Protective Relay Calculations and Settings. This should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves. Hence, time of operation is inversely proportional to current. Distance Relay Settings Calculations. The number of relay elements required for complete schemes is usually quite large. Reply. The pull of this magnet depends upon the line voltage. Minimum voltage (Vmin) to be considered as 0.85pu (85%). Relay pick up current Primary side = 1.05 * 600 = 630A. Protective Relaying System . Time Stepped Distance . The greater the pull, the greater will be the travel of the disc. One end of the beam is pulled downward by the magnetic force of voltage coil, fed from potential transformer attached to the line. GitHub Gist: instantly share code, notes, and snippets. Benefits of Distance Protection . This simply means that, our resistive reach must not encroach the load else the relay may trip during the high loading of line. As the rotation of the disc proceeds, the spiral spring coupling is wound up till the tension of the spring is sufficient to pull the armature away from the pole face of the voltage excited magnet. PCS has extensive experience in the development of protective relay settings for transmission, distribution and generation systems, with voltage ranging from 480V through 500 kV. Preventing Interference in Digital Relays 405 4. 2.04 Protected Line length. Max power flow in the line (assumed) Postive sequence resistance. Power System Protection Part – VI Dr.Prof.Mohammed Tawfeeq Al-Zuhairi 321 settings. Zone-2 setting in Distance Relay is kept at 150 % to avoid Overlap Problem. For example, consider the case of a distance function that uses positive sequence voltage as the polarizing signal. Zone I Distance is set at 80 to 90 % of the Line and not 100%. During normal operating condition the attraction force of armature fed from PT is more than force generated by induction element, hence relay contacts remain in open position when a short circuit fault occurs in the transmission line, the current in the induction element increases. This delay automatically adjusts its operating time according to the distance of the relay from the fault point. These relays may sometimes be set based in percentages of the line impedances, for example a typical setting for zone 1 is 80% of the impedance of the line in order to not reach the remote end, the zone 2 can be set at 120% of the impedance of the line in order to dependably overreach the line, Zone 3 sometimes are disabled or set to cover an adjacent line. When any fault occurs in the feeder, under protected zone, voltage of feeder decreases and at the same time currentt increases. we respect your privacy and take protecting it seriously, Two types of Resistive Reach are settable in quadrilateral characteristics of, Ph-Ph (Phase to Phase) Resistive Reach, and, Apart from the above, we should also consider the, Generally, the resistive reach of zone-3 is set less than 80% of minimum load impedance. Here one beam is placed horizontally and supported by hinge on the middle. All relay settings are calculated in-house. 49! The current element produces a positive or pick-up torque while the voltage element produces a negative or reset torque. Case-2 for New CT: New CT Ratio- 800/5A. 2.0 Input Data: 2.01 System voltage. We have calculated New PSM =0.7875. See Annex A for further discussion and examples. These formulas vary according to design manufacturer of relays. 51! Once the in-service settings are applied, commissioning should include testing of enabled functions to ensure the application is performing as planned. Two types of Resistive Reach are settable in quadrilateral characteristics of distance relay: Ph-Ph resistive reach i.e. Now, we must calculate the minimum load impedance. Minimum Load impedance in terms of secondary. For your example, the impedance seen by Relay is equal to Zone-1 setting, therefore it will pick-up in Zone-1. Zero sequence resistance. So the required setting for Zone-1 = 48.8×0.28 = 13.66 ohm. In this paper, we refer to this approach as the Z = VII method. In normal operating condition, restoring torque is more than deflecting torque. The follow-ing events trigger calculation of the settings: Replacement of a relay in a station Changes in network topology (cable replac-ing overhead lines) Routine test Changes to operating scenarios 1. Which means if the distance Relay senses Impedance less than 13.66 Ohm then it will pick-up for Zone-1. In MHO type distance relay the major drawback is that resistive reach is defined by the impedance reach and line angle and hence it is not independently settable in the relay. 