Category: STATIC PROTECTIVE RELAY

Hall Effect Relay Circuit

Hall Effect Relay Circuit: Hall Effect Relay Circuit is utilized to give a phase comparator. The effect is very predominant in certain semiconductors such as indium arsenide, indium antimonide, indium phosphate, etc. Figure (9.5) illustrates the basic Hall generator where the Hall crystal in the form of a slab carries current in the X-direction and […]

Transistor Relays

Transistor Relays: These are the most widely accepted type of static relays, so much so that when we say static relays, we can safely infer transistor relays only. The transistor which acts like an electronic valve can overcome most of the limitations posed by the electronic valves and thus has made possible to develop the […]

Transductor Relay

Transductor Relay (Magnetic Amplifier Relay): Transductor Relay – Since relays now have to perform much more complicated functions, many types tend to become very complex mechanically, and hence costly, to make and difficult to test and to maintain. The transductor controlling a simple slave relay, makes it possible to reduce a complex electromechanical device which […]

Electronic Relays

Electronic Relays: Electronic Relays – These were the first to be developed in the series of static relays. They date back to early 1928 when Fitzgerald presented a carrier current pilot relaying which constituted unit protection of the transmission line. Subsequently a series of electronic circuits for most of the common types of protective gear […]

Static Relays Basics

Static Relays Basics: A Static Relays Basics refers to a relay in which the measurement or comparison of electrical quantities is done in a static network which is designed to give an output signal in the tripping direction when a threshold condition is passed. The output signal operates a tripping device which may be electronic, […]