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1 GENERAL DESCRIPTION OF THE PROJECT
1 GENERAL DESCRIPTION OF THE PROJECT.................................................................................1
1.1 ELECTRICAL SCOPE OF WORKS............................................................................................................................................... .21.2 PROJECT DESIGN CRITERIA........................................................................................................................................................3
1.3 LV DISTRIBUTION..........................................................................................................................................................................4
1.3.1 SYSTEM OVERVIEW...................................................................................................................................................4
1.3.2 SYSTEM DESCRIPTION..............................................................................................................................................5
1.3.3 CONTROL.....................................................................................................................................................................6
1.3.4 EQUIPMENT.................................................................................................................................................................7
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1.1 ELECTRICAL SCOPE OF WORKS
The electrical services installations installed to the XXXXXXXX comprise:
1. Main LV distribution equipment including switchgear, distribution boards and cable
containment systems within the Basement Level electrical switch rooms.
2. Sub-main cable installation including mechanical services equipment, guest rooms and lift
installations including all cable containment, fixings, terminations etc.
3. Lighting installation complete with all emergency lighting etc. including luminaires, lamps,
controls, containment, final circuit wiring etc.
4. Lighting controls system.
5. Small power installation including supply, installation, terminations, and cable containment
systems etc
6. Site wide addressable fire alarm system including supply, installation, terminations, cablecontainment systems and commissioning.
7. TV/FM/Satellite System including supply, installation, terminations, cable containment
systems and commissioning.
8. Disabled toilet alarm system to cover all disabled guestrooms and public toilets.
9. Intercom system for the Disabled Refuge and Fire Brigade
10. Access control system for the guest rooms
11. Small Power and containment only for the Voice, Data and AV Systems.
12. CCTV monitoring system.
13. Earthing and bonding installation.
14. Testing and commissioning.
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1.2 PROJECT DESIGN CRITERIA
Service Main Electrical Equipment
Specification
UPS Loads Generator
Requirement
Power 1250 kW 100% 100%
Lighting 15 W/m² None 25 – 33% on EmergencyPacks
100%
Plantroom Areas Lighting 10 W/m² None 25 – 33% on EmergencyPacks
100%
UPS Room Lighting 10 W/m² None 25 – 33% on EmergencyPacks
100%
Battery Room Lighting 10 W/m² None 25 – 33% on EmergencyPacks
100%
Security Systems <1 W/m2 None 100% on Separate UPS 100%
BMS <1 W/m2 None 100% on Separate UPS 100%
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1.3 LV DISTRIBUTION
1.3.1 SYSTEM OVERVIEW
The LV electrical system served by the Packaged Sub-Station and switchboards located within theXXXXXXXX Switchrooms and consists of the following major items of equipment as detailed on
record drawings XXXXXXXX located in Section 9 of these manuals.
1. Package Sub Station Switchboard PSS 1A - supplied from the A Stream HV ring (DRUPS)
supply with secondary generator back up supplies.
2. Package Sub Station Switchboard PSS 1B - supplied from the B Stream HV ring (DRUPS)
supply.
HV cabling has been installed between the HV Switchboards and the incoming terminals of thetransformer. HV Cabling rated to 11kV has been installed between the HV Switchgear. The HV
cabling installed consists of 11kV rated red sheathed, XLPE/SWA/LSZH 3 core cables with copper
tape screen to B.S.6622 type TCTA, cleated to ladder racks.
Control cabling comprises of Multicore 600/1000V grade, XLPE or PVC insulated, SWA cabling
installed between the control sections of the HV switchgear.
All distribution switchboards utilise air circuit breakers and moulded case circuit breakers and have
been fitted with protection arrangements, interface devices and terminals to facilitate the remote
status monitoring to the PMS and BMS systems.
All circuit breakers and protection have been interfaced with the PMS and BMS via terminal units
located in each Switchboard. The interconnecting control and monitoring wiring comprises of multi-
core screened flexible multi-core LSF screened cabling installed to cable trays.
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1.3.2 SYSTEM DESCRIPTION
The packaged substation consists of HV and LV sections coupled together by an 11kV/415V cast
resin transformer and comprising of the following components. The switchboards are described as
follows with more fully detailed information located in ZZ Switchgear manual. The ACB and MCCB
positions are provided with remote monitoring to monitor all conditions and device status interfaced torelay with the PMS & BMS systems.
Sub-main cable distribution systems from the LV switchboard have been routed on a network of cable
ladders and trays and as indicated on the Distribution Schematics/ layout drawings. The low voltage
sub-main cables generally comprise XLPE/SWA/LSF cables.
