The goal of the standard is to provide a single set of rules and regulations that cover the seismic design of both new and existing electrical substations, hence leading to standardization.[3] The standard provides the minimum requirements that the design of an electrical substation (except nuclear power plants) must adhere to. The norm includes the design of circuit breakers, transformers, disconnect and grounding switches, instrument transformers, circuit switches, surge arresters, and other equipment.[4]
Specifying this recommended practice in user's specification
Standardization of criteria
Selection of qualification level
Witnessing of shake-table testing
Optional qualification methods
Qualifying equipment by group
Inherently acceptable equipment
Shake-table facilities
Equipment too large to be tested in its in-service configuration
Report templates
Installation considerations
General
Equipment assembly
Site response characteristics
Soil-structure interaction
Support structures
Base isolation
Suspended equipment
Anchorage
Conductor induced loading
Interconnections with adjacent equipment
Observed component displacements
Decoupling equipment through flexible bus-work
Conductor installation
Short-circuit loads
Wind and ice loads
Qualification methods: an overview
General
Analysis methods
Static analysis
Static coefficient analysis
Response spectrum dynamic analysis
Time history dynamic analysis
Testing methods
Special test cases
Qualification method for specific equipment
Functionality of equipment
Qualification by seismic experience data
Response spectra
Damping
Design considerations
Structural supports, excluding foundations
Foundation analysis
Station service
Emergency power systems
Telecommunication quipment
Seismic performance criteria for electrical substation equipment
Introduction
Objective
Seismic qualification levels
High seismic level
Moderate seismic level
Low seismic level
Projected performance
Performance levels
High
Moderate
Low
Seismic qualification
High and moderate seismic qualification levels
Low seismic qualification level
Selecting the seismic level for seismic qualification
The norm specifies 3 seismic qualification levels (high, medium, low).[6] The Zero Period Acceleration (ZPA) (a.k.a. Peak Ground Acceleration) for the high and the medium qualifications levels are set to be 0.5g and0.25 respectively (no calculation is required for equipment with "low" qualification), where g stands for acceleration due to gravity. The Peak Acceleration (i.e. the peak of the Response Spectrum) at 2% damping is lower than 1.65g and 0.85g for high and medium qualification respectively, with the cutoff frequency defined as 33Hz.[3]
The qualification is allowed through one of the following:[7]