# In which fault the maximum short circuit current occurs?

In which fault the maximum short circuit current occurs?

In three phase bolted fault the maximum short circuit occurs.

## Related questions

Description : If the % reactance upto the fault point is 20%, then the short circuit current will be

Last Answer : If the % reactance upto the fault point is 20%, then the short circuit current will be 5 times the full load current

Last Answer : Reactance relay is preferred for phase fault on short transmission line.

Description : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)  (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents

Last Answer : The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole) has d -axis current only

Description : If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be

Last Answer : If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be 10

Last Answer : The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.

Last Answer : The short circuit in any winding of the transformer is the result of impulse voltage.

Description : If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400:5, the plug setting multiplier will be

Last Answer : If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400:5, the plug setting multiplier will be 10 A

Description : Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.

Description : Describe the difference between an open circuit and a short circuit.

Last Answer : Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

Description : Which of the following are known as the short circuit parameters of a 2- port network? (A) Z- parameters. (B) H- parameters. (C) Y- parameters. (D) A,B,C,D, parameters.

Last Answer : Which of the following are known as the short circuit parameters of a 2- port network? (A) Z- parameters. (B) H- parameters. (C) Y- parameters. (D) A,B,C,D, parameters.

Last Answer : Short circuit test on transformers is conducted to determine copper losses.

Description : What can cause a short circuit?

Last Answer : Low voltage side is short circuited.

Last Answer : Primary is high voltage side and Secondary is low Voltage side.

Last Answer : In short circuit test of transformer the low voltage side is short circuited . On high voltage side the voltmeter is connected in parallel and ammeter in series and also a wattmeter is ... circuit test is done for determining impedance and losses. In this test iron losses is neglected.

Last Answer : In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

Description : For a transformer, operating at constant load current, maximum efficiency will occur at?

Last Answer : For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.

Description : State maximum power transfer theorem for DC circuit.

Last Answer : Maximum power transfer theorem for DC circuit: The maximum power transfer theorem states that the source or a network transfers maximum power to load only when the load resistance is equal ... removed (disconnected) ii) All internal independent sources are replaced by their internal resistances.

Description : What is the maximum number of circuit breakers in a panel?

Last Answer : It depends on that which type of panel is this.

Description : With fault clearing time, the transient stability of a power system

Last Answer : With fault clearing time, the transient stability of a power system decreases

Description : To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ?

Last Answer : To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ? Δ-Δ connection

Last Answer : Fault diverters are basically fast switches.

Description : Which is the most common type of fault?

Last Answer : Single phase to ground fault is the most common type of fault.

Description : If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then  (A) zero sequence currents are present on both sides of the transformer  (B) ... side  (D) zero sequence currents are present on the primary side but not on the secondary side

Last Answer : If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then zero sequence currents are absent on both sides of the transformer

Description : In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

Last Answer : In the induction type directional over current relay, when a short-circuit occurs in the circuit power flows in reverse direction

Description : Explain why potential difference is necessary to produce current in a circuit.

Description : In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero

Last Answer : In a series R-C circuit, with the increase in frequency, current Increases

Description : In parallel RLC resonance circuit at resonance the current will be  (1) Minimum (2) Maximum (3) Zero (4) Infinite

Last Answer : In parallel RLC resonance circuit at resonance the current will be Minimum

Description : In a series RLC high Q circuit, the current peaks at a frequency  (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency

Last Answer : In a series RLC high Q circuit, the current peaks at a frequency equal to the resonant frequency

Description : When one leg of parallel circuit is opened out the total current will?

Last Answer : When one leg of parallel circuit is opened out the total current will decrease.

Description : Electric current passing through the circuit produces?

Last Answer : Electric current passing through the circuit produces thermal effect.

Description : Magnitude of current at resonance in R-L-C circuit?

Last Answer : The current will be maximum if it is a series rlc circuit.

Description : In a loss-free R-L-C circuit the transient current is?

Last Answer : In a loss-free R-L-C circuit the transient current is sinusoidal.

Description : What is the direction of flow of electric current in an electric circuit?

Last Answer : It  flows  from  anode  to  cathode  (direction  of   holes  flow)

Description : Refer to the circuit below. The total absorbed (consumed) power is:

Description : Give the causes and impact and reasons of grid system fault.

Last Answer : Following are the causes/reasons grid system fault: 1. Major imbalance between generation and consumption i.e. demand is more than generation. 2. Low frequency, due to some faults the frequency ... of supply and causes inconvenience to people. 6. Disturb the routine work of common all people.

Description : A shunt fault is characterized by (A) Increase in current, frequency and pf (B) Increase in current, reduction in frequency and pf (C) Increase in current and frequency, reduction in pf (D) Decrease in current and frequency