WEG ABW Series, Инструкция по эксплуатации

Страница: 39 / 164

www.weg.net
ABW - Air Circuit Breaker | 39
4.5 FEATURES OF OPERATION
4.5.1 Long delay protection (L)
Protection against overload, with feature of current inverse time.
Figure 4.3: Long delay protection (L).
1. Current Ir
a) Adjustment of range in N and A type units:
(0.4~1.0) xIn
- Iu: (0.5-0.6-0.7-0.8-0.9-1.0) xIn
- Ir: (0.8-0.83-0.85-0.88-0.9-0.93-0.95-0.98-1.0) xIu
b) Adjustment of range in the P and S type units:
(0.4~1.0) xIn
- Ir: (0.4-0.5-0.6-0.7-0.8-0.9-1.0) xIn
2. Performance time tr
- The performance time is based on current of 6xIr
- Adjustment of range: (0.5-1-2-4-8-12- 16-20-Off)s
3. Start of timing
- It occurs when the current exceeds 1.15xIr
4. The unit performs as per the greatest current between the phases R, S, T and the neutral N.
4.5.2 Short delay protection (S)
Protection against short-circuit (timed performance), with feature of inverse time or defined time.
Figure 4.4: Short delay protection (S).
1. Current Isd
- Adjustment of range: (1.5-2-3-4-5-6-8-10-Off) xIr
2. Performance time tr
- The performance time is based on the current of 10xIr
- Adjustment of range for inverse time:
(0.1-0.2-0.3-0.4)s
- Adjustment of range for defined time:
(0.05-0.1-0.2-0.3-0.4)s
3. The unit performs as per the greatest current between the phases R, S, T and the neutral N.
4. The unit can also operate instantaneously by means of the function ZSI.