Arc light detecting device for oil immersed transformer and working method thereof

Abstract

The invention relates to an arc light detecting device for an oil immersed transformer. The arc light detecting device comprises an arc light probe device and a fixing plate; the arc light probe device is inlaid on a fixing plate and fixed to an upper surface of the transformer casing by the fixing plate; the arc light probe device comprises a light transmission sleeve, a probe housing, an arc light collection comparison unit and a filter; the probe housing is fixed in the light transmission sleeve; the filter is disposed on the bottom of the light transmission sleeve; and the arc light collection and comparison unit is disposed in the probe housing. The arc light detecting device can detect the arc light in a transformer oil medium, perform corresponding signal processing on the collectedsignal, and eliminate the influence of the interference signal and other detection errors through a digital filtering module, and effectively highlight the features of an original signal. The correctaction signal is transmitted to the subordinate relay protection device through a signal feature comparison module, thereby avoiding the malfunction of the protection and the untimely protection.

Description

technical field [0001] The invention relates to the field of transformer arc light detection, in particular to an arc light detection device for oil-immersed transformers. Background technique [0002] The existing arc light detection probes mostly use: 1. Ultraviolet light is used as the detection object, and the arc light in the air medium is concentrated in the ultraviolet light band of 200~400nm. The generation of arc light is judged by the variation of detected ultraviolet light. The arc light detected by this probe is based on the arc discharge in the air medium, while the arc light spectrum in the transformer oil medium is mainly concentrated in the infrared light band of 700~1000nm, so this probe cannot be applied to the arc in the oil-immersed transformer light detection. 2. The current arc light probe is only used as a signal receiving and transmission device without a signal processing module. For example, the arc light protection devices currently used in switc...

AI Technical Summary

Problems solved by technology

The arc light detected by this probe is based on the arc discharge in the air medium, while the arc light spectrum in the transformer oil medium is mainly concentrated in the infrared light band of 700~1000nm, so this probe cannot be applied to the arc in the oil-immersed transformer light detection

2. The current arc light probe is only used as a signal receiving and transmission device without a signal processing module. For example, the arc light protection devices currently used in switch cabinets and low-voltage bus bars often cause errors in the next level of protection due to the influence of stray light. action

The main reason for misoperation is that the processing of the received signal is not in place, resulting in the transmission of wrong action signals to the next-level relay protection device.

3. At present, most of the probes are mostly considering its sensitivity and accuracy, and the protection of the probe itself is not in place, especially when detecting the arc light of oil-immersed transformers, the probe needs to be in contact with the oil medium, and the arc discharge in the oil medium With the sharp increase of temperature and heat, the insulation and protection of the arc light probe itself is more important

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