RECOMMENDED ELECTRICAL CLEARANCES AND INSULATION LEVELS IN AIR-INSULATED ELECTRICAL POWER SUBSTATIONS
Institute of Electrical & Electronics Engineers
1 Overview
1.1 Scope
1.2 Purpose
2 Normative references
3 Definitions
4 Criteria
4.1 Safety codes and regulations
4.2 Basic lightning impulse insulation level criteria
4.3 Radio interference voltage and corona criteria
4.4 Operating history
4.5 Economic aspects
4.6 Community acceptance
5 Substation insulation coordination
5.1 Protective margins and arrester maximum continuous
operating voltage
5.2 Selection of basic lightning impulse insulation level
and basic switch impulse insulation level
5.3 Selection of electrical clearances
6 Electrical operating/design clearances
6.1 General discussions
6.2 Historical background
6.3 Clearances based on lightning impulse conditions
6.4 Clearances based on switching surge conditions
7 Electric maintenance/safety clearances
8 Substation voltage uprating and compact design
8.1 BIL/System voltage ratio concept
8.2 Other considerations
Annex A (informative) Bibliography
Annex B (informative) Example calculations
Describes three-phase ac systems from 1 kV to 800 kV, provides recommended electrical operating and safety clearances and insulation levels in air-insulated electric supply substations; addresses insulation coordination procedures; provides design procedures for the selection and coordination of the insulation levels within the station as they relate to substation clearances; and addresses how reduced clearances in high-voltage ac substations will allow for compact bus arrangements and substation voltage uprating applications.
| Document Type | Standard |
| Status | Current |
| Publisher | Institute of Electrical & Electronics Engineers |
| Supersedes |
|
