Fault on-line diagnosis and early warning method of flameproof dry-type transformer for mine

A dry-type transformer and explosion-proof technology, which is applied in the field of on-line fault diagnosis and early warning of mine explosion-proof dry-type transformers, can solve problems such as large discharge amplitude, initial phase shift of discharge, and accelerated transformer insulation effects, achieving The effect of eliminating potential safety hazards, improving accuracy, and reducing failure losses

CN102221651AActive Publication Date: 2011-10-19TAIYUAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-10-19

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Abstract

The invention provides a fault on-line diagnosis and early warning method of a flameproof dry-type transformer for mine in order to raise the accuracy and rapidity of fault diagnosis. The method comprises the following steps: determining monitoring quantity; extracting characteristic values: extracting a three-dimensional spectra parameter and two-dimensional statistical parameter in a partial discharge signal as characteristic quantities, with regard to operation voltage, current and iron core leakage current, extracting effective values of the operation voltage, the current and the iron core leakage current as characteristic values, and taking real-time values of a temperature parameter as characteristic quantities; using a normalization method to calculate a corresponding value of each characteristic quantity and taking the corresponding value as an input parameter of an intelligent diagnosis system; collecting values of each monitoring quantity under different environment, and obtaining training and testing samples of a nerve network under corresponding environment; establishing a nerve network: selecting a generalized RBF nerve network intelligent diagnosis method to establish a nerve network; utilizing a sample data training nerve network and forming a fault diagnosis tool; establishing a database; storing collected real time data and the above diagnosis result into a ground server real-time database and a real-time early warning information table, and carrying out diagnosis and early warning through an expert system.
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Description

technical field

[0001] The invention relates to the field of fault diagnosis of large-scale power equipment used in mines, in particular to an on-line fault diagnosis and early warning method for flameproof dry-type transformers used in mines. technical background

[0002] There are many reasons for the failure of mine explosion-proof dry-type transformers, among which partial discharge is one of the main reasons for insulation aging and breakdown. The partial discharge of the winding is mostly caused by the overvoltage of the winding. Long-term discharge will cause the temperature of the winding to rise, which will lead to insulation breakdown and short-circuit fault of the winding. Overcurrent will also cause the temperature of the transformer to rise, resulting in carbonization of the insulation, an increase in the amplitude of partial discharge, and a shift in the discharge phase; poor cooling of the winding, overload, and long-term operation will cause insulation aging;...

Examples

Embodiment Construction

[0022] (1) The system hardware of the present invention mainly includes monitoring sensors corresponding to each monitoring quantity, a monitoring device, an underground industrial computer (computer), a ground server (computer) and the like. The monitoring device includes hardware circuit modules such as signal acquisition, filtering, amplification and other signal processing and data transmission. The monitoring device, industrial computer and corresponding power supply device are placed in an explosion-proof housing, the industrial computer is connected to the monitoring device through a communication cable, and the server placed in the ground dispatching room is connected to the underground industrial computer through Ethernet. Install three through-hole current sensors on the three phases connected to the transformer in the mobile substation high-voltage power distribution device to monitor the three-phase operating current; install a pulse current sensor on the neutral po...