Harmonic suppressor is an iron-cored reactor and is used in the neutral ground connection of a generator so that third harmonic currents are reduced to safe value. If the third harmonics are not suppressed, they can cause dangerous overheating of grounding resistors of grounding transformers or erroneous operation of ground fault protective gear. The reactor is so designed that its [...]
The following points highlight the neutral grounding practices at every voltage level of an electric circuit. 1. Generally one-neutral ground is provided at each voltage level. Between generation and distribution there are several voltage levels. One ground is provided at each voltage level [Fig. 12.12 (b)] 2. The grounding is provided at source and not at load end. 3. Each [...]
There are two ways in which three-phase system can be operated and they are: 1. Isolated Neutral or Ungrounded Systems 2. Grounded Neutral Systems. Way # 1. Isolated Neutral or Ungrounded Systems: The main feature of an ungrounded system is its ability, in some cases, to clear earth faults without interruption. The self-clearing feature disappears when the length of the [...]
The following points highlight the four main methods used for grounding the neutral point of 3-phase electrical system. The methods are: 1. Reactance Grounding 2. Arc Suppression Coil Grounding (Or Resonant Grounding) 3. Voltage Transformer Grounding 4. Grounding Transformer. Method # 1. Reactance Grounding: Reactance grounding means grounding through impedance which is highly inductive. For circuits between 3.3 kV [...]
A house wiring or a factory wiring may be earthed in three different ways:- 1. Earthing through a Water Main 2. G.I. Pipe Earthing 3. G.I. Plate or Copper Plate Earthing. Type # 1. Earthing through a Water Main: Before connecting an earthing system to a water main, it must be ascertained that all throughout galvanized iron pipes have been [...]
In this article we will discuss about:- 1. Purpose of Installing Earth Leakage Circuit Breaker 2. Types of Earth Leakage Circuit Breaker or Earth Leakage Trip 3. Use. Purpose of Installing Earth Leakage Circuit Breaker: i. Use of Earth Leakage Circuit Breaker: According to Indian Standard it is not necessary to use an earth leakage circuit breaker at a place [...]