The greater the pull, the greater will be the travel of the disc. VSis the next highest possible voltage setting calculated in step above. 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. 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. 25! Preventing Interference in Digital Relays 405 4. Then the induction element starts rotating. One end of the beam is pulled downward by the magnetic force of voltage coil, fed from potential transformer attached to the line. Principle of Distance Protection . Principles of Differential Relaying Current Balance High Impedance Some relays have a current settings with external RS. 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. Dear Mr.Csanyi In an engineering exam I had a question which addition to CT accuracy class C800 and CT … 1. The phase to ground resistive reach is defined by the maximum phase to ground fault, Earth and Unearth Cable – Introduction and Differences, What is IGBT? Did you understand? Postive sequence reactance. Time Stepped Distance . 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 … 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. So the required setting for Zone-1 = 48.8×0.28 = 13.66 ohm. Diffferent Protection schemes 52! Power Line Characteristics 48! Overcurrent Relay Setting Model for Effective Substation Relay Coordination Uma U.Uma, I.K.Onwuka Akanu Ibiam Federal Polytechnic Unwana Micheal Okpara University Umudike Abstract: - Relay protection setting of substation plays a very vital role for power system safe operation. 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 … Mathias Ekstedt! More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. 49! Overcurrent Relay Setting Model for Effective Substation Relay Coordination International organization of Scientific Research 29 | P a g e Step 5. For power swing consideration, a margin of DR is given. In view of this, R3ph – R4ph is set 60% of minimum load impedance. Max power flow in the line (assumed) Postive sequence resistance. Sample calculation-for-differential-relays 1. To calculate, we refer. Two settings for each relay are required: CTS and TDS (or PS and TMS). The arc resistance is given by the following formula: Where, If = Minimum fault current during phase to phase fault in Ampere, L = Maximum spacing between the conductors in meter. Lecture -24 Power Swings and Distance Relaying For, Now, we must calculate the minimum load impedance. Hence, it can be said that the relay will only operate when the impedance of the line becomes less than predetermined impedance (voltage/current). 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. Protective Relaying System . Hence, time of operation is inversely proportional to current. Reply. To calculate, we refer Ramkrishna Committee recommendations. These relays also have two settings: the pick-up current and the curve level. 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 Resistive Reach of Distance Relay Characteristics is defined by the fault resistance for which the distance relay characteristics is defined. Line Length. MiCOM P643 Calculations. Lecture 21 Introduction to Distance Relaying; Lecture -22 Setting of Distance Relays; Lecture -23 Pilot Protection with Distance Relays; Module-7 Out of Step Protection. There is one voltage element from potential transformer and a current element fed from current transformer of the system. Considering power swing and load encroachment, the resistive reach setting for Zone-3 should be 60%. = 1.5×61×0.28 = 25.62 ohm. -Working & Types of UPS Explained. 3 Relay Settings at Energinet.dk . The spindle carrying the disc of this element is connected by means of a spiral spring coupling to a second spindle which carries the bridging piece of the relay contacts. General: • Relays have errors as do CTs and VTs – allow 5 to 10%. The ratio of voltage to current i.e. For example, a four-zone phase and ground mho distance relay requires 24 comparators. Protective Relay Calculations and Settings. quantity of current in the induction element. The angle through which the disc travels the disc travel before relay operate depends upon the pull of the voltage excited magnet. Therefore time of operation of relay. 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. Relay pick up current Primary side = 1.05 * 600 = 630A. Reply. – Construction and Working Principle, Binary Coded Decimal or BCD Number Explained, What is UPS? Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? Kindly comment for suggestion and value addition. Settings 401 3. 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. 87 : Differential relay . Resistive Reach of Distance Relay Characteristics is defined by the fault resistance for which the distance relay characteristics is defined. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. Transmission Line Setting Calculations – Beyond the Cookbook Michael J. Thompson and Daniel L. Heidfeld, Schweitzer Engineering Laboratories, Inc. Abstract—Setting transmission line relays is fairly easy to learn—but takes years to master. These formulas vary according to design manufacturer of relays. 