Practical Aspects of Rogowski Coil Applications to Relaying
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Mutual Inductance and Transformer Theory Questions: 1 Through 15 Lab Exercise: Transformer Voltage/Current Ratios (Question 61)
ELTR 115 (AC 2), section 1 Recommended schedule Day 1 Topics: Mutual inductance and transformer theory Questions: 1 through 15 Lab Exercise: Transformer voltage/current ratios (question 61) Day 2 Topics: Transformer step ratio Questions: 16 through 30 Lab Exercise: Auto-transformers (question 62) Day 3 Topics: Maximum power transfer theorem and impedance matching with transformers Questions: 31 through 45 Lab Exercise: Auto-transformers (question 63) Day 4 Topics: Transformer applications, power ratings, and core effects Questions: 46 through 60 Lab Exercise: Differential voltage measurement using the oscilloscope (question 64) Day 5 Exam 1: includes Transformer voltage ratio performance assessment Lab Exercise: work on project Project: Initial project design checked by instructor and components selected (sensitive audio detector circuit recommended) Practice and challenge problems Questions: 66 through the end of the worksheet Impending deadlines Project due at end of ELTR115, Section 3 Question 65: Sample project grading criteria 1 ELTR 115 (AC 2), section 1 Project ideas AC power supply: (Strongly Recommended!) This is basically one-half of an AC/DC power supply circuit, consisting of a line power plug, on/off switch, fuse, indicator lamp, and a step-down transformer. The reason this project idea is strongly recommended is that it may serve as the basis for the recommended power supply project in the next course (ELTR120 – Semiconductors 1). If you build the AC section now, you will not have to re-build an enclosure or any of the line-power circuitry later! Note that the first lab (step-down transformer circuit) may serve as a prototype for this project with just a few additional components. -
Electricity Today Issue 4 Volume 17, 2005
ET_4_2005 6/3/05 10:41 AM Page 1 A look at the upcoming PES IEEE General Meeting see page 5 ISSUE 4 Volume 17, 2005 INFORMATION TECHNOLOGIES: Protection & Performance and Transformer Maintenance PUBLICATION MAIL AGREEMENT # 40051146 Electrical Buyer’s Guides, Forums, On-Line Magazines, Industry News, Job Postings, www.electricityforum.com Electrical Store, Industry Links ET_4_2005 6/3/05 10:41 AM Page 2 CONNECTINGCONNECTING ...PROTECTING...PROTECTING ® ® ® HTJC, Hi-Temperature Joint Compound With a unique synthetic compound for "gritted" and "non-gritted" specifications, the HTJC high temperature "AA" Oxidation Inhibitor improves thermal and electrical junction performance for all connections: • Compression Lugs and Splices for Distribution and Transmission • Tees, Taps and Stirrups on any conductor • Pad to Pad Underground, Substation and Overhead connections For oxidation protection of ACSS class and other connector surfaces in any environment (-40 oC to +250 oC), visit the Anderson ® / Fargo ® connectors catalogue section of our website www.HubbellPowerSystems.ca Anderson® and Fargo® offer the widest selection of high performance inhibitor compounds: Hubbell Canada LP, Power Systems TM ® ® 870 Brock Road South Inhibox , Fargolene , Versa-Seal Pickering, ON L1W 1Z8 Phone (905) 839-1138 • Fax: (905) 831-6353 www.HubbellPowerSystems.ca POWER SYSTEMS ET_4_2005 6/3/05 10:41 AM Page 3 in this issue Publisher/Executive Editor Randolph W. Hurst [email protected] SPECIAL PREVIEW Associate Publisher/Advertising Sales 5 IEEE PES General Meeting has -
LTC3723-1/LTC3723-2 Synchronous Push-Pull PWM Controllers
LTC3723-1/LTC3723-2 Synchronous Push-Pull PWM Controllers FEATURES DESCRIPTIO U ■ High Efficiency Synchronous Push-Pull PWM The LTC®3723-1/LTC3723-2 synchronous push-pull PWM ■ 1.5A Sink, 1A Source Output Drivers controllers provide all of the control and protection func- ■ Supports Push-Pull, Full-Bridge, Half-Bridge, and tions necessary for compact and highly efficient, isolated Forward Topologies power converters. High integration minimizes external ■ Adjustable Push-Pull Dead-Time and Synchronous component count, while preserving design flexibility. Timing The robust push-pull output stages switch at half the ■ Adjustable System Undervoltage Lockout and Hysteresis oscillator frequency. Dead-time is independently pro- ■ Adjustable Leading Edge Blanking grammed with an external resistor. Synchronous rectifier ■ Low Start-Up and Quiescent Currents timing is adjustable to optimize efficiency. A UVLO pro- ■ Current Mode (LTC3723-1) or Voltage Mode gram input provides precise system turn-on and turn off (LTC3723-2) Operation voltages. The LTC3723-1 features peak current mode ■ Single Resistor Slope Compensation control with programmable slope compensation and lead- ■ ing edge blanking, while the LTC3723-2 employs voltage VCC UVLO and 25mA Shunt Regulator ■ Programmable Fixed Frequency Operation to 1MHz mode control with voltage feedforward capability. ■ 50mA Synchronous Output Drivers The LTC3723-1/LTC3723-2 feature extremely low operat- ■ Soft-Start, Cycle-by-Cycle Current Limiting and ing and start-up currents. Both devices provide reliable Hiccup Mode Short-Circuit Protection short-circuit and overtemperature protection. The ■ 5V, 15mA Low Dropout Regulator LTC3723-1/LTC3723-2 are offered in a 16-pin SSOP ■ Available in 16-Pin SSOP Package package. -
