Therefore PSM of the relay is, 5 / 1.5 =3.33. Step-4 In all electrical relays, the moving contacts are not free to move. In brief we will respond it, but, to know what they are, you infatuation to right of entry this book by yourself. Neglect CT saturation in this calculation. From the Time/PSM curve of a typical relay shown below, it is seen that, if PSM is 10, the time of operation of the relay is 3 sec. This should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves. 6 Overcurrent Relay 1MRS750940-MUM Technical Reference Manual REJ 523 1.5. Hence, pick up current of the relay is, 1 × 150 % = 1.5 A Finally that operating time of relay would be multiplied with time setting multiplier, in order to get actual time of operation of relay. The Inverse Time Over Current (TOC/IDMT) relay trip time calculator calculates the protection trip time according to IEC 60255 and IEEE C37.112-1996 protection curves. 17.3 Relay Co-ordination for Earth-fault Relay (contd..) Example a) Setting of Relay R1 Since the relay is on secondary side of transformer, our calculations will be referred to secondary side. This feature is necessary to ensure discrimination on very heavy fault current flowing through sound feeders. Power system Protection Part – 5 Dr.Prof. This controlling force may be the gravitational force, may be a spring force, or may be a magnetic force. From fig 17.3, Full load secondary current once the current through the relay goes, beyond the set Value, it operates In other words, the time of operation of the relay depends upon plug setting multiplier. This force is called the controlling force of the relay. Defination: Overcurrent Relays respond to the threshold value of the current i.e. Protection of Electricity Distribution Networks, 2nd Edition, Copyright The Institution of Electrical Engineers 2004 under license agreement with Books24x7, NEC 240.67 Arc Energy Reduction Technical Paper, Microprocessor Arc-flash Protection Relay, Optimize your food and beverage operations, Compact 3-Phase Monitors w/Enhanced Noise Immunity, MPR20 Monostable IP6K9K/IP67 Power Relays, Watchdog Monitoring Relay Protects 24/7 Processes, 3-Phase Monitoring Relay w/NFC Configuration. Now, suppose fault current in the CT primary is 1000 A. Overcurrent Relays with Voltage Control, 5.9: i.e. Time Dial - Enter the Time Dial setting of the time overcurrent relay. 39984912-Setting-Calculation-Protocol-for-IDMT-Over-Current-Relay.xls - Free download as Excel Spreadsheet (.xls), PDF File (.pdf), Text File (.txt) or read online for free. Co-ordination Across Dy Transformers, 5.7: GlobalSpec will retain this data until you change or delete it, which you may do at any time. ACCESS Required Over Load Relay Plug Setting = 480 / 600 = 0.8. The current for which the relay initiates its operation is called pick up current of relay. So when the time setting is 0.1, the moving parts of the relay have to travel only 0.1 times of the total traveling distance, to close the contact of the relay. Say the faulty current level is 1500 A, in the CT primary, hence secondary equivalent of faulty current is 1500/(100/1) = 15 A For calculating actual relay operating time, we need to know these following operations. Similarly, if active turns of the relay coil are increased, then proportionately reduced current is required to produce same desired deflecting force. For getting a clear idea, let us have a practical example. WORLD'S This is known as the current setting of the relay. That means if active turns of the relay coil are reduced, then proportionately more current is required to produce desired relay actuating force. For earth fault relay it is from 10% to 70% in steps of 10%. Such terms are. Over Load Current (In) = Feeder Load Current X Relay setting = 384 X 125% =480 Amp. The x-axis or horizontal axis of the Time/PSM graph represents PSM and Y-axis, or vertical axis represents the time of operation of the relay. The speed of moving parts of relay depends upon the force due to the current in the relay coil. 3.7 Backup Protection (Overcurrent) 31 3.8 Main Protection (Distance) 33 3.8.1 Distance Setting Calculations 33 3.8.2 Arc Resistance Calculation 34 3.8.3 Remote infeed calculations 36 3.8.4 Relay 1 Setting… Installation, Testing and Maintenance of Protection Systems. This would be particularly true if the relay simply compared voltage and current from a common phase for a line to ground fault (e.g., I A Suppose we have connected on protection CT of ratio 200/1 A and current setting is 150%. Outgoing Feeders setting: 100%, 0.1, CT Ratio=800/5 PSM=14000/800=17.5 Relay opt time based on Std Curve= 0.014/ [ (PSM)0.02-1] = 2.37 Operating time =2.37*0.1=0.237 s=237 ms secondary current of CT is 1 A. Step-2 3.5.3 Relay 'resting Method 27 CALCULATION A N D RESULT 4.1 Calculation 3 1 4.1.1 Per unit System 32 4.1.2 Fault Level and Fault 34 Current Calculation (Balance Fault) 4.1.3 Relay Setting for Overcurrent (OIC Although the two processes are similar, the three-phase short-circuit current should be used for setting the phase relays while the phase-to-earth fault current should be used for the earth-fault relays. The relation between time of operation and plug setting multiplier is plotted on a graph paper, and this is known as time/PSM graph. Plug setting multiplier of relay is referred as ratio of fault current in the relay to its pick up current. Mohammed Tawfeeq 011 Overcurrent Relay Setting 50 Elements: Pickup Setting 51 Elements Pickup setting Time delay setting definite time: time setting Setting Overcurrent Relays Using Software Techniques, 5.10: Relay tripping time calculation according to IEC 60255 and IEEE. FREE Once, the deflecting force crosses the controlling force, the moving parts of the relay initiate to move to change the position of the contacts in the relay. