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EMB - Model Type 80 (CF 38) - Gas Relay for Transformer Monitoring
The gas relay from Elektromotoren und Gerätebau Barleben GmbH is designed for use with both open-type and hermetically sealed transformers, functioning as a monitoring device for oil loss and gas accumulations due to potential transformer faults. This particular model, Type 80 (CF 38), is optimal for hermetically sealed transformers without a nitrogen cushion, ensuring continuous oil level surveillance while equipped on the transformer tank. Additional options such as a pressure switch and a temperature sensor enhance its monitoring capabilities. The device's operation leverages the buoyant force of a float that, in normal usage, remains in the upper position when filled with oil. Gas build-up causes the float to descend, activating a switching contact which sends an alert signal. With a temperature range accommodating from -40 °C to +55 °C, the relay complies with DIN EN 60068-2-78 standards, making it suitable for various climatic conditions.
Due to its specific design, the gas relay is suitable especially for hermetically sealed transformers without nitrogen cushion. Mounted on the transformer tank it can be filled completely through an oil filler so that reliable monitoring of the oil level is ensured.
An integral pressure switch (optional) and a temperature sensor offer significant additional monitoring options for the transformer.
With open-type transformers with conservator the gas relay, on the one hand, serves as an air cell failure relay monitoring the hydro-type compensator (rubber sack) in the conservator and, on the other hand, the gas relay can also be used on the transformer cover.
During normal operation the gas relay must be filled completely with oil. Due to its boyant force the float is in the upper limit position.
As soon as gases are generated, these are collected in the gas relay and cause the float to descend. This actuates the switching contact (magnetic contact tube) and trips a signal.
Gas collection is indicated by the sightglass.