Mini-Sub type 8FB20 upto 24kV
Solution for Quality Power....
Answers for energy.
Technical Data, Design & Construction
Medium Voltage Mini-Sub type 8FB20 upto 24kV
Solution for Quality Power.....
General Characteristics
Electrical Data
0
Ambient temperature upto
40 C
Reference standard
IEC62271-202
Standard Colour
RAL7032
Rated voltage
12/24Kv1
Duty
Outdoor/Indoor
Rated power frequency
Enclosure degree of protection
28/50kV2
withstand voltage kV rms, min
X'mer compartment
IP23
Rated lightning impulse
MV/LV compartment
IP54
withstand voltage kV, 1.2/50 µS
75/125kV2
Type of ventilation
Natural
X'mer rating upto
1600kVA
Rated enclosure class
15
1
2
Siemens has been serving the Indian market with a
wide range of Medium voltage Power Distribution
Systems for more than four decades. Siemens Mini-Sub
(MSS) is a product from the MV Distribution product
family and is designed keeping in mind the fast
growing power needs of Indian cities, combined with
reduced urban space availability.
RMU type - 8DJH for 24kV
Higher BIL available on request
Standard Variants
RMU
LV dist
X‘mer
ACB
LV
MV
MCCB
The MSS can be ideally installed in residential and
commercial complexes, industrial environments,
utilities where free space is a major constraint.
8FB20-201
Key Features:
• Factory built and tested
• Tailor made options to cater different requirements
• Easy and simple to install reducing the on-site
operation
• Ready for network connection
• Design complies to new IEC 62271-202
• Maintenance free SF6 insulated Ring Main Unit for
MV networking
• SCADA compatible equipments
• Available with oil cooled/dry type transformers up to
1600kVA
• Rust, corrosion and weather proof enclosure
• Independent access for all the compartments for
routine maintenance
RMU
X‘mer
LV dist
ACB
LV
MV
MCCB
MV Metering
8FB20-202
RMU
X‘mer
LV dist
ACB
LV
MV
MCCB
APFC
8FB20-203
Equipment Details
Electrical equipment in the Mini-Sub
MV Switchgear:
Ring Main Unit type 8DJHST in Mini-Sub
• Maintenance free
• Gas insulated metal enclosed RMU is used for the MV
networking in the Mini-Sub
• Ring feeders are provided with three position
disconnector switch, while transformer feeders are
• provided with circuit breaker acting as three position
switch
• Block type construction
• Cable connection are from front
• Logical mechanical interlocks
• Manual operating mechanism (option: with motor)
• Capacitive voltage detection system for all the feeders
• Extensible version available on request
Distribution Transformer:
• Mini-Sub is designed for transformers rating upto
1600kVA/24kV
• Oil cooled hermitically sealed/dry type transformers
• Transformer is factory fitted inside the Mini-Sub
Optionally the transformer can be installed at site
• The Mini-Sub is designed for lifting along with the
transformer fitted inside
Low Voltage Distribution:
• Mini-Sub is designed to house tailor made solutions
for different LV distribution
• Product range includes Air Circuit Breakers, Moulded
Case Circuit Breakers, fuse switches
• Solutions for automatic supply changeover in case of
supply failure by providing DG incomer in tandem
with Mini-Sub transformer incomer
• Capacitor panel with automatic power factor
regulation rated as per transformer capacity
Internal Connections & Accessories:
• MV to transformer with MV cables
• LV to transformer with busbars/LV cables
• Cables connections inside the RMU with elbow cable
adaptors
• MV connections at transformer with high voltage
insulation or optionally with elbow connectors
Product Range
Product Overview
L
LV
Distribution
W
MV RMU
Outdoor
L.V. Panel
Model
Outdoor
R.M.U
Mini-Sub comprises:
• 2mm thick CRC steel sheet enclosure mounted on a
hot-dip galvanized ISMC Channel. Doors on each side
of the Mini-Sub provide access to the MV RMU, LV
and transformer.
• MV switchgear is a compact SF6-insulated ring main
unit with VCB for transformer switching.
