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 [...]
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 [...]