I. Management regulations
According to the State Grid Corporation's "High-voltage Switchgear Operation Management Regulations" (2005), when the operating mechanism is defective, it should be dealt with in a timely manner.
Second, the type and principle of the operating mechanism
    The electromagnetic operating mechanism completely relies on the electromagnetic suction generated by the closing current flowing through the closing coil to close the trip spring and simultaneously relies on the trip spring to provide energy during the trip.
    The working principle of the permanent magnet operating mechanism is similar to that of the electromagnetic type. The driving shaft is made of permanent magnet material, and the electromagnetic coil is surrounded by the permanent magnet. Under normal circumstances, the electromagnetic coil is not energized. When the switch is to be opened or closed, the principle of magnetic attraction or repulsion is used to change the polarity of the coil to drive the opening or closing.
    The spring operating mechanism is a mechanical operating mechanism that uses a spring as an energy storage element. The energy storage of the spring is accomplished by means of a motor through a reduction gear and is maintained in a stored state via a locking system. When breaking, the lock is released by magnetic force, the spring releases energy, and the contact is moved through the mechanical transmission unit.
    The pneumatic operating mechanism is a driving operation that uses compressed air as the power to perform the opening operation, and is supplemented by the closing spring as the operating mechanism for closing the energy storage component. The compressed air is stored by the self-prepared compressor. During the opening process, the closing spring is used to store the energy through the cylinder piston. At the same time, the contact is completed by the mechanical transmission unit, and the closing spring is passed through the locking system. Keeping in the state of energy storage. When closing, the lock is released by magnetic force, and the spring releases energy. The contact is completed by the mechanical transmission unit. Therefore, the mechanism can also be called a pneumatic one spring operating mechanism.
    The hydraulic operating mechanism is a mechanism that uses hydraulic oil as a power source to complete predetermined motion requirements and realize various functions of the mechanism, and relies on the pumping of the oil pump motor to perform energy storage.
    The hydraulic spring operating mechanism integrates the mechanical energy storage of the spring with the hydraulic drive and control. A spring is used as the energy storage medium and hydraulic oil is used as the transmission medium.
Third, the operating standards
    (1) The position and closing position indicators shall be indicated correctly, and the opening and closing shall be in place.
    (2) The integral fasteners should be free from looseness and falling off.
    (3) There should be no abnormal noise when the energy storage motor is running normally.
    (4) Energy storage components have good energy storage.
    (5) The circuit breaker 's opening and closing coils shall be free from burnt smell, smoke and burns.
    (6) The rotation of the operating mechanism and the transmission part are flexible.
Fourth, the work process
    (1) Preparation
    Multimeter , screwdriver, tape, adjustable wrench, sandpaper, insulating tape (red, black) and replacement parts.
    (2) Treatment method
    1. Rejection or closing speed is low
    (1) The stroke of the closing iron core is small. When the suction is completed, the positioning piece and the roller cannot be unfastened, and the iron core stroke is adjusted.
    (2) The closing operation is performed for a short time, so that the coil is heated and the closing force is reduced.
    (3) The auxiliary switch is not converted or has poor contact. Make adjustments and check the contacts of the auxiliary switch for burns. Replace them with burns.
    (4) The closing spring is permanently deformed and the closing energy is insufficient.
    (5) If the closing coil is broken or burned out, it should be replaced.
    (6) The closing iron core is stuck and should be inspected and adjusted to make it flexible.
    (7) The sector plate is not reset or the clearance to the half shaft is too small (less than 1 mm). The reason is that the opening is not in place or improperly adjusted and should be readjusted.
    (8) The amount of the buckle between the sector plate and the half shaft is too small, and should be adjusted within the range of 2-4mm. If the flange plate and the half shaft are damaged, they should be replaced.
    (9) The heat treatment hardness of the closing positioning member or the roller on the cam is low and there is deformation and should be replaced.
    (10) If the mechanism or the body is stuck, it is necessary to carry out a slow-motion inspection or disintegration inspection to find out the inflexible parts.
    (11) The circuit of the opening circuit is connected, that is, during the closing process, the opening coil has current (the voltage exceeds 30% of the rated operating voltage), and the opening iron core is jacked up. At this time, it should be checked whether the secondary circuit wiring is faulty. And correct the error.
    (12) If the voltage drop of the power supply is too large, the voltage at the closing coil end will not reach the specified value. At this time, the power supply should be adjusted and the lead wire should be thickened.
    (13) The control circuit is not connected. Check the open circuit. If the lead wire at the terminal of the coil is not pressed and the contact is poor, check the problem and perform targeted treatment.
    2. Rejection or opening speed is low
    (1) The half shaft and the sector plate are improperly adjusted, and the buckle amount is too large (the buckle amount should generally be adjusted within the range of 2~4mm).
    (2) The auxiliary switch is not switched or has poor contact. Make adjustments and check the contacts of the auxiliary switch for burns. Replace them with burns.
    (3) If the opening iron core is not completely reset or stuck, check whether there is any blockage in the assembly of the opening electromagnet. If it is necessary, it should be excluded.
    (4) The breaking coil of the opening coil or burnout should be replaced.
    (5) If the parameters of the opening circuit are improperly matched, the voltage at the opening of the winding coil will not reach the specified value and should be readjusted.
    (6) The control loop is not connected, check where the circuit is broken, and then perform the processing.
    (7) There is a jamming phenomenon in the mechanism or the body, which affects the speed of opening. It can be slowly divided or disassembled and reassembled.
    (8) The pre-stretching length of the opening spring is not up to the requirement. The pre-stretching length is adjusted appropriately.
    (9) The opening spring fails and the opening function is insufficient, and the opening spring can be replaced.
    3. The closing spring does not store energy or the energy storage is not in place.
    (1) The automatic air switch that controls the motor should be closed at the “minute†position.
    (2) Check the control circuit for faulty connection, open circuit, poor contact, etc., and should be targeted.
    (3) Contactor contact is poor and should be adjusted.
    (4) The travel switch is cut off too early, it should be adjusted, and check whether the travel switch contacts are burnt out, and burns should be replaced.
    (5) Check the energy storage part of the mechanism, whether there is any jamming, poor cooperation, damage to parts, etc., if any, should be excluded.
Five, matters needing attention
    (1) Before replacing, check if the working power is normal.
    (2) After replacement, check that the replacement parts are working properly.
    (3) During the replacement process, pay attention to personal safety and prevent low-voltage electricity.
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