The relationship between the electrolytic powder, hydraulic tank, and water resistance soft starter cabinet Electrolytic powder is used in the water resistance soft starter cabinet, and the hydraulic tank is used to hold the electrolytic powder and water mixed in a certain ratio. The water resistance soft starter cabinet is a motor starting device that has been widely used in recent years. Water resistance, or liquid resistance (formed by adding electrolytic powder to water to create water resistance), refers to the insertion of liquid resistance in the motor stator circuit (squirrel-cage motor) or rotor circuit (wound motor). During the starting process, the liquid resistance value gradually decreases to near zero within a predetermined time, automatically disconnecting the liquid resistance, allowing the motor to enter normal operation, enabling it to start 2-3 times per hour. The operation process of the water resistance cabinet: When the high-voltage switch cabinet is closed, the water resistance cabinet receives the closing signal from the high-voltage switch cabinet. The moving electrode plate of the water resistance cabinet starts to operate from top to bottom. During the movement of the moving electrode plate within the set time, the resistance value gradually decreases. When the resistance approaches zero, a limit switch activates the vacuum contactor inside the water resistance cabinet, short-circuiting the water resistance, completing the motor start-up. After a few seconds of delay, the moving electrode plate automatically resets to its original position, waiting for the next start. If the water resistance cabinet does not complete the start-up within the predetermined time, it will emit a fault alarm signal, automatically disconnecting the switch cabinet to ensure the motor remains closed. Actual data and control logic referenced on-site (1) Generally, during water resistance start-up, the starting current multiplier is between 2 and 3.5 times, and the voltage drop on the network side can meet the capacity requirements of the upper-level transformer; (2) Depending on the size of the motor, the starting time is generally set between 20 and 40 seconds, and the time is usually adjustable. If it exceeds 40 seconds, the switch cabinet will have inverse time limit protection; (3) "Water resistance start signal." Currently, most water resistance cabinets are controlled by PLC. The start signal for the water resistance cabinet is taken from the "circuit breaker closed status" of the corresponding switch starter cabinet. This means that when the customer's switch cabinet circuit breaker is closed, the PLC of the water resistance cabinet receives the signal and begins to start, with the electrode plate starting to move down; (4) When the circuit breaker of the switch cabinet opens, the PLC of the water resistance cabinet receives the signal and disconnects the short-circuit contactor; (5) In other words, the condition for the action of the water resistance cabinet contactor is that the high-voltage circuit breaker QF0 is closed (taken from the normally open point of QF0).