1 Start up current Stop time Time IA [A] Screw-press I eff. ZAHRA : MWR 324 Relay Start time Start up current Stop time Start time Start up current Stop time Start time Start up current Start time I eff. Start time = 3 sec Stop time = 3 sec example under voltage Over voltage Short current Startup current Maximum current Nominal current- Minimum current - and Effective current 1 Start +Stop
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IA [A] ZAHRA : MWR 324 Relayzahra-gmbh.com/images/electricalenergy6.pdf · ZAHRA : MWR 324 Relay Start time t Stop time Start time t Stop time Start time t Start time I eff. Start
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1
Sta
rt u
p c
urr
en
t
Stop timeTime
IA [A]
Screw-press
I eff.
ZAHRA : MWR 324 Relay
Start time
Sta
rt u
p c
urr
en
t
Stop time
Start time
Sta
rt u
p c
urr
en
t
Stop time
Start time
Sta
rt u
p c
urr
en
t
Start time
I eff.
Start time = 3 sec
Stop time = 3 sec
example
under voltageOver voltage
Short current Startup current Maximum current
Nominal current- Minimum current - and Effective current
1
Start +Stop
2
Lim 2 = Imin
Lim 3 = Imax ( I .t )
75 % IA
tA[sec]
IA
1
234
I0 = Current without load IN = Normal current
5
tA 2
tA 1
1) Start current without load
2) Start current with load
3) Star/Delta current
4) Start current matching
only with ZAHRA relay
5) Fast tripping at blocking ( 0,1 sec.)
ZAHRA
Lim 4 = ( 0,1 Sec )
Lim 1 = IA ( 0,1 Sec )
4 Tripping - limits
2
Inrush time without load
Inrush time with load
Start up current curve
40
0 A
40
0 A
40
0 A
1A
1A
1A
T / M / P
3X 400 / 230 V 50 Hz
700 - 800 Hz 5 - 6 KV
0
1
2
3
مرز جريان اتصال کوتاه
25%
1,5
Iتابع مجذور شدت جريان ضرب در زمان : منحنی قطع2• t ميباشد
Tripping curve : Insrantaneous tripping
20 msec زمان هر پريود
0.1secزمان قطع جريان اتصال اتصال کوتاه
Siemens–ABB–AEG–Telemecanique-Schneider Electric-General Electric– Square D– electric -