Differential D-dot voltage sensor

Abstract

The invention discloses a differential D-dot voltage sensor, which comprises a measuring module, an electrode plate, a signal modulation module and a collection transmission module, wherein the measuring module is provided with a first input end and a second input end, the electrode plate is provided with a first electrode and a second electrode, the measuring module is a differential amplification module, the differential amplification module is used for measuring the differential voltage between conducting layers, the sensor is not in grounding contact and is also not in direct contact with a tested conductor, and the output is floating potential difference, so the sensor can reduce the size of an insulation structure. Because the differential structure carries out non-contact measurement on the same potential, no direct energy transmission exists between the tested conductor and the sensor, and the influence cannot be generated on the input side when the sensor generates fault such as insulation breakthrough or output short circuit. The differential D-dot voltage sensor can solve the non-contact electrodeless voltage measurement problem of an intelligent electric network and can be used for 10kV to 35kV voltage measurement.

Description

technical field [0001] The invention belongs to the field of voltage sensors and relates to a differential D-dot voltage sensor made of a PCB board. Background technique [0002] Potential transformers are widely used in power systems, and their accuracy and speed play a very important role in energy measurement and relay protection, system monitoring and diagnosis, and power system fault analysis. Currently, electromagnetic voltage transformers (Potential Transformer, PT) and capacitive voltage transformers (Capacitive Voltage Transformer, CVT) are mainly used in power systems. The traditional electromagnetic voltage transformer has the problems of large volume and insulation difficulty increasing with the increase of voltage level. At the same time, due to the iron core, ferromagnetic resonance overvoltage may occur and the dynamic range caused by ferromagnetic saturation may occur. Disadvantages such as becoming smaller have become less and less suitable for the current ...

AI Technical Summary

Problems solved by technology

However, due to the limit value of its transfer function, a post-stage integrator is required, so that when it is used as a power transformer, its low-frequency performance and sensitivity may be affected by the integration circuit, and because the measurement resistance is grounded, its insulation strength and transformer volume are small in design. will cause conflicts, and it is not easy to promote in the smart grid

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