Category: Mardix Switchgear iPDU Specification Switchgear
Specification
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Mardix Switchgear
iPDU Specification
Specification for iPDU with Static Transfer Switch
A. General:
The iPDU comprises one or more vertically mounted sections
generally arranged as drawing ref xxxx-xxx. The sections are slab
mounted on purpose built individual steel plinths with all operational
parts at a height referenced to the raised floor not the structural slab
level. Design and construction of the iPDU is in accordance with BSEN
60439-1:1999. B. Thermal Imaging:
The iPDU will be designed and manufactured in-line
with the requirement for thermal imaging. Thermal imaging shall be
possible without the need to open any internal covers. This is achieved
by the use of flush mounted outer doors, which in turn access the
secondary inner doors. The Mardix dual door system ensures the IP rating
of the iPDU is never compromised. Thermal imaging grids will be punched
directly into the steel doors and covers using CNC cluster punching.
Polycarbonate and industrialised PVC custom-made shrouds shall be fitted
over connection points to prevent the inadvertent touching of any live
parts and to facilitate safe thermal imaging.
The custom-made shrouds shall be laser cut from sheet material and
folded and tied to form a rigid barrier. Each barrier will also be laser
profiled with slots positioned in such a way to facilitate efficient
thermal imaging of the connection point. Cold punched slots will not be
used. C. Enclosure:
The enclosures are manufactured using zintec coated sheet
steel which is fully welded and ground providing clean lines and maximum
rigidity. The enclosure is formed using individually folded panels which
when fitted and welded together forms a high integrity earth bond. An
integral plinth is then welded to form a solid support channel which
enables the iPDU to be mounted on an underfloor plinth. The enclosure
will be Powder Coated:
- Internal compartments: RAL 9003 Durable - Ripple Effect (white)
- Cabinet: RAL xxxx – Smooth Finish Semi Gloss
- Doors: RAL xxxx – Smooth Finish Semi Gloss
D. Unit Dimensions:
Refer to General Arrangement drawing ref xxxx-xxx E. Internal Separation:
Separation will be achieved in accordance with BSEN 60439-1:1999. The exact form of separation e.g. Form 4 (2) will be
as specified. Separation will generally meet the following conditions:
- Protection against contact with live parts belonging to adjacent
functional units
- Limitation of the probability of initiating arc faults
- Protection against the passing of solid foreign objects from one
function unit to another
Mardix internal separation will generally be achieved using rigid
metallic barriers. Unless otherwise specified busbars will be separated
from functional units.
F. Doors & Covers:
iPDU enclosures will be IP31. All hinges will be of
the concealed type. The iPDU will have hinged inner doors, which cover
the individual compartments and terminal chambers. 90-degree turn
latches will be used to lock each compartment. A special tool will be
required to open the doors. Screw fix internal covers will be
unacceptable.
The enclosure is then fitted with lockable-hinged outer doors. These are
doors are fully removable using a quick release shooting bolt system.
Double outer doors will utilise a three-point centre latching system.
(Top, bottom and middle)
The outer doors where applicable will be complete with polycarbonate
viewing windows sealed with rubber profiling strip. G. Underfloor Plinths:
iPDUs will generally be supplied with an under
floor plinth. The plinth will be manufactured using zintec coated sheet
steel which is fully welded and ground providing clean lines and maximum
rigidity. Adjustable screw jacks with at least 20 mm of adjustment will
be provided as a minimum at the corner of each plinth section to enable
proper alignment with the raised floor. The adjusting bolts will have
spreader plates placed under the bolt head. The plinth will be fitted
with vertically mounted gland plates pre-punched with 20mm holes, fully
accommodating the required amount of outgoing ways. H. Static Transfer Switch Section/Active Harmonic Filter Section:
The
STS is mounted in its own cubicle section with space above for future
Active Harmonic Filter up to 45Ampere. The cubicle is fitted with full
lockable double outer doors. The STS control/mimic panel is attached to
the associated outer door to ensure it is visible and accessible when
the outer door is closed. Ventilation is achieved through a large
ventilation grill on the top of the cubicle. The ventilation cut-out can
also house extract cooling fans if an AHF is fitted at a later date when
required. The facility to retro-fit a fan control switch is also
available. The STS is mounted such that if any maintenance is required,
easy access can be achieved. If the STS has to be removed this can be
achieved without interruption to the load. I. Input/Output/Bypass Section:
This cubicle section houses the input,
output and bypass switches. The cubicle is fitted with lockable double
outer doors. Castell interlocks are used to prevent the inadvertent
paralleling of supplies. The incoming MCCBs shall be segregated to
minimum Form 4(6).
