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shunt trip并联跳闸装置

(2012-01-25 10:34:34)
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shunt

trip

杂谈

分类: EI_Elements
shunt <wbr>trip并联跳闸装置A shunt trip breaker is intended to provide the capability to open the breaker on conditions other than the over-current profile designed into the breaker. It's a cheap and handy way to provide remote or emergency shut-downs, load shedding, etc.
A shunt trip circuit breaker is just a low voltage molded case circuit breaker fitted with an extra trip solenoid to allow external control logic trip the breaker.

The standard molded case circuit breaker does not have any means for an external control or protection system to trip the breaker, other than via the operator handle. The shunt trip solenoid plunger pushes activates the mechanical trip release, just like the internal thermal and/or magnetic protection units in the breaker cause it to trip.
The shunt trip circuit breaker DOES NOT connect the circuit to earth to somehow clear a fault.
 

It works just like a normal circuit breaker with one additional function. A shunt-trip breaker also has a built-in magnetic coil that can be energized externally to trip the breaker.

For instance, fire sprinklers are sometimes required in the top of elevator shafts in case of a fire in the shaft. If the sprinklers were to spray water on the electric controls in the elevator cab, people could be hurt or killed, either from electrocution or from the elevator malfunctioning. In these cases, a shunt-trip breaker is installed in the circuit feeding the elevator controls, and the fire alarm system sends a trip signal if it detects waterflow from the sprinkler system. This trips the breaker and removes power from the elevator cab. Once tripped, shunt-trip breakers require a person to manually reset them.

 

The shunt trip device consists of a coil in series with a limit switch. when the circuit breaker contacts are closed, the limit switch is closed. Depressing a custormer-supplier pushbutton energizes the shunt trip coil, causing the breaker's mechanical latch to disengage the trip mechanism and opening the circuit breaker's contacts. When the contacts open, the limit switch is also opened, removing power from the coil. As with any trip, the breaker must be reset manually.

 

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