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39 Threads found on Star Delta
i am making a star delta starter for my 15 HP submersible water pump set. the contractor coil voltage is 440v AC but i have relay of coil 12v and contact 250v 10 amps rating only, can i us this relay 250v 10a contact to switch 440v 1a contactor coil it is safe, are kindly give me a better solution.
Use wye-delta transformer as isolation transformer, delta connected to inverter, wye as output with star point (neutral). Or connect wye parallel to inverter and use the star point as neutral. delta winding must be present and acts as a stabilizing winding. In the latter circuit, the transformer carries (...)
Another possible method is sequential network restructuring by star-delta and delta-star transformation, particularly easy for equal resistors (not in the present case). For transformation forumulas, see:
You mentioned star/delta starting so you don't use a VFD. The RPM is determined by the mains frequency, number of poles and the load (assuming an induction motor). If you did not change anything there must be increased load or a malfunction in the motor. When RPM reduces significantly, the motor current would increase (more then (...)
Dear Folks, What is the formula to calculate Power consumption on each phase for a 3 phase motor with respect to Hp, when connected as mentioned below. 1. Direct On-Line 2. star - delta Thanking you, Ravi Kumar Gangumolu.
Soft starter application seems only reasonable when a slower motor start than with star/delta is wanted and feasible. The large acceleration time of 80 sec in star/delta makes me doubt that a soft starter with sufficient start time will be avaibale at all. A (...)
Doubt in star delta Here is the confusion. The fig shows star and delta network 85800 It says that P + Q= A || (B+C) Here we consider the resistor R is in open circuited and with that assumption we calculate the equivalent resistance... what if i connect a complex network to the resistor R so that it is not open a
Motors that can be wired for star/delta are multi voltage motors such as 230/415V. If the motor has fixed start OR deltas wiring then they are fixed voltage eg. 415V. Frank
actually, i want to know what type of motor control are you using......? DOL or star delta. here k1 means contactor coil supply. i am just giving an idea how it is,Although it is working ok..............
I've been given an EP-3959E-C3 board from a motor drive. FUS2, a 2A fuse, opened while starting. Perhaps this is happening when it switches star to delta? It is apparently a large motor so that is an assumption. I'm unable to find any information on these and will be looking at the rest of the machine soon in an attempt to find what (...)
What is the coil voltage of the contactors wired up in star-delta? The easiest way would be to control the star-delta controller with relays driven by the microcontroller through a signal mosfet. (You can drive them directly with high side switches if the contactor coils are 24V or less).
Hello experts; I need to choose a transformer for a three phase bridge rectifier with 110Vdc and 50A average DC current at out put. Can anybody plz guide how to calculate transformer secondary voltage and current for this system. And also plz which configuration of transformer should be used. I mean delta-star or (...)
How to get the datasheet & speed vs. load characteristics of the SIEMENS motor ? SIEMENS 3-Mot. 1LG0166-4AA7 0-Z EFF2 LMH 1007/800004378567 IP55 160L IM 132 kg B3 BRG DE 6309-2RZ C3 50 Hz 380/660V delta / Y (star) 15 KW 30.1 A / 17.4 A EFF. 90.0 % COS(PHI) 0.84
The U,V and W windings must be simply connected to a pair of terminals each; a terminal for each end of each winding. No interconnections should be made between the windings as this must be done by the star-delta changeover contactor (starter).
you can use neutral if you need and phase to null line voltage will be 220V,but usually 3phase loads doesn't need neutral line for operation, because the zero potential is created at the joint point of delta or star connection at the load side. also i must say that the equality of neutral and earth depends on the selection of earthing system of ne
@Chuckey I don't think you know enough about motors to be able to bring this project to a safe and successful conclusion. I agree with your point of view. I am just concern that running in delta mode may draw more current from the line and over loads the transformer. Running in star would cause it to overheat in the
it means we use star delta configuration to reduce the starting current to 67% ...... that's the huge advantage of it and huge disadvantage is the low starting torque of the motor which causes late run up (or to take lot of time to reach the motor to its rated torque & speed) .... Am i right ? tell me more about dual
If I saw L1, L2, L3, and GND I would expect 3 phase delta. L1, L2, L3 ,N1 and GND is likely 3 phase star. L1, L2 for 2 phase. N1 implies a power return. GND may conduct power if it is alone, or it is likely just for safety if it accompanies N1. Note there are some 3 phase systems with one corner grounded, so it could only have L1, L2, and GN
I have a 10KW delta power input for motor drive. However , apart from 5kw motor ,I wish to derive 230VAC with neutral for running my other appliances from a single phase supply which reqiuire a neutral. I do not wish to put a heavy/bulky transformer as there is a space limitation. Could my colleagues suggest methods ?
