disadvantages of static relays

These electronic static relays were the initial ones to be known in the classification of static relays. Working of Static Relay. Introduction to Static Relays: Characteristic Functions of Protection Relay: Characteristic Functions of Protection Relay elements using different operating principles. History of Relay: The static relay are next generation relays .The Solid Static relays was first introduced in 1960’s. 6. However, integrating an SSR rather than an EMR may result in an equal or even lower overall cost depending on the particular application, something we will discuss a little later. While it is possible to arrange for the d.c. supply to be generated from the measured quantities of the relay, this has the disadvantage of increasing the burden on the CT’s or VT’s, and there will be a minimum primary current or voltage below which the relay will not operate. Low burden. Static relays are those in which the designed response is developed by electronic or magnetic means without mechanical motion. The term ‘static’ implies that the relay has no moving mechanical parts in it. Fast Resetting. Unlike, electromechanical relays that have moving parts, solid state relays are static in nature thus have inbuilt components like transistors, diodes, capacitors, etc. Compared to the Electromechanical Relay, the Solid Static relay has longer life-span, decreased noise when operates and faster respond speed. The microprocessor based relays have minimum burden on the instrument transformers. More expensive than dry reed relays All faults below the oil in transformer result in the localized heating & breakdown of the oil, some degree of arcing will always take place in a winding fault & the resulting decomposition of it will release gases such as hydrogen, carbon monoxide & hydrocarbons. Figure 1 - Selection of static relays. Mercury-wetted reed relays are similar in construction and operation to dry reed relays, but a small amount of mercury is added to the glass tube to provide more consistent contact resistance. This directly affects the possible sensitivity of the relay. This filtered signal is given to rectifier where it is converted from AC into DC (Electronics equipments works on DC supply) RELAY: A Relay is a protection device that senses the fault in the circuit and gives a trip signal to the Circuit Breaker to isolate the faulty circuit. A scientist named Fitzgerald showed a carrier current test which conveys the … To understand simply it is like a brain in our human body, when the brain gives the sense the body parts are operate to do any work. Main advantages. is connected to transmission line and secondary is connected to some filter circuit. Handles more power than dry reed relays; Consistently low contact resistance Main disadvantages. Solid State relays are advantageous over electromechanical relays due to various factors. The primary of C.T. Working of Static Relay . A few of those are: Electronic Static Relay. Sensitivity. Greater sensitivity and high pickup ratio. Solid state relays come with a rather large and perhaps intimidating upfront price tag when compared to an electromechanical relay. There exist different types of static relays. Speed. List the advantages and disadvantages of static relays. The relay hardware consists of standard modules resulting in ease of service. Disadvantages or demerits: High burden level instrument transformers are required (CTs and PTs of high burden is required for operating the electromagnetic relays compared to static relays) The directional feature is absent in electromagnetic relays; Requires periodic maintenance and testing unlike static relays With static relays, tripping time of ½ cycle or even less can be obtained. What is static relay? Buchholz relay . 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