I'm trying to understand recloser control curve modifiers. Can anyone explain if the constant time adder and minimum response time are affected by the time multiplier, or are they independent of the multiplier? Also, does the multiplier affect the high current trip delay? The literature for the...
I was wondering if the connection shown in the drawing below,(two welded four hole connectors) would be considered a suitable bus support for the smaller IPS span? Larger Aluminum IPS span is 17” the smaller span is 12.5’. I’ve only considered insulators, S.A.’s, switches, bushings… as...
I’m working on a 69/13.2 distribution substation upgrade. On the Low side I’m connecting to two GIFU 15-01, 800:5 C.T.’s with a thermal rating of 1.5. (These C.T.’s are being supplied by the metering guys) The continuous current on the low side is 1093 Amps. These C.T.’s have flat tin plated...
I am working on a situation that we haven't had to deal with before. I'm installing a Cap bank across the road of one of our switching station. To get station service power to the cap bank, I want to run Quadruplex cable from the switching station 120 V station service AC box to the Cap Bank AC...
I'm designing a special case substation that needs communication with a control house across the street. I'm trying to avoid running 300+ yards of fiber underground or overground. I have communication between microwave towers at both sites. I was wondering, In general, what equipment or multiple...
I’ve been looking at a site that will need the use of Gabion Baskets to hold the existing slope. I’m an Electrical guy and was wondering if anyone had information on the calculations used to determine the amount of force from the earth? I'm guessing it's overturn, bearing capacity and sliding...
Is there a standard resistive current, charging current or application for adding arcing horns to switchgear? The voltage in question is 69kV through 345kV.
Thanks!
Hello,
This question pertains to lightning protection in substation design. When running overhead static wires for lightning protection, when is the Rolling Sphere Method preferred or required instead of the easier Cone Method to determine lightning protection coverage?
Thanks
