Power line

Block appearance in REPEAT VISION

 The Power line block is intended for simulation of an overhead orcable line having a U-shaped equivalent circuit. The line equivalent circuit shown below (see Fig. 1) takes into account the following physical phenomena:

• conductor heating and inductance of the line phases with respect to ground(simulated by longitudinal R and X [Ohm], respectively);

• active losses due to corona effect and current leakage through insulators - activeconductivity G [S];

• displacement currents caused by electrostatic field between conductor phasesand ground - capacitive conductivity B [S].

Fig. 1 PTL equivalent circuit

 Depending on the voltage class of the network to which the simulated line belongs,the active and/ or capacitive conductivities may not be taken intoaccount. For this purpose it is enough to specify zero values forthe corresponding parameters.

 The initial data for calculating the parametersof the line equivalent circuit are:

• the length of the line, expressed in [m] or [km];

• active and inductive resistances per unit length, expressed in \( \frac{\mathrm{м}\mathrm{к}\mathrm{С}\mathrm{м}}{м};\frac{\mathrm{м}\mathrm{к}\mathrm{С}\mathrm{м}}{\mathrm{к}\mathrm{м}};\frac{\mathrm{м}\mathrm{к}\mathrm{С}\mathrm{м}}{100\mathrm{к}\mathrm{м}}\)

• active and capacitive conductivities per unit length, expressed in \(\frac{\mathrm{м}\mathrm{к}\mathrm{С}\mathrm{м}}{м};\frac{\mathrm{м}\mathrm{к}\mathrm{С}\mathrm{м}}{\mathrm{к}\mathrm{м}};\frac{\mathrm{м}\mathrm{к}\mathrm{С}\mathrm{м}}{100\mathrm{к}\mathrm{м}}\)

Note

In the next versions it is possible to add calculation of line parametersper unit length depending on the line configuration (conductor cross-section,distance between phases, etc.), as well as simulation of corona lossesand line charging power by setting the corresponding power.

1.  Properties

Property	Default value	Description	Units of measurement
Line length	100	-	-
Length units: m; km	km	-	-
Resistance	0.0365	-	Ohm per unit length
Inductive resistance	0.323	-	Ohm per unit length
Сapacitive susceptance	3.46	-	µS per unit length
Conductance	0.027	-	µS per unit length
Order of magnitude of linear electrical parameter per unit length: m; km; 100km	km	-	-

2.  Inputs and outputs

Parameters	Input/Output	Description	Units of measurement	Port type
Input	Input	-	-	Electrocity
Voltage at the end of the power line	Output	-	V	Electrocity

In order to see the connection capabilities of the block, you need to go to page Description of block ports