A comprehensive fault diagnosis method and system for transformer turn-to-turn discharge

Abstract

The invention relates to an integrated fault diagnosis method and a system for turn-to-turn discharging of a transformer. The method comprises the steps of collecting ultrahigh-frequency partial discharging signals, ultrasonic partial discharging signals, pulse current partial discharging signals, primary voltage signals, secondary voltage signals and primary current signals; synchronously collecting and processing the ultrahigh-frequency partial discharging signals, the ultrasonic partial discharging signals, the pulse current partial discharging signals, the primary voltage signals, the primary current signals and the secondary voltage signals for recognizing the source type of partial discharging of the transformer; and comprehensively processing the ultrahigh-frequency partial discharging signals, the ultrasonic partial discharging signals, the pulse current partial discharging signals, the primary voltage signals, the primary current signals and the secondary voltage signals after being processed for obtaining the fault assessment of partial discharging of the transformer and achieving integrated fault diagnosis of turn-to-turn discharging of the transformer.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a comprehensive fault diagnosis method and system for transformer interturn discharge. Background technique [0002] As one of the most important electrical equipment in the power system, the power transformer's operation status is directly related to the safe, stable and economical operation of the power system. A failure of a power transformer will lead to a large-scale power outage and cause heavy losses to the national economy. According to statistics, most of the accidents in power transformers are caused by insulation aging and damage, and the main cause of transformer insulation failure is partial discharge inside the transformer. The main way of on-line monitoring of insulation faults. [0003] The on-line monitoring system for partial discharge of transformers has been applied in some countries, but the effect is not particularly ideal, especially for the identification and ...

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Problems solved by technology

[0003] The online monitoring system for partial discharge of transformers has been used in some countries, but the effect is not particularly ideal, especially for the identification and judgment of inter-turn discharge faults of transformers, which has certain limitations

At present, there is no relevant research on the diagnosis method of transformer inter-turn discharge fault in China, and it can only rely on the protection action of the transformer after the fault to trip the transformer and prevent the accident from further expanding.

[0004] Since the turn-to-turn discharge fault of the transformer takes a short time from the discharge signal to the transformer fault trip, the existing online monitoring technology cannot judge whether the transformer has a turn-to-turn fault, and cannot take effective measures to prevent the transformer from being damaged at the initial stage of the fault.

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