IDMT Relay High Current setting :Plug setting of Relay is 2.5 Amp and Time Delay (TMS) is 0.100 Sec, Relay Curve is selected as Normal Inverse Type; Calculation of Over Current Relay Setting: (1) Low over Current Setting: (I>) Over Load Current (In) = Feeder Load Current X Relay setting = 384 X 125% =480 Amp The content in electricalnotes.wordpress.com is for personal, non-commercial use only. We will start the transformer differential protection calculation with … Overcurrent ... point setting exceeds 1200 amps The ground fault pickup is divided into three 6 / 12. sections Earth leakage protection relays elr connections of overcur relay part 2 100 you can not reproduce,republish or communicate any of the content , including files downloadable from this website, without the permission of the copyright owner.The use of this content on any other websites breaches copyright Act. Maximum Load Current is 1000A .What is Over current (Long Time) and Short Circuit (Short Time) and Instantaneous setting of MCCB. Plug Setting Multiplier of Relay Plug setting multiplier of relay is referred as ratio of fault current in the relay to its pick up current. Related articles: Double Line to Ground Fault; Line to line fault; Symmetrical three phase fault; Example: Assumed that the generator below is solidly grounded and neglect the fault impedance. Ground fault currents are not transferred through delta-Wye transformer 1PH fault Current at 11 KV side when 2 transformers in service = 15.86 KA. Sorry, your blog cannot share posts by email. Short Time delay sets the amount of time the breaker will carry both a low level and high fault currents before tripping. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. Dial Setting=( Short Circuit Current/ MCB Rating) =4000/2000=2, Short Circuit Setting Isd=2xIn=2×2000=4000A. Case-1 for Old CT: Old CT Ratio- 600/1 A, PSM – 1.05. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. to aid in setting the relay elements correctly. GROUND FAULT. for Current Density of Bus Bar Material=1.6 ? With high resistance grounding, you need a relay on the grounded neutral to catch ground faults that are single phase to ground, since the relay on the neutral doesn’t care about load current. Relay Pickup current (Primary) = Plug Position (PSM) * … It is determines the level of fault current that will actuate a trip with no time delay. Instantaneous protection is time-independent. Calculation of Relay Pick up current: While changing CT with new one our objective is to respond the relay within same time for either case for same value of fault current. If the k factor is not accurate, therefore, fault reach (distance) will be … 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. For coordination of other MCCB we need I2t ON with 0.2 Sec delay. He is FIE ,MIE and CEng from Institution of Engineers,India. 7) Plug Setting Multiplier (PSM): It is the Fault current seen by the relay in the Multiples of Plug Setting. The ground differential pickup setting can be calculated as: (EQ 4) Note that phase CT primary is used as a unit for calculating the RGF settings. B/C AND I/ OF MCC: 15-30% OF BUSBAR RATING. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics. (B) I2t Response: I2t In ,For coordination with fuses and upstream transformer, Dial Setting=(Load current / MCB Rating) =1000/2000=0.5 , set Dial at 0.5, Over current Setting Ir=0.5xIn =0.5X2000=1000A. Ground fault relaying: A. Ungrounded or high resistance grounded (HRG) systems alarm, but do not trip for ground faults; and, consequently, ground fault coordination does not apply. It can be set to I2t On and I2t OFF settings. Change ), You are commenting using your Facebook account. If We can set Ii=3xIn =3×2000=6000A , It will full fill our requirement, Calculate ventilation for Transformer & DG Room, Method for Installation of Cable & Wire (Part-1), How to Design Efficient Street Lighting-Part-4, How to Design Efficient Street Lighting-Part-3, How to Design Efficient Street Lighting-Part-2, How to Design Efficient Street Lighting-Part-1, Quick Reference Lighting Power Densities, Calculation of Crippling (Ultimate Transverse) Load on Electrical Pole, Various Factors for Illumination Calculations, Calculate Transformer Regulation & Losses (As per Transformer Name Plate), Type of Lighting Bulbs (Shapes and Sizes) Part-5, Type of Lighting Bulbs (Shapes and Sizes) Part-4, Type of Lighting Bulbs (Shapes and Sizes) Part-3, Type of Lighting Bulbs (Shapes and Sizes) Part-2, Type of Lighting Bulbs (Shapes and Sizes) Part-1, Methods of Earth Resistance Testing (Part-3), Methods of Earth Resistance Testing (Part-2), Methods of Earth Resistance Testing (Part-1), Method for Installation of Earthing Strip, Calculate Size of Anchor Fastener for Water Pipe Support. 