Star Delta Starter क्या होता है और कैसे काम करता है power Wiring k द्वारा सीखे Electrical Technician

Introduction to Star-Delta motor starter Most induction motors are started directly on line, but when very large motors are started that way, they cause a disturbance of voltage on the supply lines due to large starting current surges. To limit the starting current surge, large induction motors are started at reduced voltage and then have full supply voltage reconnected when they run up to near rotated speed. Two methods used for reduction of starting voltage are: Star delta starting and Auto transformer starting. Working Principle of Star-Delta Starter This is the reduced voltage starting method. Voltage reduction during star-delta starting is achieved by physically reconfiguring the motor windings as illustrated in the figure below. During starting the motor windings are connected in star configuration and this reduces the voltage across each winding 3. This also reduces the torque by a factor of three. Scheme – Working Principle of Star-Delta Starter After a period of time the winding are reconfigured as delta and the motor runs normally. Star/Delta starters are probably the most common reduced voltage starters. They are used in an attempt to reduce the start current applied to the motor during start as a means of reducing the disturbances and interference on the electrical supply. The Star/Delta starter is manufactured from three contactors, a timer and a thermal overload. The contactors are smaller than the single contactor used in a Direct on Line starter as they are controlling winding currents only. The currents through the winding are 1/root 3 (58%) of the current in the line.during run, often referred to as the main contractor and the delta contactor. These are AC3 rated at 58% of the current rating of the motor. The third contactor is the star contactor and that only carries star current while the motor is connected in star. The current in star is one third of the current in delta, so this contactor can be AC3 rated at one third (33%) of the motor rating. Star-delta Starter Consists following units 1. Contactors (Main, star and delta contactors) 3 No’s (For Open State Starter) or 4 No’s (Close Transient Starter). 2. Time relay (pull-in delayed) 1 No. Three-pole thermal overcurrent release 1 No. 3. Fuse elements or automatic cut-outs for the main circuit 3 Nos. Fuse element or automatic cut-out for the control circuit 1No. Air circuit breaker maintenance /watch/8V41sr-4Qz441 THREE PHASE MOTOR run on SINGLE PHASE supply /watch/YbKrP-WTlM5Tr Auto Change Over Switch /watch/wuIE13bHqWEHE DOL STARTER Practically Explained /watch/4RjPrkc__dp_P STAR DELTA STARTER best explain practical video /watch/Y1luQLVU-tdUu MCB TRIP Indication Circuit /watch/QAJYQhCaB_IaY Reverse Forward STARTER /watch/k7GWmpUiWsRiW How to set Time in On delay Timer and Off delay Timer /watch/w87lk18A2PUAl Tube light Wiring /watch/EdNBWBwf30ifB Tube light Wiring Animation /watch/I4a1Lxf2b3Y21 How to check ON DELAY TIMER and OFF DELAY TIMER /watch/AAF5f7S3ZdB35 Power Wiring of STAR DELTA STARTER /watch/cM5mEgy9zF59m LIGHT BRIGHTNESS CONTROL by Fan Regulator /watch/AmCwroS39kC3w How to make Flickr /watch/k9Xyt5HrTF4ry Water level Control by RELAY AND Contactor /watch/E2WFX4L-4AC-F How limit switch work /watch/0pOiHUAgRSkgi What is FLOAT SWITCH /watch/0pOiHUAgRSkgi How FLOAT SWITCH work /watch/kIduHqOctdocu Electrical IMPORTANT QUESTIONS ANSWER /watch/MUPfYxu1RhN1f How to Read mcb date writen on it /watch/sq_bGEZqjpAqb How to use multimeter /watch/s_eGdWQTkJzTG Full form of CIRCUIT BREAKERS /watch/8nMm-shMYM0Mm Stair case Wiring /watch/YsL8-xJyzwqy8 RCCB / ELCB Trip indication /watch/I-E8GtIez5Je8 5 way to do TWO WAY SWITCH WIRING /watch/0CprBKj5-AB5r How to connect 2 lamp in Series and parellal by just one switch /watch/gHXmzgTIgIsIm Electrical Panel name Full form /watch/cRdj3TyutTTuj voltage value in LT HT MT EHT /watch/Y8lgUmOCjdrCg How to Choose Right MCB /watch/M7VXI9KkpmBkX BUCHHOLZ RELAY /watch/ow72GHQiIdJi2 DOL STARTER WITH POWER AND CONTROL WIRING /watch/0Ve8a_it56zt8 Indication Lamp connection in DOL STARTER /watch/gPEceRUBaRUBc MOTION SENSOR WIRING /watch/YnZJ96FsQr3sJ 20 KW BULB /watch/cJohrXhzCnGzh DOL And STAR DELTA STARTER /watch/gH4DsATlguolD ISOLATION OF 132 Kv Line /watch/kO2HrXOT5RJTH DOL STARTER CONTROL WIRING /watch/s_Yf1ryCDU7Cf Cable size , gland size and circuit breaker Rating/watch/oQMSGjiNcMyNS What is Star delta starter explained /watch/oYKdeYkUok8Ud ELECTRIC SHOCK EFFECT /watch/8mA15PKCfGcC1 100+ Electrical Symbol /watch/g6Yf986C-EPCf HPMV LAMP Connection /watch/IDd1_A27OB571 Videos by Electrical Te

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