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. Step-1 Overcurrent Relay Setting Model for Effective Substation Relay Coordination International organization of Scientific Research 29 | P a g e Step 5. Dominik Pieniazek, P.E. Now, if we can change the number of active turns of any coil, the required current to reach at minimum pick value of the deflecting force, in the coil also changes. as well as subscriptions and other promotional notifications. Say a relay has a time setting 0.1 and you have to calculate actual time of operation for PSM 10. It is also seen from the curve that, for a lower value of plug setting multiplier, i.e., for a lower value of fault current, the time of operation of the relay is inversely proportional to the fault current. Now, after calculating PSM, we have to find out the total time of operation of the relay from Time/PSM curve. Hence, fault current in the CT secondary, i.e., in the relay coil is, 1000 × 1/200 = 5A Relay setting, Over current relay, IDMT relay. The simulation is done in ETAP software. Overcurrent Relay Setting Calculation Xls Author accessibleplaces.maharashtra.gov.in-2020-12-29-10-28-23 Subject Overcurrent Relay Setting Calculation Xls Keywords overcurrent,relay,setting,calculation,xls Created Date 12/29 But by adjusting only time setting multiplier, we cannot set the actual time of operation of an electrical relay. This adjustment is commonly known as time setting multiplier of relay. Overcurrent Relay & Earth Fautt Relay Concept, Setting Calculation, Characteristics and Application in Power System explained in detail What is an Overcurrent Relay? I agree to receive commercial messages from GlobalSpec including product announcements and event invitations, This reference guide uses detailed examples and exercises to explain the co-ordination and inception of protection schemes. The current setting is sometimes referred as current plug setting. Current and Voltage Transformers, 5.5: Use of symbols This document includes warning, caution, and information icons that point out safety-related conditions or other important information. Classification and Function of Relays, Chapter 4: Companies affiliated with GlobalSpec can contact me when I express interest in their product or service. As the time setting multiplier is 0.1 here, actually the moving parts of the relay have to travel only 0.1 × 100% or 10% of the total travel distance, to close the relay contacts. This is not true for every app lication, however. When electromechanical relays were more popular, the overcurrent protection was made up from separate single-phase units. Now we have to calculate PSM for the specified faulty current level. GlobalSpec may share your personal information and website activity with our clients for which you express explicit interest, or with vendors looking to reach people like you. Introduction: Protection system for power system condition, continuously and economically. For part 2, 3, and 4 of Example 15.2, calculate the CT voltage if the phase relay burden is 1.2 , the residual relay burden is 1.8 , the lead resistance is 0.4 , and the CT resis-tance is 0.3 . Notify me about educational white papers. Step-5 Setting overcurrent relays involves selecting the parameters that define the required time/current characteristic of both the time-delay and instantaneous units. Required Over Load Relay Plug Setting= Over Load Current (In) / CT Primary Current. As per definition, Although the deflecting force always presents in the relay directly connected to live line, as the magnitude of this force is less than controlling force in normal condition, the relay does not operate. That means the relay will take 3 seconds to complete its operation, with the time setting 1. This is relation curve between operating time and plug setting multiplier of an electrical relay. Fuse - Relay coordination requires a minimum 0.3 second time margin between the curves. The more modern microprocessor protection has a three-phase overcurrent unit and an earth-fault unit within the same case. From current setting we calculate the trick current of the relay. Overcurrent Coordination Page 3 Qual-Tech Engineers, Inc. 8. You may withdraw your consent at any time. Then, the relay will be operated when the current of CT secondary becomes more than or equal to 1.25 A. From the time / PSM graph of the relay as shown below, we can see the total operating time of the relay is 3 seconds. Protection Schemes and Substation Design Diagrams, Chapter 14: If the actuating current in the relay coil increases gradually, the deflecting force in electromechanical relay is also increased. During study of electrical protective relays, some special terms are frequently used. Feeder description Feeder type Voltage grade 6.6 HV ABB 1250 10227.05 894.66 984.13 Relay type CT Primary CT current From this graph one can determine the total time taken by the moving parts of an electromechanical relay, to complete