71 (R1=R2) 0.0791 /KM (X1=X2) 0.403 Dear Mr.Csanyi In an engineering exam I had a question which addition to CT accuracy class C800 and CT … MiCOM P643 Calculations. PCS has extensive experience in the development of protective relay settings for transmission, distribution and generation systems, with voltage ranging from 480V through 500 kV. Curve - Select the Curve setting of the time overcurrent relay.. A B C relay A Reach relay C reach relay B reach D This Safety Margin of 10 to 20 % is kept for Relay/CT/PT Errors, Infeed/Outfeed Effects and inaccuracies in line Impedance parameters. The Line CT ratio is assumed 1000/1 A and CVT ratio is assumed 400 kV/110 V. Let now first calculate the minimum load impedance. Substations Sitemap Test Formats Manuals Software Generally, Rph is set greater than the maximum fault arc resistance for a phase to phase fault. Kindly comment for suggestion and value addition. o Solution 1: time delay . 220. 2 : Model setting calculations -Line 1-149 3 : Model setting calculations-Transformer 1-132 4 : Model setting calculations- Shunt Reactor 1-120 5 : Model setting calculations- Busbar 1-15 6 : Relay setting guide lines for transmission lines 1-19 7 : Recommendations for protection system management 1-5 More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. Calculations : Calculation of relay operating time: In order to calculate the actual relay operating A) Time / PSM Curve B) Plug Setting C) Time Setting D) Fault Current E) Current Transformer Ratio The procedure for calculating the actual relay operating time is as follows:- A) Convert the fault current into the relay coil current by using the current transformer ratio. There are mainly two types of distance relay– Definite distance relay. Again, speed of rotation of induction element approximately proportional to current in this element. Let us discuss this aspect for calculating the resistive reach. See the picture below. 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. The greater the line voltage the greater the pull hence longer will be the travel of the disc i.e. Other end of the beam is pulled downward by the magnetic force of current coil fed from current transformer connected in series with line. operating time is proportional to V. There is one voltage element from potential transformer and a current element fed from current transformer of the system. As phase to phase resistive reach has to cover the maximum fault resistance, therefore, Rph must be set greater than the maximum fault resistance for a phase to phase fault. Therefore, minimum load impedance for a 400 kV Line. Thus, the phase to phase resistive reach must be set greater than the above calculated arc resistance. VSis the next highest possible voltage setting calculated in step above. Generally, this reach is set 80% of minimum load impedance. Lecture -20 Directional Overcurrent Relay Coordination in Multi-loo; Module-6 Distance Protection. 21 : Distance relay . Directional-overcurrent relay . Naresh Kumar says: October 24, 2013 at 11:29 am. CT / PT RATIO : 2. Rph is defined by the maximum amount of fault resistance in addition to line impedance for which distance zone will trip regardless of location fault. Even coordinating between overcurrent elements use different measurement that techniques should be conducted with caution. 1.04 Model No. = 1.5×61×0.28 = 25.62 ohm. It may be noted that, Zone-3 and Zone-4 share the same resistive reach (R3ph-R4ph). This is important from system reliability and to avoid spurious tripping of line during heavy loading of line. Hope you enjoyed the post. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. Lecture -20 Directional Overcurrent Relay Coordination in Multi-loo; Module-6 Distance Protection. 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. Understanding Distance Protection & distance protection relay Why Distance Protection > Since the impedance of a transmission line is proportional to its length, for distance measurement it is appropriate to use a relay capable of measuring the impedance of a line up to a predetermined point (the reach point). Resistive Reach of Distance Relay Characteristics is defined by the fault resistance for which the distance relay characteristics is defined. KV. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. These relays are known as distance relay or impedance relay. WnCTC Settings ReadMe Transformer Phase Transformer + CT Phase W1CTC = W2CTC = Degrees W3CTC = W4CTC = Winding 1 Winding 2 CT 1 CT 2 Winding 3 CT3 CT4 Winding 4 Reference Winding Then click START. In view of this, R3ph – R4ph is set 60% of minimum load impedance. Figure below demonstrates the quadrilateral characteristics of a distance relay and load point Z (Z is the minimum load impedance). 3-Phase Line Distance Protection Testing 407 5. For, Now, we must calculate the minimum load impedance. Hence, it is called as an Under-reaching Element. Distance Relay Setting calculation Electrical Impedance Distance Relay Setting Calculation Guide Line protection calculations and setting guidelines for Power System Protection With Relay Co Ordination Relay Settings Calculations – Electrical Engineering MODEL SETTING CALCULATIONS FOR TYPICAL IEDs LINE Power System Protective Relays Principles amp Practices SECTION 15 POWER SYSTEM … Commentdocument.getElementById("comment").setAttribute( "id", "af825a94d3f8b5884425d8129c2f402a" );document.getElementById("fcfd6eeaff").setAttribute( "id", "comment" ); Subscribe to our mailing list and get interesting stuff and updates to your email inbox. 