Distance Relay or Impedance Relay Working Principle Types The working principle of distance relay or impedance relay is very simple. There is one voltage element from potential transformer and a current element fed from current transformer of the system. The deflecting torque is produced by secondary current of CT and restoring torque is produced by voltage of potential transformer. Principles and Characteristics of Distance Protection Principles and Characteristics of Distance Protection Principles of Distance Relays. Since the impedance of a transmission line is proportional... Relay performance. Distance relay performance is defined in terms of reach accuracy... Distance Relay Characteristics. Some numerical relays measure ... Fundamental overcurrent, distance and differential ... Distance protection. The basic principle of distance relay is that the apparent impedance seen by the relay, which is defined as the ratio of phase voltage to line current of a transmission line ( Zapp ), reduces drastically in the presence of a line fault. A distance relay compares this ratio with the positive sequence impedance (Z1)... Distance Relays Fundamentals store.gegridsolutions DISTANCE RELAYS FUNDAMENTALS. J. G. Andrichak, G.E. Alexander General Electric Co Malvern, PA. INTRODUCTION. Distance functions have been in use for many years and have progressed from the original electro mechanical types thr ough analog types and now up to digital types of functions. TRANSMISSION LINES DISTANCE RELAY BASICS AND TUTORIALS ... A full complement of relays consists of three phase distance relays and three ground distance relays. This is the preferred protective scheme for high voltage and extra high voltage systems. Pilot Protection As can be seen from Fig. 9.33, step distance protection does not offer instantaneous clearing of faults over 100% of the line segment. Distance Protection Relay Circuit Globe Distance protection relay is the name given to the protection, whose action depends on the distance of the feeding point to the fault. The time of operation of such protection is a function of the ratio of voltage and current, i.e., impedance. This impedance between the relay and the fault depends on the electrical distance between them. Working of Relays How Relay works,Basics,Design ... Relays are simple switches which are operated both electrically and mechanically. Relays consist of an electromagnet and also a set of contacts. The switching mechanism is carried out with the help of the electromagnet. There are also other operating principles for its working. But they differ according to their applications. Cigre Basic Principles of Distance Protection Pangonilo DISTANCE PROTECTION FUNCTIONS AND APPLICATIONS 1 BASIC PRINCIPLES OF DISTANCE PROTECTION DEVICES1 The operating voltage of the lines and equipment protected by distance relays is usually several thousand volts, and the current in the equipment during system faults and disturbances is thousands of amperes. What is Mho Relay? Description & its Operating ... A mho Relay is a high speed relay and is also known as the admittance relay. In this relay operating torque is obtained by the volt amperes element and the controlling element is developed due to the voltage element. Hence this relay is called a voltage controlled directional relay. 11 Distance Protection fecime.org ordination between distance relays on a power system. Basic distance protection will comprise instantaneous directional Zone 1 protection and one or more time delayed zones. Typical reach and time settings for a 3 zone distance protection are shown in Figure 11.6. Digital and numerical distance relays may have up to five zones, Module 6 : Distance Protection Lecture 21 : Introduction ... Therefore, traditionally the distance relays are configured as per equation (7) to detect and locate both L L and 3 phase faults. Therefore, distance to fault is given by where, l is length of line and Z app is the impedance seen by the relay. This is the fundamental principle of distance relaying. 21.3 Earth Fault Protection

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