arrester dictionary

1、arrester dictionaryaacceptance tests arrester arrester agingarrester body, egla svu arrester classification arrester - deadfront typearrester - dead-break arrester discharge current arrester discharge voltage arrester disconnector arrester - dist, heavy duty arrester - dist, light duty arrester - di

2、st, normal duty arrester duty cycle rating arrester - egla arrester - gis-arrester arrester - high voltage arrester - line discharge class arrester - liquid-immersed type arrester - load-break arrester arrester - medium voltage arrester - mov type arrester - polymer-housed arrester - riser pole type

3、 arrester - separable typearrester - station class arrester unit arrester - 5ka arrester arrester - 10ka arrester average sparkover voltage bbilbsl backflashback flashover rate, bfor bending moment breaking load ccertification tests cfo classifying current composite hollow core insulator conditionin

4、g testsconformance tests continuous current of arrester continuous operating voltage - uc conventional bil conventional bsl coefficient of grounding (cog) conventional withstand voltage coordination of insulation cracking creepage distance crest value critical flashover voltage (cfo) ddamage limit d

5、eadfront type arrester deflector degradation design tests designation of an impulse shape disconnectordischarge counter discharge current discharge indicator discharge voltage discharge voltage-current characteristic discharge withstand current disruptive discharge distribution arrester duty-cycle v

6、oltage rating eearth fault factor electrical unit electrical agingelectrical unit of svu energy absorption capability externally gapped line arresters, egla ffail-open current rating for liquid-immersed arrester fail-short current rating for liquid-immersed arrester fast-front overvoltage, ffo fault

7、 indicator ferroresonance flashover flashover rate, for follow current (i-follow) follow current of an arrester front of an impulse front-of-wave impulse sparkover voltage ggapless grading current grading or control ring ground lead disconnectorground terminal hhigh current impulse highest system vo

8、ltage, us highest equipment voltage um housing hydrophobic hydrophilic iiec ieeeimpulse impulse protective level - iec impulse protective level - ieeeimpulse protective volt-time characteristic impulse sparkover voltage impulse sparkover volt-time characteristic impulse withstand voltage indoor arre

9、ster insulation coordination insulation level internal grading system of an arrester ionization current ionization voltage llead lengthlightning lightning current impulse lightning impulse protective level, lipl lightning impulse withstand voltage, liwv lightning overvoltage lightning surge line arr

10、ester line discharge class line terminal liquid-immersed type arrester long-duration current impulse mmargin of protectionmaximum continuous operating voltage rating (mcov) maximum design cantilever load-static (mdcl-static) maximum system voltage mean breaking load, mbl mechanical unit metal-oxide

11、surge arrester (mosa) metal-oxide surge arrester without gaps metal-oxide surge arrester with gapped structures metal-oxide surge arrester with external series gap (egla) metal-oxide varistor (mov) mosa mov arrester nneutral earthing or grounding nominal discharge currentnominal rate of rise nominal

12、 system voltage non-gapped line arresters, nglanon-linear metal-oxide resistor nonself-restoring insulation normal lightning current oovervoltage operating duty cycle oscillatory surge outdoor arrester ppartial discharge (pd) peak value peak (crest) value of opposite polarity of an impulse polymer-h

13、oused arrester porcelain-housed arrester power-frequency sparkover voltage power-frequency withstand voltage power-frequency withstand voltage versus time characteristic pressure-relief device of an arrester pressure relief rating production tests prorated section prospective (available) short-circu

14、it current (at a given point in a circuit) protective characteristics of an arrester protective zone puncture rradio-influence voltage (riv) rating rated frequency of an arrester rated voltage of an arrester ur reference current (iref) reference current of an svu (iref) reference voltage (vref) (ure

15、f) reference voltage of an svu (uref) residual voltage of an arrester, ures riser pole type arrester routine tests s salt deposit density (sdd) section of an arrester self-restoring insulation separation distanceseries gap severe lightning current shed shielding failure flashover rate, sffor shieldi

16、ng failure rate, sfr shunt gap single energy absorption capability slow-front overvoltage, sfo sparkover spd specified continuous load (scl) specified short-term load (ssl) standard lightning impulse standard lightning impulse sparkover voltage standard switching impulses statistical (bil) statistic

