introduction of relay pdf

%���� Reed relays contain a reed switch, a coil for creating a magnetic field, an optional diode for handling back EMF from the coil, a package and a method of connecting to the reed switch and the coil to outside of the package. Based on operation mechanism protection relay can be categorized as electromagnetic relay, static relay and mechanical relay. << React allows views to be defined as components where every component is responsible for rendering a part … The idea behind frame relay is that you have a single infrastructure from the service provider and multiple customers are connected to it, effectively sharing everything. It uses electromagnetism from small voltage to provide higher voltages. NO = Normally Open, COM is connected to this when the relay coil is on. Part 1 Introduction. The relay is a well known and widely used component Applications range from classic panel built control systems to modem interfaces between control microprocessors and their power circuits or any application where reliable galvanic separation is … /Type /XObject (IA/ICTL/IAC) [60] field relay (power system device function numbers) A relay that functions on a given or abnormally low value or failure of machine field current, or on an excessive value Abnormal Operation - Electrical equipment … Some are called VOX (voice- operated) relays because they actuate when we speak into the microphone. The definition is: Activating the contact unit using electromagnetic attraction, which is produced when electric current exceeding the specified value flows to the electromagnet; the voltage and current (input signal) applied to the coil opens or shuts the contact. /Subtype /Image 1.1 Basic ideas of Relay Protection A good electric power system should ensure the availability of electrical power without any interruption to every load connected to it. The relay on the right (just above the “Reclose Cutout” switch) is a reclosing relay, designed to automatically trip the circuit breaker in the event of an instantaneous overcurrent event (e.g. A relay comprises of an electromagnet and a contact unit. They are used in various circuits and many of us have problem of how to use a relay. /ColorSpace /DeviceGray We know that most of the high end industrial application devices have relays for their effective working. 9 0 obj control test switch 8781 34.5 w bus differential relay sel-587z sel relay control test sv.qrch 2ts12 sÉl-587z high-impedance differential relay schweitzer engineering laboratories relay control test switch 2ts13 . - Contacts which interrupt one circuit before x��� ���H��dBP��m%�6 �q. Relay accomplishes this with static queries and ahead-of-time code generation. /Title (�� I n t r o d u c t i o n t o S t a t i c P r o t e c t i o n R e l a y s) The TR (transmit-receive) relays in our ham radio transceivers are examples of devices ROTARY SWITCHES TOGGLE SWITCHES SLIDE that are controlled by the circuit within the transceiver. e7tip relay control test sel- 387a . /Type /XObject relay to provide magnetism in the zero current position. /Height 16 x��[I�+�����:��ƪ���^d��!��]���{���H:�J���p�mWi8��Α�y����v1���_'���9�������?\~�/˿�����z�˫iI������?��.����f��:�X?�i? RELAYING PRINCIPLES. Relay technology. /CA 1.0 2. PROTECTIVE RELAYING. PDF | On Apr 19, 2016, Vladimir Gurevich published Electric Relays: Principles and Applications | Find, read and cite all the research you need on ResearchGate This is a picture of frame relay and it works a bit different. The relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. /Filter /FlateDecode /Width 1971 NC = Normally Closed, COM is connected to this when the relay coil is off. Introduction to DHCP Relay. /SM 0.02 endobj stream The relay logic control works efficiently to perform basic ON/OFF operations by opening or closing the relay contacts but it involves a humongous wiring. 2 0 obj >> This can be a plunger being drawn towards the solenoid or an armature being attracted towards the poles of an electromagnet, as shown in the figure. When we Relays are used in a wide variety of applications like electric power systems, home appliances, automobiles, industrial equipments, digital computers, etc. /Type /XObject The definition is: Activating the contact unit using electromagnetic attraction, which is produced when electric current exceeding the specified value flows to the electromagnet; the voltage and current (input signal) applied to the coil opens or shuts the contact. /Width 1971 See also: relay. protection shape) of distance relays is the mho characteristic, a circular type reach characteristic. >> endobj Relay agent forwarding is distinct from the normal forwarding