HSIOC is also Known as Override Pickup. The trip units used in
ME09 circuit breakers are provided with an override
instantaneous trip:
-- The HSIOC se
ƫ
ng is normally set at 107% of the circuit
breaker Icw ra
Ɵ
ng when the adjustable selec
Ɵ
ve instantaneous
is set to ON.
-- If the adjustable selec
Ɵ
ve instantaneous is set to OFF then the
HSIOC nominal pick up is reduced to 98% of the circuit breaker’s
Icw and, considering tolerance, the minimum pickup reacts at
91% of the circuit breaker’s Icw value.
Every ME09 circuit breaker uses a making current release that is
speci
Į
cally designed to prevent damage to the circuit breaker
when it closed on a fault.
The making current release value varies per circuit breaker
envelope and is related to the circuit breaker’s close and latch
ra
Ɵ
ng as indicated in table 2.7
The MCR pickup is ac
Ɵ
vated at the
Ɵ
me the circuit breaker
closes and for six cycles therea
Ō
er. When the six cycles are over,
the threshold changes to the HSIOC pickup se
ƫ
ng.
2.2.3.3.1
ߛยዃຨ้ԍࢺ
(HSIOC)
2.2.3.3.1 High Set Instantaneous Protec
Ɵ
on (HSIOC)
ITJPD!ᄺྺࡗሜ๔ۯԍࢺăNF1:ୟഗዐ๑ᆩڦۉጱ
ྃ੩ഗದᆶࡗሜຨ้ཌቄԍࢺǖ
..!ۙবስႠຨ้ԍࢺยዃྺ!PODŽഔۯDž้LjITJPD!
ยዃኵཚยዃྺୟഗ!Jdx!ܮۨኵڦ!218&ă
..!සࡕۙবስႠຨ้ԍࢺยዃྺ!PGGDŽ࠲ԿDžLj
ITJPD!Ք๔ۯۉୁইୟഗ!Jdx!ڦ!:9&Lj୯ڟࠅ
ֶLjፌၭ๔ۯۉୁྺୟഗ!Jdx!ኵڦ!:2&ă
߲! NF1:! ୟഗۼದᆶԿࢇۉୁྃ੩ഗLjጎዃጆோย
ऺᆩᇀݞኹୟഗሞࠤቱԿࢇ้ă
߳ዖୟഗॐڪपڦԿࢇۉୁྃ੩ഗยዃኵփཞLjยዃኵ
ᄺᇑୟഗڦԿࢇࢅۨܮۨኵᆶ࠲Ljස!3/8!ዐ๖ă
NDS!๔ۯۉୁሞୟഗԿࢇ!7!߲თ࣍ኮࢫഔۯă7!߲თ࣍
ຐࢫLjពኵ߸߀ྺ!ITJPD!๔ۯۉୁยዃኵă
2.2-04
NF1:ဣଚگუഘୟഗ
֡ፕ
၂๖ೡఇ๕
൸၍
स٪ഗ
Ҿጎ
থ၍
ୟഗ
ॲ
֪
BREAKER
LOCKS
ACCESSORIES
TESTS
APPENDIX
ᆅჾ
ۉጱྃ੩ഗ
INTRO
TRIP UNIT
!
2.7
ǖҾጎڦ!
MCR
!ጎዃतഄยዃ
2.2.3.4
Կࢇۉୁྃ੩ഗ
(MCR)
Table 2.7: Installed MCR devices and their se
ƫ
ngs
2.2.3.4 Making Current Release (MCR)
Ҿጎሞጲۯ႙ยԢዐڦ
MRC
!ጎዃ߁࠵ǖ
ยዃኵ!
(rms)
ॐڪप4
ME 50M to ME 64M
100.000 A
Overview of installed MRC
devices in Automa
Ɵ
c types :
Set value (rms)
Envelope 3
ME 50M to ME 64M
100.000 A
ຫ
ׂ