| Type: | Power |
|---|---|
| Structure: | Protection |
| Certification: | ISO9001:2000, CCC |
| Form: | Partly-welded Type |
| Operation Voltage: | High Voltage |
| Size: | 3 Uint |
| Customization: |
|---|
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Audited Supplier 
Product Description
Underground Combined Power Transformer Substation
1, underground box with corrosion, waterproof, low temperature rise, low noise, easy installation, maintenance-free and other characteristics; It is a typical energy-saving product.
2, the tank is made of low alloy structural steel, its comprehensive mechanical properties, welding properties and low temperature toughness and other properties are very good, the box using hot spray zinc technology and supplemented by spray treatment, strong corrosion resistance.
3. Fully sealed structure is adopted. Exposed parts of high and low voltage terminals are isolated from the environment through imported sealed waterproof materials. When the local buried transformer is installed, it is placed in the pit. When the pit is flooded or even submerged, it can still operate safely, resist flood disasters, and effectively improve the reliability of the power supply system.
4. The unique heat sink structure is adopted to ensure the heat sink's heat dissipation capacity and rust prevention ability.
5, low pressure cabinet protection shell with patent outdoor light box type protection shell, light box type shell can be installed on both sides of the all-day advertising board, using small volume, green energy saving LED luminous components.
6. The underground transformer base is preassembled structure, which can be prefabricated with different materials flexibly according to customer requirements.
Technical parameters:
| No. | Item | Unit | Parameters |
| 1 | Rated voltage | kV | 12 |
| 2 | Rated frequency | Hz | 50 |
| 3 | Rated current of load switch | A | 630 |
| 4 | Main circuit thermal current | kA | 20 |
| 5 | Main circuit dynamic current | kA | 50 |
| 6 | Rated making current of main circuit | kA | 50 |
| 7 | Rated active load breaking current | 630 | |
| 8 | Rated ring closed breaking current | A | 630 |
| 9 | 5% of rated active load breaking current | A | 31.5 |
| 10 | Rated breaking current of cable charging | A | 10 |
| 11 | Rated no-load breaking current of transformer | A | 1600KVAq |
| 12 | Rated breaking current of fuse | kA | 31.5 |
| 13 | Rated transfer current | A | 1500 |
| 14 | Mechanical duration | times | 10000 |
| 15 | 1min power frequency withstand voltage to earth/between phases/disconnecting fracture | kV | 42/48 |
| 16 | Lightning impulse withstand voltage to earth/between phases/disconnecting fracture | kV | 75/85 |
| 17 | Rated pressure of SF6 (20ºCsurface pressure) | Mpa | 0.045 |
| 18 | Annual leakage rate of SF6 | ≤0.2% |
WORKING CONDITIONS
1. Altitude: no more than 1000M.
2. Ambient temperature: high temperature: +40ºC; Low temperature: -45ºC : high monthly average temperature: +30ºC : high annual average temperature: +20ºC;
3, installation environment: no explosive, corrosive liquid, gas and dust, installation site without violent shock, allowed in a certain period of time Or run completely submerged in water.
4. Ground acceleration induced by earthquake Ag; The horizontal direction is lower than 3m/s; The vertical direction is lower than 1.5m/s.
5, the waveform of the power supply voltage: approximately sine wave.
6, three-phase power supply symmetry: for three-phase underground transformer, three-phase power supply voltage should be roughly symmetrical.
Suppliers with verified business licenses
Audited Supplier 
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