Switchgear structural features
Feb 19, 2021
The switchgeart structure is divided into two parts: the instrument box and the cabinet body according to its composition. Except for the instrument box which is formed by bending and welding of thin steel plate, the other parts are welded and formed by angle steel. Thin steel plate is applied to strengthen the rigidity of the cabinet frame and improve the external quality. According to the functional characteristics, it can be divided into four parts: the representative box, the handcart room, the cable room and the busbar room. Each part is separated by a grounded metal partition, and the enclosure protection level is IP2X.
The circuit breaker handcart is equipped with SF6-35 circuit breaker. In addition, it is also designed with isolation handcart, voltage transformer handcart, lightning arrester handcart, and transformer handcart.
The handcart is equipped with a light push-pull mechanism, a flexible and reliable positioning mechanism and an accurate guiding device. A reliable mechanism interlocking device is provided between the positioning mechanism and the secondary plug (the secondary plug cannot be pulled out when the working position outside the handcart is ensured).
Reliable mechanism interlocking devices are provided between the circuit breaker and the primary isolation contact, the grounding switch, the handcart and the rear door of the rear cabinet.
The working status of the circuit breaker can be seen through the handcart panel, that is, the observation window on the cabinet door, whether the primary isolation contact and the associated lock mechanism are working properly; the bus bar and grounding switch can be observed through the observation windows on the upper and lower doors of the cabinet Working status.
There are pressure relief valves on the top of the handcart room and cable room to release abnormal pressure and steam in the cabinet.
The main bus can be installed in the upper part of the rear of the cabinet according to user requirements, or in the lower part, and can enter and exit from the top of the cabinet overhead, and can also enter and exit from the cable under the cabinet.
