DEMA 400 Series User Manual

43
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Universal Formula for Reset Curves
4.3.1.1 IEC Inverse Time Protection Curves
-3, Electrical relays - Part 3:

standard defines the following protection curves.
1. IEC Short Time Inverse: IEC STI.
2. IEC Standard Inverse: IEC SI.
3. IEC Very Inverse: IEC VI.
4. IEC Extremely Inverse: IEC EI.
5. IEC Long Time Inverse: IEC LTI.
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Universal trip time delay formula is given above, while IEC constants for various curves are
given on the below table.
t Trip delay (s).
A A constant for the characteristic (s).
I Momentary current (A).
Is Set current threshold (A).
-).
B A constant for the characteristic (s).
Açıklama Kısaltma A
α (Açma
Faktörü)
B
Tres
α (Reset
Faktörü)
C Reset Tipi
Short Time Inverse
Kısa Zamanlı Ters
IEC STI 0.05 s 0.04 0 TMS 0.025-3.2 - - - DMT (0.04-100) s DMT
IEC
Standard Inverse
Normal Ters
IEC SI 0.14 s 0.02 0 TMS 0.025-3.2 - - - DMT (0.04-100) s DMT
IEC
Very Inverse
Çok Ters
IEC VI 13.5 s 1 0 TMS 0.025-3.2 - - - DMT (0.04-100) s DMT
IEC
Extremely Inverse
Aşırı Ters
IEC EI 80 s 2 0 TMS 0.025-3.2 - - - DMT (0.04-100) s DMT
IEC
Long Time Inverse
Uzun Zamanlı Ters
IEC LTI 120 s 1 0 TMS 0.025-3.2 - - - DMT (0.04-100) s DMT
IEC
Semiconductor Protection
Yarıiletken Koruma
SA Semic 35500 s 6 0 TMS 0.025-3.2 - - - DMT (0.04-100) s DMT
Özel Eğri SA
Definite Inverse (DI)
Özel Sabite Yakın Ters (DI)
SB DI 2.96875 s 2.3 1.96875 s TMS 0.025-3.2 - - - DMT (0.04-100) s DMT
Özel Eğri SB
- - - DMT (0.04-100) s DMT
6.9 2 0 RTMS 0.025-3.2 IDMT
- - - DMT (0.04-100) s DMT
39.6 2 0 RTMS 0.025-3.2 IDMT
- - - DMT (0.04-100) s DMT
2.2 2 0 RTMS 0.025-3.2 IDMT
- - - DMT (0.04-100) s DMT
4.85 2 0 RTMS 0.025-3.2 IDMT
- - - DMT (0.04-100) s DMT
21.6 2 0 RTMS 0.025-3.2 IDMT
- - - DMT (0.04-100) s DMT
29.1 2 0 RTMS 0.025-3.2 IDMT
Definite Minimum Time
Sabit Zaman
DMT - - - DMT 0.01-150s - - - DMT (0.04-100) s DMT
-
Thermal Overload
Termik Aşırı Yük
IEC
IEC Koruma Eğrileri
bölümünde incelenmiştir.
Ayar Aralığı
0.025-3.2
0.025-3.2
0.025-3.2
0.025-3.2
0.025-3.2
0.025-3.2
1.05
0.68 s
TMS
0.02
0.114 s
TMS
SE CO-C3H
IEEE MI
19.61 s
28.2 s
SD CO8
IEEE / ANSI
2
0.491 s
TMS
2
0.1217 s
TMS
Özel Eğri SD
Özel Eğri SE
IEEE / ANSI
IEEE / ANSI
Very Inverse
Çok Ters
Extremely Inverse
Aşırı Ters
Reset Eğrisi Parametreleri
Ayar Aralığı
2
0.72 s
TMS
Short Time Inverse (CO2)
Özel Kısa Zamanlı Ters (CO2)
Long Time Inverse (SD CO8)
Özel Uzun Zamanlı Ters (SD CO8)
TMS
0.008 s
0.02
0.0092 s
SC CO2
IEEE VI
IEEE EI
Uygulanan
Standart
Koruma Eğrisi Parametreleri
Eğri Tipi
Standard Inverse (CO-C3H)
Özel Normal Ters (CO-C3H)
Moderately Inverse
Ilımlı Ters
21 s
1.81 s
0.0515 s
Özel Eğri SC

DEMA 400 Series Specifications

General

Brand	DEMA
Model	400 Series
Category	Relays
Language	English