Electrical4U 
SCRs are available with ratings up to 10 KV and 3 KA. However, sometimes higher ratings are needed. In such cases, multiple SCRs are used together. Series connections meet high voltage demands, while parallel connections meet high current demands. For efficient operation, all SCR should be fully utilized, but due to different V-I characteristics, unequal … Read more
Protection of a device is an important aspect for its reliable and efficient operation. Silicon Controlled Rectifier (SCR) are a very delicate semiconductor device. So we have to use it in its specified ratings to get desired output. SCR may face different types of threats during its operation due to over voltages, over currents etc. … Read more
The describing function is an approximate procedure for analyzing certain nonlinear control problems in control engineering. To start, let us first recall the basic definition of a linear control system. Linear control systems are those where the principle of superposition (if the two inputs are applied simultaneously, then the output will be the sum of … Read more
Earth Leakage Circuit Breaker or ELCB An Earth-leakage circuit breaker (ELCB) is a safety device used in electrical installations (both residential and commercial) with high Earth impedance to prevent electric shocks. It detects small stray voltages on the metal enclosures of electrical equipment, and interrupts the circuit if a dangerous voltage is detected. ELCBs help … Read more
The power system has three main parts: generation, transmission, and distribution. This article focuses on power generation, where one form of energy is converted into electrical energy. Electrical energy is produced from various natural sources. Energy sources are classified into renewable and non-renewable types. Currently, most electrical energy is generated from non-renewable sources like coal, … Read more
Before I introduce you about various compensation in control system in detail, it is very essential to know the uses of compensating networks in the control system. The important uses of the compensating networks are written below. Necessary of Compensation Methods of Compensation Series Compensator Feedback Compensator Load CompensatorNow what are compensating networks? A compensating … Read more
Introduced in 1948 by Evans, the root locus technique helps represent any physical system using a transfer function. This function is crucial for analyzing system stability and performance.We can find poles and zeros from G(s). The location of poles and zeros are crucial keeping view stability, relative stability, transient response and error analysis. When the … Read more
In this article, we will discuss discrete signals, made up of digital data in control systems. But first, why do we need digital technology when we have analog systems?So let us discuss first some advantages of digital system over analog system. How do you convert a continuous signal into discrete signals? The answer is simple: … Read more
In network synthesis theory, if any pole of the system is on the right side of the s-plane origin, the system becomes unstable. Based on this, A. Hurwitz and E.J. Routh investigated the conditions for system stability. They developed two stability criteria. The first is the Hurwitz Criterion, also known as the Routh Hurwitz (R-H) … Read more
In this article, we will discuss various methods of starting a three phase induction motor. Before that, it’s essential to understand the torque slip characteristic of these motors.The torque slip characteristic shows that at slip equals one, there is positive starting torque. This makes the three-phase induction motor self-starting. So, why do we need starters? … Read more