Now the turning of this century has comprehensively switching on to the use of sulphur Hexafluoride (SF6) circuit breakers instead of OCB and ABCBs, etc.
Generator Protection | Alternator Protection
Generator is the most important and costly equipment in power system. The cost is high because the alternator unit is accompanied by prime mover, excitation system, voltage regulator, cooling system etc. The protection system provided should therefore becomes elaborate and complex. As soon as the fault develops on an alternator, it should be immediately disconnected from the other generating plant to avoid the faulty machine from being fed by other sources. Following Table 1 shows abnormal conditions (faults) and protection schemes employed for the alternator.
What is Buchholz Relay? Working, Diagram & Construction
Buchholz Relay is a gas actuated relay. It is connected to the conservator as shown in Fig. 1.
Fig. 1: Location of Buchholz Relay.
What is Resistance Grounding? Explanation & Diagram
A resistance ‘R’ may be of metal or maybe liquid resistance (used 66 kV or above). Metal resistance is easy for maintenance but being slightly inductive the effect may create breakdown of insulation due to lightning.
What is Surge Absorber? Explanation & Types
Sudden rise in the voltage for a very short period on the power system is known as a voltage surge or transient voltage. When lightning strucks a line; the surge rushes along the line just as flood of water along a narrow valley.
What is Lightning Arrester (Surge Diverter)? Working, Diagram, Design & Types
Earthing screens and ground wires are suggested for protection against direct lightning strokes but they are unable to protect the equipment against travelling waves. The lightning arresters or surge diverters take care of the terminal equipments against such surges.
What is Valve Type Lightning Arrester? Working, Construction, Diagram, Limitations & Applications
Valve Type Lightning Arresters are suitable on High Voltage Power Lines. This is non-linear diverter.
What is Multi Gap Arrester? Working, Diagram & Construction
Multi gap Arrester is used for power lines voltage not exceeding 33 kV.
Fig. 1 : Multi gap Arrester
What is Vacuum Circuit Breaker? Working Principle, Construction, Diagram, Advantages & Applications
In this topic, you study Vacuum Circuit Breaker Working Principle, Construction, Diagram, Advantages & Applications.
What is Horn Gap Arrester? Working, Construction, Diagram, Limitations & Applications
Horn gap arrester is used at limited places due to its unreliability i.e. it is used as backup protection with the main arrestor.