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Learn about power transformers — construction, working, testing, protection, and maintenance for efficient voltage transformation in power systems.
Nowadays, ester oils have become an alternative to conventional mineral transformer oil. These ester oils provide insulation and cooling to the transformer. We may use them, particularly where fire safety is crucial. Also, we may use ester oil where we essentially require environmental sustainability and improved insulation life. In this article, we have covered natural … Read more
The answer is no. A three-phase star- star or Yy0 transformer does not always demand tertiary delta winding. Let us explain the basic theory behind it. The video Lecture on this Topic Tertiary Delta Winding Suppose, an asymmetrical fault occurs in the LV network of a transformer. Obviously, zero sequence currents start to flow though … Read more
In this article, we are going to discuss the Oil Temperature Indicator. In a power transformer, especially in a large power transformer, we generally see three temperature indicators installed. One is for the high-voltage winding temperature, another is for the low-voltage winding temperature, and the third one is the Oil Temperature Indicator. In this article, … Read more
In this article, we will discuss the Winding Temperature Indicator of a power transformer. First, let us understand what a Winding Temperature Indicator actually is. Inside the marshalling box of a power transformer in a substation, we generally see two temperature indicators, and sometimes even three temperature indicators. Among these, one is the HV Winding … Read more
What is the main purpose of a power transformer? A power transformer is mainly used to transfer power from one voltage level to another voltage level for transmission or sub-transmission purposes. Power transformers are of two types: step-up transformers and step-down transformers. A step-up transformer increases the voltage level of the generated power from the … Read more
Inrush current in a transformer is caused by the saturation of the core when a high flux is produced at the instant of switching on the transformer. We will explain this phenomenon in the following discussion. Also we shall discuss the necessary theory so that the concept becomes clear. Steady State Flus in a Transformer … Read more
Whenever a dead short-circuit fault occurs in the transformer circuit, the transformer delivers a very large current. Under this condition, the apparent power delivered by the transformer becomes very high. The maximum MVA that the transformer can deliver during this fault condition is the fault MVA of the transformer. Calculation of Fault Current of a … Read more
Practice important power transformer MCQs with detailed explanations. Improve your understanding of transformer principles, testing, losses, and protection. Video on Transformer EMF Equation
What is a Transformer? A power transformer is a static electrical device. It transforms power from one circuit to another circuit without any direct electrical connection. The working principle of a transformer is based on mutual induction. Ideally, it transforms the entire power without changing its frequency. There are mainly three types of transformers: step-up … Read more
Here, we will discuss the ideal transformer. First, let us understand what an ideal transformer is. An ideal transformer is a transformer that has no losses. The word “ideal” means the transformer operates with 100% efficiency. A transformer becomes 100% efficient only when there is no power loss. Why does power loss occur in a … Read more