The switchboard has been provided with the following ACBs and MCCBs and on the incoming and
outgoing ways as detailed in the table below.
SUB SWITCHBOARD PSS 1AWAY REFERENCE MCCB / ACB / FUSE
INCOMING / OUTGOING ACB
SUPPLY FROM HV/1A via TRANSFORMER TXA 4000 TP&N ACB (NORMALLY CLOSED)
OUTGOING WAY
UPS 1 SUPPLY 1600A 4P ACB (NORMALLY CLOSED)
UPS 2 SUPPLY 1600A 4P ACB (NORMALLY CLOSED)
UPS 3 SUPPLY 1600A 4P ACB (NORMALLY CLOSED)
UPS 4 SUPPLY (FUTURE) 1600A ACB CHASSIS
STATIC BYPASS 3200A TP&N ACB (NORMALLY CLOSED)
MAINTENANCE BYPASS SUPPLY 2500A 4P ACB (NORMALLY CLOSED)
POWER FACTOR CORRECTION EQUIPMENT (FUTURE) 1000A TP&N CHASSIS
TRIPPING BATTERY SUPPLY 100A TP&N FIXED FUSE SWITCH
5 NO SPARE WAYS 160A TP&N MCCB PLUG IN BASE
2 NO SPARE WAYS 100A TP&N MCCB PLUG IN BASE
TRANSIENT OVERVOLTAGE PROTECTION 200A TP&N FUSES
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1.3.3 CONTROL
The Package Sub Switchboards are provided with incoming power to the 11kV/415V transformers
which are connected to the incoming section of the LV switchboards. The Package Sub Switchboards
are provided with an emergency power off (EPO) system which will shut down the LV switchboards
when activated. The system forms part of the REF (restricted earth fault) relay system andtransformer temperature monitoring system as detailed within the HV Distribution system in Section 2
of this manual.
The UPS is connected via the Landlords LV Switchboard PSS 1A which can be used to bypass the
UPS and feed the critical load with raw mains power (from DRUPS Power Station D). A Castell
interlock system prevents the bypass circuit from being activated unless the UPS units are in static
bypass, preventing damage to the UPS system. The Bypass Panel also provides complete isolation
of each of the UPS and SBM units such that the devices can be serviced or even completely replaced
without removing power to the critical load.
The UPS Output Switchboard A1 is split into two sections via an ACB normally closed bus coupler. In
the event of loss of power to Stream A the switchboard provides essential no break supplies to the
PDU 1A. The switching procedures are detailed within the Section 7 XXXX Operating and
Maintenance Manuals.
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1.3.4 EQUIPMENT
1.3.4.1 LV SWITCHBOARDS
The switchboards are floor mounted, free standing boards and comprise single busbar system,incorporating incoming and outgoing ways with final circuit protection via ACB's, MCCB's and HRC
fuses. The switchboards are designed for front operation and are constructed to the requirements of
BSEN 60947. The switchboards are air insulated and have mechanical ingress protection rated at
IP31 in accordance with IEC62271-200.
All package switchboards have been protected against transient over voltage by means of electronic
protection devices.
The switchboards are designed for the following operations to be performed safely when the
assembly is in service and under load:
1. Visual inspection of switching devices and other apparatus; settings and indicators of relays
and releases; conductor connections and markings
2. Adjustment and re-setting of relays, releases and electronic devices
3. Replacement of fuse links
4. Replacement of indicating lamps
5. Testing and calibration of metering and protection units
6. Thermal scanning of connections via a thermal imaging window
BUSBARS
The busbars comprise of rectangular section, hard drawn, high conductivity copper bars which are air
insulated and are designed to withstand the fault level for 1 second. Fully rated phase and enhanced
neutral busbars (150%) are provided within the package substation and UPS output switchboards.
Fully rated phase and neutral busbars are provided within the mechanical services switchboard.
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1.3.4.2 TRANSFORMER
The transformers consist of a vacuum cast coil dry transformer enclosed within the HV Section of the
Packaged Substation panel. The transformers ambient rooms conditions are cooled to provide a
maximum temperature of 40 deg C.
Each transformer is enclosed in ventilated enclosure with access to the transformer via front accessdoors. These doors are provided with mechanical Castell key safety interlocks to prevent
unauthorised opening and tampering. The transformer is provided with over current, short circuit
current, earth fault, and restricted earth fault protection. Transformer windings are fitted with internal
overheat temperature sensors/thermostats and terminals to provide overheat condition audible and
visual alarm indication and trip remote indication to the PMS., together with terminals to shunt trip the
transformers primary side protection circuit breaker, as indicated on the manufacturers drawings.
