In this article we will discuss about the operation and applications of amplidynes for controlling industrial motors. Operation of Amplidynes: This machine uses the cross-field principle and a single two-pole armature winding. The basic constructional features for a 2-pole armature amplidyne are shown in Fig. 2.5 (a). The poles, however, are divided and give the appearance of a four-pole field [...]
The main types of electrical system interfaces are: 1. Synchronous Machines 2. Asynchronous (Induction) Machines 3. Electronic Power Inverters. Type # 1. Synchronous Machines: Even though synchronous machines use old technology, are common on power systems, and are well understood, there are some concerns when they are applied in grid parallel Distributed Generation applications. They are the primary type of [...]
The following points highlight the eight main types of bus-bar arrangements. The types are: 1. Single Bus-Bar Arrangement 2. Single Bus-Bar Arrangement with Bus Sectionalization 3. Main and Transfer Bus Arrangement 4. Double Bus Double Breaker Arrangement 5. Sectionalized Double Bus Arrangement 6. One-and-a-Half Breaker Arrangement and Few Others. Type # 1. Single Bus-Bar Arrangement: This is the simplest arrangement [...]
Reactors in a power system can be located - (i) in series with generators; (ii) in series with feeders, or (iii) in bus-bars reactors(in ring system or in tie-bar system) as explained below. 1. Generator Reactors: When the reactors are inserted between the generator and the generator bus, as shown in Fig. 16.27 (a), the reactors are known as generator [...]
In this article we will discuss about the functions of surge capacitor, reactor and absorber in a power system. Damage caused by over-voltages depends not only on the amplitude of an incoming wave but also on the steepness of its wave front. The device, which reduces the steepness of the wave front of a particular surge and thus minimises the [...]