IEEE C37.82-1987 (R2009) pdf free.IEEE Standard for the Qualification of Switchgear Assemblies for Class 1EApplications in Nuclear Power Generating Stations.
IEEE C37.82 conditions below are significant to the qualification of switchgear assemblies and included components.
The values given as usual service conditions represent the anticipated average conditions for switchgear assemblies innuclear power generating stations. These values are recommended for use in generic qualification programs and do notimply a derating of the equipment.
A yearly average ambient temperature of 30 C with temperature excursions to 10 °C and 40 °C is considered usual.
Relative humidity variations between 10% and 90% are considered usual.
Altitudes of up to 6600 ft (2000 m) above sea level for metal-enclosed low-voltage power circuit breaker switchgearand up to 3300 ft (1000 m) for metal-clad switchgear and metal-enclosed interrupter switchgear are considered usual.
Radiation exposure of up to 104 rads equivalent gamma total integrated dose over the qualified life is considered usual.4.1.5 Line Voltage
The line voltage shall be specified for the application. Voltage ratings as specified in ANSIIEEE C37.20.1-1987[12].ANSIIEEE C37.20.2-1987[13],ANSIIEEE C37.20.3-1987 [ 14], and ANSIIEEE C37.23-1987[15] are consideredusual. Switching surges of up to twice peak line-to-neutral voltage may occur occasionally, but Class 1E switchgearinstallations are usually not exposed to lightning surges.
The maximum control auxiliary circuit currents to be made, carried, and interrupted by auxiliary contacts of breakersand other components shall be as specified for the application.
The average loading shall be estimated for the application.The qualified life of switchgear components is dependenton the average loading. Considering duty and available power distribution options in nuclear Class 1E systems, theaverage loading rarely, if ever, approaches the continuous current rating of the equipment.
The maximum short-circuit current shall be specified for the application.4.1.11 Mechanical Operations
In order to provide a basis for qualified life demonstration, circuit breaker mechanical operations shall be specified.Acumulative number of mechanical operations not greater than that corresponding to two maintenance intervals, asdefined in applicable circuit breaker standards, is considered usual.
lt is considered usual that the mechanical loads from incoming cables，conduits,other interfacing hardware, orequipment such as transformers are separately supported or isolated so as not to impose significant mechanical loadingon the switchgear assembly structure.
When switchgear assemblies are applied where the service conditions are not within the range given as usual serviceconditions, the applicable service conditions shall be specified and the switchgear assemblies shall be qualified forthese conditions. Where qualification to unusual conditions becomes impractical,improvement of the serviceconditions may be necessary.IEEE C37.82 pdf download.