IEEE C37.100.1-2018 IEEE Standard for Common Requirements for High-Voltage Power Switchgear Rated Above 1000 V.
The use of apparatus in an ambient temperature lower than —30°C or higher than 40 °C shall be considered as special. Tcmpcraturcs below —30 °C create a harsh cnvironmcnt for switchgcar. Many users in colder climates routinely cxpericncc —50 CC temperatures. The following should be considered for low ambient tcmperaturc environments:
Operating times may be slower than rated times
— Wax precipitation of insulating oil “cloud point” may occur where the oil becomes extremely viscous, creating excessive drag.
Humidity in air system freezes, sticking operating and blast valves.
— Liquefaction of sulfur hexatluoride (SF6) may occur, necessitating derating of interrupting ratings and dielectric ratings unless heaters are utilized.
Embrittlemcnt of plastics. composites, and metals may lead to failure during breaker or switching device operation.
— Hydraulic or pneumatic equipment, including fluid dampers, may be affected.
— Special lubricants may bc required to prevent sluggishness or freezing of bearings. Density and pressure switches may malfunction or may be out of range.
— Hcatcrs for the mechanism or gas may be required.
In certain regions vith frequent occurrence of warm humid winds, sudden changes of temperature andor atmospheric pressure may occur, resulting in condensation even indoors. In tropical indoor conditions, the aerage value of relative humidity measured during a period of24 h can be as high as 9S”/o.
3.3.5 Exposure to abnormal vibration, shock, or tilting
Standard switchgcar is designed for mounting on substantially level structures free Ilom vibration, shock, or tilting. Where any of these abnormal conditions exists, recommendations for the particular application should be obtained from the manufacturer.
4. Definitions For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary Online should be consulted for termns not defined in this clause. 16 An asterisk (*) indicates that at the time this standard was approved, there were no corresponding definitions in the IEEE Standards Dictionary Online. disconnector: A mechanical switching device that provides, in the open position, an isolating distance in accordance with specified requirements. (See IEC 60050-441:1984 [B3].) NOTE 1- A disconnector is capable of opening and closing a circuit when either negligible current is broken or made, or when no significant change in the voltage across the terminals of each of the poles of the disconector occurs. It is also capable of carrying currents under normal conditions and carrying for a specified time curents under abnormal conditions such as those of short circuit.IEEE C37.100.1 pdf download.