Reasons for the increase in voltage and decrease in current in ion-exchange membrane electrolyzers, urgently
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Our factory has a rectifier unit; when the voltage on the grid side remains unchanged, the control angle of the rectifier cabinet suddenly drops, and it adjusts to a setting of 7 degrees and locks there. Finally, the DCS tripped. During this process, the slot voltage keeps rising from the beginning, while the DC output current keeps decreasing. The AC-side current and power also decrease. What is causing this? Thank you
The time from start to tripping is about 20 seconds
What substance is the load? Is it an electrolyte? First, check for any open circuits in the main circuit wiring. If it’s an electrolyte, it might have been diluted. In general, the main circuit impedance increases, the current decreases, and the voltage rises.
Have some bridge arms lost pulses?
Both the 3rd floor and the 4th floor could be possible. Switch to a constant-angle mode, use a clamp meter to measure the current on the AC side to check if it is balanced; if not, it’s possible that the thyristor is not being triggered.
If the voltage keeps rising linearly, it is likely due to an increase in the load impedance; as for the exact reason, it needs to be thoroughly investigated!
Based on the phenomenon you described, it is likely that an incorrect saltwater concentration in the process is causing the increased impedance.