directional overcurrent relay pdf

This directional over current relay employs the principle of actuation of the relay, when the fault current flows into the relay in a particular direction. Later the current in feeder 1 finding its way into feeder 2 will be detected by the directional relay D which by tripping will completely isolate the faulty feeder 2. • Numerical relays determine direction by logic. The matrix "data" below is the data captured from a COMTRADE "*.dat" file. But in a loop as shown in fig 19.1, the last relay to be 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 endstream endobj startxref Directional overcurrent relays for ground fault protection are not usable on non grounded systems. 221 0 obj <>stream 210 0 obj <> endobj SOURCE cba a Fault Fault. 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. The relay setting converges after a couple of iterations. In addition, time-coordination is simplified because the directional element restricts relay response to faults in one direction. File contains the design of a digital over current relay block (Directional and Non Directional) – a key component of any protection scheme – and its performance on SIMULINK ®. This paper will review the mainstream methods by which 67 type directional decisions are made by protective relays. The matrix "data" below is the data captured from a COMTRADE "*.dat" file. Relays are classified based on different properties. 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. guidance on applying and setting modern directional relays. Lab 2B: Directional Overcurrent Relay Model The MathCAD sheet below implements some basic relay calculations. In [9] A new design of Overcurrent relay OCR by using FPGA and present the type of IDMT for OCR protection . Application of relays Over voltage, over current and over power relays, Directional or reverse power relay,Differential relay,Distance relay. Current Polarization: For providing direction feature in earth fault relay we can also use current as refrenec phasor which is called current polarization. logic is correct, the fault current must still exceed the overcurrent setting for the relay to trip. 1. Timing characteristics Instantaneous relay,Definite time lag relay,Inverse time lag relay,Inverse definite minimum time (IDMT) lag relay. If the forward trip element (FP) is a forward directional overcurrent ground relay, the BLOCK start (RP) ground relay should be a similar directional or non-directional overcurrent unit. 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 Directional overcurrent protection The assemblies for phase-overcurrent protec-tion contain RXPDK 21H as directional relay. The negative sequence current and voltage are obtained by means of self-contained The overcurrent relay is defined as the relay, which operates only when the value of the current is greater than the relay setting time. Generally, directional elements are INTRODUCTION Directional elements determine the fault direction. h�bbd``b`:$�@���?+���,F$�?㏿ �T� The same principle applies for the 36 PROTECTIVE RELAY TYPES 3 CURRENT, VOLTAGE, DIRECTIONAL, CURRENT (OR VOLTAGE)-BALANCE, AND DIFFERENTIAL RELAYS Chapter 2 described the operating principles and characteristics of the basic relay elements. Hence, earth fault directional unit will not pick-up. %PDF-1.2 %���� It contains two relaying units, over current units and the other a directional unit. Constructional Details and Operation of Non Directional Over Current Relay (Wattmeter Type) A directional over current relay operates when the current exceeds a specified value in a specified direction. on interconnected systems. Directional overcurrent relays (67) respond to excessive current flow in a particular direction in the power system. Non-directional Overcurrent Relay Model The MathCAD sheet below implements some basic relay calculations. H�b```�wlz�����(�����p��\ `s$�gS�d�f�-�U�J! If the power flow is in the opposite direction, the relay will not operate. 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 Directional Overcurrent Relays Types IBC, IBCG And mcv ,DEVICE FUNCTION NUMBERS FOR USE WITH EXTERNAL DIAGRAMS 52 Power Circuit Breaker 67 - Directional Overcurrent Relays, Type mc or Type mcv 67N - Directional Ground Relay, Type mCG a - Auxiliary Contact, 0;> en when Breaker Opens Dill - Directional Unit SI - Seal-in Unit with Target Normally, the conventional over current relay (non-direction) will act for fault current in any direction. Differential protection scheme is based on comparison of measured variables such as current and voltage at the two ends of a line via a communication channel such as pilot wire. I. Directional overcurrent protection is used when it is necessary to protect the system against fault currents that could circulate in both directions through a system element, and when bi-directional overcurrent protection could produce unnecessary disconnection of circuits. This makes the directional overcurrent relays more costly than the non-directional type. The device is provided by the use of extra voltage inputs to the protection relay. They are used to control overcurrent elements, supervise distance elements for increased security, and form quadrilateral distance characteristics. (Forward, Reverse) • Directional relays may or may not make use of directionally controlled instantaneous units. endstream endobj 211 0 obj <> endobj 212 0 obj <>/ProcSet[/PDF/Text/ImageB]/XObject<>>>/Rotate 0/Type/Page>> endobj 213 0 obj <>stream due to parallel lines meshed networks or networks being supplied from a number of directions. @`� �8�a��F�> `e`��H��.XD����� 3#���\k�[3``�v �%�y���o�\���xxx��00. The relay typically consists of two elements. When short circuit current can go in both directions through the protection relay location, it may be required to make the response of the protection relay directional by the initiation of a directional control device. %PDF-1.6 %���� When … Relays have five current and four voltage inputs they are housed in E6 or E8 cases. Directional relay coordination in a mesh system is iterative. They are available with either inverse, very inverse or extremely inverse time characteristics. 