location
- fournais a/s
- Enrumvej 7
- DK - 2942 Skodsborg
- Telefon: +45 45 89 04 45
Asynkrone kortslutningsmotore (elektromotorer) eller pumper drevet af en softstarter eller frekvensomformer, finder i stødt stigende grad indpas i moderne maskininstallationer.
Disse regulerede drev, genererer samtidig kritiske harmoniske forstyrrelser, som sendes retur, ud på AC-forsyningsnettet.
Konventionelle RCD‘ere som dem der kendes fra fx boligen, eller simpel jordfejlsovervågning (f.eks. kendt fra 3 lampe- eller dobbelt voltmetermetoden) kan ikke håndtere denne opgave.
Dette bl.a. fordi, et konventionel RCD kun er testet virksomt i området omkring grundtone – dvs. i frekvensområdet 50/60 Hz.
Endvidere har et almindeligt RCD en yderst begrænset bryde- og bæreevne, typisk i området fra 500 A til 10 gange mærkestrøm.
Udover dette parameter, skal beskyttelsesudstyret kunne håndtere de i anlægget forekommende lækstrømme.
Ydermere skal belastningen af elektromotorens isolationsmateriale også iagttages, under projektering og valg af rette beskyttelsesudstyr.
I avancerede maskinanlæg er der derfor behov for moderne overvågnings- og beskyttelsesudstyr fra Bender, som hurtigt registrere og alarmere/rapporterer om disse problemer.
Download | Produktoversigt – ISOMETER® |
Download | Produktoversigt – Reststrømovervågning |
Download | Teknisk papir – Lokalisering af isolationsfejl i IT-systemer – Planlægning og setup |
Download | Teknisk papir – Elektrisk sikkerhed i kontrol- og hjælpekredse |
DS/EN 61557-8
Elektrisk sikkerhed i lavspændingsdistributionssystemer op til 1 000 V a.c. og 1 500 V d.c. – Materiel til prøvning, måling eller overvågning af beskyttelsesforanstaltninger – Del 8: Udstyr til isolationsovervågning i IT-systemer
DS/EN 61557-9
Elektrisk sikkerhed i lavspændingsdistributionssystemer op til 1 000 V a.c. og 1 500 V d.c – Materiel til prøvning, måling eller overvågning af beskyttelsesforanstaltninger – Del 9: Materiel til lokalisering af isolationsfejl i IT-systemer
DS/EN 61557-15
Elektrisk sikkerhed i lavspændingsdistributionssystemer op til 1 000 V vekselspænding og 1 500 V jævnspænding – Udstyr til prøvning, måling eller overvågning af beskyttelsesforanstaltninger – Del 15: Funktionelle sikkerhedskrav til isolationsovervågningsudstyr i IT-systemer og udstyr til lokalisering af isolationsfejl i IT-systemer
DS/EN 50178
Elektronisk udstyr til brug i kraftinstallationer
DS/IEC 60204-1
Maskinsikkerhed – Elektrisk udstyr på maskiner – Del 1: Generelle krav
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