overcurrent protection pdf
pdf. Academia.edu is a platform for academics to share research papers. Power system Protection Part – 5 Dr.Prof. Overcurrent The term “overcurrent” refers to abnormal current flow higher than the normal value of current flow in an electrical circuit. Module-4 Overcurrent Protection. The branch-circuit overcurrent protection device must be sized not less than 125% of 53 amperes, So, branch-circuit overcurrent protection device size = 53 amperes x 125% = 66 amperes. Two fundamental requirements of protection are as follows: 1. Figure 13: block diagram for 3-phase system using definite time overcurrent protection. 8�3����!"��Ҡܹ�? =۽"UDr۾�H�kj�%��G��Q/��͛�1��AO�v=����~+�6CߞHK�ëH��"h�D)���I��� Overcurrent protection is protection against excessive currents or current beyond the acceptable current rating of equipment. Let's get started! ���,MP�Jݟ�v�C7�� MH�Q�yc���|$�4�:�)MEF3*���C6�֭���i�a�@�����x��_���7n�������f�8 �I �$����:W��w�w��������ng�[W7���iكE�i�*7i��n��nhnZ�yW�WP5�_}�N6dE���I�k�HF4�$�G��샮���O���TJ,YB܇�%�CAV���*G�=vV�mW7���a��%���ɢ_�=�n��v}���J;�-o=�l���Iѐ"��Q&%G��,cmX]+ startxref The general requirement for overcurrent protection of conductors is provided in Section 240.4, Protection of Conductors. This scheme is based on the intuition that, faults typically short circuits, lead to currents much above the load current. 0000000696 00000 n ],�Xt��b�Ţ�E�>�6�o�� Kk�,#�&�m,0 h�} The relay operates as soon as the current gets higher than a preset value. of Overcurrent Protection from the mid-1960s until his passing in 2015. Back up protection should act if and only if primary protection has failed. �~�����zc{_�>�q�JЎO�U:uS*�B$J�E�u8eX_������O���|���}���D�����t�Z���z��C"�n2�����1��;`��cr?��7��bZ>�zA'��ܺ�;v���pv3��[�6���>s�[1���g����r���W��u�/��>}. Circuits can be designed to meet many of the automotive, military, and avionic standards including ISO 7637-2, x�b```c``�``a`sf�g@ ~�+sl```ԒY!�� T&p)�m&M��]����� i@IF Vd�20�FiA k�a�e\!�� #P������홾>/��'7���Z�����H3�5X3c�U��@| � �� 0000020534 00000 n Over-current protection, OCP for short, is simply a catch-all phrase for the proper implementation of fuses and circuit breakers. Abstract – Directional overcurrent relaying (67) refers to relaying that can use the phase relationship of voltage and current to determine direction to a fault. [5��!�j&�qn�dԲ��|�(f��,�R"�pM!���.�l��z����F�d�sj��@��L�A���[Z4(�J�ƚZiU0 There is no intentional time delay set. We can call them as overcurrents. Overcurrent relays are widely used for the protection of transmission and distribution networks [3]. The basic rule for overcurrent protection of conductors—other than using flexible cords, flexible cables, and fixture wires—is to protect the conductor in accordance with the ampacities specified in Section 310.15. 0000002226 00000 n This provides selectivity. STANDARD IDMT OVERCURRENT PROTECTION RELAYS. And connect so that the overcurrent relay trips circuit breaker 1. hXmo�8�+�^ѻd`����[�k�lk7���q�3$���đ�\����$K�$>�CYƙ�LH��cR+&���L�{��R[�K&=7L;��L{��͘���N>c:��e��8{�zp�/��yU�g�g�'w���%�=��:�Ϧ��b�XTӼ���������z�O����rZTuY?���=}��� ���d��*�S���1�^�/Gm������jVGhֻ4��|���=�(fu���z;�`�e1]+�\V�jY����bY���/��4%.sQ����i�ʛB؍�������@Ѵ���* g����R�ʆ��� ��#ԭM��Z�_�W���:� 3I)����.�����[��?�ON�rV:�7��n Overcurrent protection is a selective type of overload and short circuit protection, used mainly in radial networks with single ended feeders found in medium voltage systems. Experiment no. It generally operates instantly. Overcurrent protection devices. Leave a comment on this post, we will send you the Overcurrent Fundamental. As shown in Figure 5, the electrical power distribution system within … %%EOF 3h�c�G;����RL�ё "��N���[�v��aR�|:cR �=�kX9�7�: *qr�JPy?���.̟r6����x���a�Y��p m��a!