25 kV VCB Updates

[BMCK]

Hi Guys

I am researching VCB's used on trains in the UK, can anybody tell me who makes the VCB's for UK trains and on what type of EMU they are fitted. I'd be really interested to see any pictures if you have any. Thanks

 

[captainbigun]

Mostly Alstom (both the older twin bottle found on 313-322, some 87s, 89-91 and the later single bottle 323/325/365, 92, 390, Eurostar plus the Bombardier EMUs).

Siemens use a unit from Richards. Units from Secheron are likely to make an appearance in the UK soon.

 

[BMCK]

I see that TE Connectivity have a new VCB called the VESA which looks very different to the other designs I have seen. Have you seen this type?

 

[captainbigun]

That's the ex Tyco device. One of the latter still on the roof of 86424.

It uses electromagnetic as opposed to air operation. Not likely to see one in the UK any time soon.

 

[BMCK]

I heard they were going to be fitted on the Hitachi units, looks like there are no UK based manufacturers supplying this type of equipment anymore then :cry:

 

[captainbigun]

Actually, not sure what the 395s have, though I suspect it will be one of the designs already approved.

Preston still overhaul the Alstom VCBs including the 50kV variant. New units made at Tarbes.

 

[BMCK]

I noted your comment about electromagnetic mechanisms, Any reason why you think they won't be used on the trains, they seem to be used more and more on the track side switchgear?

 

[captainbigun]

An on-vehicle VCB had quite a high duty cycle, through vehicle preparation and disposal as well as neutral sections. Static HV gear doesn't have the same duty. With the Tyco unit there was concern around reliability and possible failure modes. Failing wrong side would be a real issue. Less of an issue with the established pneumatically operates devices.