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Teaching GuideTerm 2023/24 Escola Politécnica de Enxeñaría de Ferrol |
| Grao en Enxeñaría Eléctrica |
 Subjects |
| High-voltage electrical installations |
| Contents |
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| Identifying Data | 2023/24 | |||||||||||||
| Subject | High-voltage electrical installations | Code | 770G02027 | |||||||||||
| Study programme |
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| Descriptors | Cycle | Period | Year | Type | Credits | |||||||||
| Graduate | 2nd four-month period |
Third | Obligatory | 6 | ||||||||||
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| Topic | Sub-topic |
| Summary according to the degree report | Medium and high voltage installations. Switchgear Electrical substations and transformation centers. General characteristics. Protections. Elements and basic strategies for the protection of electrical systems. Protection of fundamental elements of electric power systems. Surges and protection. Introduction to insulation coordination. Quality of service and electricity supply. |
| Node Admittance and Impedance Matrices | Matrix equations for node analysis by direct inspection of circuits. Matrix equations for node analysis from the connection matrices. Definition of the node admittance matrix. Definition of the node impedance matrix. Incorporation of magnetic couplings. Construction of the node impedance matrix step by step. |
| Symmetrical Short Circuit Calculation | Balanced three-phase short circuit of a no-load line. Balanced three-phase short circuit of a no-load synchronous machine. Definition of transitory and sub-transitory regimes. Calculation of symmetrical short circuits by the substitution method. Application of the node impedance matrix to the calculation of symmetrical short circuits. |
| Symmetrical Components | Fortescue–Stokvys theorem. Direct and inverse transformation matrices. Properties of symmetric component systems. Representation of balanced charges. Representation of a balanced system with unbalanced charge. Sequence impedances of synchronous generators, transmission lines and transformers with different connection groups |
| Calculation of Asymmetric Short Circuits | Rules for the construction of direct, inverse and homopolar sequence circuits. Calculation models with symmetrical components for phase-earth, phase-phase, phase-phase-earth faults. Open conductor faults. |
| Load Flows | Calculation study of node voltages and load flows. Iterative resolution methods: Newton-Raphson, Gauss-Seidel. |
| Substations | Elements of the substations. Bar games. Operations with the bars in the substations. |
| Electric Arc | Physical foundations. Static arc characteristic in direct current. Interruption of the arc in direct current. Interruption of the arc in alternating current. |
| Circuit Interruption | Disconnectors. Power switches. Types and operation. |
| Protection of Power Systems | Characteristics and functions of a protection system. Voltage and current transformers. relays. Characteristics. Overcurrent relays. Timed overcurrent relays. Relays with two inputs. General formula for activating a relay. Sequence filters. Bar protection. Transformer protection. Protection of generators and motors. Line protection. Overcurrent protection in radial lines Directional relays. Distance relays (impedance). Modified impedance relays. Relay response to unbalanced faults. |
| Grounding installations | Definitions. Electrodes and ground lines. Step and touch voltages. Distributions of potential and grounding resistance of basic electrodes. Calculations with multi-electrode systems. |
| Neutral Treatment in Power Systems | Definitions. Study of the single-phase fault in a network with isolated neutral. Study of the single-phase fault in a network with extinguishing coil. Study of the single-phase fault in a network with the neutral grounded. Definition of the grounding coefficient. |
| Transient Recovery Voltage (TRV) | Study of the TRV by the current injection method. Calculation of the TRV for a short circuit in the generator terminals. Calculation of the TRV for a kilometer fault. Calculation of the TRV for a fault on the line. First pole factor. |
| Overvoltage and Insulation Coordination | Types and origin of surges. Traveling waves and surge propagation. Bewley's method for calculating overvoltages. Generation of surges in transmission lines. Direct and indirect downloads. Behavior of lines against lightning. Protection of lines against lightning. Lightning rod. Types and behavior of lightning rods. Isolation Coordination. Basic level of impulse isolation. Standardized test waves for the study of overvoltages. Voltage-time characteristic. |
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