Vacuum interrupter/ operator
When a tripping command is given, the energy stored in the tripping- and contact- pressure springs is released by pawl (64.2). The opening sequence is similar to the closing sequence. The residual force of the tripping spring arrests the moving contact (36.0) in the OPEN (TRIPPED) position.
Operating mechanism
The operating mechanism is comprised of the mechanical and electrical components required to:
1.Charge the closing springs with sufficient potential energy to close the circuit breaker and to store opening energy in the tripping- and contact- pressure springs.
2.Means to initiate closing and tripping actions.
3.Means of transmitting force and motion to each of three poles.
4.Operate all of these functions automatically through electrical- charging motor, cutout switches, anti- pump relay, release (close and trip) solenoids and auxiliary switches.
5.Provide indication of the circuit breaker status (OPEN/CLOSED), spring condition (CHARGED/DISCHARGED) and number of operations.
Construction
The essential parts of the operating mechanism are shown in Figure 15:
Indirect releases (tripping coils)
The shunt releases (54.1) convert the
The undervoltage release (optional) (54.2) may be electrically actuated by a make or a break contact.
If a make contact is used, the coil is shorted out, and a resistor must be used to limit the current. The
Motor-operating mechanism
The
Auxiliary switch
The auxiliary switch (68.0) is actuated by the jack shaft (63.0) and link (68.1).
Mode of operation
The operating mechanism is of the stored- energy
When the
Charging
The details of the
Fitted to it are the crank (62.2) at one end, and the cam (62.3), together with lever (62.5) at the other.
When the charging mechanism is actuated by hand with a hand crank or by a motor (50.4), the flange (50.3) turns until the driver (50.3.1) locates in the cutaway part of the cam disc (62.3), thus causing the charging shaft to follow. The crank (62.2) charges the closing spring (62.0).
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