synchronizer question 1

[Sn00ze]

If the C60 can do synch check. ie: compare both sides of the breaker and then close the breaker when appropriate. why would you use an external synchronizer like a beckwith m-0193?

 

[catserveng]

A sync check is a permissive device, allows a breaker close if voltage, frequency and phase are within allowed tolerances. An automatic synchronizer is a controlling device, with outputs to raise and lower speed and volts to bring a unit into "sync" then issue a breaker close command.

MikeL.

 

[Prot123]

C60 is a passive synch device(not a synchronizer but synch check device). It doesn't control generator for synching. It just compares the parameters on either side of breaker and when all is within the set value it will issue a close command. This is called passive synch. Now the active synch/ synchronizer is a device which will control the generator parameter so that it syncs. This is the reason we may need an external synchronizer.

 

[edison123]

With synch check only, you need to close the breaker.

With auto synchronizer, the breaker control is taken away from your trembling hand and your palpitating heart.

Muthu

http://www.edison.co.in

 

[davidbeach]

You want synchronization in one device and synch check in a different device. One puts it there and the other verifies that it's really there. Just synch check and you may wait an infinitely long time for the conditions to be just right. Just synchronization and ... what happens in there's and accidental phase shift, or a worse problem? Belts and suspenders are a good start...

 

[Sn00ze]

thank you for your replies,

but then let me ask you this. How come it works on just about every site i've seen? Just the C60 i mean.

 

[waross]

The sync check is there to prevent a disaster in case it doesn't work.
It's sometimes called a second level of protection.

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

 

[bacon4life]

A sync check has a somewhat wide window that is intended to prevent catastrophic damage from a single closing event. A synchronizer aims for a zero degree angle to minimize transients. Closing in at 10 degrees out probably won't hurt if you do it once, but for repeated starts having a zero angle is a lot better for long term reliability.

 

[davidbeach]

How the heck do you think you get within the C60 window?

 

[edison123]

@OP - No one here said that it won't work with sync check relay alone. You need to read the answers.

Muthu

http://www.edison.co.in

 

[catserveng]

You started with a pretty general question and then wanted to apply answers to your systems without providing details. Maybe if you could provide information on the types of systems you're dealing with you could get a better answer.

If you are dealing with two sources that are frequency and voltage stable, and in phase, then a sync check by itself is probably ok. If you are paralleling a generator to a stable and reliable source, then an automatic synchronizer may not be needed. If you're trying to sync a smaller machine to an active bus, then likely you will also need the capabilities of a control that can change the speed and voltage of the oncoming machine to make it parallel properly.

But based on the info you provided so far, you're really only going to get general answers.

If you want to get some more info on the topic, look at chapter 7 of the attached.

MikeL