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Causes of Motor Suffers from Heavy Vibrations and Excessive Noise when Operating

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Causes of Motor Suffers from Heavy Vibrations and Excessive Noise when Operating  Q. What are the probable causes, if the motor suffers from heavy vibrations and excessive noise when operating ? The induction motor’s performance is affected by the harmonics in the time variations of the impressed voltage.  Air-gap flux harmonics are produced due to … Read more

Advantages of Phase Balancing

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Advantages of Phase Balancing  Following are the main advantages of phase balancing : Due to phase balancing the load is uniformly and almost equally distributed on all the three phases of the system. Due to imbalance, feeder capacity is not property utilized hence balancing makes proper utilization of feeder capacity.  Current balancing procedure will remove … Read more

Need of Energy Conservation in Transformer

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Need of Energy Conservation in Transformer Q. State the need of energy conservation in transformer. Transformer is a vital power equipment in a power system, which plays significant role in generation transmission and distribution of electrical energy. Transformer operating efficiency directly affects the costs and benefits of the whole power system.  In a typical power … Read more

External Causes of Failure and Abnormal Operation of Equipments

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External Causes of Failure and Abnormal Operation of Equipments Q. What are the external causes of failure and abnormal operation of equipments.  External Causes : A 3 – phase machine is supplied with 3-line wires L1 L2 L3. These are called as lines. If the fault is developed in the feeder / Distributor line only two lines will … Read more

Reasons for Developing Electrical and Magnetic Fault

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Reasons for Developing Electrical and Magnetic Fault Q. Give the reasons for developing electrical and magnetic fault. Electrical Faults :  Sr. No. Fault Reasons Remedial measures 1 Wrong electric connections Field winding connections may be wrong. Field-Armature winding connections might be wrong. 3-phase motor phase sequence connection R-Y-B may be wrong. Check the connection. Check … Read more

Transformer Energy Conservation Method

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Transformer Energy Conservation Method After selection of a transformer, adopt a transformer economic operation scheme to arrange operations, make the transformer operate in economic operation interval, economic switching of transformer between each operation mode and economic dispatch between transformer loads, etc.  Adopting these schemes can improve transformer operating efficiency and reduce its operation on achieve … Read more

Classification of Insulating Material as per IS

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Classification of Insulating Material as per IS Q. State the Classification of insulating material as per IS. No. Class Insulating Materials Uses 1 Y/ O Cotton, silk, paper vulcanized fibers wood PVC, VIR etc. Always used with impregnation. 2 A Cotton, silk, paper press, vulcanized fibers wood etc. Impregnated dielectric oil or varnish also some … Read more

Procedure for Cleaning, Washing and Drying of Insulation & Describe the Vacumm Impregnation Method of Varnishing

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Procedure for Cleaning, Washing and Drying of Insulation & Describe the Vacuum Impregnation Method of Varnishing  Q. Explain the procedure for cleaning, washing and drying of insulation and describe the vacun impregnation method of varnishing. Methods of cleaning insulation : The failure of insulation takes place due to absorption of moisture. Oil, dust, dirt, excessive … Read more