Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators

Table 3

Temperatures in the pads of upper journal bearing of a LHG.

Operating condition		Pad number 4		Pad number 12
		L. Edge	T. Edge	L. Edge	T. Edge
	[MW]	[°C]	[°C]	[°C]	[°C]
78.5	0	35.3	37.8	35.9	39.5
92.3	0	43.3	48.4	45.2	51.5
92.3	600	44.8	48.1	47.1	53.7
92.3	700	47.0	49.7	49.2	56.0
92.3		55.2	58.6	57.3	64.6

the last measurement with 700 MW, a reduction of 10% in the bearing cooling capacity was created artificially by adequately reducing the water flow in the heat exchangers.