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Synchronism check

Synchronism check

Synchronism check

(OP)
I am trying to set up a syn check parameters for a bus transfer system. Not sure which standard to go with. It is 4160V system. No generators.
The parameters I entered for now are:
Voltage difference 104V;
Frequency difference 0.25Hz;
Frequency hysteresis 0.1Hz;
Phase angle 10 degree.

I appreciate it in advance.

RE: Synchronism check

"Voltage difference 104V"

Seems a bit much for a HL/HB.

RE: Synchronism check

104V is only 2.5% - why do you think that is excessive?

RE: Synchronism check

I assumed secondary values.

RE: Synchronism check

(OP)
Thank you guys for the responses. Wonder if there is any industry standard, whether IEEE or IEC, to govern this.

RE: Synchronism check

No standards. as usually depend on.

delta U usually : 5-10%
delta Phi 12-15deg.

RE: Synchronism check

For a bus transfer, whose upstream is already paralleled, the setting of delta Phi 12-15deg also appears to be unnecessary. You can have a setting of just 1 or 2 degrees (close to zero). After all it is only for re-affirmation.

RE: Synchronism check

(OP)
Thanks, I may probably change the phase angle delta from 10 to 7 deg.

RE: Synchronism check

Please take in account two buses are not same loaded
7 deg is for generator.

RE: Synchronism check

If no generators are involved, why do you want sync check?

RE: Synchronism check

(OP)
There are two buses, A&b

RE: Synchronism check

Or put another way, is there a credible situation where the two buses may be out of sync? For example, two utility infeeds from separated parts of the transmission or primary distribution system would probably justify it.

RE: Synchronism check

(OP)
Well. There would be way sbove this level, which is 240kV level. But at this voltage level, voltages, phase angles and frequencies should pretty much stay the same.

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