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Article Date: 13th June 2017

SHM Metering - Site Metering Prevents Power Outages & Work Stoppage

Power Outages - Work Stoppage - Embassy Gardens - Power Management

SHM - Embassy Gardens Construction Site

Embassy Gardens is a premier construction site in London being constructed by the Ballymore Property Group. Typically, large construction sites at the start of a new project are not connected to the main grid. A temporary electrical supply, in this case provided by Electro & Mechanical Systems UK, a company specialising in providing temporary supplies for building sites, is provided so that the site can commence operations. This development has a number of tower cranes, each one operating at up to 75kVA when lifting loads and, five hoists drawing up to 60kVA each. In the early stages of a building project the load is fairly low, but as more tower cranes are installed, the load can rise dramatically.

Managing Consumption to Avoid Tripping and Interruptions to works

EDF supplies the power from the HV network provided by UK Power Networks. The supply is drawn from a local HV substation from an MCB rated at 800Amps. If the current drawn rises above this figure the Air Circuit Breaker controlling the electricity supply will be tripped by a Schneider Micrologic 5 control unit in the HV substation. This has dramatic effects on the site machinery, cranes will stop and hoists will come to a halt. This is the last thing that is wanted on a busy and critical building operation. If all loads are switched on together Ballymore was anxious that the current could rise above the threshold level and cut supply to the site.

The Power Management System Solution

This is where SHM Metering’s special services have come into play. SHM has installed an Iskra MT382 meter with integral 3G mobile data communications on the incoming supply. The meter records two sets of consumption data, one at 5-minute intervals and the other at 1-minute intervals. The 1-minute data is downloaded over the mobile internet by the SHM Metering server every night after midnight and sent as an Excel file to the client. This gives the client his consumption pattern minute by minute throughout the day, and ties consumption peaks to the exact times of day when the load is high.

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