In an electrical power distribution system, a ring main unit rmu is a factory assembled, metal enclosed set of switchgear used at the load connection points of a ringtype distribution network. What is a ring main unit in electrical power distribution. The ring main unit, also known as the ring network power supply unit, is a set of highvoltage switchgear installed in a steel plate metal cabinet or made into a modular compartment the core part uses load switches and fuses. A complete switchgear means, assembly of required switching devices, protection device as well as metering device. The switchgear is provided in several versions suitable for a. Pdf en 1224kv saferingsafeplus gas insulated ring main unit and compact switchgear. Safeplus is abbs flexible, extendable compact switchgear. The ring main units at different substations are connected together to form the ring and contain a switch that connects a transformer or other equipment in. It also includes a protection device and a metering device. The extended unit has a separatetank from the main unit. Medium voltage switchgear devices and transformers for zone 1. Rmu of different voltage mostly 12 kv and 24 kv and current ratings are. The extension transforms the rmu tobecome a 4way or a 5way respectively.
The ring main unit is an innovative solution that makes it easier to manage the numerous challenges of electrical distribution. Unit must be equipped with arc proof cable covers distance from floor to roof must be minimum 2600 mm distance from back of unit to wall must be 100 mm. This unit features low weight, less than half the maintenance requirement compared with oilcooled trans. Retrofit actuator solutions to address customers requirements for remote monitoring and control, lucy switchgear has developed a reliable retrofit kit for the ring switches and circuit breaker of ring main equipment. In case a circuit breaker is the switching device, it. China ring main unit switchgear, ring main unit switchgear. Maintenance of mv switchgear, transformers, ring main. Different combinations of these primary switching devices within the unit are commonly used. De57040en presentation rm6 reii rm6 debc rm6 demt rm6 ded rm6 dei rm6.
It includes in one unit two switches that can connect the load to either or both main conductors, and a fusible switch or circuit breaker and switch that feed a distribution transformer. Outline of switchgear unit 1way 2way 3way 4way when installing ring main unit or compact switchgear with lnternal arc classification afl, the following must be considered. The 8djh compact ring main unit offers a wide variety of module choices. It is available in 18 different configurations suitable for most switching applications within the range from 6 to 40. Designs can include ring switches, transformer fused feeders, circuit breakers, cable feeders, bus sectionalisers and revenue metering panels. On this course we will concentrate on switchgear suitable for medium voltage systems up to 36kv. A ringmain unit is a piece of switchgear used on highvoltage distribution ringmain systems e. An rmu is a ring main unit, a type of switchgear used to connect distribution transformers to an underground, secondarydistribution 11 kv in the uk, cable ring main system. Medium voltage mv sf6insulated ring main unit for secondary distribution up to 40. For example, kt denotes a twounit commontank ring main unit made of one load switch unit and one load switchfuse combined unit. Environmentallyfriendly ring main unit switchgear for application in 1224 kv medium voltage distribution networks.
Maintenance of mv switchgear, transformers, ring main units. As sustainability becomes more and more important, this criterion has been taken as a starting point for the design in terms of production and for the entire service life of the switchgear. The primary switching devices can be either switch disconnectors or fused switch disconnectors or circuit breakers. Abb has further extended the saferingsafeplus ring main unit rmu portfolio with safering air that uses dry air as an alternative, environmentally friendly insulation gas. Switchgear type 8djh for secondary distribution systems up to 24 kv, gasinsulated siemens ha 40. These are utilized for medium voltage power distribution. Ring main unit as an important part of secondary distribution. Gasinsulated ring main units fb schneider electric belgie. Ring main unit the development of current power system focuses on the usage of ecological resources. It consists of 2 units of 11 kv, 630 amps, continuously rated, triple pole, non automatic, quick break, air break, fault making load breaking switches, with associated busbars and connections for controlling an incomingoutgoing 11 kv feeder cable.
Ring main unit is of indoor or outdoor type and can be made extensible on both sides. Safering can be supplied as a 2, 3, 4 or 5 way standard configurations with additional equipment according to customer specification. Medium voltage sf gas insulated ring main unit up to 15kv. As sustainability becomes more and more important, this criterion has been taken as a starting point for the design in terms of production and for the entire service life of. The switchgear and busbars are enclosed in a gastight chamber. Commontank ring main unit is combined freely by individual module units. The below figure shows the rmu with 3incomers and 1outgoing feeder to distribution transformer. The switchgear has a unique flexibility due to its extendibility and the possible combination of fully modular and semimodular configurations. Safering safeplus sf 6 insulated ring main unit and compact switchgear installation and operating instructions 6. Rm6 medium voltage switchgear cubicles are perfectly suited for very simple configuration of 1 to 4 functions. Sf6 gas is used as insulating and switching medium. Smart ring is a ring main unit switchgear for power distribution, recently developed by hm power.
The switchgear components vacuum circuit breaker sf6 load break switch sf6 circuit breaker earth switch vacuumair type. These are typically used at lower voltage substations, such as 11kv. Ring main units our range of ring main units rmus are all suitable for both indoor and outdoor locations and are designed to operate in the most extreme environmental conditions. Mv switchgear products find use in growing market for medium voltage switchgear in india, both for primary and secondary distribution segments. New compact gas insulated ring main unit abb group. Abb safering installation and operating instructions manual. The gasinsulated switchgear units are insensitive to environmental in fluences, e. Serv12630id is a vacuum circuit breaker unit with 12kv rated voltage and 630a rated current, both sides. Only tenderers that satisfy the eligibility criteria as stated elsewhere in this document can tender.
