MMS is a metal-enclosed, double busbar, air-insulated switchgear system with vacuum interrupters and can be used in applications up to 24 kV. Using modular circuit breaker and bus-coupler panels ensures maximum flexibility, while the double busbar installation provides continuous electrical energy supply. This makes MMS an ideal energy distribution application via main stations in heavy industry, where uptime and uninterrupted power supply are critical.
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The expected lifetime of switchgear is between 30 and 40 years depending on the environment and the operation of the plant. Thereby, the maintenance costs represent an important factor in the calculation of the overall costs of the switchgear.
MMS excels here with its "fit and forget" approach, which means that all primary parts are maintenance-free for life. Likewise, the disconnector and circuit-breaker mechanisms do not need maintenance for the first decade. Since the mechanisms are easily accessible through the secondary compartment, the required maintenance time and costs are reduced to a minimum.
An MMS double busbar installation offers more than just optimal availability. Compared with single busbar and duplex medium voltage switchgear systems, it is also the best investment choice:
“Our customers highly value the reliability and safety of Eaton’s MMS medium voltage double busbar system. This is a high-end system offering full remote operation and control for the electrical grid. MMS maximizes power uptime by offering changeover between busbars without interruption and the unique feature of switchgear extension under live service condition.”
An MMS system is easy to automate. This system is ideally suited to an automated environment and there is obviously a preference for international standards such as the open control and communication protocol in accordance with IEC 60870.
MMS can always be integrated into an existing automated environment as well. As an independent partner, Eaton will be pleased to advise you on any matter, whether it will be refurbishment or expansion of an existing sub-station. We will be happy to submit a tender for the entire project.
The MMS system can be read out and operated without any problems using SCADA systems. MMS also offers great flexibility with respect to protection relay manufacturers. The equipment you prefer can be integrated without any difficulty. The system is also suitable for both serial field bus systems and conventional wiring methods.
Double busbar installation | Rated voltage (kV) | Nominal current (A) | H (mm) | W (mm) | D (mm)* | Weight per panel (kg) |
Outgoing (incoming cable feeder panel) |
24 | up to 800 | 2570 | 600 | 2165-2480* | 725 |
24 | 1250-2000 | 2570 | 600 | 2165-2730* | 1100 | |
17.5 | 3150 | 2570 | 1000 | 2330-2730* | 1500 | |
Sectionalizer panel | 24 | max. 2000 | 2570 | 1400 | 2350-2500 | 2000 |
17.5 | 3150 | 2570 | 4000 | 2350-2500 | 1300 | |
Buscoupler panel | 24 | max. 2000 | 2570 | 1000 | 2350-2500 | 1600 |
17.5 | 2500 | 2570 | 2000 | 2350-2500 | 1300 | |
17.5 | 3150 | 2570 | 2000 | 2350-2500 | 1500 |
Rated voltage | kV | 12 | 17.5 | 24 |
---|---|---|---|---|
Lightning impulse withstand voltage | kV | 75 | 95 | 125 |
Power frequency withstand voltage | kV-1m | 28 | 38 | 50 |
Rated frequency | Hz | 50 - 60 | 50 - 60 | 50 - 60 |
Protection factor | IP | 3XD | 3XD | 3XD |
Arc resistance 0.5s (optional 1s) | kA | 31.5 | 31.5 | 25 |
Rated voltage | 12 | 17.5 | 24 | |
---|---|---|---|---|
Rated current | A | 2000/3150 | 2000/3150 | 2000 |
Rated short-term withstand current | kA-s | 31.5-3 | 31.5-3 | 25-3 |
Rated peak withstand current | kA | 80 | 80 | 63 |
Rated voltage | 12 | 17.5 | 24 | |
---|---|---|---|---|
Rated current | A | 3150 | 3150 | 3150 |
Rated short-term withstand current | kA-s | 31.5-3 | 31.5-3 | 25-3 |
Rated breaking current | kA | 31.5 | 31.5 | 25 |
DC component | 35% | 35% | 35% | |
Rated short-circuit making current | kA | 80 | 80 | 63 |