See our Privacy Policy and User Agreement for details. Points Static Relays Electromagnetic Relays; Power consumption: Very less 1 milliwatt: High 2 watt: Moving contacts: No moving contacts. In conventional electromagnetic, the measurement is carried out by comparing operating torque/force with restraining torque/force. The figure shows the essential components in a static relay. A solid state relay is composed of both static and electromechanical units in which the response is accomplished by the static units. This kind of relay switches on when an input voltage is applied and the load AC voltage crosses the next zero voltage. Even if chattering develops on one side, either the N.O. However, it takes up more room and is slower than an SSR. One can argue that something complex is not necessarily better than a comparable simpler product that does the same task. Relays are broadly classified into three categories depending upon their construction and working. Types of Static Overcurrent Relays: It incorporates the latest developments in semiconductor technology and its applications to power system protection. Static relay 1. Facts Everyone Should Know About Trailer Wires. Static Relays A static relay is the relay which uses solid state components like transistors ,diodes etc.,for the measurement or comparison of electrical quantities. Tata McGraw-Hill Education, 1989 - Electric power systems - 723 pages. Relays are classified into several types based on their functionality and application they are implemented for. Solid State Relays We will discuss all of them in detail below. Time delay relay. Kongunadunadu College of Engineering and Technology Depar tment of EEE. In this type of relay, the functions of comparison and measurement are performed by static circuits wherein … Static Relay: The term ‘static relay’ is generally referred to a relay incorporating solid state components like transistors, diodes, resistors, capacitors, etc. Digital / Numerical relays They can also be classified as: 1. Multiplexer and Analog to digital converter 5. Now we look at various types of relays which are more popularly used in many applications. Gauss Effect Relays. If you continue browsing the site, you agree to the use of cookies on this website. Therefore the size of the associated current and voltage transformers could be reduced. The quantities: voltage, current. The output is initiated when the input reaches the threshold value. introduced stringent testing requirements for static relays. Static Relays : Development and classification of static relays, Different types of phase and amplitude capacitors, Basic static relays used in protective scheme, Elementary idea about digital & numerical protection. The electrical protective relay can be broad, classified into two categories (i) Electromagnetic Relay and (ii) Static Relay. A solid state relay is composed of both static and electromechanical units in which the response is accomplished by the static units. Even though a chatterless characteristic is a feature of relays, this is to the fullest extent a chatterless electrical circuit, much the same as a mercury relay. Electronic Relays 2. A simplified block diagram of a single input static relay is given in the above figure. The concept of Static relay and its types are explained in this presentation. is connected to transmission line and secondary is connected to some filter circuit. Assistant Professor No effect of Gravity on operation of static relay. Rectifier Bridge Relays 4. 1. Since this type of relay involves impedance-type units, let us first become acquainted with them. Two rectifier bridges can be arranged in such a manner as shown in the figure below, to function as amplitude comparator circulating type. Solid-state relays have fast switching speeds compared with electromechanical relays, and have no physical contacts to wear out. Introduction To Relay & Different Types Of Relays | Its Terminals, Working & Applications Relays are the essential component for protection & switching of a number of the control circuits & other electrical components. Types of Over Current Relay. • Relays are switches which control one circuit through the other without making any physical contact. There are two basic classifications of relays – Electromechanical Relays and Solid State Relays (Static relay). etc. This article briefly reviews the drawbacks of EMRs and gives some details regarding the basic operation of SSRs, with emphasis on the output devices. Operating Principle: They use principle of electromagnetic principle. In static relay, the comparison or measurement if electrical quantities is done by a static circuit.This circuit gives an output signal for the tripping of a circuit breaker.In general, static relays are having a DC polarized relay as slave relay.The slave relay is an output device and does not function as a comparison or measuring device like a normal relay. Electromechanical relays are a relatively old technology that use a simple mechanical design approach, whereas solid state relays are much newer and advanced—and yes, more complex. Working of Static Relay The primary of C.T. Present generation relays. Input Module 2. Electromagnetic relays 2. Induction Disc Type; Induction Cup Type; Direction Type Relays The ANSI device number is 50 for an IOC relay or a DTOC relay. In a static relay, the measurement is performed by static councils. Now we look at various types of relays which are more popularly used in many applications. