Siemens 3AH Інструкції, монтаж, експлуатація, технічне обслуговування - Сторінка 13

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Також для Siemens 3AH: Експлуатація та технічне обслуговування установки (20 сторінок), Інструкція з експлуатації (38 сторінок)

Interrupter/Operator Description

Elementary Diagram

Figure 8. Typical Elementary Diagram

Rapid Auto-Reclosing

Since the closing spring is automatically recharged by the

motor operating mechanism when the breaker has closed

the operating mechanism is capable of an open-close-open

duty cycle as required for rapid auto-reclosing.

Electrically operated vacuum circuit breakers can be oper-

ated manually if the control supply should fail.

Insert the hand crank (50) in hole (50.1) and turn it clock-

wise (about 45 revolutions) until the indicator (55) shows

"Charged". The hand crank is coupled with the charging

mechanism via an over-running coupling; thus the opera-

tor is not exposed to any risk should the control supply

recover during charging.

Press the close button (53). The close-open indicator (58)

will then display "Closed" and the closing spring condi-

tion indicator will now read "Discharged".

The tripping spring is charged during closing. To open the

breaker, press the trip button (54) and "Open" will be dis-

played by indicator (58).

The indirect release provides for the conversion of mod-

est control signals into powerful mechanical energy im-

pulses. It is primarily used to trip medium voltage circuit

breakers while functioning as a secondary (dual trip) re-

lease or undervoltage release device.

These releases are mechanical energy storage devices.

Their internal springs are charged as a consequence of

the breaker mechanism operation, This energy is released

upon application or removal (as appropriate) of applicable

control voltages. Refer to Figures 9, 10 and 11.

A secondary shunt releases (extra trip coil) is used for elec-

trical tripping of the circuit breaker by protective relays or

manual control devices when more than one trip coil is

required. The second trip coil is generally connected to a

separate auxiliary supply (DC or AC) from the control sup-

ply used for the normal trip coil.