Measurement and Characteristic Analysis of Electromagnetic Disturbance of Coal Mine Fan Converter

Table 2

35 Hz basic parameter analysis.

Location	Data number	Frequency band range (MHz)	Dominant frequency (MHz)	Corresponding amplitude (dBμV/m)
Near the output power cable of converter	018	0–50	2.38	99.70
			10.10	86.00
			20.20	77.80
			30.90	65.70
			44.40	55.60
	023	0–20	2.31	94.30
			10.30	80.70
			16.20	81.50
	027	20–200	32.50	82.30
			42.70	75.10
Near the input power cable of converter	022	0–20	2.22	85.56
			11.30	78.82
			14.33	83.77
			17.71	77.36
	026	20–200	27.43	84.46
			33.70	74.64
			44.65	65.38
Output connecting motor cable close to the motor side	020	0–50	2.39	95.16
			9.74	85.38
			20.17	83.42
			33.28	65.87
	025	0–20	2.48	89.22
			9.70	75.24
			13.90	80.08
	028	20–200	20.39	76.48
			24.70	75.44
			34.48	74.14
			41.91	68.76