SF6 Gas Insulated Ring Main Unit

· 24kV SF6 Gas Insulated Ring Main Unit- Susol RMU is used to sectionalize underground power distribution network under 24kV. Its various characteristics include disconnecting faulty section, interrupting fault current for load and protecting transformer by power fuse or circuit breaker. It is also enable to establish Compact Subsation through combination with transformer.

Rating

Overview

Rated voltage kV 12 17.5 24

Rated frequency Hz 50/60 50/60 50/60

Rated power frequency withstand voltage kV 28 38 50

Rated lightening impulse withstand voltage kV 75 95 125

Rated current (busbar) A 630 630 630

Rated short-time withstand current (3s) kA 21 21 21

Rated input current kA 54.6 54.6 54.6

Rated internal arc current (1s, AFL) kA 21(16)* 21(16)* 21(16)*

Rated gas pressure Psi.G 5 5 5

* Only for Multi-panel type RMU

CSS Airport Wind Power Solar Power

Power Plant Substation

Features

Configuration

Safety•Safe operation and control under the condition of conducting state of cable•�Mimic diagram display which is installed on the front face of panel indicates

operation state•Automatical interlock system

- Only operates when the door is completely closed- Only enable to approach to Fuse compartment when LBS (Load Break Switch)is on 'earth' state

- Installed voltage detector for checking cable conducting state•�Designed by Rupture disk structure in order to protect the product from

emergency likewise gas expanding•�Perfomed Internal arc withstand test for safe operation in case of fault current

occuring.

Saving cost•No need of further maintenance for HRC power fuse once installed• Comfort to install the product at narrow place as RMU has minimized space

for operation and control

Technology•Indoor Metal enclosed unit, Type test finished •SF6 gas insulation•Easy maintenance and installation•3 Position (close - open - earth)load switch installation

Durability and usefulness• Using closed type iron tank in order to avoid interruption from dust, insect and

water•Enable to control Load Break Switch in front of RMU• Interlock system operates automatically depending on switch position, for

guaranty of safety for operator •No need of recharging SF6 gas•Motorized operation mechanism (Remote control available with FRTU)• In case of fault RMU is automatically tripped due to the striker pin of HRC

power fuse mechanism

3-position RMU opearation

Main close Open Earth

•LBS

Vacuum Interrupter

•VCB

In case of Closing, circuit current flows through electrode pole of interrupter, the contact is quickly opened when fault current occurs which needs rapid interruption. The arc on the surface of the contact is protecting the contacts from the damage and temperature rising thanks to its spiral structure which makes an induction field. Metal vapor which makes the arc will be condensed on the shield near the contact, so finally metal vapor will be disappeared due to arc extinction. the product material from metal vapor will be rapidly condensed, and the contact restores insulation to endure recovery voltage.

current path

•Fuse-LBS •Cable compartment •OCR

OCR operation is based on self-power of internal CT(Current Transformer), also enable to configure the characteristics such as inverse-time or definite-time against to short-circuit, overload and grounding. You can configure parameter by HEX switch on the front cover or customer-friendly control by computing. It also provides digital memory for saving slot to record recent trip value. This OCS has been used for distribution network as it obtained credibility through customers in worldwide.

1. Screened body2. Inner screen3. Compressing lug4. Stress cone adapter5. Earthing eye and lead6. Theaded pin7. Rear plug with test point8. Test point9. Conductive end cap

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❷❶❸

❻

❼❽❾

❹

arc

moving direction of high-current arc

LSIS constantly endeavor to improve our products so that information in this catalog is subject to change without notice.

SIEF_RMU_Reflet_E_1409 / 2014. 09 / (01) 2014. 09 STAFF

◼ HEAD OFFICELS-ro 127 (Hogye-dong) Dongan-gu Anyang-si Gyeonggi-do Korea Tel. (82-2)2034-4840, 4911, 4914 Fax. (82-2)2034-4648