Methods of Starting of Synchronous Motors

Since synchronous motors are not self-starting inherently, we should have some means of starting synchronous motors. The methods are given below: 1. Induction Motor Start Damper windings, consisting of copper bronze bars embedded in slots in the pole faces and short-circuited at both ends are usually provided in synchronous motors which serve not only to … Read more

Single Cage & Double Cage Induction Motors

In this article, we will see the difference between Single Cage & Double Cage Induction Motors. Single Cage Double Cage 1. Starting performance As compare to double cage rotor, the single cage has less starting torque so at starting less heating loss occur. A double cage motor develops higher starting torque for low starting current and … Read more

Types of Losses in Transformer

Classification of Transformer losses A transformer is a static device, hence mechanical losses (like windage or friction losses) are absent in it. There are mainly two types of losses in the transformer. They are 1. Core losses or Iron losses Hysteresis loss Eddy current loss 2. Copper losses Apart from these two types, there are … Read more

Squirrel Cage & Slip Ring Induction Motor | Advantages

In this article, we will learn about Squirrel cage and slip ring induction motors. These motors are having the difference in rotor construction. Squirrel cage Induction Motor In Squirrel cage induction motors the rotor is simplest and most rugged in construction. Cylindrical laminated core rotor with heavy bars of copper or Aluminum is used for conductors. … Read more

Core Balance Current Transformer – Working, Advantages & Applications

Introduction Core Balance Current Transformer or CBCT is a ring-type current transformer through the center of which a three core cable or three single core cables (forms the primary winding) of three phase system passes. This type of current transformer is normally used for earth fault protection for low and medium voltage system. A typical … Read more

Advantages of Instrument Transformers

Voltmeters and Ammeters are used to measure the voltage and current in the circuits. Using instrument transformers, ranges of these devices to measure can be increased. A current transformer is basically a step-down transformer; hence it steps down the current. When used in conjunction with the low range ammeter, a current transformer (CT) increases the range … Read more

Causes of Inrush Currents in Transformers

When a transformer is energized after a short interruption, the transformer may draw high inrush currents from the system due to core magnetization being out of synch with the voltage. The inrush currents will be as high as short-circuit currents in the transformer (almost 20 to 40 times the rated normal full load current of … Read more

error: Content is protected !!