Suppressing Transients: A New Approach
|
|
- Roland Mathews
- 6 years ago
- Views:
Transcription
1 Page 1 of 5 Suppressing Transients: A New Approach By Rudy T. Wodrich and Tommy Mok, Schneider Electric, Bramalea, Ontario, Canada Power Quality, Apr 1, 2001 For years, transients generated on the utility grid have plagued industrial and commercial facilities with a high concentration of variable-speed drives (VSDs) and other sensitive loads. The common sources of transients include transfer switch operation, lightning strikes, and utility-level capacitor switching. These transients cause sensitive equipment to trip on momentary overvoltages and result in substantial losses in productivity. The most common source of transients is utility switching of medium- and highvoltage capacitors for voltage regulation and power factor correction. The traditional method of protecting VSD loads from utility-side transients involves installing line reactors in series with the VSD. The purpose of this practice is to increase line impedance and limit the transient at the drive terminals. In many cases, however, the end user installs the line reactors and discovers the problem has been lessened but not eliminated. Traditional surge protection devices (SPDs) employing metal-oxide varistors (MOVs) protect against high per-unit transients, such as those created by lightning, but they will not protect VSDs from capacitor-switching transients. For example, SPDs will typically limit transients to 1.8 per unit to 2.0 per unit, but small drives will trip at 1.3 to 1.4 per-unit overvoltages. Typical silicon-controlled rectifiers (SCRs) used in industrial environments may have only a 1.75 per-unit withstand capability (i.e.,1200v peak inverse voltage (PIV) rating) before they suffer permanent damage. Recently, a new approach addressing the problem of capacitor-switching transients has been developed. The device, called the zero threshold surge suppressor (ZTSS), employs a passive diode bridge and electrolytic capacitors to shunt transient energy away from sensitive equipment. Unlike traditional SPDs, which technicians install in layers (e.g., main switchboard, subpanel, motor control center, sensitive load), only one ZTSS unit is required to protect an entire low-voltage substation service. The ZTSS is not MOV-based, so it will not degrade over time as multiple transients are suppressed. It can typically limit capacitor-switching transients to 1.2 per unit or less, effectively protecting VSD loads downstream of the device. Because MOV characteristics are unsuitable for protecting small drives, a suppressor with a lower voltage characteristic is necessary. The ZTSS is designed to reduce the voltage spike below the overvoltage trip level of the adjustable-speed motor drives. It is a capacitor-based, phase-to-phase surge suppressor, and the suppressed spike amplitude is dependent on the time constant of the ZTSS's R/C circuit. Design Fundamentals The ZTSS consists of a 3-phase diode rectifier bridge and a DC capacitor bank (see Figure, on page 32). The circuit doesn't require a wye-connected secondary, and the diode bridge's peak output DC voltage is the peak line voltage of the supply. The capacitor bank consists of a number of resistors and
2 Page 2 of 5 capacitors that connect in parallel with each R/C leg protected by dual-element, time-delay fuses. In practice, when the utility switches its power factor correction capacitors, the voltage on the line will fall first, followed by a sudden rise in voltage. This process repeats itself until the system settles down within one-half cycle. The ZTSS absorbs the sudden change of the incoming high energy by charging and discharging the capacitors. The capacitors' rate of charge and discharge depends on the time constant of the R/C circuit. The time constant of the R/C circuit is defined as the time required for the charge on the capacitor to attain 63.21% of its final value. Therefore, the critical design parameters of the ZTSS are the time constant of the R/C circuit and the total value of capacitance (in microfarads) contained in the ZTSS system. The total capacitance of the ZTSS determines the energy dissipation limitations of the device and must be determined by the actual energy contained in the transient measured at the customer's site. Compared to traditional transient voltage surge suppression (TVSS) systems, there are some distinct differences with the ZTSS solution, as summarized in Table 1. The ZTSS's design attempts to provide sufficient suppression for most electrical networks. Designs are available for 208V, 400V, 480V, and 600V networks. However, some instances may require personnel to conduct site measurements and/or alternative transient program (ATP) simulations to ensure an appropriate ZTSS design for suppression of the available transient. Economic Considerations The economic validity of the ZTSS solution depends on a number of factors, including the number of drives requiring protection and their horsepower ratings, the cost and length of downtime as a result of drive trips, the cost of any scrap resulting from drive trips, and the installation complexity of alternative solutions, such as TVSS or line reactors. Excluding installation charges, line reactors for 10 hp drives cost approximately $150, while TVSS systems cost between $3,000 and $5,000. TVSS systems must be installed in layers, with one TVSS at the service entrance and another at each motor control center. Table 2, on page 36, compares the cost of the three types of solutions when trying to protect a 480V substation transformer with 30 VFDs (10 hp or less) connected to two subpanel motor control centers. In some applications, the ZTSS is preferable to line reactors because the cost of scrap and downtime for plastic film extrusion is high, and the process requires substantial time to restart. A ZTSS has a higher probability of protecting the load, and the logistics of retrofitting line reactors into existing drives may be cumbersome. On the other hand, if only a small number of drives need protecting, the series line reactor will likely be a more economically feasible solution. TVSS solutions, while crucial for protection from highmagnitude, high-energy transients, frequently won't protect small drives from relatively low-magnitude, capacitor-switching transients. To provide an even wider range of transient protection for sensitive applications, it may be worthwhile
