Distance Relay Coordination and Protection Analysis Software. 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. 87 : Differential relay . Curve - Select the Curve setting of the time overcurrent relay.. 45! Aug 10, 2019 - Distance Relay Setting Calculation Guide. 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. 3-Phase Line Distance Protection Testing 407 5. Distance Protection 46! Relay pick up current Primary side = 0.7875 * 800 = 630A Max power flow in the line (assumed) Postive sequence resistance. The greater the pull, the greater will be the travel of the disc. Dear Mr.Csanyi In an engineering exam I had a question which addition to CT accuracy class C800 and CT … 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. Transmission Line Setting Calculations – Beyond the Cookbook ... different quantities, for example, coordinating between distance and overcurrent elements or between dissimilar directional polarization methods. Time Stepped Distance . website. DISTANCE RELAYS 61 4 DISTANCE RELAYS Perhaps the most interesting and versatile family of relays is the distance-relay group. 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. Your feedback will make the article more helpful. If the impedance sensed by relay is more than 13.66 but less than 25.62 (Zone-2 setting), Zone-2 will pick up. calculation: IDMT Characteristics . quantity of current in the induction element. Line Length. 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.) It may be noted that, Zone-3 and Zone-4 share the same resistive reach (R3ph-R4ph). The relay operates only when the V/I ratio falls below a predetermined value (or set value). Then the induction in the induction element increases. KV. Generally, Rph is set greater than the maximum fault arc resistance for a phase to phase fault. Generally, the resistive reach of zone-3 is set less than 80% of minimum load impedance. This Safety Margin of 10 to 20 % is kept for Relay/CT/PT Errors, Infeed/Outfeed Effects and inaccuracies in line Impedance parameters. This delay automatically adjusts its operating time according to the distance of the relay from the fault point. Settings 401 3. CT/PT Ratio = 1000/ (400×103/110) = 1000×110/400,000 = 0.28. 52 : Circuit breaker . example, a four-zone phase and ground mho distance relay requires 24 comparators. These settings may be re-evaluated during the commissioning, according to actual and measured values. 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Relay pick up current Primary side = 1.05 * 600 = 630A the apparent impedance and the..., 2013 at 11:29 am situation, there exists following conflict mainly consists of a current settings with RS... What is UPS are shown graphically in Figs.2 ( b ) relay Protection relay first see What UPS!