Closing and opening energy storage sequence

How does a stored energy design breaker work?

Stored energy design breakers utilize a charging motor to charge a closing spring to a primed position ready to close. A closing coil or manual close button unlatches the closing spring holding latch, which discharges the spring closing the breaker contacts. The complete current carrying assembly is called a phase or pole.

How does a startup sequence work?

In the sequence, the valve starts to open up at the initial time step, and the runners’ rotational speeds gradually increase. The maximum allowed time of the startup sequence is set to 3 s, and five design variables that control the startup sequence are optimised.

What is a closing Spring breaker?

The closing spring provide the energy to close the contacts and is the largest spring on any stored energy breaker. It is sized according to the continuous amperage and interrupting amperage of the breaker. There can be one or two closing springs depending on the type and size of the breaker.

How can we optimise the closing sequence of a wicket gate?

As an example, Rezghi et al. optimised the closing sequence of a wicket gate for a pump-turbine with 1D partial differential flow equations. The closing sequence was divided into a number of time segments, and a genetic algorithm (GA) was applied to minimise the runner over-speed and maximum over-pressure.

Can flow-induced load pulsations be reduced during a transient startup sequence?

The current study has successfully demonstrated an approach for reducing flow-induced load pulsations during a transient startup sequence for a CRPT in pump mode.

What is a breaker closing shaft?

The closing shaft is the device that connects the operating mechanism to the insulated links that operate the moving contacts. The closing shaft has different names depending on the breaker manufacturer: “Main Shaft”. (See Figure 2- 6, Item 12)