3 Page 3 of 5 to investigate a hybrid unit employing both ZTSS and TVSS technologies. Conclusions Although we reviewed solutions for protecting sensitive equipment from utility capacitor-switching transients, we did not discuss the methods for suppressing the transient at its source. These methods include pre-insertion resistors or inductors, tuning reactors with each capacitor stage, electronic zeroclosing controls with vacuum switching devices, and solid-state switching of capacitor steps. While these methods provide some reduction of the transient, it is impractical to assume utilities can be convinced to alter their method of capacitor-switching control. The ZTSS is a capacitor-based design that acts just like a damper or a shock absorber. The ZTSS starts acting as soon as the spike exceeds the nominal voltage level. If properly designed for the application, it should protect sensitive downstream equipment from utility- or customer-generated, medium-voltage capacitor-switching transients. The ZTSS is suitable for facilities with a high concentration of sensitive drive loads and where the cost of downtime and scrap is high. Other advantages include its single point of installation and global protection scheme. Use of a ZTSS may eliminate the need to replace standard customer-owned, medium- or low-voltage capacitor banks to detuned or filter systems, as it can safely deal with the transient magnification that these banks often create. References 1. Allan Ludbrook, The Zero Threshold Surge Suppressor: PWM Drives and Capacitor Switching, Electricity Today, Vol. 5 No.4, April Stephen D. Boutiller, Mitigation of Magnified-Capacitor-Switching Transients, Canadian Electrical Association spring meeting, April 1992, Vancouver. 3. Van E. Wagner, Utility Capacitor Switching and Adjustable-Speed Drives, IEEE Transactions on Industry Applications, Vol. 27 No. 4, July/Aug Gary W. Chang, A Review on Solutions for Mitigating Utility Capacitor Switching Transients, Power Quality 1999 Proceedings, November Roger C. Dugan, Mark F. McGranaghan, and H. Wayne Beaty, Electrical Power Systems Quality, McGraw-Hill, Traditional Transient Solutions Transient voltage surge suppression (TVSS) also known as surge protection devices (SPDs) or surge suppressors is the most common solution designed to protect a facility against transients. Although similar, SPDs are not the same as lightning arresters or surge diverters. Lightning arresters are used to protect the utility's system and equipment rather than customers' sensitive electronic equipment. A lightning arrester consists of a resistance with series spark-gap devices connected between line and
4 Page 4 of 5 ground. This gap is usually set to break down at approximately a 50% overvoltage, and the lightning arrester does not begin to absorb the energy of the surge until the gap has actually flashed over. TVSS systems reduce or eliminate harmful transients, surges, and electrical line noise (Figure), thus preventing damage to sensitive electrical equipment. Many TVSS systems feature multiple parallel metal-oxide varistors (MOVs). As the voltage reaches the MOV's rated voltage level, the impedance of the MOV changes state, providing a low-impedance path for the transient to follow. This allows the excess energy to be diverted away from the protected load. However, when the MOV sustains an overvoltage or a large transient exceeding its capacity, it can go into a thermal avalanche or thermal runaway condition. This means the zinc oxide material of the MOV breaks down and initiates a short-circuit condition. The clamping characteristic of the MOV is too high to protect small pulse-width modulation (PWM), adjustable-speed drives from the 200%- andhigher voltage transients generated by utility-switched capacitor banks. A well-designed installation includes a lightning arrester, service entrance SPD, and downstream SPDs. This is the cascade protection scheme detailed in IEEE C By UL1449 definition, an SPD (or TVSS system) is a surge protection device intended for electrical connection on the load side of the main overcurrent protection, in circuits not exceeding 600V rms. Case Study A bearing manufacturing plant located in London, Ontario, Canada, experienced periodic equipment failures that coincided with the times the utility switched capacitor banks. Transient voltage waveforms showed the presence of a magnified capacitor-switching transient between 7 a.m. and 9:30 a.m. (Fig. 1). The 480V bus captured the waveform, which showed a spike of 1200V peak (1.77 per unit) when the utility energized the capacitor bank. The utility's 13.8kV distribution station supplies power to the plant, which owns a 1500kVAR-rated capacitor bank that was installed on this incoming 13.8kV bus. The plant has four main substations that step voltage down to the utilization level of 480V. Three of the four main substations have installed fixed-type power factor correction banks. Discussions with the customer revealed that overvoltage trips were occurring on most of the 1 hp drives from two to four times per day. Fuses in the lighting system and power transistors in the pulse-width modulated (PWM) drives also exhibited a high failure rate. To investigate potential solutions, network models were made using an alternative transient program (ATP). An ATP is the royalty-free version of the electromagnetic transients program (EMTP) and a widely used transient simulation program. The full 3-phase model included a minimum of 50% inductive load on the 480V bus, a ZTSS unit connected between phases at the 480V level, and a utility capacitor switch. Models of various capacitor sizes switched at both 13.8kV and 115kV were made to recreate the measured transient and determine a worst-case design scenario. The customer installed a ZTSS in the Grind Building seven years ago, and it proved to be effective at suppressing the incoming transient for that service. Based on the ATP simulations and site measurements, the customer installed a newly designed ZTSS in another substation (the screw machine building), and the transient waveforms were captured before and after the new unit's installation (Fig. 1 and Fig. 2).