Three phase motors are inherently self-starting because of the rotating filed produced by the 3 phase current. . If the load is balanced, there is no neutral current flow (in the case of a Y (Wye, star) connection. . In a delta connection, you can lose (open) one phase, and you still have three phase power available, although thecurrent (...)
Hi, I have designed a series L-C filter to filter out 5th Harmonic. The specifications are as follows:- 1) 25 kVAr Single phase 525V Capacitor - 3 number 2) 1.55 mH/47A Series Inductor - 3 number 3) Resonant frequency - around 239 Hz The above combination will be a star combination. Each 25 kVAr sing
and in case of resistors network Assume : 1:R4,R1,R2 in delta combination and change it in star , (your R4,R1,R2 will be 1/3 in star if all R's are consider equal and value 1-ohm ). 2:in this way Rt=(R4 + (R1+R5) || (R2+R3) ); :roll:
I use my electric 1 phase to power 2200 VA, 220 V voltage and frequency of 50 Hz. then I want to use a 3 phase motor with voltage 220/380 V, frequency 50 Hz, delta star rated current, current of 30 A Usually, different current rating are specified for star and delta configuaration of the motor. But in any case, the (...)
People used an ohmmeter in older days. There are two concurrent specifications: winding resistance and something like connection or terminal resistance. With a three terminal motor, you can measure only the latter directly, the winding resistance (star or delta circuit has to be calculated).
Hi I m facing with the main controller unit of industrial UPS that giving worng signal and detect same warning to UPS(total 5 unit). UPS envirnment is oil rig. Input is coming from gen set 690 ph ph 60 hz source. Power analyzer proved input is no problem. But input is delta 3 wires + ground. All the unit are using del-star neutral ground
I need a program to run on a SIEMENS LOGO PLC to control a HYDRAULIC PRESS with all safety and if possible with redundancy. P.S. Hydraulic pump motor start must be star/delta. Regards, Fernando
help to get circuit for automatic control of load i.e if the load decrease below 50% it should change to star automaticaly. and if load increases it should change again to delta. using any controller
just convert the upper loop (Triangle) delta to Y (star) connection then it can be solved very easily.
star and delta connection used in ground plates and in motors.... the main advantage of star connection of a star point which can be used to carry away excess carriers safely to ground....
change the star to delta total capacitance = 6c sorry =2c not 6c
Probably is the characteristics of the socket for mains connection: - 3W = 3 wire connection ( tri-phase system ) N = neutral wire PE = Protective earth ( ground ) 220/380 - 230/400 - 240/415 V = viltages star-delta connection ( first star connection ) depending on the nominal voltage of the country where the system is installed (...)
You need 3 relays, use microcontroller to configure relays as star connection or delta connection and use microcontroller build in timer to adjust time delay between star to delta conncetion.
I assume you need to convert star to delta and vice versa... The program in link do this and a lot
Come on, make an effort and do a web-search on "star+delta" .. There is hips of information that will keep you busy for hours .. For example: "star delta starT UP PRINCIPLES" Regards, IanP
changing delta connected power sourse to star connected sorce will change the generated voltage and increase it by root 3 this is because the line voltage in star connection is a vector summation of two phases each phase is equal the output of the delta voltage. to keep same voltages it requires to change windings (...)
What's the power of your motor. If it's larger then 10kW (depends on your line voltage and power capabilities) you should consider a star-delta configuration for start up. Otherwise check your motor for faults.
i want to know if there are documents about the standard schematics of some panels like DOL,star-delta,VFD,MCC, MDB, and others and how we do calculations for these connections?
I need 3-phase water pump control schematic (with star-delta start) for building use. Anybody can hekp please.