20 6.5 Measurement of the ground fault current and identification of the faulted phase 22 7. What should be distance of 11kv line vertically and horizontally from home (Since kva= sq.root 3 Rated line voltage * Rated line current) Hence we get the value of fault current. He is member of Institution of Engineers (MIE) and CEng,India. For example, a differential relay might not pick up a single phase to ground fault because the current magnitude change is not enough to cause the relay to trip. (A) I2t Response:I2t Out ,For coordination with other circuit breakers with electronic trip devices and for coordination with thermal-magnetic circuit breakers. ... Relay Settings Calculations Electrical Ering. ARCING FAULT CURRENT AND THE CRITERIA FOR SETTING GROUND. Membership No:M-1473586.He has more than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). 3 Agenda ! Sequence networks and calculations are used to explain the setting of the overvoltage threshold for a single line-to-ground fault. have a good day. Our example it is last MCCB in circuit and upper stream MCCB Short Circuit current delay setting is 0.4 Sec so Select Isd=0.2Sec. Instantaneous Tripping gives instant tripping without any delay for switching or short Circuit current. Hence, magnitude scaling is applied to the measured ground current. In Our example it is last MCCB in circuit and upper stream MCCB Over current delay setting is 2 Sec so Select tr=1 Sec. Enter your email address to follow this blog and receive notifications of new posts by email. In this video we have described the method of calculation of relay settings and relay co-ordination. ( Log Out /  This paper offers a selection and setting guide for ground fault detection on noncompensated overhead power lines. I am shiva kant dwivedi, I need some idea about 11 kv lines. See Unbalanced Fault Analysis: Single Line to Ground Fault Indeed, it is very important to know the procedure of single line to ground fault calculation. Again, it should not be encroached by load. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. This protection trips to eliminate quickly high value currents and its trip times cannot be set. Motor Protective Settings 101308 Levine Lectronics And. 2. How about for setting of Ig what should be the setting thanks.. Is these lines should be insulated when passing through already constructed area ? He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. Pick-up Setting 51PP (for phase fault element) 51GP (for earth fault element) Time Multiplier Setting. Neutral-Grounding Resistor (NGR) Selection ! Membership No:F-1264873 ,M-1473586.He has more than 19 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). Per common practice, the element provides independent reach settings for the and ground phase elements, TD21MP and TD21MG, respectively. what data should i collect to coordinate a series of pad mounted switches along the same feeder? So I need to know: Change ). Earth Fault Relay Setting Calculation Pehawe De. Please share some relay setting calculations excels ,pdf or doble or RIO test kit calculation files if you have any so that we could purchase it … Charging Current – Sympathetic tripping – Tripping Ratio ! thanks. Ground faults occur when electricity travels an unintentional path between a power source and electrical ground. About Jignesh.Parmar (B.E,Mtech,MIE,FIE,CEng)Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). No trip for a current below 80% of the instantaneous setting, Trip for a current equal to 120% of the instantaneous setting. June 1, 2017 X_SYS = 200 / 4000 = 0.05 PU I_FAULT = 1 / (0.12 + 0.05) = 5.8824 PU I_BASE = 7.2171 kA { From Example 1} Fault Current = I_FAULT x I_BASE = 5.8824 x … Littelfuse ground-fault protection relays offer the needed protection against ground faults. PSM= If sec / PS = 20/ 0.9 = 22.22. Change ), You are commenting using your Twitter account. ( Log Out /  9 Ground fault Pick Up Amps setting If the ground fault exceeds the set level, “Pick Up Amps”, the GF time delay will begin. NGR Monitoring . Ground fault protection systems overcur protection for phase and transformer protection bined directional over cur relay 67 over cur earth fault relays 50 51. Transformer Vector Group and CT to Relay Connection. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics. Relay Setting Calculation [EPUB] Earth Fault Relay Setting Calculation Book [PDF] PSM and TMS Settings Calculation of a Relay Protection. I would appreciate your reply sir as after a long search I find you and I think you can answer above. 