Bus Bar Current Collect Wearing Out Quickly

Are you talking about current transformers with an open secondary?

No . I am talking about the powerrail for the cranes.

Oh. Too bad that was not described well in the first post.

What did the crane manufacturer say in response to the telephone call(s) that have been made to it on this topic?

There could be several reasons.....corrosive environment, overloaded, improper wiring, crane motor failing, damage to structure in some way, bad connection.....We would need good close-up pictures, ratings and current measurements, to even start....

...and so would the crane's manufacturer.

Were OEM parts installed, with warranty, or did the replacement parts "fall off the back of a lorry"?

It is troubling that <...no means a electrical guy...> is replacing <...current collectors on 380 v bus bar...> with all the safety implications that surround it.

One of the possible reasons that the things are wearing out quickly is installation otherwise than in accordance with the OEM's instructions. Those instructions cannot be seen from here.

What current are the bus bars rated at?

What current are the collectors rated at?

What current do the collectors carry: steady state and inrush?

Do the bus bars show any signs of damage/wearing out?

How long did the original collectors last?

Who manufactured the original collectors? Part numbers?

Who manufactured the replacements? Part numbers?

I am also no means an electrical guy.

What current are the bus bars rated at?

Not sure

What current are the collectors rated at?

200 amps

What current do the collectors carry: steady state and inrush?

Inrush

Do the bus bars show any signs of damage/wearing out?

One of the lines showing a bit of damage

How long did the original collectors last?

This is a fairly new plant May be around 6 months

Who manufactured the original collectors? Part numbers?

Wampfler

Who manufactured the replacements? Part numbers?

I am also no means an electrical guy.

Here they are. Pick up the phone!

Already called them before . They might visit our site next week

Then phone them again and convert <...might...> into "will", FFS!

• _{What is the matter with people these days (rhetorical question - NNTR)?}

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• _{What is the matter with people these days (rhetorical question - NNTR)? "}

_{Good chance that because so many use either text speak or technical abbreviations that are not universally know people have no clue what they are talking about and they ignore the advice given due to it's cryptic conveyance of anything useful.}

_{(FFS, OMG, NNTR, STFU,} LOL, WTF, FBI, SCr, HFe, CIA, NBS, PBS, MAGA, NIBY!)

You left out CNN, and NBC.

WTF...

Yes it could be a buildup of corrosion and carbon on the bars, possibly pitting....probably need to be cleaned....might try some conducting grease...

Possibly, though the forum cannot see the problem as well as the original poster, who seems to have vanished. Perhaps there are too many texts, emails and WhatsApps to send to maintain an interest here; who knows (rhetorical question - NNTR)?

Look carefully PWSlack - unusually for anonymouse posters, "plckid" has emerged.

We have checked for corrosion but we had found of the lines colour seems to be a bit of black as compare to others. I dont know why .Also the power rails are galvanized . Just one question ,how do they align these power rails. Is there any instrument for this since the manufacture thinks the rails are not aligned and the current collectors are wearing out soon.

Nah, it is probably something in your local environment that is causing black oxide.

Check your spring tension, they have probably relaxed, and with poor contact, may run hotter and relax sooner.

Yeah, when my contacts are weak, I run hotter, and want to relax sooner also.

Some thoughts.....

1. "Rough handed" operator engages collector with too much force.
2. Collector brought into contact with rail at start current when it should be off-load.
3. The busbar damage should have been repaired when collector was replaced.
4. The manufacturer will know what busbar alignment tools and methods are adequate.
5. The manufacturer might now sell you busbar dust covers which should have been specified for your environment?

Check the quality of the material. That is always the problem.