Ring main unit is a compact, sealed and enclosed type of switchgear. The connector range is from 10 to kcmil for aluminum and copper conductors with insulation diam from o. Ring main unit rmu introduction electrical concepts. All other corresponding iec publications, national or local safety regulations must be followed during the installation and operation of the switchgear. A compact switchgear solution for secondary power distribution networks. Traditional saferingsafeplus ring main units are well suited to the needs of customers looking for closed sf6 handling and a very low leakage rate. Gasinsulated ring main unit safering and compact switchgear safeplus. The ring main units at different substations are connected together to form the ring and contain a switch that connects a transformer or other equipment in the substation to the ring. Xiria switchgear is a new generation of environmentally friendly ring main unit switchgear for application in 1224 kv medium voltage distribution networks. Sabre vacuum circuit breaker ring main unit up to 15.
Both oil and gas insulated ring main units are the result of extensive innovation, using advanced technologies and are subjected to extensive testing and safety. Ring main unit switchgear comprises of one to four compact functional units such as. Due to its features such as long service life, compact size and recycling, eaton rvac ring main. Using sf6 gas inside the switchgears contributes to the improvement of the reliability, safety and easy maintenance of sfarm units during its life cycle. Indooroutdoor metal clad vacuum switchgear application features. Ring main unit rmu switchgear latest price, manufacturers. Safering is a ring main unit rmu for the secondary distribution network. Contents 24kv lfl type ring main unit susol rmu is enable to install on medium voltage distribution network and mainly used for protection of transformers in compact substations. The ring main unit was introduced in the united kingdom and is now widely used in other countries. As an option, safering can be delivered as extendable ring main unit. The ring main unit rmu is an electrical device applied to the power supply unit of the secondary distribution system. Difference between ring main unit and switchgear orecco. The rm6 is a compact unit combining all mv functional units to enable connection, supply and protection of transformers on an open ring or radial network.
Product catalogue gasinsulated ring main unit and gas. Slaters electricals supplies and installs new and refurbished ring main units from stock. Medium voltage power distribution needs, the rm6 is a compact unit combining all mv functional units to enable connection, supply and protection of transformers on an open ring or radial network. Switchgear type 8djh for secondary distribution systems up to. Switchgear type 8djh for secondary distribution systems up. A ring main unit rmu is a totally sealed, gasinsulated compact switchgear unit. New compact gas insulated ring main unit industrial solutions. Jun 07, 2019 ring main unit is a compact gas insulated switchgear cubicle equipped with sf6 switch disconnector and sf6 circuit breakers. Abb library is a web tool for searching for documents related to abb.
Tambo international airport ort 1012017 tender notice and invitation to bid t1. Low power loss, low maintenance spending, reliable performance, flexible configuration are required on the medium voltage switchgear. Ring main units conductor contact molded conductive insert. Fused switch ring main unit rmu the trident, a rugged, extensible, oil insulated rmu from secondary switchgear provider, lucy electric, is built for easy integration with scada network. An rmu is a ringmain unit, a type of switchgear used to connect distribution transformers to an underground, secondarydistribution 11 kv in the uk, cable ringmain system. Rockwill electric group best manufacturer of recloser. The metal switchgear and rmu medium voltage switchgear primary air insulated switchgear secondary gas insulated switchgear secondary solid ring main unit solution for switchgear indoor ring main unit outdoor ring main unit. Mv gis ring main unit safering gas insulated switchgear. Safering can be supplied in 10 different configurations suitable for most switching applications in 1224 kv distribution networks. Discover lucy electrics range of oil and gas ring main units rmus, medium voltage switchgear and secondary distribution solutions. Erl medium voltage switchgear offers switchgear up to 40. Essentially, its three switches incorporated into one device used to. Secormu is a kind of sf6 gasinsulated metalenclosed switchgear, which use load break switch, load break switch combined with fuse, three position. Medium voltage switchgear devices and transformers for.
Ring main unit is a compact gas insulated switchgear cubicle equipped with sf6 switch disconnector and sf6 circuit breakers. We offer a range of both extensible and nonextensible rmus, mainly 11kv but up to 24kv and 630a to suit your specific application. Ring main unit sf6 gas insulated ring main units rmu. This type of switchgear is used for mediumvoltage power distribution, from 7200 volts to about 36000 volts. You see, complete switchgear simply means, assembly of needed switching devices. Modular nonextensible ring switches are an ideal solution for making a switching point in the network. Airports company soc ltd invites tenders for the maintenance of mv switchgear, transformers, ring main units and minisubstation at or tambo international airport. Ring main unit,rmu is a compact, enclosed and sealed type of switchgear used for medium voltage power distribution. Jan 17, 2018 ring main unit,rmu is a compact, enclosed and sealed type of switchgear used for medium voltage power distribution. The products include vcbs vacuum circuit breakers up to 36kv, the icbs vacuum circuit breakers up to 40ka, cycloalipathic cts and pts and ring main units up to 24kv that use embedded pole technology. Product manual saferingsafeplus sf insulated ring main. Safeplus is from the same product family as safering and has identical user interface.
The switchgear and busbars are enclosed in a gastight chamber, filled with sf6. The function of the ring main unit rmu is to connect the loop network and improve the reliability of the power supply, such as the loop operation of the loop network or the load cut of the ring network. Iec622711 verified lightning impulse withstand voltage. Amongst the wide range of products for sale choice, ring main unit switchgear is one of the hot items.
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