Use of motor operated disconnects (MOD) is largely a customer preference. I know of utilities that utilize MODs for all 345 kV and above equipment and others that prefer manual operation. Even if a MOD is operated locally (at the switch) time delays can be built into the operator to allow...
Traditional grouping for air disconnect switches is 15 kV (TR-205 110 kV BIL), 23 kV (TR-208 150 kV BIL) and 34.5 kV (TR-210 200 kV BIL). There are specials but these groupings are predominant in the US. For many years air disconnects had a nominal and maximum design kV rating. For 23 kV nominal...
Failure rate is 20 to 40 % depending on the raw material lot. Want to keep inside radius as tight as possible but could go to 2t or 2 1/2t if necessary. Parts arecompletely failing, i.e. broken in two. The holes fix one leg of the part. The other leg acts as a stop and does see some load (approx...
I have a 3/8" by 1 1/4" 1018 steel bar that has holes punched, sheared to length and is then bent in a forming die. The inside radius is 1/2". A hydraulic press is used and the bending operation is much quicker than a typical press break. We are loosing a number of pieces from each stick as the...
After getting to the right person at Megger I found out that I would have to establish a ground through the auxiliary ground terminals of the unit. A bit on an inconvenience but it will work.The ground connection is simply a precaution to assure that the circuit being tested is safe to test...
I recently purchased a Megger DLRO200 low resistance ohmmeter. Unfortunately the unit must be plugged into a 120 VAC source which is not convenient in our manufacturing facility. We purchased a pure sine wave inverter (300 W), battery charger and 12 V battery in hopes of converting to a self...
