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Electrical power: Please do a Short answers for all of these questions.... thanks : 1. What is a ‘polarizing quantity’ with respect to directional overcurrent relays? How does the ground grid interact with this protective device? 2. Describe why it would be a bad idea to run away from a substation fault. 3. Explain why NERC considers a single DC ground in a substation to be a serious condition worth tracking at the regional level.
Assume that a substation transformer has a constant hazard rate of 0.005 per day. What is the probability that it will fail during the next 5 years? What is the probability that it will not fail?
A tower used in an electrical substation supports a power line
which exerts a horizontal tension of T = 500 lb on each side truss
of the tower as shown. Determine the force in members BC, CM, and
LM of a side truss and indicate whether the members are in tension
or compression.After a Recent cold spell, it has been seen that
substantial amounts of snow and ice have accumulated on top of the
structure. The top member of the...
2(b). In 2008 a new 21- KW power substation was built in Tippecanoe county of Indiana for 1.4 million dollars. A neighboring county is planning on building a similar though smaller substation in 2011. An 18- KW substation is planned for this county. The inflation rate between 2009 and 2011 has averaged 1.5% per year. If the power sizing exponent is 0.85 for this type of facility what is the estimated cost of construction? (8 pts.)
2(b). In 2008 a...
A tower used in an electrical substation supports a power line
which exerts a horizontal tension of T = 500 lb on each side truss
of the tower as shown. Determine the force in members BC, CM, and
LM of a side truss and indicate whether the members are in tension
or compression.After a Recent cold spell, it has been seen that
substantial amounts of snow and ice have accumulated on top of the
structure. The top member of the...
Assume that a substation transformer has a constant hazard rate of 0.005 per day. What is the probability that it will fail during the next 5 years? What is the probability that it will not fail?
what the information need
Q1: You are working in a load-substation and have collected the following data; from your 11kV, 50HZ substation. Actually, you are assigned to use systematic and professional approach to find out the monthly electricity bill with an appropriate tariff system, applied in Oman. With proper justification for the tariff system applied; suggest the monthly electricity bill. [10 Marks] Time in hr. 0-6 6-10 10-14 14 - 16 16.22 22 - 24 2485A at 5800A at 5250A...
1) A three-phase substation transformer operating at 34.5kV is loaded to 24 MVA. What is the per-phase current? (assume balanced conditions) 2) If the current calculated above lags the voltage by 30°, what is the breakdown of active and reactive loading on the transformer? (assume balanced conditions)
When approaching a substation its appearance can indicate the quality of maintenance or lack of. List at least 4 different things to look for when approaching a substation.
The long distance power transmission lines reaching a certain power substation operate at 375,000 V. This potential difference has to be "stepped down" for local distribution through city power lines at 14,300 V. Substations use very large, oil-cooled transformers (a photograph of one is in the text) to accomplish this conversion. What is the ratio of primary to secondary windings in a transformer in such a substation?