A low-loss high-impedance power transformer

Abstract

The invention discloses a low-loss high-impedance power transformer, which comprises a box body, a low-voltage terminal, a high-voltage terminal, a liquid level gauge, an oil conservator, and a cooling box. The upper end is equipped with low-voltage terminals, high-voltage terminals, and a liquid level gauge. The oil conservator is fixed on the box body through supporting feet. The liquid level gauge cooperates with the oil conservator. The inner cavity is designed as a double-layer structure, so that the capsule can avoid direct contact with the inner surface wall of the oil pillow, which plays a certain role of isolation, and can prevent the surface temperature of the oil pillow from directly acting on the capsule, and the temperature sensor is completely installed on the oil pillow. The inner wall of the pillow enables it to sense the external temperature. When the temperature is lower than the set value, the heating strip covering the inner cavity is activated. Therefore, when the temperature is low in winter, the heating plate is covered in a ring to ensure that the inner cavity The surface of the capsule will not freeze due to low temperature.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a low-loss high-impedance power transformer. Background technique [0002] With the rapid expansion of the grid scale, the short-circuit capacity increases sharply, resulting in the situation that the short-circuit current level exceeds the breaking capacity of the circuit breaker. Characterized by the percentage of short-circuit voltage) is larger, which is equivalent to increasing the positive sequence impedance of the system, thereby limiting the short-circuit current. [0003] In view of the good capacity adaptability, low installation requirements and strong overload capacity of oil-immersed transformers, they are widely used, and transformer oil is responsible for insulation and cooling, and direct contact with air is not allowed during operation. Transformer oil and other components have expansion and contraction due to changes in load and ambient temperature. In order to ensu...

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Problems solved by technology

[0002] With the rapid expansion of the grid scale, the short-circuit capacity increases sharply, resulting in the situation that the short-circuit current level exceeds the breaking capacity of the circuit breaker. Characterized by the percentage of short-circuit voltage) is greater, which is equivalent to increasing the positive sequence impedance of the system, thereby limiting the short-circuit current

[0003] In view of the good capacity adaptability, low installation requirements and strong overload capacity of oil-immersed transformers, they are widely used, and transformer oil is responsible for insulation and cooling, and direct contact with air is not allowed during operation. Transformer oil and other components have expansion and contraction due to changes in load and ambient temperature. In order to ensure normal expansion and contraction and avoid direct contact between the oil and the outside world, the oil pillow capsule is one of the sharp tools. In rainy weather, especially in winter, the surface of the capsule is easy to freeze, and the softness of the surface decreases, causing the water content to increase and at the same time, it is easy to age and crack, and it is easy to be damaged during oil filling, so that moisture can easily enter the oil

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