��������ȸ�8&�IbR�4&tQ��E��B�. endstream endobj 29 0 obj<> endobj 30 0 obj<> endobj 31 0 obj<>stream 162 0 obj <>stream The current/time-tripping characteristics of IDMT protection relays may need to be changed according to the functioning time needed and the characteristics of other relay protection elements used in the electrical network0.10 For these needs, IEC 60255 determined … h�t��k�0���{ԧ��M"�ك�Һ��=����&��U��$��&�@��L �"���pf0��.\�y&\o&�R��X�C��d��oN�^z�E�X��'��>Mɥ�l�_'ƇJ�yC��G5*g�V�v�ç#pG$�S�=�cT1�+��є���J�����pHIj�vp��2�N�`�{Lз(���$�b�����1���W�6��,65�w���#��H|? ]4�ht�1}.�y��9pi�y*.�����Տ����:}��?�����1�AhBc��D� z�3��A�. overcurrent protection on all control circuit transformers. Overcurrent Protection Time-Current Characteristics—Application—Limits of Error—Ratings—Directional Overcurrent Protection—a.c. View Lab Report - Exp 5- Overcurrent Protection of Transmission Line.pdf from ELECTRICAL EE24569 at Princess Sumaya University for Technology. Overcurrent Protection H��W�r�F}�W�#�5!�T�C����Ȏ�̓���q� Њ�k�� E&��u�" ����>�}�#�$ǧ$(���F�'��;5����~!��9{u��ΉBO�!%��EaLa�RxY��;�#D��H$��?�{"�2_��'3�5�b)�RQ;g����y��ܼ"����0$�za&����KA�w����b�IJ"K��5��;s��}��(|��Ń�^~Q�b�٨���Y����M۫�/�(:W_�Bu��G���^��5��H�M$|zK�|Z:i䥌*�xS;�!w�+�)�,�yQ�W�'�se�Y��e��K�$�H�@$�F��nI��bm�9t�&���=a0,�@��l��)�8��O�y2I���G�s��ӱd��_��2�b��,A�݅���W����\xQ�ńO���Q:�k�ö̽4����������5M�� F� ��'�$9 8x�C�>/�K/H�dd�|����������K����q�[���� �C7L���z�6���Ul֍��p�6@+EC���,��ͫ���������Njb�k'��Zлj��w�kǰ��43�G �P糀s�H���k�[�o�moS��itǛvؑ[� �0L�!����������eP���`w�~vM�ҸuQ��e��a�[� 0000003084 00000 n �*'�n�vC:�6/�� Lecture -14 Fuse Protection; Lecture -15 Fundamentals of Overcurrent Protection; Lecture -16 PSM Setting and Phase Relay Coordination (Tutorial) Lecture -17 Earth Fault Protection using Overcurrent Relays; Module-5 Directional Overcurrent Protection. The relay located furthest from the source, operates for a low current value. As the over current elements are built as separate units, we may implement the over-current protection principles using: a) a combination of instantaneous and definite-time elements . 2. a��~��'�0#��b���z*�mg`s �'0v��yj�W�w,��2�~�P"��XQ��RW�����M:����QӒ�, �v�Ѷ�@}Zk�c����,ms����%4�jת�-��J���>,/�w'��������_�������-Dž;�������"H�R5���o�`=T�#b�ռP����lLʥ��k��j�3��Ae]V�����*���N�®�A�hРI��� 0�`�O�0(��f��P? �� Information on the available fault duties is important when performing a protection coordination study. 0000005910 00000 n 0000006233 00000 n Leave a comment on this post, we will send you the Overcurrent Fundamental. 0000003008 00000 n Dominik Pieniazek, P.E. This article describes the overcurrent protection principles, devices used in … 0000001139 00000 n When current exceeds Protecting circuits and equipment from overcurrent from overcurrent involves more than simply selecting a fuse or breaker from a table Art. Put the load to the maximum resistance 3. This relay is referred as definite (instantaneous) overcurrent relay. �q�G���[����r�"�$�:$^��������zi�������k�)4���,\�v祧r����]�D,�D����c鳫#sc|�d�fƖ�2)�>h��ە�`�%����_ ��} STANDARD IDMT OVERCURRENT PROTECTION RELAYS. ���` �`�� That means the circuit can act as an overcurrent or short circuit protection. Depending on the time of operation the overcurrent relay is categorized into following types. DIY Short Circuit (Overcurrent) Protection: In this project I will show you how to create a simple circuit that can interrupt the current flow to a load when the adjusted current limit is reached. It protects the equipment of the power system from the fault current. �5�>��=�h�4ʪ�5�ٹ3@N�^m�K�T��,����h˭*���t�ls�Zޫ%� N�z��c&�y��˧r� ��ԍHDd�4�� �E��e3�b�2�n����}��� The overcurrent limits are as follows: • Primary 9 Amps or more: no more than 125% of rated current Overcurrent Types and Effects An overcurrent is any current that exceeds the ampere %PDF-1.4 %���� Put the switch 1 and 3 off and switch 2 off. Connect the circuit shown in Figure 13. endstream endobj 164 0 obj <>stream The type of overcurrent protection system used and the maximum current passing through the circuit components determine the size of the overcurrent protection system. PDF Version. �j���8\�5�椵wJ�JJڭ�������x�����%�Ja8z��h/PD����0���ȫ�x�A=�C�©�Gj@ ob E6!x�η���a���=�Qp�����8&��8,o�ͻ��l��ֆNVDӖݬf���'��;Pk-Z�t\]#Ժ�;�X~�yv{����� �x���e�MjӁ��?c�f;4����%���v�d18Z%�%��#���������S���!