The sampling and processing of the data is done in the DSP ( Digital signal processor ) in case of numerical IEDs . Numerical Relay Protection Type Feeder Protection Frequency Protection Generator Protection Motor Protection Transformer Protection Distance Protection ... Model Type: -Send Query. diagram of numerical relay. For instance, in some time overcurrent solid state relays, the incoming AC current is first converted into a small signal AC value, then the AC is fed into a rectifier and filter that converts the AC to a DC value proportionate to the AC waveform. The relay may have an extensive collection of settings, beyond what can be entered via front panel knobs and dials, and these settings are transferred to the relay via an interface with a PC (personal computer), and this same PC interface may be used to collect event reports from the relay. It is also called numerical relay. Motor Protection Relays 3. They are functional replacements for electro-mechanical protective relays and may include many protection functions in one unit, as well as providing metering, communication, and self-test functions. 14 Underspeed device functions when the speed of a machine falls below a pre-determined value. A listing of device numbers is found at ANSI Device Numbers. Directional Over Current Relays 6. It is of two types: instantaneous over current (IOC) relay and definite time overcurrent (DTOC) relay. Protection algorithms are a set of logic equations in part designed by the protection engineer, and in part designed by the relay manufacturer. They use one or more digital signal processors (DSP) optimised for real time signal processing, running the mathematical algorithms for the protection functions. One is RAM (Random Access Memory) and ROM (Read Only Memory). Relays detect and locate faults by measuring electrical quantities in the power system which are different during normal and intolerable conditions. Under/Over Voltage Relays 7. If the line current exceeds the safe value, circuit breaker gets triggered. Definite time relay: Activated only if the fault remains until a specific time. Types of Relays The main types of protective relays are summaries in the following diagram: Attracted Armature Solid Computerized State Digital Relays Plunger Type Magnetic Induction Electromagnetic Numerical Relays Magnetic Attraction Others: Temperature Pressure Wattmetric Type Induction Cup Shaded Pole Types of Relay. Video that explains overcurrent protection testing: This page was last edited on 3 January 2021, at 22:16. 18 FUNDAMENTAL RELAY-OPERATING PRINCIPLES AND CHARACTERISTICS Time delay is obtained in induction-type relays by a "drag magnet," which is a permanent magnet arranged so that the relay rotor cuts the flux between the poles of the magnet, as shown in Fig. The event recording would include some means for the user to see the timing of key logic decisions, relay I/O (input/output) changes, and see, in an oscillographic fashion, at least the fundamental component of the incoming analogue parameters. Numerical relay is also a digital system, which is concisely communicating with substation automation. Block diagram of numerical relay. Differential Relays 4. Although they are classified under different conditions their purpose remains the same, to activate the trip system when there is a fault in the electrical network. All rights reserved, What is Numeric Relay - Its Working and Types, STM32F2 Series High-Performance Microcontrollers, STM32F4 Series High-Performance Microcontrollers, STM32F7 Series Very High-Performance Microcontrollers, STM32F0 Entry-Level ARM® Cortex®-M0 Microcontrollers, STM32F1 Series Mainstream Microcontrollers, STM32F3 Series Mixed-Signal Microcontrollers, Digi-Key Becomes Official Raspberry Pi Authorized Distributor and Will Carry the Full Line of Raspberry Pi Products, How does Quality Factor or Q-Factor Impact the Performance of an Inductor. More complex digital relays will have metering and communication Protocol ports, allowing relay! In Transmission lines for network operators, electricity suppliers, and industrial enterprises in every sector the powered... Powered analog signals are stepped down with current transformer and Potential transformer unexpected fault currents approxi-mately! Incoming voltage and current wave-forms are monitored by analog circuits, not or. 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