All
I'm in the UK and a couple of years ago bought a 3kVA inverter generator badged Bohmer AG I-5000. I believe the same set is also badged Clarke Power 3400W. The generator was always an absolute pig to start and during the last power outage I'll put my hand up to giving it a blast of easy...
All
I'm looking for a PDF copy of the Brook technical info for 3 and 4kW 415V 50Hz motors.
I'm not sure whether they were trading as Brook Crompton, Brook Hansen or Crompton Parkinson at that time.
A copy or pointer towards a site would be great.
I've had loads of the catalogues over the...
All
I'm looking to source a replacement panel heater.
ATEX Exd IIC T5
250V
200W
readily available to the UK.
Preference is a single 200W heater but if I need to make the wattage from several heaters so be it. Our single phase voltage is healthy and well exceeds 230V.
Any ideas on...
On with some maintenance on an 11kV board.
Knowns - we know the utility supply cable is in poor state but that's their cables.
our incoming switch is out of the board.
The bushings have been examined and are as new.
Connections at the back are shrouded but appear good and have not been touched...
Has anyone got experience with the now defunct Terasaki AT25 ACB.
The breaker is on a 415V LV system and rated at 2500A. Nice cosy environment, never been used on a fault in anger, not very many operations and about 25 years old.
The auto close mechanism is in good condition but caked in OEMs...
Hi
I've got an 11kV generator which is delivering just over 2MW.
Over the last 6 weeks the exciter current has started to climb and gone from the expected of 1.5A to 2.5A.
The winding temps have also increased by 15 to 20degC from the expected mid 60degC and is now fluctuating between 60 and...
All
Got a potential Ex failure on an external LV distribution board. Its an Exe board and has been in place for over 25 years.
Loads of cables enter through a brass gland plate at the bottom. The gland plate is threaded but only 4mm thick. Locknuts and IP washers are not in place.
The...
I’ve got to take about 600A from a 500kVA transformer. The calcs are taking me to 300mm singles or 400mm 4c.
400mm I can’t accommodate the bending radius so that’s out. The gland plate on the transformer is mild steel so with the singles I’m on route to creating a large induction cooker...
All
I'm running 3 phases and a neutral as separate cores in trefoil from a transformer.
The cores separate when I get to the metal frame transit. All phases run through the same aperture.
Do I need to apply a saw cut to prevent induction heating at the transit frame?
All
I've got a Whipp and Bourne 11kV switchboard full of VCBs. The Switchboard is about 25 years old, lives in a warm drive clean switchroom and has a very easy life as regards switching duties.
Every 4 years the VCBs are racked out, maintained and proved to OEM spec. (time trials, hi pot...
Gents
I've had a request from one of my guys to use a personal glucose monitor and pump to control a diabetes situation. I've got ATEX issues but can work around them. Has anyone had experience with these devices. Do I need to be thinking about exclusion zones around equipment with high...
Guys
I'm looking for advice on how to test surge arrestors installed for lightning protection.
I've got several cathodically protected pipes. As the pipes emerge from underground they join the above ground pipework through insulated joints. Across the joints there are solid state surge...
Gents
I've had cause to use a couple of small contactors with timer blocks fitted to the top. I'm talking here 3 phase contactors with the main contacts rated at about 10A. The operating coil on the contactor is 24Vdc.
At FAT with a bench supply of closer 27Vdc and enough amps to run an arc...
Gents
I need to add a PQM to my 11kV board to give me a kW value I can use for comparison purposes, I'm not looking for fiscal accuracy.
The 11kV switchboard I've inherited has CL 0.2S metering Cts used by the supply utility for fiscal measurements.
As part of the inheritance and already...
All
I've got a 4MW 11kV gen set that has tripped several times on rate of change of frequency relay or ROCOF.
Early thoughts were that the process acting as the prime mover (turbo and process gas) had issues but after initial investigation this appears not to be the case. I could also get the...
