Comprehensive online monitoring device for distribution transformer

Abstract

The invention relates to a comprehensive online monitoring device for a distribution transformer. The comprehensive online monitoring device comprises a signal conditioning and filtering circuit, a master control circuit, a communication circuit, and a power supply circuit. The power supply circuit supplies power to the master control circuit and the communication circuit. The master control circuit is in communication connection with the communication circuit via a RS232 serial circuit. The signal interface of the master control circuit is connected with the signal conditioning and filtering circuit. The signal conditioning and filtering circuit is connected with, via a shielding detection line, an infrared spectrum sensor, a ultrahigh frequency and ultrasonic sensor, a current transformer, a voltage transformer, a temperature sensor and pressure sensor which are distributed in the transformer. The comprehensive online monitoring device is installed at distribution transformer field, acquires analog signals, performs conditioning, filtering, and analog-to-digital conversion on the analog signals, performs intelligent determination by a single-chip microcomputer, and sends short messages including distribution transformer abnormal information to a monitoring center and a distribution on-duty cell phone via a GSM network. Monitoring center monitoring system software gives a prompt about the specific position and the fault type of a faulted distribution transformer according to the obtained distribution transformer running state information.

Description

technical field [0001] The invention relates to an on-line monitoring device, in particular to a comprehensive on-line monitoring device for distribution transformers, and to the technical field of on-line monitoring equipment for power equipment. Background technique [0002] As one of the most important and expensive equipment in the power system, the power transformer's safe operation is of great significance to ensure the reliability of power supply. In order to improve the reliability of power system operation and reduce the economic losses caused by failures and accidents, it is necessary to conduct insulation preventive tests on transformers regularly. If the transformer is powered off for preventive tests, it will affect the normal power supply. Therefore, online monitoring of transformer operating conditions has received more and more attention. [0003] At present, most online monitoring systems monitor a single parameter of a single device. To reflect the operat...

AI Technical Summary

Problems solved by technology

[0003]At present, most of the online monitoring systems monitor a single parameter of a single device, but to reflect the operation status of a transformer, relying on a single performance index can only be obtained from a certain It is difficult to fully reflect the operating state of the transformer by reflecting its insulation state from the side

In addition, because the working environment of this type of monitoring equipment is relatively complicated, the working temperature is high, and it is greatly affected by electromagnetic interference, the sampling accuracy is often reduced due to electromagnetic interference, and fault detection is inaccurate. Device life

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