operating cycle of h.v circuit breaker 1

[bulancak]

How many open close open ... cycle can achieve a circuit breaker? This cycle changes or not?
As far as i know this cycle is for one charge of motor
open-close-open (three move)
i want to ask if close spring can charge the open spring more than once???

for example without charging with motor, the circuit breaker can have a cycle like this : o-c-o-o-c.....(more than three move)
Pls inform me...

 

[slavag]

Hi.
As you wrote standard cycle is O-C-O only.
Usually, HV CB have only one spring, not close and open spring.
Im not heard about cycle O-C-O-O-C, but you have ask mnf.
Best Regards.
Slava

 

[bulancak]

so how does it work?? ? saw two spring breakers but i cant imagine how single spring circuits operate?
pls inform me
best regards...

 

[oldfieldguy]

Generally (there may be an exception. I've not seen it) spring-operated mechanisms will do O-C-O only.

Hydraulic mechanisms and pneumatic mechanisms generally store enough pressure to do several close and open operations, usually at least three, before the reserve pressure is too low.

old field guy

 

[bulancak]

i ask you about spring mechanisms.For example what is the trend in 154 kV circuit breakers??
They have one or double spring??
and what kinda cycle have they??

 

[jghrist]

For spring operated breakers, there is generally a separate tripping and closing spring. The tripping spring is charged when the breaker is closed. The closing spring is charged by a motor after the breaker is tripped. As indicated by others, the standard is O-C-O, but it is common, at least for MV breakers, to have the ability to reclose multiple times, with enough time to have the motor charge the closing spring.

For example, a Siemens Type SDV-2 has a rated duty cycle of O-0.3S-CO-15S-CO-15S-CO-15S-CO. After the first trip (O), it can close and immediately trip (CO) after a 0.3 second delay. Then it can have three additional reclose/trip operations after a 15 second delay each.

 

[waross]

A common configuration is Close-open. But when closed, the charging motor immediately charges the closing spring so that the breaker is ready for an open-close-open cycle.
A hypothetical breaker that may be closed but not immediately opened is a scary thought.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[TurbineGen]

bulancak, look up ABB's HMA-8 and HMB operating mechanism for single spring operators. They use large ( and I mean really large) bevelled washers as spring. There is a small motor which compresses these via hydraulic oil. The operator simply selects open or close path in the hydraulic circuit and the hydraulic pressure stored by the compressed washers allows for O-C-O-C-O without recharge.

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