3M HV Splice Installation SC 145 Cross bonding

Demo installation

[@dagnachewtsega2746]

hi friends, I thank you for the video I get a lot from it. I have faced a problem in my 132kV underground cable stringing project, the cable size is 1000mm2 and the contractor proposes to use welding to connect the bare conductors. Do you think this is a good option to use welding instead crimping,

[@goranpevec9209]

Hi Gary.....want company are these jointers and special tools from?

[@ackwel1337]

The pex insulation looks very uneven on the right joint just before the semiconductor 🤨

[@VienDuHoang]

haha yeah. You are correct.

[@arrunden7127]

Indeed. Definitely going to see Air trapped there, then PD.

[@ziauddinahmad9507]

we want to training 132 kv joint and termination how is this possible I have done by 33 kv last

[@VienDuHoang]

Hi Admad, the skill set required for HV is actually higher than for MV, even at 33kV, and it also requires you to have big investment into professional tools. Depends on HV cable accessories manufacturers, some will request you to know how to use glass to remove semi-con layers and shaping the semi-con edge, or just using tool. Then, you'll need to now how to do sanding, to smooth XLPE surface. You need to contact your 3M local representatives to set up a training like this.

[@TheManLab7]

Less than a year old and for some reason your all ready back into the 60's. How can it take you 2 days to join a cable?! Also, has any told you what lead does to your body? 🤦🏻‍♂️

[@VienDuHoang]

I don't know if you have experience dealing with HV Cable Accessories. Have you ever done one ? From Prysmian, 3M, Tyco Raychem, LS, Pfisterer,... none can do within one day if including cable preparation. Even you have the best tool, you must also have the best cable, round perfectly.

[@TheManLab7]

@@VienDuHoang I couldn't count how many HV cables I've done in the past but I can't do them anymore as I lost my leg in a motorbike accident. I have had to splice and remake old pitch and lead cables in the past but I've never had to wait a day before I could start to terminate it.

[@VienDuHoang]

@@TheManLab7 At first, I'm sorry for your lost. Now I understand your story. Technology for Cable Accessories not changes much since your age. But the cable with XLPE insulation is the most common, especially in Asians. The HV cable (110kV and above) is big and so heavy (mostly we use 1200sqmm cable) that you'll need the hydraulic tool to bend the cable. So in most of the cases, the cable isn't straight. You need a straight cable to do the splice, termination to make a perfect fit to stress cone, insulation splice body, also make sure the cable contraction & expand during operation less complicated. You'll need to heat the cable to make it soft, then use the Al plate to make it straight. This process takes time, 3h+8h and mostly we let it overnight. With the straight cable we can use tool to remove the bonded semi-conducting layers. But then again, no perfectly round cable. All the tools I used leave the wave curve on XLPE surface, and a little semi-conducting layer line. Some Cable Accessories manufacturer don't require to use glass to make the smooth transition, but if they are China design, then you'll have to do it by glass, so it require a very well-trained skill set. That's why it is impossible to do all in one day. Normally we need 2 full days to install 1 splice.

[@VienDuHoang]

@@TheManLab7 Can you tell me what lead does to body of the splice ?

[@jluchford536]

XLPE (plastic) high voltage cables (usually 132kV and above) have to be straightened and annealed prior to jointing in order to obtain shrinkback and to reset the 'memory' of the cable. After prepping, heating and cooling in a straightening bar thats pretty much the first day over but i'd use the time to set up tooling on rig and check materials

[@chandan54kumar]

Cable preparation was not like professional