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Discrimination (Selectivity or coordination) Problem: Given the below single line diagram where, the red curve is for a PD1 circuit breaker (Upstream). The blue curve is for a PD2 circuit breaker (Down stream) SUPPLY See the following curves to check the discrimination at the red, green and blue arrows (if the fault happened at the downstream PD2) N NOT DISCRIMINATING WITH UPSTREAM DEVICE 4h 2h 1h 30 m 10 m 50 s 8s 5s 25 0,800 s 0.500 s 0.300 s 200s 0.080 s 0.050s 8838: 0.010s 0.0050 s 0.0010s Current (A) The time selectivity between PD1 and PD2 if the fault happens at PD2 for a current rating coincides with green arrow is Select one: O a At = 47seconds 1/20/22, 4:08 PM O b. At = 27seconds Oc. At = 57seconds Od. At = 37seconds O e. None of these Of At = 7seconds Tripping Time

Question 1:a) State why voltage control and cable stranding are necessary in powersystemsb) Briefly explain where and how the following state variables ofa power supply grid are controlled.i) Frequencyii) Active powerili) Reactive poweriv Voltage.

Calculate the self-GMD of stranded wire with 2 strands. a. Radius of each strand is 0.001 inch. b. The radius is doubled.c. The radius is halved

4. A string of suspension insulators consists of three units. The capacitance between each link pin and earth is one-sixth of the self-capacitance of each unit. If the maximum voltage per unit is not to exceed 35 kV, determine the maximum voltage that the string can withstand. Also calculate the string efficiency. [84-7 kV; 80-67%]

The symmetrical short circuit current is ______________________ quantity in nature. a-Exponential b-Ramp c-Alternating  d-Direct

1 - Why make two wire, three wire or four wire connection in RTD connection?A) To be a backup connection lineB) To increase the magnetic fieldC) Because the resistance of the long connecting wires causes errorD) To increase the costE) For better cooling

In an outdoor substation the three bus-bar conductors are supported by units of post type insulators. Each unit consists of a stack of 3 pin type insulators fixed one on the top of the other. The voltage across the lowest insulator is 13kV and that across the next unit is 12KV. Estimate: 17. i. ratio of mutual to self-capacitance ii. the bus-bar voltage of the substation. iii. Efficiency across the string of insulators

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EMF in a circuit is ____. a. Cause current to flow b. Maintains potential difference c. Increases the circuit resistance d. Decreases the circuit resistance e. None of the Choices

2) You have an underground buried cable, suppose the cable is defected (open circuit) somewhere along its length. Explain with the needed diagrams, how you can locate the position of the failure point. Suppose that you can calculate Vp from the characteristic of the cable.

Analyse several voltage and current situations in different loading scenarios in a simplified radial (transformer to consumption) medium-voltage power system example. There are only 2 nodes in the 35 kV line – node 0 from the 110/35 kV and node 1 with one consumer. The physical characteristics of the line and the loading scenarios are individualized for each student – please see the attached file Excel “WM9P3 Task1 data” for your particular data set.  Briefly reflect on the complexity of the calculations for known input or output voltage, as well as for fixed or voltage-dependent consumption in this simple power system model.  Analyse and discuss the sensitivity of the voltage drop [in % of amplitude and the degrees of phase] with respect to the current level [in %] and to the power factor.

the course is power transmission system... Question : Differentiate between capacitance grading and Intersheath grading? dont just copy from google. thanks :)

Which of the following is the code of installation (single core single wire) cable? Tesisat kablosunun kodu aşağıdakilerden hangisidir? A) YW (NYY) B) NV (NYA) C) NYCY (YVMV) O D) NVV (NYM) E) NYMHY (H05VV-F)

Identify and describe the step-by-step process used to pull cable and also describe the step-by-step process used to install cable in buildings? Note: Please do not handwriting

Q1. Are the statements True or false? correct the wrong statements 1. The overhead Transmission line is rarely used for power transmission due to the installation costs compared with the underground cables. 2. The aluminum conductor has almost one-half the weight of the equivalent copper conductor because aluminum's specific gravity is more than for the copper. 3. Creosote oil is the most commonly used material for insulators of the overhead line. 4. The discharge occurs between the insulator and the bin through the conductor's body, called a puncture. 5. The low cost of pin insulators enables it to be a good alternative for the suspension insulators when the line voltage exceeds 33kV. 6. Shunt capacitance in transmission towers has less value than the self-capacitance between each disc's metal fitting and the earth. x

Solve 34 plz fasttt...hand written plz  i'll give you multiple upvote

q17) please need correct answer fast and short  also clear write please

Transmission and distribution lines are important components of any power system study. Aluminium cable steel reinforced (ACSR) (with steel in the centre – as shown in Figure Q1 is normally chosen instead of copper for transmission Explain: (a)The choice of aluminium instead of copper (b)The need to use and place steel at the core

2. What's the primary instrument for locating a break in a cable during emergency maintenance?A. OSAB. OTDRC. MultimeterD. Power meter

Q2(b) Sketch and analyse the various methods to improve the string efficiency for an overhead line having number of units of insulators: i) Guard Ring Technique; ii) Grading Technique.

Problem 3: Commutators (. Solve for the commutator: (a) [Sz, §°] (b) [§2,1] (c) [§2, P,] (d) [$,, P,] (e) [$», §,]