Janitza Rogowski Coils & Measurement Transducer
Smart Energy & Power Quality Solutions Rogowski current transformer and measurement transducer ROGOWSKI CURRENT TRANSFORMER AND MEASUREMENT TRANSDUCER Smart Energy & Power Quality Solutions Rogowski current transformer and measurement transducer The Rogowski coil principle The Rogowski measuring principle is a special form of The alternating current in the line that is to be measured transformational current measurement of sinusoidal and induces a voltage in the Rogowski coil, which is non-sinusoidal alternating currents. proportional to the phase current. The Rogowski coil operates in a pronounced linear manner, even with high The Rogowski coil is a patented, iron-free induction or rapidly changing currents. As such, this type of sensor coil (air coil). In order to attain ideal accuracy, this air is particularly well suited for energy measuring systems coil should be almost completely closed. This has been that are exposed to high or rapidly changing currents. achieved through the patented connection technology. Furthermore, the Rogowski coil offers the advantages of compact size and simple installation. Record harmonics and transients with phase Speed because load changes are immediately precision detected and so drop-outs and process interruptions can be prevented Flexible Rogowski current transformer suitable for retrofitting Simple operation also with large cable diameters – space-saving, compact and handy Alternating currents from 1-4000 A can be recorded with just one variant High system availability through simple installation without removing system parts Rogowski current transformers with measurement transducer can be used together with all Janitza Sits securely on power rails and round conductors UMGs* thanks to professional fastening Install and operate safely * Not in combination with the UMG 20CM The Rogowski coil is a helical wire coil. -
THE ULTIMATE Tesla Coil Design and CONSTRUCTION GUIDE the ULTIMATE Tesla Coil Design and CONSTRUCTION GUIDE
THE ULTIMATE Tesla Coil Design AND CONSTRUCTION GUIDE THE ULTIMATE Tesla Coil Design AND CONSTRUCTION GUIDE Mitch Tilbury New York Chicago San Francisco Lisbon London Madrid Mexico City Milan New Delhi San Juan Seoul Singapore Sydney Toronto Copyright © 2008 by The McGraw-Hill Companies, Inc. All rights reserved. Manufactured in the United States of America. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. 0-07-159589-9 The material in this eBook also appears in the print version of this title: 0-07-149737-4. All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. Where such designations appear in this book, they have been printed with initial caps. McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs. For more information, please contact George Hoare, Special Sales, at [email protected] or (212) 904-4069. TERMS OF USE This is a copyrighted work and The McGraw-Hill Companies, Inc. (“McGraw-Hill”) and its licensors reserve all rights in and to the work. Use of this work is subject to these terms. Except as permitted under the Copyright Act of 1976 and the right to store and retrieve one copy of the work, you may not decompile, disassemble, reverse engineer, reproduce, modify, create derivative works based upon, transmit, distribute, disseminate, sell, publish or sublicense the work or any part of it without McGraw-Hill’s prior consent. -
Instruction Manual Installation Operation Copyright © 2012 Kato Engineering, Inc
Instruction Manual Installation Operation Copyright © 2012 Kato Engineering, Inc. All rights reserved Maintenance Motor-Generator Set Synchronous Common Shaft Publication 350-03006-00 (07/18/2012) Kato Engineering, Inc. | P.O. Box 8447 | Mankato, MN USA 56002-8447 | Tel: 507-625-4011 [email protected] | www.KatoEngineering.com | Fax: 507-345-2798 Copyright © 2012 Kato Engineering, Inc. All rights reserved Page 1 Table of Contents Introduction............................................................................... 4 Foreword..................................................................................... 4 Safety instructions.......................................................................4 Ratings/description......................................................................4 Construction and Operating Principles.................................. 5 Stator...........................................................................................5 Rotor........................................................................................... 5 Brushless exciters....................................................................... 6 Installation................................................................................. 7 Receiving inspection................................................................... 7 Unpacking and moving............................................................... 7 Location...................................................................................... 7 Mounting.................................................................................... -
