Corona (electric field) strength
Corona (electric field) strength
(OP)
Clause 4.3.3 in ABB Switchgear Manual recommends designing the HV conductors below 19 kV/cm, and marginally at 21 kV/cm (I believe this is too high!), I am currently working on 400 kV station with a requirement of 16.5 kV/cm, this needs a quad conductor configuration.
Does 16.5 kV/cm limit the corona hissing? any difference if designed at 19 kv/cm?
Thanks
Does 16.5 kV/cm limit the corona hissing? any difference if designed at 19 kv/cm?
Thanks






RE: Corona (electric field) strength
Figure D.1 Allowable surface voltage gradient for equal radio-influence generation under standard conditions versus bus diameter
the allowable surface voltage gradient Eo depends [for the standard conditions of atmospheric pressure and temperature] on conductor diameter –for about 1 inch bus diameter permissible is 19 kV/cm and for 15 inches diameter is only 9 kV/cm.
RE: Corona (electric field) strength
There will be some roughness to add up into the Eo equation, howeover, it might be misleading with the bus diameter if bundled conductors are used to lower the surface gradient (the bigger the bus, the lower the allowable surface gradient).
RE: Corona (electric field) strength
ch. 8.4.1 may be interesting for overhead transmission lines.