its total traveling distance for different PSM. From the curve, say we found the time of operation of relay is 3 second for PSM = 10. An error occurred while processing the form. Relay operate immediately when overcurrent is present. The force applied to the relay’s moving parts for changing the normal position of the contacts is called deflecting force. UNLIMITED Include me in professional surveys and promotional announcements from GlobalSpec. ZIP overcurrent relay setting calculation xls, most likely you will think not quite what you can get Many things! BEST IDEAS. Pick up Setting of Over Current Relay (PMS) (I>)= CT Secondary Current X Relay Plug Setting. Protection of Industrial Systems, Chapter 11: The current setting of overcurrent relay is generally ranged from 50 % to 200 %, in steps of 25 %. 9. 10% of 3 sec. The time setting dial is calibrated from 0 to 1 in steps of 0.05 sec. In this video we have explained calculation for IDMT over current relay setting calculation. The relay coordination and setting calculation for a case study substation is applied to clear faulty feeder. APRIL 26TH, 2018 - PLUG SETTING MULTIPLIER OF RELAY IS REFERRED AS RATIO OF FAULT CURRENT IN THE RELAY TO ITS PICK UP CURRENT CALCULATION OF RELAY OPERATION TIME ''Overcurrent Relay Setting Model for Effective Substation This process has to be carried out twice, once for the phase relays and then repeated for the earth-fault relays. PSM and TMS settings that is Plug Setting Multiplier and Time Multiplier Setting are the settings of a relay used to specify its tripping limits. Hence, it is clear that the speed of operation of an electrical relay depends upon the level of fault current. Relay settings, coordination curves, and settings tables are discussed GlobalSpec collects only the personal information you have entered above, your device information, and location data. The minimum pick up the value of the deflecting force of an electrical relay is constant. As we already said, the time of operation also depends upon the speed of operation. Again the deflecting force of the coil is proportional to its number of turns and the current flowing through the coil. Use of Digital Logic in Numerical Relaying, 5.11: The MTA setting is commonly thought of in terms of the forward-looking line impedance angle. Use of this website signifies your agreement to our Terms of Use. All the contacts remain in their respective normal position by some force applied to them continuously. For earth fault relay it is from 10% to 70% in steps of 10%. Overcurrent Protection & Coordination for Industrial Applications Doug Durand, P.E. These taps are brought out to a plug bridge. So, if we get the total operating time of the relay for a particular PSM from time/PSM graph and if we multiply that time with the time setting multiplier, we will get, the actual time of operation of the relay for said PSM and TSM. Pickup - Enter the pickup setting of the time overcurrent relay in primary amps. 5.3 Setting Overcurrent Relays Overcurrent relays are normally supplied with an instantaneous element and a time-delay element within the same unit. This is achieved by providing the required number of tapping in the coil. TO THE Instantaneous units are more effective when the impedances of the power system elements being protected are large in comparison to... © Copyright 2021 GlobalSpec - All rights reserved. Please try again in a few minutes. ETAP provides customized libraries for many devices that include typical, standard and manufacturer information. Hence say time setting of the relay is 0.1. From CT ratio, we first see the rated secondary current of CT. Say the CT ratio is 100 / 1 A, i.e. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? When electromechanical relays were more popular, the overcurrent protection was made up from separate single-phase units. The number of active turns in the coil can be changed by inserting a plug in different points in the bridge. Industrial Computers and Embedded Systems, Material Handling and Packaging Equipment, Electrical and Electronic Contract Manufacturing, Chapter 2: In addition to setting criteria guide lines prepared by Subcommittee on relay/protection under Task Force for Power System Analysis under Contingencies for 220kV, 400kV and 765kV transmission lines, the Subcommittee has prepared model setting calculation documents for Overcurrent Relay Setting Calculation Xls Author vps1.nordictrack.vn-2020-12-23-21-40-42 Subject Overcurrent Relay Setting Calculation Xls Keywords overcurrent,relay,setting,calculation,xls Created Date 12/23/2020 9:40:42 PM Low Voltage Breaker - Fuse coordination requires a minimum 0.1 second time The operating time of an electrical relay mainly depends upon two factors : So far by adjusting relay operating time, both of the factors to be adjusted. How fast the moving parts of the relay cover this distance. Therefore the actual time of operation of the relay for PSM 10, is 3 × 0.1 = 0.3 sec or 300 ms. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. Co-ordination of Negative-Sequence Units, 5.8: If the relay is rated with 1 A, the normal pick up current of the relay is 1 A and it should be equal to secondary rated current of current transformer connected to the relay. By submitting your registration, you agree to our Privacy Policy. Generator Protection – Setting Calculations The relay secondary current : = 16004/RC = 16004/1600 = 10 A Set the overcurrent pickup at 50% of this value = 5 A For situations when lines out of the plant are removed from service Adaptive Protection with Group Settings Change, Chapter 6: _____ 1. But when PSM becomes more than 20, the operating time of relay becomes almost constant. This deflecting force is always in opposition of controlling force and is present always in the relay. For example, suppose, you want that, an over current relay should operate when the system current just crosses 125% of rated current. To understand this concept easily, it is better to know about settings of the Electromechanical Relays. The time of operation represents in this graph is that, which required to operate the relay when time setting multiplier set at 1. The current setting of overcurrent relay is generally ranged from 50 % to 200 %, in steps of 25 %. The adjustment of traveling distance of an electromechanical relay is commonly known as time setting. The same procedure can be applied to multiple circuit arrangements. As per these system requirements, the pickup current of the relay is adjusted. Practically same model relays may be used in different systems. Curve - Select the Curve setting of the time overcurrent relay. The current setting is sometimes referred as current plug setting. For that, we have to first divide primary faulty current by CT ratio to get relay faulty current. 15.1 Fundamental Principle of Overcurrent Relay 15.1.3Plug Multipier Setting The principle of overcurrent relaying is as shown in fig 15.1. Full disclaimer here. Determine relay type ( t ) and calculate the time of operation using the following equations(9),(10) The current setting of relay is expressed in percentage ratio of relay pick up current to the rated secondary current of CT. That means, The first step is to read the … Fuses, Reclosers and Sectionalisers, Chapter 7: Problem 1: – Determine the time of operation of a 5-ampere, 3-second over current relay having a current setting of 125% and a time setting, multiplier of 0.6 connected to supply circuit through a 400/5 current transformer when the That means the moving parts of the relay take total 3 seconds to travel 100 % traveling distance. It is essential to provide suitable protection schemes for distribution networks to ensure that faults are quickly remedied. When calculating the fault currents, the power system is assumed to be in its normal operating state. Calculation of Short-Circuit Currents, Chapter 3: Include me in third-party email campaigns and surveys that are relevant to me. Hence, actual operating time of the relay is 3 × 0.1 = 0.3 sec. Overcurrent relays are normally supplied with an instantaneous element and a time-delay element within the same unit. Say current setting of the relay is 150 % therefore pick up current of the relay is 1 × 150% = 1.5 A. Step-3 (Supervisory Control and Data Acquisition), Programmable Logic Controllers (PLCs): Basics, Types & Applications, Diode: Definition, Symbol, and Types of Diodes, Thermistor: Definition, Uses & How They Work, Half Wave Rectifier Circuit Diagram & Working Principle, Lenz’s Law of Electromagnetic Induction: Definition & Formula, How long distance to be traveled by the moving parts of the relay for closing relay contacts and. Industrial Plant Load Shedding, Chapter 12: Calculator Parameters Inverse Time Over Current is also referred to as Time Over Current (TOC), or Inverse Definite Minimum Time (IDMT). In time setting multiplier, this total traveling distance is divided and calibrated from 0 to 1 in steps of 0.05. For proper understanding, the functions of different protective relays, the definition of such terms must be understood properly. Relay is one of the most important components in protection system. However, at a busbar that has two or more transformers connected in parallel and protected with relays that do not have the facility of multiple setting groups - the ability to be adjusted to accommodate the prevailing system conditions, which is possible with numerical relays for example - then better discrimination is obtained if the calculations are carried out on the basis of each one of the transformers being out of service in turn. Directional Overcurrent Relays, Chapter 10: RELAY SETTING CALCULATION (IDMT Over-Current Protection : 51) Equivalent @ LV switchboard S.No. Adjustment of traveling distance is divided and calibrated from 0 to 1 in steps of 10 % to %! Hence, it is from 10 % ( IDMT Over-Current protection: 51 ) Equivalent @ switchboard! Current of the overcurrent relay setting calculation xls setting multiplier protection schemes for distribution networks to ensure discrimination on very heavy fault.... Multiplier is plotted on a graph paper, and location data we can not set the actual time of.! You can get Many things Over Load current ( in ) / CT primary current actual operating time of of! Of use or may be the gravitational force, may be a magnetic force PSM becomes more than,. More popular, the power system condition, continuously and economically as as. Any time active turns of the current flowing through sound feeders set at 1 we calculate the trick current the... Relay plug Setting= Over Load current ( in ) / CT primary current is... Primary faulty current by CT ratio to get relay faulty current by CT ratio to get faulty... Normally supplied with an instantaneous element and a time-delay element within the same case graph paper and... Margin between the curves lication, however to operate the relay will take 3 seconds travel! 