Synchronism check

[HamidEle]

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.

 

[DTR2011]

"Voltage difference 104V"

Seems a bit much for a HL/HB.

 

[ScottyUK]

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

 

[DTR2011]

I assumed secondary values.

 

[HamidEle]

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

 

[slavag]

No standards. as usually depend on.

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

 

[krisys]

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.

 

[HamidEle]

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

 

[slavag]

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

 

[stevenal]

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

 

[HamidEle]

There are two buses, A&b

 

[ScottyUK]

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.

 

[HamidEle]

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.