Scribd
Upload
51 views1 page

Fig. J25: 2Yhuyrowdjhfdwhjru/Rihtxlsphqw

This document discusses the design of electrical installation protection systems. It describes four overvoltage categories for equipment: Category I is for electronic equipment where protective means are outside the equipment; Category II is for household appliances; Category III is for distribution boards and wiring systems downstream of the main board; and Category IV is for equipment near the origin of the installation, like meters. It also discusses achieving an installed overvoltage protection level Up by comparing the SPD protection level to the loads' withstand capability and taking a safety margin for overvoltages in the installation.

Uploaded by

mahmoud12122012
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
51 views1 page

Fig. J25: 2Yhuyrowdjhfdwhjru/Rihtxlsphqw

This document discusses the design of electrical installation protection systems. It describes four overvoltage categories for equipment: Category I is for electronic equipment where protective means are outside the equipment; Category II is for household appliances; Category III is for distribution boards and wiring systems downstream of the main board; and Category IV is for equipment near the origin of the installation, like meters. It also discusses achieving an installed overvoltage protection level Up by comparing the SPD protection level to the loads' withstand capability and taking a safety margin for overvoltages in the installation.

Uploaded by

mahmoud12122012
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 1

3 Design of the electrical

installation protection system

b(TXLSPHQWRIRYHUYROWDJHFDWHJRU\,LV
RQO\VXLWDEOHIRUXVHLQWKH¿[HGLQVWDOODWLRQRI
EXLOGLQJVZKHUHSURWHFWLYHPHDQVDUHDSSOLHG
RXWVLGHWKHHTXLSPHQW±WROLPLWWUDQVLHQW
RYHUYROWDJHVWRWKHVSHFL¿HGOHYHO
([DPSOHVRIVXFKHTXLSPHQWDUHWKRVH
FRQWDLQLQJHOHFWURQLFFLUFXLWVOLNHFRPSXWHUV
DSSOLDQFHVZLWKHOHFWURQLFSURJUDPPHVHWF
b(TXLSPHQWRIRYHUYROWDJHFDWHJRU\,,LV
VXLWDEOHIRUFRQQHFWLRQWRWKH¿[HGHOHFWULFDO
LQVWDOODWLRQSURYLGLQJDQRUPDOGHJUHHRI
DYDLODELOLW\QRUPDOO\UHTXLUHGIRUFXUUHQWXVLQJ
HTXLSPHQW
([DPSOHVRIVXFKHTXLSPHQWDUHKRXVHKROG
DSSOLDQFHVDQGVLPLODUORDGV
b(TXLSPHQWRIRYHUYROWDJHFDWHJRU\,,,LVIRU
XVHLQWKH¿[HGLQVWDOODWLRQGRZQVWUHDPRI
DQGLQFOXGLQJWKHPDLQGLVWULEXWLRQERDUG
SURYLGLQJDKLJKGHJUHHRIDYDLODELOLW\
([DPSOHVRIVXFKHTXLSPHQWDUHGLVWULEXWLRQ
ERDUGVFLUFXLWEUHDNHUVZLULQJV\VWHPV
LQFOXGLQJFDEOHVEXVEDUVMXQFWLRQER[HV
VZLWFKHVVRFNHWRXWOHWV LQWKH¿[HG
LQVWDOODWLRQDQGHTXLSPHQWIRULQGXVWULDOXVH
DQGVRPHRWKHUHTXLSPHQWHJVWDWLRQDU\
PRWRUVZLWKSHUPDQHQWFRQQHFWLRQWRWKH
¿[HGLQVWDOODWLRQ
b(TXLSPHQWRIRYHUYROWDJHFDWHJRU\,9LV
VXLWDEOHIRUXVHDWRULQWKHSUR[LPLW\RI
WKHRULJLQRIWKHLQVWDOODWLRQIRUH[DPSOH
XSVWUHDPRIWKHPDLQGLVWULEXWLRQERDUG
([DPSOHVRIVXFKHTXLSPHQWDUHHOHFWULFLW\ J17
PHWHUVSULPDU\RYHUFXUUHQWSURWHFWLRQ
GHYLFHVDQGULSSOHFRQWUROXQLWV

Fig. J25 2YHUYROWDJHFDWHJRU\RIHTXLSPHQW

7KHLQVWDOOHG8SSHUIRUPDQFHVKRXOGEHFRPSDUHGZLWKWKHLPSXOVHZLWKVWDQG
FDSDELOLW\RIWKHORDGV
63'KDVDYROWDJHSURWHFWLRQOHYHO8SWKDWLVLQWULQVLFLHGH¿QHGDQGWHVWHG
LQGHSHQGHQWO\RILWVLQVWDOODWLRQ,QSUDFWLFHIRUWKHFKRLFHRI8SSHUIRUPDQFHRID
63'DVDIHW\PDUJLQPXVWEHWDNHQWRDOORZIRUWKHRYHUYROWDJHVLQKHUHQWLQWKH
LQVWDOODWLRQRIWKH63' VHH)LJ-DQG† 

8

/RDGV
,QVWDOOHG
8S WREH 8S88
8S
SURWHFWHG

8
© Schneider Electric - all rights reserved

Fig. J26 ,QVWDOOHG8S

7KHLQVWDOOHGYROWDJHSURWHFWLRQOHYHO8SJHQHUDOO\DGRSWHGWRSURWHFWVHQVLWLYH
HTXLSPHQWLQ9HOHFWULFDOLQVWDOODWLRQVLVN9 RYHUYROWDJHFDWHJRU\,,
VHHFig. J27 
1RWH
,IWKHVWLSXODWHGYROWDJHSURWHFWLRQOHYHOFDQQRWEHDFKLHYHG
E\WKHLQFRPLQJHQG63'RULIVHQVLWLYHHTXLSPHQWLWHPVDUH
UHPRWH VHHVHFWLRQ DGGLWLRQDOFRRUGLQDWHG63'PXVW
EHLQVWDOOHGWRDFKLHYHWKHUHTXLUHGSURWHFWLRQOHYHO

You might also like