PLP Acquires AEM Australia
Preformed Line Products Australia (PLP) is pleased to announce that it has acquired AEM Australia with effect from 1st February 2012.
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Distribution Automation
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The SMCB Ring Main Circuit Breaker is a padmount fully deadfront switch for underground power distribution systems up to 25.8kV and 630A.
For safe and fast operation the design combines puffer load break switches and vacuum fault interrupters, as well as earth switches for every switch combination.
Every bushing has a set of current transformers and voltage sensors, so all electrical values of the connected distribution system can be measured. The switch can also be remotely operated from system control rooms if it is fitted with SCADA-mate control (based on SEL-551 or SEL-501-2 relay) and RTU.
Safety
- Field Proven Vacuum Interrupters ensure safe switch operations and fault levels
- Deadfront design and mechanical cross interlocks between main and earth switches
Reliability
- Field Proven Vacuum Interrupters ensure long operating life
- Unique Field Proven Puffer plus Heavy duty Tulip-Shaped Contacts with arc resistant Cu-W tips ensure a short arc-extinguishing time of less than 0.5 cycles at more than 400 times load current
- The control circuit is powered by an internal power source through an integrated capacitor-potential transformer combination
- Three phase group-operated mechanism delivers a consistent switching speed regardless of operating speed or method (manual or electrical)
- Front ground circuit bushings for easy cable access, installation and testing
- SF6 Gas Insulation enclosed in lifetime sealed stainless steel tank. Less than 0.2% leakage rate per year, with normal insulation and interruption performance even at atmospheric gas pressure
- Fault interrupter Spring charge mechanism ensures rapid Open-Close-Open performance
Electrical Characteristics
| Description | SMCB-16 | SMCB-26 | |
| Maximum System Voltage | 15 Kv | 25.8 kV | |
| Rated Continuous Current | 630 A | 630 A | |
| Electrical Operating Time of CB (Close/Open) Electrical Operating Time of LBS (Close/Open) |
60/25 ms 700 ms each |
60/25 ms 700 ms each |
|
| Minimum Clearing Time of CB | 2.7 cycle | 2.7 cycle | |
| Number of Mechanical Operations of CB Number of Mechanical Operations of LBS Number of Mechanical Operations of Ground |
2,000 times 5,000 times 1,000 times |
2,000 times 5,000 times 1,000 times |
|
| Short Time Withstand Current ( rms) | 20 kA (4 sec) | 12.5 kA (3sec) | |
| Breaking Capacity of LBS |
Mainly Active Load Current | 630 A | 630 A |
| Cable Charging Current Breaking | 25 A | 25 A | |
| Magnetizing Current Breaking | 21 A | 21 A | |
| Line Charging Current Breaking | 1.5 A | 1.5 A | |
| Closed Loop Breaking Current | 630 A | 630 A | |
| Breaking Capacity of CB | 20 kA | 12.5kA | |
| Insulation Level |
Lightning Impulse Withstand Voltage | 95 kV BIL | 125 kV BIL |
| Power Frequency Withstand Voltage | 50 kV | 60 kV | |
| DC Voltage Withstand Voltage | 53 kV | 78 kV | |
| Partial Discharge Extinction Level | 19 kV | 19 kV | |
| Weight without Outer Enclosure | 670 Kg (2CB 2SW) | ||
The SMCB series Ring Main Circuit Breaker is fully certified in accordance with IEC 60265-1, ANSI C37.60 (1981) and ANSI/IEEE C37.71 (1984)
