G59 relay

[normanton]

Good afternoon gents, just wondering if someone could explain to me the need of a G59 relay when using a back up generator. I kind of understand how a G59 relay works, that it open circuits the switch that operates the generator to prevent it sending electricity out to the grid. Also, it is to prevent mains and generator coming into contact, and if so how isn't this an issue with solar PV, which basically does the same thing. Sorry for all the questions, trying to get my head around it. Thank you

 

[Engineer54]

Have you taken any time to read up on the workings of a G59 RELAY??

 

[Knobhead]

Not tried very hard have you?

 

[Lucien Nunes]

Also, it is to prevent mains and generator coming into contact

You're barking up the wrong tree. A G59 relay is designed specifically for energy sources that do run in parallel with the mains, unlike a traditional transfer relay.

 

[shanky887614]

solar pv has to have a voltage into it from the grid before it will export.

this is a safety feature.

thats why if you have a powercut your solar panels do nothing

 

[shanky887614]

You're barking up the wrong tree. A G59 relay is designed specifically for energy sources that do run in parallel with the mains, unlike a traditional transfer relay.

just did a quick google

Why is G59 Protection Needed?
The main reason for the G59 recommendations is to regulate generator applications, so that no generators are connected to the grid without the specific knowledge and permission of the local electricity authority. The principle reason for this is to prevent the embedded generator from sending electricity out onto the National Grid in a dangerous manner:-

For example, let’s say that a cable out in the street has been broken. Along comes the electricity network operator to repair it. They go to the nearest substation and isolate the cable to make it safe to work on. However, in a nearby building is an embedded generator, which suddenly starts up and begins feeding electricity down the other end of the broken cable, making it live. The repair crew would have no knowledge of this, and so would be placed in a potentially fatal situation.

The G59 relay protective device prevents this situation by automatically disconnecting the embedded generator from the mains.

www.connectingindustry.com/ElectricalEngineering/what-is-g59.aspx

 

[Knobhead]

He may be better looking for G83

 

[SPARTYKUS]

solar pv has to have a voltage into it from the grid before it will export.

this is a safety feature.

thats why if you have a powercut your solar panels do nothing

Thyristor.