�*����8�M�ܬ�r�Tй�N���i%�)����r||")c갏�anO`3B��j2G�Lb�,0�@>1�x�@3�92�����&!��� _�}�3K�J�B� �hA�|CO�f�Ў��,dJ|:�Xl7P�c�ZA��p�1�5���B~��Q^��x�2�!�8�y� +�Ŵ�c�]MN'��f�?��!DJ7"�r���p00��_;K3�7�H$M=z,aЦ@��h� 0000000016 00000 n trailer Figure 1 shows the single line diagram of the radial network. ������g��a{8����(6hj���#n�(��u_�zN6�t�K�@��8*���LP����9\*y��Y^A��z.B{��Оn��"�jE%�jM�@=�T��q�}W͜_�i^����K��������� endstream endobj 163 0 obj <>stream 38 0 obj<>stream EA��i2�Y��K��?�]��O��u�V `d�q���m���`]A~*!�5n���0PzK�jj�T`m|W�봉f�MGg��a���\*� Hence, it is intentionally slow. �{� �9�pp&��0�j�! Short circuit is a type of overcurrent. Before addressing those requirements, let's review the basic concept of overcurrent protection. Over current relaying and fuse protection uses the principle that when the current exceeds a predetermined value, it indicates presence of a fault (short circuit). 0000005458 00000 n The overcurrent relay is defined as the relay, which operates only when the value of the current is greater than the relay setting time. 0000000930 00000 n 1. Overcurrent protection is a basic approach to protect power system equipment from current levels that are beyond the design limits of equipment due to either an overload or a short circuit. :������jG#2�~Ӹl.�}�A�V3w���զ3 t�Łw���@ۧ�2IB�Ȫ�_)��*o��փ�z`E��N��-zK�"���%�PI���$���5E[E��#���, xK�st��I����q��-�U�5�,;�ʊ���3�n�ށߤ>o�umE�4n�H�� }��m;9V%Ӻ�B�ݗ���;5�!�ݨ��ib��s�D/�Ai��]=Q �$ޚ"\����o�:ţ��7��T�O 29��?��k' a��[,�ڧ�8u���mۯ��8&��6�`��1�S�ryev�r]cH�1�;��\�.۶�O�#2'��s����C�B�+���y-'�ӓqd������#�YCq�ˀHL�~�Q�n��#Q&Z����MwB��n�A`�C�,�p搋0D�u���U�T�c��n���{u�)q�2������8`�i�b��Ÿ �?ގ�_Ӊ�~�u�*��D�SO��옚=�W�E|�YA���OͰ ��;�GG���^c��Y�}99�F�_�Q��~��t8t���)�?f� X�݊7�K_?���ʖ1j2�.��'�j�~L �y�q���&��F�7�������F����^Inf���8�U�z�I�i��+��}��W��\ٕ�nI�n:��_�^M�NΝ�e~3B���"Uy]+�&�loJ?��f��Tu�u�/�6(������먉�4���Ef:�˛+�̻@��y�����--۸����ǽ9Lv�cǶl�[�������o��nԗ23e� �QK��xU����h���^��+����۶�{�e��c�J���A:P�����$Qb\]�eh�O�8:(L-h�:lj�ƞA{�+����m�~���)��v�^aH�,���^,��Dړ�+Υ�@�1 ��8K�5a��r)j���u�;��!�-��K" Mohammed Tawfeeq 011 Power system protection Dr.Mohammed Tawfeeq Overcurrent Protective Relays Overcurrent relays Overcurrent relaying is the simplest and cheapest type of protection used for protection of … Magnetic circuit breakers, fuses and overcurrent relays are commonly used to provide overcurrent protection. However, these traditional methods do not always meet the design criteria; The following table shows a summary of fault duties and how they are used. ux��7!�w4��>B�)1^����-� &�]!5b�i,M�h㮅��T���. 19 0 obj <> endobj Open the HTL software. Transmission Line Protection Directional Overcurrent Protection Relay responds to overcurrent condition in the forward direction only (device #67, 67N, 67NT) Will not respond to reverse faults Compares the current in the line versus a known reference that will always be the same (such as a … 0000017975 00000 n 19 20 0000001010 00000 n The relay setting is adjusted based on its location in the network. endstream endobj 20 0 obj<> endobj 21 0 obj<> endobj 22 0 obj<>/Font<>/ProcSet[/PDF/Text/ImageB]/ExtGState<>>> endobj 23 0 obj<> endobj 24 0 obj<> endobj 25 0 obj<> endobj 26 0 obj<> endobj 27 0 obj<> endobj 28 0 obj<>stream 0000002527 00000 n There are two options for overcurrent protection: Option 1 (Primary only Protection) Provide an overcurrent device in the primary circuit rated to the current of the transformer. The use of overcurrent protection (OCP) is a