Grid Line Inductance - Steca Grid 20000 Installationsanleitung

EN
Line cross section
Max. line length
Note:

4.9 Grid line inductance

For better efficiency, large line cross-sections and single wire cables are increasingly used for
power supply lines, especially if local conditions require long supply lines.
The considerable line lengths between inverter and the transformer station result in a high cable
inductance and therefore an increased line impedance. This presents high resistances for harmon-
ics of the fundamental frequency (50 Hz) of the line voltage and causes voltage distortions in the
inverters as well as error messages with regard to:

controller voltage,

line frequency,

line overvoltage, and

sometimes increased operating noise of the transformers.
To avoid these disadvantageous conditions, twisted lines should be used for power supply if possi-
ble. If laying of twisted lines is not possible, the following requirements must be met for single
cores:

The spacing between single cores may not be too large.

It is not allowed to lay single cores in closed, magnetically conducting materials (e.g., sheet
steel pipe).

If laid in open cable ducts, single cores should be laid such that the spacings between
them are as small as possible.
L3
PE
L1 L2 N

Single cores should not be laid along magnetic materials.
Note:
22
4.0 mm² 6.0 mm²
20 m 30 m
To ensure protection class IP65, the connectors and power supply lines
must be matching each other and all unused connections must be
provided with blanking plugs.
Minimum spacing
between single cores!
The sum total of the ohmic and inductive voltage drops on the power
supply line at nominal load should not exceed 1% of the line voltage. It
must be ensured that the line inductance remains < 30 µH.
10.0 mm²
50 m
748.508 | Z01 | 2013-06-10