Danotherm Filter Resistors are convection-cooled, high-voltage steel grid resistors designed to prevent perturbations in power grids. The resistors comply with multiple national and international standards, including CIGRE WG 14.30, IEC 60071-1, IEC 60529, and EDF HN 64-S-50. The resistor grid elements are manufactured by punching and laser-cutting machines and are then assembled into resistor blocks. A mica-insulated steel rod connects the grid elements to the resistor blocks. The grids are welded together, and the blocks are mounted into cabinets. Galvanized steel is used for enclosures. Stainless steel and custom enclosures are available on request.
The choice of steel and alloy varies with application. Even though requirements vary, minor customization enables standard Danotherm steel grid resistors to be used for most applications.
Filter resistors range are available for 12 / 17.5 / 24 / 36 / 52 / 72.5 kV grid system voltages. Custom designs are available for applications with higher clearance/creepage/altitude requirements. Upon request, the following types of tests can be conducted:
Temperature rise test
Impulse voltage test
AC dielectric test
They are compact, reliable and robust, fitted for both indoor and outdoor use. The standard protection ratings range from IP00 to IP23, optional IP44 can be investigated. Filter resistors are used to attenuate harmonic frequencies in power grids. Typical applications include high-voltage DC networks, electric arc furnaces, and coupling of distribution networks.
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