The Elektro Tipp

98 1

7 06

54 0

2.10

/101

/12

Installation according to standard installation practice won’t work!

THE ELEKTROCustomer information for electro-technical specialists 2/2010

nificantly from normal power distribu-tion in buildings in that the installed devices are subject to a continous load.

Why are special solutions needed for PV plants?

The rating respectively dimensioning of photovoltaic installations differs sig-

Col

lect

ion

of n

ew id

eas

in th

e E

lect

rote

chni

cal I

ndus

try

Why did the miniature circuit breakers trip again

already? The customer wants to set

the plant in operation as soon as possible!

I'm confused. But we installed according

to standard installation practice!

“We’ve installed to standard installation practice!”Photovoltaic installations need different rating.

Dear Reader,

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.

Many electro-technical requirements are linked with the installation of pho-tovoltaic systems - and many mistakes can be made leading to considerable damage.

Hensel has many years of experience in the field of the installation of photo-voltaic systems - not only on the direct current (DC) but also on the alternating current (AC) sides.

Make use of our experience in this field; we wish you a successful start in a very promising growth market of the future.

Yours sincerely

F.G. Hensel.Managing Director Gustav Hensel GmbH & Co. KG

P.S. In Germany, Elektro-Tipp has been published for more than 25 years – it appears quarterly and has a fine repu-tation among the experts.

Photovoltaic installations require a new way of thinking about rating and device selection!

What is different about photovoltaic installations?Power distribution in buildings

Power distribution in photovoltaic plants

Applying the si-multaneity factor

Due to the low simultaneity factor, the installed distribution board is often rated according to the number of modules.

PV plants have a simultaneity factor of 1!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 heat from the simultaneity factor and load

In electrical installations, power loss fluctuates depending on the number of switched on consumers.

Low average effective power loss

Constant high loads lead to high average power dissipation during the energy production phase.

Power dissipation therefore needs to be reduced to the point where the maximum temperature for devices is not exceeded.

��

��

��

��

��

��

Power loss Pv

Ø effective power loss

time

��

��

��

��

��

��Power loss Pv

Ø effective power loss

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.

Protective device selection

Protective device selection and rating to protect cables related to the current resp. the load of the consumer.

Protective device selection and rating to protect cables related to the current resp. load of the solar inverter on the AC side.

��

��

��

��

�

�

�

�

�

�

��

��

��

��

��

��

��

��

Select protective devices, e.g. miniature circuit breakers (MCB)

Select protective devices in the form of a fuse or miniature circuit breaker.

HRC with knife link

Surge arrester

Miniature circuit breaker

solar inverterto metering

Unskilled persons can use miniature circuit breakers without any danger as the protection against direct contact always remains in place and the device can thus be switched under load.

A tripped miniature circuit breaker (MCB) can be recognised immediately!

1. Miniature circuit breaker use

Hensel PV inverter collectors correctly rated and tested: e.g. circuit-breaker box

4. N and PE terminals in separate boxes

High simultaneity and load:

Devices spaced apart allow a better radiation of the power dissipation.

Additional slots assure increased air circulation in the enclo-sure.

The larger enclosure increase the dissipated power loss.

2. Assessing simultaneity and load capacity

3. Standard installation benefits

Equipment set apart allows for better power loss dissipation. Positioning aids make sure that the installed equipment is automatically set at an appropriate interval.

At the same time the miniature circuit breaker is installed in the right position relative to the protection cover.

Your benefit: Tested product solutions! Standardised installation benefits,

products provide for tested positioning of miniature circuit breakers (MCB)

PV solar inverter collectors are compatible with the Hensel Mi system

up t

o A

C 5

00 V

up t

oD

C 1

000

V

Inverter

SPD = Surge protection device

PV modules

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

Power distribution

Hensel PV inverter collectors perfectly rated and tested! Complete enclosure sets, not assembled With external brackets for box fixing Cable entry to be ordered separately

Protection class: II Degree of protection: IP 65

Rated capacity 70 kWIncoming: Outgoing:

max. 18 x 1~ solar invertersswitch disconnector, 3-pole

Mi PV 6111 Connection of 1~ solar inverters


with surge protection



Rated capacity 140 kWIncoming: Outgoing:

max. 36 x 1~ solar invertersswitch disconnector, 3-pole






Rated capacity 140 kWIncoming:

Outgoing:

Bus-mounted switch disconnector with fuse 6 x 63 A, 3-pole D02, E 18switch disconnector 1 x HRC 1, 3-pole






Hen

sel E

lect

ric In

dia

Pvt

Ltd

P

lot 1

1 to

14

Gan

dhi S

tree

t, N

ehru

Nag

ar

Pho

ne: +

91-4

4-24

54 -

16

54 /

266

9 /

3007

Indu

stria

l Ele

ctric

al P

ower

Dis

trib

utio

n S

yste

ms

Per

ungu

di, O

ff O

ld M

ahab

alip

uram

Roa

d

Fax:

+91

-44-

2454

128

5 /

4006

Edi

toria

l Offi

ce E

lekt

ro-T

ipp

Che

nnai

- 6

00 0

96 ·

IND

IA

E m

ail:

info

@he

nsel

-ele

ctric

.in ·

ww

w.h

ense

l.in

Distribution boardsCombinable enclosure system with door up to 250 A, IP 65

DK Cable junction boxes1.5 to 240 mm

2, IP 54-67

KV Small-type distribution boards3 to 54 modules, IP 54- 65

Mi Distribution boardsup to 630 A, IP 54-65

Cable entry systems

Photovoltaik distributors that meet the standards

Construction board panelsup to 630 A, IP 44-65

R. RajeshManaging Director Hensel Electric India Pvt [email protected]

Delivery in India via Hensel authorized distributor network spanning 130 cities and industrial centers.

Delivery in South East Asia via Hensel authorized distributor network in all ASEAN countries.

1011

Safe product solutions conforming to standards for

PHOTOVOLTAIC PLANTS

Industrial Electrical Power Distribution Systems

NEW

with extended product range

Professional Photovoltaic Distributors

New Product information with the proven and tested photovoltaic solutions from Hensel!

NEW

Please ask for the new product information "Safe product solutions conforming to standards for photovoltaic plants" at www.hensel.in!

The Elektro Tipp

Business

Transcript of The Elektro Tipp