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NVV AG – Multi-Utilty System for Electricity, Gas and Wastewater
NVV Niederrheinische Versorgung und Verkehr Aktiengesellschaft in Mönchengladbach/West Germany, supplies approximately 350,000 inhabitants in the city of Mönchengladbach and ist surroundings with electricity, gas and water. A multi-utility SCADA system is used for the central monitoring and control of the power grid (3,650 km), the natural gas network (1,150 km), the drinking water network (950) and the sewer network (1,300 km).
The power, gas, drinking water and wastewater networks are controlled via the IDS HIGH-LEIT control system. Apart from SCADA functions and a topology module, the system also features a simulation module which enables the simulation of switching operations and their impact on the power grid.
Separate grid calculations can be executed via an independent application server, including the calculation of load flow, short-circuit current, compensation current and distance protection for the power grid.
Calculation of Protection Settings
For the fulfilment of further network protection requirements, NVV uses the data model in the IDS HIGH-LEIT Master computer. For this purpose, important setting parameters of the protection equipment installed in the grid are additionally stored in the Master computer.
Based on these line protection data, the Master computer is able to calculate the compensation currents, both in the current data model or in simulated network states; these compensation currents can be compared with the preset values of the shunt reactors. The results are visualised and provide reliable information at an early stage as to whether it is advisable to make new settings in the event of network changes or new modes operation within the network.
The control system can also be used to determine the setting values of the distance protection devices on the basis of the available data and through adaptation to preferential switching situations. For this purpose, the user defines the desired selective points and breakover points (with grading times and reduction factors), on which basis the control system creates lists featuring the recommended setting parameters.
Advanced Application Functions for Gas and Water
For the gas supply network, gas forecast and gas demand optimisation modules are available.
The economical operation of installations in the water system is facilitated through functions for reservoir management and leakage monitoring, and for demand forecast.