Electronic type transformer high voltage side redundant backup circuit and failure detection method

Abstract

The invention discloses a redundant backup circuit on the high-voltage side of an electronic transformer. A standby controller connected in parallel with the main controller and a corresponding multi-channel gating circuit are added to the high-voltage side circuit of the transformer. During the operation of the transformer, the The standby controller sleeps, and the main controller completes all the functions of the high-voltage side circuit. If the low-voltage side circuit judges that the high-voltage side circuit may have a fault, it wakes up the high-voltage side standby controller, and the standby controller sends a reset command to the main controller. , and test and diagnose the high-voltage side circuit. If it is confirmed that the main controller is faulty, the current work of the main controller will be switched to the standby controller to keep the transformer working normally, which overcomes the failure of the high-voltage side circuit due to the main controller. The defect that causes the transformer to fail to work, thus improving the reliability of the transformer; the present invention also discloses a fault detection method based on the aforementioned circuit, which provides fault location information for the inspection and maintenance of the transformer equipment, and facilitates the online detection of the equipment. maintain.

Description

technical field [0001] The invention relates to the transformer technology in the technical field of power system automation, in particular to a backup circuit and a fault detection method of an electronic transformer. Background technique [0002] The power transformer is one of the important electrical equipment in the power system. It plays a very important role in the accurate measurement of current / voltage, power metering, relay protection, system monitoring and system analysis in the power system. At present, the traditional electromagnetic current / voltage transformer is still widely used in the power system. With the continuous development of the power system and the continuous improvement of the grid voltage level, the insulation problems and magnetic saturation problems of the traditional electromagnetic current / voltage transformer, Inherent defects such as small dynamic range have become increasingly prominent, so electronic transformer technology has been proposed...

AI Technical Summary

Problems solved by technology

Since the high-voltage side circuit has been working in a harsh electromagnetic interference environment for a long time, once a fault occurs, the entire electronic transformer will not work normally, and it is difficult to repair and replace it under live conditions. Therefore, the reliability design of the high-voltage side circuit It is the key link to ensure the performance of electronic transformers

[0004] In the design of the high-voltage side circuit of the existing electronic transformer, the method of using conventional integrated circuit design is generally adopted, such as: using multi-channel gating and high-precision analog-to-digital conversion devices to realize time-division multiplexing of multiple signals, Then it is transmitted to the low-voltage side. In this way, the high-voltage side circuit is simple, but the function is single, and the flexibility is poor; there is also a realization method using single-chip microcomputer technology in the design of the high-voltage side circuit. Complicated functions, with the characteristics of flexible setting of data transmission mode between high / low voltage side and strong versatility

However, whether it is implemented by integrated circuits or single-chip microcomputers, there are defects such as short service life of transformers and poor system reliability.

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