What is meant by 5p20:10VA? ... A block diagram of a distance relay based on current comparison principle is given in Fig. Where it is used? 44. 48. It incorporates the latest developments in semiconductor technology and its applications to power system protection. Depending on the time of operation the overcurrent relay is categorized into following types. SBC223B 4.22. 50 Instantaneous Overcurrent Relays. Staticrelays Components of static relays Block diagram of static relays Types of static relays Prepared By Mr.K.Jawahar, M.E., Assistant Professor Department of EEE Static Relays Kongunadunadu College of Engineering and Technology Depar tment of EEE What are the advantage and disadvantage of static relay? Draw the block diagram of a static relay? Phase instantaneous overcurrent ... Introduction The SBC is the general designation of a family of static breaker backup relays that provide phase and ground backup protection if the primary circuit breaker fails to clear a system fault. The secondaries of line C.Ts are connected to tie summation circuit. should not be opened? Microprocessor Based Over Current Relay. FIG. The block schematic diagram of the static instantaneous Overcurrent relay is shown in the figure. 46. Each relay includes ... SBC221A functional block diagram Fig. 2. Why the secondary of a C.T. The output of summation C.T is given to the input C.T. Static relays are contrasted with electromechanical relays, which use moving parts to create a switching action.Both types of relay control electrical circuits through a switch that is open or closed depending upon an electrical input. Draw the block diagram of a basic static distance relay? Static relay 1. The starting element is usually an overcurrent relay. Current is taken from C.T. 50. 3a and 3b are waveform plots of the input signals applied to and the output signals resulting from the function generator used in the relay shown in FIG. 45. This D.C. voltage is proportional to load current only. The output is given to the measuring element. 2 is a schematic circuit diagram of a "very inverse" time-overcurrent relay embodying a first form of the invention. and given to I to V converter because many electronics circuit require voltage signal for operation. Static time current relay is nothing but instantaneous overcurrent relay. 47. The overcurrent relay is defined as the relay, which operates only when the value of the current is greater than the relay setting time. FIGS. The A.C. voltage is converted into D.C. voltage by using rectifier. Fig: 1 Block diagram of time current static relay . The current derived from the CT is fed to the input transformer which gives a proportional output voltage. New developments in commercial relay manufacture are also included. It protects the equipment of the power system from the fault current. 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