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 pollution, which is not economical.

And at present, the above-mentioned instruments are offline detection instruments, which are generally placed in the laboratory. During gas detection, the measured gas needs to be manually taken out of the transformer, and then sent to the above-mentioned monitoring instruments for analysis and detection. The efficiency and real-time performance are low.

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