Static relays are classified according to the type of the measuring unit or comparator as follows: 1. 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. See our User Agreement and Privacy Policy. In this type of relay, the functions of comparison and measurement are performed by static circuits wherein … The quantities: voltage, current. Testing and maintenance of protective gear, Protection against surge … In conventional electromagnetic, the measurement is carried out by comparing operating torque/force with restraining torque/force. 9.7.1 Type Tests. Types of Static Overcurrent Relays: Actually, a relay is nothing but a combination of one or more open or closed contacts. Therefore, this document is intended to describe about a few basic types of relays that are popularly used in typical load-control applications. Digital / Numerical relays They can also be classified as: 1. There are different types of protective relays available now. Therefore solid state relays are also called as static relays. Static Relays: Static Relays verses Electromagnetic Relays The pick-up of the relay is obtained by movement of the movable element in the relay. 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. A solid state relay is composed of both static and electromechanical units in which the response is accomplished by the static units. You can change your ad preferences anytime. is connected to transmission line and secondary is connected to some filter circuit. A new chapter on Microprocessor Applications to Protection has been added. Now we look at various types of relays which are more popularly used in many applications. A solid state relay is composed of both static and electromechanical units in which the response is accomplished by the static units. One main difference between them is electromechanical relays have moving parts, whereas solid state relays have no moving parts. The electro-mechanical relay operates when operating torque/fence exceeds the restraining torque/force. STATIC RELAYS A Static Relay Is A Relay Which Uses Solid State Components Like Transistors, … The figure below gives a block diagram of a microprocessor-based digital, programmable static relay. It incorporates the latest developments in semiconductor technology and its applications to power system protection. Static Relay : The term ‘static relay’ is generally referred to a relay incorporating solid state components like transistors, diodes, resistors, capacitors, etc. These classifications include electromagnetic, solid state, high voltage, thermal relays, and so on. With flexure-type relays, the contacting force is obtained from a stud, card, or other pushing force. Types of Relays. The figure shows the essential components in a static relay. However additional electromechanical relay units may be used in output stage as auxiliary relays. (1 relay can be used as over current relay, under voltage relay etc.) STATIC RELAY NAME- ROHIT KUMAR MARNDI REGD NO- F15152002039 BRANCH- ELECTRICAL ENGINEERING YEAR:- 2015-18 GOVT.  Types of static relays The rectified output is fed to the measuring unit. This type of relay provides two settings, on and off. It is of two types: instantaneous over current (IOC) relay and definite time overcurrent (DTOC) relay. A programmable protection and control system has a microprocessor or microcomputer in its circuit. Tata McGraw-Hill Education, 1989 - Electric power systems - 723 pages. Gravitational force can affect the relay. The output of Current Transformers or Potential Transformers or transducers is rectified in the rectifier. Memory 4. Time delay relay. introduced stringent testing requirements for static relays. 1. While EMRs are still widely used, they have several disadvantages in comparison to SSRs. This kind of relay switches on when an input voltage is applied and the load AC voltage crosses the next zero voltage. • Improved accuracy and selectivity. Your email address will not be published. Looks like you’ve clipped this slide to already. When the coil is de-energized, springs can move the contacts back to the OFF position. Position of relay: Relay can be installed at any location and at any position. Their design is based on the use of analogue electronic devices instead of coils and magnets to create the relay characteristic. Present generation relays. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Types of electromechanical relays Electromechanical relays that are common to commercial and industrial applications may be general-purpose, machine control, or reed relays. Static Relays. ; They have a longer lifespan than EMR relays. ... 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. Points Static Relays Electromagnetic Relays; Power consumption: Very less 1 milliwatt: High 2 watt: Moving contacts: No moving contacts. is connected to transmission line and secondary is connected to some filter circuit. Within built software with predefined values: They use microprocessor. Your email address will not be published. Electronic Relays 2. 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. Static relay. The primary of C.T. Present generation relays. The static network is so designed that it gives an output signal in the tripping direction whenever a threshold conditions reached. 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. A solid-state relay (SSR) is an electronic switching device that switches on or off when a small external voltage is applied across its control terminals. Input Module 2. 40 A Solid State Relay. 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. 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. Relays are classified into several types based on their functionality and application they are implemented for. The measuring unit comprises comparators, level detectors, filters, logic circuits. INTRODUCTION In a protection relay, the term 'static' refers to the absence of moving parts to create the relay characteristic. No public clipboards found for this slide, Student at National Institute of Technology , Patna. The amplified output is given to the output unit which energizes the trip coil only when the relay operates. 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. Electromagnetic attraction type Relays; Solenoid Type; Attracted Armature; Balanced Beam Type; Induction Type Relays. 2nd generation relays. 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 electronic relays more commonly known as static relays. Static Relay: The term ‘static relay’ is generally referred to a relay incorporating solid state components like transistors, diodes, resistors, capacitors, etc. 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. 