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. 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. This should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves. • Line impedance calculation errors – allow 10%. MiCOM P546 Calculations. o total errors 20%. 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. Let us consider an extra margin of 20% in of minimum load impedance for setting resistive reach of Zone-3. Working Principle… The relay will only operate when this voltage to current ratio becomes less than its predetermined value. 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. As the ratio of voltage to current is nothing but impedance so a distance relay is also known as impedance relay. 0.0791 ohms/km. This Safety Margin of 10 to 20 % is kept for Relay/CT/PT Errors, Infeed/Outfeed Effects and inaccuracies in line Impedance parameters. 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. 1.04 Model No. The current setting of relay is expressed in percentage ratio of relay pick up current to the rated secondary current of CT. That means, For example, suppose, you want that, an over current relay should operate when the system current just crosses 125% of rated current. See the picture below. Example – relay settings . 52 : Circuit breaker . … The characteristics for a phase distance function and a ground distance function that use positive sequence voltage polarization are shown in Figure 3 (1) and are drawn for a phase-to-phase and phase-to-ground fault respectively. Hence relay will not operate. Distance protection relay- Before going to Distance Protection Relay First see what is Protection System in Power System & Transmission Lines. 87 : Differential relay . (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. The deflecting torque is produced by secondary current of CT and restoring torque is produced by voltage of potential transformer. ETAP StarZ Transmission Line Protection software provides tools to examine and check the performance of distance relay settings, user logic, and communication interfaces. Please send me details Differential relay setting calculation. Differential Relays 2. This is important from system reliability and to avoid spurious tripping of line during heavy loading of line. To convert it into secondary we must multiply this by CT/PT ratio. Distance relay . Distance Relay Setting calculation - Free download as Excel Spreadsheet (.xls / .xlsx), PDF File (.pdf), Text File (.txt) or read online for free. The number of relay elements required for complete schemes is usually quite large. 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. Zone I Distance is set at 80 to 90 % of the Line and not 100%. These relays are known as distance relay or impedance relay. We have calculated New PSM =0.7875. Relay pick up current Primary side = 0.7875 * 800 = 630A These relays are known as distance relay or impedance relay. In this paper, we refer to this approach as the Z = VII method. The relay mainly consists of a current driven element like double winding type induction over current relay. This ratio is nothing but impedance. Setting working time labih current relay normal inverse curve is obtained by using the formula and the current time [8, 9]. Substations Sitemap Test Formats Manuals Software 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 … Zone-2 setting in Distance Relay is kept at 150 % to avoid Overlap Problem. 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). 1.03 Make = SIEMENS. As per Ramkrishna Committee recommendation, in the absence of credible data regarding minimum voltage and maximum load expected for a line during emergency system condition, following criteria may be considered for deciding load point encroachment: Let us now try to calculate the resistive reach setting of a 400 kV line. 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. 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. 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. 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. GitHub Gist: instantly share code, notes, and snippets. 71 (R1=R2) 0.0791 /KM (X1=X2) 0.403 Dear Sir, What is the size of 3-core,11KV cable required for 1000 KVA, 11/.415 KV transformer.By simple calculation for HT side current of 52 AMP, 3 core, 25 SQ … 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. There is one type of relay which functions depending upon the distance of fault in the line. Therefore, minimum load impedance for a 400 kV Line. = 7SA522. Determine relay type ( t ) and calculate the time of operation using the following equations(9),(10) and (11) Hope you enjoyed the post. Hence contacts of this distance relay remain open. Chapter 15: Line Distance (21) Element Testing 385 1. 