Question

(b) A 400 A circuit is to be protected by a CT and relays. The relays...

(b) A 400 A circuit is to be protected by a CT and relays. The relays present a 2.5 VA burden. If the setting is 20% and there is saturation of 50% at 20 × current setting, specify a suitable CT.

Science   Advanced-Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
1. A circuit has a 400 resistance in one branch, a 50 inductive reactance in the...
1. A circuit has a 400 resistance in one branch, a 50 inductive reactance in the second and 40 capacitive reactance in the third. It is fed from a 240 V, 50 Hz supply. Find (a) Current in all branches (b) Total current (c) Circuit impedance (d) Circuit admittance (e) Power factor (f) Apparent power (g) Active power (h) Reactive power (i) Parameters of equivalent series circuit
(a) State two disadvantages of Time Graded Protection Systems. (b) State two advantages and a disadvantage...
(a) State two disadvantages of Time Graded Protection Systems. (b) State two advantages and a disadvantage of Differential Protection Systems. (c) What is the preferred secondary current rating of a CT for a Differential Protection System? Why is this rating preferred? (d) State the minimum time grading interval between two relays and give reasons for this interval. (e) Complete the following: 1. Desired relay operating time = TMS × .................... 2. Saturation can be a feature of CTs and .......................
29. Where the outside feeder disconnecting means consists of more than one switch or circuit breaker,...
29. Where the outside feeder disconnecting means consists of more than one switch or circuit breaker, determining the rating of the disconnecting means shall be permitted to be done by _____. A. Adding all circuit breakers and dividing by 2 B. Adding connected load and dividing by 1732 C. Combining the ratings of all the switches or circuit breakers D. Calculating the load by taking the first 3,000 VA at 100 percent 30. A 480/240 Volt, Step-down transformer with a...
A series RLC circuit has R = 400 ?, L = 1.35 H, C = 3.8...
A series RLC circuit has R = 400 ?, L = 1.35 H, C = 3.8 ?F. It is connected to an AC source with f = 60.0 Hz and ?Vmax = 150 V. Suppose the frequency is now increased to f = 93 Hz, and we want to keep the impedance unchanged. (a) What new resistance should we use to achieve this goal? R = ____ ? (b) What is the phase angle (in degrees) between the current and...
71. On a low-voltage luminaire rated 30 volts or less, the output circuit of the power...
71. On a low-voltage luminaire rated 30 volts or less, the output circuit of the power supply shall be limited to a maximum of _____ amperes. A. 15 B. 20 C. 25 D. 30 72. What is the minimum distance, in inches, a receptacle face must project beyond a metal face plate? A. 0.015 B. 0.020 C. 0.025 D. 0.030 73. "Life safety branch" is a sub system of the emergency power system required in a ______. A. Hazardous area...
The 400 V, 50 kVA, 0.8 power factor leading delta connected synchronous motor has synchronous reactance...
The 400 V, 50 kVA, 0.8 power factor leading delta connected synchronous motor has synchronous reactance of 3-ohm, resistance neglected. It is supplying a 12-kW load with initial power factor of 0.86 lagging. The windage and friction losses are 2.0 kW and the core losses are 1.5 kW. Determine (a) the motor efficiency; the line current; armature current; and excitation voltage. (b) If the flux of the motor is increased by 20 percent determine the excitation voltage; armature current; and...
[b] In an engineering campus, there are 400 first year students. 270 students study Electrical Engineering,...
[b] In an engineering campus, there are 400 first year students. 270 students study Electrical Engineering, 300 students study Mechanical and Manufacturing and 50 takes the Aerospace Engineering. Those studying Electrical Engineering also study Mechanical and Manufacturing, 20 takes Electrical Engineering and Aerospace Engineering while 35 takes Mechanical and Manufacturing and Aerospace Engineering. If one of these students is selected at random, find the probability that (i) The student takes Mechanical and Manufacturing, but not Aerospace or Electrical Engineering. (ii)...
Question 17 Given the following information: sales = $525; costs = $400; tax rate = 34%....
Question 17 Given the following information: sales = $525; costs = $400; tax rate = 34%. Assuming costs run at a constant percentage of sales, if sales rise by 10% next year, what will net income be? Select one: a. $33.00 b. $90.75 c. $3.30 d. $72.60 e. $66.00 Question 18 The financial statement summarizing the value of a firm's current assets on a particular date is the balance sheet. Select one: True False Question 19 If you borrow $5,000,...
30. A 480/240 Volt, Step-down transformer with a primary current of 200 amperes will have an...
30. A 480/240 Volt, Step-down transformer with a primary current of 200 amperes will have an approximate secondary current of ______ amperes. A. 100 B. 200 C. 300 D. 400 31. The inverter output of a stand-alone photovoltaic system shall be permitted to supply 120 volts to a single-phase, 3-wire 120/240 volt service where there are no _____ on the system. A. Motors connected B. Transformers connected C. Multi-wire branch circuits D. Appliance branch circuits 32. When a combination transformer...
Electrical Circuit A) A factory (with frequency 60 HZ) has the following electrical loads: Induction motors   ...
Electrical Circuit A) A factory (with frequency 60 HZ) has the following electrical loads: Induction motors    of 16 kW at a lagging power factor of 0.8. Induction motors    of 20 kW at a lagging power factor of 0.7. Load of 12 KVA at a lagging factor of 0.9. Load of 10 KVAR at a leading factor of 0.8 a-what is the overall power factor of the factory. b- Assume that the voltage at the input to the factory is 440...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT