Plug type current transformer

Abstract

The invention discloses a plug type current transformer overcoming the problem that the environment is influenced because the system power failure time is relatively long and a gas filled compartment is needed to be opened for carrying out gas operation when the current transformer is replaced in the prior art. The plug type current transformer is characterized in that a rectangular pouring body, two cylindrical pouring bodies and two conical pouring bodies form an epoxy resin transformer pouring body, wherein a grounded aluminum housing is arranged at the outer surface of the rectangular pouring body, fixed flanges are arranged outside the cylindrical pouring bodies, silicon rubber sleeves are arranged outside the conical pouring bodies, ground potential shielding layers are formed by spraying a conductive adhesive on a contact part of the silicon rubber sleeves and silicon rubber sleeve support rings, and the lower end of a primary copper conductor is fixedly connected with a conducive contact through a screw. The plug type current transformer has the beneficial effects that the plug type current transformer is directly plugged in an inner conical sleeve of a gas-insulated metal-enclosed switchgear to form a plug type connecting structure when being used, the system power failure time is short when the plug type current transformer is replaced, the gas operation is not involved, the safety, energy saving and environment friendliness are achieved, the disassembly, assembly and replacement speeds are high, and the housing can be touched.

Description

technical field [0001] The invention belongs to the technical field of current transformers, in particular to a plug-in current transformer for 72.5kV gas-insulated metal-enclosed switchgear. Background technique [0002] In the prior art, there are two types of current transformers used in gas-insulated metal-enclosed switchgear (C-GIS for short), one is directly connected to the primary cable, and the other is installed in the gas-filled barrier of C-GIS. room interior. The above two current transformers each have their own advantages and disadvantages. The current transformer directly connected to the primary cable is a low-voltage transformer, which does not need to withstand insulation stress and thermal stress. The outer shell is touchable and has high safety. The capacity is small, which is not compatible with the requirements of the State Grid. The State Grid requires a minimum secondary output capacity of 30 VA, but in actual engineering, the maximum secondary out...

AI Technical Summary

Problems solved by technology

The current transformer directly connected to the primary cable is a low-voltage transformer, which does not need to withstand insulation stress and thermal stress. The outer shell is touchable and has high safety. The capacity is small, which is not compatible with the requirements of the State Grid. The State Grid requires a minimum secondary output capacity of 30 VA, but in actual engineering, the maximum secondary output capacity of this transformer can only reach 15 VA, so it cannot meet the requirements. Use requirements, and the connection between the primary cable and the main circuit needs to be untied when replacing, the system power failure time is longer, and the impact on the continuity of the power supply system is greater; the current transformer installed in the inflatable compartment of C-GIS, the secondary output Large capacity, small transformation ratio and large capacity can be realized, but this kind of transformer needs to withstand insulation stress and thermal stress, and is connected to the main circuit through flat terminal blocks. Power outages, especially when gas operations are required, can have an environmental impact if the inflatable compartment is filled with greenhouse gases such as SF6

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