Distribution transformer fault detection method and detection device

Abstract

The invention discloses a distribution transformer fault detection method and device in the technical field of fault detection. The distribution transformer fault detection device comprises a distribution transformer, a mutual inductor, an infrared temperature detector and a cooling mechanism. A primary side three-phase winding and a secondary side three-phase winding are arranged in the distribution transformer; the mutual inductor and the infrared thermoscope are respectively arranged beside the primary side three-phase winding and the secondary side three-phase winding; the cooling mechanism comprises a cooling mechanism and a detection mechanism; the cooling mechanism and the detection mechanism are respectively arranged at the lower end of the distribution transformer, and the mutual inductor is externally connected with an online detection system; the mutual inductor is used for detecting electrical signals of the primary side three-phase winding and the secondary side three-phase winding; the on-line detection system is used for receiving electrical signals of the primary side three-phase winding and the secondary side three-phase winding to calculate the loss power change rate of the distribution transformer and determining the maintenance strategy of the distribution transformer according to the loss power change rate.

Description

technical field [0001] The invention relates to the technical field of fault detection, in particular to a fault detection method and a detection device for a distribution transformer. Background technique [0002] Distribution transformers (referred to as distribution transformers, 35KV and below, mainly 10KV) are distributed in every corner of towns and villages, with a large number and complex distribution. As the core equipment in the power system to realize electric energy conversion, the distribution transformer, once it fails, will cause power outages, affecting people's normal life, and cause serious accidents such as fires and explosions, causing major economic losses. [0003] The traditional fault detection of distribution transformers mostly monitors the temperature and power consumption in the transformer through sensors, and then sends out alarms, and then eliminates the faults manually; this method has the following disadvantages. First, it is susceptible to e...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a distribution transformer fault detection method and detection device, to solve the problem of the traditional distribution transformer fault detection in the above-mentioned background technology, and to monitor the temperature and power consumption in the transformer through sensors. Alarm, and then eliminate the fault through manual risk removal; this method has the following disadvantages, first of all, it is easily affected by the ambient temperature, resulting in deviations between the measured value of the sensor and the actual heat production value of the transformer, and the ambient temperature is different. The ratio of the deviation is different; secondly, when the temperature rises abnormally, it is necessary to manually eliminate the danger in time. If the manpower cannot arrive in time, the transformer can only be disconnected by itself to avoid the danger caused by the temperature rise, which will further lead to long-term occurrence in the area. Power outages increase the labor intensity and work requirements. There is no coordination for troubleshooting, and it is impossible to delay enough time for the arrival of labor. Further, in order to enable labor to eliminate dangers in time, it is necessary to increase the density of personnel. The problem of increased labor costs

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