Reliable long term operating stability since the zinc oxide surge arresters have no gaps, the zinc oxide resistors are exposed to a long. Our designs include suspension, station and line post, as well as polymer insulator and arrester combinations for lightning. Table i shows nor mally recommended station dynavar arrester applica tion for various system voltages and grounding practice. Tov is sometimes specified in a table with specific voltages that can be withstood for 1 or 10 seconds. Maximum continuous operating voltage mcov of the arrester. Ieee guide for the application of metaloxide surge arresters. Application guide dynavar metaloxide surge arrester. Why do we make the rating of surge arrester kv always. This standard applies to devices for separate mounting and to devices supplied integrally with other equipment. We provide sustainable solutions that help our customers effectively manage electrical, hydraulic and mechanical power more safely, more efficiently and more reliably. Mcov is less stringent as regards uneven voltage distribution in an arrester. Contact your eaton sales engineer in your location for applications not listed. Mar 05, 2018 the proper arrester selection can prevent equipment damage.
It consists of a spark gap in series with a nonlinear resistor. Mediumvoltage surge arresters digital asset management. Mcov maximum continuous operating voltage that may be applied continuously between the terminal of the arrester. Type moa rated voltage kvrms mcov kvrms current impulse residual voltage 2ms rectangular current impulse withstand kvcrest 410. They have set the standard for design and manufacturing of polymeric distributionclass arresters up to 36 kv. Ieee station class iec station medium polymer housed surge arrester evp solid core station arresters comply with the latest revision of ieee c62. Protection of switchgear, transformers and other equipment in high voltage systems against atmospheric and switching overvoltages. Definition of surge arresters surge arresters are used to protect highvoltage equipment in substations, such as transformers, circuit breakers, and bushings, against the effects of overvoltages caused by incoming surges.
Use of an mcovequal to orgreaterthan maximum linetoline voltage divided by 1. The first step to selecting an arrester is determining the required arrester maximum continuous operating voltage, mcov, or continuous operating voltage, uc. Depending on the value and expected duration of system overvoltages, it may be necessary to use a 10 kv arrester with an mcov of 8. This is above the mcov of 7,650 v for an arrester rated 9 kv. For use when requirements of lightning intensity, energy capability and pollution are moderate. The mcov rating of a metaloxide arrester is the maximum designated rms. Application the polimhm surge arrester has been verified to meet station class requirements of ieee c62.
For this application, the mcov of the installed arrester must be equal or higher to the continuous voltage between the. For effectively grounded neutral systems, tranquell arresters with mcov equal to the maximum. Angloamerican circles the term mcov maximum continuous operating voltage is. Eaton s cooper power series distribution arresters provide superior overvoltage protection for any electric distribution system. Selection of the maximum continuous operating voltage.
A lightning arrester is essentially a collection of billions of microscopic junctions of metal oxide grains that turn on and off in microseconds to form a current path from the top terminal to the ground terminal of the arrester. The rating of an arrester is the maximum power frequency linetoground voltage at which the arrester is designed to pass an operating dutycycle test. Table 1 provides a general application guide for the selection of the proper arrester rating for a given system voltage and system grounding configuration as outlined in the ieee. Oem product guide index product type product catalog section page number arrester products lowvoltage secondary lightduty varistar storm trapper high energy arrester, underoildistributionclass surge arresters varistar storm trapper high energy arrester, external mount 23516 5 23516 5 arrester flipper fuse combinations. The ge tranquell line of surge arrester products provide excellent protective. The proper selection and application of lightning arresters in a system involve. Arresterfacts 010 the lightning surge and arresters. Abb has more than 100 years of experience in designing and manufacturing surge arresters and protection devices. Application of metaloxide surge arresters for alternatingcurrent systems ieee power engineering society sponsored by the surgeprotective devices committee cj u a 3 published b y the institute of electrical and electronics engineers, inc. This is the voltage at which the leakage current flowing through the arrester is limited up to its specified rated value.
