case study-lv system automation.pdf
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case study-lv system automationTRANSCRIPT
A division of W Lucy & Co Ltd
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Automation Case Study – Abu Dhabi Distribution Company, UAE
ADDC Forges Ahead with Distribution Automation ProgrammeAbu Dhabi Distribution Company (ADDC) has serious ambitions for the widespread
implementation of Distribution Automation across its operating area to enhance the service
to its customers. The Distribution Automation (DA) strategy is to apply automation capability
across the 11kV underground network in the urban conurbations and typically in the
11kV/ LV substations.
Lucy Switchgear has been a key supplier of MV ring main equipment over many years to
ADDC and a considerable proportion of the network is populated with our ring main units.
ADDC approached a number of RTU manufacturers for suitable solutions with the proviso
that a turnkey package should be offered in terms of retrofitting automation capability
to the existing 11kV network.
Wi-Mesh, a wireless internet infrastructure, is being installed extensively throughout
Abu Dhabi city and the emirate has been chosen by ADDC as their preferred method of
communication. The existing Distribution Management System’s (DMS) inherent scalability
is being utilised to ‘SCADA connect’ the 11kV/ LV automated substations into this system
once commissioned.
The Lucy Switchgear Solution
There are typically two main configurations for the type of ring main units normally
purchased by ADDC, namely the TRM and QRM being a 2+1 (ring switches and circuit
breaker) and 2+2 respectively. These configurations are satisfied with the SABRE VRN2a
(non-extensible RMU) and the SABRE VRE2a+VCE2a (extensible ring main unit and circuit
breaker). To reduce the necessity for two types of RTU, a single Remote Terminal Unit (RTU)
format was designed to cater for the QRM and, by definition, the TRM. ADDC has therefore
benefited from reduced stocking issues.
The automated ring main units were equipped to include:
• Motorised actuation for the incoming ring switches (Open and Close operations)
• Shunt tripping for the transformer CB
• Protection relay alarms
• Transformer loading
• Earth fault detection
• Low gas pressure monitoring
A division of W Lucy & Co Ltd
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The Automation division within Lucy Switchgear liaised with ADDC to ensure that
interoperability was achieved with their existing DMS/ SCADA in terms of database and
communication configuration and protocol. The IEC 60870-5-104 protocol was configured
to a ‘report by exception mode’ to reduce communication overhead with a ‘health
ping’ to each RTU every ten minutes.
In order to protect ADDC’s original investment in Lucy Switchgear ring main units, Lucy
Switchgear offered a service whereby existing Lucy ring main units can be recovered
from the network and refurbished at our manufacturing facilities in Dubai and equipped
with suitable automation facilities. The refurnished units can subsequently be returned
to the 11kV network as fully automated ring main units with the necessary Gemini-RTU
2, communication device and cabling. On-site installation times were minimised by
plug-in connections between components and pre-RTU configuration.
Implementation
ADDC’s contractors received full training on all aspects of installation and commissioning
of the automated ring main units and feedback on the ease of installation has been
very positive.
Installation works have continued at a pace and it is expected that over 150 substations
will have been upgraded to automation by the end of 2010 - a considerable achievement
given the original timescales.
What does the future hold?
ADDC is looking to progress this work into its sister company, Al Ain Distribution
Company, and a similar project approach is being adopted for this phase of the DA
roll-out. For the time being, ADDC will use another IP based communication system in
GPRS with a potential to revert to Wi-Mesh once the network has been established.
Fibre optic links are also deemed to be another potential communication media.
It is clear that this substantial investment in DA will bring enormous benefits to ADDC’s
customers in terms of supply security and availability and provide ADDC with real time
data that can be archived for future network planning purposes. Having visibility and
control of the 11kV network will also increase network operational flexibility, deferment
of reinforcement investment, reduced manpower and transportation costs.
The future for ADDC’s customers is certainly looking brighter.
Lucy Switchgear
Howland Road, Thame,Oxfordshire, OX9 3UJ, UK
tel: +44 (0)1844 267267fax: +44 (0)1844 267223
email: [email protected]
Lucy Middle East
PO Box 17335, Jebel Ali,Dubai, United Arab Emirates
tel: +9714 812 9999fax: +9714 812 9900
email: [email protected]
The Saudi Lucy Company Ltd
PO Box 834, Al-Khobar,31952, Saudi Arabia
tel: +966 3 8823057fax:+ 966 3 8822553
email: [email protected]
Lucy South Africa
Suite 22, Fourways Business Centre,Design Quarter, Nicole GroveOffice Park, Leslie Road, Fourways2005, South Africa
tel: +27 (0)11 5133415tel: +27 (0)11 5133000fax: +27 (0)86 6783418
email: [email protected] Asia Pacific Sdn Bhd
Suite 32-01-92, 32nd Floor, Wisma KeckSeng, 203 Jalan Bukit Bintang, 55100Kuala Lumpur, Malaysia
tel: +603 2116 5640fax: +603 2116 5647
email: [email protected]