How is a typical AC distribution board for PV installations different from the DBs used in normal industrial applications ? To find out, here is the latest edition of The Elektro Tipp - Hensel\'s information service for electro-technical specialists.

1. THE ELEKTRO
Customer information for electro-technical specialists 2/2010
Why did the miniature
circuit breakers trip again
already?
The customer wants to set
the plant in operation as
soon as possible!
Dear Reader,
Collection of new ideas in the Electrotechnical Industry
Up to the present time Germany has
been the largest market for photovolta-
ic systems in the world. This situation
will change - in the meantime many
other countries are catching up.
Amongst others the Indian government
has enacted a programme that will
extend the solar energy capacity of the
country to 20,000 megawatts by 2022. I'm confused.
But we installed according
Many electro-technical requirements
to standard installation
are linked with the installation of pho-
practice!
tovoltaic systems - and many mistakes
can be made leading to considerable
“We’ve installed to
damage.
Hensel has many years of experience in
the field of the installation of photo-
voltaic systems - not only on the direct
standard installation
current (DC) but also on the alternating
current (AC) sides.
Make use of our experience in this field;
practice!”
we wish you a successful start in a very
promising growth market of the future.
Yours sincerely
Photovoltaic installations need
98 17 0654 02.10/101/12
F.G. Hensel. different rating.
Managing Director
Gustav Hensel GmbH & Co. KG Why are special solutions needed for nificantly from normal power distribu-
PV plants? tion in buildings in that the installed
devices are subject to a continous
The rating respectively dimensioning
load.
P.S. of photovoltaic installations differs sig-
In Germany, Elektro-Tipp has been
published for more than 25 years – it
appears quarterly and has a fine repu- Installation according to standard installation
tation among the experts. practice won’t work!

2. What is different about photovoltaic installations?
Power distribution Power distribution in
in buildings photovoltaic plants
Protective device Protective device selection and rating to Protective device selection and rating to
selection protect cables related to the current resp. protect cables related to the current resp.
the load of the consumer. load of the solar inverter on the AC side.
�����
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HRC with
������ Surge
����� Miniature
� � �
������
knife link ����������
arrester ���������
circuit breaker
� � �
������� �������� ��������������
����� ������ ������ ������
������ ���
to metering
�� ��
��������������� solar inverter
�����������������
�� ��
Select protective devices, e.g. miniature Select protective devices in the form of a
circuit breakers (MCB) fuse or miniature circuit breaker.
Applying the si- Due to the low simultaneity factor, the PV plants have a simultaneity factor
multaneity factor installed distribution board is often rated of 1!
according to the number of modules. Which is why the distribution boards in
PV plants have to be rated differently and
not simply according to the number of
modules.
������������������
Influenced by In electrical installations, ����������
power loss Constant high loads lead to high average
��������������� of
fluctuates depending on the number power dissipation during the energy
heat from the
simultaneity switched on consumers. production phase.
factor and load
Low average effective power ����
loss Power dissipation therefore needs to be
reduced to the point where the maximum
temperature for devices is not exceeded.
Power loss Pv
������������������ ������������������
Power loss Pv
Ø effective
����������
power loss
���������������
����������
Ø effective
���������������
power loss
time
���� time
����
������������������
Summary:
High power loss levels can lead to exceeding the maximum permit-
����������
ted temperature for devices meaning that protection devices can
���������������
trip even when beneath rated current levels.
����
Photovoltaic installations require a new way of thinking
about rating and device selection!

