In order to analyze the noise spectrum of converter substation and control the occupational exposure noise of operators at an acceptable level, this paper makes field measurement and spectrum analysis of occupational exposure noise of converter transformers, converter valve halls, AC filters and other operators in converter substations with different voltage levels. The results show that the noise energy of converter substation is mainly concentrated in the middle and low frequencies, and the sound pressure level of the line spectrum with even frequency doubling of 50Hz is prominent, and the frequency is concentrated in the frequency range of 100 ~ 1000 Hz. Except that the energy of the valve hall is still high at the high frequency, the sound pressure level of noise in other workplaces almost drops below 50dB when the frequency is higher than 5kHz. Based on this feature, noise control measures are put forward from three aspects: sound source control, sound insulation control and personnel protection.
In this paper, one 220kV substation has been selected in each prefecture level company of State Grid Shandong, Hebei and Shanghai. A total of 26 different types of 220kV substations are selected. Nbm-550 electromagnetic field detector is used to detect the power frequency electromagnetic field intensity in different areas of the substation, and the linear hybrid model is used to compare the power frequency electromagnetic field detection results in different areas, to study the distribution of power frequency electromagnetic field in different areas of 220kV substation workplace. The test results show that the higher the voltage level is, the higher the power frequency electric field is in the same type of distribution device area with different voltage levels in 220kV substation; AIS area is higher than GIS area, indoor switchgear area, and overhead outgoing line is higher than cable outgoing line. GIS device, cable and switch cabinet have good shielding effect on power frequency electric field and power frequency magnetic field.
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