SF6 Gas Insulated Ring Main Unit
Overview
· 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.
Power Plant
Substation
CSS
Airport
Wind Power
Solar Power
Rating
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
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)*
5
5
5
Rated current (busbar)
Rated gas pressure
* Only for Multi-panel type RMU
Psi.G
Configuration
•LBS
•VCB
3-position RMU opearation
Main close
Vacuum Interrupter
Open
Earth
current path
moving direction
of high-current
arc
arc
•Fuse-LBS
•Cable compartment
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.
•OCR
❻
❸
❶
❷
❺
❼
❽
❾
❹
1. Screened body
2. Inner screen
3. Compressing lug
4. Stress cone adapter
5. Earthing eye and lead
6. Theaded pin
7. Rear plug with test point
8. Test point
9. Conductive end cap
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.
Features
Technology
Safety
•Indoor Metal enclosed unit, Type test finished
•SF6 gas insulation
•Easy maintenance and installation
•3 Position (close - open - earth)load switch installation
•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.
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
LSIS constantly endeavor to improve our products so that information in this
catalog is subject to change without notice.
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
◼ HEAD OFFICE
LS-ro 127 (Hogye-dong) Dongan-gu Anyang-si Gyeonggi-do Korea
Tel. (82-2)2034-4840, 4911, 4914
Fax. (82-2)2034-4648
SIEF_RMU_Reflet_E_1409 / 2014. 09 / (01) 2014. 09 STAFF