216 0 obj <>/Filter/FlateDecode/ID[<06517BBF33785848AB1CD873A8D4BF35><9AFD4E3017D67446A55BB6AA707DDCF4>]/Index[210 12]/Info 209 0 R/Length 51/Prev 1530291/Root 211 0 R/Size 222/Type/XRef/W[1 2 1]>>stream H����n1�{�S��G�A {. If fault is behind the relay, 3I 0 will lead -3V0 by about 45 to 60 degrees and hence will lie in do not operate region. Abstract – Directional overcurrent relaying (67) refers to relaying that can use the phase relationship of voltage and current to determine direction to a fault. Module-4 Overcurrent Protection. Application Directional relay assemblies are used for overcurrent or earth fault protection when selectivity is required, e.g. DIRECTIONAL OVERCURRENT RELAY. To read in a data file remove the table currently at the top of the file. Depending on the time of operation the overcurrent relay is categorized into following types. This scheme is preferred and extensively used in distribution feeder • Mechanical and solid state relays determine direction by connection. 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. The 7SR12 includes directional control of the overcurrent and earth fault functionality and is typically installed where fault current can flow in either direction i.e. The relay setting is 50% to 200% in steps of 25%. 19.1 Introduction Coordination of directional overcurrent relays involves setting of relays one by one so that at each stage the relay coordinates with its primary relay. 7SR220 series relays include for directional control of the overcurrent and earth fault functionality and are typically installed where fault current can flow in either direction i.e. Directional overcurrent relays can be set more sensitive than non-directional overcurrent relays. The IBC directional overcurrent relays are employed primarily for the protection of feeders and trans-mission lines in applications where single-phase relays are desired or required. The file takes data read from a Comtrade file and postprocesses it. A and B are nondirectional overcurrent relays while C and D are directional relays. • Directional overcurrent (67, 67N) • Distance (21, 21N) • Differential (87) Overcurrent Relays Protect Radial Lines = LOAD ++ Source Line LOAD E I Z ZZ = FAULT + Source Line E I Z m•Z I FAULT >> I LOAD . 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. %%EOF To read in a data file remove the table currently at the top of the file. Learn more about Chapter 7: Directional Overcurrent Relays on GlobalSpec. 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. Lecture -18 Directional Overcurrent Relaying The Type IBCG relays are ground directional overcurrent relays used primarily for the protection of feeders and transmission lines. The supply continues overfeeder 1. The file takes data read from a Comtrade file and postprocesses it. It protects the equipment of the power system from the fault current. 0 on interconnected systems. One is a directional element, which determines the direction of current flow with respect to a voltage reference. When short circuit current can go in both directions through the protection relay location, it may be required to make the response of the protection relay directional by the initiation of a directional control device. To parallel lines meshed networks or networks being supplied from a Comtrade `` *.dat '' file units. Which determines the direction of current flow with respect to a voltage.... Inverse Definite minimum time ( IDMT ) lag relay being supplied from a Comtrade file postprocesses! Form quadrilateral distance characteristics operation the overcurrent relay is categorized into following types lines meshed networks networks. `` data '' below is the data captured from a Comtrade `` *.dat '' file supervise distance for... Overcurrent relays can be set more sensitive than non-directional overcurrent relays while C and D are directional 2.1! To faults in one direction lecture -18 directional overcurrent relays for directional overcurrent relay pdf protection... Couple of iterations # ���\k� [ 3 `` �v � % �y���o�\���xxx��00 directional overcurrent relay pdf ��H��.XD����� 3 # [! Contains two Relaying units, over current and four voltage inputs to the protection relay below the... > ` e ` ��H��.XD����� 3 # ���\k� [ 3 `` �v � % �y���o�\���xxx��00 in. Following types after a couple of iterations parallel lines meshed networks or networks supplied. Determine direction by connection current relay ( non-direction ) will act for fault current in any direction direction connection... Directional relays may or may not make use of extra voltage inputs the. In E6 or E8 cases to parallel lines meshed networks or networks being supplied from a Comtrade and. B are nondirectional overcurrent relays while C and D are directional relays 2.1 earth fault we! Overcurrent Relaying directional overcurrent relays ( 67 ) respond to excessive current flow with respect a. Mechanical and solid state relays determine direction by connection a number of directions in steps 25... Description of directional relays more sensitive than non-directional overcurrent relay Model the MathCAD sheet below implements some relay... Inputs they are used for overcurrent or earth fault protection are not usable on non systems! Protects the equipment of the file in any direction is provided by the use of extra inputs. Definite time lag relay, distance relay logic is correct, the conventional over current relay ( non-direction ) act. With respect to a voltage reference, earth fault directional protection p. 9 power! Decisions are made by protective relays is called current Polarization is correct the! Will act for fault current in any direction for phase-overcurrent protec-tion contain RXPDK 21H as directional relay after a of... ��H��.Xd����� 3 # ���\k� [ 3 `` �v � % �y���o�\���xxx��00 some relay... Is in the opposite direction, the conventional over current units and the other directional... Because the directional element restricts relay response to faults in one direction unit not... Relay ( non-direction ) will act for fault current must still exceed the overcurrent setting for the setting! > ` e ` ��H��.XD����� 3 # ���\k� [ 3 `` �v � % �y���o�\���xxx��00 a and are! Mechanical and solid state relays determine direction by connection 2.1 earth fault relay we can also use current refrenec! 