(1) Overload elements Overcurrent elements Time elements (2) Open-phase elements (3) Reverse-phase elements These functions are described in more detail below. yiS�KMd���f��ZX�����R8�����!��05��XJPc)A �vqX/?L��J+f�ݘU!QFO�eN�H���1jR5�Xh%C�8h�U�Qn3�+ZV��a�A�l%�������ͬ�0�A��w������ifyhOk^���¬a}ά�0+�2[�`�€b�l��2�l������5G@(��Y��Y\_b��SG����u2�d8����}�j�A���c#uZ�V8Lj�WZA(a_[m�j�ۥ�z����I���oN��њJ��tf'A�����q=u�P�]�)��ݸa/��Us�N���0J���i L�u �}Z�� LE| BJ��ifgv���y�]p�� �[�@@����C}�D���d�dG>&G䈃w���c}ÕW�g0���z���g�����×�����q��כ7�__?� ���uw��e�ǟw�"?xW� ��.y��.�x�����ߏ��'����woovw�����x}:.�\\l.�9�����s����?�n�A��@��B��a��7A7x�������v�as������y�y��������_�k{_���>H���ݸ·�˜��Nz�����o���u�?����AP�A�@�Ň��A7K�шr?p��/J~�s�3���~���7�M��'�lbCk,�^�+�Bs��ukҵ�炤�"���KUk� Z�I�X,�8�R��̕�CQ��C��C��C��þ��pX���ܖ�=r+����LO~H. Æs¢}Kå4p´— œ2˜Æ$1b àJpbªªë8t;ÏX+olzŸH�ÀÔ Â5>Qºi¡Ü¢rø4î|÷ß|•¨aæ.Q¢Çyk†Ôm Instantaneous overcurrent relay takes no time in giving tripping command once overcurrent is sensed. TARGET AND SEAL-IN UNIT TABLE I ,.---2 Amp Tap Carry-Tripping Duty 30 Amps Carry Continuously 3 Amps Leave a comment on this post, we will send you the Overcurrent Fundamental. Overcurrent Elements The motor will catch fire if it is overloaded and overcurrent is Definite time non-directional overcurrent relay sends trip signal after a specific time to the circuit breaker. �@ �W��J��*����`>��;Ն�2�����?�����Z&�]:���1 h�\�� hތ�1�0���Ar�\�@���R�M Technical data Current ratings 1A or 5A. Figure 1 – HRC fuses. 200:5 CT is connected to instantaneous relay and 500:5 is connected to inverse current characteristic relay. Z�4(��{�-�I�V>�zY{�*{�ްg�kO��b���V���ꐌ��Ū-��������3��!bX���.iO��j/�d7iY�j�o-@^� In addition to the differential function, a backup overcurrent protection for 1 winding/ star point is integrated in the relay. Phase­overcurrent pickup settings and ground ­overcurrent pickup settings are made independently. The Type IAC53 and IAC54 relays covered by these instructions are extended-range, single-phase time overcurrent relays with very inverse time/current characteristics. The transformer is one of the saturating type for limit-ing the energy to the instantaneous overcurrent unit at higher values of fault current and to reduce ct bur-den. The IFC51B, 5313 and 7713 relays also include a hinged—armature instantaneous overcurrent unit, which provides instantaneous tripping at high current levels. /� Go back to contents ↑ 1.2 Overcurrent relays. PDF Version While 50 and 51 (instantaneous and time overcurrent) relay functions monitor line current magnitude and guard against excesses, there are applications where the direction of line current is just as relevant as the magnitude. Overcurrent relays Overcurrent relaying is the simplest and cheapest type of protection used for protection of lines, transformers, generators and motor. They can be applied to medium and high voltage electrical systems as either main or backup protection. Time overcurrent protection is where a protective relay initiates a breaker trip based on the combination of overcurrent magnitude and overcurrent duration, the relay tripping sooner with greater current magnitude. INSTANTANEOUS OVERCURRENT AND VOLTAGE RELAYS TYPES PJC AND PJV INTRODUCTION APPLICATION * The Type PJC and Type PJV plunger relays are designed for general service. with SEL-501 dual overcurrent relays SEL-501 dual overcurrent relay elements • Overcurrent protection for two (2) three-phase feeders • Instantaneous overcurrent relay (ANSI device 50H) • Feeder protectionNeutral instantaneous overcurrent relay (ANSI device 50NH) • Definite-time phase endstream endobj 492 0 obj <>stream Instantaneous non-directional overcurrent algorithm is used for fast tripping of shorts. INSTANTANEOUS OVERCURRENT RELAYS GE Meter and Control 205 Great Valley Parkway Malvern, PA 19355-1337. Type CDG 31 is a triple pole version of the type CDG 11 with three overcurrent units or two overcurrent units and one earthfault unit in the centre. 5.1 Overcurrent relays The basic element in overcurrent protection is an overcurrent relay. Title: Three-phase instantaneous overcurrent Created Date: 7/13/2001 9:57:58 AM 52 : Circuit breaker . If the fault is not cleared by this relay (due to some failure), over current relay (inverse type) on the Pot Room incomer will operate in 230 msec, which acts as a backup. The instantaneous unit is not included in the IFC51A, 53A or 77A relays. ����E��"�=[�)b��v"h�I:�G��J�\�����C��۸�3I�\���0 m�4 In such a relay, the relay contacts close immediately after the current in the relay coil exceeds that for which it is set. 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 … When supervision functions are required, the dual-powered relay offers • The value of preset current above which the relay operates is called the pickup value. Features and Benefits Electrically separate contacts available Drawout case Applications Three phase and ground fault in circuit breaker failure schemes Protection and Control Three phase O/C Ground instantaneous O/C Time delay operation Overcurrent relays Types Based on operating time characteristics, normally defined by the time vs. current curve (or T-I curve), there are three main types of overcurrent relays: Instantaneous In Definite Time Overcurrent Relay, there is a fixed intentional user settable operating time delay Td. %PDF-1.6 %���� 67 : Directional-overcurrent relay . h��X]o7�+�'��$�!i䡨a�@`�+-�8�U���]����|��h� Instantaneous Overcurrent relay; Instantaneous Overcurrent Relay. It is of two types: instantaneous over current (IOC) relay and definite time overcurrent (DTOC) relay. These relays are non directional and instantaneous when in operation. GEI-28803 INSTANTANEOUS OVERCURRENT RELAYS TYPE PJC APPL ICATION The Type PJC plunger relays are designed for general service. Protective Relaying System . D EFINITE TIME NON-DIRECTIONAL OVERCURRENT RELAY . The operating time of such relays can be of the order of milliseconds. �%"�E���z�^�U���x>]�n&̲�v�2� 87 : Differential relay . This means the operating time delay is zero and hence relay operation is instantaneous. The ANSI device number is 50 for an instantaneous overcurrent (IOC) or a Definite Time Overcurrent (DTOC) and 51 for the Inverse Definite Minimum Time. �@9�у�>���q=�2��b�+qP�Ç� �c�Lj�]�E>W����Cf���Т>s��l����V=��V@�K� ���5`�[fc�a�_ i|Տ�_�H�x��6!�i�X}�-h��.G@��=��؆P�%H���Q�� �Tʞ��H)����}cꤾ�1�Bޖ=��s��â%Q�c���0��f1�fez�2Q�$RG����^GdO{}�1x�..ݠ����|:�פ�5 A reed relay, one per pole, is … Here the fixed coil is fed from the circuit to be protected. • Relaying decision is based solely on the magnitude of the current. In a simple way electrical relay is shown in the figure above. 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