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Mardix Switchgear iPDU Specification Switchgear Specification Request iPDU Specification Switchgear Specification information
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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.

Information associated with: Mardix Switchgear - Power Distribution Units, UPS, Switchboards & Packaged Substations

 

iPDU Static transfer switch

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Mardix Switchgear
Westmorland Business Park
Kendal
Cumbria
LA9 6NS

Tel: 01539 720161
Fax: 01539 724384

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