Signal generating device

Abstract

The invention discloses a signal generating device, including a single-chip microcomputer, and the first preset number of capacitors and relays. The capacitors are connected in series in sequence. One end of a series branch after the capacitors are connected in series is connected between a normally closed contact and a normally open contact of a first relay. The other end of the normally closed contact of the first relay is connected with a positive electrode of a power supply. A negative electrode of the power supply is connected separately with the other end of the series branch and one end of a partial discharge device. The other end of the partial discharge device is connected with the other end of the normally open contact of the first relay. The preset second number of capacitors at most in the series branch are connected in parallel with normally open contacts of the relays other than the first relay respectively. The single-chip microcomputer is connected separately with the normally closed contact and the normally open contact of the first relay and the respective normally open contacts of the relays connected in parallel with the capacitors. The invention provides a signal source for the partial discharge device, learns bandwidth characteristics of the partial discharge device and provides reference for an actual partial discharge test.

Description

technical field [0001] The invention relates to the technical field of partial discharge detection, in particular to a signal generating device. Background technique [0002] Partial discharge test has high sensitivity. For newly designed and manufactured high-voltage electrical equipment, the weak link in the insulation can be found in time through partial discharge measurement, so as to prevent errors in the design and manufacturing process and improper use of materials, which is an important way to identify the reliability of product insulation or equipment operation. method, which can find equipment defects that cannot be found by withstand voltage tests. Partial discharge test is one of the important items in the current preventive test of power equipment. [0003] GIS (Gas Insulated Substation Gas Insulated Substation) full name Gas Insulated Fully Enclosed Combined Electrical Appliance, is an important equipment in the power system. Due to its high sealing performan...

AI Technical Summary

Problems solved by technology

The frequency range of GIS UHF partial discharge test is about 300M-3GHZ. Due to the complex internal structure of GIS, the internal partial discharge generally covers the full frequency band, but when the partial discharge of the full frequency band is in the form of electromagnetic waves inside the GIS After transmission, the discharge of certain frequency bands will disappear (possibly attenuated by transmission, which may be attenuated by the internal structure of GIS). In actual production, use an oscilloscope or other partial discharge tester to receive the output frequency band of GIS. According to the received frequency band Analyzing and judging whether partial discharge occurs in GIS, the results obtained may be wrong, so it is impossible to accurately judge whether the insulation performance of GIS has deteriorated, and it cannot effectively prevent GIS substation accidents caused by GIS insulation failures

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