5 Page 5 of 5 The transient on the screw machine building substation is now no greater than 1.30 per unit (the average is 1.14 per unit), compared to 1.77 per unit before the installation of the ZTSS, and drive trip problems have been eliminated. ATP simulations show that the new ZTSS unit (patent pending) is directly protecting the transient-sensitive equipment on the same bus and improving the transient magnitude on the line side of the substation by 10% to 30%. That means each ZTSS will assist in protecting the other substations next to the ZTSS-protected substation. 2003, Primedia Business Magazines and Media, a PRIMEDIA company. All rights reserved. This article is protected by United States copyright and other intellectual property laws and may not be reproduced, rewritten, distributed, redisseminated, transmitted, displayed, published or broadcast, directly or indirectly, in any medium without the prior written permission of PRIMEDIA Business Corp Primedia Business Magazines and Media. About Us Contact Us Advertising For Search P
SAMPLE. MOVs are sometimes referred
attenuate (weaken or reduce) a spike or transient pulse. Recall that in a capacitive circuit the voltage lags the current, and in an inductive circuit the current lags the voltage. Inductance added METAL-OXIDE
More informationWhite Paper. AC Surge Protection. Evaluation of Series Element Surge Protective Device for Protection of Electronic Equipment and Systems
White Paper AC Surge Protection Evaluation of Series Element Surge Protective Device for Protection of Electronic Equipment and Systems Richard Odenberg, Research & Advanced Applications, Founder of Transtector
More informationMitigation of Voltage Swells I
Mitigation of Voltage Swells I 3.2.1. Surge arresters and transient voltage surge suppressors Arresters and TVSS devices protect equipment from transient over voltages by limiting the maximum voltage,
More informationFundamentals of Thyristor Overvoltage Circuit Protection
Fundamentals of Thyristor Overvoltage Circuit Protection Thyristor Surge Protection Technology The Problem of Overvoltages Electronic components have been designed to function properly when used within
More informationglossary GE Digital Energy Power Quality Surge Protective Devices (SPDs)
GE Digital Energy Power Quality Surge Protective Devices (SPDs) glossary Active Tracking A term used to describe the ability of a filter to reduce frequency disturbances at a constant level with respect
More informationThe following standards are the basis of design, manufacture, and test of SPD equipment: Guide for Surge Voltages in Low-Voltage AC Power Circuits
ENGINEERING BULLETIN Manufacturing & Test Standards for SPDs APT SPD/TVSS are manufactured and tested in accordance with applicable industry standards. UL Marks are found on APT equipment. These are the
More informationQuantum Chargers Enhanced AC Line Transient Immunity
Introduction Quantum Chargers Enhanced AC Line Transient Immunity By: Nasser Kutkut, PhD, DBA Advanced Charging Technologies Inc. This white paper outlines the most common AC power quality disturbances
More informationTRI-SERVICE ELECTRICAL WORKING GROUP (TSEWG) 07/16/08 TSEWG TP-3: SURGE PROTECTOR PERFORMANCE AND EVALUATION CRITERIA
TSEWG TP-3: SURGE PROTECTOR PERFORMANCE AND EVALUATION CRITERIA SURGE PROTECTION DESIGN. Parallel Versus Series Protection. Surge protectors within the scope of this UFC should normally be of the parallel
More informationIntegrating Monitoring and Diagnostic Equipment on Aging Transformers
May 13-14, 2008 International Centre, Mississauga, Ontario April 2008 Volume 20, No. 3 Integrating Monitoring and Diagnostic Equipment on Aging Transformers Valuable information on maintaining critical
More informationPOWER QUALITY (UNIT-3) ELECTRICAL TRANSIENT:
POWER QUALITY (UNIT-3) ELECTRICAL TRANSIENT: Transients are disturbances that occur for a very short duration (less than a cycle), and the electrical circuit is quickly restored to original operation provided
More informationAC Line Voltage Transients and Their Suppression
AC Line Voltage Transients and Their Suppression Application Note January 1998 AN9308.2 [ /Title (AN93 08) /Subject (AC Line Voltage Transients and Their Suppression) /Autho r () /Keywords (TVS, Transient
More informationDesigning with Thermally Protected TCMOV Varistors for Type 1 and Type 2 UL1449 3rd Edition Applications
TCMOV Varistors for Type 1 and Type What is UL 1449? Underwriters Laboratories standard UL 1449 has become the primary safety standard for surge protective devices (SPDs). It describes the materials and
More informationENGR. MARITES R. PANGILINAN, P.E.E.