3 Relay Settings at Energinet.dk . Line Length. Line Distance. As the ratio of voltage to current is nothing but impedance so a distance relay is also known as impedance relay. 26! Considering power swing and load encroachment, the resistive reach setting for Zone-3 should be 60%. Say current setting of the relay is 150 % therefore pick up current of the relay is 1 × 150% = 1.5 A. Step-3 Now we have to calculate PSM for the specified faulty current level. calculation: IDMT Characteristics . = 7SA522. Principles of Differential Relaying Current Balance High Impedance Some relays have a current settings with external RS. In step distance schemes, zones 1 and 2 may have an independent set of distance elements or they may have a sing le set of el ements with reach settings th at … 1. Mar 20, 2018. The relay settings are shown graphically in Figs.2 (b) and (c). The torque due to voltage coil, serves as restraining torque and torque due to current coil, serves as deflecting torque. Protective Relaying System . Then the induction in the induction element increases. These relays also have two settings: the pick-up current and the curve level. 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. Chapter 15: Line Distance (21) Element Testing 385 1. Line Differential. This technical report refers to the electrical protection of all 132kV switchgear. Quadrilateral characteristics require even more. R2ph and R1ph is set 80% of R3ph-R4ph respectively. 220kV DURSHED FEEDER SIEMENS DISTANCE PROTECTION RELAY SETTING CALCULATION 1.0 Relay Data: 1.01 ANSI No. 2.02 Source substation = WARANGAL. One approach to making a distance relay with a computer is to calculate the apparent Support Relay Testing Spreadsheets Acceptance tests are normally performed when a relay is received, prior to in-service settings be­ing applied. In MHO type distance relay the major drawback is that resistive reach is defined by the impedance reach and line angle and hence it is not independently settable in the relay. This should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves. Click the appropriate Winding connections, CT connections, Phase Rotation, and Reference Winding settings. 220kV DURSHED FEEDER ABB DISTANCE PROTECTION RELAY SETTING CALCULATION Type : ABB make REL670 System Particulars. CT/PT Ratio = 1000/ (400×103/110) = 1000×110/400,000 = 0.28. Sample calculation-for-differential-relays 1. Overcurrent Relay Setting Model for Effective Substation Relay Coordination International organization of Scientific Research 29 | P a g e Step 5. Types of Distance or Impedance Relay. Neglect CT saturation in this calculation. These relays may sometimes be set based in percentages of the line impedances, for example a typical setting for zone 1 is 80% of the impedance of the line in order to not reach the remote end, the zone 2 can be set at 120% of the impedance of the line in order to dependably overreach the line, Zone 3 sometimes are disabled or set to cover an adjacent line. Diffferent Protection schemes 52! Impedance Relays 390 2. MiCOM P546 Calculations. Relays are set to operate at a suitably graded current setting that decreases as the distance from the source is increased. The deflecting torque is produced by secondary current of CT and restoring torque is produced by voltage of potential transformer. For example, full element testing of an SEL 311L relay could take up to 12 hours to manually test while the same test can take 4 hours by using an automated software. This is simply a variety of balance beam relay. 21. 47! • Line impedance calculation errors – allow 10%. 25! These settings may be re-evaluated during the commissioning, according to actual and measured values. To calculate, we refer. function definition list, or relay-setting record. Relay Pickup current (Primary) = Plug Position (PSM) * Rated CT Primary current. Distance Relay Setting and Apparent Impedance Calculation for 3- Phase and L-G Fault In Long Transmission Line Jayachandra S1, Vijayasanthi M2 1 Department of EEE/Y.I.T.S, Tirupati, A.P ,517507, India 2 Department of CSE/ S.V.C.E, Sri perambadur, T.N,602105 , India Abstract EHV long transmission transmits large power.it is very important to clear any fault occurred in the transmission line. Fault Current - Enter the Fault Current for which the operate time should be calculated. -Working & Types of UPS Explained. In the same manner, Setting for Zone-2 = (150% of 61) × CT/PT ratio. Under normal operating condition restraining torque is greater than deflecting torque. Phase-to-Ground Line Distance Protection Testing 451 The working principle of distance relay or impedance relay is very simple. 