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If a motor is connected in star, the current in the motor winding will be equivalent to the line current. If the motor is connected in delta, the current will be 1/sqrt(3) of the line current.
If three phase CTs are connected in Delta, their secondary current will be sqrt(3) higher than the CT ratio implies by the line current.
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Why phase current is equal to line current in star connection?
Because it is the same current, as you can determine by examining a circuit diagram of a star connection.
Why star connection draw low current?
In star each phase is 120 degree apart in delta angle between phases(R,Y,B) are 60 degree so star connection draw low current.
Why the load must be delta connection instead using star connection?
in order to reduce the impact of fault current...
Why star connection used in transmission?
Transmission circuits are prone to earth faults.Only star connection permits flow of earth fault current and the operation of earth fault relays.
What is the star delta working principle?
when starting a 3 phase induction motor,first start with star connection,because reduced current is being applied and after start change it to delta connection then. full line current is applied to the motor.
What is star dalta connection?
star delta connection is used reduce high starting current of the motor. you can see the below diagram if you need anything more details... let me know
Why use star delta gether for motor?
In a large power motor the starting current is too high if connected 'direct on line'. If you start a motor on 'star' connection it uses less current to get it going before the 'delta' connection takes over.
What is the definition of star connection?
The definition of star connection is a connection of the ends of phase windings at the star point.
Why we get the 0 level in trans farmer when we use delta to star connection when you get the 220 volts at each terminals of star connection of transformer how we get 0 level or neutral equals to 0?
A: In the USA there is D delta connection or Y connection. The Y center point may not be zero if there is circulating current due to mismatch of the phases
Why does delta connection have no neutral connection?
Lets compare between a star and delta connection in 3-phase power types. In a star connection, there are 6 connections (A1, B1 and C1 being the outer arms of the 3 armed star and at the centre, A2, B2 and C2). The center is called the neutral or star point which carries out the any unbalanced current loads through its connection. That is why if you lose out the neutral point in a star connection, there will be an overflow of current through to the loads. The loads also take in more current, generating much more power and could damage the appliance you are using and the components the line current is connected to, since excess heat and overworking may result.In a delta connection, the connection has only 3 and on a piece of paper it is sketched as the connections being joined arm to arm. One side is A phase, B phase and C phase. Getting to the point, a Delta connection does not have a earth wire because the live voltage is always the same throughout the connection. Since phase and line voltage are the same and constants. It also means the line current will change without affecting other components within the circuit. Balanced Delta connected circuits or loads can only have their power supply sourced from a star connection and a balanced Star load can only have their voltage supply come from a delta connection.Another AnswerWith a delta connection, the phasor sum of the three line currents is zero, whether the load is balanced or unbalanced, so no neutral is necessary.
Why you make initially star-connection then delta-connection?
This type of motor starting is used to reduce the inrush current to a lower level. Once the motor is operating at the lower level of run current it changes to a delta connection which allows the motor to operate at its full load amperage rating.
How do you convert star delta connection to delta star connection?
hahahaa
