Control sensor for devices filled with dielectric liquid, especially transformers

摘要

The control sensor is equipped with a metal sleeve (4) that can slide in relation to the sleeve (1) loosely connected to the pressure control module (2) preferably being an elastic bellows equipped with a mandrel (9) placed in the opening (5) in the metal sleeve (4). Inside the sleeve (1) there are contacts (6), which cooperating with the metal sleeve (4) or with a float (7), constitute a common output for the electric signal. The contacts (6) are introduced in the electric circuit of the transformer (T). The electric signal originating from the control sensor is a signal of liquid pressure control or liquid level control, causing start of the disconnector (R). The sensor described in the invention combines the function of oil pressure and oil level control and is connected with the circuit of electric overcharge control realizing the integrated system of transformer's operation protection.