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For a positive sequence network, a bus voltage magnitude must be defined with values in p.u. unit. In this case, bus represents a connection point for balanced three phase lines, loads and generators in a power system.

On the contrary, for the multiphase network, an individual bus voltage magnitude must be defined with values in SI unit for each phase. Here, an individual bus represents a connection point for each phase of the line, load and generator.

A bus may be ‘tripped’ by setting a non-zero value on the ‘trip’ input pin. The result is a disconnection of all two-terminal components attached to the bus, isolating the bus from the rest of the network. The effect of tripping a bus remains permanent for the duration of a simulation.

Bus Parameters

Symbol	Description	Unit
Bus	Bus name (Bus ID) Bus name per phase for multiphase network (Bus ID)	a unique name
Base Voltage (V)	Value for base Voltage	Not applicable
Initial Vmag	Initial value for voltage magnitude of bus (ph-gr RMS)	In positive sequence network: p.u In multiphase network: V
Unit (V, pu)	This column is only used when data is imported via UDB. Use p.u. for transmission systems and V for distribution systems.	-
Angle (deg)	Initial value for voltage angle of bus	Degree
Type	Bus type	PQ, PV, SLACK

Available I/O Pins

No	Pin Description	Pin Type	Value/Unit	Instruction
1	Set/Get trip signal for a bus	I/O	0: Normal 1: Disconnected	busID/trip
2	Get voltage magnitude	O	V or p.u. (RMS)	busID/Vmag
3	Get voltage angle	O	Degree	busID/Vang (Wrapped) busID/VangU (Unwrapped)

Example

See the Bus page in phasor01_IEEE39.xls file in demo PHASOR-01.