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Insulation monitoring for DC charging stations

Bender has launched a new combined insulation monitor for DC fast charging stations.

Until recently two devices were required for insulation monitoring in DC fast charging stations. The combined device isoCHA425HV+AGH420-1 supports the two common charging standards (CCS and CHAdeMO).

A galvanically isolated Modbus RTU interface is available for communication with the device. Customer-specific parameters are preset for the respective standard. Changes to the settings can be accomplished via a pushbutton and menu structure on the device or via the Modbus protocol. The device is designed for voltages of up to 1000V, thus already taking ever increasing battery voltages into account.

In addition to monitoring the insulation level, the device is also capable of measuring the nominal voltage during charging and will alarm if the voltage exceeds or drops below self-defined limit values. Furthermore, the system leakage capacitance of the charging station and the vehicle is monitored. If insulation faults occur, the fault location is displayed (DC+/DC-/symmetrical). This helps the service technician to assess the status of the charging station and facilitates fault location.

Benefits:

  • Fewer devices
  • Easier to install

Features:

  • Fast trip on asymmetric faults ≤ 1 second
  • Trip on symmetrical faults
  • Voltage measurements up to 1,000 V
  • Modbus RTU communication

This is a major benefit compared to conventional insulation monitoring devices for DC charging stations. According to CHAdeMO, typical IMIs only monitor single-pole faults and do not detect symmetrical faults. Environmental factors can lead to ageing of the charging cables, which generally results in a consistent drop in the insulation level, so that, in the event of symmetrical faults, there is no tripping, even though the insulation level has dropped. The Bender IMIs features make it possible to increase the protection level in CHAdeMO mode which leads to an increase in safety for users and equipment.

Product page: https://bit.ly/3kC9ekY

Monitor article: https://bit.ly/3kEgYmlM

Bender UK is a subsidiary of Bender GmbH – a global, independent company established in the 1940s by Walter Bender. The family owned company has 80 offices worldwide, with headquarters and state of the art production facilities in Grunberg, Germany.

Bender is involved in the innovative design and manufacture of quality electrical safety solutions, serving a range of market sectors delivering solutions which identify electrical faults before they become critical. Key markets include defence, oil, gas and mining, manufacturing, data centres, electric vehicles, rail and healthcare.

Cumbrian based Bender UK is responsible for sales, project management, installation and through-life technical support of Bender products in the UK and Ireland.  The Bender UK team work with leading OEMs, consultants, engineers and end-users to deliver solutions which monitor, forewarn and locate developing insulation failure in complex electrical systems.

Bender UK works in key market sectors, to prevent loss of power and shut-down:

Industrial: Residual current monitoring and power quality management devices monitor electrical networks, plant, and buildings to ensure that they are electrically safe. Bender systems provide a continuous health check on electrical systems delivering far-reaching and cost-effective benefits by predicting when and where issues will occur, tracking power usage to identify potential energy savings.

E-Mobility: Bender is a world leader in the application of safety solutions for charge stations and operating systems for hybrid and electric vehicles.  Collaborating with major manufacturers on passenger, transport and commercial vehicle projects, Bender supplies compliant charge station technologies and insulation monitoring for new generation vehicles.

Rail: An approved supplier to Network Rail, Bender UK technology monitors and protects trackside power supplies and signal systems across the UK, identifying and locating electrical faults, anticipating failure to enable predictive and preventive maintenance, keeping rail networks moving.

Oil, Gas and subsea: Effective management of offshore, on-shore and oil and gas infrastructure is facilitated by Bender line insulation monitoring equipment to prevent downtime and loss of production. Bender also collaborates with OEMs on bespoke offshore and sub-sea applications, utilising certified engineers to conduct fault finding analysis, health surveys and commissioning.

Defence: Complex systems on board Royal Navy surface ships and Astute-class submarines are protected by Bender technology to identify and locate earth faults and help prevent electrical failure.

Healthcare: In the UK and Ireland, Bender is market leader in turnkey healthcare solutions, delivering critical care power systems to protect staff and patients from loss of power in hospitals.   Bender also supplies clinical equipment including high performance Merivaara LED surgical lighting and operating tables, infection-reducing touch screen control panels, and clinical services pendants, backed up by 24/7 service, call-out and technical support support to over 400 hospitals.

From off-the-shelf products, to highly customised systems Bender is a supplier of choice to deliver world-class services for critical infrastructure applications.

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