ENGR. MARITES R. PANGILINAN, P.E.E. WHAT IS LOW VOLTAGE INSULATION COORDINATION AND WHY IT IS IMPORTANT WHERE DO SURGES COME FROM HOW DO SPDs WORK/TYPE OF SPDs SPD SPECIFICATIONS SPD COORDINATION /CASCADING
More informationUS Catalog March Surge protective devices (SPDs) UL range
US Catalog March 017 Surge protective devices (SPDs) UL range Surge protective devices (SPDs) UL range Introduction 1 1 OVR surge protective devices Joslyn surge protective devices Marketing tools 4 US
More informationInstallation Instructions
Installation Instructions (Catalog Number 1771-OD) This document provides information on: Because of the variety of uses for the products described in this publication, those responsible for the application
More informationGENERAL UL th EDITION DESIGN-BUILD SPEC: SURGE PROTECTIVE DEVICES Prepared by THOR SYSTEMS, INC.
[Refer to Engineering Notes at End of Spec] Section [16XXX] [264XXX] - SURGE PROTECTIVE DEVICES (SPDs) PART 1 - GENERAL 1.1 SCOPE A. This section includes Surge Protective Devices (SPDs) for low-voltage
More informationWhite Paper Surge Current Characteristics: 570 Hybrid Surge Protective Device
White Paper Surge Current Characteristics: 57 Hybrid Surge Protective Device Surge Current Characteristics: 57 Hybrid Surge Protective Device This document describes the surge current mitigation characteristics
More informationSurge Protector. Esma Khatun
Surge Protector Esma Khatun 1.04.17 Overall Size Electronic Usage Use of electronic equipment has increased Overall size of the equipment has decreased TIME Smaller more compact electronic devices have
More informationInnovative Technology TVSS Products
Innovative Technology TVSS Products Technical Document WHY SILICON AVALANCHE DIODES ARE NOT RECOMMENDED FOR AC POWERLINE SUPPRESSORS TD37H12ASE Effective Date: 4/05 Page 1 WHY SILICON AVALANCHE DIODES
More informationUL Recognised Fusible Resistors
Resistive Components UL Recognised Fusible Resistors EMC and ULW Series C US Background Designers of power supplies and battery chargers for consumer products are faced with many conflicting requirements.
More informationSPM Series Plug-in Surge Protector Type 2/3 (Test Class II/III) Single & Three Phase Surge Arresters
The SPM series of modular surge protection devices provides protection of equipment connected to incoming low voltage AC power supplies against the damaging effects of transient over voltages caused by
More informationCONNECTED EQUIPTMENT EQUIPMENT AND
Technical Note No. 9 August 2006 Power Quality and Reliablity Centre TRANSIENT OVERVOLTAGES ON THE ELECTRICITY SUPPLY NETWORK EFFECTS ON CONNECTED EQUIPTMENT EQUIPMENT AND THEIR MITIGATION This Technical
More informationCPS block & CPS nano UL rd Ed. Surge protective devices (SPD)
V4 Cirprotec CPS block & CPS nano UL 1449 3rd Ed. Surge protective devices (SPD) Transient voltage surge suppressors (TVSS) Cirprotec, more than just protection Cirprotec, specialists in lightning and
More informationLPI SG + SS480 Spark Gap Surge Filters
LPI SG + Spark Gap Surge Filters Features High performance surge protector for an operating voltage of 220-277Vac Encapsulated spark gap and technology capable of operation under fault /overvoltage conditions
More informationAn Overview of Surge Protection for the Smart Grid IEEE PES/SPDC WG Matt Wakeham, Chair
An Overview of Surge Protection for the Smart Grid IEEE PES/SPDC WG3.6.13 Matt Wakeham, Chair The document content is of a general nature only and is not intended to address the specific circumstances
More informationMETAL OXIDE VARISTORS
POWERCET CORPORATION METAL OXIDE VARISTORS PROTECTIVE LEVELS, CURRENT AND ENERGY RATINGS OF PARALLEL VARISTORS PREPARED FOR EFI ELECTRONICS CORPORATION SALT LAKE CITY, UTAH METAL OXIDE VARISTORS PROTECTIVE
More informationGENERAL UL th EDITION BID SPEC: SURGE PROTECTIVE DEVICES Prepared by THOR SYSTEMS, INC.
[Refer to Engineering Notes at End of Spec] Section [16XXX] [264XXX] - SURGE PROTECTIVE DEVICES (SPDs) PART 1 - GENERAL 1.1 SCOPE A. This section includes Surge Protective Devices (SPDs) for low-voltage
More informationTechnical Data Sheet Medium Current Power Surge Filters
Technologies Technical Data Sheet Medium Current Power Surge Filters Features High performance surge protector for an operating voltage of 0-220Vac Designed to withstand fault and over-voltage conditions
More informationLPI SG + SST Spark Gap Surge Filter
LPI SG + SST Spark Gap Surge Filter Features High performance surge protector for an operating voltage of 220-240Vac Encapsulated spark gap and SST capable of sustaining fault and over-voltage conditions
More informationMONITORING ABSTRACT KEYWORDS. TRANSFORMERS MAGAZINE Special Edition: Bushings, 2017
MONITORING The difference between safe and reliable on-line bushing monitoring and false alarms often lays in the quality of the sensor design and the installation procedure ABSTRACT On-line monitoring
More informationIn the simplest terms, surge protective devices (SPDs) prevent damaging transient voltage surge levels from reaching the devices they protect.