• Transformer can be either oil cooled or dry type.
• LV distribution is done with the help of incoming ACB
and outgoing MCCB/switch fuse. This can be
customized as per the requirement.
• Optional APFC panel can be accommodated with up
to 400kVAr capacitor bank controlled by an intelligent
microprocessor based power factor correction relay
with data logger.
• Cable entries are from bottom.
Standard Variants
8FB20-201
MV with 3 way RMU with up to 1600kVA transformer and LV
8FB20-202
MV with 3 way RMU with MV metering, up to 1600kVA transformer and LV
8FB20-203
MV with 3 way RMU with up to 1600kVA transformer, APFC & LV
Note:- Combination of 8FB20-202 & 203 is also available on request.
RMU with different configuration are also available as per the requirement
Dimensions
1
L*
W
H
8FB20-201
2800
2200
22001
8FB20-202
3350
2200
22001
8FB20-203
3350
2200
22001
For 1600kVA rating the height of the mini-sub 8FB20
shall be 2650.
*Dimensions with 3 way RMU for MV side. The same
may vary depending on the RMU configuration.
Transport and Installation:
• Mini-Sub are delivered with protective covering for
local shipment and packed for sea shipment for
export.
• Local transport is done on open truck and for export
the same is done in open top containers.
• Mini-Sub are factory assembled and ready for
installation on the concrete foundation provided at
site.
• The internal connections are done in factory and only
the network cables are to be connected at site.
Product Quality and Customer Benefits
Quality Assurance:
The Mini-Sub is manufactured in accordance with the
latest IEC 62271-202 and Siemens high standards for
quality and environment (ISO9001 and ISO 14001).
Personal Safety:
All live parts in the Mini-Sub are protected against
unintentional contact by means of lockable /
mechanically interlocked door and covers. The Low
voltage parts are also protected with unintentional
contact. The enclosure of the Mini-Sub is effectively
earthed with the earth busbar forming a grid inside the
Mini-Sub interconnecting all the equipments. Provision
for connecting the external grid earth is given on either
sides of the Mini-Sub.
Climatic and Environmental Protection:
The Mini-Sub enclosure is designed for withstanding
the harsh climatic conditions by high quality surface
treatment and powder coated paint as per proven
Siemens standards.
This ensures the exterior/interior finish remains Intact
for all the environmental and climatic changes. All the
parts are designed to take care of outdoor and vandal
free installations. Protection against theft is taken care
by providing lockable doors and mechanically
interlocked covers.
Modular Design:
Factory assembled Mini-Sub is ready for installation. In
areas where completely assembled unit cannot be
transported, the Mini-Sub can be dispatched in
modular form and can be installed at site. Modular and
completely bolted design allows this flexibility to overcome the space crunch.
Advantages:
• Complying with latest IEC 62271-202 for unitized
substation
• Different range of distribution transformers
• Maintenance free ring main unit type 8DJHST is used
for MV networking, type tested for internal arc fault
• All live parts in the Mini-Sub are protected against
unintentional contact by means of lockable doors
• Reduced overall plant and operating costs
• Unmanned substation
• Compact: Can be installed in a limited space of
6 sq. meter
• Appealing aesthetics
Would you like to find out more ?
Please do not hesitate to contact us at any of the following address:
Siemens Ltd.
Energy Sector
Power Distribution Division
Medium Voltage
Thane Belapur Road
Thane 400 601, India
Tel.: +91 22 2762 3140
www.siemens.com/energy
Siemens Ltd.
Industry Sector
Building Technologies Division
Low Voltage Global Components
Thane Belapur Road
Thane 400 601, India
Fax: +91 22 2764 5627
Email: globalcomponents.in@siemens.com
www.siemens.com/industry
“Product development is a continuous process. Consequently the data
indicated in this booklet is subject to change without prior notice.
For latest issue contact our Sales Office.”
Siemens Ltd.
ENE-03-115-001
Customer Care Toll Free No.: 1800 220 987
Email: adscs.india@siemens.com