Mov surge arresters preferred arrester mcov for this system voltage. Each piece of electrical equipment in an electrical system needs to be protected from voltage surges. Mcov maximum continuous operating voltage that may be applied continuously between the terminals of the arrester. There are several factors, such as grounding conditions and temporary over voltages, that can affect the arrester mcov selected. In order to prevent moisture ingression, the air space between the housing and. The arrester rating must be provided by northeast power systems, inc.
Arrester application example in grounded neutral circuits, a 233kv system usually. Voltage ratings of surge arresters powell industries. Metaloxide surge arresters in highvoltage power systems. Surge and lightning arresters eaton s mission is to improve the quality of life and the environment through the use of power management technologies and services. The equivalent frontofwave is the maximum discharge voltage for a 10ka impulse current wave which produces a voltage wave cresting in 0. Hubbell serves the needs of customers in a variety of market applications. This is the same data that is supplied with the tov curve, but instead of. A lightning arrester alternative spelling lightning arrestor also called lightning diverter is a device used on electric power systems and telecommunication systems to protect the insulation and conductors of the system from the damaging effects of lightning.
Superior design where low weight, reduced clearances, flexible mounting, and shatterproof housing is required. Zforce znp arresters archives maclean power systems. Mediumvoltage surge arresters siemens industry online support. Mediumvoltage surge arresters surge arresters are used for protection of electrical equipment from all kind of overvoltages caused by lightening or switching operations. The exlimp surge arrester has been verified to meet station class requirements of ieee c62. This table documents how well the arrester clamps lightning and switching surges, which is the fundamental purpose of arresters. To prevent damage to electrical equipment, surge protection considerations are paramount to a welldesigned electrical. For normal ungrounded type vs or vx station arrester application, arrester mcov is maximum system linetoline voltage divided by 1. The original lightning arrester was nothing more than a spark. Siliconehoused surge arrester pexlim pz english pdf leaflet surge arrester for gis elk04c english pdf leaflet three phase surge arrester az04d for 145 kv gis, elk04 c english pdf leaflet texlim product note english pdf leaflet surge arrester zno block testing english pdf leaflet high voltage surge arresters. Zincoxide arrester design and characteristics brief history of arrester technology the first commercially available lightning arrester was developed in the late 1890s by the stanley electric manufacturing company in massachusetts. Contents definition of surge arresters 02 siemens surge arresters for any requirement 04 always the best solution 05 history timeline 06 movs.
The rating of the arrester, the class of arrester and the location of the arrester all play a part in the surge protection. The zip arresters consistently withstand the following minumum design tests. Following each of the preceding tests, mov arresters demonstrate thermal recovery at mcov. If you operate the arrester at a voltage level greater than its mcov, the metal oxide elements will operate at a higherthanrecommended temperature.
Surge arresters parameters critical parameters minimum needed 1. The earthing screen and ground wires can well protect the electric system against direct lightning strokes but the fail to provide protection against traveling waves which may be reach the terminal. Distribution arresters overvoltage protection eaton. The equivalent frontofwave is the maximum discharge voltage for a 5ka impulse current wave which produces a voltage wave cresting in 0. Metaloxide surge arresters mosas designed to repeatedly limit the voltage surges on 48 hz to 62 hz power circuits. Type xpiiii surge arresters maximum system voltage 2 to 48 kv. The xps arrester is designed to meet the following performance data. These values meet or exceed those values contained in the referenced standard. A lightning arrester is a device, used on power systems, that contains billions of electronic switches that divert lightning currents around sensitive equipment and saves them from damage. The lightning arresters or surge diverters provide protection against such surges. Normally recommended mcov for various system voltages protective characteristics hubbell elbowparkingstand lightning arrester selection selection of the arrester size is based upon the maximum continuous operating voltage mcov linetoground that is applied across the arrester in service. Shielded surge arresters metal oxide varistor mov surge arresters fully shielded, fully submersible for convenient energized connection with 200 a loadbreak or deadbreak components up to 35 kv. Table 2 lists the mcov ratings of various mov arresters.
