Sulfur hexafluoride gas-filled type current transformer insulation state on-line monitoring system and method

Abstract

The invention discloses a sulfur hexafluoride gas-filled type current transformer insulation state on-line monitoring system and method. A first switch solenoid valve of the current transformer is connected to a pressure stabilizing valve. An output terminal of the stabilizing pressure valve is connected to an infrared sensor and an electrochemical sensor. The electrochemical sensor is connected to a pressure pump through a second switch solenoid valve. The pressure pump is connected to a pressure regulating valve. The pressure regulating valve can communicate with a gas supplementing port of the transformer. The first switch solenoid valve can communicate with the gas supplementing port of the transformer. The method comprises steps that: a first hand-operated valve and a second hand-operated valve are opened, and the first switch solenoid valve is opened; when the pressure in the pressure stabilizing valve reaches one time the atmospheric pressure, the first switch solenoid valve is closed; SF6 purity and SO2 content in a gas sample are measured; the second switch solenoid valve is opened; the pressure pump is opened; the pressure regulating valve is opened, and the gas is delivered back to the current transformer; the second switch solenoid valve is closed; and the pressure pump is closed. With the monitoring system and the method provided by the invention, on-line monitoring is realized with good real-time performance. Tested gas sample is delivered back to the gas-filled type current transformer, such that gas loss and atmosphere pollution are reduced.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of high-voltage electrical equipment, in particular to an on-line monitoring system and method for the insulation state of a sulfur hexafluoride inflatable current transformer. technical background [0002] Currently, existing technologies for SF 6 (Sulfur hexafluoride) gas-insulated high-voltage electrical equipment on-line monitoring and diagnosis items mainly include mechanical failure detection and gas analysis and detection, of which gas analysis and detection is the diagnosis of SF 6 The internal working condition of gas-insulated equipment is a relatively novel method, which is used for on-site detection and equipment maintenance of high-voltage electrical equipment. [0003] SF 6 The stability and reliability of electrical equipment depends entirely on SF 6 Gas purity, if SF 6 If there are impurities in the gas, if it fails to meet the specified standards, then its arc extin...

AI Technical Summary

Problems solved by technology

However, the above-mentioned detection instruments have a common shortcoming, that is, the gas after detection will not return to SF 6 Gas-insulated high-voltage electrical equipment, so for small SF such as gas-filled current transformers 6 For electrical equipment, the proportion of sample gas consumed in the detection process is relatively large, and it causes environmental poll

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