11kV Substation
11kv prefabricated transformer substation refers to the complete set of pre-installed and type tested equipments. The main components include transformers, high-voltage switchgear, low-voltage switchgear and ccorresponding internal connecting wires (cables, buses and others) and other auxiliary equipments. These elements are enclosed by a common enclosure or a group of enclosures.
Service Condition
Ambient air temperature
Annual maximum temperature: 40℃
Average temperature in hottest month: 30 ℃
Annual minimum temperature: - 10 ℃
Maximum daily temperature difference: 25K
Altitude: ≤2000m
Ambient humidity
The daily average relative humidity is no more than 90%
The daily average water vapor pressure shall not exceed 2.2kpa
The monthly average relative humidity shall not be greater than 90%
The monthly average water vapor pressure shall not exceed 1.8kpa
Earthquake intensity: 8 degrees
Pollution level: III
Technical data
1. Technical data for transformer substation
Item | Unit | Technical Data | |
Rated Voltage Un | HV Main Circuit | kV | 12 |
LV Main Circuit | 0.4 | ||
Thermal stability current | HV Main Circuit | kA | 20 |
LV Main Circuit | 50 | ||
Dynamic stable current | HV Main Circuit | kA | 50 |
LV Main Circuit | kA | 3 | |
1min Power frequency withstand voltage | HV Main Circuit | kV | 42（For switchgear）35（For Transformer） |
LV Main Circuit | kV | 2.5 | |
Auxiliary circuit | kV | 2 | |
Enclosure | Color steel sheet or customized | ||
Lightning impulse withstand voltage | kV | 75 | |
Protective level of enclosure | IP3X | ||
Noise level | dB | ≤45dB | |
2. Technical data for transformer
Item | Oil immersed distribution transformer/ | ||
Rated Capacity | kVA | 20～2500 | |
Rated Voltage | HV | kV | 11kV or customized |
LV | kV | 0.4kV or customized | |
Load loss and No-load loss | W | As per clients’ requirements | |
Short circuit impedance | % | 4～4.5% | |
Vector Group | D,yn11 | ||
Temperature rise | K | As per GB1094.2-1996 | |
Off-circuit Tapping | kV | 11kV*±2×2.5 % Or 11kV*±5 % | |
3. Technical data for HV switchgear
Item | Unit | Technical Data | |||
Load switch | Other components | ||||
Rated Voltage | kV | 12 | |||
Rated Frequency | Hz | 50 | |||
Rated Current | A | 630 | 125 | ||
Rated short-circuit withstand current | kA | 20（3s） | |||
Dynamic stable current | kA | 50 | |||
Rated short-circuit making current | kA | 50 | |||
Rated current breaking times | Times | ≥100 | |||
Rated short-circuit current Closing times | Times | ≥5 | |||
2S Short time withstand current of earthing switch | kA | 17.4 | |||
1min Power frequency withstand voltage | Phase to earth | kV | 35 | ||
Breaking | 48 | ||||
Lightning impulse withstand voltage | Phase to earth | kV | 75 | ||
Breaking | 85 | ||||
Annual leakage rate of SF6 gas | ≤0.1% | ||||
Load mechanical life | Times | ≥2000 | |||
Mechanical life of earthing knife | Times | ≥2000 | |||
Type | Outdoor | ||||
HV compartment | Incoming | Cable | |||
Outgoing | Terminal Type or Ring unit | ||||
LV compartment | Outgoing circuits | As per clients' requirements | |||
SVC | Dynamic compensation | ||||
