Chapter 2 FAULT IMPEDANCE LOOPS AND OVERHEAD LINE
... E = pre-fault or Thevenin’s voltage at the point of fault just prior to the fault. Since the majority of system faults that occur on the Eskom transmission system are single-phase-to-earth faults, only the full sequence component analysis for these types of faults will be shown. A faulted circuit ca ...
... E = pre-fault or Thevenin’s voltage at the point of fault just prior to the fault. Since the majority of system faults that occur on the Eskom transmission system are single-phase-to-earth faults, only the full sequence component analysis for these types of faults will be shown. A faulted circuit ca ...
Developing an effective SCCR plan for facilities
... sufficient “withstand“ ratings in conjunction with overcurrent protective devices so that they do not sustain extensive damage. This rating, called the Short-Circuit Current Rating (SCCR) of the device, is typically applied to components that do not provide overcurrent protection and are used in pow ...
... sufficient “withstand“ ratings in conjunction with overcurrent protective devices so that they do not sustain extensive damage. This rating, called the Short-Circuit Current Rating (SCCR) of the device, is typically applied to components that do not provide overcurrent protection and are used in pow ...
Thermal Management of Electric Machines - MacSphere
... of techniques to a Switched Reluctance Machine and a high-speed Switched Reluctance Machine. Two novel concepts for said management of a Switched Reluctance Machine are proposed and developed: Inter-Laminate Cooling and a Continuous Toroidal Winding. The Inter-Laminate Cooling concept is developed w ...
... of techniques to a Switched Reluctance Machine and a high-speed Switched Reluctance Machine. Two novel concepts for said management of a Switched Reluctance Machine are proposed and developed: Inter-Laminate Cooling and a Continuous Toroidal Winding. The Inter-Laminate Cooling concept is developed w ...
An Alternating Magnetic Field System for Tracking
... containing the inner, distance-detecting winding (D in Fig. 2-4). The first, larger version is shown on the left (b). Initial testing demonstrated the usefulness of this transducer for making tiltindependent distance measurements with an accuracy of .5 mm. over a distance of 11-17 cm. (Perkell, 1982 ...
... containing the inner, distance-detecting winding (D in Fig. 2-4). The first, larger version is shown on the left (b). Initial testing demonstrated the usefulness of this transducer for making tiltindependent distance measurements with an accuracy of .5 mm. over a distance of 11-17 cm. (Perkell, 1982 ...
Protection guide - engineering site
... Fig. 1. Equivalent diagram of a power system with an earth fault. ...
... Fig. 1. Equivalent diagram of a power system with an earth fault. ...
Technical guide Protection criteria for medium voltage
... correct selection, it must be known which switching device and any relative protections are used on the secondary. Whereas measurement on the primary side for overloads and two- and threephase short-circuit provides precise indications regarding the type and position of the fault, in the case of a g ...
... correct selection, it must be known which switching device and any relative protections are used on the secondary. Whereas measurement on the primary side for overloads and two- and threephase short-circuit provides precise indications regarding the type and position of the fault, in the case of a g ...
Non-Regenerative DC Bus Supply Unit
... ATTENTION: The system may contain stored energy devices. To avoid the hazard of electrical shock, verify that all voltage on capacitors has been discharged before attempting to service, repair, or remove a drive system or its components. You should only attempt the procedures in this manual if you a ...
... ATTENTION: The system may contain stored energy devices. To avoid the hazard of electrical shock, verify that all voltage on capacitors has been discharged before attempting to service, repair, or remove a drive system or its components. You should only attempt the procedures in this manual if you a ...
60 kV to 500 kV Technical Interconnection Requirements
... confirming or endorsing the design or as warranting the safety, durability or reliability of the PGF. BC Hydro, by reason of such review or lack of review, shall be responsible for neither the strength, adequacy of design or capacity of equipment built pursuant to such specifications, nor shall BC H ...
... confirming or endorsing the design or as warranting the safety, durability or reliability of the PGF. BC Hydro, by reason of such review or lack of review, shall be responsible for neither the strength, adequacy of design or capacity of equipment built pursuant to such specifications, nor shall BC H ...
P6022 Current Probe Instruction Manual
... Probe Slide Switch — The slide switch on the probe has three positions: open, closed, and locked. Use your thumb to move the probe slide switch. The switch is spring-loaded so that it automatically moves from the open to closed positions. To Use the Probe: a. Pull the slide switch toward you and hol ...
... Probe Slide Switch — The slide switch on the probe has three positions: open, closed, and locked. Use your thumb to move the probe slide switch. The switch is spring-loaded so that it automatically moves from the open to closed positions. To Use the Probe: a. Pull the slide switch toward you and hol ...
Sensorless Start-up and Control of Permanent Magnet Synchronous
... With the increasing demand for oil and gas production, oil and gas companies start to step out into deeper waters with continuously increasing pump ratings. Due to these, start-up of subsea pump motors with long tieback distance and high breakaway torque becomes more and more relevant. Lack of suffi ...