52 : Circuit breaker . In this situation, current coil pulls the beam more strongly than voltage coil, hence beam tilts to close the relay contacts and consequently the circuit breaker associated with this impedance relay will trip. As Zone-2 phase to phase resistive reach is 80% of R3PP, therefore, Similarly, Zone-1 phase to phase resistive reach is 80% of R2PP, therefore. For example, a four-zone phase and ground mho distance relay requires 24 comparators. Staged-Fault Testing of Distance Protection Relay Settings J. Havelka1, R ... and 5 show the relay settings calculated using CAPE software, for the relays at TPP Plomin, SS Sijana and SS Vincent, respectively. Reply. Curve - Select the Curve setting of the time overcurrent relay.. Calculation of IDMT Over Current Relay Settings (50/51/50N/51N) Calculation model for thermal relay Siemens 7SJ64; Motor Protection Relay Selection Curves; Over-current protection – INVERSE TIME O/C PROTECTION CALC – 51(N) – Directional OC – Primary & secondary current calculation; Filter Design Calculation Did you understand? That means. Calculation of Distance Protection Settings in Mutually Coupled Transmission Lines: A Comparative Analysis José de Jesús Jaramillo Serna and Jesús M. López-Lezama * Departamento de Ingeniería Eléctrica, Facultad de Ingeniería, Universidad de Antioquia, calle 70 No 52-21, Medellín 050010, Colombia; jose.jaramillos@udea.edu.co (J.d.J.J.S.) The bridge is normally held in the open position by an armature held against the pole face of an electromagnet excited by the voltage of the circuit to be protected. The definition itself means that phase-phase resistive reach must be defined Zone-1 (R1ph), Zone-2 (R2ph), Zone-3 (R3ph-R4ph) and Zone-4 (R3ph-R4ph). Distance Relay Coordination and Protection Analysis Software. Distance protection relay- Before going to Distance Protection Relay First see what is Protection System in Power System & Transmission Lines. With reference to recommendation of Ramkrishna committee recommendation. To calculate, we refer Ramkrishna Committee recommendations. There is one type of relay which functions depending upon the distance of fault in the line. Distance relays are actually double actuating quantity relays with one coil energized by voltage and the other coil by current. Hence clearly operation or working principle of distance relay depends upon the ratio of system voltage and current. • To ensure whole line covered set to 120% but sees past end and could operate for fault on next line. Resistive Reach of Distance Relay Characteristics is defined by the fault resistance for which the distance relay characteristics is defined. impedance falls below the pre-determined value. Settings 401 3. 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 … 2.1 Differential Relay Settings Calculations MiCOM P63X Relay Type: MICOM P63X Required Data Ratings of the Power and Current Transformers MVA Voltage Ratio Rated Voltage in kV (HV Side) Rated Voltage in kV (LV Side) Vector Group CT Ratio (HV Side) CT HV Side Vector Group CT Ratio (LV Side) CT LV Side Vector Group … Your feedback will make the article more helpful. ABB RED670 Fault Locator Calculations. ETAP StarZ Transmission Line Protection software provides tools to examine and check the performance of distance relay settings, user logic, and communication interfaces. Aug 10, 2019 - Distance Relay Setting Calculation Guide. Pickup - Enter the pickup setting of the time overcurrent relay in primary amps.. Time Dial - Enter the Time Dial setting of the time overcurrent relay. In the preceding chapter, we examined relays in which one current was balanced against another current, and we saw that the operating characteristic could be expressed as a ratio of the two currents. HV Protection Relays Setting Calculation Rev-4. o total errors 20%. CAN U PL GIVE EXAMPLE OF IDMT RELAY SETTING CALCULATION FOR 132/33 KV 25 MVA TF WITH ONE I/C & 3 FEEDERS OF 200 A EACH WITH RELAY SELECTION CURVE. Relay Coordination Guidelines. 24! 45! MAHMOUD. website. Fault Current - Enter the Fault Current for which the operate time should be calculated. Hence, it can be said that the relay will only operate when the impedance of the line becomes less than predetermined impedance (voltage/current). Therefore, the minimum load impedance in terms of secondary. The operation of such relay depends upon the predetermined value of voltage to current ratio. Determine relay type ( t ) and calculate the time of operation using the following equations(9),(10) and (11) There are different impedance setting for different Zones in Distance Relay. Figure 2 shows an example of a radial system with current grading. DISTANCE RELAYS 61 4 DISTANCE RELAYS Perhaps the most interesting and versatile family of relays is the distance-relay group. Please send me details Differential relay setting calculation. Hence relay will not operate. (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. General: • Relays have errors as do CTs and VTs – allow 5 to 10%. Consequently, deflecting torque becomes more than restoring torque and dynamic parts of the relay starts moving which ultimately close the No contact of relay. Please revert if you still have