# New pages

Jump to navigation
Jump to search

(newest | oldest) View (newer 50 | older 50) (20 | 50 | 100 | 250 | 500)

- 05:18, 4 May 2021 Motor Starting Calculation (hist | edit) [23,940 bytes] Jules (talk | contribs) (Created page with "== Introduction == right|thumb|300px|Figure 1. High voltage motor (courtesy of ABB) This article considers the transient effects of motor starting on...")
- 22:48, 25 January 2021 Short Circuit Calculation (hist | edit) [1,603 bytes] Jules (talk | contribs) (Created page with "=== Introduction === Some of the related terms defined by the IEC's ''Electropedia'': Image:Power-line-short-circuit.jpg|right|thumb|350px|Figure 1. 110 kV power line shor...")
- 03:13, 25 December 2020 Electrical Load Schedule (hist | edit) [18,092 bytes] Jules (talk | contribs) (Created page with "== Introduction == 400px|thumb|right|Figure 1. Example of an electrical load schedule The electrical load schedule is an estimate of the instant...")
- 03:10, 25 December 2020 Low Frequency Induction (LFI) Calculation (hist | edit) [26,742 bytes] Jules (talk | contribs) (Created page with "== Introduction == Low frequency induction (LFI) in metal pipelines is a form of electromagnetic interference that occurs when high voltage transmission lines are run in para...")
- 03:05, 25 December 2020 Earthing Calculation (hist | edit) [38,026 bytes] Jules (talk | contribs) (Created page with "== Introduction == The earthing system in a plant / facility is very important for a few reasons, all of which are related to either the protection of people and equipment an...")
- 02:59, 25 December 2020 Cable Sizing Calculation (hist | edit) [29,608 bytes] Jules (talk | contribs) (Created page with "== Introduction == right This article examines the sizing of electrical cables (i.e. cross-sectional area) and its implementation in various inte...")
- 13:39, 22 November 2020 Short Circuit (hist | edit) [4,902 bytes] Jules (talk | contribs) (Created page with "A short circuit is an electrical fault where a conductive path (usually of low impedance) is formed between two or more conductive parts of an electrical system (e.g. phase-ph...")
- 08:27, 22 November 2020 Time Domain Simulations of Power Systems (hist | edit) [998 bytes] Jules (talk | contribs) (Created page with "In time domain simulations of power systems, a dynamic model is defined as any model that can be described by a set of differential-algebraic equations (DAE), commonly present...")
- 08:26, 22 November 2020 Transformer Inrush (hist | edit) [7,268 bytes] Jules (talk | contribs) (Created page with "Transformer (magnetising) inrush currents are caused by sudden step-changes in the transformer magnetising voltage and can be divided into three general types: :* '''Energisa...")
- 08:21, 22 November 2020 RL Circuit Switching (hist | edit) [6,118 bytes] Jules (talk | contribs) (Created page with "== Introduction == The RL switching / closing transient is one of the most common electrical transients that is encountered in practice, and is also the basis for the computa...")
- 08:20, 22 November 2020 Resonance (hist | edit) [3,257 bytes] Jules (talk | contribs) (Created page with "== Classical Derivations == === Series Resonance === right|thumb|264px|Figure 1. Classical series resonance circuit The classical circu...")
- 08:18, 22 November 2020 Remote Earth (hist | edit) [630 bytes] Jules (talk | contribs) (Created page with "Remote earth is a concept used to describe the resistance between one point in earth and an arbitrarily distant point (also in earth). The earth resistance between any two poi...")
- 08:17, 22 November 2020 Referring Impedances (hist | edit) [1,895 bytes] Jules (talk | contribs) (Created page with "In a system with multiple voltage levels, it is sometimes necessary convert impedances from one voltage to another, i.e. so that they can be used in a single equivalent circui...")
- 08:17, 22 November 2020 Photovoltaic Cell Model (hist | edit) [6,289 bytes] Jules (talk | contribs) (Created page with "The photovoltaic (PV) cell converts solar energy into electrical energy (direct current). It is often useful to take a cell operating at a certain solar irradiance and tempera...")
- 08:15, 22 November 2020 Network Interfacing (hist | edit) [3,073 bytes] Jules (talk | contribs) (Created page with "In dynamic time-domain simulations, network interfacing refers to the interfacing of dynamic models to the network and involves two main tasks: :* Reference frame transformat...")
- 08:14, 22 November 2020 Explicit Numerical Integrators (hist | edit) [1,390 bytes] Jules (talk | contribs) (Created page with "== Modified Euler Method == The modified Euler (or Heun's) method is a two-stage [http://en.wikipedia.org/wiki/Predictor%E2%80%93corrector_method predictor-corrector method]:...")
