4.2.2 Lab

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%]

Two cities A and B are connected by a 200km long train line. A train leaves A for B at 20 km / h at the same time as another train leaves B for A at 5 km / h. In the samemoment a fly leaves from A to B following the train line. The fly flies at 40 km / h until it collides with train B. At that moment it returns instantly and follows the train line until it collides with train A. At that moment it returns instantly and follows the line of the train. train until it collides with train B. The fly continues this process, traveling ever smaller distances until the two trains meet. (It is an ideal problem and the fly does not get squashed by the trains).What is the total distance traveled by the fly?

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.

Shown in the figure, ahydroelectric plant has two devices, a turbine and a generator.  If the efficiency of the whole plat is are =80 % , the efficienty of the generator is =93 %, calculate the efficiency of the turbine _____%

Some electricians do not bother to calculate the minimum size of neutral service conductor. They size the minimum ungrounded conductor size and then use this information to determine the minimum neutral conductor size. Explain how they determine the minimum neutral size using the minimum ungrounded conductor siz

From time to time, depending on the conductor size, an electrician has to re-identify a conductor as a grounded conductor or a grounding conductor. Wrapping the conductor with green electrical tape is the most common way to re-identify a grounding conductor. White tape is used to re-identify a grounded conductor. Discuss the difference in the way a grounding conductor is re-identified with green tape and how a grounded conductor is re-identified with white tape

Which of the following statements is/are true? (A In purely inductive circuit, the current leads voltage. (B) In purely resistive circuit, the current lags voltage. C In purely resistive circuit, the current is in phase with voltage. D In purely capacitive circuit, the voltage lags current.

9

What is the relation between length of span and sag?: a. sag is directly proportional to square of span b. sag is inversely proportional to squareroot of span C. sag is inversely proportional to square of span d. sag is directly proportional to squareroot of span

With schematic diagram, explain the Wind Power Plant.

A-seismograph works by transferring movements of the earth to a graph. (See illustration below.)-↓ ↓ frame transmits Earth's vibrations to wire frame- wire heavy weight rotating paper drum. pen seismogram tracing of vibrations horizontal Earth movements ↓ base set into the ground In-1935-Charles-F. Richter of Cal-Tech developed a-scale for measuring the magnitude of earthquakes. The Richter Scale formula-is-given-hye E MR = 108 10 E where M* is the Richter magnitude of the earthquake. E joules is the energy released-by-the- earthquake, and E =10** joules is the reference energy of a very small, imperceptible- earthquake. (See plot-below.)< a) When the energy of an earthquake is tripled, by how much does the Richter magnitude- increase? b)→In 1906, the San Francisco Bay area suffered severe damage from an earthquake estimated-to- have had a magnitude of 8.3. The largest earthquake magnitude ever measured was 8.9 for an earthquake-in-Japan-in-1933. Determine the ratio of the energy of…