On-line monitoring device and monitoring method for transformer on-load tap-changer status

Abstract

The present invention discloses a transformer on-load tap-switch state online monitoring device and a monitoring method thereof. The device comprises a vibration acceleration sensor, a Hall current sensor, an information collection control module, a power supply, a microprocessor, a display screen, a button, a memory, a clock, a communication interface, an alarm and an angular displacement sensor. The vibration acceleration sensor, the angular displacement sensor and the Hall current sensor are employed to realize online monitoring of the transformer on-load tap-switch state in the transformer on-load tap-switch state so as to have important meaning for improvement of safety operation of the transformer.

Description

technical field [0001] The invention relates to an on-line monitoring device for the state of a transformer on-load tap changer and a monitoring method thereof, which can be widely used in the field of on-line monitoring and maintenance of the transformer on-load tap-changer. Background technique [0002] The on-load tap changer is a switching device that provides a constant voltage for the transformer when the load changes. The basic principle is to switch between taps in the transformer winding without interrupting the load current, thereby changing the number of turns of the winding, that is, the voltage ratio of the transformer, and finally realizing the purpose of voltage regulation. [0003] In today's power transmission and transformation industry, large transformers are widely installed with on-load tap changers, which play an important role in ensuring the voltage quality of the system and users. At present, most developed countries have installed on-load tap-chang...

AI Technical Summary

Problems solved by technology

The sum of the opening distance and the overtravel is called the total stroke, that is, the total stroke = the opening distance + the overtravel. If the moving contact is worn due to excessive use, the opening distance will be lengthened, and the wear of the contact will cause the contact The contact area between the heads is reduced, the contact resistance is increased, and the arc is not easy to extinguish at the same time, which eventually leads to serious accidents such as switch burnout. At present, the detection of the opening distance and overtravel can only be carried out offline when the power is off. Mainly adopt Add a voltage excitation signal to the test circuit. Because the voltage excitation signal is added, the current will have a sudden change when the switch is just closed or disconnected, that is, from nothing to nothing or from nothing to nothing. In this way, according to the total stroke, the open distance and overtravel can be obtained after combining the just-point or just-close point, but the traditional method of just-close or just-close point can not meet the actual test requirements during online detection , the reason is that in the state of operation, the switch circuit has high voltage added, and the voltage excitation signal is not allowed to be added, which brings difficulties to the online detection of the switch just closing or just breaking point

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