Inspection system for evaluating electrical parts for unwanted partial discharge

摘要

An electrical part testing system for evaluating quality of an insulated electrical part, including a computer-controlled switching apparatus for providing an original voltage to the electrical part automatically according to a pre-established testing scheme calling for provision of voltage to each phase of the part, in turn, while grounding the other phases of the part. A high-frequency filter for receiving receive the original voltage, receiving a load voltage emanating from the electrical part in response to the part receiving the original voltage, and filtering the original voltage from the load voltage to isolate any partial-discharge voltage added to the original voltage by the electrical part while the part is being electrified by the original voltage, yielding a filtered signal. A computing device determines, based on a comparison of a peak amplitude of the partial-discharge inception voltage to a voltage threshold, the quality of the electrical part being tested.

主权项

1. An electrical part testing system, for evaluating quality of an insulated electrical part, comprising:
a computer-controlled switching apparatus configured and arranged to:
receive, from a computing device, a pre-determined testing scheme corresponding to the electrical part;receive, from a voltage source, an original voltage having a pre-determined voltage level; andprovide the original voltage to the electrical part automatically according to the pre-established testing scheme; a high-frequency filter configured and arranged to:
receive the original voltage;receive a load voltage emanating from the electrical part in response to the part receiving the original voltage; andfilter the original voltage from the load voltage to isolate any partial-discharge inception voltage added to the original voltage by the electrical part while the part is being electrified by the original voltage, yielding a filtered signal; and the computing device being configured and arranged to:
receive, from the high-frequency filter, the filtered signal;compare a peak amplitude of the filtered signal to a voltage threshold, in a comparison; anddetermine, based on the comparison, the quality of the electrical part being tested.