GIS (Geographic Information System) fault diagnosis system and method based on vibration signal spectrum analysis

Abstract

The invention discloses a GIS (Geographic Information System) fault diagnosis system and method based on vibration signal spectrum analysis, belonging to the field of GIS fault monitoring. The system comprises a vibration acceleration sensor, a charge amplifier, a data acquisition instrument and a PC (Personal Computer) all of which are successively connected together in series, wherein the vibration acceleration sensor comprises three vibration sensors which are fixed on the outer surface of a GIS box in the X-axis, Y-axis and Z-axis directions, respectively. The diagnosis method of the system comprises the following steps of: acquiring GIS vibration signals in the X-axis, Y-axis and Z-axis directions by means of the three vibration sensors; performing wavelet de-noising on the vibration signals intercepted by a full period and then performing spectrum analysis; calculating energy at 50 Hz and the sum of energy at 100 Hz, energy at 200 Hz and energy at 300 Hz respectively; comparing the calculated values with the normal state; and determining the GIS fault according to the result of comparison in combination with a threshold. The method is easy in engineering realization, obvious in feature and capable of effectively diagnosing the GIS fault.

Description

technical field [0001] The invention relates to an on-line monitoring technology for the state of power transmission and transformation equipment, in particular to a fault diagnosis system and method for a gas-insulated metal-enclosed switchgear (GIS), which belongs to the field of GIS fault monitoring. Background technique [0002] Gas-insulated metal-enclosed switchgear (GIS) was born in the early 1970s. It is a combination of electrical components such as circuit breakers, disconnectors, fast earthing switches, current transformers, lightning arresters, busbars, bushings, and cable terminals. In the metal shell, the interior is filled with 0.3~0.4MPa SF6 gas as the insulating medium. [0003] The role of GIS is equivalent to a switch station, which has the advantages of small size, small footprint, high operational reliability, no influence from external environment, flexible configuration, small maintenance workload, long maintenance cycle, and no electromagnetic interfe...

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Problems solved by technology

[0007] 1. The UHF detection method can perform fault diagnosis according to the waveform characteristics of the discharge pulse and the spectrum characteristics of the UHF signal. It has good detection sensitivity, but the structural design of the UHF sensor itself cannot suppress the interference from the high frequency band in the substation. This seriously affects the accuracy of the test results.

[0008] 2. High-frequency grounding current method, using well-made sensors can maintain good transmission characteristics in a wide frequency range, but the ground wire needs to pass through the coil, which makes on-site installation extremely inconvenient

[0009] 3. The optical measurement method does not have the problem of anti-interference, but the sensitivity is very low and a large number of sensors are required, so this method is not practical

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