This standard covers the design, testing, and installation of metal-enclosed switchgear that incorporates gas (typically SF6) at higher than ambient pressure as an insulation medium for alternating-current applications rated above 1 kV to 52 kV. The contents of the switchgear may include but are not limited to circuit breakers, switches, bushings, buses, instrument transformers, cable terminations, instrumentation, metering and controls, and protective relays. In a vertical section of the… read more switchgear, some or all of the medium-voltage compartment(s) shall be composed of a gas pressure system for the primary insulating medium. This standard covers both indoor and outdoor installations. This standard covers switchgear using sealed pressure systems or closed pressure systems. Switchgear employing controlled pressure systems is not covered by this standard. This standard also does not cover switchgear that is covered under IEEE Std C37.20.2(TM), IEEE Std C37.20.3(TM), or IEEE Std C37.74(TM)-2014 that uses individual components that are gas-insulated such as switches, circuit breakers, and other equipment, nor does it fully cover those components that are covered by their individual component standards. read less

定价： 160元 / 折扣价： 136 元

This guide provides recommendations for the in-service visual inspection, application, care, maintenance, and electrical and mechanical testing of insulating flexible sling, including core, attachments, insulating sheath, for use during live line work on voltages up to 1000 kV alternating current (AC) and ±800 kV direct current (DC). Testing pertains only to preventive electrical and mechanical tests that may be performed periodically to check if there is any reduction in the electrical… read more performance, mechanical performance, and both electrical and mechanical performance of the insulating flexible sling. read less

定价：

This standard covers the design, testing, and installation of metal-enclosed switchgear that incorporates gas (typically SF6) at higher than ambient pressure as an insulation medium for alternating-current applications rated above 1 kV to 52 kV. The contents of the switchgear may include but are not limited to circuit breakers, switches, bushings, buses, instrument transformers, cable terminations, instrumentation, metering and controls, and protective relays. This standard applies if within a… read more vertical section of the switchgear, some or all of the medium-voltage compartment(s) is composed of a gas pressure system for the primary insulating medium. This standard covers both indoor and outdoor installations. This standard covers switchgear using sealed pressure systems or closed pressure systems. Switchgear employing controlled pressure systems is not covered by this standard. This standard also does not cover switchgear that is covered under IEEE Std C37.20.2™, IEEE Std C37.20.3™, or IEEE Std C37.74™-2014 that uses individual components that are gas-insulated such as switches, circuit breakers, and other equipment, nor does it fully cover those components that are covered by their individual component standards. read less

定价： 130元 / 折扣价： 111 元