ABB PR512 Manual

Also see for PR512: Operator's manual

61DESCRIPTIONElectromagnetic compatibilityThe PR512 microprocessor-based protectionrelays ensure correct operation and are immuneto unwarranted trips, even in the presence ofinterference caused by electronic apparatus, bystormy weather conditions or electric discharges.Moreover they do not interfere with any electronicapparatus near the installation.These performances are obtained thanks to thefollowing construction characteristics:– the galvanised iron box provides efficientelectromagnetic screening– special filters on the current transformer inputsguarantee immunity against conducted interfer-ence– the precise construction technique of the printedcircuit helps to keep the level of electromagneticsensitivity very low.The above is in compliance with the EN 50081,50082 and IEC 255-22 Standards as well as withEuropean Directive EEC 89/336 regardingelectromagnetic compatibility )EMC), in respect ofwhich the releases are marked with the CE mark.Service conditions– Operating temperature:- 5 °C ... + 40 °C– Storage temperature:- 40 °C ... + 90 °C– elative humidity without condensation: 90%– MTBF: 15 years at an operating temperature of+45°C.Degrees of protectionThe degree of protection of the units mounted in aswitchboard is IP30.For higher degrees of protection, please consultABB.Technical documentationFor in-depth technical and application aspects,please ask for the following publications:– UniMix switchboards 1VCP000008– UniAir switchboards 1VCP000065– SafePlus switchboards 1VCP000086– SD-View systems 1VCP000176.Quality System and Environmental Man-agement system: these comply with the ISO9001 and ISO 14001 Standards respectively andare certified by an independent body.UniAir: air-insulated metal-enclosedswitchboards for secondary distributionRated voltage ... 24 kVRated current ... 1250 AShort-time withstand current ... 20 kA SafePlus: gas-insulated metal-enclosedswitchboards for ring main unitsRated voltage ... 24 kVRated current ... 630 AShort-time withstand current ... 20 kA