Each MCCB is installed with volt free on/off and tripped auxiliaries
wired to control terminals. The auxiliaries are required to interface
with the Static Transfer Switch and for interface with the integral HMI
touchscreen. All MCCBs in this section shall have external rotary
handles mounted on the inner doors, via an extendable shaft. The rotary
handle allows the inner door to be interlocked with the MCCB in the
closed position. When interlocked, access to the switch cannot be
achieved; the MCCB must be opened to access the switch compartment. If
required the interlock can be bypassed using a special tool. The maximum
capacity for customer incoming cables is as specified. J. Monitoring/Control Section:
- The iPDU shall incorporate an integral LCD touchscreen HMI display
capable of displaying active iPDU measurements and status through
individual screens
- The integral HMI display shall provide the ability to disable
individual outgoing circuit alarms and to set user-defined overcurrent
set point alarms via password protected facility
- All iPDU MCCB breaker status shall be actively monitored; green to
denote closed, yellow to denote open (normally open) and red to denote
tripped or open (normally closed)
- The integral HMI display shall indicate real-time monitored values of
all individual outgoing circuits via Branch Power Metering to indicate
current (A), real power (kW), apparent power (kVA), power factor and
real energy (kWh) with individual current transducers rated
for up to 50 amps with an accuracy of +/-1% for greater than
10% of rating
Each outgoing circuit shall have an undercurrent alarm (for indication
of MCB trip or open on load) and overcurrent alarm which shall be
automatically enabled upon detection of load current.
- The integral HMI display shall provide the ability to disable
individual outgoing circuit alarms to set user-defined undercurrent and overcurrent
set point alarms via a password protected facility
- The integral HMI display shall provide real-time monitoring of
temperatures within the input/output section, distribution section and,
where fitted, the static transfer switch section and active harmonic
filter or isolation transformer section via a graphical mimic with the
ability to set user-defined setpoint alarms
- The integral HMI display shall provide real-time monitoring of
individual door status (open/closed) via a graphical mimic
- For iPDUs fitted with a Static Transfer Switch the
integral HMI display shall provide real time status
indication, measurements and alarms
- The integral HMI display shall provide real-time indication of the
following total distribution supply metering and power quality
measurements: voltages (phase-phase and phase-neutral), currents (phase
and neutral), total real power (kW), total apparent power (kVA), average
power factor, real energy (kWh), frequency (Hz), Total
Harmonic Distortion voltage (%), Total Harmonic Distortion
current (%) and individual harmonic analysis of harmonics
for voltage (up to 25th) and current (to 49th)
- The integral HMI shall provide indication of the previous 100no.
alarms with pickup and dropout dates and times
- It should be possible to navigate through all of the integral HMI
display’s screens via clearly labelled hyperlinks buttons. It should
also be possible to navigate from the ‘home’ screen directly to an
active alarm indication without the requirement to interrogate
individual screens
- The iPDU shall have internal communications diagnostics to alert the
user to a communications failure and the device(s) affected
- It should be possible to connect the iPDU directly to an Ethernet
TCP/IP Local Area Network via UTP Cat5e connection to enable remote
monitoring of all real-time information and alarms available from the
integral HMI display and data logging for historical data analysis to be
performed by the iPDU manufacturer’s specialist monitoring and analysis
software
- The iPDU manufacturer shall fully commission and test all functions of
the iPDU including individual outgoing circuit monitoring at their
factory prior to delivery to site
- 1 no. Electronic Surge Protector – connected to load busbars
- Shrouded EPO trip pushbutton if required
K. Distribution Section:
This section is fitted with a lockable top busbar chamber cover and a full outer door fitted with a viewing window
in front of the miniature circuit breakers to view the status of MCB’s
without the need to gain access to the iPDU.
This section has three segregated compartments: 1. MCCB plug-in base for connection of future distribution sections
whilst live. This compartment has a plug-in base installed (no MCCB
fitted). The base has individual shrouds for each set of terminals. When
an additional distribution section is required it is cabled to the dead
side of the plug-in base. An MCCB is then inserted into the base to
energise the new section.
2. Miniature Circuit Breakers (MCBs)
These segregated compartments each house a 3 pole MCCB protecting a 24
way TP&N MCB pan assembly. The MCB pan assembly is mounted vertically
giving a combined capacity of 24 way TP&N / 72 way SP&N outgoing ways.
Each individual MCB single pole way can be isolated from the pan
assembly internal busbars, using a sliding switch (Merlin Gerin Isobar
MCB pan assembly only). The arrangement of the MCBs will be such that
alterations to the circuit breaker and cabling shall be possible without
contravening the HSE requirements. Each individual outgoing way is
pre-wired in 6mmsq tri-rated cable to a low level separate terminal
chamber. Individual Current Transducers are installed around each
pre-wired outgoing way. The information from the Current Transducers is
transmitted to Branch Power Meters in the iPDU section. See Section K.
As a factory fitted standard the MCB pan assembly will be fully
populated with MCBs. Each pan assembly is individually sectionalised
with a lockable hinged inner door. The MCB toggles protrude through the
cut-outs in the inner door to enable switching whilst the door is
closed. 3. Separate Terminal Chamber
This compartment houses the vertically mounted outgoing terminals,
neutral bars and clean/dirty earth bars. All terminals in this section
will accommodate a maximum cable size of 10mmsq. A cable management
system will be provided within the terminal area of each outgoing
section to facilitate the orderly installation and modification in the
future to any circuit without the wholesale disruption to adjacent
circuits. L. Labelling:
Traffolite labels of black lettering will be provided for
all components, meters, switches, indicating lamps devices, etc. Each
outgoing circuit will be identified adjacent to the MCB.
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