Input processing. Advantages of Static Relay. The distinction between digital and numerical relay rests on points of fine technical detail. Numerical method is the best method to design relay due to following advantages: ISSN: 2319-8753 International Journal of Innovative Research in Science, Engineering and Technology Advantages of Numerical relays: Compact Size: Electromechanical Relay makes use of mechanical comparison devices, which cause the main reason for the bulky size of relays. The Advantages of Electromechanical relays are-They are quick acting and can be reset fast. The definition is: Activating the contact unit using electromagnetic attraction, which is produced when electric current exceeding the specified value flows to the electromagnet; the voltage and current (input signal) applied to the coil opens or shuts the contact. This implies that Reactance Relay is an over-current Relay with directional Restraint. 2) Flexibility: We can modify its functional operation by changing codes in software. This creates difficulty in primary-backup coordination activity. Numerical Relay Advantages & Impact on Scheme Design Integration of a suite of Protection & Control functions. 1 Programmability of Numerical Relays: A Busbar Protection Relay Serves as a Traditional RTU Casper Labuschagne, Schweitzer Engineering Laboratories, Inc., Pullman, WA, USA Izak van der Merwe, Eskom Resources and Strategy Division, Cape Town, South Africa Abstract -- Numerical relays have revolutionized protection, control, metering, and communication in power systems. Being current sensing, they are to be selected according to motor rating and are available for practically all ranges of motors. The advantages of numerical protection devices are in terms of protection, reliability, and trouble shooting and fault information. This property of multitasking is further strengthened on the account that the numerical system can accommodate different types of relay characteristics. It requires less wiring so it is not having complex architecture. The reset time of the relay is very less. Exporter of Numerical Relays - Numerical Relays - MiCOM C264-P, Numerical Relays - MiCOMho P446, P443 and P445, Numerical Relays - Bitronics 70 Series Measurement System and Numerical Relays - P991 Test Block offered by Fidere Engineers & Services Pvt. advantages over the other relays such as reduced size, reduced number of protection elements, reduced cost, increased speed etc. monophoto. It uses a flag system for the indication purpose whether the relay has been activated or not. Numerical Relays working explained in this post with the help of a Numerical relay used in industrial applications. -controller Current SamplingB CA E AC - DC Conversion Output Control Steady state data Relay Contacts Crystal Micro Controller Based (Late 80s) 3. Voltage Balance Differential Relay 36. In some cases where the kW rating of LT motor is more (generally more than 75 kW), CTMM or Numerical Relays are used. Self-check feature improves the protection system reliability. Each product replaces several discrete relays. iv ACKNOWLEDGEMENTS The author expresses his gratitude and appreciation for Dr. M. S. Sachdev and Dr. T. S. Sidhu for their supervision of this work. It uses a flag system for the indication purpose whether the relay has been activated or not. Voltage Balance Differential Relay Under normal healthy condition, the two voltages e1 and e2 are same ,so the difference between them is zero. Answer Save. The first numerical relays were released in 1985. This necessitated providing adequate automatic protection for transformer against possible faults. And the simulation results show the advantages of the proposed method in reducing the time needed by the relay to clear the electrical fault. While Numerical Relay … TMS320F2812 is a high performance processor which is … Their advice and assistance in the preparation of this thesis are thankfully acknowledged. Ltd., Kolkata, West Bengal. However, with fuses it is difficult to control the time to trip. numerical relay is implemented and its performance is examined. numerical relay models respond satisfactorily according with the expected results of the tests. ADVANTAGES OF NUMERICAL RELAYS 1) Compact Size: Numerical relay is compact in size, and uses LCD to indicate relay activation. 