Kriel power station trips, taking 2,000MW with it

[mojoman]

Yep they forced to use it so that Cyril can have his speech hehe

Ja...cant have Squirrel talking wubbish with the lights off....

 

[Lupus]

Yep they forced to use it so that Cyril can have his speech hehe

Actually don't think so, they have had family meetings with load shedding before, this was done as load shedding can be more costly than the OCTG running costs, remember their primary aim is to actually keep the lights on.

 

[Pak Fa Fui]

Are you serious?
A trip switch is a fuse...

But you understand that load this size will arc and put a piece back in ain't possible

If an unit trips, it is not like flipping a switch. First need to find the reason, fix. Then it means cleaning up the furnace, getting new coal in. Starting the furnace, waiting for temp to come up, and turbines to get back up-to speed.

So if one trips it take 5 units with it, you got no failsafe, surge protection, anything
Can see why it breaks so often if people like you want to defend it

 

[WalkWithMe]

So if one trips it take 5 units with it, you got no failsafe, surge protection, anything
Can see why it breaks so often if people like you want to defend it

The trips were chain reaction, which someone else pointed out a plausible reason.

Load protection is how the trips happened, this is basic electronics/electricity 101. Nothing to defend here, just how it works.

I never said Eskom is right or wrong here.

Your idea of a physical fuse is not practical, cheap or something that happens to be replaced in seconds.

 

[R13...]

If an unit trips, it is not like flipping a switch. First need to find the reason, fix. Then it means cleaning up the furnace, getting new coal in. Starting the furnace, waiting for temp to come up, and turbines to get back up-to speed.

Depends on what tripped and why. A unit trip doesn't necessarily mean every part of that unit has tripped. A unit might trip but you keep the boiler up and just vent the steam if you don't think it'll take too long to get everything started up again.

The only trip that takes out all the major equipment is a boiler trip. And then turbine would take out the gen, the gen takes out the main transformer, etc.

 

[wingnut771]

Depends on what tripped and why. A unit trip doesn't necessarily mean every part of that unit has tripped. A unit might trip but you keep the boiler up and just vent the steam if you don't think it'll take too long to get everything started up again.

The only trip that takes out all the major equipment is a boiler trip. And then turbine would take out the gen, the gen takes out the main transformer, etc.

If the substation outside blows up because no one cleaned the insulators, then that would trip all the generators as there is nowhere for the power to go.

 

[R13...]

If the substation outside blows up because no one cleaned the insulators, then that would trip all the generators as there is nowhere for the power to go.

Which substation?

 

[wingnut771]

Which substation?

The one for the power station. How do you think the power gets from the generator to your plug?

 

[R13...]

The one for the power station. How do you think the power gets from the generator to your plug?

It goes from a generator, gets stepped up by a huge transformer. Then sent to a switching yard, onto a pair of HV transmission line, then another switching yard on the other hand. Distribution substations (may kms away), then local distribution. I still don't see a substation that trips a power station in that system.

 

[wingnut771]

It goes from a generator, gets stepped up by a huge transformer. Then sent to a switching yard, onto a pair of HV transmission line, then another switching yard on the other hand. Distribution substations (may kms away), then local distribution. I still don't see a substation that trips a power station in that system.

This is what I'm calling a substation. If sparks fly there, all generators will trip.

 

[R13...]

This is what I'm calling a substation. If sparks fly there, all generators will trip.

No. Each unit has its own generator so one of those tripping doesn't trip the entire station.

 

[wingnut771]

No. Each unit has its own generator so one of those tripping doesn't trip the entire station.

Each generator has its own switching yard?

 

[R13...]

Each generator has its own switching yard?

Stop shifting goal posts. Maybe rather go read up on this stuff. A switching yard doesn't trip an entire station, it is redundant

 

[wingnut771]

Stop shifting goal posts. Maybe rather go read up on this stuff. A switching yard doesn't trip an entire station, it is redundant

Ok, what tripped all 6 generators?

 

[R13...]

Ok, what tripped all 6 generators?
View attachment 1354892

I don't know what tripped it. Eskom don't publish details of their RCAs. There's common equipment that can trip a station but you'd need to be at the power station as part of the investigation to know cause of trip. And your pic yes shows a switch yard but that thing is redundant I think it works in units of 2/3.