In 1950 Outdoor Type Current-and Voltage Transformers up to 220 kV became available on a small scale from the RITZ catalogue. 1951 resulted in the first deliveries of the rated insulation voltage of 110 kV.
Combined Instrument Transformers with a Current Transformer winding system in support head design with a cast base assembly and it is hermetically sealed air tight (consisting of a metallic boot) and in case needed with secondary flexible connectors for different primarily rated currents.
sent RITZ nine 380 kV Current Transformers with capacitive voltage transformer part for the Royal Waterfall Company to North Sweden for the first high voltage network in the world with 380 kV.
Three units of a 380-kV-Combined Transformer (with capacitive voltage transformer parts) were delivered to the RWE (Rheinisch Westfälisches Elektrizitätswerk).
Bushing-type Current Transformers for 60 kV and 110 kV for building-bushing type from indoor to outdoor.
1960 – 1969
The input to further development for transformers up to 220 kV
In the 1970’s the basic modification to the constructive assembly for all High Voltage Transformers from 60 kV to 800 kV
Beginning of the 1980’s changed the nature in which the seal was made air tight. Instead of the previous boot a container with rippled areas was used.
Its advantage was not just in its cost effectiveness but also in its larger robustness.
The volume difference of a can amounts to 5 l corresponding with an expansion of 63 l oil in 100° C warming.
The constructive features of the last series enabled Current and Voltage Transformers up to 800 kV.
RITZ Outdoor High Voltage Transformers up to 800 kV took in the top position with regard to security, maintenance free and service life worldwide.
Gas-insulated Voltage Transformers were encapsulated and flange-mounted.
They need practically no additional space.
The isolation drawings are, like with GIS, inside of the grounded housing.
Gas Insulated Outdoor Transformers are used if the use of devices with oil contents is to be avoided extensively; for example in drinking water or environmentally sensitive areas according to legal restraints.