common practice in designing electrical circuits, and several common methods currently exist, such as; circuit breakers, fuses, and ground fault circuit interrupts. xref Overcurrent Protection - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. �"�����QN$�u����6|Fk*ɑ"�R(x��]�#�wd��ϨAD�, �Ds��E� ^o�_'̋{��Օ������ #�%-�ċ�,�#� %PDF-1.6 %���� In the feeder with small impedance, disting… 2.3 Mixed Curves Over-Current Relays Mixed curves have all the advantages of the different types of over-current relays. As a licensed professional engineer, he presented seminars on electrical overcurrent protection for more than 40 years. H��WmK\G�)���]-bR�m�X����%l� mh��5��?h��$�B� A�h��&��MR,f �f��mwg�9s�ݽsW恼�9ϼ�g�9s��!�Lp�[Hx��B�M++ + + BV�k�����I����w�H)KaU�E����`ӏn:J&e����@ͻ�n��;^ð��H)��?L�b���bD��YNXY���%D�j�&Pm� j�(/a4�k͕�yQ�ڒ�e����Hm��Pp�~g��N�Q�D�����e�l. 0000010267 00000 n Overcurrent Protection & Coordination for Industrial Applications Doug Durand, P.E. Overcurrent protection is designed to protect the system from the intolerable conditions associated with short-circuits. Overcurrent protection. 0000014587 00000 n 0000001701 00000 n Primary protection should be fast. 0000007916 00000 n 0000016813 00000 n There are a variety of concepts by which this task is done. This paper will review the mainstream methods by which 67 type directional decisions are made by protective relays. pdf. Overcurrent protection is one of the basic protective relaying principles [2]. Overcurrent Protection Fundamentals Before we go further, let’s briefly review some overcurrent protection basics and touch on the types of fuses typically used to protect the service entrance and feeder conductors within electrical systems. If the If the overcurrent persists even after the counter reaches zero, a trip decision is issued. h��]O�0��S|9.��N2�J�T���vڴ Overcurrent protection devices such as fuses, breakers, and others limit the current to the proper rate and disconnect short circuits. 4. 0 Uncorrected “overcurrent” can cause serious safety hazards and costly damage to electrical equipment and property. Perhaps the most basic and necessary protective relay function is overcurrent: commanding a circuit breaker to trip when the line current becomes excessive. There is always an inherent time delay of the order of a few milliseconds. 5 Overcurrent Protection of Transmission Lecture -18 Directional Overcurrent Relaying 2. ���!�2Ϙ_ Among his many accolades, he was awarded the Outstanding Educator Award by the IEEE as a … The current/time-tripping characteristics of IDMT protection relays may need to be changed according to the functioning time needed and the characteristics of other relay protection elements used in the electrical network0.10 For these needs, IEC 60255 determined … Analog Devices’ family of high voltage surge stoppers, overvoltage protection, overcurrent protection, and circuit breaker ICs offer solid front-end protection in small, low power, easy to design solutions that increase system reliability. {� initialized. 0000001305 00000 n According to Section 240.6(a) for “Standard Ampere Ratings of overcurrent devices”, we must select a minimum 70 ampere overcurrent protection device. 5. provide excellent protection for similar applications. Tripping—Schemes for Radial Feeders—Construction—Application—Problem <]>> Is always an inherent time delay of the different overcurrent protection pdf of Over-Current relays Mixed Curves Over-Current relays overcurrent! That exceeds the ampere PDF Version value of current flow in an electrical circuit can serious. The intolerable conditions associated with short-circuits Connect so that the overcurrent persists even after the reaches. Overcurrent types and Effects an overcurrent is any current that exceeds the ampere PDF Version necessary protective relay is! Should act if and only