What will the torque equation of an induction-type directional relay be if one flux is direct...
What will the torque equation of an induction-type directional relay be if one flux is direct current and the other is alternating current?
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What will the torque equation of an induction-type directional
relay be if one flux is direct...
Q1. A poly phase directional relay, each element of which develops maximum torque when the current...
Q1. A poly phase directional relay, each element of which develops maximum torque when the current in its current coil leads the voltage across its voltage coil by 30°. By drawing phasor dia grams, show how the total electrical torque can be calculated. Assuming that the relay constant K, is 3.0, calculate the total elecetrical torque for the connection if the system currents and voltages as applied to the relay are: IA 40+j10; IB-20 -j25; Ic 5 j10 60 +j0:...
Assume a directional relay that calculates and compares zero sequence current (lo, operate quantity), with zero...
Assume a directional relay that calculates and compares zero sequence current (lo, operate quantity), with zero sequence voltage (-3Vo, polarizing quantity). The relay operates with maximum torque when lo lags -3 Vo (negative 3 Vo) by 65 degrees, which indicates a forward fault: (12 points) Calculate the polarizing and operating quantities from the following phase quantities VB N-1152-118° kv Ve N=119 1170 kV .A 23202-36° A Assume the VT ratio is 1400/1, and the CT ratio is 400/1. The relay...
Are current and flux in the same direction in induction? What is their relationship with emf?
Are current and flux in the same direction in induction? What is their relationship with emf?
Q10. Based simply on the concept of rotor induction, explain what happens as the rotor approached...
Q10. Based simply on the concept of rotor induction, explain what happens as the rotor approached synchronous speed and why the rotor, practically, will always be slower than synchronous speed. What causes the rotor mmf? How must the rotor move with respect to the stator magnetic field in order to have a rotor mmf? What happens to torque as the rotor mmf (rotor flux density) decreases?
Q10. Based simply on the concept of rotor induction, explain what happens as the...
Question2 A5: Explain self and mutual induction Magnede Two coils, coil1 and coil2 are placed...
Question2 A5: Explain self and mutual induction Magnede Two coils, coil1 and coil2 are placed next to each other. Coil1 is connected to an alternating voltage V which supplies a changing current in coil 1 (i) Draw the diagram (i) Explain Induced emf by self inductance and label the diagram and (iii) Explain Induced emf by mutual inductance and label the same diagram (1,2,2 marks) Question3 B3: Explain mmf and list equations that links it to other factors (i)...
Magnetic Induction 1. You have two loops of wire that are parallel to each other (one...
Magnetic Induction 1. You have two loops of wire that are parallel to each other (one of top of the other). What direction is the current in the upper loop when the lower loop a) Has no current passing through it. b) Right when 3A of direct current is turned on to the loop c) Some time later and the current is still flowing. d) Right when the current is turned off.
A three phase induction motor draws a starting current which is five times the full load...
A three phase induction motor draws a starting current which is five times the full load current with direct on line starting, while developing twice the full load torque. Q2.1. Based on the two facts that starting current is proportional to the applied voltage and that the starting torque is proportional to the square of the applied voltage, determine voltage (as a per cent of rated voltage) required to obtain a starting torque equalling the full load torque. (10 marks)...
One application of electromagnetism is an electrical switch called a “relay.” These are used in many...
One application of electromagnetism is an electrical switch
called a “relay.” These are used in many different kinds of systems
that require a high power signal or circuit to be controlled by a
small signal, or that require the control circuit to be completely
electrically isolated from the controlled circuit. The long-range
“action at a distance” magnetic force provides a solution to these
issues. The diagram below left shows one possible relay geometry.
This would allow, for example, high voltage...
C) What is the magnetic induction (B) in air 0.0800 m from a long straight wire...
C) What is the magnetic induction (B) in air 0.0800 m from a long straight wire carrying a current of 14.0 A? I: 14 D) What is the magnetic field strength (B) in the center of a coil of wire in air with one turn (a loop) with a radius of 0.110 m and a current of 0.420 A? E) What is the magnetic flux density (B) in the center of a solenoid in air with a length 0.140 m...
What type of Selection? Number of cacti A. Artificial B. Directional C. Stabilizing D. Disruptive 70...
What type of Selection? Number of cacti A. Artificial B. Directional C. Stabilizing D. Disruptive 70 80 90 100 110 120 130 Number of spines
Q1. A poly phase directional relay, each element of which develops maximum torque when the current in its current coil leads the voltage across its voltage coil by 30°. By drawing phasor dia grams, show how the total electrical torque can be calculated. Assuming that the relay constant K, is 3.0, calculate the total elecetrical torque for the connection if the system currents and voltages as applied to the relay are: IA 40+j10; IB-20 -j25; Ic 5 j10 60 +j0:...
Assume a directional relay that calculates and compares zero sequence current (lo, operate quantity), with zero sequence voltage (-3Vo, polarizing quantity). The relay operates with maximum torque when lo lags -3 Vo (negative 3 Vo) by 65 degrees, which indicates a forward fault: (12 points) Calculate the polarizing and operating quantities from the following phase quantities VB N-1152-118° kv Ve N=119 1170 kV .A 23202-36° A Assume the VT ratio is 1400/1, and the CT ratio is 400/1. The relay...
Q10. Based simply on the concept of rotor induction, explain what happens as the rotor approached synchronous speed and why the rotor, practically, will always be slower than synchronous speed. What causes the rotor mmf? How must the rotor move with respect to the stator magnetic field in order to have a rotor mmf? What happens to torque as the rotor mmf (rotor flux density) decreases?
Q10. Based simply on the concept of rotor induction, explain what happens as the...
Question2 A5: Explain self and mutual induction Magnede Two coils, coil1 and coil2 are placed next to each other. Coil1 is connected to an alternating voltage V which supplies a changing current in coil 1 (i) Draw the diagram (i) Explain Induced emf by self inductance and label the diagram and (iii) Explain Induced emf by mutual inductance and label the same diagram (1,2,2 marks) Question3 B3: Explain mmf and list equations that links it to other factors (i)...
Magnetic Induction 1. You have two loops of wire that are parallel to each other (one of top of the other). What direction is the current in the upper loop when the lower loop a) Has no current passing through it. b) Right when 3A of direct current is turned on to the loop c) Some time later and the current is still flowing. d) Right when the current is turned off.
One application of electromagnetism is an electrical switch
called a “relay.” These are used in many different kinds of systems
that require a high power signal or circuit to be controlled by a
small signal, or that require the control circuit to be completely
electrically isolated from the controlled circuit. The long-range
“action at a distance” magnetic force provides a solution to these
issues. The diagram below left shows one possible relay geometry.
This would allow, for example, high voltage...
C) What is the magnetic induction (B) in air 0.0800 m from a long straight wire carrying a current of 14.0 A? I: 14 D) What is the magnetic field strength (B) in the center of a coil of wire in air with one turn (a loop) with a radius of 0.110 m and a current of 0.420 A? E) What is the magnetic flux density (B) in the center of a solenoid in air with a length 0.140 m...
What type of Selection? Number of cacti A. Artificial B. Directional C. Stabilizing D. Disruptive 70 80 90 100 110 120 130 Number of spines
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