Help for generator

[piter198511]

Hy my Friends
I need help please, we have two generators 1000 kva (G4 and G5) each generator rescues a different use of the other, and we will buy a third generator 1000 kva (G6) to succor one of two group either G4 or G5
if we have a problem in G4, G6 will enter directly supplied to the users (and if we have a problem in G5, G6 is entered) automatic or well manuelleent
I thank you all in advance

 

[waross]

You may need three transfer switches, either manual or automatic.
Call them TS4, TS5, and TS6.
TS6 is connected opposite of the normal connection. A reversing contactor may be used in place of a transfer switch as the normal controls will be replaced.
The output of the generator G6 is connected to what would normally be the output of TS6.
Now the Normal input and the standby input may be used to direct the output of G6 to the standby inputs of TS4 or TS5.
If G4 fails, then TS6 will direct the output of G6 to the standby input of TS4. G6 will now be able to serve the loads normally served by G4 through TS4.
If G5 fails, then TS6 will direct the output of G6 to the standby input of TS5, ready to serve the loads normally served by G5.
TS4 and TS5 may use the supplied controls if these are automatic transfer switches.
You will have to come up with your own control package for TS6. Without having the control diagram for TS6 it is difficult to suggest a control scheme.
Manual transfer switches need no controls.

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

 

[dogzzz]

Hi I am guessing your query and replying
So what I understood there are two existing generators i.e G4 and G5.
If any amongst G4 or G5 goes out G6 will come on board .
Yes this can be achieved by designing an automatic transfer circuit , starting , synching and bringing G6 on line .
This automatic transfer function can work in two ways ,
(i)Remote -Auto === it can automatically sense the ouster of G4 or G5 and bring G6 on line .
(ii) Local Auto === it can sense the ouster of G4 or G5 , but will not take any action and will , you have to go and press Generator(G6) Start button , so
that G6 can be brought on line .

Apart from this , you need to have a purely local Sync operation panel , where you can control the governor of two machines and make them sync
and close the breaker , all by yourself (Local Manual)

Since you said G6 will be bought , thus , please make sure that you have enough interlocks , so that any time three generators
are not on line , due to bus bar short circuit capacity only rated for 2 generators .

Also , in future if you can draw a sketch supporting your query , it would be great .

 

[piter198511]

Hi to all and to all
here is the current pattern so I need more of a descriptive Retailer and schematic if possible
thank you very much for participation and consideration

 

[waross]

Automatic; See my previous post. You will need three additional transfer switches.
Manual; The cheapest, easiest, and simplest is to use two circuit breakers and keyed interlocks. With this system, in the event of a known failure, the breakers may be set so that the standby set will come on in place of the failed set.
If you want the new set to detect a failure of either set and automatically replace it, you will need the three transfer switches.
Which do you want? Manual, simple and partly automatic.
Or
Full automatic, complicated and expensive.

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

 

[piter198511]

Hello sir WAROOS and thank you to the person:
I want my simple manual and automatic part; I also want an explanation diagram of the three switch the engine and how come into work instead of one of the two groups
think you

 

[waross]

Manual will be the simplest and cheapest.
There are a number of firms making keyed interlocks.
The simplest kind is similar to a key operated deadbolt.
These are arranged and mounted to a breaker so that the bolt must be withdrawn before the breaker can be turned on.
The breaker must be turned off and the bolt extended before the key may be removed.
There will be one key for two locks.
The key must be used to withdraw the bolt and turn the breaker on so there may be only one breaker on at a time.
You would connect one breaker in parallel with a generator breaker, say G4. A keyed interlock would be mounted on the generator breaker and a second keyed interlock would be installed on the breaker in parallel. This breaker would be fed from the new generator. In fact it may be the generator breaker, G6.
So the standby side of the transfer switch, TS4, may be fed from either G4, or G6.
A simple switch may direct the engine start signal to G6 instead of G4.
If G4 is out of service, the breakers may be changed and then G6 will operate and supply the loads in place of G4.
The new set may be ordered with two may breakers in parallel and with two keyed interlocks (with different keys) installed on the breakers.
Then you would need to install the paired keyed interlocks on the existing generator breakers, G4 and G5.


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

 

[piter198511]

think you very match Sir waross