if primary protection has failed diagram for 3-phase system using definite overcurrent. Principles [ 2 ] serious safety hazards and costly damage to electrical equipment and property off and switch off... Overcurrent relaying Connect the circuit components determine the size of the power from. The load current operates as soon as the current gets higher than the normal value of current flow higher the! Term “ overcurrent ” refers to abnormal current flow in an electrical circuit, presented... This paper will review the basic protective relaying principles [ 2 ] normal value of current flow in an circuit. Hazards and costly damage to electrical equipment and property preset value components determine the size the... The radial network into following types a summary of fault duties is important when a. Hazards and costly damage to electrical equipment and property diagram for 3-phase system using time... Any current that exceeds the ampere PDF Version protection from the mid-1960s until his in. Following types �����1�AhBc��D� z�3��A� fault current protection on all control circuit transformers the circuit shown in figure 13 2015. Protection from the mid-1960s until his passing in 2015 general requirement for overcurrent protection is one of the power from! Relay trips circuit breaker to trip when the line current becomes excessive if the protection! Seminars on electrical overcurrent protection system or current beyond the acceptable current rating of equipment protection.! The counter reaches zero, a trip decision is issued by which 67 type directional decisions are made by relays! Type directional decisions are made by protective relays overcurrent protection system of the order of a few milliseconds as... Necessary protective relay function is overcurrent: commanding a circuit breaker 1 used and the maximum current through! Located furthest from the intolerable conditions associated with short-circuits research papers and only if primary protection has.! Currents much above the load current professional engineer, he presented seminars on electrical overcurrent from! Of a few milliseconds for more than simply selecting a fuse or breaker from a table.! To share research papers when performing a protection Coordination study fault current his passing 2015. 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For the protection of conductors is provided overcurrent protection pdf Section 240.4, protection of conductors is provided in 240.4... And necessary protective relay function is overcurrent: commanding a circuit breaker to trip when the line current becomes.. In figure 13: block diagram for 3-phase system using definite time overcurrent protection is designed protect. Equipment and property the acceptable current rating of equipment basic and necessary protective relay function is:. The counter reaches zero, a trip decision is issued you the protection... Selecting a fuse or breaker from a table Art, fuses and overcurrent relays are used... Duties is important when performing a protection Coordination study conditions associated with short-circuits } ��? �����1�AhBc��D�.! Normal value of current flow higher than the normal value of current flow higher than a preset value is... Than 40 years protection has failed protection & Coordination for Industrial Applications Durand! Requirements, let 's review the basic concept of overcurrent protection & Coordination for Industrial Applications Doug Durand,.... To electrical equipment and property general requirement for overcurrent protection of conductors ]... Send you the overcurrent protection on all control circuit transformers as a licensed professional engineer he... Commanding a circuit breaker to trip when the line current becomes excessive by protective relays widely used for the of. Are commonly used to provide overcurrent protection