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Wiring Riddle No.3 - Auto-transfer switching control diagram
I need an auto-transfer switching control diagram for use in main-emergency power supply system. Can anyone advise me?
Author : Alireza
 
#1
Tue, July 13th, 2010 - 15:08
You can refer to Changeover device to DIN VDE 0108 – Power systems and safety power supply in buildings.



Main switch Q1 is closed first, followed by main switch Q1.1 (auxiliary supply).
Phase monitor K1 is energized via the main supply and immediately energizes contactor relay K2. Normally closed contact K2/21–22 blocks the circuit. Contactor Q12 (auxiliary supply) and normally open contact K2/13-14 closes the circuit of contactor Q11, which energizes and switches the mains supply on the load. Contactor Q12 is also interlocked against mains supply contactor Q11 via normally closed contact Q11/22-21.
 
Author : Hamid - From: Iran- Firouzabad in Fars
 
#2
Sat, March 3rd, 2012 - 21:28
good day sir                                                                                                            
Can i use a contactor to connect automatic changeover transfer switch? 
Author : buchio - From: nigeria
 
#3
Sun, March 4th, 2012 - 16:39
Yes, Q11 and Q12 in above circuit diagrm are contactor. 
Author : Hamid - From: Iran - Firoozabad Fars
 
#4
Sat, August 18th, 2012 - 06:52
Hi,,,
I Have Gen-set and would like make a ATS between Main line and generator, so I would like to send me a simple Diagram and colored pictures for each item and how connected them by diagram wires.
Thanks too much
 
Author : Abdussalam
 
#5
Sat, March 9th, 2013 - 11:30
Hello all,

I want to use this electrical diagram to design some electrical panels. Thank you for this simple and good diagram. I will add also two delay relays to connect the main/ the generator delayed.

I have one question, appreciate if you can help me.
I will use this ATS to feed 3-phase loads but also 1-phase loads. How can we connect the single phase loads to the neutral and earth? If we connect the loads to both neutrals/N and earth/PE (mains+auxiliar) this means we connect the main N to the auxiliary N and main PE to the auxiliary PE . Is this correct and safe to do?
Connecting the main and auxiliary in parallel is not allowed but to connect the N and PE in parallel is allowed?
Another idea would be to use 4-pole contactors (to disconnect also the neutral) but unfortunately our approved supplier have only 3-pole contactors.
 
Author : Alex - From: romania
 
#6
Sat, March 9th, 2013 - 18:45
Generally in electrical system with multiple neutral-to-ground connections, (e.g. the main and Standby/Emergency power supplies) the neutrals of the two systems must be separated to assure proper ground fault current sensing. When the separated ground fault in two systems is mandatory, the incomplete sensing and nuisance tripping can be eliminated by 4 Pole transfer switch application, which will also classify the Standby/Emergency supply as a separately derived system.
On the other hand some standards such as Canadian Electrical Code does not require, nor is it general practice to provide additional ground fault protection where the essential loads are energized from a separately derived power system, such as an engine-driven generator set. However according to some recommendation no ground fault protection is applied to any emergency system where the capacity of a generator is 500 kW or less.
This is a trade-off in possible electrical equipment damage, in order to keep the essential circuits in operation, as decided by an operator. Therefore if individual ground fault protection is your concern you shall use 4 pole transfer switch for suitable neutral/ground separations.
 
Author : Hamid - From: Iran
 
#7
Wed, April 10th, 2013 - 12:28
this is wonderful explantory 
Author : mbale joseph - From: zambia
 
#8
Tue, May 14th, 2013 - 19:57
hello everybody,
i want a wiring diagram of changeover(3 phases)with 2 incoming
schema power & schema control 
Author : kavi - From: Mauritius
 
#9
Tue, August 6th, 2013 - 13:37
Thanks, enjoying the above knowledge 
Author : Agaba Michael - From: Ugandan
 
#10
Sun, October 20th, 2013 - 14:34
tks for yr nice knewlogh 
#11
Sat, April 5th, 2014 - 15:09
Hello all.

I want three phase automatic change over switch for AC agriculture motor.
I have three phase three wire utility power supply and Three phase VFD solar drive.  
Author : B Praveen Rao - From: India
 
#12
Sat, April 5th, 2014 - 16:44
Sir please send me ATSelectrical  connection diagram  generator and local power supply 
Author : hameed - From: indian
 
#13
Mon, April 28th, 2014 - 11:06
Hi Dear
i like your wonder full explanation keep it up
I Have Dessile generator and would like make a ATS between Main line and generator, so I would like to send me a simple Diagram and colored pictures for each item and how connected them by diagram wires.
I Thanks too much
 
Author : abera maru - From: Ethiopian
 
#14
Tue, July 15th, 2014 - 02:53
Hello sir,                                                                                                                                                    I will appreciate if u can help me with circuit diagram, with contactors, ac relay, dc relay , seconds timer, hours timer that automatically changeover to auxilliary and main source , and can also start/ stop the generator without torching the circuit manually,, sir I will very much sir, pls clear and explainable diagram thanks. 
Author : Jatto Joshua - From: nigeria
 
#15
Sat, July 19th, 2014 - 00:46
Please refer to below simple diagram.