Current Transformer Theory & Testing
Current Transformer Theory & Testing Hands On Relay School 2016 Jay Anderson – Omicron [email protected] www.OmicronEnergy.com Agenda • Introduction • Current Transformer Basics • Construction & Types • Industry Standards • Applications • Testing Current Transformer Basics © OMICRON Page 3 Function of Current Transformers • Convert Primary Power Signals to Manageable Values for • Indicating Meters • Revenue Metering • Protective Relay Systems • Power Generation • Plant Monitoring Systems • Fault Recorders • SCADA • Overall Electric Grid Monitoring (Local Dispatch & ISO Level) • Building (Energy) Management Systems (HVAC,refrigeration...) • Load Control January 19, 2016 Page: 4 Current Transformers • Insulation from High Voltages and Currents • Isolation from other systems • Safety • Standardization • Accuracy ( Ratio & Phase) • Typically Low Power Rating • Thermal Considerations • Burden Considerations January 19, 2016 Page: 5 Current Transformers • Insulation Consistent With Voltage Use • Wide Range of Current to Replicate (Unlike VTs) • Metering or Protective Class Ratings • Typically Unprotected • Dangerous When Open Circuited January 19, 2016 Page: 6 Compliance & Standards Instrument Transformers Are Expected to Perform & Conform IEEE ANSI IEC in Europe & Asia NERC Reliability Standards in US Supported standards • IEEE C57.13 standard requirements for instrument transformers • IEEE C57.13.6 standard for high-accuracy instrument transformers • IEC 60044-1 current transformers • IEC 60044-6 requirements for protective current -
Type VRLTC™ Load Tap Changer
Technical guide Type VRLTC™ load tap changer Table of contents 2 General information 4 Switching sequences 6 Tank characteristics 6 Terminal board 7 Tap selector 7 Stationary contacts 7 Reversing switch or change over selector 8 Drive shaft 8 By-pass switch and vacuum interrupter mechanism 10 Current detector module 11 Motor drive enclosure 12 Digital servo motor system 13 Decision making and monitoring 14 Maintenance and inspection features 14 Service recommendations 15 Mechanical components 15 Electrical engineering information 16 Type tests 17 Notes Technical guide | VRLTC load tap changer 01 General information ABB designed, developed and will manufacture the type VRLTC The drive motor is a digitally controlled servo motor which load tap changer (LTC) at its facility in Alamo, Tennessee. The precisely responds to the commands from the digital drive. LTC meets all of the required specifications according to IEEE Cam switches and electromechanical relays are not used in this C57.131 and IEC 60214. The LTC is an on-tank, vacuum tap changer. The entire system is monitored and controlled reactance type suitable for either automatic or manual control. by the Tap Logic Monitoring System (TLMS™) mounted in the motor compartment. Three major components make up the LTC: the tap changing components, the driving components, and the decision making/ The components of the tap changing circuit are: monitoring components. The tap changing components are — The preventive autotransformer - a separate device mounted contained in an oil-filled steel tank. The transformer’s tap leads inside the transformer which provides the switching impedance and preventive autotransformer (PA or switching reactor) leads — The tap changing module - consists of the tap selector and are connected to the back of the LTC terminal board. -
Distribution Transformers–Medium and High Voltage Section 21
Distribution Transformers–Medium and High Voltage Section 21 com . Secondary Substation – SST .....................................................21-2 Three-phase Padmounted – PADS ..........................................21-4 Single-Phase Pole-Mounted – POLES......................................21-6 Network Transformers ..............................................................21-9 Voltage Regulators VR-1 .............................................................................................................21-10 Bushing Potential Devices......................................................21-13 ElectricalPartManuals . Publications and Reference: See Section 22 for a complete list of additional product-related publications Rev. 1/08 ® 21-1 Prices and data subject www.geelectrical.com BuyLog Catalog wwwto change without notice Distribution Transformers–Medium and High Voltage Section 21 GE-PROLEC® Liquid Filled Secondary Substation Transformers-SST GE-PROLEC® Secondary Substation Transformers will meet all of your industrial applications for power distribution. These transformers have a robust construction and are designed with the capability to coordinate with a wide diversity of equipment such as switchboards, LIS, MCCs, etc. com Applications Industrial . —Oil and Gas —Chemical Industry —Paper Industry —Steel Industry —Cement Industry Commercial —Airports —Stadiums —Office Building —Waste Water General Construction Features —Stores —The liquid insulated, secondary type substation transformer Utility is designed, manufactured -
Failure Analysis of a Power Transformer Using Dissolved Gas Analysis – a Case Study
IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 FAILURE ANALYSIS OF A POWER TRANSFORMER USING DISSOLVED GAS ANALYSIS – A CASE STUDY Ankush Chander1 Nishant2 1M. Tech Scholar, EEE Department Arni University Indora Himachal Pradesh, India 2Assistant Professor, EEE Department, Arni University Indora Himachal Pradesh, India Abstract Reliable and continued performance of power Transformer is the key to profitable generation and transmission of electric power. Failure of a large power transformer not only results in the loss of very expensive equipment, but it can cause significant guarantied damage as well. Replacement of that transformer can take up to a year if the failure is not disastrous and can result in tremendous revenue losses and fines. A Power Transformer in operation is subjected to various stresses like thermal stress and electrical stress, resulting in liberation of gases from the hydrocarbon mineral oil which is used as insulant and coolant. Dissolved Gas Analysis is a technique used to assess incipient faults of the transformer by analyzing specific dissolved gas concentrations arising from the deterioration of the transformer. DGA is used not only as a diagnostic tool but also to track apparatus failure. In this case study the fault and defects that occurred in 400kV/220kV/132kV/66kV Sub Station can be found by DGA. Keywords: Power Transformer, Dissolved Gas Analysis, ----------------------------------------------------------------------***---------------------------------------------------------------------- 1. INTRODUCTION Table 2.1 Failure Mode of Transformer A power transformer is one of the most important and costly Description Failures Duration devices in electrical systems. Its importance is attributed No % TTF ATF directly to the continuity of power supply, since its loss through failure or defect means a supply stoppage. -
Application Notes
APPLICATION NOTES Contents 1. The Basics …….…2 1.1 What is a Rogowski current transducer? …….…2 1.2 How does a Rogowski current transducer work? …….…2 1.3 What are the advantages of Rogowski current transducers? …….…3 1.4 How does a Rogowski transducer compare to a Current Transformer? …….…3 2. Frequency Response – measuring sinusoids, quasi sinusoids and pulses …….…4 2.1 What is the typical frequency response of a Rogowski current transducer? …….…4 2.2 What determines high frequency (-3dB) bandwidth of Rogowski current …….…4 transducers? 2.2.1 Phase shift and attenuation of sinusoidal currents from kHz to MHz …….…4 2.2.2 Measuring fast switching transients (sub ms) …….…6 2.3 What determines the low frequency (-3dB) bandwidth of Rogowski current …….…7 transducers? 2.3.1 Phase shift, small currents and low frequency noise …….…7 2.3.2 Measuring long (ms to 100’s ms) pulses of current and the droop effect …….…8 3. Accuracy .…..…10 3.1 How do PEM calibrate their transducers (and to what standards)? ……...10 3.2 Linearity ……...11 3.3 Positional accuracy ……...11 3.4 The effect of external currents and voltages external to the Rogowski loop ……...12 3.5 Temperature ……...12 4. Peak currents, overloads and saturation .…..…13 4.1 Peak current ………13 4.2 RMS current ………14 4.3 Peak di/dt ………14 4.4 Absolute maximum di/dt (peak) ………14 4.5 Absolute maximum di/dt (rms) ………14 5. Output cabling and loading ………15 6. How do PEM rate the voltage insulation of their Rogowski coils? ………16 6.1 What advice do PEM have for customers using Rogowski coils continuously at ………16 high voltage 7. -
W.E.F. : 2016-2017
R.V.R. & J.C. College of Engineering (Autonomous) R-16 R V R & J C COLLEGE OF ENGINEERING, CHOWDAVARAM, GUNTUR-19 (Autonomous) R-16 REGULATIONS & SCHEME CHOICE BASED CREDIT SYSTEM Regulations, Scheme of Instruction, Examination and Detailed Syllabi for 4-Year B.Tech Degree Course in Electrical & Electronics Engineering (Semester System) w.e.f. : 2016-2017 B.Tech.(EEE)/R-16/2016-2017 Page 1 of 187 R.V.R. & J.C. College of Engineering (Autonomous) R-16 EEE Department Vision: “To impart education leading to highly competent professionals in the field of Electrical & Electronics Engineering who are globally competent and to make the Department a Centre for Excellence”. EEE Department Mission: “Integrated development of professionals with knowledge and skills in the field of specialization, ethics and values needed to be employable in the field of Electrical Engineering and contribute to the economic growth of the employing organization and pursue lifelong learning” Program Educational Objectives of B. Tech Program in Electrical & Electronics Engineering: PEO I. To facilitate the students to become Electrical & Electronics Engineers who are competent, innovative and productive in addressing the broader interests of the organizations & society. PEO II. To prepare the students to grow professionally with necessary soft skills. PEO III. To make our graduates to engage and excel in activities to enhance knowledge in their professional works with ethical codes of life & profession. Program Specific Outcomes of B. Tech Program in Electrical & Electronics Engineering: PSO1 Graduates of the program will be able to demonstrate knowledge and hands on competence in developing, Testing, Operation and Maintenance of Electrical & Electronics systems.