Circuit structure of a transformer partial discharge ultrasonic sensor
An ultrasonic sensor, partial discharge technology, applied in testing circuits, testing dielectric strength, etc., can solve the problems of difficulty in accurately locating the position of partial discharge in transformers, low sensor sensitivity, and many waveform distortions, achieving good waveform output and circuit principle. Simple, less component usage
Active Publication Date: 2016-09-07
STATE GRID CORP OF CHINA +3
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Problems solved by technology
The signal-to-noise ratio of the traditional transformer partial discharge ultrasonic circuit is low, the waveform distortion is more when the signal is output, and the sensitivity of the sensor is low, so it is difficult to accurately locate the position of the partial discharge of the transformer
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[0015] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.
[0016] A transformer partial discharge ultrasonic sensor circuit structure, including an ultrasonic sensor 1, a filter 2, a first-stage amplifier 3, a second-stage amplifier 4, a third-stage amplifier 5, an integrator 6, a follower 7, a negative feedback circuit 8 and Voltage bias circuit 9, the ultrasonic sensor 1, filter 2, first-stage amplifier 3, second-stage amplifier 4, third-stage amplifier 5, integrator 6, follower 7 are connected in sequence, the input of negative feedback circuit 8 The terminal is connected to the follower 7, the output terminal is connected to the second-stage amplifier 4, and the output terminal of the voltage bias circuit 9 is connected to the second-stage amplifier 4, the third-stage amplifier 5, the integrator 6, and the negative feedback circuit 8 respectively. connect.
[0017] The ultrasonic sensor 1 is a 40-3...
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The invention relates to a transformer partial discharge ultrasonic sensor circuit structure, and belongs to the technical field of a power supply detection device. The technical scheme is as follows: an ultrasonic sensor (1), a filter (2), a first amplifier (3), a second amplifier (4), a third amplifier (5), an integrator (6) and a follower (7) are successively connected. A negative feedback circuit (8) has an input end mutually connected with the follower and an output end mutually connected with the second amplifier (4). The output end of a voltage bias circuit (9) is mutually connected with the second amplifier (4), the third amplifier (5), the integrator (6) and the negative feedback circuit respectively. The transformer partial discharge ultrasonic sensor circuit structure has the following advantages: the circuit principle is simple, only a small number of components are used, the amplification multiple can be adjusted, the output signal-to-noise ratio is high, the waveform output is good, the sensitivity is high, and ultrasonic signals generated by partial discharge of a transformer can be rapidly captured, therefore, the transformer partial discharge ultrasonic sensor circuit structure is especially suitable for partial discharge detection of the transformer.
Description
technical field [0001] The invention relates to a transformer partial discharge ultrasonic sensor circuit structure, which belongs to the technical field of power supply detection equipment. Background technique [0002] In recent years, with the rapid development of the power system, the capacity and voltage level of transformers have been continuously improved, and more and more attention has been paid to safety issues during operation. In the faults of transformers, insulation problems account for a large proportion, so an effective means is needed to monitor the insulation status of transformers to ensure the safety of transformers in operation. Partial discharge detection is an effective means to detect transformer insulation. Both detection theory and detection technology have achieved great development in recent years, and have been practically applied in power plants and power stations. Ultrasonic detection of transformer partial discharge has become a hot topic of ...
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IPC IPC(8): G01R31/14
Inventor 岳国良高艳海刘宏亮康勇曹康
Owner STATE GRID CORP OF CHINA