Hi Pot Test Procedures for Cable Jointers

Hi, I’m Ken Rousseau a Cable jointer for MES Power. Today I’m gonna take you behind the scenes to do a live test with an 800 PL series portable DC hipot testers. Here at MES Power we always stress the importance of safety so be sure to check with your own company’s safety guidelines for personal protective equipment.

This unit is our 880 PL DC hipot tester. It’s capable of putting out 80 kV at ten mA. Other models in the 800 series follow similar testing procedure, but today I’m gonna talk about testing on a 15 kV rated URD cable. While the power is off, connect your AC power supply to the unit, and your 120V/60Hz power strip. Also, connect your high-voltage, return, and ground leads.

Then connect the other ends of your leads back to the unit. Also be sure your interlock plug is connected. Now it’s time to make sure that all nonessential personel are out of the testing area so you can begin your test. set your current range to max and set your voltage range to the desired setting. My cable is only rated to 15kV, so I’m going to use the lowest 0 to 20 kV setting.  Make sure your voltage control is lowered all the way to zero.  Turn on the AC power switch and this beacon will light up to indicate that there is power to the unit.

From a safe position, turn on your high voltage.

This beacon will light red indicating that you are ready to start your test. Slowly raise your voltage to your desired setting for me that’s gonna be about 13 kV You can hold you voltage for as long as your test specifies. Now that the voltage is on my device under test I’m gonna check the leakage current on the current meter. Right now the current meter range is set from 0 to 10ma.  Luckily it’s nowhere close to 1 milliamp  so I’m going to adjust the current range to go into microamps. Now we’ve got about four micro amps of leakage current so, I’m going to readjust the current range to the 0-10 milli amp range My test has run long enough. Next, I’m going to go ahead and slowly lower my voltage back down. I’m going to turn my high voltage off, and my AC power off.

It’s important to make sure that you unit is properly grounded, so I’m going to use a grounding stick.

Now you are ready to disconnect your specimen. and pack up the 880  for another test to recap set up your testing area connect the AC power to the unit connect your high-voltage return and ground leads be sure that the interlock plug is in place. Set the desired range on the Set the desired range on the current meter and the voltage meter. Check to make sure the current meter dial is at 10 mA and the raise voltage control is at 0 power on the unit using the AC power switch engage the high voltage by pressing the HV on button. Perform the test. raise the voltage control to the desired level for the desired time observe leakage current adjusting the current meter to a more accurate range as needed complete the test reset the current meter dial to ten mA lower the voltage back down to zero. Turn the high voltage off and the AC power off. For safety use a grounding stick to ground the specimen under test. for more information on the 880 PL or for our other hv maintenance services be sure to check out our web site where you can also view other demo videos as well as get datasheets for any of our units. Thanks for reading!

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