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. One main difference between them is electromechanical relays have moving parts, whereas solid-state relays have no moving parts. Power System Protection: Static Relays. Thereby current flows in the trip circuit of the circuit-breaker. There are two basic classifications of relays – Electromechanical Relays and Solid State Relays (Static relay). Their design is based on the use of analogue electronic devices instead of coils and magnets to create the relay characteristic. The term ‘static’ implies that the relay has no … 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. The book is a thoroughly revised and updated second edition of a successful text. Introduction of static relays began in the early 1960’s. • Fast operation of relays and hence fast clearance of faults. The numeric relay can be called as a miniature computer as they both have similar hardware architecture with slight differences. Based on operation mechanism protection relay can be categorized as electromagnetic relay, static relay and mechanical relay. A solid state relay is composed of both static and electromechanical units in which the response is accomplished by the static units. 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. Working of Static Relay . 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. The book is a thoroughly revised and updated second edition of a successful text. Basic Relays - Electromagnetic Attraction and Induction Relays, 7 FE Electrical and Computer Practice Problems with Solutions, 2 Important Distribution Transformer Testing Methods. . ; It has no physical contacts. A protective system is formed by static relays and electromechanical auxiliary relays. Static relays are designed to get a response not from a mechanical operation but rather from an electrical, electromagnetic, or optical action. Transductor (Magnetic Amplifier Relays) 3. The polarized relay operates when S 1 >S 2 where S 1 =K 1 i 1 and S 2 = K 2 i 2. is rectified and measured. PROTECTION AND SWITCHGEAR Page 6 alone, reactance alone, or a combination of the two. New developments in commercial relay manufacture are also included. The output is initiated when the input reaches the threshold value. What is welding cable? Output module 6. 9.7.1 Type Tests. Facts Everyone Should Know About Trailer Wires. In this type of relay, the functions of comparison and measurement are performed by static circuits wherein … Electromagnetic relays 2. Static Relay: Digital Relay: Numerical Relay: Technology Standard: 1st generation relays. Types of protection relays are mainly based on their characteristic, logic, on actuating parameter and operation mechanism. : 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. Protective Relays 3. In static relays, the measurement is performed by electronic/magnetic/optical or other components without mechanical motion. Among them differential relay is very commonly used relay for protecting transformers and generators from localised faults. There are two basic classifications of relays - Electromechanical Relays and Solid State Relays. Both types of relay control electrical circuits through a switch that is open or closed depending upon an electrical input. 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. can be suitably converted into equivalent analog or digital signals and then fed to the static relay. 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. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. For a normally open output, the energized coil forces the armature to put the electrical contacts into the ON state. In electrical systems, a static relay is a type of relay, an electrically operated switch, that has no moving parts. 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 … Note: Solid-state relays (SSRs) fall into this category. Department of EEE Induction Disc Type; Induction Cup Type; Direction Type Relays Although there are different types of overcurrent relays but basic working principle of overcurrent relay is more or less same for all. All the Relays react to voltage or current with the end goal that they open or close the contacts or circuits. A static relay consists of electronic circuitry to emulate all those characteristics which are achieved by moving parts in an electro-magnetic relay. Earlier, for each of these functions, separate electromechanical or static units were used along with complex wiring. 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. The ANSI device number is 50 for an IOC relay or a DTOC relay. Such type of relay instantly switches on the load circuit whenever a sufficient input voltage is applied. Introduction of static relays began in the early 1960's. 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. 3. Advantages of static relays • Due to the amplification of energizing signals obtainable, the sources need only provide low power. CPU 3. 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. Early versions used discrete devices such as transistors and diodes in conjunction with resistors, Where to buy cheap cable for my welding plant? As a result, the moving element starts moving to change the contact position in the relay. 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. Operating Principle: They use principle of electromagnetic principle. See our Privacy Policy and User Agreement for details. Now we look at various types of relays which are more popularly used in many applications. 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. They can be broadly classified in to the following types. 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. Typically, an EMR needs 5 to 15 ms to switch and settle—a delay which is not acceptable in some … An electromechanical relay is robust and versatile. Universal torque equation, Distance relays: Impedance, Reactance and Mho and Off-Set Mho relay, Characteristics of Distance Relays and Comparison. Electromechanical relays that are common to commercial and industrial applications may be general-purpose, machine control, or reed relays. 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. The relays in this category are the inverse definite-minimum-time lag (IDMT) overcurrent and earth-fault relays. In my earlier post I have alreaady explained the working of relays… Proportional Control Solid-State Relays The most common types of proportional solid-state relays on the market today are phase-angle controllers and burst-fire relays. Arrangement of Bus bar, Circuit breaker and isolator. The major differences between the types of electromechanical relays are their intended use in the circuit, cost, and life expectancy of each device. 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. 3 Reviews. Kongunadunadu College of Engineering and Technology Depar tment of EEE. 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. each type of relay. 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. Digital input/Communication module Input Module The Power system operates with analog parameters. Time delay relays 2. Generally speaking, the term “impedance” can be applied to resistance . POLYTECHNIC MAYURBHANJ, TIKARPADA 2. Introduction of static relays began in the early 1960's. Static relays can be arranged to respond to electrical inputs. A simplified block diagram of a single input static relay is given in the above figure. This type works with voltage input signals derived from PTs. Solid State Relays We will discuss all of them in detail below.