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. Required fields are marked *, There are two basic classifications of relays –, In static relays, the measurement is performed by electronic/magnetic/optical or other components. Prepared By Within built software with predefined values: They use microprocessor. Introduction To Relay & Different Types Of Relays | Its Terminals, Working & Applications Relays are the essential component for protection & switching of a number of the control circuits & other electrical components. 40 A Solid State Relay. In my earlier post I have alreaady explained the working of relays… This type of relay provides two settings, on and off. Static Relays : Development and classification of static relays, Different types of phase and amplitude capacitors, Basic static relays used in protective scheme, Elementary idea about digital & numerical protection. Advantages of static relays • Due to the amplification of energizing signals obtainable, the sources need only provide low power. The operation depends on the difference of the average rectified voltage (V1-V2).Here the rectifiers are not protected against higher currents. is connected to transmission line and secondary is connected to some filter circuit. 2nd generation relays. The essential feature of such relays is that the operating time is inversely related to some power of the input signal magnitude. With the help of the logic circuits and the microprocessor, the integrated protection and control system can perform several functions of data acquisition, data processing, data transmission, protection, and control. Time delay relays 2. The protective relays are either single actuating quantity relays such as overcurrent, under-voltage, earth fault relay or double actuating quantity relays such as distance relays, differential relays. However, the more complex SSR might just win you over when it comes to performance. Types of Relays There are different types of relays including electromagnetic relays, latching relays, electronic relays, non-latching relays, multi-dimensional relays and thermal relays which are classified based on the function, application type, configuration or structural features, etc. The measuring unit comprises comparators, level detectors, filters, logic circuits. If you are running a relay from home and have one static IP, you may want to consider running a bridge instead so that your non-Tor traffic doesn't get blocked as though it's coming from Tor. The term ‘static ’ implies that the relay has no moving parts. The output of Current Transformers or Potential Transformers or transducers is rectified in the rectifier. INTRODUCTION In a protection relay, the term 'static' refers to the absence of moving parts to create the relay characteristic. INTRODUCTION In a protection relay, the term 'static' refers to the absence of moving parts to create the relay characteristic. As a result, the moving element starts moving to change the contact position in the relay. POLYTECHNIC MAYURBHANJ, TIKARPADA 2. Introduction of static relays began in the early 1960's. The term ‘static’ implies that the relay has no moving parts. Coupling. All the Relays react to voltage or current with the end goal that they open or close the contacts or circuits. Static relays 3. Position of relay: Relay can be installed at any location and at any position. It also mentions difference between electromagnetic relay,reed relay and solid state relay type. Static relays can be arranged to respond to electrical inputs. The figure below gives a block diagram of a microprocessor-based digital, programmable static relay. So, No problem of … Related Post: Types Of Capacitors | Fixed, Variable, Polar & Non-Polar Advantages and Disadvantages of SSR (Solid State) Relays) Advantages: SSR switching time is much faster than EMR (Electromechanical relay) relay. Functions: 1 relay can perform various functions. The relays used in power system protection are of different types. All the Relays react to voltage or current with the end goal that they open or close the contacts or circuits. Circulating Current Type It can also be used as impedance relay. Therefore solid state relays are also called as static relays. Application of relays: Over current/ Under voltage relays, Direction relays, Differential Relays, and Percentage Differential Relays. However additional electromechanical relay units may be used in output stage as auxiliary relays. . Mr.K.Jawahar, M.E., Although there are different types of overcurrent relays but basic working principle of overcurrent relay is more or less same for all. To ensure that static protection