- 08:12, 22 November 2020 Inertia (hist | edit) [8,512 bytes] Jules (talk | contribs) (Created page with "In power systems engineering, "inertia" is a concept that typically refers to rotational inertia or rotational kinetic energy. For synchronous systems that run at some nominal...")
- 08:08, 22 November 2020 Induction Motor Performance (hist | edit) [641 bytes] Jules (talk | contribs) (Created page with "Induction motors typically run at highest efficiency and power factor at full-load. However when motors are run at lower load factors, there is generally a cor...")
- 08:01, 22 November 2020 Motor Parameter Estimation from Steady-State Models (hist | edit) [11,591 bytes] Jules (talk | contribs) (Created page with "Estimation of an induction motor's equivalent circuit parameters from steady-state models and manufacturer performance data is the most common approa...")
- 08:00, 22 November 2020 Induction Motor Torque (hist | edit) [4,238 bytes] Jules (talk | contribs) (Created page with "The torque developed in an induction machine can be calculated from the motor model / equivalent circuit because the torque developed is proportional...")
- 07:58, 22 November 2020 Induction Motor Model (hist | edit) [8,165 bytes] Jules (talk | contribs) (Created page with "== Single Cage Model == right|thumb|350px|Figure 1. Single cage model equivalent circuit The single cage model has the following para...")
- 07:55, 22 November 2020 Motor Driven Load (hist | edit) [1,810 bytes] Jules (talk | contribs) (Created page with "== Load Characteristics == === Constant Torque Loads === In this load characteristic, the torque is constant across the entire speed range. The power is therefore directly p...")
- 07:52, 22 November 2020 Dq0 Transform (hist | edit) [9,067 bytes] Jules (talk | contribs) (Created page with "The dq0 transform (often called the Park transform) is a space vector transformation of three-phase time-domain signals from a stationary phase coordinate system (ABC) to a ro...")
- 07:51, 22 November 2020 Clarke Transform (hist | edit) [9,481 bytes] Jules (talk | contribs) (Created page with "The Clarke or <math>\alpha \beta 0 \,</math> transform is a space vector transformation of time-domain signals (e.g. voltage, current, flux, etc) from a natural three-phase co...")
- 07:48, 22 November 2020 Complex Electrical Quantities (hist | edit) [5,705 bytes] Jules (talk | contribs) (Created page with "== Derivation == In 1897, [http://en.wikipedia.org/wiki/Charles_Proteus_Steinmetz Charles Proteus Steinmetz] first suggested representing sinusoidal AC waveforms as complex q...")
- 07:46, 22 November 2020 Frequency Dependent Line Model (hist | edit) [6,042 bytes] Jules (talk | contribs) (Created page with "== Motivation == right|thumb|500px|Figure 1. A generic single-phase distributed parameter line model In this section, we try to answer the que...")
- 07:44, 22 November 2020 Bergeron Line Model (hist | edit) [13,137 bytes] Jules (talk | contribs) (Created page with "== Introduction == The Bergeron line model is a discrete-time representation of the travelling wave model with constant line parameters that is...")
- 07:41, 22 November 2020 Travelling Wave Line Model (hist | edit) [18,634 bytes] Jules (talk | contribs) (Created page with "== Introduction == left|thumb|500px|Figure 1. Travelling wave along a line (image courtesy of [http://en.wikipedia.org Wikipedia]) A travelling w...")
- 07:38, 22 November 2020 Distributed Parameter Line Model (hist | edit) [28,577 bytes] Jules (talk | contribs) (Created page with "This article describes the steady-state or frequency domain distributed parameter line model. By steady-state, we mean that the voltage and current along the line are steady a...")
- 07:36, 22 November 2020 Multi-conductor Line Models (hist | edit) [9,646 bytes] Jules (talk | contribs) (Created page with "== Introduction == Image:DSCI0402.JPG|right|thumb|250px|Figure 1. Three-phase, single-circuit tower line (image courtesy of [http://en.wikipedia.org/wiki/File:DSCI0402.JPG...")
- 07:35, 22 November 2020 Single-Phase Line Models (hist | edit) [11,935 bytes] Jules (talk | contribs) (Created page with "== ABCD Parameters (Generalised Line Constants) == Consider the overhead line represented as a [http://en.wikipedia.org/wiki/Two-port_network two-port network] of the form:...")
- 14:27, 18 November 2020 Sequence Networks (hist | edit) [2,645 bytes] Jules (talk | contribs) (Created page with "right|thumb|450px|Reduced sequence networks: (a) Positive sequence, (b) Negative sequence, (c) Zero sequence In Symmetrical Components|symme...")
- 14:25, 18 November 2020 Symmetrical Components (hist | edit) [11,007 bytes] Jules (talk | contribs) (Created page with "Symmetrical components is a mathematical method for representing an unbalanced set of phasors into three decoupled (independent) sets of phasors - two balanced sets and a thir...")