How SPDs Work In the simplest terms, surge protective devices (SPDs) prevent damaging transient voltage surge levels from reaching the devices they protect. A useful analogy makes this clearer. Consider
More informationMotor Surge Suppressors and Cable Considerations
Motor Surge Suppressors and Cable Considerations Understanding the growing need for motor surge protection in SA Arveen Gobind Pragma Condition Monitoring (Martec) Agenda Introduction Network Motor Surge
More informationMedium Voltage Metal-Enclosed Harmonic Filter Systems
66 Carey Road Queensbury, NY 12804 Ph: (518) 792-4776 Fax: (518) 792-5767 www.nepsi.com sales@nepsi.com Medium Voltage Metal-Enclosed Harmonic Filter Systems General NEPSI s armorvar, medium voltage metal-enclosed
More informationCONNECT AND PROTECT. nvent ERICO Critec SRF N-Series. Surge Reduction Filters
CONNECT AND PROTECT nvent ERICO Critec SRF N-Series Surge Reduction Filters TABLE OF CONTENTS PROVEN FOR CRITICAL APPLICATIONS... 3 SRF N-SERIES COMBINED TECHNOLOGY PROTECTION... 4 SPARK GAP TECHNOLOGY...
More informationWhite Paper Transient Surges and Suppressor Technologies
White Paper Transient Surges and Suppressor Technologies 1457-001 White Paper Transient Surges and Suppressor Technologies Transient Surges and Suppressor Technologies Metal Oxide Varistor (MOV) versus
More informationPROTEC Z LV the universal solution for transient switching protection for LV motors, generators, transformer LV secundaries, VSD and UPS equipment
PROTEC Z LV the universal solution for transient switching protection for LV motors, generators, transformer LV secundaries, VSD and UPS equipment NTSA has developed the ultimate solution for protecting
More informationUnderstanding Solid-state relays
Understanding Solid-state relays Automation.com, August 2009 By TJ Landrum, Product Manager, Eaton Solid-state relays (SSR) are able to perform many of the same tasks as electromechanical relay (EMR)s.
More informationTel: Web: Lightning and surge protection help pages
Lightning and surge protection help pages Effects of lightning on your home or office Modern Technology has progressed to the point where detecting and preventing surges, has become an exact science -
More informationTDX Series. Transient Discriminating TM TVSS
TDX Series Transient Discriminating TM TVSS TDX Series TDX150 is ideal for service entrance protection. Best Value Engineered Protection With emphasis on efficiency and value, ERICO developed the TDX Series.
More informationAC Line Voltage Transients and Their Suppression
Harris Semiconductor No. AN9308.2 January 1998 Harris Suppression Products AC Line Voltage Transients and Their Suppression Author: Martin P. Corbett Introduction The increasing usage of sensitive solid
More informationMedium Voltage Metal-Enclosed Power Capacitor Banks
66 Carey Road Queensbury, NY 12804 Ph: (518) 792-4776 Fax: (518) 792-5767 www.nepsi.com sales@nepsi.com Medium Voltage Metal-Enclosed Power Capacitor Banks General Northeast Power System s (NEPSI's) medium
More informationAC Power Quality and Protection
Lab 5-2 Video System Troubleshooting Copyright 2006 Heathkit Company, Inc. All Rights Reserved AC Power Quality and Protection 2 Today we will look at... AC Line Surge Suppressors Phone Line Surge Suppressors
More informationELG4125: System Protection
ELG4125: System Protection System Protection Any power system is prone to 'faults', (also called short-circuits), which occur mostly as a result of insulation failure and sometimes due to external causes.
More informationSurgelogic Surge Protective Device I-Line Plug-On Unit Series
Surgelogic Surge Protective Device I-Line Plug-On Unit Series Catalog 1310CT0201R5/07 2007 Class 1310 CONTENTS Description Page Product Description.................................................. 2 Application
More informationGLOSSARY OF TERMS. Surge and Lightning Protection ERICO Inc.
