is poor.
(4) Electrical inspection: measure the DC resistance of the motor with a double-arm bridge and compare the records over the years (note that it must be converted to the same temperature). The difference between them is bad contact.
(5) Tightening bolts: Re-tighten all electrical connection points, if loose, it is poor contact.
The above are the shortcomings and deficiencies of several methods, that is, they can not accurately and intuitively reflect the poor contact of the electrical connection points. In the fourth type, the measurement accuracy is affected by the contact between the measurement line and the test point, the oxidation contact of the bridge arm contact surface, etc., plus the double arm bridge is powered by the battery, the current is very small, so the measurement accuracy is affected.
In addition, there are two better methods of fault diagnosis:
(1) The loop resistance tester measures the contact resistance of the electrical connection point
The loop resistance tester uses 220V AC power, which is composed of two parts: measuring digital voltmeter and adjustable constant current source. It can target a specific contact point, pass a large current of 100A, and directly read the contact resistance value from the digital meter. It can clearly and intuitively reflect whether the motor connection is in good contact.
(2) Test the temperature of the electrical connection point with an infrared thermometer
Temperature is a very important factor in equipment fault diagnosis. Poor electrical connection often causes connection points to heat up. The temperature of the connection point can be used to determine the failure of the connection point. Using an infrared thermometer can quickly provide temperature measurement. It is safe, accurate and does not need to be shut down. .
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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