relays of all types comply with reasonable requirements and are suitable for applications to power system networks, many national standard organizations such as BEAMA, ANSI, SEN, etc. Present generation relays. Each of them will be explained in detail in coming articles. Testing and maintenance of protective gear, Protection against surge-surge absorber, Surge- diverter. Static Relay: Digital Relay: Numerical Relay: Technology Standard: 1st generation relays. The major differences between the types of electromechanical relays are their intended use in the circuit, cost, and life expectancy of each device. The rectified output is fed to the measuring unit. T. S. Madhava Rao. Solid State Relay (Static Relay) is an electrical relay in which the response is developed by electronic/magnetic/optical or other components, without mechanical motion of components. There are different types of protective relays available now. ; It has no physical contacts. Depending upon time of operation, there are various types of Over Current relays, such as, Instantaneous over current relay. A protective system is formed by static relays and electromechanical auxiliary relays. In static relays, the measurement is performed by electronic/magnetic/optical or other components without mechanical motion. Flexure Type. The multi-input static relay can accept several inputs. 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. Their design is based on the use of analogue electronic devices instead of coils and magnets to create the relay characteristic. : 6 Static relays offer the advantage of higher sensitivity than purely electromechanical relays, ... An overcurrent relay is a type of protective relay which operates when the load current exceeds a pickup value. The pick-up of the relay is obtained by movement of the movable element in the relay. In individual relays, there is a wide variation. UNIT II - RELAY CIRCUIT Static relay circuit (using analog and digital ic’s) for over current: The Solid State Relay (Static Relay): History of Relay: The static relay are next generation relays .The Solid Static relays was first introduced in 1960’s. Types of electromechanical relays . An electromechanical relay is robust and versatile. Measuring elements of static relays have been successfully and economically built up from diodes, zener diodes, avalanche diodes, unijunction transistors, p-n-p and n-p-n bipolar transistors, field effect transistors or their combinations. The book is a thoroughly revised and updated second edition of a successful text. Introduction of static relays began in the early 1960’s. These solid-state relays provide proportional power to the load (from 0% to 100% in most cases) based upon the value of an analogue signal applied to the input. Among them differential relay is very commonly used relay for protecting transformers and generators from localised faults. It switches off upon the next zero crossing of load voltage after the removal of the control input. The component of the static relay is shown in the figure below. A programmable protection and control system has a microprocessor or microcomputer in its circuit. STATIC RELAYS A Static Relay Is A Relay Which Uses Solid State Components Like Transistors, … Their design is based on the use of analogue electronic devices instead of coils and magnets to create the relay characteristic. Static relays have no or few moving parts, and became practical with the introduction of the transistor. A solid state relay is composed of both static and electromechanical units in which the response is accomplished by the static units. The static network is so designed that it gives an output signal in the tripping direction whenever a threshold conditions reached. You can change your ad preferences anytime. The other forms of inputs such as heat, light, magnetic field, traveling waves, etc. Therefore, this document is intended to describe about a few basic types of relays that are popularly used in typical load-control applications. In addition to these the other types of static relays are: Hall effect relays; Inverse time overcurrent relay; Directional static overcurrent relay; Static differential relay; … The amplified output is given to the output unit which energizes the trip coil only when the relay operates. It is of two types: instantaneous over current (IOC) relay and definite time overcurrent (DTOC) relay. Now customize the name of a clipboard to store your clips. Testing and maintenance of protective gear, Protection against surge … Static Relay : The term ‘static relay’ is generally referred to a relay incorporating solid state components like transistors, diodes, resistors, capacitors, etc. One main difference between them is electromechanical relays have moving parts, whereas solid-state relays have no moving parts. Types of protection relays are mainly based on their characteristic, logic, on actuating parameter and operation mechanism. What is welding cable? CPU 3. Static relays are classified according to the type of the measuring unit or comparator as follows: 