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...
Yeah it's 17'. A bolted tee connector or a welded connector would work. Just was wondering if anyone had worked the numbers, or could send me in the direction of some standard that would explain this connection in the terms of IPS sizing.
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...
We are going to the window type C.T.'s for 1200 Amps in the future to put my mind at rest.
The sandwich solution seems to solve the problem at hand(If there actually was a problem?), but if anyone could think of some guide lines for connector construction and ampacity, it would be greatly...
The spacing is such that two more holes cannot be drilled into the two hole pad on the C.T... The holes on the C.T. are aligned vertically so they will mate up to the four hole pad and allow current to flow directly to the double 500 MCM without crossing directly across the two open holes on the...
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...
DPC: your right, I got to talking with a few guys that where in a meeting with me and it seems like the full load will be much closer to 15 amps(i never really had to deal with small AC load devices), which will make this problem almost go away. I figure I'll design for around a 30 amp load and...
Oldfieldguy: It's a 69kV Station. I was in communication with the CO-OP to install a station service pole on a distribution line that runs close, but my boss wants to explore this option, to keep from paying the CO-OP and from hanging a 69kV station service transformer.
Waross: I can't get a...
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