In addition current transformers (CT's) have been installed to monitor current flow to earth, placed
around the transformers star connection earthing conductor. This 'reference earth' current transformer
(CT) is connected to facilitate the shunt trip operation of transformers secondary side LV ACB circuitbreaker, as indicated on the manufacturers drawings.
In the event of the LV ACB or HV VCB being tripped due to operation of the transformer high
temperature cut-out or restricted earth fault relay operating, the ACB and VCB will need to be reset
once the cause of the fault has been rectified.
1.3.4.3 AIR CIRCUIT BREAKERS (ACB'S)
Each switching device is operated by means of energy stored in a manually charged spring with both
manual and electrical releases with indication of both 'Charged' and 'Discharged' status.
Both the incoming and outgoing ACB's comprise of manually operated stored energy, withdrawable
pattern fitted with CT operated solid state over-current plus earth fault protection relays, tripping
device providing adjustable long time, short-time and instantaneous tripping characteristics.
Padlocking facilities have been provided to prevent breaker operation, maintain isolation and include
facilities to prevent the operation of the ON and/or OFF buttons and the facility of padlocking the ACB
in the disconnected (withdrawn) position.
The ACBs are provided with electronic (Micrologic 2.0/5.0) trip units as detailed in the equipment
schedules of this manual.
1.3.4.4 MULTIFUNCTION POWER METERS
The switchboards have multifunction power meters to measure various parameters including Voltage,
Current, Power, Power Factor, Frequency, etc which can be viewed on the meter display.
All meters are powered from the 24V dc battery tripping system and are linked together via a Modus
comms system back to the interface section. All meters are fitted with appropriately rated current
transformers and fused sensing supply. The meters are connected to the PMS using RS485 cable
connected to a common terminal block in the bus-section panel.
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1.3.4.5 SURGE PROTECTION
The surge protection device provides protection against voltage surges typically induced on the mains
typically by lightning strikes. The unit is provided with remote visual indication in the event of a fault.
The unit provides the following operation and indication elements:
1. Green Only - Full protection, power ON.
2. Green + Red - WARNING: Reduced protection, replace unit as soon as possible.
3. Red only = NO PROTECTION. Replace unit immediately.
4. No Lights = NO power connection or fault. Check external fuses and connections.
A reduced protection remote indication facility via a normally open and a normally closed volt free
contact. The normally open (NO) contact is open when the ESP unit is healthy and power is present.
The normally closed (NC) contact is closed when the unit is healthy and power is present.
In addition to a warning of the reduced protection state, the normally closed volt free contact can also
be used to signal power loss on one or more phases.
1.3.4.6 EARTH FAULT PROTECTION & INTERTRIP RELAY
The Switch panels are fitted with a MCAG type stabilized earth fault current relay that provides zero-
current differential protection of the star point winding (restricted earth fault) of a transformer. The
output is monitored by the PMS.
The MCAG14 REF Relay is powered by 24V DC supply. In the event of an over current or earth fault
scenario being detected by the Relay, the HV Breaker will be inter-tripped and trip off the Mains
incoming ACB.
The status of the trip will be indicated by the LED on the front of the unit.
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1.3.4.7 TRIPPING BATTERIES
Each of the switchboards are provided with battery and charger units, providing 24Vdc supplies for
the tripping, closing and auxiliary supplies to the integral control devices.
Each unit incorporates a sealed lead acid battery and an automatic constant voltage charger, whichprovides 24 hour standby capacity.
Each tripping battery unit has the following features:
1. Input voltage 230V ac, single phase +/-10%
2. Voltage drop at full load 2%
3. Battery capacity suitable for 3 open/close operations of all devices without recharge. Full
recharge is achieved in 24hours
4. Lead acid sealed cell to BS6290 Part 4 with a design life of 5 years
5. Battery monitor to show Battery voltage (V), Battery charge/discharge current (A), Ampere-hours consumed (Ah), State of charge (%), Time to go at the current rate of discharge, visual
and audible alarm for over and under voltage, and/or battery discharged.
6. Indicator lamps to provide indication of Mains earth, Low Battery Volts, Charger Fail, Power
supply Fail, Battery Protection activated, fuse failure.
7. Battery protection unit to disconnect the battery from non essential loads before it is completely
discharged (which would damage the battery) or before it has insufficient power left.
A common alarm will be raised at the PMS upon charger failure or output failure.
All units are fitted with a charge fail alarm relay linked to the PMS via a set of volt-free contacts.
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