0
Negative sequence current is defined as 3I2 = (phase 1)*(1angle 0) + (phase 2)*(1angle 240) + (phase 3)*(1angle 120)
Negative sequence current is seen in three phase power systems due to natural system imbalance. Also during unbalanced fault conditions such as line to line, Line to ground, and line to line to ground faults. It is not seen in purely balanced three phase faults.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Why zero sequence current cannot flow through a star connected machine unless the neutral is grounded?
If the neutral point is not earthed than the zero sequence current will not have any return path.It will be an open circuit for the zero sequence circuit.
What if in 3-phase connection load is not balance in three phases ie RYB?
due to unbalance load 1. Due to negetive phase sequence components in current generator and transformers suppling the load will be over heated 2. The opposite torque on the shaft will damage, rotors are more likely to damage. 3. High current through neutral of the system, normally neutral cable conductor is of lesser size then phase and hence it may be damaged.
What cause current on the neutral line in a three phase?
Current on neutral in a multi phase system is caused by imbalance between the phases. Question: Are you talking about neutral or ground? The two are very different. Although neutral is grounded, it is expected to be a current carrying conductor, so current on neutral is normal, so to speak. Ground, on the other hand is a protective circuit that is not supposed to have any current on it at all.
How do you drop voltage in parallel circuit?
it does not meet,positive goes to positive and negetive to negetive.
What happens if there is no neutral in smps circuit?
No neutral means no current and it doesn't work.
Do neutrons have a negetive charge?
no and they are neutral
Gamma is positive or negetive?
neutral
Why zero sequence current cannot flow through a star connected machine unless the neutral is grounded?
If the neutral point is not earthed than the zero sequence current will not have any return path.It will be an open circuit for the zero sequence circuit.
What if in 3-phase connection load is not balance in three phases ie RYB?
due to unbalance load 1. Due to negetive phase sequence components in current generator and transformers suppling the load will be over heated 2. The opposite torque on the shaft will damage, rotors are more likely to damage. 3. High current through neutral of the system, normally neutral cable conductor is of lesser size then phase and hence it may be damaged.
What happens to a neutral atom that accepts one electron?
The neutral atom then takes on a negative charge because the incoming electron has a negetive charge.
What is mean by Zero phase Current transformer?
at first what is zero sequence current.. Zero sequence currents, in simple terms, are those found in the neutral conductor. They include the unbalanced 50 Hz currents and the 3rd, 9th, 15th and other triplen harmonic currents. Zero sequence currents appear in the neutral because they do not cancel in the way that 50Hz currents cancel. This is due to the fact that the zero sequence component on one phase is always in phase with the zero sequence components of the other 2 phases. we can say 50 Hz current on one phase, on the other hand, is always 120° out of phase with the other phases 50 Hz current which causes their balanced portions to cancel in the neutral. now, any method of ground current sensing involves detecting zero sequence currents. For solidly grounded systems, connecting the phase current transformers together with a common return allows measurement of zero sequence current in the common lead, if there is no neutral load current. The vector sum of the phase currents is equal to the zero sequence ground current. Under normal load conditions, the vector sum of the three phase currents is near zero. It is not exactly zero as the system capacitive charging current of the load circuit is non-zero. but it is limited value..if it is beyond the limit this zero sequence CT take care of it. All phase conductors are passed through the window of a single CT referred to as a zero sequence CT. Under normal circumstances, the three phase currents will sum to zero resulting in an output of zero from the zero sequence CT's secondary. If one of the phases were shorted to ground, the sum of the phase currents would no longer equal zero causing a current to flow in the secondary of the zero sequence CT. This current would be detected by the relay as a ground fault. Regards, Balaji K APL, Ahmedabad
What does a negetive and a negetive make?
It makes a positive.
What direction does direct current flow in?
Curren flow from high potential to low potential or simply, positive pole to negetive pole.
What is negetive 3 minus negetive 2?
negative1
What is neutral variation?
Variation in protein sequence that is not selectively important
What will happen without a neutral wire?
Current needs a return path to earth to flow. The neutral carries this flow. Therefore, no neutral and no current flow.
Difference between ground and neutral?
As i know,neutral is the return path of current & ground is for any leakage current
