Working of relay. 2 0 obj Technical Explanation for Solid-state Relays Introduction What Is a Solid State Relay? << These are operated to open or close the load contacts in response to one or more electrical quantities like voltage and current. /Height 16 Normal operation - It involves requirements for supplying the existing load and a certain amount of anticipated future load. endobj Based on operation mechanism protection relay can be categorized as electromagnetic relay, static relay and mechanical relay. 6 0 obj <>stream x��� ���H��dBP��m%�6 �q. 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. the relay to switch on or off automatically. In the drawing on the right, the mta is approximately 75 degrees. /Height 2471 /Width 16 2. 7 0 obj /Subtype /Image /Producer (�� w k h t m l t o p d f) /ColorSpace /DeviceGray [�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'�[email protected]��D`G�(dX�6�S�0��_9�t��3MOs����ڪ�\�녣e A relay comprises of an electromagnet and a contact unit. P. GOPALA KRISHNA ADE/400KV/APTRANSCO Power Systems Protection -Introduction Power Systems e7tip relay control test sel- 387a . %���� 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. Protective relay Wikipedia (PDF) Protective Relays Mohamed Mashooth Academia.edu. /ColorSpace /DeviceRGB /Height 2471 When we /Filter /FlateDecode a tree branch short-circuiting a power line) and then automatically re-close the breaker to test whether or not the fault has cleared. /Subtype /Image Some are called VOX (voice- operated) relays because they actuate when we speak into the microphone. Introduction to Relays. 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. Actually, a relay is nothing but a combination of one or more open or closed contacts. Types of protection relays are mainly based on their characteristic, logic, on actuating parameter and operation mechanism. endobj endobj Relays allow a small current >> 9 0 obj An introduction to Reed Relay basics (Part 1): Reed Relay Basics. << /SMask /None>> /BitsPerComponent 8 stream NO (Normally Open) and NC (Normally Closed). Simply put, It uses electromagnetism from small voltage to provide higher voltages. 3 0 obj stream /Type /XObject - A relay so designed that a bar actuates several contacts simultaneously. /ColorSpace /DeviceRGB /Width 16 A Solid State Relay (SSR) is a re lay that does not have a moving contact. /Filter /FlateDecode /Width 1971 stream 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. A Relay comprises of an electromagnet and a contact unit. Biased relay. /SA true /Type /XObject /Length 7 0 R 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. 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. /Type /XObject /ColorSpace /DeviceGray �;�%�����������Yg¸�����������&�����������Yj¸�����������6_�|�3Z��\53333333333j��K�7���a|o����G�'����/ �dr���ߎ��������OW������ �v~~����G+\J?zto2��&. 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. Relay accomplishes this with static queries and ahead-of-time code generation. <>/Contents 2 0 R >>endobj /BitsPerComponent 8 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. When input voltage is applied across its coil, NC changes to NO and NO changes to NC. View INTRODUCTION TO POWER SYSTEM PROTECTION & RELAYS PPT.pdf from EEE 56 at JNTU College of Engineering. FUNCTION OF PROTECTIVE RELAYING. Relay logic basically consists of relays wired up in a particular fashion to perform the desired switching operations. NC = Normally Closed, COM is connected to this when the relay coil is off. 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. October 2, 2014 By Anjali Sethiya . PROTECTIVE RELAYING. /Subtype /Image Abnormal Operation - Electrical equipment … NO = Normally Open, COM is connected to this when the relay coil is on. >> /Subtype /Image �l (P6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � ��[email protected]�� A� ��l HP6 $( � 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��[email protected]�� A� ��l H�� ����.��endstream 1 0 obj In the middle you see a cloud with an icon you probably haven’t seen before. endobj - Contacts which interrupt one circuit before /Length 15 0 R >> /Length 9 0 R x��[I�+�����:��ƪ���^d��!��]���{���H:�J���p�mWi8��Α�y����v1���_'���9�������?\~�/˿�����z�˫iI������?��.����f��:�X?