GLOSSARY OF TERMS Surge and Lightning Protection ERICO Inc. Air Termination - shall mean that part of a lightning protection system designed to capture the lightning strike. Normally is mounted on the
More informationSurge Protection Done Right
I S S U E 02 V o l u m e 9 This Issue Surge Protection Done Right P.1 Surge Protection Done Right As you may be aware, Bryston has just introduced a line of Powerline Conditioners. Surge protection is
More informationALLTEC PROTECTION PYRAMID TM FOR PHOTOVOLTAIC SOLAR FIELD
64 Catalyst Drive Canton, North Carolina, 28716 USA +1.828.646.9290 +1.828.646.9527 (Fax) +1.800.203.2658 (Toll Free) www.alltecglobal.com ALLTEC PROTECTION PYRAMID TM FOR PHOTOVOLTAIC SOLAR FIELD Photovoltaic
More informationMaximize Your Uptime: Reducing Risk of Power Supply Failure
Maximize Your Uptime: Reducing Risk of Power Supply Failure White Paper presented by: Phoenix Contact P.O. Box 4100 Harrisburg, PA 17111-0100 Phone: 717-944-1300 Fax: 717-944-1625 Website: www.phoenixcontact.com
More informationSelecting the Right Components for Efficiency Gains and Protection in New and Retrofit Motor Systems
Selecting the Right Components for Efficiency Gains and Protection in New and Retrofit Motor Systems BACKGROUND As companies strive to cut production costs, reduce power consumption, and increase overall
More informationEngineering Notes. Transient Surges and Surge Suppressor Technologies: Comparing Apples to Oranges. Transient Surges Defined and Discussed 6
Engineering Notes TITLE PAGE Transient Surges and Surge Suppressor Technologies: Comparing Apples to Oranges Metal Oxide Varistor (MOV) versus Silicon Avalanche Suppressor Diode (SASD) Designs Discussion
More informationLPI SST Surge Filters
LPI SST Surge Filters Features High performance surge protector for an operating voltage of 200-240Vac Designed to withstand fault and over-voltage conditions of up to 85Vac, as per IEC664 Impulse discharge
More informationSPM Series. Plug-in Surge Protection
SPM Series Plug-in Surge Protection The SPM series of modular surge protection devices provides protection of equipment connected to incoming low voltage AC power supplies against the damaging effects
More informationSPM Series Plug-in Surge Protection
SPM Series Plug-in Surge Protection The SPM series of modular surge protection devices provides protection of equipment connected to incoming low voltage AC power supplies against the damaging effects
More informationPower Quality of Commercial Buildings - Advanced
Buildings - Advanced Hartford Steam Boiler One State Street P.O. Box 5024 Hartford, CT 06102-5024 Tel: (800) 472-1866 www.munichre.com/hsb May 2017 Background Power quality is a general term used to describe
More informationRedundant Bus Protection Using High-Impedance Differential Relays. Josh LaBlanc
Redundant Bus Protection Using High-Impedance Differential Relays Josh LaBlanc Purpose Discuss the configuration of the bus under study, and touch on the needs for redundant protection on the bus. Briefly
More informationCommon Mode Noise The Often Neglected Tenth Power Problem
A White Paper from the Experts in Business-Critical Continuity Common Mode Noise The Often Neglected Tenth Power Problem by Michael Boyle Executive Summary Computers and other electronic equipment play
More informationPresented by: Ron Hotchkiss Chairman, IEEE PES Surge Protective Devices Committee
Presented by: Ron Hotchkiss Chairman, IEEE PES Surge Protective Devices Committee Activities of the IEEE PES Surge Protective Devices Committee (SPDC) Standards Development Working Group Topics https://pes-spdc.org/
More informationVoltage surge suppressor
Sheet 1 PRODUCT DESCRIPTION AC/DC converter are used to rectify the line supply voltage for the DC link, normally are used uncontrolled or controlled rectifier without or with regenerative feedback unit.
More informationNTC thermistors for inrush current limiting
NTC thermistors for inrush current limiting Summary NTC thermistors for inrush current limiting, as all NTCs, are made of polycrystalline mixed oxide ceramics. They suppress high inrush current surges,
More informationINTRODUCTION TO SPECIFYING SURGE PROTECTION SURGE PROTECTION NOTE 1 INTRODUCTION TERMS PROBABILITY OF SURGES APPEARING:
INTRODUCTION TO SPECIFYING SURGE PROTECTION SURGE PROTECTION NOTE 1 BY PETER WALSH, PE INDUSTRIAL SOLUTIONS ENGINEER INTRODUCTION Surge Protective Devices (SPDs) can protect electrical equipment from harmful
More informationElectromagnetic Compatibility ( EMC )
Electromagnetic Compatibility ( EMC ) Introduction about Components 6-2 -1 Agenda Ferrite Core Isolation Transformers Opto-Isolators Transient and Surge Suppression Devices Varistors Gas-Tube Surge Suppressors
More information3 Design of the electrical installation protection system
J - Protection against voltage surges in LV 3 Design of the electrical To protect an electrical installation in a building, simple rules apply for the choice of b (s); b its protection system. 3.1 Design
