Questions tagged [star]
The star tag has no usage guidance.
30
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Delta star, beginner question
Hi, can someone tall me why the line comes from behind the motor and comes back in front of it.
Is it because internal connection is crossed? for example, u->x v-y w->z. What am I missing?
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1
vote
1
answer
90
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Why connect a 3-phase alternator's star-point to a rectifier bridge?
I noticed while troubleshooting a Denso alternator that the stator's star point was connected to the rectifier bridge. While probing with a multimeter, I think the schematic looks something like the ...
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votes
2
answers
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Three-phase motor Delta/YY connection diagram and windings troubleshooting
I am trying to troubleshoot this 1.4 kW three-phase motor and I'm unsure how its internal windings are interconnected or whether they are shorted.
On the plate it says "Delta/YY 400 V", and ...
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votes
1
answer
1k
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Why this motor shows delta 220 / star 380 which is usually the other way round from what I know? [closed]
Brand new induction motor arrived in the factory,it comes with gearbox on top controlled by VFD, but I could not understand it's nameplate, it should have shown just delta / star without voltage ...
- 13
1
vote
1
answer
394
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3-phase star transformer connection with no neutral for wind turbine
I built a wind turbine a while back and have been using it to power lights in my house. It gives out 3-phase in star setup with no neutral. Neutral is buried in epoxy resin in the casting.
It feeds ...
- 23
0
votes
2
answers
230
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Multiple ground
In my design I have four different ground:
Ground: from USB for step up and battery charger IC.
Ground1: for a split supply (virtual ground).
Ground2: for the input signal reference.
Ground3: for the ...
- 135
0
votes
4
answers
677
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LTspice error, "Matrix is singular" for 3 phase circuit
I have been searching about it online but all I can find is info about a transformer. Am I missing something?
Here is the circuit:
This is the circuit I am trying to make:
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0
votes
0
answers
39
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Torque developed by Star Connected rotor
The current in each phase of a Y-connected rotor winding is 200 amperes. The resistance per leg is 0.003 ohm. Determine the torque developed by the rotor at a slip of 3%.
I don't understand how to ...
1
vote
1
answer
1k
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How to solve this star delta problem?
Please help me solve this star delta problem:
My attempt:
What to do next to solve this completely?
0
votes
0
answers
179
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Problem figuring star delta starter circuit
I know the basic functioning of star delta motor starter configuration but kind of stuck on my current project which uses old L&T starter panel. I can't figure out the terminals like A1, A2 (coil ...
- 143
0
votes
2
answers
1k
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CAN bus expander circuit
I am trying to design a CAN bus expander. In this case I could implement star topology of multiple buses in parallel. It would avoid having problems with reflections and delay.
For this purpose I ...
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0
answers
44
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Power measurement in star three phase balanced load
I had a doubt, in a balanced star three phase arrangement:
Using two wattmeter method, we obtain power readings as W1 and W2. (which may be unequal).
Let us take W1=5 watt and W2= 6 watt for instance ...
- 11
0
votes
1
answer
749
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Only 3 wires in 3 phase motor terminal box
I have a 3 phase motor with the nameplate below
At the terminal box you have your standard 6 pins labelled u, v, w, u1, v1, w1. However, the u1, v1, w1 is not connected on the terminal block but ...
- 55
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votes
2
answers
542
views
3 pole SSR with Neutral connection
I am designing a heater block using 12 heaters. Each one has 200W/230V ratings.
I have decided to use 3 pole SSR for control heaters with help of PID temperature controller.
The SSR manufacture ...
- 861
0
votes
2
answers
395
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Single-point ground vs multi-point ground - large DC system
So we're working on a DC system with little space for cabling and a size which requires at most 1.5m cable length. We're running power on 48V DC (hence, frequency = 0) with a max of about 5Amps per ...
- 326
0
votes
1
answer
659
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Why delta connections are done when the motor is required to be operated at 220V?
I am working with a tip dresser which is used for dressing the tip of the welding gun. A motor is used in that tip dresser which is used to rotate the cutter to dress the tip. There are two provisions ...
0
votes
3
answers
744
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Star Delta Starter control with Arduino
I don't have any experience with star delta starters but on doing some research I concluded that 2 push buttons (NO and NC) are required to turn on or off the system. I have a pump which is star delta ...
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votes
2
answers
1k
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Delta-Star Combination Exercise
This post is regarding exersise 4-8 from the following book:
Hughes Electrical And Electronics Technology 10th Ed.
Here it is:
Let's focus on what I tried for solving part (b) :
Since this is an ...
- 135
2
votes
2
answers
3k
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Motors Delta/Star connections to VFD
I've selected 230/400V motors (delta/star) and corresponding 400V VFDs for pump motors. Now I've been asked why I haven't selected 400/690V motors (delta/star), that are the standard and usually ...
- 21
1
vote
1
answer
93
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What is the correct way to solve this problem?
I first solved it by converting the two star connected networks into delta networks and further solving them.
Then I solved by considering one star, converted that to delta and then used parallel ...
0
votes
2
answers
278
views
Calculating Phase wise Energy in Three Phase System
In three phase three wire system, is it necessary to calculate phase wise energy?
As per my knowledge, in three phase three wire system we are concerned about only total power/energy.
But does it ...
- 31
0
votes
1
answer
262
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Star to delta transformation circuit
Is it possible to use star-to-delta transformation on this specific circuit below? If it is possible, can someone give me a hint on how to do it?
I tried to do delta-to-star transformation and got the ...
0
votes
4
answers
16k
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Three-phase motor connection, 230 V delta or 400 V star?
I have a motor with these specifications:
star 400 V
delta 230 V
The motor is of course 3-phase.
How can I connect the motor using a delta connection if I have only 400 V line-to-line voltage? Where ...
- 15
2
votes
1
answer
12k
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Why don't the currents clash in a 3 phase delta connection?
Consider 3 windings, a, b and c. L1 is connected to A, L2 to B and L3 to C. The 3 windings are then connected in delta.
If we could freeze frame the voltage waveform where L1 and L2 are positive ...
- 337
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votes
2
answers
480
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Where does the sum current of the three currents flow?
In the following star and delta connections, if each individual current enters via Phases R, Y and B, where does the sum of the three currents (that is Ia+Ib+Ic) flow after meeting at the common point ...
- 849
0
votes
1
answer
2k
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what will happen if the motor that is designed for delta connected in star connection
I have a motor which is designed for 3 phase, 380V. The power rating of motor is 132kw and motor stator winding is connected in delta connection. If I connect the same motor stator winding in star ...
0
votes
0
answers
791
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Grounding the components of a DIY cnc machine
I'm in the process of building a DIY cnc machine. It already runs, but I noticed it has some interference problems (steppers act weird on occasions, the full graphic smart controller LCD has trouble ...
- 147
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0
answers
643
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power planes star connection
I have only one layer for +5V and -5V power lines on pcb. There are about 10 dual supply OPAMPS which get power from Recom RKZ0505D DCDC converter.
As I know, star topology is suitable for this. PCB ...
- 445
0
votes
2
answers
131
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What is the difference between a rupture and the neutral conductor not existing from the start in star three phased system?
I have a pretty basic question.
In three phased systems, I know that if the loads are equal, the neutal conductor has no role and can be removed, my question concerns unequal loads.
My question is, ...
0
votes
1
answer
126
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How can I eliminate the loop in this diagram?
I'm really sorry to open some series of questions but since the issue is complicated I decided to open a separate question for a particular thing for not creating confusion:
There is the red loop in ...
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