Intelligent Power Distribution Units (PDU)

Immunity to supply disturbances
Thermal Stability
Harmonic Conditioning
Resilience of Supply
Ease of maintenance
General Specification
Intelligent Monitoring

E&I Engineering provide industry leading PDU solutions that are truly specific to end user requirements. Utilising the high quality construction of our type-tested modular metalwork system gives the flexibility to provide any combination of components / equipment to be fitted without compromising our construction standards.

Our latest developments have been to add a layer of intelligence and monitoring to allow end user management with minimal cabling requirement. E&I have long developed SCADA and EMS systems in arrange of industries and have applied that expertise with available technology to configure final circuit current, power and energy monitoring down to individual server rack level. Alarms, status diagnostics, and essential measurements are also integrated to ensure effective critical power management.

Immunity to supply disturbances

E&I design our systems to be particularly immune to disturbances associated with arcing from induced or direct over voltage transients. The use of large phase separation and close-coupled transient suppression equipment ensure system security. The form of construction and materials used offer excellent arc-extinguishing properties.

We also offer a unique Fire-Trace self-extinguishing system option and we construct our equipment to specified forms of separation or in accordance with the highest requirements.

Thermal Stability

The use of proven predictive heat rise software calculations at design stage and a history of completing full load heat rise teats ensures the integrity of the metalwork design. The modular system design allows thermal imaging to be undertaken and on-line thermocouple based monitoring systems can be installed.

Fluctuating electrical loads can cause compound heating and cooling assemblies and conductor joints. E&I utilise the highest spec compound to ensure constant joint pressure, irrespective of temperature.

Harmonic Conditioning

The highly computerised / electronics loads which are fed from PDU units can result in voltage distortions to the system. An accurate assessment of this non-linear element is essential at design stage and we can assist using specialist predictive software, or by site survey with harmonic analysis.

To minimise this and ensure compliance with the requirements for G5/4, E&I have several solutions that can be incorporated depending on application requirements and size constraints;

Unique active harmonic compensators using passive technology
Active harmonic solid-state conditioners
Fixed frequency filters
Hi-isolation transformers with high common mode rejection ratios;

A full specialist technical service is offered to ensure that the best solution is found for the application.

Resilience of Supply

The critical loads that are generally fed from PDU units require resilience and no break changeover in event of a supply fault or failure. Incorporation of static transfer switches within the units will ensure a changeover to alternate supply within 5-10msecs and ensure security of final circuit supply.

Ease of maintenance

All components are easily accessible. All circuit breakers of the plug-in type can be replaced immediately. The facility is provided to undertake the following safely whilst the equipment is live:

Transformer replacement
STS replacement
MCCB / MCB changes
Final circuit alternations
Surge arrestor changes
Thermocouple / infrared sensor changes
Control Relay replacement / alteration
Fan replacement

General Specification

Modular metalwork system mild steel with epoxy paint finish standard colour RAL 7035 - All colours available/Lifting facilities/Specialist adjustable extended plinths for sub-floor support c/w glanding plates (pre-punched option available) and tile supports as necessary/IP54 ratings available/Clean and Dirty Earth Bars/Glazed Door options/Component Replacement/maintenance/Front / Rear equipment mounting/Versatile cabling arrangements/Designed and tested IEC 61439-1

Features and options available

Fully welded and modular sheet steel construction cubicles available
3P and 4P static transfer switches (STSs)
Isolation transformer to reduce harmonics with zero phase shift (harmonic cancellation and no-break by-pass)
Active Harmonic Filters (AHFs)
Intelligent metering and Touch screen interfaces including active power flow mimics and final circuit status
Interface to remote SCADA systems using Ethernet protocol.
Final circuit monitoring
Infra red thermal monitoring
MCCB's (fixed or plug-in) switchfuses
Front /Rear equipment mounting, versatile cabling arrangements
Adjustable plinths
Electronic Surge Protection (ESP)
End of rack PDU also known as RPPs (Remote power panels)
Commando plug and socket PDUs
Modular wiring options for outgoing circuits
Clean and dirty earthing arrangements
UK and European PDUs including double pole (DP) and four pole (4P) devices (TNS applications)

Intelligent Monitoring

Simple, space and cost saving CT monitoring strips to align with mcb pan assemblies with a single RS485 interface to allow monitoring and management of individual final circuit energy (kWh), real power (kW), current (A), apparent power (kVA) and power factor.

Configurable intelligent operator interface with continuous record of events through alarm logs.
Simplified interface to 3rd party systems via 'Critical' and 'Non-critical' volt-free alarms with onboard logs
Easy to interrogate 7.4" - 15" colour touch-screen displays all values and alarms on graphical status mimics
Tamper monitoring door status and activity log undercurrent alarms etc.