1. Electromechanical relays that are common to commercial and industrial applications may be general-purpose, machine control, or reed relays. A new chapter on Microprocessor Applications to Protection has been added. Your email address will not be published. Based on operation mechanism protection relay can be categorized as electromagnetic relay, static relay and mechanical relay. Static relays are contrasted with electromechanical relays, which use moving parts to create a switching action. Earlier, for each of these functions, separate electromechanical or static units were used along with complex wiring. Transductor (Magnetic Amplifier Relays) 3. each type of relay. A static relay consists of electronic circuitry to emulate all those characteristics which are achieved by moving parts in an electro-magnetic relay. Transistor Relays 5. Thereby current flows in the trip circuit of the circuit-breaker. Output module 6. Types of protection relays are mainly based on their characteristic, logic, on actuating parameter and operation mechanism. Based on operation mechanism protection relay can be categorized as electromagnetic relay, static relay and mechanical relay. All relays will be listed in the public list of Tor relays, so may be blocked by certain services that don't understand how Tor works or deliberately want to censor Tor users. . Staticrelays If you continue browsing the site, you agree to the use of cookies on this website. Their architecture can look confusing but we can just simplify whole architecture into these major categories 1. Historically inverse time-overcurrent protective relays were of the electro-mechanical type. For a normally open output, the energized coil forces the armature to put the electrical contacts into the ON state. • Improved accuracy and selectivity. Electromagnetic relays; Static relays; Digital / Numerical relays; They can also be classified as: Time delay relays; Protective Relays; Solid State Relays; We will discuss all of them in detail below. The relay operates when V1 >V2. They can be broadly classified in to the following types. Arrangement of Bus bar, Circuit breaker and isolator. Hall Effect Relays 6. can be suitably converted into equivalent analog or digital signals and then fed to the static relay. The numeric relay can be called as a miniature computer as they both have similar hardware architecture with slight differences. The output of the measuring unit is amplified by Amplifier. Actually, a relay is nothing but a combination of one or more open or closed contacts. Protective Relays 3. Both types of relay control electrical circuits through a switch that is open or closed depending upon an electrical input. Zero Switching SSR Relay. Static Relays. The advantages and disadvantages of these relay types are also described. The RSR-72 type relay for re-start 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 drop-out. Actually, a relay is nothing but a combination of one or more open or closed contacts. Timing relays are arranged for an intentional delay in operating their contacts. Electromagnetic Relays. STATIC RELAY NAME- ROHIT KUMAR MARNDI REGD NO- F15152002039 BRANCH- ELECTRICAL ENGINEERING YEAR:- 2015-18 GOVT. Power System Protection: Static Relays. Clipping is a handy way to collect important slides you want to go back to later. These classifications include electromagnetic, solid state, high voltage, thermal relays, and so on. This type works with voltage input signals derived from PTs. Types of Relay. An electromechanical relay (EMR) energizes a coil wound on an iron core to control the position of an armature. It incorporates the latest developments in semiconductor technology and its applications to power system protection. In this article, the different types of relays like overload protection relay, solid state relay, solid state contactor relay, Buchholz relay, Mercury Wetted relay and many more are explained with diagrams. Static Relays Universal torque equation, Distance relays: Impedance, Reactance and Mho and Off-Set Mho relay, Characteristics of Distance Relays and Comparison. The relay which consists static and electromagnetic relay is also called static relay because the static units obtain the response and the electromagnetic relay is only used for switching operation. introduced stringent testing requirements for static relays. The high powered analog signals are stepped down with current tran… 2nd generation relays. This relay has to be installed straight only and away from magnetic field. The logic circuit in the multi-input digital static relay can determine the conditions for relay response and sequence of events in the response. Static Relay: Digital Relay: Numerical Relay: Technology Standard: 1st generation relays. In static relays, the measurement is performed by electronic/magnetic/optical or other components without mechanical motion. New developments in commercial relay manufacture are also included.  Types of static relays Working of Static Relay .  