IEEE Std 693-2018 pdf download
IEEE Std 693-2018 pdf download.IEEE Recommended Practice for Seismic Design of Substations.
2) The configuration, height of the support, and any other specific detailing requirement, if furnished with a dedicated or intermediate support.
3) The details of the support structure including anchorage points, if the manufacturer is responsible for qualif’ing the equipment on any other support, including primary substation structures.
e) The user should include a schedule of due dates for completion of the test plan, testing (if needed), and the report.
The templates given in Annex U may be used in preparing seismic qualification specifications for Annex B through Annex P, Annex V, and Annex W.
The specification templates are given in English. They may be translated into other languages.
The test plan schedule requirements should he omitted from the Annex B template if the qualification is by analysis.
4.4 Selection of qualification level for a region
This recommended practice provides three levels of qualification that should encompass the needs of most users. Experience has shown that it is good practice to specify the same criteria for all like equipment in all substations within a reasonably large geographical area. In the event of equipment malfunction following an earthquake, equipment from other substations or standard spares can be moved and installed in the substation that experienced the loss. Equipment inventory management may be simplified by employing the fewest number of different qualification levels.
When selecting or standardizing a seismic qualification level for a region, the qualification level should be based on the highest seismicity within the region being considered. Refer to 5.7 and 5.12.
4.5 Acceptance of previously qualified electrical equipment
4.5.1 Acceptance of previous qualifications from other standards
Equipment that is in conformance with other standards may be acceptable and need not be requalified. However, a supplemental report shall be prepared by a seismic specialist. The supplemental report must provide detailed explanation and documentation that shows that the previous qualification adequately meets or exceeds the requirements of this recommended practice. Adequate1y” means that the previous qualification can be used to meet or exceed the requirements of the current recommended practice. in the opinion of the user and the seismic specialist.
4.5.2 Acceptance of previous versions of IEEE Std 693
Equipment qualified to IEEE Std 693-1997 or later versions will be deemed to be in conformance with the current version of IEEE Std 693, and the qualification need not be repeated, unless a previous qualification test or analysis method is specifically excluded by the current version.
The equipment that is excluded by the current version are the following:
— Bushings that are required to be qualified by time history testing (by D.5.5)
— Equipment utilizing composite insulators that have not passed the shed seal test (by A.4.6)
— Equipment 110 kV and above with conductor load effects, and qualified by means other than the static pull test (by A. 1.6)
— Surge arresters 90 kV DCV and above with conductor load effects (by A. 1.6.)
— Inherently acceptable equipment—anchorage calculations (by A. 1.5)
For equipment that is excluded by the current version as listed above, a supplemental report shall be prepared by the seismic specialist to be able to qualify the equipment to the current version of the recommended practice. The qualification will be acceptable provided the issues that cause the exclusion can be shown to be satisfied in the previous qualification or additional analysis or tests that arc performed. The supplemental report shall clearly identify the report applicable to the previously qualified equipment. The manufacturer shall furnish to the user, the supplemental report, and the seismic report for the previously qualified equipment.
4.5.3 Seismic identification plate
When previously qualified equipment has satisfied the requirements of 4.5, the manufacturer shall furnish a seismic identification plate in accordance with A.7.2. The manufacturer of such equipment shall provide to the user a supplemental reportllctter that includes depiction of the seismic identification plate.
4.6 Optional qualification methods
4.6.1 General
The manufacturer may replace an annex-specified qualification method with an optional qualification method listed in 4.6.2 through 4.6.10. The intent of the optional qualification methods is to return either a more conservative or a more precise determination of the seismic loads than the annex specified technique. Qualification techniques with recognized options are limited to those listed in 4.6.2 through 4.6.10.
