11KV Sf6 Ring Main Unit
As one of the leading manufacturers of SF6 ring main unit manufacturers, Orecco focusing on providing the medium voltage RMU unit ranging from 11kV to 33kV.
11KV sf6 ring main unit(rmu) for secondary distribution network was designed by Orecco with the advantages of uninterrupted power supply. The function of ring main unit is to ensure the power supply that when the main source of power shutdown, the second source could be feed immediately.
Ring6 ring main unit is sf6 insulated, which is one of the safest types of ring main unit in the market. As an option, Ring6 can be delivered as extendable ring main unit, it could be called extendable compact ring main unit. 11KV/24KV Ring main unit can be supplied in 10 different configurations suitable for most switching applications in 11KV/24KV power distribution networks.
There is three types of ring main unit in the market: Gas insulated rmu, air-insulated rmu, solid insulated rmu. It is used to divide the load current, break the short-circuit current and the no-load current of the transformer, and to control the charging current of overhead lines and cable lines from a certain distance. It is an important switchgear for ring power supply and terminal power supply.
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The features of 11kV sf6 ring main unit
Ring6 is a totally sealed system with a stainless steel tank containing all of the live components and switching functions. This constant stable atmospheric condition and sf6 gas inside of the tank could ensure the high-level reliability and safety for the operator, it’s designed for the purpose of 30 years maintenance-free.
The ring main unit is a group of high-voltage switchgear installed in the metal cabinet of the steel plate or assembled into a ring-shaped ring power supply unit. The core part of the equipment is a load switch and a fuse.
It has a simple structure, small size, and low price. Improve the power supply parameters and performance and power supply security. It is widely used in power distribution stations and box-type substations in load centers such as urban residential quarters, high-rise buildings, large-scale public buildings, and factory enterprises.
Ring main unit types
The ring network cabinet is generally divided into three types of air insulation, solid insulation, and SF6 insulation.
It is used to split load current, break short-circuit current and transformer no-load current, to control and protect the charging current of overhead lines and cable lines. It is an important switch equipment for ring network power supply and terminal power supply.
Advantages of ring main unit
There are five advantages for ring main unit totally:
1, outdoor, fully insulated, fully sealed structure, can adapt to any harsh environment.
2, visible fracture, confirm the position of switch contacts, ensure the safety of personnel.
3, small size, lightweight, compact structure, small footprint.
4, simple installation, easy operation, safety, and reliability, maintenance free.
5 and three work linkage structure to effectively prevent equipment defects from running.
To sum up, the loop cabinet is characterized by safety, reliability, lightweight, compact structure, simple installation, convenient operation and suitable for all kinds of harsh environments.
Ring main unit working principle
The working principle of ring main unit is that the power supply trunk forms a closed ring, and the power supply supplies power to the ring trunk and then distributes power from the trunk line all the way through the high voltage switch. The advantage of this is that each distribution branch can take power from its left trunk and its trunk from the right.
When the left mainline fails, it continues to receive power from the right mainline. When the right main line fails, it continues to receive power from the left mainline.
This way, although the main power supply is single-circuit powered, However, similar to the two-way power supply, benefits are obtained from each distribution branch, which improves the reliability of the power supply.
The advantages of 11kv sf6 ring main unit
1.Prevent misuse and effectively protect people and equipment
When the load switch is closed, the isolating switch is automatically closed first; the load switch and the grounding switch also have strict mechanical interlocking and electrical interlocking, so that the structure firstly ensures that the two are unlikely to be malfunctioned, that is, when the load switch is closed In the position, it is impossible to perform the closing operation of the grounding switch.
Similarly, when the grounding switch is in the closed position, it is impossible to perform the closing operation of the load switch; once the front door of the 11kv sf6 ring main unit is opened, the load switch can no longer be closed, thus effectively Prevents the occurrence of misoperations.
2. High-performance indicators. Vacuum and SF6 load switches used in vacuum ring network cabinets and 11kv SF6 ring main unit are frequently operated. The number of “combined-minute” rated active loads can reach 100 times, which is for gas-generating and gas-pressure load switches. More than 10 times the load switch, and has a good breaking capacity, the short-time withstand current is generally 20kA, and the short-circuiting current can generally reach 50kA.
3. Easy maintenance. The 11kv sf6 ring main unit in the high and low voltage complete sets of equipment are generally installed in the power distribution room, which avoids the dangers such as vehicle collision, human damage, flooding and water in the ring network cable branch box. The indoor operation and maintenance will also bring the weather to the weather.
The impact of the operation is minimized. The clear panel design of the cabinet surface makes the wiring pattern marked on the counter surface in the form of a simulation diagram, which makes it clear at a glance. Some manufacturers’ 11kv sf6 ring main unit also indicates the operation instructions and precautions on the cabinet surface, further reducing the operator’s mistakes.
The possibility of operation; most products are equipped with a live display device that can monitor the live state of the main circuit, which not only can indicate the high-voltage charging condition but also can cooperate with the electromagnetic lock to realize the forced locking of the handle door to improve the anti-missing performance; the transparent installation in the front door The plexiglass observation window can directly check the opening and closing state of the load switch.
4. Flexible use, easy to expand. With the increase of operating experience, the expandable ring main unit is gradually replacing the former fully enclosed ring network cabinet; with the advancement of compact design, modular splicing, etc., the configuration of the 11kv sf6 ring main unit is now very flexible.
Meet the requirements of various design schemes, realize any combination according to the actual needs of customers; the connection mode of cable trays is also more flexible, even in the case that the ground is not flat enough, soft connection can be realized, and partial discharge will not occur; installation equipment The automation interface prepares for the construction of distribution automation.
| Ring6 11KV/24KV | C-module | F-module | v-module | ||||
| Switch disconnector | Earthing switch | Switch-fuse disconnector | Downstream earthing switch | Vacuum circuit-breaker | Earthing switch/ disconnector | ||
| Rated voltage | kV | 12/17, 5/24 | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 | 12/17,5/24 |
| Rated frequency 5) | Hz | 50/50/50 | 50/50/50 | 50/50/50 | 50/5 0/50 | 50/50/50 | 50/50/50 |
| Power frequency withstand voltage | kV | 284)/38/50 | 284)/38 /50 | 284,/38 /50 | 284,/38 /50 | 284)/38/50 | 284)/38/50 |
| Lightning impulse withstand voitage | kV | 95/95/125 | 95/95/125 | 95/95/125 | 95/95/125 | 95/95/125 | 95/95/125 |
| Rated normai current | A | 6 30/630/630 | 2001) | 200/200/200 | |||
| Breaking capacities: | |||||||
| -active load | A | 630/630/630 | |||||
| -closed loop | A | 650/650/650 | |||||
| -offload cable charging | A | 140/140/140 | |||||
| -offload transformer | A | 20/20/20 | |||||
| -earth-fault | A | 205/160/160 | |||||
| -earth-fault cable charging | A | 117/91/91 | |||||
| -short-circuit breaking current | kA | see2) | 16/16/16 | ||||
| Marking capacity | kA | 52,5/40/40 | 52,5/40/40 | see2) 5 | 12,5/12,5/12, | 40/40/40 | 40/40/40 |
| Short tirne current 3 sec,3) | kA | 21/16/16 | 21/16/16 | 16/16/16 | 16/16/16 | ||
1) Depending on the current rating of the fuse-link
2) Limited by high voltage fuse-links
3) Maximum rating for bushings Interface C (400 series bolted)
4) GOST version is available with 42kV power frequency to withstand voltage
5) For rated frequency 60Hz de-rating for current parameter needs to be applied
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