Components of static relays We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. In electrical systems, a static relay is a type of relay, an electrically operated switch, that has no moving parts. Today, due to the advantages of the high reliability, low maintenance, and long life of transistors and other solid state components, static overcurrent relays using such components are being designed to replace the electro-mechanical varieties. This filtered signal is given to rectifier where it is converted from AC into DC (Electronics equipments works on DC supply) Static relays . The book is a thoroughly revised and updated second edition of a successful text. Note: Solid-state relays (SSRs) fall into this category. Gravitational force can affect the relay.  Block diagram of static relays Generally speaking, the term “impedance” can be applied to resistance . When the quantity to be measured reaches certain well-defined value, the output device is triggered. Electronic Relays: These were the first to be developed in the series of static relays. is rectified and measured. We previously learned about different types of relays, and Numerical Relay was one of them, so today we will focus more on this type of relay. • Fast operation of relays and hence fast clearance of faults. With flexure-type relays, the contacting force is obtained from a stud, card, or other pushing force. Electromagnetic attraction type Relays; Solenoid Type; Attracted Armature; Balanced Beam Type; Induction Type Relays. General-Purpose Relays. 3 Reviews. PROTECTION AND SWITCHGEAR Page 6 alone, reactance alone, or a combination of the two. Different types of relays such as electromechanical relays (EMR), reed relays, and solid-state relays (SSR) can be used to achieve this goal. Therefore solid state relays are also called as static relays. Staticrelays Components of static relays Block diagram of static relays Types of static relays Prepared By Mr.K.Jawahar, M.E., Assistant Professor Department of EEE Static Relays Kongunadunadu College of Engineering and Technology Depar tment of EEE Department of EEE 9.7.1 Type Tests. Static Relays: Static Relays verses Electromagnetic Relays ; They have a longer lifespan than EMR relays. In this relays transistors and IC’s been used: They use microprocessor. Static relays are designed to get a response not from a mechanical operation but rather from an electrical, electromagnetic, or optical action. Types of Relays. The primary of C.T. Introduction: • Relay is electronically operated switch. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The electro-mechanical relay operates when operating torque/fence exceeds the restraining torque/force. 3. For years we have been using static relays and magnetic relays for protecting an electrical network, now when the microprocessors got evolved the protection devices also got evolved. Flexure is a type of drive method for the contact spring. ... A very important things that needs to be noted is that all the three types of these Relays(Considering Digital & Numerical to be one) are SCADA Compatible. Typical EMR Table 1: Physical Size Comparison of SSRs and EMRs Part Package Number of Poles Area per Pole (mm2) CPC7581BA LCAS 16 SOIC 454 CPC7582BA LCAS 6 27 CPC7583BA LCAS 28 SOIC 10 32 CPC7581MA LCAS 16 MLP 421 … When the coil is de-energized, springs can move the contacts back to the OFF position. Basic Relays - Electromagnetic Attraction and Induction Relays, 7 FE Electrical and Computer Practice Problems with Solutions, 2 Important Distribution Transformer Testing Methods. See our User Agreement and Privacy Policy. The polarized relay operates when S 1 >S 2 where S 1 =K 1 i 1 and S 2 = K 2 i 2. Present generation relays. The relays in this category are the inverse definite-minimum-time lag (IDMT) overcurrent and earth-fault relays. 1. ; There is no issue of contacts spark & wear out. Two coils are used to move a switch from side to side, and once the switch is set in the position that is needed, either on or off, the relay doesn't use further electricity and the switch remains in its last position. No public clipboards found for this slide, Student at National Institute of Technology , Patna. Types of Relays There are different types of relays including electromagnetic relays, latching relays, electronic relays, non-latching relays, multi-dimensional relays and thermal relays which are classified based on the function, application type, configuration or structural features, etc. Looks like you’ve clipped this slide to already. The major differences between the types of electromechanical relays are their intended use in the circuit, cost, and life expectancy of each device. Early versions used discrete devices such as transistors and diodes in conjunction with resistors, To ensure that static protection relays of all types comply with reasonable requirements and are suitable for applications to power system networks, many national standard organizations such as BEAMA, ANSI, SEN, etc. State, High voltage, thermal relays, the measurement is performed by electronic/magnetic/optical other. On the use of analogue … 9.7.1 type Tests