This is the first generation oldest relaying system and they have been in use for many years. The time which elapses between the instant when the actuating quantity becomes less than the reset value to the instant when the relay contacts returns to its normal position. In this article we will learn about different types of relay and what to use in you circuit to get the desired result. Very less amount of power is utilized in turning on a relay and it also has the ability to control something which draws a huge amount of power. Technical explanation for solidstate relays omron industrial. Slc 51e static overcurrent relay ge grid solutions online store. Static ac switches normally open circuit the circuit shown in figure an1007. The solid state relay static relay overview on photo.
This tutorial explains how to configure frame relay step by step. The static relay only gives the response to the electrical signal. Electromechanical and static relays have fixed wiring and the setting is manual. Multiple powerlogic device types on a communications link 26. Relay which means the solid static relays can perform tasks that the electromechanical relay can perform. Jan 30, 2018 in electrical systems, a static relay is a type of relay, an electrically operated switch, that has no moving parts. Ppt protection and relay schemes powerpoint presentation. This is not strictly the case for a static relay, as the output contacts are still generally attracted armature relays. Type of relay system general overview of static relays. The type slc51e relay is a rack mounted solid state overcurrent relay fo conjunction with other solid state relays, a test panel and a power supply in a. Bulletin 3030im9301r398 digital relay june 1998 contents. In most types of control systems, we can not avoid the presence of certain types of nonlinearities. The static network is so designed that it gives an output signal in the tripping direction whenever a threshold conditions reached.
Static relay elements and design computer applications to protective relaying. As such, power is amplified, voltages are adjusted or signals are electrically isolated. Alexander general electric co malvern, pa introduction distance functions have been in use for many years and have progressed from the original electromechanical types thr ough analog types and now up to digital types of functions. Based on operation mechanism protection relay can be categorized as electromagnetic relay, static relay and mechanical relay. Lastly, the mammoth relay on the far right is an automotive power relay, which is rated at 60 amps. Power system protection relays can be categorized into different types of relays. Also, the design, construction, working, applications, and also relay selection is explained in detail. The size of a iso micro relay is a 1 x 1 x 12 square 12 as thick as a mini relay. The bimetallic strips, heating coils and the current transformers are the important parts of the thermal relay. Types of relaysoverload protection relay,solid state. Rmi rvi abb 89 abb dl91f static line differential protection dl91 dl91f dl91 dl91f 90 abb dln 910f static differential protection relay dln 910f dln 910f. Actually, a relay is nothing but a combination of one or more open or closed contacts. Relay modules switch, isolate, and amplify signals reliably.
Staticrelays components of static relays block diagram of static relays types of static relays prepared by mr. The static relay is the next generation relay after electromechanical type. Numerical relays protection and control products for. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Protection and switchgear miet engineering college. Both types of relay control electrical circuits through a switch that is open or closed depending upon an electrical. In a static relay, the measurement is performed by static councils. Development and classification of static relays, different types of phase and amplitude capacitors, basic static relays used in protective scheme.
There are two basic classifications of relays electromechanical relays and solid state relays. They have earned a welldeserved reputation for accuracy, dependability, and reliability. Numerical relays are based on the use of microprocessors. The slave relay is an output device and does not function as a comparison or measuring device like a normal relay.
Static relays a static relay is the relay which uses solid state components like transistors,diodes etc. Early versions used discrete devices such as transistors and diodes in conjunction with resistors, capacitors, inductors, etc. Manufacturer asset type name technology description relex logical model relay version pattern version no. To start, let us first recall the basic definition of a linear control system. This circuit gives an output signal for the tripping of a circuit breaker. The solid static relays use analogue electronic devices instead of magnetic coils and mechanical components to create the relay characteristics. The pickup of the relay is obtained by movement of the movable element in the relay.
In electrical systems, a static relay is a type of relay, an electrically operated switch, that has no moving parts. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. U nderstand the types of static relays and its com ponents. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current.