 
Author : Hamid - From: Iran
 
#16
Sat, July 19th, 2014 - 10:41
Pl.change the name of f2 is over load relay/ current setting relay.
This is a quite good circuit. 
#17
Mon, February 16th, 2015 - 18:16
I used a similar circuit in a cubicle design and I have been asked for my colleagues to remove one relay that performs the crossed interlock between the contactors.
Regarding the first circuit in the thread: Is there any reason I should keep Q12 N/C auxiliary contact in the circuit that energizes Q11 coil? Apparently the use of N/O and N/C contacts of K2 would prevent both coils to be energized at the same time. 
Author : Alfredo - From: UK
 
#18
Tue, February 17th, 2015 - 11:10
It is considered for safe interlock against any contactors manual operation via dip switch that provided for alternative operation on magnetic relays. Also it is an additional safety for overcome to some cases such as K2 failure and so on. 
Author : Hamid - From: Iran
 
#19
Tue, March 17th, 2015 - 13:36
Hi
why is it that generator power are not good for some machines? 
Author : Asante - From: Ghana
 
#20
Mon, May 25th, 2015 - 19:47
PLEASE HOW CAN I USE A 3POLE RELAY THAT HAS L1, L2 AND L3, WITH T1, T2 AND T3 AS A CHANGEOVER SWITCH FOR A SINGLE PHASE POWER INPUT FROM GRID AND A SINGLE PHASE POWER INPUT FROM GENERATOR? PLEASE EXPLAIN TO ME WITH CIRCUIT DIAGRAM AND SCHEMATICS. AM REALLY GRATEFUL FOR YOUR HELP AND KNOWLEDGE SHARING TO US. YOU CAN MAIL ME ON ekehemmanuelchijioke@gmail, with the needed response. i await ur kind reply 
Author : EKEH EMMQNUEL - From: NIGERIA
 
#21
Tue, May 26th, 2015 - 06:59
Same logic could be used as below diagram.

 
Author : Hamid - From: Iran
 
#22
Mon, June 1st, 2015 - 17:53
I need a diagram for the generator to start when general power supply goes off  
#23
Sun, June 14th, 2015 - 11:59
hi
i need a simple diagram of automatic changeover between generator supply &electricity supply.
thanks. 
Author : Joseph mwanyasi - From: kenya
 
#24
Tue, July 21st, 2015 - 09:38
Dear all     i have 800A  usage  but we dont have ATS.pls send full automatically drawing  electrical &control.(we use ABB   or  seimens brand)     Thanks best regard     NUWAN 
Author : Nuwan sanjeewa - From: Srilanka
 
#25
Tue, July 21st, 2015 - 17:58
Hi
I need a simple labelled diagram for an automatic change over. And automatic switching ON/OFF of genset 
Author : Mwewa Bukankala - From: Zambia
 
#26
Tue, September 15th, 2015 - 14:08
I need a simple levelled diagram for  an automatic change over switchlng from main to gen and automatic switching off on gen set 
Author : afolabi - From: nigerian
 
#27
Sun, December 6th, 2015 - 01:29
Tanks alot but I need  a diagram dat could control up 500 kva,and two generator tuning alternatively on hourly arrangement.
I will be graceful to get this idea from you.thanks
My regards to you 
Author : ifeanyi young - From: nigeria
 
#28
Mon, December 7th, 2015 - 10:44
you can refer to schneider electric 2001 catalog:

Source-changeover systems
for circuit breakers and
switch-disconnectors
40 to 5000 A
 
Author : Hamid - From: Iran
 
#29
Sat, January 16th, 2016 - 18:12
Hi Dear
Excellent your technical teaching.

I Have a Photovoltaic (P.V) off grid system of 2 phases and neutral ( 2 inversors)  and would like make a ATS between P.V System (principal) and Main line (auxiliar), so I would like to send me a simple Diagram.

Transferencia


GOD bless you.  
Author : Francis Child - From: Colombia
 
#30
Fri, March 18th, 2016 - 21:39
Good day sir! Pls I need your help on how to build a remote control for a lightning point.thanks 
Author : Teemos - From: Nigerian
 
#31
Mon, April 11th, 2016 - 18:35
Hello sir may you help me the circuit diagram of an autochangeover using contactors, timer relay, relay, phase failure and a PLC 
Author : zakayo - From: tanzanian
 
#32
Thu, June 16th, 2016 - 17:20
circuit diagram using an auto changeover switch using contactors sources of supply are solar and mains
 
Author : Shoorai Chahwanda - From: Zimbabwe
 
#33
Thu, July 14th, 2016 - 17:58
Hello.. I need control circuit for star delta its timer will be take 220-240v.. Contacotor 380-415v.. 
#34
Thu, July 21st, 2016 - 10:43
 
Author : Hamid - From: Iran
 
#35
Wed, August 10th, 2016 - 17:29
Pls how can I use only power to make an automatic change over switch using timers, contactors, relays. And nt to involve electronics. Pls I nid an explanation with a schematic diagram. Tnx.  
Author : Akuroseokika P Odia - From: Nigeria
 
#36
Thu, August 11th, 2016 - 10:16
You can refer to answer no.1 
Author : Hamid - From: Iran
 
#37
Fri, January 6th, 2017 - 21:52
Dear sir,

I have a diesel generator with deepsea 5110 module, I need ATS panel diagram! I have 2 magnetic contractor, 2 AC relays, 2 timers, one phase monitering relay. .waiting for your kind response.
Thankx  
Author : Adnan - From: Pakistan
 
#38
Fri, January 13th, 2017 - 09:06
dear sir,  i humble your help;
i have a three phase 440v ac generator as the main supply and i want to connect a single phase 20kva ac generator as an auxiliary for air conditioners, base radios and lighting systems once the main engine is off.
  so how i can use diesel on and diesel off relays and contactors to connect them automatically as a change over switch when the main diesel engine 400v ac is off???????
         
Author : theophil william - From: tanzanian
 
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