A higher rated arrester increases the ability of the arrester to survive on the power system, but reduces the protective margin it provides for a specific insulation level. How to select the right arrester hubbell power systems. A lightning arrester or a surge diverted is a protective device, which conducts the high voltage surges on the power system to the ground. Polymer arrester outline drawings contd porcelain arrester outline drawings mm for specifications on class 3, 4 and 5 ratings, please refer to the tables on pages 7 to 15. Both arrester survival and equipment protection must be considered in arrester selection. The arrester rating must be selected such that the maximum continuous power system voltage applied to the arrester is less than, or equal to, the arrester s continuous voltage capability. Polymer arrester outline drawings mm for specifications on class 3, 4 and 5 ratings, please refer to the tables on pages 7 to 15. Hubbell power systems is a proud member of the hubbell family. Type polimhm surge arresters maximum system voltage 2.
Why do we make the rating of surge arrester kv always less. The arrester designs are tested in accordance with the latest industry standards for metal oxide arresters. Pdf ieee guide for the application of metaloxide surge. Understanding the arrester datasheet nema arresters. All lightning arresters should withstand the maximum continuous operating voltage mcov.
Dec 11, 2014 lightning arresters a lightning arrester is a protective device which conducts the high voltage surges on the power system to the ground. Discharge voltage table in every arrester datasheet, you will find a most important table about the discharge voltage of the arrester in question. The typical lightning arrester has a highvoltage terminal and a ground terminal. The arrester rating must be selected such that the maximum continuous power system voltage applied to the arrester is less than, or equal to, the arresters continuous voltage capability. This arrester was rated 1,200 v and consisted of a simple rodgap design. Depending on the magnitude and duration of system overvoltages, it may be necessary to use a 10 kv arrester with an mcov of 8. Hps manufactures ohio brass polymer and porcelain insulators and arresters used in the transmission, substation and distribution markets. Arrester construction polymer surge arresters ge tranquell polymer surge arresters are constructed utilizing a rugged fieldproven silicone alloy housing placed over a unique highstrength fiberglass woven assembly of stacked metal oxide elements. Lightning arrester should be located close to the equipment that it is expected to protect. Ieee guide for the application of metaloxide surge arresters for alternatingcurrent systems surge protective devices committee of the ieee power engineering society ieee standards board. From controlled environments of a data center to the demanding continuity of the power grid.
As shown in figure 3, if the mcov of your selected arrester is 98kv, then the tov withstand capability for 10 seconds of the arrester 98kv arrester is 98 x 1. Elastimold arresters use highstrength silver epoxy bonded mov blocks and shunted spring connections for the best circuit. Elastimold psa and bsa arresters are equipped with a fully rated 200a switching and fault close loadbreak bushing. The arrester is available in a onepole, twopole, or threepole version. Production of high voltage surge arresters type pexlim english wmv movie seismic test high voltage surge arresters type pexlim english wmv movie excountii animation english exe movie data sheet abb ability wireless monitor for surge arrester english pdf data sheet. Surge arresters are used to protect transmission lines, transformer or other equipments from transient voltage. Zforce zhp arresters archives maclean power systems. For arresters on effectively grounded systems, this is. Type exlimp surge arresters maximum system voltage 2. The application and selection of lightning arresters. A comprehensive guide to surge arrester selection, application. For this application, the mcov of the installed arrester must be equal or higher to the continuous voltage between the phase and earth. The mcov rating of an mov arrester is important because its the recommended magnitude limit of continuously applied voltage. Elastimold shielded surge arresters cover all underground mediumvoltage.
Nov 09, 2018 this is above the mcov of 7,650 v for an arrester rated 9 kv. The mcov of each tranquell arrester is contained in table 2. The arrester is of single pole design, suitable for outdoor use, and designed in accordance with the latest revision of the ansiieee c62. Ohio brass has been producing high voltage surge arresters since the 1950s and offers a wide variety. Shielded surge arresters metal oxide varistor mov surge. In large substations, arrestors should be installed at takeoff points of the lines and of the terminal apparatus. Normally recommended station dynavar mcov for various system voltages general arrester information switching surge capability of dynavar arresters is expressed in terms of dissipated energy.
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