Protective Relaying System . Zero sequence reactance. ABB RED670 Fault Locator Calculations. This should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves. There is one type of relay which functions depending upon the distance of fault in the line. Minimum Load impedance in terms of secondary. 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. Again, speed of rotation of induction element approximately proportional to current in this element. 52 : Circuit breaker . Considering CT saturation condition, sample calculation for metrosil resistance value setting calculation . Toggle navigation. -Working & Types of UPS Explained. The ratio of voltage to current i.e. Mar 20, 2018. 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. sample relay setting calculation ... 1MRK506267-WEN C en REL670 Setting Example 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. Reply. This should be 0.50 - 15.00 for U.S. curves and 0.05 - 1.00 for IEC curves. The current element produces a positive or pick-up torque while the voltage element produces a negative or reset torque. Thus, the phase to phase resistive reach must be set greater than the above calculated arc resistance. Stability setting is then in essence the determination of RS. 21. Zone-2 setting in Distance Relay is kept at 150 % to avoid Overlap Problem. 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. 1.51 ohms/km. Let us discuss this aspect for calculating the resistive reach. 51! The time distance impedance relay will not only be operated depending upon voltage to current ratio, its operating time also depends upon the value of this ratio. 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. 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. Generally, the resistive reach of zone-3 is set less than 80% of minimum load impedance. CT / PT RATIO : 2. Under normal operating condition restraining torque is greater than deflecting torque. Chapter 15: Line Distance (21) Element Testing 385 1. 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). Power Line Characteristics 48! ETAP StarZ Transmission Line Protection software provides tools to examine and check the performance of distance relay settings, user logic, and communication interfaces. Working Principle… Lecture -24 Power Swings and Distance Relaying 0.403 ohms/km. From current setting we calculate the trick current of the relay. Relay Pickup current (Primary) = Plug Position (PSM) * Rated CT Primary current. Aug 10, 2019 - Distance Relay Setting Calculation Guide. 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. 1. For your example, the impedance seen by Relay is equal to Zone-1 setting, therefore it will pick-up in Zone-1. The relay settings are shown graphically in Figs.2 (b) and (c). 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. 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. Generally, this reach is set 80% of minimum load impedance. The torque due to voltage coil, serves as restraining torque and torque due to current coil, serves as deflecting torque. 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. Protective Relay Calculations and Settings. Impedance Relays 390 2. In this article, we will discuss the method for calculation of resistive reach setting. Under such a situation, there exists following conflict. 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. 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 … Even coordinating between overcurrent elements use different measurement that techniques should be conducted with caution. 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. Sample calculation-for-differential-relays 1. Unit – Differential Protection . Again, it should not be encroached by load. Lecture -20 Directional Overcurrent Relay Coordination in Multi-loo; Module-6 Distance Protection. Two settings for each relay are required: CTS and TDS (or PS and TMS). ABB RED670 Fault Locator Calculations. 1.02 Description = Distance + Over Voltage Prot. 0.0791 ohms/km. 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. 220kV DURSHED FEEDER ABB DISTANCE PROTECTION RELAY SETTING CALCULATION Type : ABB make REL670 System Particulars. 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. Protective Relay Calculations and Settings. MAHMOUD. With reference to recommendation of Ramkrishna committee recommendation. The speed of rotation of induction elements depends upon the level of fault i.e. The purpose of protective relays and system is to operate the correct CB so as to disconnect only the faulty Equipment/Ckt. There are mainly two types of distance relay–. 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 … Ground mho distance relay: Ph-Ph resistive reach are settable in quadrilateral characteristics of a relay. Than the maximum fault arc resistance share the same time currentt increases example 1 calculation! Method for calculation of resistive reach setting serves as deflecting torque of FEEDER decreases and at the time! 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