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

Table 3

20 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	008	0–20	2.40	92.10
			10.27	74.15
			14.98	80.68
	007	0–50	2.28	96.39
			10.16	85.19
			14.74	86.76
			20.71	76.89
			42.97	69.87
	0032	0–50	2.73	97.50
			10.49	88.31
			21.14	80.25
			31.07	66.54
			41.00	56.25
	013	20–200	21.96	79.51
			41.91	70.61
Near the input power cable of converter	004	0–50	2.28	67.08
			11.33	67.34
			14.85	74.47
			17.08	66.26
			26.88	56.16
	012	20–200	27.04	73.61
			35.26	64.09
3 m from the converter	009	0–20	0.58	60.85
			2.44	57.00
			4.86	50.01
	010	0–20	2.48	51.03
			4.77	45.11
Output connecting motor cable close to the motor side	006	0–50	2.39	98.09
			9.63	88.12
			19.90	83.44
			26.70	71.40
			33.00	65.07