1. General technical requirements:
1.1 General specifications of the system:
- Maximum ambient temperature: 450C
- Minimum ambient temperature: 50C
- Average temperature: 350C
- Average humidity: 85%
- Maximum humidity: 95%
1.2 Operating conditions of the power system:
Features of the Power System:
- Nominal voltage: 22kV
- Maximum working voltage: 24kV
- Working mode of the system: Neutral grounded directly
- Temporary overvoltage factor: 1.42
- Time to withstand temporary overpressure: 10s
- Maximum short circuit current/01s: ≥ 25kA.
1.3 For manufacturers of supplies and equipment:
- Experienced > 05 years in the field of manufacturing materials and equipment.
- Being certified with ISO standards (valid) relevant to the field of production
supply goods.
2. Detailed technical requirements:
2.1. Merchandise Requirements:
Goods required in the bidding documents must satisfy the following requirements:
- Is a brand new, unused, defect-free, quality product
Good guarantee, clear and legal origin.
- A valid ISO quality management certificate with the product name clearly stated
bid is offered.
- Record of type test (Type Test), factory test (Route
Test of equipment of the same type offered for bid) with all items and contents
tested in accordance with product manufacturing standards.
- Catalog of technical characteristics, instructions for installation, operation and maintenance of the manufacturer
The output is printed in color and bound as a volume.
2.2. Mobile substation cabinet:
2.2.1. Structure of the station shell:
- The station cover consists of 3 compartments:
o Medium voltage compartment.
o Transformer compartment.
o Low pressure compartment14
2.2.2. General description:
2.2.2.1. Station shell
- Substation shell is made of zinc coated Tole, powder coated
- Substation enclosure must be manufactured according to IEC60349-1, IEC62271-200 standards;
IEC1330:1995.
- The substation enclosure is made with IP54 protection (medium-voltage and low-voltage compartments and
contains transformers).
- The cover of the station is fitted with lifting hooks suitable for transportation.
- Substation shell baffle is made of steel plate at least 1.5mm thick. There are two panels
partition: partition between medium voltage compartment and transformer compartment; partition between compartments
transformers and low-voltage compartments. The partition has medium and low voltage cable support.
- Doors of high voltage compartment, transformer compartment and low voltage compartment are double doors (02 doors),
with sturdy, fireproof steel hinges, with door locks, handles and safety signs
whole. In addition, the door has a brake to prevent door collision. The door is closed
Sealed by a locking and waterproofing system to prevent insects and rainwater.
- Substation shell must ensure anti-corrosion, anti-rust and be made of dark thick steel
2mm minimum, powder coated both inside and outside, of suitable size for installation
equipment (Transformers,...) and connections, in accordance with international safety regulations and transportation
operate continuously.
2.2.2.2. Base:
- The base is the bearing frame that supports the entire station's equipment and supplies. Crafted from tole
3.5mm, galvanized sheet, powder coated both sides. There are two MBA bearing U steel bars, all
both are joined together by welding, screws and hot-dip galvanized, face
The outside of the base is painted black.
2.2.2.3. Station roof:
- Made of galvanized sheet, outdoor powder coated both inside and outside.
- The roof is connected to the substation shell by penetration welds.
- The roof of the station is placed in front of 4 positions to position the crane conductor when hoisting the machine.
- The roof has a minimum slope of 2% to ensure no water stagnation on the roof.
