Well, if you (or your client) don't care about the measuring being wrong then I don't understand your issue.
Assuming of course you don't have any directional protection (pure over current IOC and TOC; these protection functions don't care about the voltage/angle)
But not quite sure what ratio...
A diagram says more than 1000 words...please draw one.
If the disconnect terminals should be open or closed depends on where in the circuit they are located.
"In addition, the phase of the power is not correct in your calculations. Use the difference of the phases of voltage and current, not their sum."
This is why you have to use the conjugate of the current, but you always add the angles.
(22A @ 20 degrees)*=22A @-20 degrees
You wrote that VLL = √3 x VLN. Well, there's you fundamental error.
The correct way of putting it should be:
|VLL| = √3 x |VLN|.
See what I'm aming at?
Example:
VLN= 230V∠0º
VLL= 400V∠30º
You stated that "VLL = √3 x VLN":
"400V∠30º" = √3 x 230V∠0º, as you can see this is not correct...
Hmm, sorry for my previous reply, thick fingers on a small keyboard is what caused that...
Any how;
S=VLN x IL ∠∅
Where VLN=Line to neutral voltage
IL=Line current
∅=Angle between line to neutral voltage and line current
The 3-phase apparent power is;
S3P=3 x VLN x IL ∠∅
As you stated we can...
Oops, I totally forgot about this thread...
I haven't checked the connection via ethernet Cable, but I know that a Dsub9F-Dsub9F serial cable will work.
I can't remember if it's a strait or a null modem Cable I use - need to check this.
Kind regards,
SB
Usually the battery manufacturer will define a "end voltage". Discharging the battery below this point will probably cause damage to the battery.
If you discharge the battery way below this pint you'll not be able to charge it to full capacity again.
Does the relay protect the primary side of the transformer also?
With such a low ratio CT you need to check if the CT will saturate on a primary fault.
Hi Tony,
Hmm, if I'm not misstaken you should actually enter the settings for ethernet connection in two separate menues/setting lists. I'm not sure, but I'll check this on Monday.
Cheers,
/SB
Hi,
You can use the Ethernet port, take a look in section 3.5.5 in the "Configuration Tool Manual" found here: Link
You could also use the electrical RS232 port to communicate with the IED.
/SB
"1 - voltage on the secondary 'a' terminal leads the voltage on the primary 'A' terminal by 30° phase shift."
Shouldn't it be "lags" instead of "leads"? The HV 'A' phase leads the LV 'a' phase.
