Mounting structure for isolating switch in medium voltage switch cabinet

Abstract

The invention relates to an installation structure of an isolation switch in a medium voltage switch cabinet which comprises the isolation switch (20); the connection surface of the isolation switch (20) is parallel to the side surface of a cabinet body and an operating mechanism (21) of the isolation switch (20) is a rotary type; the invention has the beneficial effects that: the space of the medium voltage switch cabinet is effectively utilized; the isolation switch can be completely and normally arranged in the cabinet body and satisfactory application effect is obtained; furthermore, by adopting the method of lateral installation, the main connection of the isolation switch cabinet is kept in accordance with the main connection of a load switch cabinet, which is more suitable for the requirements of fabrication technology.

Description

technical field [0001] The invention relates to a medium-voltage switchgear (HXGN15-12 series), in particular to an installation structure of a disconnector in the medium-voltage switchgear. Background technique [0002] HXGN15-12 series medium voltage switchgear is mainly used for the ring network power supply or dual radiation power supply of the power system with three-phase AC 50HZ and rated voltage of 10KV. It can also be used for terminal power supply as the control of electric energy and the protection device of electric equipment. At the same time, because of its relatively small size, it is especially suitable for being installed in a compact box-type substation. [0003] The basic components of this type of switchgear are imported SFL and SFG type sulfur hexafluoride switches from ABB company. Due to the relatively high price of key components, the application level of this type of switchgear is limited to a certain extent during the promotion process; secondly, in...

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Problems solved by technology

[0003] The basic components of this type of switchgear adopt the imported SFL and SFG type sulfur hexafluoride switches of ABB company. Due to the relatively high price of key components, the application level of this type of switchgear is limited to a certain extent during the promotion process; secondly, in the scheme combination , the combination scheme based on the load switch is basically adopted, the combination scheme is not complete, and it brings unnecessary cost increase

[0004] It can be seen from Figure 1 that the working current of the voltage transformer in the G5-PT cabinet is very small, and the main circuit protection fuse is only 0.5 ampere. The standard scheme of the cabinet uses sulfur hexafluoride load switches, and the cost performance is unreasonable;

[0005] In the G3-main cabinet, VD4 type vacuum circuit breaker and SFG switch combination, both of which can break the load current and rated short-circuit current, appear repetitive in use

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