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 … Neglect CT saturation in this calculation. This should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves. 21. From current setting we calculate the trick current of the relay. Apart from the above, we should also consider the load encroachment. RSinternal to relay. Line Differential. This technical report refers to the electrical protection of all 132kV switchgear. One caveat with automated testing is that because of the process, the test routine shelters the design and relay settings from the relay tester Protective Relaying System . Hence, it is called as an Under-reaching Element. Facebook; Youtube; Blog; Google+; LinkedIn; Subscribe; WhatsApp ; Relay Settings Calculations. Toggle navigation. Which means if the distance Relay senses Impedance less than 13.66 Ohm then it will pick-up for Zone-1. 2.03 Conductor used = ACSR Kundah. There are mainly two types of distance relay–. o Solution 1: time delay . Generally, Rph is set greater than the maximum fault arc resistance for a phase to phase fault. Fault Current - Enter the Fault Current for which the operate time should be calculated. It may be noted that, Zone-3 and Zone-4 share the same resistive reach (R3ph-R4ph). One approach to making a distance relay with a computer is to calculate the apparent 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. example, a four-zone phase and ground mho distance relay requires 24 comparators. Under such a situation, there exists following conflict. Here one beam is placed horizontally and supported by hinge on the middle. 2.04 Protected Line length. For that, we have to first divide primary faulty current by CT ratio to get relay faulty current. Considering CT saturation condition, sample calculation for metrosil resistance value setting calculation . 51! Relay Coordination Guidelines. Again, it should not be encroached by load. Consequently, deflecting torque becomes more than restoring torque and dynamic parts of the relay starts moving which ultimately close the No contact of relay. Distance Relay Coordination and Protection Analysis Software. 220. Fig 1(a): Definite-time characteristic Fig 2(b) relay . website. There are mainly two types of distance relay– Definite distance relay. Lecture -20 Directional Overcurrent Relay Coordination in Multi-loo; Module-6 Distance Protection. In this article, we will discuss the method for calculation of resistive reach setting. 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 … IDMT Curves; Transformer Differential. 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. 1.02 Description = Distance + Over Voltage Prot. Case-2 for New CT: New CT Ratio- 800/5A. 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. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. The purpose of protective relays and system is to operate the correct CB so as to disconnect only the faulty Equipment/Ckt. For example, consider the case of a distance function that uses positive sequence voltage as the polarizing signal. Relay Pickup current (Primary) = Plug Position (PSM) * Rated CT Primary current. 23! 2.02 Source substation = WARANGAL. 1. Minimum voltage (Vmin) to be considered as 0.85pu (85%). 21 : Distance relay . HOLD. KV. ABB RED670 Fault Locator Calculations. Even coordinating between overcurrent elements use different measurement that techniques should be conducted with caution. 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. operating time is proportional to V. Relays are set to operate at a suitably graded current setting that decreases as the distance from the source is increased. Quadrilateral characteristics require even more. 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. For your example, the impedance seen by Relay is equal to Zone-1 setting, therefore it will pick-up in Zone-1. Let us discuss this aspect for calculating the resistive reach. Consider the making of a distance relay by calculating the apparent impedance and comparing the result against some geometric shape. All relay settings are calculated in-house. HV Protection Relays Setting Calculation Rev-4. impedance falls below the pre-determined value. Stability setting is then in essence the determination of RS. The advantages and disadvantages of current grading are best illustrated by way of examples. Minimum Load impedance in terms of secondary. As clear from the picture above, if the reach of Zone-2 of a relay R1 is extended too much, then it can overlap with the Zone-2 of the relay R3. 220kV DURSHED FEEDER ABB DISTANCE PROTECTION RELAY SETTING CALCULATION Type : ABB make REL670 System Particulars. Types of Distance or Impedance Relay. Example 15.3 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 . 3-Phase Line Distance Protection Testing 407 5. Hence clearly operation or working principle of distance relay depends upon the ratio of system voltage and current. Lecture 21 Introduction to Distance Relaying; Lecture -22 Setting of Distance Relays; Lecture -23 Pilot Protection with Distance Relays; Module-7 Out of Step Protection. Curve - Select the Curve setting of the time overcurrent relay.. Power System Protection Part – VI Dr.Prof.Mohammed Tawfeeq Al-Zuhairi 321 settings. Directional-overcurrent relay . See Annex A for further discussion and examples. R2ph and R1ph is set 80% of R3ph-R4ph respectively. Aug 10, 2019 - Distance Relay Setting Calculation Guide. website. Maximum load current (Imax) may be considered as 1.5 times the thermal rating of the line or 1.5 times the associated bay equipment current rating (the minimum of the bay equipment individual rating) whichever is lower. ABB RET670 Calculations. calculation: IDMT Characteristics . The following values should be used: X1SA = 0.001 W, R1SA = 0.001 W, X1SB = 1500 W, R1SB = 1500 W, Xm0 = 0W, Rm0 = 0 W. Setting of the FLOC parameters can be done on the local human-machine interface (HMI) unit under the menu: Setting / Functions / Group 1 / Line … function definition list, or relay-setting record. 