- 14:14, 18 November 2020 Overhead Line Constants (hist | edit) [9,576 bytes] Jules (talk | contribs) (Created page with "left|thumb|700px|Figure 1. Circuit representation of a multi-conductor line segment <br clear=all> Image:DSCI0402.JPG|right|thumb|250px...")
- 14:12, 18 November 2020 Overhead Line Models (hist | edit) [7,519 bytes] Jules (talk | contribs) (Created page with "== Introduction == This article describes the most common overhead line (OHL) models used in power systems analysis. By line models, we mean equivalent circuits composed of el...")
- 14:10, 18 November 2020 Infinite Bus (hist | edit) [2,512 bytes] Jules (talk | contribs) (Created page with "The infinite bus concept is a simplifying assumption that is applied to buses or nodes with an infinite upstream fault capacity (or an equivalent upstream source impedance of...")
- 14:04, 18 November 2020 Simple Power Flow Example (hist | edit) [4,858 bytes] Jules (talk | contribs) (Created page with "Consider the simple model shown in Figure 1, where a large stiff network supplies a constant power load <math>\boldsymbol{S} \, </math> through an impedance <...")
- 14:03, 18 November 2020 Newton-Raphson Power Flow (hist | edit) [19,158 bytes] Jules (talk | contribs) (Created page with "The Newton-Raphson algorithm is the most commonly used iterative method to solve the power flow problem. == Derivation of the Newton-Raphson Method using Taylo...")
- 13:59, 18 November 2020 Power Flow (hist | edit) [19,622 bytes] Jules (talk | contribs) (Created page with "== Introduction == The objective of the '''power flow''' (or '''load flow''') calculation is to determine the steady-state operating conditions of an electrical network. The...")
- 13:55, 18 November 2020 Electrical Power (hist | edit) [15,578 bytes] Jules (talk | contribs) (Created page with "How do the various formulae for electrical power fit together? What is the difference between DC, AC and complex power and how do they harmonise with our physical conceptions...")
- 13:52, 18 November 2020 AC Power Transmission (hist | edit) [4,925 bytes] Jules (talk | contribs) (Created page with "== Introduction == Consider the following model depicting the transfer of AC power between two buses across a line: Image:AC_Transmission_Model.PNG|left|frame|250px|Figure...")
- 13:50, 18 November 2020 Transformer Impedance (hist | edit) [7,931 bytes] Jules (talk | contribs) (Created page with "== Positive Sequence Impedance == The transformer positive sequence impedance is also called the short circuit impedance (because it is measured from a short circuit test) or...")
- 13:48, 18 November 2020 2 Winding Transformer Models (hist | edit) [4,460 bytes] Jules (talk | contribs) (Created page with "== Positive Sequence Model == right|thumb|500px|Figure 1. Positive sequence two-winding transformer equivalent circuit The standard positive s...")
- 13:58, 16 November 2020 IP Rating (hist | edit) [4,255 bytes] Jules (talk | contribs) (Created page with "== Introduction == IP Rating refers to the International Protection or Ingress Protection of electrical enclosures, against the intrusion of solid objects, water, dust and ac...")
- 13:55, 16 November 2020 Cable Voltage Grade (hist | edit) [3,311 bytes] Jules (talk | contribs) (Created page with "== Definition == right|thumb|400px|Figure 1. Meaning of U and U0 AC cables are designed to be suitable for specific design voltages, which i...")
- 13:52, 16 November 2020 Modified Admittance Matrix (hist | edit) [4,578 bytes] Jules (talk | contribs) (Created page with "In dynamic time-domain simulations, the network model is based on a steady-state power flow solution, which also provides the initial conditions for the dynamic...")
- 13:50, 16 November 2020 Complex Impedance (hist | edit) [2,356 bytes] Jules (talk | contribs) (Created page with "Complex impedances are commonly used quantities in the analysis of AC power systems. A complex impedance is represented by the following relation: : <math> Z = R + jX \, </ma...")
- 13:47, 16 November 2020 Ill-Conditioning (hist | edit) [2,500 bytes] Jules (talk | contribs) (Created page with "In some power systems, the Jacobian matrix can be ill-conditioned, leading to difficulties in reaching a valid a power flow solution. == Ill-Conditioned Matrices == A matrix...")
- 13:46, 16 November 2020 Per-unit System (hist | edit) [6,973 bytes] Jules (talk | contribs) (Created page with "== Introduction == The per-unit system is a method of expressing quantities in an electrical system (e.g. voltage, current, impedance, etc) as a proportion of pre-defined bas...")
- 13:44, 16 November 2020 Kron Reduction (hist | edit) [3,841 bytes] Jules (talk | contribs) (Created page with "The Kron Reduction is a relatively simple technique for eliminating nodes from a network when the voltage or current at that node is zero. The technique is named after [http:/...")