I have two devices that left me completely stumped. They are Associated Research made devices. One seems to be a high voltage hypot tester. Another has 1/0 welding cable attached to it. At least one is called HyJoule.
Anyway, I am lost as to just what could be tested with a 1/0 welding cable (about 100 ft or so).
They are both the size of a under the desk refrigerator and VERY heavy, maybe 200-300 lbs each.
That was wrong. after some research and thinking, here's what I think.
The high voltage device is both a hipot tester (delivering a little bit of high voltage to test withstand voltages on insulation), as well as a "thumper". A "thumper" is a machine with big high voltage capacitors that delivers a pulse of high voltage energy to whatever. A similar (but bigger) machine can be seen here:
The low voltage device with 1/0 welding cable is a ground bond tester that tests ground bond by exposing it to a huge current.
The thumper can possibly be used to compress beer cans and make mini lightnings.
I will post an update if I find the above to be wrong.
You can find the location of a short in one of those realy big power cables by laying it out and covering it with sand then thumping it with a lot of current, the current cuases the cable to jump and throw the sand up, where the sand stops being thrown up is the location of the fualt.
HyJoule is high energy - thus needing the welding cable. Likely dumps large caps down the cables to test switches and relays... Special test requirements.
HyPot is high voltage and tests insulation of wire. Might be 20KV or more - likely 200K.
Martin H. Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net TSRA, Life; NRA LOH & Endowment Member, Golden Eagle, Patriot"s Medal. NRA Second Amendment Task Force Charter Founder IHMSA and NRA Metallic Silhouette maker & member.
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I've used gear like this on high voltage cable fault location. From your limited description, I can't tell you exactly what you have there, but I can tell you the sort of gear used on high voltage cable faults.
Testing a new or repaired cable needs high voltage DC , not much current required, typically milliamps once the cable is charged.
When you are trying to locate a fault, you need some way to get a primary location. This can be an impulse current reflection measuring device which shows you a picture of the wave as a hv capacitor is dicharged into the fault. Typically, you do this down a good core, then to the faulty core and compare to see where the waves deviate.
An older method involved a high voltage bridge, and sometimes this required a very heavy cable to connect the far end of a good core to the far end of the faulty core. We have a cable that is like what you describe for a particlarly strange setup in one of our substations.
Once you have a primary location, you go to that point on the cable and listen for the fault with senstive listening equipment while the the capacitor is discharged repeatedly into the fault.
When the cable is buried under a city street, it can be quite difficult to hear the fault. It can also happen that the original fault was cleared so quickly that the outer sheath of the cable is still intact. This means that the noise is inside a lead pipe, and even if you can hear it, you can't pinpoint the exact position of the fault. The answer is to discharge a very large capacitor - high joule - into the cable, the resulting high energy burns the cable down and makes the fault easier to find. I think the second box you have is a burn down unit.
Both these units you have will kill you as quick as look at you. Even if they have not been used in a while, if the capacitors were not dicharged and earthed properly, they will bite. Be careful !
I took half of it off my truck last night. (it comes in two pieces).
It has about 200 feet of 1/0 welding cable. One 100 ft piece and more smaller pieces, with weird connectors. The use of this cable is to securely ground this set, as it is apparently unsafe when not grounded.
One cabinet is the high voltage power supply, going up to 20 kV DC. It has a twistlock 120V plug, I am not sure what is the amp rating on this machine.
The other cabinet (still in my truck) is the THUMPER unit, that is, a big capacitor and means to discharge it into the object being tested.
There is at least one HV cable that goes from thumper to power supply (to charge the caps in thumper). and a long HV cable that, I think, connects to the cable being tested for faults.
Associated research no longer supports this unit, has no manuals and no old people to remember anything about it. Another victim of corporate buyouts, outsourcings, downsizings etc.
I will try to find out what is the power rating.
I will try to test it the following way:
- ground the unit securely to my house grounding rod
- run it off the generator to prevent interference with the house electrical system
- Connect leads of THUMPER to some thin wire, like 18 gauge wire, so that it would safely explode when THUMPED.