Voltage transformer for GIS (Gas Insulated Switchgear)

Abstract

The invention discloses a voltage transformer for a GIS (Gas Insulated Switchgear). The voltage transformer for the GIS comprises a tank body and a GIS body; a basin type insulator is fixedly arranged on a tank body flange opening; the voltage transformer is connected with the GIS through a basin inlay which is arranged on the basin type insulator; an open-close device is arranged between the basin inlay and the GIS body; an insulated transmission rod is connected to the open-close device; combination and separation of the open-close device are achieved by operating the insulated transmission rod and accordingly disconnection or communication of the GIS and the voltage transformer are achieved. Opening the open-close device or not is achieved by operating the insulated transmission rod which is connected with the open-close device and the open-close device is connected with the GIS through the basin inlay, so that when the insulated transmission rod is operated to drive the open-close device to be opened, the voltage transformer is disconnected with the GIS; on the contrary, the voltage transformer is communicated with the GIS. According to the voltage transformer for the GIS, the open-close device is arranged inside the voltage transformer, so that the GIS is avoided being detached or assembled from the GIS when a pressure resistant test is performed after a predelivery test and field installation.

Description

【Technical field】 [0001] The invention relates to the field of voltage transformer manufacturing, in particular to a voltage transformer for GIS. 【Background technique】 [0002] Gas-insulated metal-enclosed switchgear (GIS) has the advantages of small footprint, all components are completely enclosed in a metal shell, little external environment interference, high reliability, easy installation in maintenance, and low operating costs. It has been widely used in industry. [0003] At present, GIS equipment needs to carry out the power frequency withstand voltage test after the factory test and field installation. In order to avoid the primary and secondary windings of the voltage transformer from being burned due to the power frequency The transformer is disconnected from the GIS equipment, and then connected to the GIS equipment after the test. [0004] At present, there are two schemes for disconnecting the voltage transformer. One is to directly remove the voltage transf...

AI Technical Summary

Problems solved by technology

The first scheme needs to remove the voltage transformer before the test, and then install the voltage transformer on the GIS equipment after the test, which not only increases the workload in the installation process of the GIS equipment, but also reduces the reliability of the installation. Device poses a security risk

The isolation switch element added in the second scheme is only used when the GIS equipment is subjected to the withstand voltage test, which increases the manufacturing cost of the GIS equipment invisibly, and neither meets the development requirements of energy saving or consumption reduction, nor does it meet the development of GIS equipment miniaturization trend

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