G59 Protection Relay

[adammid]

Can anyone inform me as to what a G59 protection relay is used for and does anyone have an indication of the cost. Many thanks in advance

 

[Technician]

It is a loss of mains protection relay.

Cost?  Shade less than a wedge.

(£1000).

It is necesary when the source of

energy produces a supply that is

in parallel (synched on) to the grid.

It is not necessary in domestic solar

because this is single phase.

 

[adammid]

Many thanks Tech. For clarification they are only required on three phase systems? What if the PV system is single phase, however forms part of a three phase supply ie the main incomer is three phase??

 

[Doc Hudson]

Can anyone inform me as to what a G59 protection relay is used for and does anyone have an indication of the cost. Many thanks in advance

Simple google (or other) search possibly would have given a quicker answer.

http://cclcomponents.com/product.asp?ID=2789

http://www.redcotec.co.uk/grid-connection/g59-protection-relay

http://www.avk-seg.co.uk/seg-power-protection-products

Doc H.

Doc H.

 

[adammid]

I only understand layman terms. many thanks

 

[Doc Hudson]

How about PM our forum sponsor for further info?

http://www.renewablesolutionconsultancy.co.uk/

http://talk.electricianforum.co.uk/user/22218-renewables/

Doc H.

 

[Technician]

As I see it, it would be unwise to connect a single phase

PV array to a three phase system. There would be several

issues, not the least of these would be balancing.

Someone might have other ideas but any source of energy

producing a three phase energy source needs one of these

as protection should mains power be lost for whatever

reason.

The name of the device is from a guidance note on the

connection of energy sources to the grid of less than

50 kW or aggregate of 50kW.

 

[binky]

You can get smallish 3 phase inverters starting at 5kW. if you have 3 phase supply you can install 12kW without talking to DNO, though if you ask nicely they may let you have a bigger system assuming you have the roof space. Some popel also fit 3 small inverters, 1 per phase, but I'm not convinced that they would balance properly.