View source for Example: electrical installation in a printworks

{{Menu_MV_and_LV_architecture_selection_guide}}
== Brief description  ==

Printing of personalized mailshots intended for mail order sales. 

== Installation characteristics  ==

{{tb-start|id=Tab1089|num=|title=|cols=3}}
{| class="wikitable"
|-
! Characteristic 
! Category
|-
| Activity 
| Mechanical
|-
| Site topology 
| single storey building 10000m<sup>2</sup> (8000m<sup>2</sup> dedicated to the process, 2000m<sup>2</sup> for ancillary areas)
|-
| Layout latitude 
| High
|-
| Service reliability 
| Standard
|-
| Maintainability 
| Standard
|-
| Installation flexibility 
| 
* No flexibility planned:
** HVAC
** Process utilities
** Office power supply 
* Possible flexibility:
** finishing, putting in envelopes
** special machines, installed at a later date
** rotary machines (uncertainty at the draft design stage)
|-
| Power demand 
| 3500kVA
|-
| Load distribution 
| Intermediate distribution
|-
| Power interruptions sensitivity
| 
*Sheddable circuits:
** offices (apart from PC power sockets)
** air conditioning, office heating
** social premises
** maintenance premises 
*long interruptions acceptable:
**printing machines
**workshop HVAC (hygrometric control
**Finishing, envelope filling
**Process utilities (compressor, recycling of cooled water) 
*No interruptions acceptable:
**servers, office PCs
|-
| Disturbance sensitivity 
| 
*Average sensitivity:
**motors, lighting
*High sensitivity:
**IT

No special precaution to be taken due to the connection to the EdF network (low level of disturbance)
|-
| Disturbance capability 
| Non disturbing
|-
| Other constraints 
| 
*Building with lightning classification: lightning surge arresters installed 
*Power supply by overhead single feeder line
|}

== Technological characteristics  ==

{{tb-start|id=Tab1090|num=|title=|cols=3}}
{| class="wikitable"
|-
! Criteria 
! Category
|-
| Service conditions
| 
*IP: standard (no dust, no water protection) 
*IK: standard (use of technical pits, dedicated premises) 
*°C: standard (temperature regulation)
|-
| Required service index 
| 211
|-
| Offer availability by country 
| No problem (project carried out in Europe)
|-
| Other criteria 
| Not applicable
|}

== Architecture assessment criteria ==

{{tb-start|id=Tab1091|num=|title=|cols=3}}
{| class="wikitable"
|-
! Criteria 
! Category
|-
| [[Architecture assessment criteria#On-site work time|On-site work time]] 
| Standard
|-
| Environmental impact 
| Minimal: compliance with European standard regulations
|-
| [[Architecture assessment criteria#Preventive maintenance level|Preventive maintenance]] costs 
| Standard
|-
| [[Architecture assessment criteria#Availability of electrical power supply|Power supply availability]]
| Tier 1
|}

=== Step 1: Architecture fundamentals  ===

{{tb-start|id=Tab1092|num=|title=|cols=4}}
{| class="wikitable"
|-
! Choice 
! Main criteria 
! Solution
|-
| Connection to upstream network
| Isolated site, 3500 kVA
| MV single-line service
|-
| MV Circuits 
| Layout + criticality 
| single feeder
|-
| Number of transformers 
| Power > 2500kVA 
| 2 x 2000kVA
|-
| Number and distribution of substations 
| Surface area and power distribution
| 2 possible solutions: 1 substation or 2 substations
*if 1 substations: Normaly open bus-coupler between MLVS
*if 2 substations: Main LV switchboard interconnected by a busway
|-
| MV Generator 
| Site activity 
| No
|}

{{FigImage|DB422144_EN|svg|D31|Two possible single-line diagrams}}

=== Step 2: Architecture details  ===

{{tb-start|id=Tab1093|num=|title=|cols=4}}
{| class="wikitable"
|-
! Choice 
! Main criteria 
! Solution
|-
| Layout 
| Service conditions 
| Dedicated premises
|-
| LV circuit configuration 
| 2 transformers, requested by the power demand
| Solution from fig.D22 or D23 are possible
|-
| Centralized or distributed layout 
| Uniform loads, distributed power, scalability possibilities 
Non-uniform loads, direct link from MLVS 
| 
* Decentralized with busbar trunking: 
** finishing sector, envelope filling  
* Centralized with cables: 
** special machines, rotary machines, HVAC, process utilities, offices (2 switchboards), office air conditioning, social premises, maintenance
|-
| Presence of back-up generator
| Criticality ≤ low 
Network availability: standard 
| No back-up generator
|-
| Presence of UPS 
| Criticality 
| UPS unit for IT devices and office workstations
|}

{{FigImage|DB422145_EN|svg|D32|Detailed single-line diagram (1 substation based on fig.D22)}}

{{FigImage|DB422146_EN|svg|D33|Detailed single-line diagram (2 substation based on fig.D24)}}

== Choice of technological solutions  ==

{{tb-start|id=Tab1094|num=|title=|cols=4}}
{| class="wikitable"
|-
! Choice 
! Main criteria 
! Solution
|-
| MV/LV substation 
| Service conditions 
| indoor (dedicated premises)
|-
| MV switchboard 
| Offer availability by country 
| SM6 (installation in Europe)
|-
| Transformers 
| Service conditions 
| cast resin transfo (avoids constraints related to oil)
|-
| LV switchboard 
| Service conditions, service index for LV switchboards 
| MLVS: Prisma P 
Sub-distribution: Prisma
|-
| Busway 
| Load distribution 
| Canalis KS (fig.D32 or D33) 
Canalis KT for main distribution (fig D33)
|-
| UPS units 
| Installed power to be supplied, back-up time
| Galaxy PW
|-
| Power factor correction
| style="width: 250px" | Reactive power to provide for the minimum up to the full load without harmonic (see chapter [[Power Factor Correction]] for more information), presence of harmonics 
| LV automatic compensation (without detuned reactor).
|}