Device for controlling the process of desalting and dehydration of oil in an electric dehydrator

Claim 1

A device for controlling the process of desalting and dehydration of oil in an electric dehydrator having two electrodes: upper and lower, comprising in combination: a transformer to which are connected said electrodes; a current difference detector in the circuits of said electrodes having a current detector for said upper electrode inserted into the circuit of said upper electrode, a current detector for said lower electrode inserted into the circuit of said lower electrode and a substracter of said currents whose inputs are connected to the corresponding outputs of said current detectors; a unit shaping a signal corresponding to the real value of said currents in the circuits of said electrodes having a compensator of the direct-current component of said current difference in the circuits of said electrodes determined by the constructive parameters of said electric dehydrator, one input of the compensator being connected to the output of said substracter and the other input thereof being fed with a d-c compensating voltage; a commutator whose one input is connected to the output of said compensator; a differentiator whose input is connected to said current detector for the lower electrode; a pulse selector passing the pulses preceding the breakdown in said electric dehydrator, the input of the pulse selector being connected to the output of said differentiator; a network shaping a signal proportional to the current of said lower electrode and a signal indicating of the presence of said pulses, the input of the shaping network being connected to the output of said selector; a time-delay relay whose input is connected to one output of said shaping network through which is fed said signal indicating of the presence of pulses preceding the breakdown, while the output of said relay is connected to the second input of said commutator whose third input is connected to the other output of said shaping network through which is fed said signal proportional to the current of said lower electrode; an error detector whose input is connected to the outpUt of said commutator; a unit comparing the real value of the current difference in the circuits of said electrodes with a specified value; an actuating mechanism whose input is connected to the output of said error detector; a valve controlling the discharge of salt water and mud sludge from said dehydrator associated with said actuating mechanism.

Claim 2

A device for controlling the process of desalting and dehydration of oil in an electric dehydrator having two electrodes: upper and lower, comprising in combination: a transformer to which are connected said electrodes; a current difference detector in the circuits of said electrodes having a current detector for said upper electrode inserted into the circuit of said upper electrode, a current detector for said lower electrode inserted into the circuit of said lower electrode and a substracter of said currents whose inputs are connected to the corresponding outputs of said current detectors; a unit shaping a signal corresponding to the real value of said currents in the circuits of said electrodes having a compensator of the direct-current component of said current difference in the circuits of said electrodes determined by the constructive parameters of said electric dehydrator, one input of the compensator being connected to the output of said substracter and the other input thereof being fed with a d-c compensating voltage; a commutator whose one input is connected to the output of said compensator; a differentiator whose input is connected to said current detector for the lower electrode; a pulse selector passing the pulses preceding the breakdown in said electric dehydrator, the input of the pulse selector being connected to the output of said differentiator; a network shaping a signal proportional to the current of said lower electrode and a signal indicating of the presence of said pulses, the input of the shaping network being connected to the output of said selector; a time-delay relay whose input is connected to one output of said shaping network through which is fed said signal indicating of the presence of pulses preceding the breakdown, while the output of said relay is connected to the second input of said commutator whose third input is connected to the other output of said shaping network through which is fed said signal proportional to the current of said lower electrode; an error detector whose input is connected to the outpUt of said commutator; a unit comparing the real value of the current difference in the circuits of said electrodes with a specified value; an actuating mechanism whose input is connected to the output of said error detector; a valve controlling the discharge of salt water and mud sludge from said dehydrator associated with said actuating mechanism.