Recent content by maunsell

its the engineering council's guidance note for connection of local embedded generation. the bit that i am confused with is the neutral/earthing arrangement. The problem being circulating currents that may exist along with a different earth potential ! Mark

Guys picture the scene! Two sockets side by side, one on a essential circuit one on non essential. under normal conditions loss of mains the generator picks up the essential load only. Ahhhh , but what if we load test the building with both the set and mains, do we have to syncronise the...

Sparksski Many thanks i also work in healthcare arena, on PFI bids. You could prove to be a very good ally

GerH Thanks . The starting of the standby sets bit is what interests me.i guess we would be looking at step loads and redundant PLC, etc. The Trust are parnoid about loss of supply. Given that its a PFI scheme the client wants the cheapest scheme avaialble therefore we -( the designers are...

Sparksski yes i am aware of tall the relevant HTM,s. we have 2No. MV incomers (same location) centralised LV generation is being proposed with step up (to 11kV) to support the MV closed ring. All the generators are to be linked to a synch.Bus. The problem you noted is that the /trust prefer...

Thanks Guys. i do mean a Medium Voltage ring, but the Trust are concerned that the scheme does not reflect any local LV embedded generation. Yes the sets will need to run in parallel with in other and soft start with DNO (only for load test. moving on the Trust i have since learn are now...

Guys i have had a search on this subject and found some useful stuff, however i need to provide the pros and cons for the following: 4 No. (2MV) LV sets stepped up to 11kv - site load 6MV (LV)N=1 X number of HV sets fed directly onto the MV ring. and LV embedded generation. all sets to run in...

i have been asked to carry out a THD calculation upon a 450 kVA 3 phase input rectifier load.i would be grateful if any one can point me in the direction of obtaining the relevant info. to carry out the necessary calculations. i am aware that i would need to carry out a background harmonic...

Guys!!!! i need to undertake a apprasil or suggest options for LV distribution within a hospital. i need to provide the Trust with a list of advantages and dis advantages basically for different types of options. My intentions or options will be catorigised as follows.. Types of Trannies...

i wonder whether someone can provide information regarding IEE BS 7671 wiring regs,a colleage has told me that when they undertook a trunking layout, they use 3 compartment to alleviate high grouping factors, furthermore that each compartment will contain only one phase, i do have an opinion on...

To all i have a situiation within a REC switchroom ,housing HV/LV equipment.The REC has requested2 No. earth pockets (normal)However,the main contractor has tried to install 2 No.Sealed earth electrode unsuccessfully.They have asked whether or not they could use the rebars as the earth path and...

Quick response, very impressive unsure of the change of speed ,although i understand that it can be done according to the load profile according to the type of building? The 60% savings are related to the running costs over a year.~With would therefore justisfy the 10% uplift on the capital...

Good afternoon chaps i have been asked to look into the 2 different methods of drive control for escalators, that being tradiontal methods and a VVSD( voltage Variable Speed Drive) which i believe consists of a frequency regulator. I have been tasked with assessing whether or not it justiifes...

Ok this would be my first time ,so be gently with me. i am trying to obtain the low down on generator sets and the synchronising of such plant with the mains.i am currently about to underake a desgin on a hospital that currently has an 1 year old 1000 kVa set.We are to extend this and provide...