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Monitoring system for transformer catch basins using IEC 61850

Overview

Transformer  

Transformer

  • When using devices operated with oil, the energy supplier must comply with special requirements for operating such systems.
  • Phoenix Contact offers a new system for continuous level monitoring, alarm generation, and pumping precipitation water for transformer catch basins.
  • The system cuts operating costs, as targeted and needs-based resource planning is possible.

Application

When using transformers, electrical coils, and other devices operated with oil (e.g., for insulation), for a volume of 1 m3 or more of water-polluting liquids, the energy supplier must comply with special requirements for operating such systems.

To prevent water-polluting liquids escaping from the overall system in the event of any incidents, all oil-filled devices must be set up on liquid-tight surfaces. These surfaces must be designed either as a catch basin or a drainage surface to an external collecting chamber or large-scale separator.

The Arbeitsgemeinschaft Industriebau (AGI), a German trade organization of industrial construction companies, has authored a technical standard that describes various structural options for designing transformer catch basins so as to comply with the German Ordinance on Installations for Handling Substances Hazardous to Water (VAwS). The technical standard also notes that the precipitation water can be pumped out of the basin or the collection chamber after a visual inspection. This is important because in the event of a catastrophic failure all of the oil from the transformer can be collected and does not pollute the environment.

Solution

Control cabinet solution from Phoenix Contact  

Control cabinet solution from Phoenix Contact

Phoenix Contact offers a new system for continuous level monitoring, alarm generation, and pumping precipitation water for transformer catch basins. The water level measured by an ultrasonic sensor is continuously compared to two different limit values.

A FO cable is used for communication from the control cabinet to the higher-level station control engineering using IEC 61850 so as to eliminate EMI influences in the transformer station. Thanks to this information, appropriate action can then be taken from the network control center.

During the subsequent inspection tour of the station by the maintenance personnel, the pumping process is started after a visual inspection of the precipitation water for oil contamination. The pumping process then proceeds automatically. During this process, the water level is still continuously measured and lowered to an adjustable minimum volume. An additional rod probe ensures that the pumping process is stopped immediately if any oil contamination is detected. The key components of the system are certified and have received official technical approval.

Functions of the monitoring system
The solution covers the following functions:

  • Level monitoring of the transformer catch basin
  • IEC 61850 messages to the network control center:
    • Alarm if limit values are exceeded
    • Eight freely programmable digital inputs for additional alarms
    • Pump control and management (start and termination of pumping)
    • Early termination of pumping due to the detection of oil
  • Modular extension possible for complete connection of the transformer to the control engineering using IEC 61850
Schematic layout of the level monitoring  

Schematic layout of the monitoring system

Configuration and diagnostics via web page
The monitoring unit is parameterized via the web server that is integrated in the small-scale controllers. A web interface is available for conveniently configuring the solution as well as displaying the diagnostic information. All that is needed to visualize the interface is a standard web browser (such as Microsoft Internet Explorer or similar) and JAVA Virtual Machine.

IEC 61850 – data modeling
The data model that is already integrated allows the monitoring system to be started up quickly using the control engineering by simply importing the .scd file into the control engineering. According to IEC 61850, the controller represents an Intelligent Electronic Device (IED). The IED contains an access point with a Logical Device (LD). Two standardized Logical Nodes (LNs) and three generic nodes (GGIOs) are defined in the LD.

There is no GOOSE (Generic Object Oriented Substation Events) communication in the monitoring system data model. Individual modification or extension of the data model can therefore be carried out easily. The time is synchronized via an SNTP server in the network. The corresponding address can be entered via the web interface.

Your advantages

  • The system cuts operating costs, as targeted and needs-based resource planning is possible
  • Easy integration into the station control engineering, thanks to IEC 61850 standardized data communication using .scd file
  • The system conforms to the relevant laws and regulations: German Federal Water Act (WHG), German Ordinance on Installations for Handling Substances Hazardous to Water (VAwS), and Arbeitsgemeinschaft Industriebau (AGI), a German trade organization of industrial construction companies
  • Easy installation, thanks to ready-to-connect system: control cabinet, sensor frame including the two sensors, and control cabinet frame

PHOENIX CONTACT Ltd

8240 Parkhill Drive
Milton, Ontario L9T 5V7
1-800-890-2820

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