An internship student was given a task to coordinate downstream and upstream protection of a distribution...

  

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An internship student was given a task to coordinate downstream and upstream protection of a distribution feeder. When checked, it was found that the current is high, the downstream protection tripped before the upstream protection. However, when the current is low, the upstream protection tripped before the downstream protection. As a supervising engineer, you are required to identify the problem, and brief the student how the correct setting should be done. 1. Problem/Project Guide: Students are expected to read and understand materials related to protection of power system network. Furthermore, students are also required to explore in the distribution system protection. Questions That Can Help You Tackle the Problem 1. How feeders are protected? 2. What are the settings available for the protection system being used? 3. What are the available characteristic of the relay? 4. What should be done if the downstream protection fails? The students have to accomplish their task within three weeks' time. As guide, students may follow the problem solving time-line as given in table below. (a) Problem-solving Time-line Activities 1. Understand/Identify/Brainstorming (Prepare group proposal, list materials, allocate tasks). . 2. Submit individual report/ Experiments and collect data. . 3. Analyse and interpret data/ Demonstration Assessment criteria are standardized for all laboratories and will generally be the same for all laboratories. For further understanding about the assessment criteria, please refer to PBL Third-year Laboratory Assessment document. Week 1 Week 2 Week 3 Report Writing Other than the general guide specified by the Laboratory Coordinator, the report must include: Experimental Procedures Experimental Data Photographs of the actual circuit construction Circuit diagram Photographs of your group members An internship student was given a task to coordinate downstream and upstream protection of a distribution feeder. When checked, it was found that the current is high, the downstream protection tripped before the upstream protection. However, when the current is low, the upstream protection tripped before the downstream protection. As a supervising engineer, you are required to identify the problem, and brief the student how the correct setting should be done. 1. Problem/Project Guide: Students are expected to read and understand materials related to protection of power system network. Furthermore, students are also required to explore in the distribution system protection. Questions That Can Help You Tackle the Problem 1. How feeders are protected? 2. What are the settings available for the protection system being used? 3. What are the available characteristic of the relay? 4. What should be done if the downstream protection fails? The students have to accomplish their task within three weeks' time. As guide, students may follow the problem solving time-line as given in table below. (a) Problem-solving Time-line Activities 1. Understand/Identify/Brainstorming (Prepare group proposal, list materials, allocate tasks). . 2. Submit individual report/ Experiments and collect data. . 3. Analyse and interpret data/ Demonstration Assessment criteria are standardized for all laboratories and will generally be the same for all laboratories. For further understanding about the assessment criteria, please refer to PBL Third-year Laboratory Assessment document. Week 1 Week 2 Week 3 Report Writing Other than the general guide specified by the Laboratory Coordinator, the report must include: Experimental Procedures Experimental Data Photographs of the actual circuit construction Circuit diagram Photographs of your group members

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