Volt-time characteristics of short air gaps under nonstandard lightning voltage waves

Conference · Thu Feb 01 04:00:00 EST 1996

OSTI ID:195681

Chowdhuri, P; Mishra, A K ^[1]; McConnell, B W ^[2]

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1. Tennessee Technological Univ., Cookeville, TN (United States)
2. Oak Ridge National Lab., TN (United States)

The breakdown voltage level of a dielectric system under a transient voltage of a given waveshape is not a constant parameter. When transient voltages of the same waveshape but of increasing amplitude are applied to a dielectric system, the dielectric breaks down at higher voltage levels at shorter time delays for the higher applied voltages. This characteristic, known as the volt-time or time-lag characteristic, significantly influences the insulation coordination of an electric power system. The volt-time characteristics of 5-cm long rod-plane and rod-rod air gaps were experimentally determined with five different waveshapes of the applied impulse voltage. The front time of the waves was varied from 25 ns to 10 {micro}s, and the time to half value was varied from 0.5 {micro}s to 100 {micro}s. The volt-time characteristics were also checked analytically using the concept of disruptive effect. The parameters for the disruptive effect were experimentally determined.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Tennessee Technological Univ., Cookeville, TN (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 195681
• Report Number(s): CONF-960159--1; ON: DE96005742
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
AIR
BREAKDOWN
DIELECTRIC MATERIALS
ELECTRIC ARCS
ELECTRIC POTENTIAL
ELECTRICAL INSULATION
ELECTRICAL TRANSIENTS
LIGHTNING
PLATES
POWER SYSTEMS
RODS
SURGES
WAVE FORMS