Power Flow Sign Conventions - ABB RELION 630 Series Technical Manual

Section 7
Power management functions
7.2.1
204

Power flow sign conventions

The power flow sign convention of network circuit breaker in PML630 is considered
positive if the power flow direction is from the lower busbar number to the higher
busbar number (for example, 1...2 or 2...4 or 1...3), else considered negative. The
power flow sign convention in PML630 can be corrected by the settings Send Pow
convention or Rcv Pow convention for sending-end circuit breaker IED or receiving-
end circuit breaker IED respectively in NCBDCSWI, if required.
Table 257 shows the correction for power flow sign convention in PML630 for bus
coupler/tie circuit breaker connected between busbar = 1 and busbar = 2. Similar logic
applies to other instance of network circuit breaker.
Table 257: Power flow sign convention in PML630 IED for network circuit breaker
Power flow sign convention in
sending-/receiving-end CB IED
Bus bar=1 Bus bar =2
OR
Sending end
Bus bar=1
circuit breaker
Receiving end
circuit breaker
Bus bar=2
GUID-16A8EF87-2328-4491-8B32-802A521C4869 V1 EN
Busbar=1 Busbar =2
OR
Sending end
Busbar=1
circuit breaker
Receiving end
circuit breaker
Busbar=2
GUID-52ECA53D-228D-4882-B0C0-C4FCDC850B30 V1 EN
PML630 processes the power values in kW. Hence, sending-end
circuit breaker IED power or receiving-end circuit breaker IED power
units in PML630 can be converted to kW based on the Send Pow
convention or Rcv Pow convention setting respectively. In
"Positive XX" means "Positive W", "Positive kW" or "Positive
MW". See NCBDCSWI for details regarding the power unit
conversion.
The power flow sign convention of the source in PML630 is positive if the power flow
direction is towards the busbar, otherwise it is negative. The power flow sign
convention in PML630 can be corrected with the Power convention setting for the
power source in PSCSWI.
Table 258 shows the correction for power flow sign convention in PML630 for the
power source.
Power flow sign convention in
PML630 IED
Bus bar=1 Bus bar =2
OR
Sending end
Bus bar=1
circuit breaker
Receiving end
circuit breaker
Bus bar=2
GUID-16A8EF87-2328-4491-8B32-802A521C4869 V1 EN
Busbar=1 Busbar =2
OR
Sending end
Busbar=1
circuit breaker
Receiving end
circuit breaker
Busbar=2
GUID-52ECA53D-228D-4882-B0C0-C4FCDC850B30 V1 EN
PML630/Compact Load-Shedding Solution
1MRS757256 F
Send Pow convention or Rcv Pow
convention setting
Positive XX
Negative XX
Table 257,
Technical Manual