17、al (bsl) statistical withstand voltage steep current impulse strike distance surface current of svu surge surge arrester switching impulse protective level (sipl) switching overvoltage switching surge switching current impulseswitching impulse withstand voltage, siwv switching surge flashover rate,

18、ssfor system voltage system neutral grounding system grounding ttail of an impulse terminals terminal line forcetime-to-impulse sparkover tracking temporary overvoltage (tov)thermal energy absorption capability thermal runaway of an arrester thermal stability of an arrester time to sparkover torsion

19、al loading tov curvetransient overvoltage transmission line arrestertraveling wavetype tests (design tests) uultimate mechanical strength-static (ums-static) unit operation unit of an arrester vvalve arrester valve element vent verification test for egla & insulator coordination very-fast-front over

20、voltage, vffo vibration withstand test virtual duration of wave front virtual zero point virtual steepness of impulse virtual time to half-crest on the tail t2 virtual duration of a rectangular impulse wwave wave front waveshape waveshape designation wave tail withstand voltage acceptance tests iect

21、ests made on arresters or representative samples after agreement between manufacturer and purchaser arrester iec and ieeea protective device for limiting surge voltages on equipment by discharging or bypassing surge current around the protected device, without any power frequency current flowing to

22、ground, and is capable of repeating these functions as repeatedly. sometimes spelled arrestor. related terms: surge arrester, spd arrester agingthere are two types of aging that can occur in arresters. both are forms of long term degradation.disk aging: this is a slow change in the electrical charac

23、teristic of the zno varistor due to electrical stress over time. if this does occur, the losss of the disk and arrester may increase to a point where the arrester could fail due to excess heating and thermal runaway of the disks. shed aging: this is a slow change in the physical characteristics of t

24、he weather sheds that can lead to external flashover or puncture. if puncture occurs the arrester may fail internally due to ingress of moisture of contamination. arrester body, egla svu iecnon-linear metal oxide resistor part, contained in a housing, which must be connected with an external series

25、gap to construct a complete egla; the arrester body may include several units. arrester classification iec and ieeearrester classification or arrester class is determined by prescribed test requirements of a standard. for arresters classified per ieee standards, the classifications are station, inte

26、rmediate, distribution heavy duty, distribution normal duty, distribution light duty. arrester- deadfront type, dead-front arrester ieeean arrester assembled in a shielded housing providing system insulation and conductive ground shield, intended to be installed in an enclosure for the protection of

27、 underground and pad-mounted distribution equipment and circuits. arrester - dead-break iecarrester which can be connected and disconnected from the circuit only when the circuit is de-energized. arrester discharge current iec and ieeethe current that flows through an arrester resulting from an impi

28、nging surge. arrester discharge voltage iec and ieeethe voltage that appears across the terminals of an arrester during the passage of discharge current. arrester disconnector iec and ieeea device that provides a means for disconnecting an arrester in anticipation of, or after, a overloaded in order

29、 to prevent a permanent fault on the circuit and to give indication of an overloaded arrester.noteclearing of the fault current through the arrester during disconnection is generally done by the nearest source side overcurrent-protective device. arrester - distribution, heavy duty class: ieeean arre

30、ster normally used to protect overhead distribution systems exposed to severe lightning currents. related term: iec class 1 arrester arrester - distribution, light duty class ieeean arrester normally installed on and used to protect underground distribution systems where the major portion of the lig

31、htning stroke current is discharged by an arrester located at the overhead line/cable junction. arrester - distribution, normal duty class ieee an arrester normally used to protect overhead distribution systems exposed to normal lightning currents. arrester duty cycle rating ieeethe designated maxim

32、um permissible root-mean-square (rms) value of power-frequency voltage between its line and ground terminals at which it is designed to perform its duty cycle rating. arrester egla iecan externally gapped line arrester. the body of the arrester is referred to the svu arrester - gas-insulated metal e

33、nclosed surge arrester, gis-arrester iecgas-insulated metal-enclosed metal-oxide surge arrester without any integrated series or parallel spark gaps, filled with gas other than air and used in gas-insulated switchgears.note the gas pressure is normally higher than 1 bar = 105 pa.= 14.7psi arrester h

34、igh voltage iecan arrester applied to transmission lines and generally tested to iec standards. related terms: station arrester, intermediate arrester, line discharge class 2.3.4.5 arresters. arrester- line discharge class 2,3,4,5 iecarresters tested per iec 60099-4 and meet the test requirements of

35、 line discharge class 2,3,4,5 arresters arrester - liquid-immersed type iec and ieeean arrester designed for use immersed in an insulating liquid. also referred to as under-oil arrester. arrester - load-break arrester iecarrester which can be connected and disconnected when the circuit is energized.

