Prefabricated Semi-Buried Packaged Substation

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Buried packaged substation is a new type of complete power equipment. It consists of buried transformer and advertising lamp box type outdoor switchgear. Buried transformer contains the transformer, high voltage load switch and fuse protector. It is installed underground and can operate in water for a period. The advertising lamp box type outdoor switchgear integrates the advertising board and outdoor switchgear. It is installed on ground. The outdoor high and low voltage power distribution cabinet is inside and the advertising lamp box is on two sides, which has great visual effect.

Buried packaged substation conforms to urban ecological design concept, covers a smaller area, beautifies the environment, and applies to urban main streets, residence communities, airports, bus stations and highways. It is the development trend of urban distribution network equipment.

Product introduction

Working conditions:
1. Altitude: ≤1000 m.
2. Ambient temperature:
Highest temperature:+40℃;
  Lowest temperature: -40℃;
  Maximum average monthly temperature: +30℃;
  Maximum average annual temperature: +20℃.
3. Installation environment:
  No explosive or corrosive liquid, gas or dust;
  No severe vibration or shocking;
  Allowing operation partially or completely in water for a specified period.
4. Ground acceleration (ag) caused by earthquake: horizontal <3m/s², vertical <1.5 m/s².
5. Waveform of supply voltage: approximate to sine wave.
6. Three phases supply voltage: approximate symmetry

Technical parameters:
★Main technical parameters and performance of buried transformer
1. Model and specification: ZGS11-Z(H)·D -30~630/10, ZGSH15-Z(H)·D-30~630/10
2. Rated voltage: high voltage 6/10kV, low voltage 0.4kV
3. Capacity range: 30~1000kVA
4. Frequency: 50Hz
5. Number of phases: three phases
6. Connection symbol: Dyn11
7. Short circuit impedance voltage: 4%-4.5%
8. Insulation level:
primary side - power frequency withstand voltage: 35kV
  primary side - impulse withstand voltage: 75kV
  secondary side - power frequency withstand voltage: 5kV
9. Loss: in conformity with S11 series (iron core of silicon steel sheet) national standards; in conformity with S15 series (iron core of amorphous alloy) national standards
10. IP code of shell: IP68
11. Acoustic level: ≤50db
12. Operating environment: basement or pit
13. High voltage connecting pieces: plug-in sealed elbow connector
14. Low voltage connecting pieces: high-quality waterproof and sealing materials
15. Outer shell structure: integrated type, and made up of anti corrosion stainless steel

★Main technical parameters of prefabricated pit
1. Pit is formed by ≥6mm punch-forming steel plates.
2. The whole pit is processed by hot galvanizing.
3. Cover of pit is made up of cement precast slab, with an openable access hole

★Main technical parameters of high voltage switchgear
1. Rated voltage: 12kV
2. Rated frequency: 50Hz
3. Rated current: 630A
4. Rated short time withstand current: 20kA/2s
5. Rated peak withstand current: 50kA
6. Rated short circuit making current: 50kA
7. Rated power frequency withstand voltage (phase to ground/breaking): 42/48kV (1min)
8. Rated impulse withstand voltage (phase to ground/breaking): 75/85kV
9. IP code: IP34

★Main technical parameters of low voltage switchgear
1. Rated voltage: 400V
2. Rated frequency: 50Hz
3. Rated current of major loop: 100A~2000A
4. Rated short time withstand current: 15kA, 30kA
5. Rated peak withstand current: 30kA, 63kA
6. IP code: IP34