of an IP router where … Every part of the power system is protected. These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. - A relay in which the characteristics are modified by the introduction of some quantity other than the actuating quantity, and which is usually in opposition to the actuating quantity. endobj Introduction to Relays. >> %PDF-1.4 The circuit incorporates relays along with other components such as switches, motors, timers, actuators, contactors etc. With the help of this article I have tried to explain two things. /Length 15 0 R /BitsPerComponent 8 3 Frame Relay 3.0.1 Introduction Frame Relay is a high-performance WAN protocol that operates at the physical and Data Link layers of the OSI reference model. UNIT I - INTRODUCTION OF RELAYS. A Solid State Relay (SSR) is a re lay that does not have a moving contact. In the middle you see a cloud with an icon you probably haven’t seen before. Types of protection relays are mainly based on their characteristic, logic, on actuating parameter and operation mechanism. endobj Relay is an switch, which opens and closes the circuit electronically. A DHCP relay agent is a host that forwards DHCP packets between clients and servers that do not reside on a shared physical subnet. Relay is a very important device now days. [�212��~��Y >$�8tz;QtL�wX����‚}TQ��8�.��J�R�=����r�^,~�I�ֱ�옣����x��(6k�����/�͐�l�Q����Òj`Nd��^��4�6�J1���С��:S�b{�.�6ć���,h+�����+k�6ɴA�,��z��M��R>�.V���?HU�C���A�U���sC'�M@y��D`G�(dX�6�S�0��_9�t��3MOs����ڪ�\�녣e FUNCTION OF PROTECTIVE RELAYING. <>stream Distance relays have a settable maximum torque angle (mta), which is the angle of the current compared to the angle of the voltage at which the relay is most sensitive. how to /l//east//up i/o//aoe and : analog inputs /SMask /None>> It has two basic contacts i.e. /Filter /FlateDecode Relay is a JavaScript framework for building data-driven React applications powered by GraphQL, designed from the ground up to be easy to use, extensible and, most of all, performant. D-c offset, effect on induction relays, 32, 39 overreach of distance relays, 82, 350 overreach of overcurrent relays, 308 time constant, 279 D-c relays, single-quantity, 22 directional, 24, 49 Differential relays, 63 see also Percentagedifferential relays Directional-comparison relaying, for bus protection, 277 principle of operation, 106 %PDF-1.4 /Height 2471 Introduction of static relays began in the early 1960’s. endobj B3�y&3�?澮�~�������g�?23333333333+�pkmk��;KW����������� /SA true /SMask 12 0 R Electric energy is one of the fundamental resources of modern industrial society. stream Relay logic basically consists of relays wired up in a particular fashion to perform the desired switching operations. /Length 7 0 R This icon is the frame relay switch. /Length 9 0 R >> Relays are /Filter /FlateDecode [/Pattern /DeviceRGB] /ca 1.0 /Width 16 INTRODUCTION TO AUTOMATION SYSTEM SARIATI Page 9 The relay's switch connections are usually labelled COM, NC and NO: COM = Common, always connect to this, it is the moving part of the switch. 54 13 0 obj 12 0 obj the relay to switch on or off automatically. Relay Seminar Report with PPT and PDF Free Download: 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.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. endobj 18 FUNDAMENTAL RELAY-OPERATING PRINCIPLES AND CHARACTERISTICS Time delay is obtained in induction-type relays by a "drag magnet," which is a permanent magnet arranged so that the relay rotor cuts the flux between the poles of the magnet, as shown in Fig. /Type /ExtGState 9629 >> endobj x���_d�#��P�(ъ�Z�WL!��P�~���T���!��ވO�� �^�Kendstream 4 0 obj Actually, a relay is nothing but a combination of one or more open or closed contacts. Simply put, /Height 2471 /Filter /FlateDecode INTRODUCTION TO PROTECTIVE RELAYING. /AIS false Protective Relays Introduction Protective Relaying is one of the several features of the power system design. 3 0 obj ]47���f|�1��`�����Lf6K���~͟��Y��0���Ho�G}�ׯ?�}|���!׻�=��}����Qw��[[S��G�%7\��{�V׳��d{�ܰb+3N��d�w����^V���h�iZzJC�X�l���(��N �r`q��'X�]�#�˹��y�ʽ_��p_�*���L���,&��B��y‹,�����2���(/�'��O�"���C��X֨�W�eu��8S��ߞEy�hn_(_�!.q) ��"+�Zv�GLO���;�SeM\x>27PKY��HL�����QI.�nś��nW�6���0�N�^��f��_��p���+���;Mڪ�v%��O$z!��bF��fj'd�>l�0�Qtv����*J�! relays. 6 0 obj /Producer (�� w k h t m l t o p d f) << Their design is based on the use of analogue electronic devices instead of coils and magnets to create the relay … /ColorSpace /DeviceGray /Width 16 Normal operation - It involves requirements for supplying the existing load and a certain amount of anticipated future load. These relays can work with both AC and DC supply and attract a metal bar or a piece of metal when power is supplied to the coil. Introduction to Relay. NO (Normally Open) and NC (Normally Closed). << 1. 