Understanding Power Quality
... As more electronic equipment is used in industry and commerce, harmonics have become a major power quality problem – more harmonics are generated, and more equipment is adversely affected by these harmonics A combination of good design practice and effective harmonic mitigation measures is required ...
... As more electronic equipment is used in industry and commerce, harmonics have become a major power quality problem – more harmonics are generated, and more equipment is adversely affected by these harmonics A combination of good design practice and effective harmonic mitigation measures is required ...
Complete Technical Specifications
... • Indoors or outdoors in Division 2 areas such as petroleum refineries, chemical and petrochemical plants, and other process industry facilities • Where high voltage supply must be stepped down to the lower voltage necessary to serve lighting, heating, appliance, heat tracing, motor and similar circ ...
... • Indoors or outdoors in Division 2 areas such as petroleum refineries, chemical and petrochemical plants, and other process industry facilities • Where high voltage supply must be stepped down to the lower voltage necessary to serve lighting, heating, appliance, heat tracing, motor and similar circ ...
Distribution Dry-Type Transformers — Low Voltage
... using three sets of coils for a threephase load, the transformer uses only two sets of coils. Series/multiple winding: A winding consisting of two or more sections that can be connected for series operation or multiple (parallel) operation. Also called series-parallel winding. Short circuit: A low r ...
... using three sets of coils for a threephase load, the transformer uses only two sets of coils. Series/multiple winding: A winding consisting of two or more sections that can be connected for series operation or multiple (parallel) operation. Also called series-parallel winding. Short circuit: A low r ...
Symmetrical Synchronous Machine per phase machine inductance
... sides a 4 , b4 , and c 4 are connected together to form the wye-connected stator. Each coil consists of nc conductors, each of which makes up an individual single conductor coil within the main coil. Thus the number of turns of each winding is determined by the product of nc and the number of coil ...
... sides a 4 , b4 , and c 4 are connected together to form the wye-connected stator. Each coil consists of nc conductors, each of which makes up an individual single conductor coil within the main coil. Thus the number of turns of each winding is determined by the product of nc and the number of coil ...
STATCOM
... terminals, respectively. The complete STATCOM control system scheme implemented on EMTP/ATP is shown in Fig. 5. The line currents (compensation currents) are measured and ...
... terminals, respectively. The complete STATCOM control system scheme implemented on EMTP/ATP is shown in Fig. 5. The line currents (compensation currents) are measured and ...
lecture notes on electrical technology –r15
... with field coils, a current must flow in the coils to generate the field, otherwise no power is transferred to or from the rotor. The process of generating a magnetic field by means of an electric current is called excitation. For a machine using field coils, which is most large generators, the fiel ...
... with field coils, a current must flow in the coils to generate the field, otherwise no power is transferred to or from the rotor. The process of generating a magnetic field by means of an electric current is called excitation. For a machine using field coils, which is most large generators, the fiel ...
MAX13253 Evaluation Kit Evaluates: MAX13253 General Description Features and Benefits
... from a single 3.0V to 5.5V supply and the on-board 1CT:1.3CT turns-ratio transformer sets the output voltage. The EV kit provides up to 90% overall efficiency at 5V with up to 4.5W output power using a push-pull isolated DC-DC converter. Undervoltage lockout, current limiting, and thermal shutdown p ...
... from a single 3.0V to 5.5V supply and the on-board 1CT:1.3CT turns-ratio transformer sets the output voltage. The EV kit provides up to 90% overall efficiency at 5V with up to 4.5W output power using a push-pull isolated DC-DC converter. Undervoltage lockout, current limiting, and thermal shutdown p ...
Is-limiter The world fastest limiting and switching device
... able to carry a high rated current but having a low switching capacity, and a high rupturing capacity (HRC) fuse arranged in parallel. In order to achieve the desired short opening time, a small charge is used as the energy store for opening of the switch (main conductor). When the main conductor is ...
... able to carry a high rated current but having a low switching capacity, and a high rupturing capacity (HRC) fuse arranged in parallel. In order to achieve the desired short opening time, a small charge is used as the energy store for opening of the switch (main conductor). When the main conductor is ...
Technical Spec. of 315 KVA DTRs
... 9.3. LOSSES AND IMPEDANCE: The maximum losses and impedance for various ratings of transformers of 11KV class should be as shown below. ...
... 9.3. LOSSES AND IMPEDANCE: The maximum losses and impedance for various ratings of transformers of 11KV class should be as shown below. ...
Overview of Dynamic Voltage Restorer (DVR) for Power Quality
... and voltage available to industrial, commercial and household consumers of electricity. The problem regards both the utilities and customers. For the utilities, to provide adequate power quality is a moving objective because of changes in user equipment and requirements. For consumers, problems stem ...
... and voltage available to industrial, commercial and household consumers of electricity. The problem regards both the utilities and customers. For the utilities, to provide adequate power quality is a moving objective because of changes in user equipment and requirements. For consumers, problems stem ...
EDS 04-8000A Grid Transformer Schedules
... The works shall be carried out and completed in accordance with the Contract completion date stated below. The Contractor shall submit a Plant Manufacture, Delivery and Erection Programme for the approval of the Engineer. Three copies of the above mentioned Programme shall be provided by the Contrac ...
... The works shall be carried out and completed in accordance with the Contract completion date stated below. The Contractor shall submit a Plant Manufacture, Delivery and Erection Programme for the approval of the Engineer. Three copies of the above mentioned Programme shall be provided by the Contrac ...
Improving the Full-bridge Phase-shift ZVT Converter
... have been widely employed in the industrial arc welding field. The more than three orders of magnitude increase in operating frequency, from the 50/60Hz phase-controlled equipment of the sixties to the now commonplace 50-100kHz SMPS designs, has permitted substantial reductions in weight and size, e ...
... have been widely employed in the industrial arc welding field. The more than three orders of magnitude increase in operating frequency, from the 50/60Hz phase-controlled equipment of the sixties to the now commonplace 50-100kHz SMPS designs, has permitted substantial reductions in weight and size, e ...
PDF
... This specification covers the electrical and mechanical characteristics of Eaton’s Cooper Power series 45-10,000 kVA Three-Phase Step-Down Pad-Mounted Distribution Transformers. KVA ratings for transformers with secondary voltages not exceeding 700V are 45-3,750 kVA, while kVA ratings for transforme ...
... This specification covers the electrical and mechanical characteristics of Eaton’s Cooper Power series 45-10,000 kVA Three-Phase Step-Down Pad-Mounted Distribution Transformers. KVA ratings for transformers with secondary voltages not exceeding 700V are 45-3,750 kVA, while kVA ratings for transforme ...
question bank - SIETK ECE Dept
... 7. (a) A 550 V, 55 KVA single phase alternator has an effective resistance of 0.2Ω. A field current of 10A produces an armature current of short circuit and an emf of 450 V of open circuit. calculate i)synchronous impedance and reactance ii) full load regulation when the power factor is 0.8 lagging. ...
... 7. (a) A 550 V, 55 KVA single phase alternator has an effective resistance of 0.2Ω. A field current of 10A produces an armature current of short circuit and an emf of 450 V of open circuit. calculate i)synchronous impedance and reactance ii) full load regulation when the power factor is 0.8 lagging. ...
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.