The differential relay measures the phasor difference between two similar electrical quantities (voltage-voltage or current-current). The rectifier bridge amplitude comparator is the most common static form for applications as a differential relay element. The block diagram for such a relay is shown in Fig. 4.16. Inputs I and II are supplied to the comparator. The output of the comparator (phasor [...]
A transient can be a unidirectional impulse of either polarity or a damped oscillatory wave with first peak occurring in either polarity. The term transients has been used in the analysis of power system variations to denote an event that is undesirable and momentary in nature. The notion of a damped oscillatory transient due to an RLC network is probably [...]
In this article we will discuss about the combined operation of various power plants. The run-off river power plant has a small pondage and uses water as it is available. The run-offs of river vary widely during the year-very large in rainy season and very low in dry season. As such the firm capacity of such plants is very low. [...]
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 [...]