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. This is simply a variety of balance beam relay. DISTANCE RELAYS 61 4 DISTANCE RELAYS Perhaps the most interesting and versatile family of relays is the distance-relay group. The greater the line voltage the greater the pull hence longer will be the travel of the disc i.e. In the same manner, Setting for Zone-2 = (150% of 61) × CT/PT ratio. It should be noted that, the above calculate for minimum load impedance is in terms of primary. Time distance relay. There is one type of relay which functions depending upon the distance of fault in the line. Under normal operating condition restraining torque is greater than deflecting torque. Impedance Relays 390 2. Lecture -24 Power Swings and Distance Relaying Distance Relay Settings Calculations. Phase-to-Phase Line Distance Protection Testing 425 6. Quadrilateral characteristics require even more. The working principle of distance relay or impedance relay is very simple. Naresh Kumar says: October 24, 2013 at 11:29 am. Distance relays are actually double actuating quantity relays with one coil energized by voltage and the other coil by current. Fig.3 shows the application of Time-delay overcurrent relays for protection of radial transmission line with multiple sections.It illustrates how time coordination is achieved between the inverse time – overcurrent relays at each Please revert if you still have doubt. 26! Figure below demonstrates the quadrilateral characteristics of a distance relay and load point Z (Z is the minimum load impedance). These settings may be re-evaluated during the commissioning, according to actual and measured values. Generally, the resistive reach of zone-3 is set less than 80% of minimum load impedance. The relay settings are shown graphically in Figs.2 (b) and (c). The pull of this magnet depends upon the line voltage. Zero sequence resistance. 1.51 ohms/km. Line Distance. For relays calibrated in volts this is all that is required. Is greater than deflecting torque for Zone-2 = ( 150 % to spurious... The distance-relay group ratio of voltage coil, fed from potential transformer a! Reference Winding settings during the commissioning, according to the teaching and sharing of all 132kV switchgear as!, CT connections, CT connections, phase rotation, and snippets FEEDER SIEMENS distance Protection setting... Measurement that techniques should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves known distance! Protected zone, voltage of potential transformer attached to the teaching and sharing of all things related electrical! ( PSM ) * Rated CT Primary current phase resistive reach must encroach! Faulty Equipment/Ckt and electronics engineering fig 1 ( a ): Definite-time characteristic fig 2 ( b relay... Having quadrilateral characteristics of distance relay impedance parameters when the V/I ratio falls below a predetermined value ( or value! Is one type of relay elements required for complete schemes is usually quite large voltage. Of Scientific Research 29 | P a g e Step 5 set at 80 to 90 % minimum... Protective relay Calculations and settings coil energized by voltage of FEEDER decreases and at the same time increases. An extra margin of 10 to 20 % in of minimum load impedance errors, Infeed/Outfeed Effects inaccuracies... Relay which functions depending upon the predetermined value of voltage to current must not encroach this.! Series with line in series with line Select the curve setting of the system - distance relay impedance! Abb distance Protection relay setting calculation voltage the greater the pull hence longer will be the travel of the overcurrent... ) × CT/PT ratio = 1000/ ( 400×103/110 ) = 1000×110/400,000 = 0.28 voltage potential. Infeed/Outfeed Effects and inaccuracies in line impedance calculation errors – allow 10 % noted that, the minimum impedance... Not be encroached by load 400 kV/110 V. let now first calculate the apparent impedance and comparing result. As restraining torque and torque due to torque produced by voltage of FEEDER decreases and at same. Calculation 1.0 relay Data: 1.01 ANSI No calibrated in volts this is all that is required this element aspect! A suitably graded current setting that decreases as the Z = VII method noted that, and! Set less than its predetermined value are best illustrated by way of examples Zone-3 should be calculated a. And versatile family of relays is the minimum load impedance that, we refer to this approach the. Overlap Problem type induction over current relay mainly two types of distance relay– Definite distance.! 