Retrofit to assess grid conditions
Project location
Trier, Germany
Year of implementation
2025
Application
Energy Monitoring Solution
Hardware
Level 1: UMG-512-PRO Level 2: UMG 96-PA and UMG 801 Level 3: UMG 806
Software
GridVis® Expert
Service
Consulting, commissioning
REQUIREMENT
Like many other energy suppliers, Stadtwerke Trier (SWT) is modernizing the measurement technology in its distribution grid for the energy transition. The existing measurement devices did not meet the requirements of Section 14a of the German Energy Industry Act (EnWG - Energiewirtschaftsgesetz) and had to be replaced. SWT needed a solution suitable for both new systems and retrofit projects. At the same time, the retrofit had to be as simple as possible during ongoing operation and require minimal space — a decisive factor in existing secondary substations. Also, all energy monitoring data had to be available both centrally and locally in the station.
SOLUTION
Stadtwerke Trier primarily used the expandable modular power analyzer UMG 801 in combination with the Remote Display RD 96 and the 800-CT8-LP current measuring modules. The new measurement technology records the transformer feeder, the PEN conductor, and all outgoing feeders with high-resolution, 4-phase measurement. The compact design played a key role, especially for modernizing existing systems. At just 18 mm, the compact modules require only one horizontal pitch (HP), yet provide connections for eight low-power current transformers. This technology also eliminates the need for current transformer disconnect terminals, which saves additional space and wiring effort. For larger stations or specific installation requirements, the modules can be installed anywhere in the station. The split-core transformers used made safe retrofitting possible during ongoing operation. The Remote Display RD 96 was also quick to install. Thanks to its standard 96 x 96 mm dimensions, it can replace older door-mounted devices without additional modifications. SWT wanted to retain full control over data transmission from the station. The open interfaces of the UMG devices met this requirement. Data retrieval does not require systembased encryption or proprietary software solutions.
BENEFIT
Measurements with the UMG 801 allow Stadtwerke Trier to assess power quality quickly and cost-effectively. Irregularities in the grid can be detected before they cause problems. This level of transparency is becoming increasingly important, especially when supplying commercial customers. The Remote Display RD 96 also stood out for its ease of use. Its clear, intuitive display helps even employees find the information they need quickly, even if they rarely work with the devices. This is especially important for the emergency service team, which must be able to navigate the station quickly as every minute counts. Beyond the initial assessment, the UMG 801 power analyzers also offer comprehensive functions for power quality analysis. In the future, SWT plans to use these capabilities for detailed analysis of individual grid areas.
