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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.

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