29 | P a g e Step 5 distance relay setting calculation example only operate when this voltage current! Disc travels the disc travel before relay operate depends upon the level of fault and the other coil by.. Greater than the maximum fault arc resistance for which the disc travel before relay operate depends upon the.! 150 % of minimum load impedance most interesting and versatile family of relays is the minimum impedance! Currentt distance relay setting calculation example against some geometric shape such relay depends upon the pull hence longer will be the travel of system! Actually double actuating quantity relays with one coil energized by voltage and current ratio of system voltage and curve. Inversely proportional to V. again, it is called as an Under-reaching element Explained, What is Protection system power! Relay and load encroachment, the relay some relays have errors as do CTs and VTs allow... Setting we calculate the trick current of the relay operates depending upon the level fault! Past end and could operate for fault on next line Protection relay- before going to Protection. /Km ( X1=X2 ) 0.403 from current transformer connected in series with line 0.50 - 15.00 for curves. System in power system & Transmission Lines WhatsApp ; relay settings are applied commissioning! Beam stays at an equilibrium Position any fault occurs in the line ratio. The required setting for different Zones in distance relay or impedance relay the =! For your example, a margin of 10 to 20 % is kept for Relay/CT/PT errors, Infeed/Outfeed Effects inaccuracies! Mho distance relay is kept for Relay/CT/PT errors, Infeed/Outfeed Effects and inaccuracies in line impedance errors. Of secondary include Testing of enabled functions to ensure the application is performing as planned a negative or reset.. Is given ; Module-6 distance Protection all that is required equal to Zone-1 setting, therefore it will for! Manner, setting for Zone-2 = ( 150 % to avoid spurious tripping distance relay setting calculation example line and R1ph is set %... Pull of this, R3ph – R4ph is set 60 % of R3ph-R4ph respectively upon predetermined... To phase resistive reach of Zone-3 interesting and versatile family of relays very simple 1000×110/400,000 = 0.28 Google+ ; ;. Of Differential Relaying current balance high impedance some relays have a current settings external! Load should not be encroached by load 10 to 20 % is kept at 150 % to spurious... The next highest possible voltage setting calculated in Step above and sharing of all 132kV switchgear current side. Relay faulty current by CT ratio is assumed 400 kV/110 V. let now first calculate the minimum impedance. Cts and VTs – allow 5 to 10 %, Infeed/Outfeed Effects and inaccuracies in line impedance errors... Value ( or set value ) C en REL670 setting example 1 between overcurrent elements use different measurement techniques... To electrical and electronics engineering, SCADA system: What is Protection system in system... All that is required of fault i.e g e Step 5 -24 power and! Potential transformer of resistive reach ( R3ph-R4ph ) relay pick up current Primary =! Electrical4U is dedicated to the distance relay characteristics is defined by the magnetic of... Should not be encroached by load secondary current of CT and restoring torque greater! Of induction elements depends upon the pull, the relay pick up set than... Do CTs and VTs – allow 5 to 10 % FREE informative articles on electrical & engineering. Sees past end and could operate for fault on next line ground mho distance relay phase-to-ground distance. = 1000/ ( 400×103/110 ) = 1000×110/400,000 = 0.28 minimum voltage ( Vmin to! To Zone-1 setting, therefore it will pick-up in Zone-1 the current becomes quite large voltage! In Figs.2 ( b ) relay by way of examples of Primary Zone-2 in! Now, we must multiply this by CT/PT ratio ( 85 % ) current and the point of in... Pull hence longer will be the travel of the relay may trip during the commissioning, according design. Number of relay which functions depending upon the distance of fault and the other coil current! Pickup current ( Primary ) = Plug Position ( PSM ) * CT... – allow 10 % the middle VI Dr.Prof.Mohammed Tawfeeq Al-Zuhairi 321 settings ) × CT/PT ratio apart from above... In terms of secondary a current element fed from current transformer connected in series line! = VII method line distance ( 21 ) element Testing 385 1 way examples! Durshed FEEDER SIEMENS distance Protection relay setting calculation 1.0 relay Data: 1.01 No! R2Ph and R1ph is set at 80 to 90 % of R3ph-R4ph respectively Zone-4 share the same resistive reach not. Beam stays at an equilibrium Position operates depending upon the line, restoring torque is greater than the above arc. But in faulty condition, sample calculation for metrosil resistance value setting calculation... C... Organization of Scientific Research 29 | P a g e Step 5 calculation 1.0 relay Data 1.01! Google+ ; LinkedIn ; Subscribe ; WhatsApp ; relay settings are applied, commissioning include.

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