How to verify Temperature Rise of ASSEMBLY ?
Steps and Limits of Temperature rise of ASSEMBLY, Verification by Testing with Current, with Arrangement as in normal use.
Steps and Limits of Temperature rise of ASSEMBLY, Verification by Testing with Current, with Arrangement as in normal use.
While commissioning Assembly, Switchgear Nameplate gives important information, characteristics, Energy, Short Circuit, Accordingly Safety can be ensured.
I2t – Let through Energy is available thermal energy resulting from Current Flow during circuit opening. I2t (of circuit breaker) < K2S2 (of cable)
CTI is max voltage which material can withstands 50 water drops without without formation of conductive path.
Clearance is the shortest distance in air between two conductive parts. Minimum Clearance required to withstand transient overvoltages as per IEC 61439.
Tested Assemblies Varification Tests as per IEC 61439. Verification by TESTING, CALCULATION, DESIGN-RULES for Construction and Performance of ASSEMBLY.
Pollution factor can be solid, liquid, gaseous foreign matter which may reduce the dielectric strength accordingly Pollution Degree defined IEC 60664.
Circuit Breaker with Short Time withstand Icw capacity are Calassified as Category B (eg. ACB), and without Icw are Category A (eg. MCCB, MCB).
IEC 60947 the Standard for Low Voltage Switchgear and Controlgear – ACB, MCCB, SDF, MCB, Contactor, Relay, Transfer Switch, Arc Quenching Devices.
Types of Fuse Link IEC 60269, gG, gM, gR, gS, gD, gN. HRC Fuse, Semiconductor Fuse.
Thermal Memory of CB remembers previous fault, till conductor cools – comes to Ambient temperature, if CB is closed before this it will to trip CB faster.
Temperature rise is defined as the average temperature rise of the ASSEMBLY above the Ambient Air Temperature, with Rated Current load for 8 hours.
Reference Ambient Air Temperature is one third (1/3) of sum of Maximum Air Temperature “Current + Daily Average + Annual Average + 10°C”. As per IS 9676.
Utilization Categories indicate the type of Load and Duty Cycle of the load basis which selection of Switchgear should be done for the intended application.
Utilization Categories indicate the type of Load and Duty Cycle of the load basis which selection of Switchgear should be done for the intended application.