... With the increasing demand for oil and gas production, oil and gas companies start to step out into deeper waters with continuously increasing pump ratings. Due to these, start-up of subsea pump motors with long tieback distance and high breakaway torque becomes more and more relevant. Lack of suffi ...
... system are shown in Figures 8.2-201 and 8.2-202 respectively. The common 500 kV/230 kV switchyard provides a 500 kV circuit feed to the main step-up transformer of each unit. The two reserve auxiliary transformers for each unit are provided with separate 230 kV circuit feeds. A 500kV/230 kV step dow ...
Information and Requirements for Electrical Service
... This April 2010 edition of the Specifications for Electrical Installations is effective as of June 2010. These specifications consolidate and replace both the “Electric System Bulletin No. 750” and “Information and Requirements for Electric Service—Green Book” and are in effect for the following Nat ...
... This April 2010 edition of the Specifications for Electrical Installations is effective as of June 2010. These specifications consolidate and replace both the “Electric System Bulletin No. 750” and “Information and Requirements for Electric Service—Green Book” and are in effect for the following Nat ...
Wide Speed Range Operation of Concentrated Winding Interior
... geometry is conducted. Two Dimensional Finite Element Method (2D-FEM) is used to simulate the impact of geometric design changes on motor operation. In order to increase the voltage applied to each phase of the machine and extend the operating region, an IPMSM is modeled in an open winding structure ...
... geometry is conducted. Two Dimensional Finite Element Method (2D-FEM) is used to simulate the impact of geometric design changes on motor operation. In order to increase the voltage applied to each phase of the machine and extend the operating region, an IPMSM is modeled in an open winding structure ...
PowerVac Switchgear Application Guide
... A single rollout in “A” or “B” compartment will be located as shown in the third view. A fused rollout in “A” compartment is available as bus connected only. The upper rollout in “A” compartment can be bus connected as long as the lower rollout n “A” compartment is bus connected. The lower rollout i ...
... A single rollout in “A” or “B” compartment will be located as shown in the third view. A fused rollout in “A” compartment is available as bus connected only. The upper rollout in “A” compartment can be bus connected as long as the lower rollout n “A” compartment is bus connected. The lower rollout i ...
S31115120
... proposed by Depenbrock for high power applications [4]. It is also known that DTC drive is less sensitive to parameters de-tuning (only stator resistor is used to estimate the stator flux) and provides a high dynamic performances. This type of command involves nonlinear controller type hysteresis, f ...
... proposed by Depenbrock for high power applications [4]. It is also known that DTC drive is less sensitive to parameters de-tuning (only stator resistor is used to estimate the stator flux) and provides a high dynamic performances. This type of command involves nonlinear controller type hysteresis, f ...
Electric Shock Hazard of Manual Electric Arc Welding
... at high level. Otherwise, even a slight electric shock may cause the welding worker to lose balance and fall down. ...
... at high level. Otherwise, even a slight electric shock may cause the welding worker to lose balance and fall down. ...
A SERIES-PARALLEL RESONANT TOPOLOGY AND NEW GATE DRIVE CIRCUITS FOR LOW
... (ICs) bring huge challenge to design the power supplies. Fast loop response is required to handle the high transient current of devices. Power solution size is demanded to reduce due to the size reduction of integrated circuits. The best way to meet these harsh requirements is to increase switching ...
... (ICs) bring huge challenge to design the power supplies. Fast loop response is required to handle the high transient current of devices. Power solution size is demanded to reduce due to the size reduction of integrated circuits. The best way to meet these harsh requirements is to increase switching ...
17 Generator and Generator Transformer Protection
... In the more usual case of a generator that operates in parallel with others and which forms part of an extensive interconnected system, back-up phase fault protection for a generator and its transformer will be provided by HV overcurrent protection. This will respond to the higherlevel backfeed fro ...
... In the more usual case of a generator that operates in parallel with others and which forms part of an extensive interconnected system, back-up phase fault protection for a generator and its transformer will be provided by HV overcurrent protection. This will respond to the higherlevel backfeed fro ...
Reference Guide The Open Distribution System Simulator
... Neither the name of the Electric Power Research Institute, Inc., nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY Electric Power Research Institute, Inc., "AS IS" ...
... Neither the name of the Electric Power Research Institute, Inc., nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY Electric Power Research Institute, Inc., "AS IS" ...
Transformer
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Commonly, transformers are used to increase or decrease the voltages of alternating current in electric power applications.A varying current in the transformer's primary winding creates a varying magnetic flux in the transformer core and a varying magnetic field impinging on the transformer's secondary winding. This varying magnetic field at the secondary winding induces a varying electromotive force (EMF) or voltage in the secondary winding. Making use of Faraday's Law in conjunction with high magnetic permeability core properties, transformers can thus be designed to efficiently change AC voltages from one voltage level to another within power networks.Since the invention of the first constant potential transformer in 1885, transformers have become essential for the transmission, distribution, and utilization of alternating current electrical energy. A wide range of transformer designs are encountered in electronic and electric power applications. Transformers range in size from RF transformers less than a cubic centimeter in volume to units interconnecting the power grid weighing hundreds of tons.