Testing Automatic Transfer Switch
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- Опубліковано 8 сер 2022
- Kohler 20KW standby generator with 200 amp transfer switch. Testing the system by turning off the main disconnect to house power. The generator activates and the transfer switch engages within about 5 seconds, powering every circuit on the emergency panel. One surprise was how long it took (5+ minutes, edited out of the video) for the transfer switch to flip back over to utility power once restored.
- Наука та технологія
I can think of 3 reasons why you want a certain delay between mains power coming back, and switching from generator to mains power:
- It's best to let the generator run for a bit longer, so water produced by the combustion process does not linger in the exhaust system and rot it out. To reach full operating temperature, the generator needs more time, but at least the exhaust system will be hot enough for the water to evaporate. It also helps recharge the starter battery.
- You want to avoid turning off and restarting the generator multiple times in a row (going through darkness each time), when a recloser trips 3 times before locking out.
- For the grid as a whole, it's beneficial if it doesn't go from 0 to 100% load instantly. If all mains connections would be brought online staggered, it would mean there's a lot lower inrush current.
Gotta say, i am a low voltage electrical guy, not a high voltage guy, so i have no idea if there are things that are super obvious to the high or mains voltage guys, that i'm not seeing.
Huh, an ITE disconnect and panel. Don't see many of those since Siemens took over
Great video demo! Just be careful doing a disconnect under high amps, could blow due to arc flash, so step to the side away from the door blowing out is what arc flash protocol calls for.
For a demo, good to lower the amps
Thank you! I did make sure the A/C systems were off before opening the main disconnect. Lighting was pretty much the only thing on at the time.
The long runtime after switching to land power is a cooling time for the genset to run without load , usually 90 to 120 second, of course considered the size of genset you have. But if 200 Amp supply is sufficient i guess your genset to be a smaller size, so that would be the usual cooling time.
Switching to emergency power should normally take no more than 6 to 8 seconds, safetime to get the genset and oilpressure up running full speed before switching to prevent any harmfull surges to the alternator.
How much kW is your electrical service? Those are some big boy fuses in that disconnect switch.
Do you have a electrical fence I heard snaps in the back ground
No, that's the auto relight module for the furnace. Apparently the previous owners had an issue with the pilot going out and had that installed years ago.
@@owenperkins can you do a update on your central vacuum system last video I have seen you had a MD
@@cyberlight22 I can do that! Might wait until I get the Retract Vac installed for the garage.
What a mess