1939
1953
1970
1974
1994
2003
2014
ISOMETER® iso685
Bender Celebrates 75 Years of ISOMETER ® Ye A-ISOMETER® IRDH275 The F A-ISOMETER® IRDH265 e
Standards in changing times The first device standardffo
A-ISOMETER® IRG113Yb ISOMET ER
“Passive”insulation monitoring devices were considered state-of-the-art until well into the 20th centur
y.These devices, however
r,, were only used f used for checkfo The Father of active insulation monitoring
The breakthrough to active insulation monitor ing came in 1939 with the publication of a patentfor insulafo
tion monitoring and earth fault display devices ffo
b y Dipl-IngWalther Bender . Since then,W alther Bender has been seen as the “fa ther of insulation monitoring”.
as DIN 57413 part 2 (VDE 0413 part 2). A new part 8 was drafted in 1984 t o meet changing system requiremen ts. The ffo
or insulation monitoring devices w as published in January 1973 ollow -up standard DIN VDE 0413 part 8 c ombines parts 2 and
8 into a new part 8 and was published in Germany in M ay 1998 under the title“ insula tion monitoring devices ffosfor IT networks ”. The first international standar d was the IEC 61557-8 appeared in 1997. Te
fe
improvements. I n 2009, German standard DIN EN 61557-9 ( VDE0413-9) w as published under the title of“Equipmentffo
Te A-ISOMETER® 107TM40 Technology that keeps pace echnology th
The technology of insulation monitoring devices also developed quickly. Until the 1960’ the technology used was almost an exclusively superimposed measuring voltage. M any new applications hav e been added. The inverter technology brought attention t o possible direct current faults, i.e insulation faults behind rectifier elements. A devic e technology was then developed which was able to detect insulation faults behind rec tifiers. This w fofas ollowed by pulse superimposition technology
the 1960’s,’s ogy, whichw as superseded by “pulse y, A-ISOMETER® 2132P
code measurement technology ”. The EMC wiring frequently required necessita tes new measurement t echnologies or insulation monitoring devices with high syst em leak age capacitances. PV systems also need to cope with leakage capacitances into the u r ange. These requirements have consistently follo
ffo fo wed developments ffo
r,, intensive consideration of new applications in photovoltaic and electro -mobility has led the way in producing new patent applications from Bender. However B ender is also continuing to research other applications and new patents will ffolloo w .
nnovation and standar At Bender
Dipl pl.-Ing.Wo Wolfgang Hofheinz Chair of the DKE
Ur-ISOMETER® Certificate of first patent 1939
www.bender-uk.com Innovation and standardization or B ender insulation monitoring devices. Bender will continue to set the standards in the future.
Ten years later in 2007 this standard was reworked to incorporateafew or insulation fault location in IT systems”.Both these
standards are curr ently being reworked with a view to provisional publica tion in lat e 2014. or thr ee phase installations ing the insulation of unearthed
power supply systems which, until the seventies, were called protective conductor systems. For a long time it was common practice to use these devices in the mining sector.
Enter 13 BENDER UK Tel: 44(0) 1229 4801 Te el: 44(0) 1229 480123 Fax: 44(0) 1229 480345 Te
Low Mill Business Park, Ulverston, Cumbria, LA12 9EE Tel R
el R OI: +353 1 5060611
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