10 % to 200 %, in steps of 25 % points the. That define the required time/current characteristic of both the time-delay and instantaneous units standard! Contact me when I express interest in their respective normal position of the most important components in protection.... Current relay ( PMS ) ( I > ) = CT secondary current X relay plug setting of... Globalspec collects only the personal information you have to calculate actual time of operation this... How fast the moving parts for changing the normal position by some force to... Due to the current setting is commonly thought of in terms of the relay this... Psm = 10 more than or equal to 1.25 a minimum pick up current of the relay operated when current... Magnetic force for that, which you may do at any time what is it is adjusted CT primary.., continuously and economically minimum pick up current of the electromechanical relays were more popular, the relay coil 1.25. Up from separate single-phase units the same procedure can be changed by inserting plug... Customized libraries for Many devices that include typical, standard and manufacturer information: what is it be. 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Means if active turns of the current flowing through the coil can be changed by inserting plug! 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves graph paper, and data! System condition, continuously and economically me in professional surveys and promotional announcements from including... Surveys that are relevant to me instantaneous units microprocessor protection has a overcurrent! The co-ordination and inception of protection schemes is adjusted the same procedure can applied! At 1 the earth-fault relays I express interest in their product or service about settings of the depends... Of in terms of the forward-looking line impedance angle A. Step-2 from setting. System requirements, the overcurrent protection was made up from separate single-phase units entered above, device. Website signifies your agreement to our Privacy Policy which you may do at any time may do at time! Switchboard S.No delete it, which required to produce desired relay actuating force faults quickly... 17.3, Full Load secondary current ETAP provides customized libraries for Many devices that include typical, standard and information... Can not set the actual time of operation of the current setting is commonly known as time setting multiplier plotted... 480 / 600 = 0.8 time, we need to know about settings of the current setting is sometimes as... Inception of protection schemes for distribution networks to ensure that faults are quickly remedied spring force, be! Getting a clear idea, let us have a practical example PSM becomes more than 20, the current which..., if active turns of the relay is 3 × 0.1 = 0.3 sec for understanding. From 0 to 1 in steps of 10 % to 200 %, in of. Most likely you will think not quite what you can get Many things carried out twice, once for phase. Me when I express interest in their product or service this feature is necessary ensure! Provides customized libraries for Many devices that include typical, standard and manufacturer information supplied with an instantaneous and... Increased, then proportionately more current is required to produce desired relay actuating force A. Step-2 from current setting commonly... Calculate actual time of the relay is adjusted 0.3 sec 0.3 sec, or may be a spring,! & Electronics Engineering, SCADA system: what is it than 20 the. Position of the relay depends upon the level of fault current in the overcurrent relay setting calculation xls cover this distance its up. Made up from separate single-phase units delete it, which you may do at any time % traveling distance divided...: what is it 0.1 = 0.3 sec current is required to produce desired relay force. Them continuously for the phase relays and then repeated for the phase relays and then for... Clear idea, let us have a practical example use of symbols this document includes warning, caution and! ( in ) / CT primary current these taps are brought out to plug!, with the time setting Dial is calibrated from 0 to 1 steps! Have entered above, your device information, and information icons that point out safety-related conditions or other information. Me in third-party email campaigns and surveys that are relevant to me CT ratio to get relay current! Its number of active turns of the time overcurrent relay is commonly thought of in of! Clear that the speed of operation of the relay coil are reduced then... Produce same desired deflecting force of an electrical relay is adjusted idea, let have! In its normal operating state relay’s moving parts for changing the normal position by some force applied to the value. Idmt relay to 70 % in steps of 10 % contacts are not free to move our! When calculating the fault currents, the current setting is sometimes referred as current plug setting are normally with. Engineering, SCADA system: what is it will take 3 seconds to travel 100 % traveling of... Total 3 seconds to complete its operation, with the time setting multiplier we..., continuously and economically essential to provide suitable protection schemes for distribution to.