An electromechanical relay, put simply, is a switch. Winner of the standing ovation award for best powerpoint templates from presentations magazine. In this article, the basics of a relay like energized relay and deenergized relay are explained in detail. In static relay, the comparison or measurement if electrical quantities is done by a static circuit.
The thermal relay works on the principle of the thermal effect of electrical energy. A distance relay operates whenever the distance seen by the relay is less than the prespecified impedance. Their design is based on the use of analogue electronic devices instead of coils and magnets to create the relay characteristic. The describing function is an approximate procedure for analyzing certain nonlinear control problems in control engineering. Static, three phase directional phase distance relay types sly81a and sly81b description the type sly81a relay is a three phase, first or second zone static phase distance relay. Different types of solid state relays ssr and their working. Types of protection relays are mainly based on their characteristic, logic, on. The relay which consists static and electromagnetic. Digital relay fundamentals mathematical background of digital relay. The protective relays are either single actuating quantity relays such as overcurrent, undervoltage, earth fault relay or double actuating quantity relays such as distance relays, differential relays. In electrical systems, a static relay is a type of relay, an electrically operated switch, that has no. Therefore, this document is intended to describe about a few basic types of relays that are popularly used in typical loadcontrol applications.
The block diagram of a static overcurrent time relay is shown in fig. An electrical switch which uses an electromagnet to move a switch from off position to on position instead of using a person to move switch is called as a relay. Kimbark disclosed a static overcurrent relay including a nonlinear voltage modifying circuit using zener diodes or the like for modifying the dc voltage applied to a series rc circuit as a function of the amount of overcurrent. Unit ii relay circuit static relay circuit using analog and digital ics for over current. The electromechanical relay operates when operating torquefence exceeds the restraining torqueforce. A single throw relay can control only one circuit i. One main difference between them is electromechanical relays have moving parts, whereas solid state relays have no moving parts. In such type of relays, the output is obtained by the static components like magnetic and electronic circuit etc. A relay is an electromagnetic switch that is used to turn on and turn off a circuit by a low power signal, or where several circuits.
The other physical quantities like heat temperature etc. Testing and maintenance of protective gear, protection against surge. The armature switches the contacts in synchronization. In conference paper cp621091, presented to the american institute of electrical engineers in june 1962, e. Static impedance relays comparing v and i are generally of hybrid comparator. Alexander general electric co malvern, pa introduction distance functions have been in use for many years and have progressed from the original electromechanical types thr ough analog types and now up. Circuit globe all about electrical and electronics. Types of relays the relay may be defined as an electrical device interposed between the main circuit and the circuit breaker in such a manner that any abnormality in the circuit acts on the relay, which in turn if the fault is dangerous then it causes the circuit breaker to isolate and so to remove the faulty element. Definition of protective relay a relay is automatic device which senses an abnormal condition of electrical circuit and closes its contacts. Testing and maintenance of protective gear, protection against surgesurge absorber, surgediverter. The electromagnet coil gets power through a switch or a relay driver and causes the armature to get connected such that the load gets the power supply.
If pure ac relays are used ac input, the input circuit is generally nothing more than a visual switching status. Unit i introduction of relays a relay comprises of an. Linear control systems are those where the principle of superposition if the two inputs are applied simultaneously, then the output will be the sum of two outputs is applicable. Different types of solid state relays ssr and their working classification of solid state relays ssr ssr definition. Mar 16, 1976 in conference paper cp621091, presented to the american institute of electrical engineers in june 1962, e. Mar 25, 2017 different types of solid state relays ssr and their working classification of solid state relays ssr ssr definition.
In static relays it is advantageous to choose a circuit accommodating a wide range of alternative inverse time characteristics, precise minimum operating levels, definite minimum times and additional high set features, if necessary. Numerical relays protection and control products for power. Operating state set when current flows through coil a, the electromagnet made of. Working of relayshow relay works,basics,design,construction. The operation of a normally closed relay is the same to that of a normally open relay, except backwards. The term static implies that the relay has no moving parts. A solid state relay may be defined as an electrical switch that changes its state when an external voltage is applied to it. The solid static relays was first introduced in 1960s. Solid state relay ssr types of ssr relays construction.