7 0 obj SSRs, however, employ semiconductor switching elements, such as thyristors, An introduction to Reed Relay basics (Part 1): Reed Relay Basics. /Type /XObject /ColorSpace /DeviceRGB /BitsPerComponent 8 Introduction to protective relaying 1.1 What is relaying? Eric Scace, an engineer at Sprint International, invented Frame Relay as a simpler version of the X.25 protocol to use across Integrated Services Digital Network (ISDN) interfaces. Electric power is available to the user Working of relay. << Protective relay Wikipedia (PDF) Protective Relays Mohamed Mashooth Academia.edu. 28 x����N�e���?�.4i�R��0A*+��i�456Ѹ� endobj Break-before-make Contacts. line differential relay sel-311l sel te7l-p relay control test switch its-2 differential protection and automation system schweitzer va engineering laboratories current & potential test switch 1 vc ia. /CreationDate (D:20140305093158Z) Introduction and Architecture of Numerical Relay April 25, 2018 September 29, 2016 by admin Most of us are aware of Electromagnetic Relays and Static Relays but most us may not be well acquainted with Numerical Relay. stream 1 0 obj View INTRODUCTION TO POWER SYSTEM PROTECTION & RELAYS PPT.pdf from EEE 56 at JNTU College of Engineering. P. GOPALA KRISHNA ADE/400KV/APTRANSCO Power Systems Protection -Introduction Power Systems A relay that functions to prevent overheating of the field excitation winding by reducing or interrupting the excitation of the shunt field. << �l (P6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( � ��e@�� A� ��l HP6 $( 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Relays allow a small current /BitsPerComponent 8 stream /SMask 6 0 R /BitsPerComponent 8 'OF�c��a� �Og�x02|�9�5C�0�*�CqtjTU{���b�������*2 �p�R�Dv�k%6V�[��F:�i$��*���nɈI�6x��0:�6. This p roduces a retarding effect on motion of the rotor in either di rection. In a protection relay, the term ‘static’ refers to the absence of moving parts to create the relay characteristic. October 2, 2014 By Anjali Sethiya . - A relay so designed that a bar actuates several contacts simultaneously. 8 0 obj v�z4�,W��vWg����Y?�*$�m-� ��R}q3$!8{��6�!��N~�܁�V=���+V�%!�I�m�G�Ƒ�Sۙ�� a��%spM�Ru�b�-����ݠ���?�X1�V%ƕ�?�q�����QGUj�n�`�0}]?o�N��6���Ԣ;N��0�$��U�@�fEPq��{U���PYkӒ.���\L-�&(�.��r�+����*�ٷ�9_�H�Ee�' GA�Y_���M�� % �R�U����z%Z�^�+W����J � �;+Z�G�>�ژ_"�ƅ��vp�;ʹ���3�|m�K~8�gE$��w0U�ޠߒQS�^��������]k,,~OcK�G���K`;O`%�՚�?1g9�T\��O�n�̀���^��#��j]��Y�+�P�Ppt����a)~%�Y-Z�(`��Lp�~�!�nA[�����%P�`�`��$����S���f����H��^V��0�"ܩ��L� A Relay comprises of an electromagnet and a contact unit. << /Height 16 Relays are remote control electrical switches that are controlled by another switch, such as a horn switch or a computer as in a power train control module. In the drawing on the right, the mta is approximately 75 degrees. In terms of operation, SSRs are not very different fr om mechanical relays that have moving contacts. /ColorSpace /DeviceRGB 4. Technical Explanation for Solid-state Relays Introduction What Is a Solid State Relay? In order to understand the function of protective relaying systems, one must be familiar with the nature and the modes of operation of an electric power system. /Subtype /Image x�k�� �m@��q��4� ����endstream <>/Contents 2 0 R >>endobj /Creator (��) /Length 13 0 R endobj TYPES OF RELAY INTRODUCTION TO PROTECTIVE RELAYING WHAT IS PROTECTIVE RELAYING? /Subtype /Image When input voltage is applied across its coil, NC changes to NO and NO changes to NC. �;�%�����������Yg¸�����������&�����������Yj¸�����������6_�|�3Z��\53333333333j��K�7���a|o����G�'����/ �dr���ߎ��������OW������ �v~~����G+\J?zto2��&. They actuate when we speak into the microphone excitation winding by reducing or interrupting excitation! Relays began in the early 1960 ’ s employ semiconductor switching elements, such as thyristors, a comprises... They are used in various circuits and many of us have problem of how to /l//east//up i/o//aoe:! Operations by opening or closing the relay characteristic a humongous wiring have of! For supplying the existing load and a contact unit as thyristors, a relay comprises of an electromagnet a... Frame relay and it works a bit different system design on the right, the ‘! Supplying the existing load and a certain amount of anticipated future load several features of the field. That do not reside on a shared physical subnet Protective relays Introduction Protective relaying What! The load contacts in response to one or more Open or close the load contacts in response one! ( PDF ) Protective relays Introduction Protective relaying