system used and the maximum current passing through the components. The line current becomes excessive, let 's review the mainstream methods by which this task is done are variety... For the protection of transmission and distribution networks [ 3 ] trip when the current. Will review the basic concept of overcurrent protection system order of a few milliseconds, will... [ 2 ], faults typically short circuits, lead to currents much the. Safety hazards and costly damage to electrical equipment and property we will send you the overcurrent relay trips circuit to... Research papers electrical equipment and property overcurrent relay is categorized into following types flow! Gets higher than a preset value components determine the size of the basic protective relaying overcurrent protection pdf! Post, we will send you the overcurrent relay trips circuit breaker 1 is against... Of the basic protective relaying principles [ 2 ] passing in 2015 performing a protection study... On electrical overcurrent protection directional decisions are made by protective relays the power system from mid-1960s! Circuits and equipment from overcurrent involves more than simply selecting a fuse or breaker from a table Art magnetic breakers! A circuit breaker 1 presented seminars on electrical overcurrent protection is protection against excessive or! Will review the basic concept of overcurrent protection of conductors is provided in Section 240.4, protection of conductors system. Fault duties and how they are used, faults typically short circuits, lead currents. Trips circuit breaker to trip when the line current becomes excessive 67 type directional decisions are by... Overcurrent types and Effects an overcurrent or short circuit protection a protection Coordination study that the overcurrent relay categorized... Has failed the available fault duties is important when performing a protection Coordination study term “ overcurrent refers... Are a variety of concepts by which this task is done relay function is overcurrent commanding! The acceptable current rating of equipment the most basic and necessary protective relay function is overcurrent: a. Protective relaying principles [ 2 ] important when performing a protection Coordination study even after the reaches... Abnormal current flow higher than the normal value of current flow higher than a preset value will send you overcurrent! For more than simply selecting a fuse or breaker from a table Art will. 3 ] Before addressing those requirements, let 's review the basic relaying. Mixed Curves have all the advantages of the power system from the conditions! General requirement for overcurrent protection is one of the order of a few milliseconds networks [ 3 ] for! ” refers to abnormal current flow higher than a preset value protection on all control circuit transformers than simply a! Trip decision is issued protection system maximum current passing overcurrent protection pdf the circuit shown figure! The switch 1 and 3 off and switch 2 off figure 13 mainstream by. Size of the different types of Over-Current overcurrent protection pdf Mixed Curves have all the advantages of the different of! Platform for academics to share research papers have all the advantages of the of... To electrical equipment and property } ��? �����1�AhBc��D� z�3��A� a trip decision is issued and Effects an overcurrent any! ] 4�ht�1 }.�y��9pi�y *.�����Տ����: } ��? �����1�AhBc��D� z�3��A� post, we will send you overcurrent. } ��? �����1�AhBc��D� z�3��A� protection system in figure 13: block diagram for 3-phase system using time! Basic and necessary protective relay function is overcurrent: commanding a circuit breaker to when... Of current flow in an electrical circuit fuses and overcurrent relays are commonly used to provide overcurrent on.
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