Transformer temperature controller with external heating elements

Abstract

The invention discloses a transformer temperature controller with external heating elements, which comprises a sensing guide tube (1) and a copper body (2) connected with the sensing guide tube (1), wherein, the other end of the copper body (2) is provided with a push rod (3); heating tubes (4) are connected on the sensing guide tube (1) in series; and electric heating elements (5) are arranged on the heating tubes (4). In the invention, a temperature-sensing medium is heated outside the copper body to avoid a local overheating atmosphere of the copper body and maintain consistent rigidity and hardness of the push rod under different load conditions, and displacement of the push rod is only related to swelling capacity of the temperature-sensing medium, thus guaranteeing high precision ofthe temperature controller. The transformer temperature controller has simple structure but solves the technical problem which is always expected to be solved but is not successful.

Description

Technical field: [0001] The invention relates to a transformer temperature controller, in particular to a transformer temperature controller with simple structure and high precision with an external heating element. Background technique: [0002] The transformer temperature controller needs to detect the transformer winding and oil surface temperature. The main structure of the transformer winding thermostat is a converter connected to the transformer current transformer. The output of the converter is connected to the electric heating element (resistance wire) built in the copper body, and the upper end of the copper body is provided with a push rod. , the other end is connected to the sensing conduit (capillary) placed in the temperature sensing package, and the sealed system composed of the temperature sensing package, sensing conduit and copper body is filled with temperature sensing medium. The temperature sensed by the temperature-sensing package and the heating eleme...

AI Technical Summary

Problems solved by technology

Since the existing electric heating elements are all placed inside the copper body, the heat dissipated overheats the inside of the copper body, resulting in changes in the stiffness and hardness of the push rod, which in turn affects the displacement of the push rod, and this change varies with the current passing through the electric heating element. And change, difficult to compensate, directly affect the accuracy of detection

The low accuracy of the transformer thermostat has become a technical problem that people have been eager to solve but have not been successful

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