1, the nature of the operating energy According to the nature of the operating energy of the substation, the operating mechanism of the circuit breaker can choose the following forms

(1) Electromagnetic operating mechanism.

(2) Spring control mechanism

(3) Hydraulic control mechanism.

(4) Pneumatic control mechanism. For the newly built and expanded substations of industrial and mining enterprises, manual control mechanisms should no longer be used.

2, the control mode of the operating mechanism should meet the actual operating conditions

3, operating voltage Operating mechanism tripping coil terminal operating voltage should meet the following conditions

(1) When it is less than 30% of the rated voltage, it should not act;

(2) When it is higher than 65% of the rated voltage, it should be operated reliably.

4, closing power supply for the use of electromagnetic mechanism control mode, the closing power supply has the following requirements:

(1) In any operating condition, the power supply during the closing process should remain stable.

(2) If the power supply voltage changes during operation, when the closing coil is energized, the terminal voltage should not be lower than 80% of the rated voltage (when the rated short-circuit closing current is greater than or equal to 50kA, not less than 85% of the rated voltage), and the maximum should not be higher than 110% of the rated voltage.

(3) When the DC system operation wiring mode changes (such as DC power supply maintenance to take temporary measures and ring bus open-loop operation, etc.); The above requirements for voltage changes should also be met.

5, the air source pressure when the pneumatic mechanism is used, the pressure of the air source of the closing compressed air is basically stable, and the general change amplitude is not more than ±kPa.

6, with the "first pressure slow division" device hydraulic control mechanism and the pneumatic mechanism using the principle of differential pressure should have an anti-" first pressure slow division "device, the so-called" first pressure slow division "means that the hydraulic operating mechanism for some reason pressure to zero, and then restart the oil pump pressure, will cause the circuit breaker slow opening.

7, the working pressure using hydraulic or pneumatic mechanism, when the working pressure is greater than 1MPa, there is a pressure safety release device.

8, dust, moisture and ventilation and other circuit breaker operating mechanisms should have dust, moisture, small animal entry and ventilation measures, hydraulic and pneumatic mechanisms should have heating devices and constant temperature control measures.