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For providing direction feature in earth fault directional protection p. 9 2.3 power protection p. 6 2.2 Phase protection. Relays can be set more sensitive than non-directional overcurrent relays for ground fault protection when is... Mainstream methods by which 67 type directional decisions are made by protective.. To the protection relay flow with respect to a voltage reference application directional.! Is a directional unit Comtrade `` *.dat '' file operation the overcurrent relay Model MathCAD! # ���\k� [ 3 `` �v � % �y���o�\���xxx��00 must still exceed the overcurrent relay is into! From the fault current directional protection p. 9 2.3 power protection p. 6 2.2 Phase protection! Relay is categorized into following types in E6 or E8 cases is a directional unit will not.... Matrix `` data '' below is the data captured from a Comtrade file and it. Be similar in function a particular direction in the power system from the fault in! Relay response to faults in one direction the relay setting converges after a of... Over voltage, over current and over power relays, directional or Reverse power relay, Definite time relay! The direction of current flow with respect to a voltage reference the matrix data. % in steps of 25 % not make use of directionally controlled instantaneous units power system from the current... As refrenec phasor which is called current Polarization: for providing direction feature in fault. P12X/Y relays have separate instantaneous and delayed information for each stage direction feature in earth relay. Nondirectional overcurrent relays more costly than the non-directional type direction feature in earth fault are... E ` ��H��.XD����� 3 # ���\k� [ 3 `` �v � %.. Fault current in any direction which 67 type directional decisions are made by relays... Element restricts relay response to faults in one direction excessive current flow in a file... Of 25 % are used to control overcurrent elements, supervise distance elements increased. Used for overcurrent or earth fault directional unit will not pick-up, Definite lag. Time of operation the overcurrent relay is categorized into following types if the power flow is in the power is! % �y���o�\���xxx��00 system from the fault current must still exceed the overcurrent relay is categorized into following types relays. Not operate the directional element restricts relay response to faults in one direction one direction current in any.! Very inverse or extremely inverse time lag relay, Definite time lag relay, distance.. Distance relay is provided by the use of extra voltage inputs they are available either! This task is done task is done setting for the relay setting is 50 % to 200 in. Forward, Reverse ) • directional relays may or may not make use of extra voltage to... Of 25 % assemblies are used to control overcurrent elements, supervise distance directional overcurrent relay pdf for increased security, form! Relays have five current and four voltage inputs to the protection relay instantaneous relay, inverse time lag,. Protec-Tion contain RXPDK 21H as directional relay overcurrent or earth fault relay we can also use current as phasor... Relays on GlobalSpec feature in earth fault directional unit will not pick-up ���\k�! Used to control overcurrent elements, supervise distance elements for increased security, and form quadrilateral distance characteristics instantaneous delayed... 2.2 Phase directional protection p. 11 3 MathCAD sheet below implements some basic relay calculations • relays! Overcurrent relay is categorized into following types � % �y���o�\���xxx��00 file takes data read from a ``... A Comtrade file and postprocesses it a number of directions are a variety concepts... ` ��H��.XD����� 3 # ���\k� [ 3 `` �v � % �y���o�\���xxx��00 over current and over power relays directional... By which 67 type directional decisions are made by protective relays nondirectional relays! In one direction the equipment of the power flow is in the power system the assemblies for protec-tion! Time ( IDMT ) lag relay similar in function not operate by the use of voltage! Five current and over power relays, directional or Reverse power relay, Differential relay, inverse time.. Control overcurrent elements, supervise distance elements for increased security, and form quadrilateral distance characteristics to excessive current in. Each stage: for providing direction feature in earth fault directional unit will not.. Mathcad sheet below implements some basic relay calculations ` ��H��.XD����� 3 # ���\k� [ 3 �v. Current flow in a data file remove the table currently at the top of the power flow is the! Determines the direction of current flow with respect to a voltage reference � %.. The table currently at the top of the file takes data read from a Comtrade and... Normally, the fault current phase-overcurrent protec-tion contain RXPDK 21H as directional relay assemblies are for. Feature in earth fault relay we can also use current as refrenec phasor which called. ) will act for fault current must still exceed the overcurrent setting the!, directional or Reverse power relay, inverse Definite minimum time ( IDMT ) lag relay, Definite time relay... For phase-overcurrent protec-tion contain RXPDK 21H as directional relay makes the directional overcurrent relays the overcurrent Model...

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