doubt. HOLD. Working Principle… Rated line voltage. In this article, we will discuss the method for calculation of resistive reach setting. Operation is inversely proportional to V. again, it is essential that load should not the... Refer to this approach as the distance relay characteristics is defined by the magnetic force of current coil from. Overlap Problem - 15.00 for U.S. curves and 0.05 - 1.00 for IEC.! Positive or pick-up torque while the voltage element produces a negative or reset torque techniques! The correct CB so as to disconnect only the faulty Equipment/Ckt to get relay faulty.... Lecture -24 power Swings and distance Relaying Protective relay Calculations and settings, under protected zone, of. Rel670 system Particulars above, we should also consider the load encroachment nothing but impedance a... Be set greater than the maximum fault arc resistance for a phase to phase resistive i.e. Going to distance Protection Testing 451 zone I distance is set 80 % of minimum load impedance in terms secondary. Aug 10, 2019 - distance relay ratio falls below a predetermined value of voltage coil, fed potential... Covered set to 120 % but sees past end and could operate for on! Becomes quite large whereas voltage becomes less than 13.66 but less than 80 % of minimum load impedance impedance! Case-2 for New CT Ratio- 800/5A calculate for minimum load impedance aspect for the. Select the curve setting of the system Zone-4 share the same distance relay setting calculation example reach are settable in characteristics! Ct ratio to get relay faulty current by CT ratio to get relay faulty current distance Definite... In volts this is all that is required Part – VI Dr.Prof.Mohammed Tawfeeq Al-Zuhairi 321 settings trip the... Impedance between the point of fault in the line ( assumed ) Postive sequence resistance kV/110 V. let now calculate. Is greater than the above, we refer to this approach as the ratio of voltage current... Faulty condition, restoring torque is produced by voltage and current P a e... Definite distance relay is kept for Relay/CT/PT errors, Infeed/Outfeed Effects and inaccuracies in line impedance calculation errors allow! Not 100 % relay which functions depending upon the pull hence longer will be the travel the! Of relays relay may trip during the commissioning, according to actual and measured values Step 5 Coordination... Ph-Ph resistive reach of Zone-3 is set 60 % of minimum load impedance simply a variety balance! The other coil by current code, distance relay setting calculation example, and Reference Winding settings is... ; WhatsApp ; relay settings are applied, commissioning should include Testing of enabled to... For which the operate time should be calculated lecture -20 Directional overcurrent relay Coordination Multi-loo... Generally, Rph is set 80 % of R3ph-R4ph respectively power flow in the line ( b and. This voltage to current Youtube ; Blog ; Google+ ; LinkedIn ; Subscribe ; WhatsApp relay... Line voltage VII method a negative or reset torque it into secondary we must calculate the trick of! Relay will only operate when this voltage to current ratio have two settings: the pick-up current and the where. Simply a variety of balance beam relay load should not encroach the load else relay! Decreases as the Z = VII method -24 power Swings and distance Relaying Protective relay Calculations and settings are impedance. Minimum load impedance proportional to current an extra margin of DR is given should include Testing of enabled to. The correct CB so as to disconnect only the faulty Equipment/Ckt operates only when the V/I falls! Greater the pull of this, R3ph – R4ph is set 80 % of minimum load impedance a... Excited magnet voltage to current ratio becomes less than 13.66 but less its. Zone-2 = ( 150 % of minimum load impedance ) one beam is pulled downward by the fault for... Approximately proportional to V. again, it should be noted that, the relay will operate! Have two settings: the pick-up current and the other coil by current setting... In Step above which functions depending upon the predetermined value: October,! Working principle of distance relay characteristics is defined by the fault current - Enter the point! /Km ( X1=X2 ) 0.403 from current transformer of the beam is pulled downward by fault! Stays at an equilibrium Position is nothing but impedance so a distance relay with a is! This is simply a variety of balance beam relay currentt increases curve setting of the i.e. ( a ): Definite-time characteristic fig 2 ( b ) and ( C.... Set at 80 to 90 % of minimum load impedance for a 400 line... For, now, we must multiply this by CT/PT ratio line voltage Google+ ; LinkedIn ; Subscribe WhatsApp! Current - Enter the fault point operate the correct CB so as to disconnect distance relay setting calculation example the faulty Equipment/Ckt the where. Travel before relay operate depends upon the impedance between the point of fault and the where! Positive or pick-up torque while the voltage element from potential transformer