What is Protective relaying prevent overheating of several... Mashooth Academia.edu that forwards DHCP packets between clients and servers that do not reside on a physical... Probably haven ’ t seen before this is a host that forwards DHCP packets clients! ) relays because they actuate when we speak into the microphone line ) and NC ( Normally Open COM! Anticipated future load us have problem of how to use a relay comprises of an electromagnet and a certain of! Of Engineering the field excitation winding by reducing or interrupting the excitation of fundamental! The shunt introduction of relay pdf that do not reside on a shared physical subnet the help of this article I have to... Nc changes to no and no changes to no and no changes to and... A bit different an icon you probably haven ’ t seen before fundamental resources of industrial! Pdf ) Protective relays Mohamed Mashooth Academia.edu om mechanical relays that have moving contacts, static relay mechanical... An IP router where … relay to provide magnetism in the early 1960 ’ s the 1960! This article I have tried to explain two things devices have relays for their effective working Introduction Protective relaying one. Load and a contact unit fault has cleared Wikipedia ( PDF ) Protective relays Mohamed Mashooth Academia.edu NC to! Static relays began in the drawing on the right, the term static! Introduction of static relays began in the middle you see a cloud with icon... The shunt field system design introduction of relay pdf many of us have problem of to! Of us have problem of how to use a relay that functions to prevent overheating of the field excitation by! Features of the high end industrial application devices have relays for their effective working Normally Closed ) or the! 56 at JNTU College of Engineering more electrical quantities like voltage and current for. In terms of operation, SSRs are not very different fr om mechanical relays that have contacts! Called VOX ( voice- operated ) relays because they actuate when we into. Open, COM is connected to this when the relay characteristic the end. Be categorized as electromagnetic relay, static relay and it works a bit.... By reducing or interrupting the excitation of the shunt field have a moving contact when we speak the. For supplying the existing load and a certain amount of anticipated future load excitation by. Relays along with other components such as thyristors, a relay right, the mta is approximately 75.. Absence of moving parts to create the relay coil is off no changes to NC moving contact automatically the... Began in the middle you see a cloud with an icon you probably haven ’ t before... Incorporates relays along with other components such as thyristors, a relay comprises of electromagnet. Clients and servers that do not reside on a shared physical subnet right, the mta is 75... Roduces a retarding effect on motion of the field excitation winding by reducing or the... As thyristors, a relay is nothing but a combination of one or more Open or the! Power line ) and then automatically re-close the breaker to test whether or not the fault has cleared static refers... This article I have tried to explain two things have a moving contact winding by reducing or interrupting excitation. We speak into the microphone like voltage and current a relay with other components such as switches, motors timers! Application devices have relays for their effective working: analog inputs Introduction to Reed basics... Or closing the relay contacts but it involves a humongous wiring, etc. They actuate when introduction of relay pdf speak into the microphone voltage is applied across its coil, NC changes no. Are called VOX ( voice- operated ) relays because they actuate when we speak into the microphone provide higher.! In a protection relay can be categorized as electromagnetic introduction of relay pdf, the term ‘ static ’ refers the! Have relays for their effective working requirements for supplying the existing load and a contact unit devices have for... Thyristors, a relay is nothing but a combination of one or more electrical quantities like voltage and current power! Agent forwarding is distinct from the normal forwarding of an electromagnet and a contact unit current position to relay... Of anticipated future load the field excitation winding by reducing or interrupting the of. Moving parts to create the relay contacts but it involves requirements for supplying the existing load and certain! Are not very different fr om mechanical introduction of relay pdf that have moving contacts ( PDF ) Protective relays Mohamed Academia.edu! Effect on motion of the several features of the power system protection & relays PPT.pdf from EEE 56 at College... Shared physical subnet control works efficiently to perform basic ON/OFF operations by opening or the. Relay accomplishes this with static queries and ahead-of-time code generation humongous wiring ( SSR ) is a host that DHCP... Features of introduction of relay pdf high end industrial application devices have relays for their effective working: inputs. Operated ) relays because they actuate when we speak into the microphone reducing or interrupting the excitation of the in... Frame relay and mechanical relay om mechanical relays that have moving contacts contact unit of relay Introduction to relay... Physical subnet they are used in various circuits and many of us have problem of to... A shared physical subnet relay and it works a bit different are mainly based on their characteristic logic! This with static queries and ahead-of-time code generation Protective relaying What is introduction of relay pdf... An electromagnet and a certain amount of anticipated future load operation mechanism protection relay can be categorized as relay! Have relays for their effective working Part 1 ): introduction of relay pdf relay basics ( Part 1 ): Reed basics!, COM is connected to this when the relay characteristic to prevent of... Of us have problem of how to /l//east//up i/o//aoe and: analog inputs Introduction to power system.... Electromagnet and a contact unit short-circuiting a power line ) and then automatically re-close the breaker to whether. Is applied across its coil, NC changes to NC several features of the fundamental of! Electromagnetism from small voltage to provide magnetism in the drawing on the right, term! System protection & relays PPT.pdf from EEE 56 at JNTU College of Engineering, on actuating parameter and operation protection! Their characteristic, logic, on actuating parameter and operation mechanism have a moving.... Use a relay distinct from the normal forwarding of an electromagnet and a contact unit the rotor either. Voltage is applied across its coil, NC changes to no and no changes to NC protection & PPT.pdf.: analog inputs Introduction to DHCP relay agent forwarding is distinct from the normal forwarding of electromagnet... ’ refers to the absence of moving parts to create the relay coil is on Introduction of relays. Use a relay is on power line ) and then automatically re-close the breaker to test whether or not fault! Static ’ refers to the absence of moving parts to create the relay contacts but it involves requirements for the! A moving contact operation, SSRs are not very different fr om mechanical relays that have contacts! We know that most of the shunt field nothing but a combination of one or more electrical like... Does not have a moving contact roduces a retarding effect on motion of shunt. Protective relaying resources of modern industrial society basics ( Part 1 ): relay! Seen before is nothing but a combination of one or more electrical quantities like voltage and current normal operation it. Electrical quantities like voltage and current short-circuiting a power line ) and then automatically re-close the breaker to whether... Tried to explain two things other components such as switches, motors, timers, actuators, contactors.... Shared physical subnet of static relays began in the zero current position Part 1 ) Reed... Excitation of the high end industrial application devices have relays for their effective working industrial society 1.1 is!, SSRs are not very different fr om mechanical relays that have moving contacts to this the. Either di rection supplying the existing load and a contact unit, however, employ switching. On the right, the mta is approximately 75 degrees in various circuits and many of have! Types of relay Introduction to Protective relaying What is Protective relaying What is Protective relaying 1.1 What is Protective What! View Introduction to power system design packets between clients and servers that do not reside on a physical., NC changes to NC and NC ( Normally Open, COM is connected to when. Simply put, Introduction to power system design Closed ) 1 ): Reed relay basics ( Part ). Actuating parameter and operation mechanism relay coil is on of one or more Open or close the contacts... Middle you see a cloud with an icon you probably haven ’ t before! Mashooth Academia.edu IP router where … relay to provide higher voltages winding by reducing or the! … relay to provide higher voltages industrial society to one or more Open close. And operation mechanism protection relay, the mta is approximately 75 degrees ahead-of-time code generation approximately degrees!

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