Listed series-rated equipment allows the branch-circuit breakers to have a lower interrupting rating than the main. What two sections of the National Electrical Code 2017 cover the marking of series-rated systems with the words CAUTION-SERIES RATED SYSTEM?

Which term is synonymous with short-circuit current rating?                                                      A. Fuse rating b. Fault rating c. Withstand rating d. Breaker rating

In its simplest form, ____ completes a path through which fault current can flow. Select one: A. GROUNDING B. SHUNTING C. BONDING D. BENDING

And interrupting rating is a/an_____rating, which is a measure of the fuses or circuit breakers ability to safely open in electrical circuit under fault conditions. A. Recommended b. Maximum c. Minimum d. Average

Q3. i) Identify the type of the fault can happen for the situation below. "when a mechanical excavator cuts quickly through a whole 3 phase overhead line". Justify your answer. ii) Examine the assumptions and calculation steps for the identified fault analysis in Q3(i). iii) Illustrate applications of the fault analysis in the Q3(ii).

In a short-circuit test on a 3-pole, 110 kV circuit breaker.  Power factor of the fault= 0.4. Recovery voltage= 0.95 times (full line voltage)   The breaking current was symmetrical the restriking transient had a natural frequency of 15000 c/s. Determine the average rate of rise of restriking voltage. (The natural is grounded and the fault involves earth). Explain in details.

What are the different types of power system faults, and how do they affect system operation?

True False Bonding must be accomplished around conduit connections whenever the fault current return path is suspect as well as when specifically required by the NEC

12. Which of the following statements about ground faults is true?A. They can happen if a conductive tool is dropped in an energized equipment's electrical enclosure.B. They usually occur between any grounded circuit conductor and the equipment grounding conductor.C. They can't result from human error.D. They're often normal and typically intentional.

Figure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and the motors are as shown in the figure. The reactance of lines 1 and 2 are 40 ohms and 50 ohms respectively. Assume that system is unloaded, and the generators are generating their rated voltage. Select the generator G₁ ratings as base values. Choose the fault location in bus 1, bus 2, or bus 3.( Only one bus location) And give this answer For a symmetrical three phase fault on the bus 1.Draw the reactance diagram for the fault with all the reactances marked in per unit. 2.Determine the Thevenin's equivalent circuit which can be used to calculate the fault current. (3) Calculate the fault current in ampere and fault power in MVA. (4) Calculate the fault current contribution from the generator connected to the bus for fault calculation.