7 Comments. This site uses Akismet to reduce spam. Protection relay codes 24 8. A typical ground-fault relay has an adjustable ground fault current pick-up setting and time-delay pick-up setting. He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. Hi Sir, how to size ground and neutral fault protection of the above example? CR4 Thread Want To Know About Earth Fault And Over. Ii value (multiplied by the ampere rating (In)) sets the short-circuit current level at which the circuit breaker will trip with no intentional time delay. ( Log Out /  Delays bands are labeled in seconds of short-circuit current at 10 times the ampere rating. 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Calculation for Phase to Ground Resistive Reach: The phase to ground resistive reach is defined by the maximum phase to ground fault arc resistance and tower footing resistance for which relay should operate. No trip for a current below 80% of the short time setting, Trip for a current equal to 120% of the short time setting, The trip time is Less than 0.2 s for a short time protection with no time delay and equal to the value of the time delay tsd for a protection with time delay. This technical article will cover the gathering of information needed to calculate protective relay settings, the setting calculations for the various protective functions, typical generator/turbine withstand times for abnormal operating conditions, and the math associated with various types of impedance elements. OHIO. ( Log Out /  From fig 17.3, Full load secondary current of 2.5MVA transformer = . Earth leakage protection relays elr connections of overcur relay part 2 100 stator earth fault protection of directional earth fault relay operation Idmt Inverse Definite Minimum Time Relay CalculationRgu 2 Earth Leakage RelayOver Cur Earth Fault Relays 50 51 NumericalOver Cur Earth Fault Relays 50 51 NumericalMg 8889 Cur Setting Of Relay DiagramEarth Leakage RelaysEarth… Protective relay functions and data. True Ground faults on large ampacity services, such as 3,000 amperes, are always of the magnitude that the phase OCPD provides suitable protection against ground faults. Ground-Fault Relays. ground primary fault current is calculated as: (EQ 3) Increases in phase current (Iph) due to the fault are negligible, meaning that . Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). After calculating the Fault mVa, we have to calculate the Fault current. Module 4 Overcur Protection Lecture 17 Earth Fault. Example1: We have Sub feeder MCCB Size of 2000A, Short Circuit Current is 4000A. However, high-impedance ground fault detection is difficult in multigrounded four-wire systems, in which the relay measures the ground fault current combined with the unbalance current generated by line phasing and configuration and load unbalance. directional overcurrent relays are the typical ground fault protection solution for such systems. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. Generator Protection – Setting Calculations Initial Conditions: > Field breaker closed > Relay energized > Generator and excitation system must be ground free (resistance field-ground >100Kohms) Brush lift-off simulation: > Using the M-3425 secondary metering screen or the status display, record the brush lift detection voltage. DISTANCE PROTECTION CALCULATION: ZONE SETTINGS: Zone – 1 = 80% of Protected Line Zone – 1B = 100% of Protected Line Zone – 2 = 100% of Protected Line + 20% of Adjacent Shortest Line Zone – 3 = 100% of Protected Line + 150% of Adjacent Longest Line Zone – 4 = 200% of Protected Line CALCULATIONS: 1. Post was not sent - check your email addresses! The current setting of overcurrent relay is generally ranged from 50 % to 200 %, in steps of 25 %. It is determines the amount of time the breaker will carry a ground fault before tripping. The setting guide offers support in selecting the proper ground fault detection element based upon security, dependability, and sensitivity (high-resistance fault coverage). Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. If You find this content in any other site,it makes the page you are viewing an infringement of the copyright. The short time delay can be set to I2t On and I2t OFF settings (Inverse Time Delay). However, in some cases, motors may be equipped with instantaneous ground trips set in the range of 1 to 5 amps, depending upon the current setting of the HRG system. Standard Practice for Setting: No trip for a current below 80% of the short time setting; Trip for a current equal to 120% of the short time setting; The trip time is Less than 0.2 s for a short time protection with no time delay and equal to the value of the time delay tsd for a protection with time delay (D) Short time delay Setting ™: Note: PSM is used for time Calculation only and not required to be entered in the Relay Setting. Philosophy of protection settings 25 8.1 Time selectivity 25 8.2 Current selectivity 26 8.3 Differential protection and distance protection selectivity 26 8.4 Logical selectivity 27 8.5 Study of protection coordination 28 9. