directional overcurrent relay pdf

@`� �8�a��F�> `e`��H��.XD�� 3#��\k�[3``�v �%�y��o�\��xxx��00. DIRECTIONAL OVERCURRENT RELAY. The same principle applies for the Directional Overcurrent Ground Relays Types IRP, IRC and IRD For overcurrent unit: Entering the curve in Figure 24 at multiples of pickup equal to 4.6, the closing time for instantaneous over-current is 16 ms. They are available with either inverse, very inverse or extremely inverse time characteristics. The overcurrent relay is defined as the relay, which operates only when the value of the current is greater than the relay setting time. The matrix "data" below is the data captured from a COMTRADE "*.dat" file. Directional overcurrent relays for ground fault protection are not usable on non grounded systems. It contains two relaying units, over current units and the other a directional unit. Application Directional relay assemblies are used for overcurrent or earth fault protection when selectivity is required, e.g. There are a variety of concepts by which this task is done. The negative sequence current and voltage are obtained by means of self-contained (Forward, Reverse) â¢ Directional relays may or may not make use of directionally controlled instantaneous units. In [9] A new design of Overcurrent relay OCR by using FPGA and present the type of IDMT for OCR protection . Introduction 1.1 The role of directional protection equipment p. 4 1.2 Applications p. 4 1.3 The codes and symbols of the various relay types p. 5 2. Depending on the time of operation the overcurrent relay is categorized into following types. Current Polarization: For providing direction feature in earth fault relay we can also use current as refrenec phasor which is called current polarization. Directional relay coordination in a mesh system is iterative. H��n1�{�S��G�A {. When â¦ Learn more about Chapter 7: Directional Overcurrent Relays on GlobalSpec. MiCOM P123, P126 & P127 can indicate the phase(s) in fault by configuring output relays (first stage only) Three-phase & earth-fault directional overcurrent (67/67N) Each of the three-phase overcurrent stages of P127 & earth fault stages Lecture -18 Directional Overcurrent Relaying %PDF-1.2 %�� the RP and FP relay elements should be similar in function. The supply continues overfeeder 1. 13 0 obj << /Linearized 1 /O 15 /H [ 1262 285 ] /L 42503 /E 27067 /N 2 /T 42125 >> endobj xref 13 43 0000000016 00000 n 0000001207 00000 n 0000001547 00000 n 0000001754 00000 n 0000002016 00000 n 0000002037 00000 n 0000002827 00000 n 0000003626 00000 n 0000003850 00000 n 0000004030 00000 n 0000004051 00000 n 0000004755 00000 n 0000005596 00000 n 0000005812 00000 n 0000006660 00000 n 0000006857 00000 n 0000006878 00000 n 0000007758 00000 n 0000007874 00000 n 0000008174 00000 n 0000008253 00000 n 0000008459 00000 n 0000009243 00000 n 0000009264 00000 n 0000010116 00000 n 0000010177 00000 n 0000010238 00000 n 0000010259 00000 n 0000010949 00000 n 0000010970 00000 n 0000011849 00000 n 0000012641 00000 n 0000012856 00000 n 0000012877 00000 n 0000013630 00000 n 0000013651 00000 n 0000014441 00000 n 0000015360 00000 n 0000016286 00000 n 0000016364 00000 n 0000026839 00000 n 0000001262 00000 n 0000001526 00000 n trailer << /Size 56 /Info 12 0 R /Root 14 0 R /Prev 42115 /ID[<820fab85338d5f26a182071cc96fc3de><820fab85338d5f26a182071cc96fc3de>] >> startxref 0 %%EOF 14 0 obj << /Type /Catalog /Pages 11 0 R >> endobj 54 0 obj << /S 98 /Filter /FlateDecode /Length 55 0 R >> stream guidance on applying and setting modern directional relays. DIRECTIONAL OVERCURRENT RELAY. The MiCOM P12x/y relays have separate instantaneous and delayed information for each stage. Relays have five current and four voltage inputs they are housed in E6 or E8 cases. But in a loop as shown in fig 19.1, the last relay to be 36 PROTECTIVE RELAY TYPES 3 CURRENT, VOLTAGE, DIRECTIONAL, CURRENT (OR VOLTAGE)-BALANCE, AND DIFFERENTIAL RELAYS Chapter 2 described the operating principles and characteristics of the basic relay elements. Directional overcurrent protection The assemblies for phase-overcurrent protec-tion contain RXPDK 21H as directional relay. The type KRQ relay is a high-speed directional overcurrent ground relay in which the directional unit operates on negative sequence current and voltage, and the over-current unit operates on residual or ground current. Timing characteristics Instantaneous relay,Definite time lag relay,Inverse time lag relay,Inverse definite minimum time (IDMT) lag relay. h�b```f``R``d`�� Ȁ �L@9��ߙx10(�O��`��3B�V�1˞p��i�|�n��U��]��J;̺ҟ��Z�j��h�M��(��@#�Kp04Jp4�l��@��A4�@r�ؽb�)��1 �( �"�,�]��b$��@D- ��LN This relay is also called earth leakage induction type relay.The overcurrent relay operates when the current in the circuit exceeds a certain preset value.The induction type nondirectional overcurrent relay has a construction similar to a watthour meter, with slight modification.The figure below shows the constructional of nondirectional induction type overcurrent relay. The device is provided by the use of extra voltage inputs to the protection relay. Hence, earth fault directional unit will not pick-up. endstream endobj 211 0 obj <> endobj 212 0 obj <>/ProcSet[/PDF/Text/ImageB]/XObject<>>>/Rotate 0/Type/Page>> endobj 213 0 obj <>stream The relay setting is 50% to 200% in steps of 25%. 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