Innovative Power Monitoring Devices

Enhanced energy management and power monitoring using sophisticated, contemporary yet, futuristic and highly evolved and reliable Diris Digiware range of plug & play devices from Socomec…

The DIRIS Digiware is a measuring system (PMD*) with modular format. It is designed for monitoring and reporting electrical energy. The DIRIS Digiware offers a range of functions for measuring voltage, current, power, energy and quality. It can be used to jointly analyse the single-phase and three-phase loads. It is an innovative concept based on centralising the voltage measurement and distributing the current measurement close to the loads. The voltage is measured by a dedicated DIRIS Digiware U module and the current by dedicated DIRIS Digiware I modules. The voltage and current measurements are interconnected by the DIRIS Digiware Bus. On the Digiware I modules, three or four current inputs are available, depending on the model, enabling one or several loads to be monitored simultaneously. Several modules may be connected to the Digiware bus. This approach offers the possibility of characterising a high number of loads from a single voltage tap.

  Cabling is made simple by a single voltage measurement connection. The connection mode for the current sensors also contributes to quick, easy installation and the automatic identification of the sensor (type and rating) significantly reduces the risk of installation errors. In addition, combining the current sensor with the DIRIS Digiware means the overall accuracy of the DIRIS Digiware + Current sensor measurement chain can be guaranteed for all values measured.

  The DIRIS Digiware is configured from its remote display or via the Easy Config software. The measurements can be accessed via the WEBVIEW web server integrating the monitoring function for electrical values (Power Monitoring version) and reporting function for energy data (Power & Energy Monitoring version). WEBVIEW is available on the DIRIS G communication gateways. Due to its intrinsic architecture, the DIRIS Digiware can be easily integrated into an energy management system which requires a large number of loads to be monitored.

  The DIRIS Digiware boasts numerous functions, including:

• General measurements
– Voltage measurement
– Multi-load current measurement
– Power, power factor, phi, cos phi and tan phi
– Operation across 4 quadrants
– Predictive power
– Guarantees the overall accuracy of the DIRIS Digiware + Sensor measurement chain in terms of power and active energy up to class 0.5, as per IEC standard 61557-12
• Quality
– Direct, inverse and homopolar voltages
– THD and harmonics up to order 63 for voltage and current
– Current and voltage unbalance
– EN50160 events (Uswl, Udip, Uint) and current overloads
• Logging 
– Recording of average electrical values
– Recording and time stamping of min/max electrical values
• Metering
– Partial and total apparent, active and reactive energies
– Load curves
• Alarm
– Time stamped alarms with boolean combination
• Current inputs
– Measurement of 3 or 4 currents per current measurement module
– Current inputs with quick connection and automatic recognition of the current sensors
– Simultaneous management of several single-phase, two-phase and three-phase loads
– Connection of solid-core, split-core and flexible sensors
– Checking of the connection, detection of the CT and auto-configuration of the networks
– Guarantees the overall accuracy of the DIRIS Digiware + Sensor measurement chain at Class 0.5 in terms of power and active energy as per IEC standard 61557-12 
• Communication 
– RS485 communication
– Association with the DIRIS Digiware D-50 multi-product remote display
– Measurements available in the WEBVIEW web server of the DIRIS G gateway
– Time synchronisation by the DIRIS G gateway
– Auto-addressing in association with the gateway or the remote display.

  At the core of an organization’s energy efficiency related efforts is to aim for ISO 50001 standard compliance, being the international standard for energy management the strategy is to allow a company to –
– Develop, supply and uphold an energy policy 
– Establish objectives, targets and action plans

Global standard for Energy management, ISO 50001, 2011

  The ISO 50001 standard integrates energy management into the company’s daily practices. It is based on the same dynamic continual improvement as other system management standards, such as ISO 9001 (quality management) and ISO 14001 (environmental management), which makes it easier to implement in the company. It is based on the principle of continuous improvement PDCA (Plan-Do-Check-Act).

Challenge to maintain System accuracy under varying load conditions

New approach of DIRIS Digiware ranges

  For energy efficiency projects, we need to measure a number of loads on an installation to be able to assess its behaviour.

  To this end, Socomec has developed a comprehensive solution called DIRIS Digiware, comprising a multi-point measurement system with a range of associated current sensors.

  The DIRIS Digiware measurement system consists of interconnected modules:

– A DIRIS Digiware U module dedicated to measuring voltage,
– DIRIS Digiware I modules dedicated to measuring current.

  Several types of modules are available depending on the number of loads to measure. Data from voltage measurement U is transmitted digitally to the current measurement I modules to calculate power and energy.

  The current sensors use a specific connection type RJ12, allowing:

– A fast connection without wiring errors,
– Detection of current sensors,
– The guarantee of a 0.5 % overall accuracy in the power and energy measurement chain.

  Example of a connection between the DIRIS Digiware I-30 with its assigned TE current sensors:

Classification of the DIRIS Digiware solution according to the standard IEC 61557-12

  With this approach we can classify the DIRIS Digiware solution and its current sensors in the direct connection PMDs (PMD DD) section according to the standard IEC 61557-12. For a PMD of a C < 1 accuracy class and taking into account Ib = In and Imax = 120 % In, the table of IEC 61557-12 (Section 3) is shown in table above.

Comparision between a “standard” PMD+CT product and the DIRIS Digiware solution

• “Standard” product: Class 0.5 measuring device (PMD) assigned to class 0.5 current transformers (CT) → Class 1 calculated (See above table).
• Digiware solution using TE current sensors → Class 0.5 guaranteed.

  On account of its class leading innovative technology, DIRIS Digiware can guarantee 0.5 overall performance class accuracy in power and energy for loading between 2 to 120% of nominal ratings. By comparison, with a 0.5-class measurement device assigned to 0.5-class current transformers, one will only reach an overall performance class of 1.

  Thus, the measuring range and performances offered by DIRIS Digiware surpasses the PMD+CT conventional solutions offered on the market that is definitely a key criteria towards ISO-50001 accredited systems and facilities.

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