More informationThe ABC s of Lightning TO BE SURE, USE DEHN
DEHN, INC. The ABC s of Lightning TO BE SURE, USE DEHN Lightning represents a stunning combination of nature s beauty and awesome power Lightning currents conducted in modern electrical circuits can cause
More informationSurge Protection Systems Performance and Evaluation
PDHonline Course E288 (2 PDH) Surge Protection Systems Performance and Evaluation Instructor: Bijan Ghayour, PE 2012 PDH Online PDH Center 5272 Meadow Estates Drive Fairfax, VA 22030-6658 Phone & Fax:
More informationEthernet Protection A Whole Solution Han Zou, ProTek Devices
Ethernet Protection ------ A Whole Solution Han Zou, ProTek Devices Introduction: As Ethernet applications progress from 10BaseT to 10Gigabit and beyond, IC components are becoming more complicated with
More informationApplication Note. Table 1. Test requirements by equipment type
UL1459 and FCC Part 68 Requirements Application Note Problem/Solution Subscriber equipment, also known as customer premise equipment (CPE), includes any equipment that is connected to the telecommunications
More informationLiebert AccuVar (ACV Series) Surge Protective Device (SPD) (With Noise Filtering) GUIDE SPECIFICATIONS for a Parallel Surge Suppression System
Liebert AccuVar (ACV Series) Surge Protective Device (SPD) (With Noise Filtering) GUIDE SPECIFICATIONS for a Parallel Surge Suppression System Part 1 General 1.01 Summary A. These specifications describe
More informationHandling Transient Threats in RS-485 Systems
oday s process control architectures and closed-loop systems are developed with numerous serial drops using point-to-point, multi-drop, or multipoint systems. he distances between serial drops can range
More informationPower Electronics. Semiconductor relay / - contactor
Power Electronics Semiconductor relay / - contactor PH 9260 POWERSWITCH 0247349 Semiconductor relay PH 9260.91 Semiconductor contactor PH 9260.91/000/01 AC semiconductor relay / -contactor According to
More informationHF81 X Capacitor Bleeder
HF81 X Capacitor Bleeder The Future of Analog IC Technology DESCRIPTION HF81 is an innovative two-terminal IC that automatically discharges an X capacitor while eliminating power losses and allowing power
More informationYOU NEED A WHOLE- HOUSE PROTECTION SYSTEM
YOU NEED A WHOLE- HOUSE PROTECTION SYSTEM Dr. Richard L. Cohen Panamax San Rafael, CA, 94903 (INTRO/ABSTRACT) Hard-wired AC and telephone protectors at the building entrance can keep major disturbances
More informationESD Protection Fundamentals
ESD Protection Fundamentals What is Electrostatic Discharge (ESD)? An ESD event is the transfer of energy between two bodies at different electrostatic potentials, either through contact or via an ionized
More informationData Line Transient Protection
Data Line Transient Protection By Joseph Seymour White Paper #85 Executive Summary Electrical transients (surges) on data lines can destroy computing equipment both in the business and home office environments.
More informationThis is a preview - click here to buy the full publication TECHNICAL REPORT
TECHNICAL REPORT IEC TR 62066 First edition 2002-06 Surge overvoltages and surge protection in low-voltage a.c. power systems General basic information Surtensions de choc et protection contre la foudre
More informationSurge Protection Devices for. Facility Engineers And Electricians. Today s Information. History of SPD Protection. Why Specify an SPD?
Surge Protection Devices for Facility Engineers And Electricians Peter Walsh, PE 1 Today s Information History of SPD Protection Why Specify an SPD? Codes and Standards Specifications Q & A 2 1 What Products
More informationLow Voltage and Medium Voltage Surge Protection
Low Voltage and Medium Voltage Surge Protection Chris M. Finen, P.E. Senior Application Engineer, Nashville TN 2018 Eaton Corporation. All rights reserved. Agenda Surge / Transient Basics Symptoms of Voltage
More informationDatasheet Stock No: RS Pro
Datasheet Stock No: 9012718 RS Pro Product Details: Our RS Pro metal oxide varistors have been designed to meet the abnormal overvoltage requirements outlined in Section 39.4 of the UL1449 standard (4
More informationAC Surge Protection Devices
AC Surge Protection Devices FLEXIBLE, INNOVATIVE SOLUTIONS FOR INFOCOM SYSTEM PROTECTION pioneers in surge protection Joslyn is recognized worldwide as the pioneer in the design, development and manufacture
More informationMDSP-Series 90kA, 150kA, 300kA Modular Distribution Surge Protector Type 2 Class II Surge Arrester
These modular distribution panel protectors for three phase power systems are designed to prevent damage to electrical distribution systems from mainsborne transient voltages which can occur as the result
More informationTECH NOTE #: CPS-1 SUMMARY OF APPLICABLE UL AND IEEE STANDARDS
TECH NOTE #: CPS-1 SUMMARY OF APPLICABLE UL AND IEEE STANDARDS FOR SURGE PROTECTION DEVICES This Tech Note provides an overview of the key standards associated with surge suppressors and AC powerline filters.
