This module builds and reinforces the knowledge gained from the Electrical Plant and Electrical Science modules. The aim of this module is to build on the subject matter of electrical services plant year 2 and develop a more analytical knowledge of the performance characteristics of electrical plant and equipment. To understand the requirements for commissioning procedures and documentation. Students are also given the opportunity to test and confirm theoretical concepts and to become familiar with a range of electrical plant equipment in a laboratory setting.
• Transformers: Complete phasor diagram for a transformer on load. Equivalent circuit. Regulation, maximum and all-day efficiency. Transformer tests, open and short- circuit tests. Protective devices. Three-phase transformers. Parallel operation of transformers. Autotransformers. Instrument transformers.
• Induction motor: Equivalent circuit. Stator circle diagram. Variation of torque with slip. Maximum torque. Speed control, modern methods, Separate windings and pole changing.
• Standby supplies, motor-driven generator sets. Generator ratings, continuous and standby ratings. Transient and general performance. Standby plant, containment of noise, cooling, dissipation of exhaust fumes, physical and electrical problems in the siting of standby equipment. Parallel operation, peak lopping system. ESB requirements, ETCI rules.
• Uninterruptible Power Supplies, transients on power lines problems of radio frequency interference, electromagnetic interference. Electrical noise, Voltage surges, sags, blackouts and spikes, characteristics. On-line and off-line UPS equipment. Voltage and frequency regulation. Categories and segregation of wiring. Power quality audit.
• Maintenance requirements for switchgear, transformers, rotating machines. Sample test procedures for motors, transformers and switchgear. Planned maintenance routines, records and databases, use of inspection check lists and manufacturers recommendations.
• Project commissioning: initial planning and task linking with overall project. Types of tests including works tests, erection tests performance tests and acceptance tests.
• Documentation systems: need for standard test procedures and protocol. Document tracking and51
recording.
• Preparation of Operation and Maintenance (O & M) Manuals.
• Hazardous area equipment, intrinsically safe barriers, design and selection.
• Efficiency and optimization of plant performance
Laboratory
• Carry out tests on single-phase transformers and analyse results
• Carry out tests on three-phase induction motors and analyse results
• Carry out tests on three-phase synchronous motors and analyse results
This module is delivered by means of lectures, assignments, workshop, laboratory, demonstrations and when appropriate site visits.
| Module Content & Assessment | |
|---|---|
| Assessment Breakdown | % |
| Formal Examination | 30 |
| Other Assessment(s) | 70 |