Miniaturized switch cabinet of handcart type

Abstract

The invention discloses a miniaturized switch cabinet of a handcart type, and relates to a switch cabinet. The miniaturized switch cabinet is characterized in that a left tongue plate fixing plate and a right tongue plate fixing plate are respectively mounted on a left side plate and a right side plate; a wall penetrating bushing is mounted above the right side plate, and a main busbar penetrates through the wall penetrating bushing; an upper contact box and an insulating cover are respectively mounted at the upper part and the lower part of a contact box mounting plate, the upper contact box is connected with the main busbar through a copper bar, and the insulating cover is connected with the upper end of a lower end busbar through screws; a current transformer is arranged in the middle of the lower end busbar in a penetrating manner, and the lower end of the lower end busbar is fixed on an earthing switch; the current transformer is fixed at the right part of a breaker base plate, and the earthing switch is fixed on the left side plate; the lower part of a conducting loop of the earthing switch is connected with an over-voltage protector. The miniaturized switch cabinet disclosed by the invention has a high level of protection. Through the adoption of a handcart type vacuum breaker in a side mounting manner, the width is small, the cost is reduced, the requirement that power distribution equipment is miniaturized is met, and the operation is safer and more reliable through an operation interlocking function.

Description

technical field [0001] The invention relates to a switch cabinet, in particular to a miniaturized handcart type switch cabinet. Background technique [0002] Existing switch cabinets have problems such as bulky size, complex structure, low protection level, complicated and unreliable operation interlocking, etc. Existing handcart switch cabinets generally adopt mid-mounted installation, such as KYN28 mid-mounted switch cabinet, which uses high-voltage The three-phase main circuit of the circuit breaker is arranged horizontally, and the circuit breaker can be pushed forward through the operation of the chassis car at the bottom of the circuit breaker. The horizontal layout of the main circuit of the phase leads to a large cabinet width, and the forward and backward movement of the handcart requires a certain stroke, resulting in a deep cabinet, so it occupies a large area; in addition, the upper and lower pairs of contact boxes are located in the middle of the switch cabinet...

AI Technical Summary

Problems solved by technology

[0002] Existing switch cabinets have problems such as bulky size, complex structure, low protection level, complicated and unreliable operation interlocking, etc. Existing handcart switch cabinets generally adopt mid-mounted installation, such as KYN28 mid-mounted switch cabinet, which uses high-voltage The three-phase main circuit of the circuit breaker is arranged horizontally, and the circuit breaker can be pushed forward through the operation of the chassis car at the bottom of the circuit breaker. The horizontal layout of the main circuit of the phase leads to a large cabinet width, and the forward and backward movement of the handcart requires a certain stroke, resulting in a deep cabinet, so it occupies a large area; in addition, the upper and lower pairs of contact boxes are located in the middle of the switch cabinet, next to the At the same time, the distance between the conductive parts of the upper and lower contact boxes is small, and the insulation level is low. For example, the patent announcement number 203536842U discloses a miniaturized structure of a KYN28 central switchgear. Although the above problems have been optimized, its structure has not changed. Huge, incomplete interlocking and high cost; another example is a KYN switchgear disclosed in patent announcement No. 202454952U, which also has defects such as large volume, wide width, large floor area, complex structure, and high cost.

[0003] The existing side-mounted handcart-type switchgear uses a worm gear mechanism to rotate the circuit breaker to move the circuit breaker upwards. The contact box at the lower end of the primary circuit is installed sideways. The installation and fixation are unreliable, the insulation distance is small, the volume is large and the structure is complicated, such as patent publication No. 101320891 A side-mounted and removable high-voltage switchgear is announced. Its worm gear mechanism needs to be positioned and installed with the switchgear, and the movement process swings greatly, requiring guide rails to limit the position. The structure is complicated and unreliable. The worm gear mechanism is pulled out from the switchgear. It is very inconvenient to install and debug. The contact box at the lower end of the primary circuit is installed sideways and needs to be fixed from the rear. The front part is seriously affected by gravity and contact thrust, and the structure is unstable. There is no reliable fixing device between the circuit breaker and the switch cabinet, which causes serious shaking during the movement of the circuit breaker, making the contact plugging of the primary circuit unreliable. The cabinet width is affected by the contact box and the lifting mechanism. Seriously affecting the miniaturization requirements of power distribution equipment

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