Online monitoring system and method for partial discharge of intelligent switch cabinet based on ultra-high frequency detection

Abstract

The invention discloses an online monitoring system and a method for partial discharge of an intelligent switch cabinet based on ultra-high frequency detection. The online monitoring system comprises a sensor unit, a signal conditioning unit, a MCU (Micro Control Unit) unit, a communication unit, a system power supply and an upper machine monitoring unit. The online monitoring method comprises the following steps that: the sensor unit finishes collection of partial discharge signals in the switch cabinet; the signal conditioning unit realizes amplification, filtering, frequency reduction and bias of the signals, thus obtaining signals which can be converted by an ADC (Analog to Digital Converter) module in a DSP (Digital Signal Processor); the MCU unit realizes analysis and procession of the signals; and data are uploaded to an upper machine in a monitoring room through an Ethernet. According to the online monitoring system and the method for the partial discharge of the intelligent switch cabinet based on the ultra-high frequency detection disclosed by the invention, collection and procession of high-frequency signals conducted by the DSP are realized by adopting a frequency spectrum shifting technology; a time-frequency analysis technology and a mode identification theory are applied to the monitoring system, therefore, the monitoring system is functional in fault diagnosis; and in addition, an IEC61850 standard is adopted by the system, consequently, management of various IEDs (Intelligent Electronic Devices) and interconnecting as well as networking of equipment in a transformer substation are convenient.

Description

technical field [0001] The invention relates to an on-line monitoring system for partial discharge of high-voltage power equipment and an operation and fault diagnosis method, and is especially suitable for on-line monitoring and fault diagnosis of ultra-high frequency partial discharge signals of high-voltage switch cabinets in intelligent substations. Background technique [0002] With the development of national smart grid technology, real-time status monitoring and fault diagnosis of key parts of substation main equipment have become an important indicator to measure the reliable operation of the power grid. High-voltage switchgear is an important part of intelligent substation. By developing a monitoring system suitable for partial discharge of high-voltage switchgear, real-time monitoring of local discharge and insulation performance of main equipment, mastering equipment operation, timely detection of hidden troubles, and taking measures to repair and deal with them ,...

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