A brief description of the technology of a ring capacitor voltage divider for linearity calibration of impulse voltage divider

作者： GOZ Electric 时间：2024-06-13 09:26:20 阅读：11

The present invention relates to the field of electrical measurement technology, and in particular, to a ring capacitor voltage divider for linearity calibration of an impulse voltage divider.

Background technology

At present, linearity is a key technical parameter for measuring a resistor voltage divider. It is an uncertainty component that cannot be ignored in impulse voltage value traceability research and value transfer, and is characterized by changes in the applied voltage and the voltage divider ratio of the voltage divider. Whether it is impulse voltage value traceability research, or type test, factory test, routine test, and periodic calibration of the voltage divider, linearity measurement is a necessary measurement item. The existing voltage divider for measuring the linearity of an impulse voltage divider has an internal structure with capacitors and weak damping, inductance, and poor frequency response; the connection line between the impulse voltage generator and the voltage divider for measuring the linearity of the impulse voltage divider, and the connection line between the voltage divider and the voltage divider for measuring the linearity of the impulse voltage divider all use high-voltage leads, and the high-voltage leads have high stray inductance, large damping resistance, and poor anti-interference ability, which makes the measurement of the linearity of the impulse voltage divider inaccurate.

Invention content

In view of this, the present invention proposes a ring-shaped capacitive voltage divider for linearity calibration of impulse voltage divider, aiming to solve the problem that the existing voltage divider has poor frequency response, high stray inductance, poor anti-interference ability, and leads to inaccurate linearity measurement of impulse voltage divider.

In one aspect, the present invention proposes a ring-shaped capacitive voltage divider for linearity calibration of impulse voltage divider. The ring-shaped capacitive voltage divider for linearity calibration of impulse voltage divider comprises: a conductive shell and a guide rod, a low-voltage arm and a data acquisition device; wherein the guide rod is inserted into the shell, and the guide rod and the insertion part of the shell are insulated, the first end of the guide rod is used to connect with the impulse voltage generator, and the second end of the guide rod is used to connect with the voltage divider; the low-voltage arm is placed in the shell, and the low-voltage arm includes a capacitor, the first end of the capacitor is electrically connected to the shell, and the second end of the capacitor is electrically connected to the guide rod; the first input end of the data acquisition device is electrically connected to the first end of the capacitor, and the second input end of the data acquisition device is electrically connected to the second end of the capacitor, for collecting the voltage at both ends of the capacitor.

Its capacitor body is formed by connecting a plurality of capacitors equally distributed along the circumference in parallel.

Its low-voltage arm also includes: a matching resistor; wherein the first end of its matching resistor is electrically connected to the second input end of its data acquisition device, and the second end of its matching resistor is electrically connected to the second end of each capacitor.

Its low-voltage arm also includes: a first circuit board and a second circuit board; wherein the first circuit board is electrically connected to its housing, and the second circuit board is electrically connected to its guide rod; and the first end of each capacitor is connected through its first circuit board, the second end of each capacitor is connected through its second circuit board, and the second end of its matching resistor is electrically connected to its second circuit board; the first input end of its data acquisition device is electrically connected to its first circuit board.

Its first circuit board and its second circuit board are arranged in parallel, and its matching resistor and its capacitor body are both placed between its first circuit board and its second circuit board; its first circuit board is provided with a first through hole, and an insulating ring is arranged in its first through hole, and the connection between the first end of its matching resistor and the second input end of its data acquisition device is passed through its insulating ring; its second circuit board is provided with a conductive connecting rod, and its connecting rod is electrically connected to its guide rod.

Its low-voltage arm also includes: a shielding shell; wherein its capacitor, its matching resistor, its first circuit board and its second circuit board are all placed in its shielding shell; its shielding shell is a conductive shell with one end open, and the open end cover of its shielding shell is provided with a first insulating cover, and its first insulating cover is provided with a second through hole, and its connecting rod is passed through its second through hole; its shielding shell is electrically connected to its shell, and its first circuit board is electrically connected to its shielding shell; its shielding shell is provided with a third through hole, and the connecting line between its matching resistor and its data acquisition device, and the connecting line between its first circuit board and its data acquisition device are all passed through its third through hole.

It also includes: an attenuator placed in its shell; wherein its first circuit board is electrically connected to the first input end of its attenuator, its first end of the matching resistor is electrically connected to the second input end of its attenuator, its first output end of its attenuator is electrically connected to the first input end of its data acquisition device, and its second output end of its attenuator is electrically connected to the second input end of its data acquisition device.

Its data acquisition device is placed in its shell.

Its shell is an annular body with openings at both ends, and both ends of the shell opening are covered with second insulating covers, and the two second insulating covers are coaxially provided with fourth through holes, and its guide rod is passed through its fourth through hole, and both ends of its guide rod extend out of its shell for a distance.

It also includes: a damping resistor; wherein, the first end of its guide rod is provided with a mounting hole, and its damping resistor is mounted in its mounting hole, and its damping resistor is placed outside its shell.

The internal structure of the annular capacitor voltage divider for linearity calibration of the impulse voltage divider in the present invention is a pure capacitor structure, without inductance, and has good frequency response. The guide rod is used to replace the connecting wire between the impulse voltage generator and the annular capacitor voltage divider for linearity calibration of the impulse voltage divider, and the connecting wire between the annular capacitor voltage divider for linearity calibration of the impulse voltage divider and the voltage divider, and the stray inductance is low, the damping resistance is small, and the anti-interference ability is strong, so that the linearity measurement of the impulse voltage divider is more accurate.

Note: To protect information, the attached figure is omitted!