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Energy Management


Reduced production costs


Fig. 2. COPA-DATA offers an energy supply management tool for small and middle supply companies and for industrial firms whose energy supply is arranged by special contracts.


in trend screens, he can monitor how the plant works and the numbers develop. Te data is provided by international communication protocols such as DNP3, IEC 60870 or IEC 61850. Tese protocols offer a time stamp on each data point value. With this time stamp it is possible to follow all actions chronologically in order to analyse what happened and in what sequence. In order to keep track of all unusual or critical


processes and data flows in unmanned stations, some energy automation systems also offer automated notification systems. Tis means that, in case of an alarm or critical condition, a message (eg, SMS, e-mail or voice mail) is automatically sent from the SCADA system to the operator. Te feature guarantees that the right people are informed about anomalies in the plant immediately and, thus, a quick reaction is possible.


As a rule, supply contracts work on the basis of predetermined energy consumption levels. If the agreed levels are exceeded, the charge for additional consumption is significantly greater. In order to optimise the economic management of power supply for businesses, especially industrial firms, the implementation of an energy management system is highly recommended. Te most important function delivered by such a system is an energy trend calculation which serves as the basis for an automated energy supply optimisation. An effective energy management system enables the largest possible amount of energy to be procured from the supplier at the lowest possible prize. Most significantly, it is the avoidance of costly power peaks that is the key to these savings. Tere are a number of targeted control actions to avoid such peaks: the loading can be reduced by switching off loads; on-site energy generation can be introduced or increased; or energy can be brought in from other sources. To this end, the average power used within a measuring period must be predicted using the most accurate forecasting tool available. In this way, if the defined limit for imported power is at risk of being exceeded, the problem can be recognised in minimal time and the appropriate action can be taken. Te European automation expert COPA-DATA


offers premium technological solutions for meeting the increasing demands of innovation and functionality in the energy industry. Te SCADA system zenon, available as zenon Energy Edition with customised Energy features the core system for IEDs, straton, as soft PLC, and the zenon module Energy Management System (EMS). ●


Enter 15 or ✔ at www.engineerlive.com/ies Jürgen Resch is Industry Manager Energy, COPA-DATA, Salzburg, Austria. www.copadata.com


Meeting the 61850 challenge


challenge – how can IEC 61850 protection schemes be tested? Conventional protection relay test sets work with binary (on/off) inputs and outputs, not GOOSE messages on an IEC 61850 network.


I


EC 61850 networking technology is slowly making its way into electricity substations and is bringing with it a


Test sets with IEC 61850 functionality


are available, but they are costly and their purchase may be hard to justify, especially if only a few IEC 61850 devices are to be tested. Fortunately, there is an alternative –


Megger’s Goose Message Interface (GMI), which converts GOOSE messages to binary inputs and outputs. The GMI has


several binary outputs, each of which users can map


to a specific GOOSE message. When that message appears on the network, the


associated GMI output operates. Likewise the GMI has binary inputs that can be assigned GOOSE messages. When a signal is received at an input, the GMI sends the appropriate GOOSE message. With the GMI, any relay test set can be


adapted for testing IEC 61850 protection schemes. This means that a smaller investment is required than would be needed to purchase a new test set, and that protection engineers can continue to use equipment with which they are familiar. ●


Enter 15A or ✔ at www.engineerlive.com/ies


Megger Limited is based in Dover, Kent, UK. www.megger.com


www.engineerlive.com 15


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