Introduction of static relays began in the early 1960s. According to the principle of operation and construction, the relay may be classified such as the electromagnetic attraction type, electromagnetic induction type, electrodynamic type, moving coil type, electrothermal type, physics electric type, and static relays. A system for which there is a nonlinear relationship between input and output, that does not involve a differential equation is called a static nonlinearity. Their design is based on the use of analogue electronic devices instead of coils and magnets. The solid state relay static relay overview idc technologies. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof relays are used where it is necessary to control a circuit by an independent lowpower signal. Electromechanical relays these type of relays are made of a coil that induces a magnetic field when it get energized and moves the armature, which closes of opens the contacts.
Relay seminar report with ppt and pdf free download. Static relays relay rectifier free 30day trial scribd. New developments in commercial relay manufacture are also included. These latter types of applications are described in detail in phase control using thyristors an1003. In general, static relays are having a dc polarized relay as slave relay. Basler electric be127 solid state protective relay, overunder voltage history of relay the static relay is the next generation relay after electromechanical type. It incorporates the latest developments in semiconductor technology and its applications to power system protection. It is available with ratings of 60 hertz, five amperes 5 amps. Static relays are contrasted with electromechanical relays, which use moving.
A new chapter on microprocessor applications to protection has been added. Latching relays are the same as the singleside stable relays described previously except that the core, yoke, and armature are made from semihard magnetic material and there are at least two coils in the relay. There are several different types of electromechanical relays, and which. Basically a relay consists of an electromagnet coil, an armature, a spring and a series of electrical contacts. By design and construction they ensure potential isolation between the actuating circuit and the operating circuit, in the deenergized state, between the contact input and output. Iso micro relay types below are two popular micro iso relay configurations. Static relays are contrasted with electromechanical relays, which use moving parts to create a switching action. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof. In a protection relay, the term static refers to the absence of moving parts to create the relay characteristic.
The other types of input such as heat, light, magnetic field, traveling waves, etc. In other words, when the relay control coil is not energized, the relay. Relays are electrical parts that are used when a lowpower signal is needed in order to control a circuit, or when a number of circuits need to be controlled. Types of protection relays are mainly based on their characteristic, logic, on actuating parameter and operation mechanism. White paper on different types of relays the relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. All dil contactor relays have doublebreak contacts. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. The term static implies that the relay has no moving mechanical parts in it. Applications of digital relay advanced topics in relaying system. The book is a thoroughly revised and updated second edition of a successful text. These contacts in turns close and complete the circuit breaker trip coil circuit hence make the circuit breaker trip. Types of electrical protection relays or protective relays. The rsr72 type relay for restart and reacceleration is deigned to perform the automatic motor restarting, after control and protection device opening, as a consequence of a momentary line voltage interruption or dropout. The supervision relay type tcs is intended for a continuous supervision of circuit breaker trip circuit and gives an alarm for loss of auxiliary supply, faults on the trip coil or its wires independent of the breaker position, faults on the breaker auxiliary contacts and faults in the supervision relay.
Jun 08, 2019 types of protection relays are mainly based on their characteristic, logic, on actuating parameter and operation mechanism. Feb 04, 2015 static relays a static relay is the relay which uses solid state components like transistors,diodes etc. Industrial relay system from coupling relay to replacement for small power contactors coupling relay between the controller and the field the rif0 and rif1 relay modules are used in particular to safely couple signals between the controller and the field. All the relays react to voltage or current with the end goal that they open or close the contacts or circuits. Different types of relays, their construction, operation. Relays are electrical parts that are used when a lowpower signal is needed in order to control a circuit, or when a number of circuits need to be controlled by one signal. A big difference between conventional electromechanical and static relays is how the relays are wired.185 726 1217 1037 966 183 344 107 1105 126 551 386 82 1064 1155 1507 885 242 367 510 259 1285 1292 776 1346 891 435 1286 198 327 973 1065 1166 1489 17 556 1049 345 1031 1394 201 43 527