15.1 Fundamental Principle of Overcurrent Relay 15.1.1Limitations of a Fuse Advantage of fuse based protection is its simplicity and cheapness. Electro Mechanical v/s Numerical Relay 1. Download full … Electromechanical, have been gradually been replaced by Static and then by Numerical Relays. NUMERICAL RELAY TESTING AND VALIDATION IN RELAY LIFE CYCLE. Advantages of Numerical relays: Compact Size Flexibility Multi Function Capability Different types of relay characteristics Digital communication capabilities Modular frame Sensitivity Speed Fast Resetting Data History (1)Nature of fault, (2) Magnitude of fault level, (3) Breaker problem, (4) C.T. Numerical relays are all microprocessor based, but there are relays that take the advantage of microprocessor technology and are not fully numerical. December 2018; Conference: CIGRE Paris Session 2018 ; Authors: Sanjay Patki. A digital protective relay may also be called a "numeric protective relay". Dave Kamin. A numerical relay has got several advantages as compared to ordinary electromagnetic relays. It is rarely found in areas other than Protection. Multiple relay characteristics The range of operation of traditional models is narrow while numerical relays are diverse and evolution adaptable. Electromechanical and static relays have fixed wiring and the setting is manual. what are the advantages of numerical protective relay when compared with other types? Numerical three phase over current and earth fault Relay Type NI 40/41 Application The NI 40 / 41 Feeder Protection Relay is ABB's new and advanced solution for cost-efficient feeder protection relay. A relay comprises of an electromagnet and a contact unit. Advantages of Numerical relays 1. Compact Size . 35. 1 decade ago. However, Electromechanical Relays are still being used. Numerical relays are based on the use of microprocessors. NUMERICAL RELAY CHARACTERISTICS 2.1 General Characteristics Num erical relays are highly co mpact devices, characterised with fast operation, high sensitivity, self monitoring, and low maintenance. However, in LT motors, above five protections are used differently. Siemens SIPROTEC series have been used as an example of numerical relays, specifically 7SJ64 as OC relay, which exists in the ETAP library. -controller Current SamplingB CA E Direct AC Sampling Output Control … The model of the system is simulated using MATLAB/Simulink. The directional element is so designed to give Maximum Torque Angle (MTA/RCA) of 90 degree. The advantage of this relay is that it is less likely to operate inaccurately than a differentially connected over current relay when a short circuit occurs external to the protected zone. The values can be easily set. It is also called numerical relay. With their unique advantages they eliminate use of a thermal/bimetal relay for motor protection. The advantages are - - because the basic hardware is shared between multiple functions, the cost of individual protection functions can be reduced significantly. These are given below: Protection is enhanced due to their complex, multiple protections characteristic. It provides medium and low voltage networks with an optimized composition of protection functions within one relay. on a numerical relay which is composed of rms current converter, integrator, comparator, low-pass filter and reset logic. The overcurrent relay is built using numerical relay technology such that the processor used in the relay is a DSP. Also, once a fuse melts, unless it is replaced, the equipment cannot be energized again. They are reliable. These days, numerical relays are preferred over CTMM relays due to various advantages offered by Numerical Relays. A DSP from Texas Instruments, TMS320F2812 is chosen to build the overcurrent relay according to inverse definite minimum time (IDMT) characteristics. The static relay consumes very less power because of which the burden on the measuring instruments decreases and their accuracy increases. Relevance. The following are the benefits of static relays. They are simple in construction. A Numerical Protection Relay Solution 4 Simultaneous Sampling Requirements In most NPRs, the phase relationship between the signals captured from different channels is as important as the value of the signal. Numerical relays are all microprocessor based, but there are relays that take the advantage of microprocessor technology and are not fully numerical. Putting K2 = 0, K4 = 0 and Ƭ = 90° we get the Torque in Reactance Relay as. A big difference between conventional electromechanical and static relays is how the relays are wired. Numerical relay is the relay in which the measured AC quantities are sequentially sampled and converted into numerical data that is mathematically and/or logically processed to make trip decisions. No special programming device is required. I But by combining many features into one piece of hardware, numerical relay centres on the issues of reliability and availability. Lv 7. 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