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[Sphenix-magnet-l] hipot-ed successfully again after the braids (with silicon-bronze nuts) are reconnected (between the Magnet and water-cooled-buses)

From: "Yip, Kin" <kinyip AT bnl.gov>
To: "sphenix-magnet-l AT lists.bnl.gov" <sphenix-magnet-l AT lists.bnl.gov>
Subject: [Sphenix-magnet-l] hipot-ed successfully again after the braids (with silicon-bronze nuts) are reconnected (between the Magnet and water-cooled-buses)
Date: Mon, 17 Apr 2023 21:34:54 +0000

Hello,

After the FES (Facility & Expt. Support) mechanical group put back the braids with Carl’s silicon-bronze nuts and Belleville washers,

we did the hipot for the entire system (up to Dump Resistor) again. { We couldn’t use Carl’s silicon-bronze bolts because they’re not

long enough and so we just used the old stainless steel bolts, with the silicon-bronze nuts. }

We hipoted the entire Magnet and water-cooled-buses up to Dump Resistor again. It’s again successful. When there was no problem, hipot-ing was very fast.

I attached the nos. that Carl wrote down.

With the Magnet only, we really see no (0) leakage current (Carl’s “hipot meter” only can measure down to 10 micro-amp).

Including the water-cooled-buses, the leakage currents indicate about 5 Mega-Ohm (from the magnet bus to ground), which is good enough.

Kin

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[Sphenix-magnet-l] hipot-ed successfully again after the braids (with silicon-bronze nuts) are reconnected (between the Magnet and water-cooled-buses), Yip, Kin, 04/17/2023