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Consider the plunger-type relay shown below. The pickup current is 5A and the drop out current is 3.57A. The pole face has a height of 1.5 cm, while the spring holds the plunger 1 cm out of the coil when the current is below the pickup value. The air gap 'g' is 0.2 cm, and 'gd/4a' = 0.05. Let the spring force Fs be a constant, with a value of 0.001 N, and let the mass of the plunger be 0.005 kg. Let the travel of the plunger be 3 mm before it hits a stop and closes its contacts. If I-2, then the operating time would be equal to: F Select one: a. None of these O b. 1.25s ○ c. 0.75s O d. 0.25s t = 100(x-x1) 1.48 In-1 Consider the system below where a fault F has taken place between breakers B1 and B2. If R1, B1, R5, B5, R6 and B6 operate, then the system response would be characterized by the following: Rs B R3 B3 R₁ B₁ R2 B2 R4 B4 R6 Be Select one: O a. Response incorrect and inappropriate b. All of these ○ c. R2 failed to operate: Incorrect and loss of security O d. R5, R6 initiate B5, B6 as remote back up protection Clear my choice

Consider the plunger-type relay shown below. The pickup current is 5A and the drop out current is 3.57A. The pole face has a height of 1.5 cm, while the spring holds the plunger 1 cm out of the coil when the current is below the pickup value. The air gap 'g' is 0.2 cm, and 'gd/4a' = 0.05. Let the spring force Fs be a constant, with a value of 0.001 N, and let the mass of the plunger be 0.005 kg. Let the travel of the plunger be 3 mm before it hits a stop and closes its contacts. If I-2, then the operating time would be equal to: F Select one: a. None of these O b. 1.25s ○ c. 0.75s O d. 0.25s t = 100(x-x1) 1.48 In-1 Consider the system below where a fault F has taken place between breakers B1 and B2. If R1, B1, R5, B5, R6 and B6 operate, then the system response would be characterized by the following: Rs B R3 B3 R₁ B₁ R2 B2 R4 B4 R6 Be Select one: O a. Response incorrect and inappropriate b. All of these ○ c. R2 failed to operate: Incorrect and loss of security O d. R5, R6 initiate B5, B6 as remote back up protection Clear my choice

Power System Analysis and Design (MindTap Course List)
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter12: Power System Controls
Section: Chapter Questions
Problem 12.4P
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Consider the plunger-type relay shown below. The pickup current is 5A and the drop out current is 3.57A. The pole face has a height of 1.5 cm, while the spring holds the plunger 1 cm out of the coil when the current is below the pickup value. The air gap 'g' is 0.2 cm, and 'gd/4a' = 0.05. Let the spring force Fs be a constant, with a value of 0.001 N, and let the mass of the plunger be 0.005 kg. Let the travel of the plunger be 3 mm before it hits a stop and closes its contacts. If I-2, then the operating time would be equal to: F Select one: a. None of these O b. 1.25s ○ c. 0.75s O d. 0.25s t = 100(x-x1) 1.48 In-1
Transcribed Image Text:Consider the plunger-type relay shown below. The pickup current is 5A and the drop out current is 3.57A. The pole face has a height of 1.5 cm, while the spring holds the plunger 1 cm out of the coil when the current is below the pickup value. The air gap 'g' is 0.2 cm, and 'gd/4a' = 0.05. Let the spring force Fs be a constant, with a value of 0.001 N, and let the mass of the plunger be 0.005 kg. Let the travel of the plunger be 3 mm before it hits a stop and closes its contacts. If I-2, then the operating time would be equal to: F Select one: a. None of these O b. 1.25s ○ c. 0.75s O d. 0.25s t = 100(x-x1) 1.48 In-1
Consider the system below where a fault F has taken place between breakers B1 and B2. If R1, B1, R5, B5, R6 and B6 operate, then the system response would be characterized by the following: Rs B R3 B3 R₁ B₁ R2 B2 R4 B4 R6 Be Select one: O a. Response incorrect and inappropriate b. All of these ○ c. R2 failed to operate: Incorrect and loss of security O d. R5, R6 initiate B5, B6 as remote back up protection Clear my choice
Transcribed Image Text:Consider the system below where a fault F has taken place between breakers B1 and B2. If R1, B1, R5, B5, R6 and B6 operate, then the system response would be characterized by the following: Rs B R3 B3 R₁ B₁ R2 B2 R4 B4 R6 Be Select one: O a. Response incorrect and inappropriate b. All of these ○ c. R2 failed to operate: Incorrect and loss of security O d. R5, R6 initiate B5, B6 as remote back up protection Clear my choice
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