A 132kV/ 33kV substation requires certain safety precautions to in place in order to operate. Discuss what type of basic devices may be required to allow the substation to operate safely, and what type of equipment is usually installed in order to allow adequate maintenance of a large substation.
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A 132kV/ 33kV substation requires certain safety precautions to in place in order to operate. Discuss what type of basic devices may be required to allow the substation to operate safely, and what type of equipment is usually installed in order to allow adequate maintenance of a large substation.
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- Write a short essay about the difference between an indoor and an outdoor substation. Compare each substation in terms of operation, specifications, and setup.Load in Figure 1 needs to be connected to Mains Switch Board (MSB) using multicore PVC cable. As a maintenance engineer, you need to proposed cable size for the load, Determine the following issues. 1) Calculate current demand for the circuit. 1) Detemine suitable MCCB (Model and nominal current rating) should be used to protect the load against over-current. im Propose suitable cable size for the load in Figure 1. iv) Calculate voltage drop of the proposed cable WITHOUT consider the cable reactance and voltage drop correction due to higher cable operating temperature v) Calculate voltage drop of the proposed cable BY consider the cable reactance and voltage drop correction due to higher cable operatıng temperature vi) If the multicore PVC eable is change into 3 single core PVC cables, what the suitable cable size. All other multicore cables not available. (25 + variable x) m (A) 30 m (B) (15 + variable b) m (C) Multicore PVC cable MCCB 95 kW. (400 + variable y) V. 0.85 p.f. Load MSB…Discuss the concept of electrical substations and their function within a power system.
- explain outdoor substationA computer's power supply converts mains AC to low-voltage regulated DC power for the internal components of a computer. You are building a new computer. You are deciding which type of power supply to install. Which of the following definitions BEST describes a valid type of power supply? Correct Answer: A single-rail power supply provides one rail (PCB trace). This provides the best safety for the computer by providing a single point of shutdown in the event of a short circuit. Correct Answer: A single-rail power supply provides one rail (PCB trace) used to always provide equal wattage to all devices attached to the power supply. Correct Answer: A dual-rail power supply provides separate rails (PCB traces) used to provide equal wattage to the devices attached to each rail. Correct Answer: A dual-rail power supply provides separate rails (PCB traces) used to balance the power load between multiple circuits, which prevents any one circuit from becoming overloaded.2. A facility manager replaces all the TS lights in an office when they have reached 80% of their rated life of 20,000 hours. The lights operate for 12 hours each day, 5 days per week for 52 weeks of the year. What is the group re-lamping interval for these lights? a. 3.7 years b. 4.6 years c. 5.1 years d. 6.4 years
- Describe how the following tests can be undertaken and state their relevance;i. Continuity Test ii. Insulation Test iii. Earth Resistance Test.5 a) Discuss Electricity power generation and distribution to residential properties. b) with diagrams explain how a Distribution Board is wired to provide electricity to a residential property. c) Explain the following materials and Accessories. i. Male and female bushings. ii male and female adaptors iii. Couplings. iv. Wire/cable sizes and their usCalculate the following. a) Expected voltage at “A” with switch SW1 open. b) Expected voltage at “A” with switch SW1 closed.
- 5- An instrument is used for lowering the value of voltage for measuring and protection is a. Circuit breaker b. Protection relay c. Isolator d. Current transformer e. Potential transformer 6- are the protective devices used for protection of equipment from lightning strokes a. Isolators b. Lighting arrestors c. Busbars d. Fuses e. Wave trap 7- The range of voltages between 1KV to 35kV is classified as: a. Low voltage b. Medium voltage c. High voltage d. Extra high voltage e. Ultra high voltageA. Discuss the arcing phenomenon in a circuit breaker. B. Discuss the types of oil circuit breakers. With references36. Electrical explosions directly into the face of a person working on or near energized electrical equipment can and will cause serious injury or death. OSHA laws and NFPA 70E have strict safety requirements for working on electrical equipment. The basic rules are to turn off the power before working on the equipment and to wear the proper type of nonflammable clothing. To further provide safety for the worker, the National Electrical Code has a requirement pertaining to arc-flash hazard warning. This requirement is found in a. 110.16 (A) b. 220.1 of the NEC C. 330.1 d. 410.5