AegisEcoTec Ring Main Unit
A breath of fresh air for electrical distribution.
The new AegisEcoTec Ring Main Unit (RMU) uses synthetic air, not SF6 as the insulating medium, bringing environmental advantages for medium voltage (MV) switchgear.
The AegisEcoTec non-SF6 Ring Main Unit (RMU) range is designed to be smaller and more efficient, while maintaining compatibility with standard installation requirements. As a result, the EcoTec range provides the same set of solutions for substations as conventional equivalents, but in a more compact and optimised package.
Across the Aegis range, operator safety is paramount with integral interlocking at the forefront of its innovative mechanism design. With a clear, unambiguous mimic and 100% padlockable human-machine interface (HMI), this solution is straightforward and secure.
To ensure the high industrial and operational reliability NZ’s networks need, AegisEcoTec 12kV non-SF6 RMUs use the same core mechanism design as the hugely successful Aegis RMU range which is installed worldwide.
AegisEcoTec non-SF6 RMU uses synthetic air bringing environmental advantages for medium voltage (MV) switchgear. For load break switching, a new architecture is necessary.
AegisEcoTec non-SF6 RMU uses a small load break vacuum interrupter (VI) shunted across the main current-carrying contacts. This shunt VI breaks the load current, ensuring there is no arcing of the main current-carrying contacts.
AegisEcoTec | Width (mm) | Depth (mm) | Height (mm) |
2-way | 720 | 704 | 1669 |
3-way | 1060 | 704 | 1669 |
4-way | 1400 | 704 | 1669 |
Parameters | Specifications | 12kV |
Rated voltage | kV | 12 |
Rated frequency | Hz | 50 |
Rated impulse withstand voltage | kV | 95 |
Rated power frequency withstand voltage | kV | 38 |
Short time withstand current | kA | 20 |
Rated duration of short circuit | Seconds | 3 |
Short peak withstand current | kA | 52.5 |
Internal arc classification |
| AF/AFL/AFLR |
Internal arc rating: Tank | kA 1 second | 20 |
Cable Box | kA 1 second | 13.5 / 20 |
Ingress protection: Outdoor | IP | 54 |
Indoor | IP | 41 |
Temperature range | °C | -25 to +40 |
Maximum relative humidity | % | 95 |
Circuit Breaker Functions
Parameters | Specifications | 12kV |
Rated normal current: T function | A | 250 |
V function | A | 630 |
Mechanical endurance | Class | M1 |
Electrical endurance | Class | E2 |
Load Break Functions
Parameters | Specifications | 12kV |
Rated normal current | A | 630 |
Mechanical endurance | Class | M1 |
Electrical endurance | Class | E3 |
Other literature available on request
Reports, drawings, technical data sheets, installation instructions, O&M guidelines