More informationCapacitor Switching Contactors
Capacitor Switching Contactors Types K3-..A.. and K3-..K.. Ideal for Power Factor and Harmonic Filter Systems Features that matter Patented design with significant damping of inrush current Long life tested
More informationINTRODUCTION LIGHTNING MAGNITUDE AND FREQUENCY
TRANSIENT LIGHTNING PROTECTION FOR ELECTRONIC MEASUREMENT DEVICES Patrick S. McCurdy Presented by: Dick McAdams Phoenix Contact Inc. P.O. Box 4100, Harrisburg, PA 17111-0100 INTRODUCTION Technology advances
More informationData Sheet. Surge protection devices - A technical overview
Data Pack K Issued March 1997 232-5985 Data Sheet Surge protection devices - A technical overview Introduction This data sheet covers the following topics: Types of electrical disturbance. Sources of surges
More informationSurge Protection. The effects of transient voltages on business and the benefits of installing Surge Protection Devices
Surge Protection The effects of transient voltages on business and the benefits of installing Surge Protection Devices Contents Executive Summary... 2 The Effects of Electrical Devices Failures... 3 Power
More informationAlways "On" UPS Systems Inc. USER MANUAL
Always "On" UPS Systems Inc. SMART HOME PROTECTOR USER MANUAL Bldg 1-150 Campion Road, Kelowna, BC, Canada, V1X 7S8 Phone: (250) 491-9777 Ext. 451, Fax: (250) 491-9775, Email: sales@alwaysonups.com Web
More informationLIGHTNING PROTECTION of SCADA AND TELEMETRY SYSTEMS
LIGHTNING PROTECTION of SCADA AND TELEMETRY SYSTEMS by Phillip R Tompson BE(Hons) CPEng MIE(Aust) MIEE MIEEE NOVARIS PTY LTD Abstract - This paper examines the characteristic current and waveform of a
More informationLightning and Surge Protection of Photovoltaic Installations. Leutron GmbH 2013 Leinfelden-Echterdingen, Germany
Lightning and Surge Protection of Photovoltaic Installations 1 Lightning and Surge Protection for PV Installations 2 Safeguard from Risks Ups, that was the insurance policy of my house!! 3 Why Lightning
More informationWelcome to the World of Transients. Transient Generation. The Nature of Transients. Externally Generated Transients. Lightning Generated Transients
Welcome to the World of Transients The Nature of Transients An electrical transient (surge, impulse, or spike) is a temporary excess in voltage and/or current on an electrical circuit that has been disturbed.
More informationHow to Select the Best Value Transient Voltage Surge Supressor for Your Equipment
How to Select the Best Value Transient Voltage Surge Supressor for Your Equipment Abstract A wide selection of Surge Protection Devices (SPDs) are now promoted by an even greater number of manufacturers
More informationPART 1: GENERAL PART 2: PRODUCT. Effective: 12/29/10 Page 1 of 6 FECA-TE-104D
Specification Number: 23 09 33 Product Name: FRENIC-Eco AC Drives for Variable Torque Fan & Pump Applications (1-125Hp at 208/230V and 1-900Hp at 460V) PART 1: GENERAL 1.01 SUMMARY A. This specification
More informationData Line Transient Protection
White Paper 85 Revision 1 by Joseph Seymour > Executive summary Electrical transients (surges) on data lines can destroy computing equipment both in the business and home office environments. Many users
More informationThe PCI Series. Precise power control for complex SCR applications. Phase Angle Fired SCR Power Controls AMPS VAC
The PCI Series Phase Angle Fired SCR Power Controls 25-1200 AMPS 120-600 VAC Precise power control for complex SCR applications. ROBICON 1996 Distributed Worldwide by www.mcgoff-bethune.com Applications
More informationAfter the storm leaves the area, you pat yourself on the back for protecting your data and equipment. The worry is over. Or is it?
Surge Suppression labmanager.com /laboratory-technology/2014/05/surge-suppression It is a summer afternoon and dark clouds are rolling in. You notice that outside your laboratory windows the lightning
More information2.1. SPD, Power Conditioning, PF Capacitors and Harmonic Filters. Contents Description. Introduction. Surge Protection and Power Conditioning
.1 Industrial and Commercial Surge Protection Introduction Industrial and Commercial Surge Protection SPD Series for Integration into Electrical Distribution Equipment SPD Series for Mounting External
More informationTDS Transient Discriminating Surge Diverters
TDS Transient Discriminating Surge Diverters Surge Protection And Surge Ratings The stress, which an SPD will experience under surge conditions, is a function of many complex and interrelated parameters.
More informationLatch-Up. Parasitic Bipolar Transistors
Latch-Up LATCH-UP CIRCUIT Latch-up is caused by an SCR (Silicon Controlled Rectifier) circuit. Fabrication of CMOS integrated circuits with bulk silicon processing creates a parasitic SCR structure. The
More informationElectrical Arcs: White Paper, Title Page WHITE PAPER. Electrical Arcs. By Brian S. Elliott. The #1 Value in Automation.
Electrical Arcs: White Paper, Title Page Electrical Arcs By Brian S. Elliott Electrical Arcs: White Paper, pg. 2 Those of us who have worked with, or around, electrical equipment have witnessed electrical
More informationFive Frequently Asked Questions about System Level Transient Voltage Protection
Five Frequently Asked Questions about System Level Transient Voltage Protection By Timothy Puls, Semtech Corporation 1. Do I really need a circuit protection device to protect my system from ESD? Years
More informationHF81 X Capacitor Bleeder
HF81 X Capacitor Bleeder The Future of Analog IC Technology DESCRIPTION HF81 is an innovative two-terminal IC that automatically discharges an X capacitor while eliminating power losses and allowing power
More informationC C CIRCUIT-BREAKERS Moulded-case (MCCB), general. 1. Introduction. 2. General description
CIRCUIT-BREAKERS C C81-21 CIRCUIT-BREAKERS - Contents 1. Introduction 2. General description 3. Rated voltages 3.1 Rated operational voltage (U e ) 3.2 Rated impulse withstand voltage (U imp ) 3.3 Rated
More information