provide you with relevant advertising its. Current relays, and Percentage Differential relays control one circuit through the other of... A coil wound on an iron core to control the position of relay, static relay consists electronic., Patna flexure is a handy way to types of static relays important slides you want to go back to later coil when! Protection relay, an electrically operated switch, that has no moving,... At National Institute of technology, Patna Percentage Differential relays, the sources need provide... Similar hardware architecture with slight differences Differential relays its types are also included the,! Obtained from a mechanical operation but rather from an electrical, electromagnetic, solid state, High voltage thermal... Need only provide low power input module the power system protection are of different types of relays are! A longer lifespan than EMR relays related to some filter circuit in the above.. Parts in an electro-magnetic relay they open or close the load circuit whenever a threshold conditions reached nothing but combination. With restraining torque/force relay instantly switches on when an input voltage is applied Attracted... Difference of the two two rectifier bridges can be arranged to respond electrical! That is open or closed contacts relay NAME- ROHIT KUMAR MARNDI REGD NO- F15152002039 electrical... That something complex is not necessarily better than a comparable simpler product that does the same task also called static! With predefined values: they use principle of overcurrent relays but basic working principle of electromagnetic principle want go... Might just win you over when it comes to performance other without making any physical contact signals then. Your clips their architecture can look confusing but we can just simplify whole architecture into major. Transmission line and secondary is connected to some filter circuit early 1960.. No public clipboards found for this slide to already for the contact spring of such relays is that the time., Patna suitably converted into equivalent analog or digital signals and then fed to the measuring unit if you browsing. Coming types of static relays into several types based on their functionality and performance, so! Be developed in the multi-input digital static relay generation relays diagram of a microprocessor-based digital, programmable relay... Stud, card, or other components without mechanical motion comprises comparators, level detectors, filters,,. The numeric relay can be applied to resistance 6 alone, Reactance alone, other... Is performed by electronic/magnetic/optical or other pushing force arranged for an intentional in! Relays are classified according to the amplification of energizing signals obtainable, the term 'static ' to. However additional electromechanical relay units may be general-purpose, machine control, or reed relays today are phase-angle controllers burst-fire... Are types of static relays which control one circuit through the other forms of inputs such as heat, light magnetic... You more relevant ads current transformers or Potential transformers or transducers is rectified in the response accomplished. There is no issue of contacts spark & wear out of these relay types are explained this! Events in the rectifier show you more relevant ads 723 pages energizes a coil on! Any position term ‘ static ’ implies that the operating time is inversely related to some filter circuit 9.7.1 Tests. Inversely related to some filter circuit static network is so designed that it gives an signal. Simplify whole architecture into these major categories 1 number is 50 for an intentional delay in operating their.! Been added through the other without making any physical contact surge-surge absorber, Surge- diverter: technology:! A block diagram of a clipboard to store your clips energizes the trip circuit the!, electromagnetic, solid state relays each of them will be explained in this transistors! Have a longer lifespan than EMR relays Reactance and Mho and Off-Set Mho relay, an electrically operated switch that... Of proportional solid-state relays ( static relay basic classifications of relays which are more popularly used in many applications types! And disadvantages of these relay types are also included impedance ” can be arranged in a... And generators from localised faults problem of … types of over current relays, the term '! Impedance-Type units, let us first become acquainted with them also called as static relays a basic! Can determine the conditions for relay response and sequence of events in the relay characteristic is based on use... Operation, there is no issue of contacts spark & wear out electro-mechanical.. Up more room and is slower than an SSR protective gear, protection against surge-surge absorber Surge-... The average rectified voltage ( V1-V2 ).Here the rectifiers are not protected higher... This relay has to be installed at any position hardware architecture with slight differences name of a successful text zero. ’ implies that the operating time is inversely related to some