attached to the teaching and sharing all! Have a current element fed from current transformer of the voltage element from potential transformer attached the... Is proportional to current fig 1 ( a ): Definite-time characteristic 2! So the required setting for Zone-3 should be calculated calculation 1.0 relay Data: 1.01 ANSI No line (... Ct ratio is assumed 400 kV/110 V. let now first calculate the trick current of the line voltage the the. Occurs in the line is pulled downward by the magnetic force of current grading are illustrated! The point where relay is more than deflecting torque is greater than deflecting torque 0.85pu! Of system voltage and current are different impedance setting for Zone-1 = 48.8×0.28 = ohm. Relay- before going to distance Protection relay- before going to distance Protection Testing 451 zone distance. Set at 80 to 90 % of R3ph-R4ph respectively making a distance relay requires 24 comparators the required setting Zone-2. Is it technical report refers to the teaching and sharing of all 132kV switchgear technical report refers to the voltage... Of this, R3ph – R4ph is set 80 % of the time overcurrent relay load,! Independently settable in modern Numerical relay having quadrilateral characteristics of a current element produces a negative or torque... Setting in distance relay requires 24 comparators, setting for Zone-3 should be %!, notes, and snippets V. again, speed of rotation of induction element proportional! Set 80 % of minimum load impedance -24 power Swings and distance Relaying Protective relay Calculations and.. Impedance in terms of Primary CT Ratio- 800/5A operation is inversely proportional to current ratio becomes less 80... Operate the correct CB so as to disconnect only the faulty Equipment/Ckt and versatile family of relays, restoring is... Point where relay is also known as distance relay or impedance relay is more than deflecting.. Relay will only operate when this voltage to current in this article, must. Dr.Prof.Mohammed Tawfeeq Al-Zuhairi 321 settings hence clearly operation or working principle of distance relay by calculating the apparent impedance comparing... Advantages and disadvantages of current coil, fed from current setting that decreases as the ratio of system voltage current! Feeder ABB distance Protection Testing 451 zone I distance is set less than %. Which functions depending upon the level of fault and the curve setting of the time relay! So as to disconnect only the faulty Equipment/Ckt trip during the commissioning, according to manufacturer! The curve setting of the system element like double Winding type induction over current.!: line distance ( 21 ) element Testing 385 1 are applied, commissioning should include Testing enabled! Enter your email below to receive FREE informative articles on electrical & engineering. Fault point according to design manufacturer of relays is the distance-relay group restraining torque and due... Ensure the application is performing as planned paper, we must multiply this by ratio. Comparing the result against some geometric shape current becomes quite large whereas voltage becomes less usually quite large voltage! Vi Dr.Prof.Mohammed Tawfeeq Al-Zuhairi 321 settings the time overcurrent relay reach setting for Zone-3 should noted! Ct Primary current of enabled functions to ensure the application is performing as planned or. Are best illustrated by way of examples these settings may be noted,. /Km ( X1=X2 ) 0.403 from current setting we calculate the trick current of the disc the. Settings with external RS Manuals Software there are mainly two types of resistive reach setting at! Settings: the pick-up current and the point where relay is more than deflecting is.: line distance Protection relay setting calculation 1.0 relay Data: 1.01 ANSI No a. There is one voltage element produces a negative or reset torque mainly two types of resistive reach of relay. For metrosil resistance value setting calculation type distance relay setting calculation example ABB make REL670 system.. Settings: the pick-up current and the point of fault i.e ( 400×103/110 ) Plug! Setting for Zone-1 applied, commissioning should include Testing of enabled functions to ensure line. To phase resistive reach must be set greater than the above calculated arc.! At 11:29 am Infeed/Outfeed Effects and inaccuracies in line impedance calculation errors – 5... Decimal or BCD number Explained, What is it an example of a distance setting! Manufacturer of relays is the minimum load impedance point of fault in the line and not 100 %,! As the distance of fault and the point where relay is more than 13.66 ohm then it will in! Plug Position ( PSM ) * Rated CT Primary current 600 = 630A Test Formats Manuals there! Resistive reach must be set greater than deflecting torque is greater than the above calculated arc resistance a! First see What is UPS source is increased mainly two types of resistive reach must encroach... Magnetic force of current grading are best illustrated by way of examples and!