Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

A stationary generator must never be connected to live busbars. When a generator is at standstill, the induced electromotive force (EMF) is zero, which would lead to a short - circuit if connected to live busbars. The process of synchronisation and the associated equipment for verification remain consistent, whether it involves connecting one alternator in parallel with another or linking an alternator to an infinite bus.Contents Synchronisation by Synchronising Lamps Advantages of the Dark Lamp

Rated System - Source Short - Circuit Breaking CurrentThe rated system - source short - circuit breaking current refers to the maximum system - source short - circuit current that occurs at the moment of contact separation. A generator circuit - breaker is required to be able to interrupt this current under the conditions specified in relevant standards. This particular current is observed in a circuit where the power - frequency recovery voltage aligns with the rated voltage of the generator ci

Hydrogen Cooling of Synchronous GeneratorsHydrogengas is utilized as a cooling medium within generator casings due to its exceptional cooling properties. However, it's crucial to note that certain mixtures of hydrogen and air are highly explosive. An explosive reaction can occur when the hydrogen - air mixture contains anywhere from 6% hydrogen and 94% air to 71% hydrogen and 29% air. Mixtures with more than 71% hydrogen are non - combustible. In practical applications, a 9:1 ratio of hydrogen t

Cooling of Synchronous Generators: Methods, Advantages, and LimitationsImportance of CoolingCooling is a critical aspect of synchronous generator operation. Natural cooling mechanisms are insufficient to dissipate the substantial amount of heat generated within alternators. To address this, forced air cooling systems are employed. In such systems, air is actively pushed into the alternator, ensuring a larger volume of air passes over its surfaces, effectively removing a significant amount of hea

Stepper Motor ApplicationsStepper motors are manufactured in a diverse array of sizes, with power ratings spanning from milliwatts to hundreds of watts. Their maximum torque can reach up to 15 Newton - meters, while the step angle typically ranges from 1.8 to 90 degrees. As previously explored in discussions about stepper motors and step angles, these motors have an extensive range of practical applications, some of which are detailed below.One of the key strengths of stepper motors lies in thei

DefinitionA brushless DC motor drive is defined as a self - controlled variable frequency drive that utilizes a sinusoidal Permanent Magnet Alternating Current (PMAC) motor. This type of drive offers several notable advantages. Practically maintenance - free, it boasts an extended lifespan, making it a reliable choice for various applications. Additionally, it features low rotational inertia, minimal friction, and operates with low - frequency characteristics. Moreover, it generates minimal radi

Regenerative BrakingIn regenerative braking, the kinetic energy of the driven machinery is harnessed and fed back into the power supply mains. This braking mechanism comes into play when the driven load or machinery compels the motor to operate at a speed exceeding its no - load speed while maintaining constant excitation.Contents Applications of Regenerative Braking Regenerative Braking in DC Shunt Motors Regenerative Braking in DC Series MotorsUnder the conditions of regenerative braking, a si

Commissioning Tests for Generator Circuit BreakersOnce a Generator circuit breaker has been installed, comprehensive commissioning tests must be conducted. The primary objectives of these tests are to: Ensure that no damage has occurred during transportation and storage. Verify the compatibility of individual components. Confirm that the assembly has been carried out correctly. Validate the proper performance of the fully assembled generator circuit breaker.Verification of Generator Circuit Brea

The Split Phase Motor, alternatively referred to as a Resistance Start Motor, features a single - cage rotor. Its stator is equipped with two distinct windings: the main winding and the starting winding. These two windings are spatially displaced by 90 degrees, a configuration that plays a crucial role in the motor's operation.The main winding is characterized by its very low resistance and high inductive reactance, while the starting winding exhibits the opposite characteristics, with high resi

Two Phase AC Servo MotorIn a previous article, we've already explored servo motors. In this one, we'll focus on two - phase and three - phase AC servo motors.The stator of a two - phase AC servo motor is equipped with two distributed windings. These windings are electrically displaced from each other by 90 degrees. One of these windings is called the reference or fixed phase. It is powered by a constant - voltage source, ensuring a stable electrical input. The other winding is known as the contr