Catalogo Solare 1.0.pdf - Alta
Catalogo Solare 1.0.pdf - Alta
Catalogo Solare 1.0.pdf - Alta
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Isolation Measurement PV Converter<br />
Application Note AN10-1AG<br />
Application<br />
The photovoltaic construction have to isolate across<br />
earth very well. Currents which based on bad isolation<br />
cause to high contact risk and additional power loss.<br />
The complete isolation resistance is made up of<br />
different components:<br />
PV-Module<br />
<br />
<br />
DC-Cable<br />
Converter<br />
Converters without an internal transformer are not<br />
galvanically isolated from the power net. As per DIN<br />
VDE 0126-1-1 it´s not allowed to go below a limit<br />
isolation resistance between the converter and the<br />
power net.<br />
Based on the missing galvanic isolation a continued<br />
measuring of the isolation resistance during the<br />
converter is running is not possible. Therefore the<br />
isolation resistance is measured before the converter is<br />
connected to the power net (current sensitive fault<br />
protection).<br />
Products<br />
Modern converters contain a integrated isolation<br />
control. This control system check all components of<br />
the photovoltaic construction of isolation failure. This<br />
control system has high requirements on the<br />
assembled<br />
relay.’<br />
Reed Relays from MEDER perfectly fulfill such<br />
requirements. The Reed Technology makes it possible<br />
to reach isolation resistance >10G Ohm. Another<br />
advantage is the low power consumption. Reed Relays<br />
only need energy during the switching process which<br />
has a positive influence of the overall efficiency of the<br />
converter. The high amount of 10 9 switching cycles<br />
makes the Reed Relays suitable for long life<br />
applications.<br />
Series<br />
Dimensions<br />
Contact Configuration<br />
LI 1 Form A –<br />
Normally Open<br />
BE 1 Form A –<br />
Normally Open<br />
KT 1 Form A –<br />
Normally Open<br />
Dimension<br />
L x W x H<br />
(mm)<br />
30x10x10.4<br />
33x10x10<br />
30x12.5x13.1<br />
Operating Characteristics<br />
Series<br />
Coil Isolation Switching Isolation Switching Carry<br />
Voltage Voltage Voltage Resistance Current Current<br />
Power<br />
V(DC) Max (VDC) Max (VDC) Max (Ω) Max (A) Max (A) Max (W)<br />
LI 5,12,24 4,000 1,000 >10G 1,0 5 100<br />
BE 5,12,24 4,000 1,000 >10G 1,0 2,5 100<br />
KT 5,12,24 8,000 1,000 >10G 1,0 1,0 100<br />
MEDER electronic • www.meder.com Page 1<br />
MEDER electronic Inc., USA • Tel.: +1 508 295 0771 • Email: salesusa@meder.com<br />
www.meder.com
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