What are the reasons for the three-phase motor to cause single-phase operation? Dalan hydraulic motor manufacturers come to analyze and share preventive measures with you.
What are the reasons for the three-phase motor to cause single-phase operation? Dalan hydraulic motor manufacturers come to analyze and share preventive measures with you.
There are three main reasons for the three-phase motor to cause single-phase operation:
1, the fuse is blown
1 Fault blown: Mainly due to the single-phase grounding or phase-to-phase short circuit of the main circuit of the motor, the fuse is blown.
Precautionary measures: Select the electric motor and the correctly installed low-voltage electrical appliances and circuits that are suitable for the surrounding environmental conditions, and check them regularly to strengthen the daily maintenance work and eliminate all hidden dangers in time.
2 Non-faulty fuse: mainly due to improper selection of melt capacity and small capacity. When the motor is started, the fuse is blown by the impact of the starting current.
The non-faulty fuse of the fuse can be avoided. Do not think that the capacity of the melt should be chosen as small as possible to avoid the starting current of the motor, so as to protect the motor. We must make it clear that the fuse can only protect the motor from single-phase grounding and phase-to-phase short-circuit accidents, and it must not be used as an overload protection for the motor.
2, the main loop is prone to failure
1 The contactor's dynamic and static contacts are in poor contact.
The main reason is that the contactor is not properly selected, the arc-extinguishing ability of the contact is small, and the static and dynamic contacts are stuck together, and the three-phase contacts are not synchronized, resulting in phase loss operation.
Precautions: Choose a suitable contactor.
2 The use environment is as bad as humidity, vibration, corrosive gas and poor heat dissipation conditions, resulting in contact damage or wiring oxidation, poor contact and phase loss.
Precautionary measures: Select electrical components that meet environmental requirements, and take appropriate protective measures to force the improvement of the surrounding environment and replace components regularly.
3 Irregular inspection, the contactor contacts are severely worn, the surface is uneven, and the contact pressure is insufficient to cause phase loss operation.
Precautionary measures: According to the actual situation, determine the reasonable inspection and maintenance cycle, and carry out strict and careful maintenance work.
4 The thermal relay is improperly selected, causing the bimetal of the thermal relay to be blown, resulting in phase loss operation.
Precautions: Choose a suitable thermal relay to avoid overloading.
5 Improper installation, causing wire breakage or wire damage due to external force and phase failure.
Precautionary measures: During the construction of wires and cables, it is necessary to strictly implement the “standards†and conscientious and civilized construction.
6 The quality of the electrical components is unqualified, and the capacity does not reach the nominal capacity, resulting in abnormal phenomena such as contact damage and sticking.
Precautions: Select suitable components and perform a careful inspection before installation.
7 The quality of the motor itself is not good, the coil windings are poorly welded or desoldered; the lead and the coil are in poor contact.
Precautions: Choose a motor with better quality.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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