Tricky but Easy Electrical Engineering!
Rated Normal Current: The rated normal current of a circuit-breaker is the r.m.s. value of the current which the circuit breaker can carry continuously and with temperature rise of the various parts within specified limits. The design of contacts and other current carrying parts in the interrupter of the circuit breaker are generally based on … Read more
In Switchyard different Bus Bar arrangements are used for evacuation of power generated but the two most used schemes are One and Half Breaker Bus System and Double Bus Bar arrangement. In high voltage Switchyard like in 400 kV Switchyard, One and Half Breaker Bus System is used due to many advantages of this scheme. … Read more
What is Circuit Breaker? Circuit Breaker is switch capable of making or breaking the circuit under no-load as well as on-load condition. It can make or break circuit either manually or by remote control. A Circuit Breaker in conjunction with Relay can break the circuit under fault condition. You may also like to read, Basic Principle … Read more
Magnetic Oil Level gauge or MOG is provided in a Power Transformer to indicate the level of insulating oil in the Conservator. A decrease in level of Transformer Oil in Conservator is an indication of leak and therefore MOG level is an important parameter to be monitored. Normally all Transformers are provided with an expansion … Read more
Restricted Earth Fault (REF) protection is basically a Differential Protection. The only difference in between the Differential Protection and REF Protection is that, latter protection is more sensitive as compared to the former protection scheme. In earlier posts we have already discussed Differential Protection of Transformer and various characteristics of Differential Protection. In this post … Read more
We have already discussed on the Potential Distribution across the various discs in a Suspension type Insulator. When Suspension type insulator is connected to hold a power conductor carrying electrical power at high voltage, a charging current will flow though the series connected Self Capacitors. As the charging current through each of the Capacitor (Porcelain … Read more
A Suspension Insulator is basically a string of number of porcelain disc connected in series though metallic link. It shall be noted that the number of discs in Suspension Insulator can be increased or decreased by adding extra discs or removing a disc. Figure-a below shows a typical Suspension Insulator. As discussed in above paragraph, porcelain … Read more
The overhead Transmission Line experiences vibrations in vertical plane. This vibration of Transmission Line in vertical plane can be categorized into two groups. 1) Aeoline Vibration 2) Galloping or Dancing of Conductors Aeoline Vibration is of high frequency and low amplitude. The frequency of vibration is of the order of 5 to 40 cycle/second while … Read more
Sag in overhead Transmission line conductor refers to the difference in level between the point of support and the lowest point on the conductor. As shown in the figure above, a Transmission line is supported at two points A and B of two different Transmission Towers. It is assumed that points A and B are … Read more
Electric Power can either be transmitted by means of AC or DC. Each system has their advantages and disadvantages. Therefore it is very crucial to have a comparative study of their merit and demerits and then decide which method should be adopted to transmit power. Advantages of DC Transmission: 1) The high voltage DC Transmission … Read more