ABB Ring Main Unit sf6
ABB Ring Main Unit sf6
ABB Ring Main Unit sf6
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SF6 insulated Ring Main Units and Compact Switchgear SafeRing and SafePlus
ABB offers a complete solution for 12/24 kV distribution networks. This consists of SafeRing, a Ring Main Unit (RMU) that can be supplied in various configurations and SafePlus, a compact switchgear with unique flexibility. SafePlus offers extendibility and fully / semi modular configuration possibilities. Both the units have identical user interfaces. SafeRing / SafePlus are delivered as a completely sealed system with a stainless steel tank containing all the live parts and the switching equipment. Constant atmospheric conditions in the sealed tank ensures a high level of reliability, safety and a virtually maintenance-free system. As an option in SafePlus, an external busbar can be provided to enable a completely modular configuration. SafeRing and SafePlus can also be fitted with a remote control and monitoring unit and are suitable for both indoor and outdoor applications.
Key features
Compact and robust design Minimal moving parts Virtually maintenance free High degree of functionality with integrated features High flexibility Multiple configuration options Enhanced safety Complete solutions including applications for remote control and monitoring
Applications
City power distribution, hotels, shopping centres, office buildings, business centres, etc.
Small industries
Wind turbines
Monitoring of SF6 gas pressure/density Additional equipment that can be supplied includes Direct Process Interface (DPI) board for: Monitoring of current on the high voltage side with ring core transformers and Monitoring of current and voltage on the low voltage side of the distribution transformer. (Power Quality Monitoring)
Communication
The unit can be equipped with different types of communication media. External communication such as radio and GSM is connected via an RS232 interface.
Fuses
When switch fuse combinations are used for transformer protection, the fuse canisters are positioned behind a separately interlocked cover in front of the unit. To facilitate fuse replacement, the operating handle is used to remove the fuse canister covers. The fuse tripping system is located at the front, ensuring a waterproof solution.
Arc suppressor
As an option the units can be supplied with an arc suppressor which closes automatically on the feeder bushings if an internal arc fault occurs.
Cable connections
The units are fitted with standardised bushings that comply with DIN 47636. All the bushings are the same height from the ground and are protected by a cable cover. The cable covers are supplied with an interlocking mechanism with the earthing switches. It is also possible to connect parallel cables with a special double cable cover. Cable covers are designed to accommodate both single core and three core cables.
Transformer protection
A choice is offered between a switch fuse combination and circuit breaker with relay for transformer protection. The switch fuse combination offers optimal protection against short circuits, while the circuit breaker with relay option offers better protection against low overcurrents. A circuit breaker with relay is recommended for larger transformers.
Key interlocking
As an option the units can be supplied with a key interlocking system for circuit breakers, switches and earthing switches.
Technical specifications
C- module Switch disconnector Rated voltage kV 12 / 17,5 / 24 28 / 38 / 50 95 / 95 / 125 630 / 630 / 630
F- module
V- module
Downstream Vacuum circuit earthing switch breaker Earthing switch 12/15,2/17,5/24 28 / 38 / 38 / 50 12/15,2/17,5/24 28 / 38 / 38 / 50
12 / 17,5 / 24 12 / 17,5 / 24 28 / 38 / 50 28 / 38 / 50
Power frequency withstand voltage kV Impulse withstand voltage Rated current Breaking capacities: closed loop of load cable charging of load transformer earth fault earth fault cable charging short circuit breaking current Making capacity Short time current 1 sec. Short time current 3 sec. A A A A A kA kA kA kA kV A
630 / 630 / 630 135 / 135 / 135 20 / 20 / 20 200 / 150 / 150 115 / 87 / 87 Ver2) 62,5 / 52,5 / 52,5 25 / - / 21 / 21 / 21 62,5 / 52,5 / 52,5 Ver2) 25 / - / 21 / 21 / 21 12,5 / 12,5 / 12,5 5/5/5 21 / 21 / 16 / 16 21 / 21 / 16 / 16 21 / 21 / 16 / 16 52,5/52,5/40/40 52,5/52,5/40/40
SafeRing and SafePlus are tested according to IEC publications IEC 60265, IEC 60129, IEC 60056, IEC 60420, IEC 60694 and IEC 60298.
Optional equipment
Busbar extension LHS/RHS External busbar Metering LV compartment Manometer and signal (1 NO) from pressure indicator wired to terminals Voltage tester Auxiliary switch for vacuum circuit breaker position 2 NO + 2NC Auxiliary switch for disconnected position 2NO + 2NC Auxiliary switch for earth switch position 2NO + 2NC Vacuum circuit breaker tripped signal 1NO Short circuit indicator Auxiliary switch for load break switch position 2NO + 2NC Auxiliary switch for fuse blown 1NO Cable test bushings Cable support bars, non-magnetic Extra base frame (h=450 mm) Ronis interlocking system, EL 11 AP Current measuring Arc suppressor Integrated control and monitoring Trip coil open Trip coil open and close Motorised operation Capacitive voltage indicator
DV
CCV
CCCC
CCCV
CCVV
Be
Sl*
Sv**
* Busrise needed when Sl on right side of SF6 tank ** Sv always together with Busrise (Total width=650 mm) C F D De Cable Switch Switch fuse disconnector Direct cable connection Direct cable connection with earthing V Vacuum circuit breaker S1 Busbar sectionaliser, load break switch Be Busbar earthing Sv Busbar sectionaliser, vacuum circuit breaker M Metering cubicle
Dimensional drawing
* NB Fixing bracket
All products are manufactured in accordance with ISO9001. The latest edition of relevant IEC standards will always apply to our continuous test programme. SafeRing/SafePlus are designed for highest levels of personal safety and type tested for internal arc as per IEC standards.
ABB Limited operates a process of continuous product development. We therefore reserve the right to change designs, dimensions and data without prior notice.
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