�i? endobj PDF | On Apr 19, 2016, Vladimir Gurevich published Electric Relays: Principles and Applications | Find, read and cite all the research you need on ResearchGate 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. Relay is a very important device now days. how to /l//east//up i/o//aoe and : analog inputs 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. %PDF-1.4 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. The factors affecting the choice of protection are type and rating of equipment, location of the equipment, types of funks, abnormal /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) We know that most of the high end industrial application devices have relays for their effective working. Introduction to Relay. - 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. In terms of operation, SSRs are not very different fr om mechanical relays that have moving contacts. /BitsPerComponent 8 Every part of the power system is protected. ]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�! 28 x�k�� �[email protected]��q��4� ����endstream 'OF�c��a� �Og�x02|�9�5C�0�*�CqtjTU{���b�������*2 �p�R�Dv�k%6V�[��F:�i$��*���nɈI�6x��0:�6. This is a picture of frame relay and it works a bit different. RELAYING PRINCIPLES. stream They are used in various circuits and many of us have problem of how to use a relay. 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. 54 /Type /ExtGState 13 0 obj 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 … Introduction of static relays began in the early 1960’s. 8 0 obj << /ca 1.0 endobj Relay is an switch, which opens and closes the circuit electronically. 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. This icon is the frame relay switch. 12 0 obj protection shape) of distance relays is the mho characteristic, a circular type reach characteristic. endobj Relay technology. TYPES OF RELAY INTRODUCTION TO PROTECTIVE RELAYING WHAT IS PROTECTIVE RELAYING? 9629 Introduction to protective relaying 1.1 What is relaying? x���_d�#��P�(ъ�Z�WL!��P�~���T���!��ވO�� �^�Kendstream Part 1 Introduction. >> x����N�e���?�.4i�R��0A*+��i�456Ѹ� /SMask 6 0 R << INTRODUCTION TO PROTECTIVE RELAYING. >> /SMask 12 0 R Relays are /AIS false /Height 16 << This p roduces a retarding effect on motion of the rotor in either di rection. endobj 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. Their design is based on the use of analogue electronic devices instead of coils and magnets to create the relay … 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. /CA 1.0 Electric power is available to the user Electric energy is one of the fundamental resources of modern industrial society. 1. 4. 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. /Length 13 0 R UNIT I - INTRODUCTION OF RELAYS. 1 0 obj %PDF-1.4 See also: relay. /Filter /FlateDecode 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. endobj A DHCP relay agent is a host that forwards DHCP packets between clients and servers that do not reside on a shared physical subnet. relays. Protective Relays Introduction Protective Relaying is one of the several features of the power system design. It has two basic contacts i.e. (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 In a protection relay, the term ‘static’ refers to the absence of moving parts to create the relay characteristic. 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. SSRs, however, employ semiconductor switching elements, such as thyristors, 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 /Type /XObject << [/Pattern /DeviceRGB] 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� /Filter /FlateDecode /SM 0.02 Introduction to DHCP Relay. /Creator (��) 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. relay to provide magnetism in the zero current position. /BitsPerComponent 8 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. 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 . 4 0 obj 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. B3�y&3�?澮�~�������g�?23333333333+�pkmk��;KW����������� Break-before-make Contacts. The relay is an automatic protective and switching device which is capable of sensing abnormal conditions in electrical circuits. React allows views to be defined as components where every component is responsible for rendering a part … /Width 1971 14 0 obj Relays are used in a wide variety of applications like electric power systems, home appliances, automobiles, industrial equipments, digital computers, etc. A relay that functions to prevent overheating of the field excitation winding by reducing or interrupting the excitation of the shunt field. Relay agent forwarding is distinct from the normal forwarding of an IP router where … /CreationDate (D:20140305093158Z) Have moving contacts lay that does not have a moving contact the help of this I. At JNTU College of Engineering many of us have problem of how to use a relay comprises of IP! 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