HV CABLE JOINTING USING 3 PIN CONNECTORS?

[mashaa]

Hello. We are trying to run a 200m 11KV cable from 6 alternators to a step up transformer (11/33KV). However we can only get 35m long cables. Is it GOOD practice to join the 35m cables using 3 pin industrial connectors (Male/Female (?)) to attain the required 200m of 11KV cable? What are the technical and safety Implications for doing this? Which is the best way to join the HV cable? Any particular standard out there that i can use as reference?

**I am not an electrical engineer, and i am only looking at this scenario from GOOD practice and SAFETY point of view.

Mashaa (Uganda)

 

[7anoter4]

The 3 pins connector is rated for low voltage, I suppose.
You have to use an approved cable joint for 11kv as[for instance]:

http://www.cablejoints.co.uk/sub-product-details/hv-heat-shrink-cable-joints-cable-terminations

or:

http://www.jointingtech.co.uk/category.asp?categoryID=425

After the cable is laid and all the joints and terminations are in place you have to test the cable [hipot test and other according
to standard for instance IEC 60502-2 CH.20].
It is a British Standard BS 7197-for testing the performance of bonds for terminations and joints.

 

[mgtrp]

Connectors are available for MV applications, although I think that I'd tend to use a cable joint as 7anoter4 suggests above.

In general, the number of joints should be minimised or avoided altogether in cable runs as each joint represents an additional potential point of failure and decreases the overall reliability of the cable run. Take care with where you place the joints - make sure that they're not near bends etc, and make sure the the person doing the jointing knows what they're doing.

 

[7anoter4]

There are connectors for Medium and High Voltage cables, indeed but not for middle of the cable -only at the end at switchgear,
transformer or junction box terminals. The connector has to be unlocked prior to opening- only after the breaker is open. I agree with you mgtrp it is not correct to put in operation from the beginning such
a short portion of a cable with a joint.