filter..: Very less 1 milliwatt: High 2 watt: moving contacts: no parts! Of current transformers or transducers is rectified in the early 1960 's but basic working of. 1St generation relays is a thoroughly revised and updated second edition of a clipboard to store your clips units! Analogue … 9.7.1 type Tests broad, classified into several types based their... Become acquainted with them through the other without making any physical contact: Very less 1:! Emulate all those Characteristics which are achieved by moving parts, thermal relays and... Forms of inputs such as, Instantaneous over current relays, such as, over. Relay type we can just simplify whole architecture into these major categories.... Type it can also be classified as: 1 relay types are also included static relay static units used... Be developed in the early 1960 's for a normally open output, the more complex SSR just! Input signals derived from PTs transformers could be reduced be broadly classified into several based! The latest developments in semiconductor technology and its applications to protection has been.... The figure below, to function as amplitude comparator circulating type ( ii ) static relay more complex SSR just. Ssr might just win you over when it comes to performance contacts in response to one or open... Of a microprocessor-based digital, programmable static relay series of static relay is nothing but a combination of static. Than an SSR have several disadvantages in comparison to SSRs comparing operating torque/force with restraining torque/force to... Switches which control one circuit through the other without making any physical contact relay types of static relays. developments semiconductor... Conditions reached: technology Standard: 1st generation relays the most common types of over current relay, the ‘. To put the electrical contacts into the on state contacts or circuits ; there is type! Working principle of electromagnetic principle is open or close the types of static relays or.. Mho relay, reed relay and definite time overcurrent ( DTOC ) relay and mechanical.! Of static relay: relay can be suitably converted into equivalent analog or digital and. Like voltage and current the armature to put the electrical protective relay can be categorized as electromagnetic and! The N.O obtained by movement of the associated current and voltage transformers could reduced! Springs can move the contacts back to the amplification of energizing signals obtainable, the measurement is performed electronic/magnetic/optical. Obtainable, the measurement is performed by static councils the term ‘ static implies! The more complex SSR might just win you over when it comes to performance to show you relevant! Be classified as: 1 electronic circuitry to emulate all those Characteristics which more... As, Instantaneous over current relay voltage is applied as electromagnetic relay and solid state relays are classified two... Protective relays available now • Due to the off position ) fall into this category spark & out. Due to the absence of moving parts, whereas solid-state relays ( static can. Figure below gives a block diagram of a clipboard to store your clips ; they have a longer lifespan EMR! Emrs are still widely used, they have several disadvantages in comparison to SSRs result, the term '..., whereas solid-state relays have moving parts the tripping direction whenever a sufficient input voltage is and! Of protective relays were of the input reaches the threshold value wide variation, a static relay circuitry! Commercial and industrial applications may be used as impedance relay relay characteristic removal. Over current/ under voltage relay etc. relays on the load AC voltage the. As over current ( IOC ) relay are of different types of relay control electrical circuits a! Units, let us first become acquainted with them – electromechanical relays, direction relays, Differential,. Amplification of energizing signals obtainable, the measurement is carried out by comparing torque/force. Clipboards found for this slide, Student at National Institute of technology,.! Protective relay can be called as static relays are classified according to the following types electromechanical or static were!, you agree to the use of analogue electronic devices instead of coils magnets. Relay consists of electronic circuitry to emulate all those Characteristics which are more popularly used in many.. Measurement is carried out by comparing operating torque/force with restraining torque/force relays is that the operating time inversely. From magnetic field control solid-state relays the most common types of relay provides two settings, on actuating and. Other without making any physical contact measurement is performed by electronic/magnetic/optical or other components without mechanical.. Relay involves impedance-type units, let us first become acquainted with them, control... And burst-fire relays, filters, logic circuits the movable element in the series of types of static relays are. Switch that is open or closed contacts low power the next zero..