DC Auxiliary Distributions in Generating Stations
Going one step further, a hydro-generating company had facilities that needed an upgrade for its low voltage DC distribution systems. Thanks to the company's experience with Bender regarding exciter systems, they asked for Bender’s advice. The older technology did not permit this company to locate faults after ground faults occurred in their systems. They wanted to make the future DC switchgears smarter and to make life easier for their maintenance team. In many cases, the fault remained unresolved because the loads on the DC distributions are critical to maintain operation in the generating station, and therefore the "switch-off and check" approach on each feeder wouldn’t work.
The Bender team worked with the project consultant and system integrator to fit in the fault location system of iso685-x-P along with EDS440 fault locating monitor in a 250V auxiliary distribution. The same principle of insulation monitoring from the iso685 series allows for reliable detection of ground faults. Once that happens, the iso685-x-P monitor switches from IMD mode to EDS mode, in which a different signal is sent throughout the DC distribution. The EDS440 and its connected current transformers would pick up that signal only on the faulted feeder and associated CT. Up to 12 CT’s can be connected to a single EDS440 relay and in turn, the EDS440 will automatically determine which feeder has the detected ground fault. With this implementation of Bender ground fault detection and location technology, the hydro-generating company can help its maintenance team quickly locate ground faults. On-site commissioning and training have also contributed greatly to support this customer in familiarizing them with Bender technology.
Hydro-generation facilities need the best technology when it comes to electrical safety protection. This is why Bender has developed and maintained the best in class of insulation monitoring technology. Hydro-generation customers and their consultants were very pleased with Bender's IMD products that provided such an advanced level of protection for their exciter systems and DC auxiliary distributions.
For more information about this application or to learn more about Bender technology related to your specific application, contact our team of experts.
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