Between Star-Delta & Star-Star Power transformer which one
is efficent for Earth Fault?
Answers were Sorted based on User's Feedback
Answer / daher
star/star because in the case of line to earth faults the
zero curret IO in delta connection transformer has no path
to leave the close loop of three phases transformer
Is This Answer Correct ? | 17 Yes | 8 No |
Answer / nidhi
star delta .
because in star star connection solidal grounding should be
provided to ground third harmonics. in star delta whenever
afault will occur then it will circulate only in this delta
not go to the output
Is This Answer Correct ? | 12 Yes | 5 No |
Answer / sunil guru
Star - Star bcz.. it has a point at center which can be
used as a neutral or can be grounded,
but in case of star-delta there is no path for ground
return current during short circuit..an the circulating
current will flow inward itself and can damage the winding..
for any disagreement mail me at parmar20072008@yahoo.com
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / awais
Star star because for earth fault return path is required to complete the circuit so neutral grounded star connection is ideal for such type of fault detection..
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / daher
star/star in case of line to ground short circuit in star -
delta transformer their is no path to I0 short circuit
current and it will turn inside the closed circuit of delta
connection
Is This Answer Correct ? | 1 Yes | 4 No |
Define Current Transformer? Working & TYpe's Of C.T.
Why insulation level follows this order? transformer < bus bar < circuit breaker & Isolator < transmission line.
What is dynamo function in DG sets and draw block diagram?
What is the need of motor starter?
what is the purpose of checking IR and Megger values in motor windings?
Can you explain about TEE protection scheme?
Slip at maximum torque depends on A rotor resistance and reactance B stator reactance C load current D stator resistance
Which capacitor is used in ceiling fans ?
when motor taking high amp what happen.
I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase), before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???
how to find out speed of single phase motor
What is the suitable rating of MCB used for 1.5 Ton A.C & why?