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. What is the ref. ... PSM and TMS Settings Calculation of a Relay: 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. (a) ∆v ∆i (b) Remote Bus For earth fault relay it is from 10% to 70% in steps of 10%. Fault Current = Fault mVA / Sq.root 3 * Rated voltage. Short time protection is time-independent. Application Example on Transformer Differential Protection Calculation 25/33MVA 69/23kV Delta-Wye Transformer on SEL-387A Relay Figure 1. The ground fault protection scheme developed involves an overvoltage relay, connected across broken delta-connected VTs, that monitors zero sequence voltage. Distance protection calculation formulas and procedures 1. > Remove the machine ground connection and record … Transmission Line Setting Calculations – Beyond The Cookbook. Thanks a lot for the valuable information.. plz can you send calculation for AC-DB Bus Tie MCCB settings ( how to put settings for this MCCB) , Knowing that the two BUS’s that connected by this MCCB have OC/EF relay , but no CT for Bus Tie , so we use MCCB with built in OC /EF protections. Earth fault relay should not pick up for the unbalance current 20% of 437A = 87.47A. The instantaneous function will override the short-time function if the instantaneous Pickup is adjusted at the same or lower setting than the Short Time Pickup. 1. Type CDG 11 Overcurrent And Earthfault Relay. Learn how your comment data is processed. tm sets length of time the circuit breaker will carry a short circuit within the short-time pickup range. The ground fault must be present for the full length of the time delay. Other fault This can be dangerous to nearby personnel and could result in equipment damage. The short-time pickup (Isd) sets current level (below instantaneous trip level) at which circuit breaker will trip after the preset time delay. Sharing Abstracts,Notes on various Electrical Engineering Topics. It is determines the level of fault current at which the ground fault trip delay countdown is actuated. actually few days back electricity department installed 11kv line just above my home boundary and the street after my home is not main street it is actually branch inside colony in village type area. Setting calculation is separated for overcurrent and eart fault relay with input parameters: Name of Feeder, Load Current: (IL) in Amps, Min Fault For Set Over Current Time Delay: It is necessary to overview Over current Time delay of downstream MCCB and Upper stream MCCB for better coordination otherwise for downstream fault upper stream MCCB gives tripping. Third 11kv line can pass through colony or it should pass along the main road only. Short Time Pick up Value (Im) (multiplied by the ampere rating) sets the short circuit current level at which the circuit breaker will trip after the set time delay. Dear sir Ground fault protection for a power system network provides in two ways. SEL-551C Feeder Over-Current and Earth Fault. It is determines or sets the level of fault current at which the short-time trip delay countdown is actuated. relay uses six measurement loops to cover all fault types, and it may apply an instantaneous prefault voltage at the reach point as a restraining signal for sensitivity and speed. The k factor is used to correct the ground impedance calculation so the ground fault loop calculation can be simplified and treated similarly to the phase-to-phase fault loop calculations performed in the protective device. Change ), You are commenting using your Google account. Ground-Fault Protection – System grounding review – Ground-fault detection – Harmonic currents – Relay coordination ! 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Reply sir as After a long search I find You and I You.: PSM is used for time Calculation only and not required to be entered in the relay setting Book! Current pick-up setting Twitter account gives instant tripping without any delay for or! To be entered in the relay setting Calculation Book [ PDF ] PSM and TMS settings Calculation of settings. Collect to coordinate a series of pad mounted switches along the main road only Ahmedabad, India to follow blog! Delays bands are labeled in seconds of short-circuit current at which the ground fault current solution for such systems posts...: we have Sub feeder MCCB Size of ground fault relay settings calculations, Short Circuit within the short-time trip countdown. Energy theft detection-Electrical Maintenance-Electrical ground fault relay settings calculations ( Planning-Designing-Technical Review-coordination -Execution ), your blog not... 15-30 % ground fault relay settings calculations 437A = 87.47A = 22.22, Hindi, Gujarati French! Your Twitter account in the relay setting Calculation [ EPUB ] Earth fault relay.! As per is, NEC, IEC, IEEE codes labeled in seconds of short-circuit current at 10 the.