3. Hensel PV inverter collectors correctly rated
and tested: e.g. circuit-breaker box
PV modules
3. Standard installation benefits
up toDC 1000 V
��� ���
Inverter
��
 Equipment set apart allows for better power loss dissipation.
�� Positioning aids make sure that the installed equipment is
��� automatically set at an appropriate interval.
�� �� �� �� ��
up to AC 500 V
� ���
Power distribution
SPD = Surge protection
device
 At the same time the miniature circuit breaker is installed in
1. Miniature circuit breaker use the right position relative to the protection cover.
 Unskilled persons can use miniature circuit breakers without
any danger as the protection against direct contact always 4. N and PE terminals in separate boxes
remains in place and the device can thus be switched under
load.
 A tripped miniature circuit breaker (MCB) can be recognised
immediately!
2. Assessing simultaneity and load capacity
Your benefit:
 Tested product solutions!
High simultaneity and load:  Standardised installation benefits,
 Devices spaced apart allow a better radiation of the power products provide for tested positioning
dissipation. of miniature circuit breakers (MCB)
 Additional slots assure increased air circulation in the enclo-
sure.
 PV solar inverter collectors are compatible
 The larger enclosure increase the dissipated power loss. with the Hensel Mi system

4. Hensel PV inverter collectors
perfectly rated and tested! DK Cable junction boxes
2
1.5 to 240 mm , IP 54-67
 Complete enclosure sets, not assembled  Protection class: II 
E mail: info@hensel-electric.in · www.hensel.in
 With external brackets for box fixing  Degree of protection: IP 65
Phone: +91-44-2454 - 16 54 / 2669 / 3007
 Cable entry to be ordered separately
KV Small-type distribution
boards
Fax: +91-44-2454 1285 / 4006
3 to 54 modules, IP 54- 65
Distribution boards
Combinable enclosure system
with door up to 250 A, IP 65
Mi Distribution boards
up to 630 A, IP 54-65
Plot 11 to 14 Gandhi Street, Nehru Nagar
Perungudi, Off Old Mahabalipuram Road
Rated capacity 70 kW Rated capacity 140 kW
Incoming: max. 18 x 1~ solar inverters Incoming: Bus-mounted switch disconnector with fuse
Outgoing: switch disconnector, 3-pole 6 x 63 A, 3-pole D02, E 18
Outgoing: switch disconnector 1 x HRC 1, 3-pole
Mi PV 6111 Connection of 1~ solar inverters Cable entry systems
Chennai - 600 096 · INDIA
Mi PV 5123 Connection of 1~ solar inverters
Mi PV 6311 Connection of 3~ solar inverters
Mi PV 5323 Connection of 3~ solar inverters
with surge protection
with surge protection
Mi PV 6211 Connection of 1~ solar inverters
Mi PV 5223 Connection of 1~ solar inverters
Mi PV 6411 Connection of 3~ solar inverters
Construction board panels
Mi PV 5423 Connection of 3~ solar inverters
up to 630 A, IP 44-65
Rated capacity 140 kW
Incoming: max. 36 x 1~ solar inverters
Outgoing: switch disconnector, 3-pole
Mi PV 6123 Connection of 1~ solar inverters
Mi PV 6323 Connection of 3~ solar inverters
Photovoltaik distributors
that meet the standards Industrial Electrical Power Distribution Systems
with surge protection
Mi PV 6223 Connection of 1~ solar inverters Please ask for the new product information
"Safe product solutions conforming to standards
Mi PV 6423 Connection of 3~ solar inverters
for photovoltaic plants" at www.hensel.in!
Hensel Electric India Pvt Ltd
Professional Photovoltaic Distributors
Editorial Office Elektro-Tipp
NEW
10
Safe product solutions
conforming to standards for
PHOTOVOLTAIC
PLANTS
Delivery in India via Hensel authorized
distributor network spanning 130 cities and
industrial centers.
Delivery in South East Asia via Hensel
New Product
information
with the proven
NEW
with exte
nded pro
duct ran
ge
11 R. Rajesh
Managing Director
Hensel Electric India
Pvt Ltd
and tested photo-
authorized distributor network in all ASEAN voltaic solutions Industrial Electrical Power Distribution Systems
info@hensel-electric.in
countries. from Hensel! www.hensel.in