The outlet pressure of the lubricating oil pump is low. The setting value of the self-starting switch PSXL-08404 is 0.6MPa, and the operating pressures of the two switches are very close. Therefore, when the outlet pressure switch of the lubricating oil pump is slightly stagnant, it may cause the carbon dioxide compressor to trip first and then start. Lubricating oil auxiliary pump.
The short-circuit and disconnection experiments were carried out through the instrument switch, and the auxiliary pump self-starting condition was good.Through continuous calibration of the entire system, it is found that the pressure switch is slow when the pump outlet pressure is low.Checking the switch did not find any abnormality in the switch action.The pressure point of the low pressure interlock switch at the outlet of the lubricating oil pump is at the outlet of the oil pump. The pressure switch is installed in the switch cabinet. The length of the pressure guiding pipe between the pressure taking point is about 8m, and the inner diameter of the pressure guiding pipe is small.When the outlet pressure of the oil pump is low, due to the large internal resistance of the pressure guiding tube, the measuring element cannot release the pressure in time, causing the switch action to be slow and the response lagging, which causes the control oil pressure low interlock switch PSXL-08301 to act, causing the carbon dioxide compressor to trip. .
From the switch setting value, under normal conditions, the lubricating oil outlet pressure is 1.2MPa, the control pressure low switch PSXL-08301 trip value is 0.4MPa, the lubricating oil pump outlet pressure is low, the self-starting switch PSXL-08404 has a setting value of 0.6MPa, two switches The operating pressure is very close, so when the outlet pressure switch of the lubricating oil pump lags slightly, it may cause the carbon dioxide compressor to trip first, and then start the lubricating oil auxiliary pump.
Interlocking improvement plan and effect The key to solving this problem is to reduce the action lag of the lubricating oil low switch and start the auxiliary pump in time.For this reason, we changed the switch setting value from 0.6MPa to 0.8MPa, which not only reduces the lag time of the self-starting switch, but also increases the distance between the interlock trip value and the auxiliary pump self-start value, which basically avoids The phenomenon that the jump switch moves ahead.Several years of operation proved that the transformation was very successful. Not only did the auxiliary pump start lagging, but also the auxiliary pump frequently started.
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Link to this article：How to solve the lagging problem of the outlet pressure switch of the lubricating oil pump
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