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CSS

Series Compact Substation
 

• Non-walk-in substations

• Purposfully designed for harsh enviroments

• Flexibility in selecting the required LV & MV equipment

• Contains three compartments which are totally separated by galvanized sheets

• IP43 for the LV & MV compartments, IP23 for transformer compartment

• Easy lifting procedure via ‘eyes’ fixed on the roof

• Flexibility in selecting the required LV & MV equipment

• Double roof with air insulation

• Heat Run Tested to class 10 of IEC 61330

• Power coated finish
 

General
CS 24/36 is a series of outside-operated compact secondary substations for voltages up to 36kV. They have been designed and manufactured by KTC. to withstand all operating needs and special environmental conditions in the Iran, Middle East countries and similar places.
The unit is a fully equipped package substation that includes outdoor housing, high voltage switchgear, distribution transformer, low voltage panel, and internal wiring for lighting on all compartments, as such only the incoming cables need to be connected at site and the site works are kept to an absolute minimum.

General Description
CS 24/36 substations are completely self-contained, factory assembled in a totally enclosed metal cladding, weatherproof housing ready for placing into position upon a concrete base pad.
For CS 24 -1000 the complete housing assembly is provided with four lifting eyes located on the sloping roofs for easy lifting and positioning the whole unit at the site by the use of crane
While the range from CS 24-1600 &CS 36, the complete housing assembly is provided with four lifting lugs located on the baseframe. The substation can be lifted without damage or distortion.
The housing of the kiosk is mainly made of corrosion resistant 2mm galvanized steel sheets.
In addition, 3mm galvanized steel sheets are used for stronger support in the base frame or in the corner post. Last finish coat is power paint of polymer resin base color to RAL 7032 or RAL 7033. Other colors are available upon request.
Each substation contains three main equipment: transformer, MV switchgear and LV switchgear each is contained in a separate compartment. The compartments are completely separated by iron steel sheet. The barrier between the HV switchgear and the transformer is provided with pressure relief flaps. All compartments are individually accessible by their own door from outside. Labyrinthian louvers with sand traps at the bottom form the sidings of the transformer compartment to assure free entry and exhaust of air, as such the inside temperature is kept within limits. The cooling of transformer is by natural system. The substation is provided with a metallic ceiling as additional provision to diminish heating due to solar radiation.

Transformer Compartment
This compartment is specially designed to provide the transformer with sufficient volume of airflow for cooling through adequately sized and professionally designed ventilation openings. These opening located on both sides of the compartment are uniquely designed to trap the sand from entering the compartment, hence, they are called sand traps.
The compartment is provided with a pressure relief system integrated in the ceiling/roof. As an option, a floor mesh can be provided to prevent entry of small animals and other foreign objects, while assuring continuous airflow and circulation. Oil-immersed or dry type (cast resin) transformers can be accommodated on this compartment.

MV Compartment
This compartment can be equipped with wide varieties of MV switchgear. For voltages up to 24kV, standard SF6 insulated ring main units (RMU) like ABB SAFERING &SIEMENS 8DJ 10 can be provided. The basic configuration is CCF which consist of two load break switches and one switch-fuse combination for transformer protection, all contained in a single sealed tank.

Whenever extensible compact switchgear is required, ABB SAFEPLUS SF6 insulated switchgear can be provided for voltages up to 24kV.
For voltages up to 36kV, ABB CSF2 SF6 insulated switchgear can be provided to protect the distribution transformer. Load break switches and circuit breaker modules can be combined together in different arrangements as per customer needs.
Alternatively, air insulated switch and fused switch option is also available for voltages up to 36kV. Each switch/ fuse-switch can be equipped with a mechanically interlocked earthing switch with making capacity.

Low Voltage Section
This compartment contains the Low Voltage Distribution Board (LVDB), which is fed from the secondary side of the transformer. The LVDB can be designed in different arrangements and configurations in order to suit any specific application. Copper busbars are provided for the phases and neutral suitable to the transformer secondary voltage and current ratings. A ground bus linked to the neutral bus is also provided.

The following equipment can be accommodated inside the panel:

• Air circuit breakers, ACBs

• Moulded case circuit breakers, MCCBs

• LV Fuse switches / Fuse ways

• Instrumentation and metering

• Automatic transfer scheme, ATS

• Street lighting system

• Power factor correction panel

• Grounding System
The substation forms a complete metallic structure bolted together and each compartment is provided with grounding busbars.

Bonding and interconnection of the grounding buses are made of 70mm2 bare stranded copper conductors. The ring main unit (RMU) as well as the low voltage panel (LVDB) is provided with grounding bus from which connection to the grounding system at site can be made.