36、 arrester medium voltage iecan arrester applied to distribution circuits and generally tested to iec standards. related terms; distribution arrester arrester - mov type iec and ieeean arrester fabricated using nonlinear metal-oxide varistors for the valve elements. arrester - polymer-housed iec and

37、ieeearrester using polymeric and composite materials for housing, with fittings.note designs with an enclosed gas volume are possible. sealing may be accomplished by use of the polymeric material itself or by a separate sealing system. arrester - riser pole type ieeean arrester for pole mounting nor

38、mally used to protect underground distribution cable and equipment. arrester - separable type, separable arrester iecarrester assembled in an insulated or screened housing providing system insulation, intendedto be installed in an enclosure for the protection of distribution equipment and systems.el

39、ectrical connection may be made by sliding contact or by bolted devices; however, allseparable arresters are dead-break arresters.note the use of separable arresters is common in europe.note 1 most dead-front arresters are load-break arresters.note 2 the use of dead-front arresters is common in the

40、usa. arrester - station class ieeean arrester tested per ieee c62.11 that meets all station class test requirements. this arrester is generally of higher energy capability and better discharge characteristics than distribution and intermediate class arresters. arrester unit iec and ieeeany section o

41、f a multi-unit arrester. arrester 5ka arrester iec and ieeean arrester that has a nominal discharge current of 5ka. often times this is also called a normal duty arrester. arrester 10ka arrester iec and ieeean arrester that has a nominal discharge current of 10ka . often times this is a heavy duty d

42、istribution or line discharge class 1 arrester. average sparkover voltage iec and ieeepower frequency sparkover voltage: the average of at least 5 successive power frequency sparkovers. lightning impulse sparkover voltage: the average of at least 5 successive lightning impulse sparkovers. basic swit

43、ching impulse insulation level (bsl) iec and ieeea) the electrical strength of insulation expressed in terms of the crest value of a standard switching impulse. bsl may be expressed as either statistical or conventional. b) a specific insulation level expressed as the crest value of a standard switc

44、hing impulse.see also: conventional basic switching impulse insulation level (bsl); statistical basic switching impulse insulation level (bsl). backflash an insulator flashover originating from the pole or tower ground across the insulator onto the phase conductor. this can occur during a lightning

45、strike to the overhead shield wire and where the ground impedance is high. it is referred to as a back flashover since it is in the opposite direction of flashovers produced in laboratory tests. the backflash is usually followed by a standard flashover of the insulator with power frequency current t

46、hat requires a breaker operation to terminate. back flash overrate (bfor) iec and ieeecharacteristics of an overhead line or system with respect to the number of back flashovers typically given per 100 km and year. bending moment iec and ieeehorizontal force acting on the arrester housing multiplied

47、 by the vertical distance between the mounting base (lower level of the flange) of the arrester housing and the point of application of the force. related term cantilever strength breaking load iecforce perpendicular to the longitudinal axis of a porcelain-housed arrester leading to mechanical failu

48、re of the arrester housing certification tests ieeetests ran on a regular, periodic basis to verify that selected, key performance characteristics of a product or representative samples thereof have remained within performance specifications. cfo see critical flashover voltage iec and ieee classifyi

49、ng current ieeethe designated current used to perform the classification tests. the equivalent iec term is nominal current, in composite hollow core insulator iec and ieeea hollow core insulator with and frp tube covered with polymer sheds either molded on or slipped on. conditioning testsconditioni

50、ng tests are test that take place in a standard test that is meant to represent stresses similar to long term service. they generally precede durability and withstand tests conformance tests ieeetests made, when required, to demonstrate selected performance characteristics of a product or representative samples thereof. continuous current of an arrester ieee and ieccurrent flowing