Embedded technologies

For the APG casting of instrument transformers in particular, Vogel can supply SF6 handling systems that are connected directly to the APG mould. After evacuation of the mould, the active part inside, including the interior vacuum chamber, is flooded with SF6, prior to the injection of the resin. The SF6 improves partial discharge levels. For certain types of instrument transformers drastic improvement of properties is thus achieved. SF6 handling  systems are designed to operate fully automatically, without any operator intervention. After the process, the SF6 can be re-claimed back into the supply unit, so that a minimum of exposure of SF6 to the atmosphere is achieved.

Vogel is well-equipped with two clamping-machines, three Epoxy/PUR dosing-systems and two silicon dosing-systems in a pilot plant station, especially established for customer service. Here we can perform casting trials for our customers, or develop a process or a final product. In addition, lab-tools are available, like TG-measurement, viscosimeters, etc. to determine the final properties of the cured resin. For the casting of coils, cutting-devices, as well as microscopes are available, too, to determine the impregnation-degree of the winding.

Vogel uses the hardware and software capabilities of the whole Hedrich Group to programme clamping machines and dosing units. “Hedrich Software and Automation” is a rapidly growing sub-division of Hedrich’s that employs more than 20 software engineers for designing the software according to customers’ requirements. All controllers available from Siemens, Allen Bradley etc. can be used according to customers needs. Simple PLC-controls, up to the most modern soft PLC-emulation on a PC-basis including TFT-monitor and Windows-based graphic controls can be programmed. With these tools, we achieve a safe operation of the clamping machines and dosing units, while we provide an environment for storing all process-relevant data according to DIN/ ISO requirements at the same time.