We will present the performance, safe operation methods, and technical parameters of YBDM-12 series underground Mounted Transformer
YBDM-12 series of underground box substations (referred to as underground box transformers) are new on the basis of full research and discussion of modern urban construction and management
A new generation of box transducers developed. Its main body is partially or completely buried underground, occupying little or even no land, and the visual effect is very good, which effectively solves the urban use
The contradiction between geotense and urban psoriasis is harmonious and unified with the surrounding environment, and is highly regarded by the majority of experts and users. The underground box substation refers to the box transformer
The complete set of power station devices are all installed inside a fully sealed box and the whole is not controlled below the ground level, and it and the box substation on the ground, the internal equipment
It is the same, and the same 10KV input voltage is reduced to 400/220Vi distribution voltage through the transformer and then sent to the load point, which can be used for ring network distribution system.
It can also be used as a substation for power supply at the end of the radial power grid. This fully buried type is also known as underground substation, and its box has excellent anti-corrosion ability and compressive energy
force, and has absolute tightness.
The pursuit of "novelty" and "beauty" to reflect the environmental protection of modern urban power facilities is the trend of today's power construction and development, and it is also a reflection of one
An important symbol of the city's modernization and civilization. Our company aims to create first-class power equipment, beautify the urban environment, and serve the society, and actively strives to solve the problem
In the installation and maintenance of former power equipment, such as overhead line into the ground project, coastal typhoon salt spray erosion, environmental vision and many difficulties, the introduction and absorption of foreign advanced technology development
Environmentally friendly non-metallic underground buried series substation products.
2. Overview
Model and meaning:
Y B DM □ / 0.4 □
└──Rated capacity of transformer kVA
└──Rated voltage kV on the low voltage side
└── Rated voltage on the high voltage side kV, 12, 40.5
└──Installation method, DM - Underground installation
└──Box substation
└──Pre-installed
2.2 Conditions of use:
Normal conditions of use
a) Altitude
The altitude does not exceed 1000m
b) Ambient temperature
Maximum temperature +40°C
Minimum temperature -30°C
c) Relative humidity
At 25°C, the relative humidity of the air does not exceed 95%, and the monthly average does not exceed 90%.
Installation environment
The installation environment should be free of obvious dirt movement, explosive, corrosive gases and dust. The installation site should be free of violent vibration and shock and cannot be placed in low-lying places.
Special conditions of use
In addition to the above normal conditions of use, other conditions of use shall be in accordance with the provisions of GB1094.1, GB/T 11022, GB/T14048.1 and GB7251.1.
Main technical parameters:
serial number | Items | unit | High voltage unit | transformer | Low pressure chamber | |
Load switch | Fuse | |||||
1 | Rated voltage | kV | 12 | 10/0.4 | 0.4 | |
2 | Rated current | A | 630 | 12-125 | 300-2500 | |
3 | Rated power frequency withstand voltage | kV | 42/48 | 35 | 2.5 | |
4 | Rated lightning impact resistance | kV | 75/85 | 75 | 8 | |
5 | Rated breaking current | kA | 20 | 31.5 | ||
6 | Rated short-circuit closing current | kA | 50 | |||
7 | Rated peak withstand current | kA | 50 | |||
8 | Rated for short-term withstand current | kA | 20 | |||
9 | Rated capacity | kVA | ≤1600 | |||
10 | Noise level | dB | <55 | |||
11 | Protection level | High Voltage Chamber IP33, Transformer Chamber IP23, Low Voltage Chamber IP33 | ||||
Structural characteristics of fully buried box transformers
structure
The structure of the fully buried box transformer is shown in Figure 2.
Fig. 2 Schematic diagram of fully buried box transformer structure
3.2 Structural characteristics
The complete set of devices of the fully buried pre-installed substation are all installed inside a fully sealed box, and the box body part is a high-voltage switch room, a transformer room,
Low voltage switchgear. Each room is equipped with lighting devices, with latching switches, forced ventilation devices, temperature control, heaters and other equipment.
All the above equipment is set below ground level, and its internal equipment is the same as that of a conventional ground-mounted substation, all of which are powered by a 10kV input voltage
The transformer is reduced to 400/220V distribution voltage and then sent to the load point, and the key technology of this fully buried pre-installed substation is the sealing and prevention of the box
Decay and pressure resistance, specifically:
1. The box from the bottom to the wall should be immersed in the ground for 50 years without the slightest corrosion;
2. It should withstand the pressure of soil and groundwater pressure and soaking, while the wall remains intact;
3. All sealing points such as equipment passages, personnel entrances and exits, and cable entrances must be able to withstand the osmotic pressure of groundwater, and there are no water stains inside
Keep the inside of the wall dry and free of moisture.
In addition to meeting the above basic requirements, YBDM fully buried pre-installed substation also has three main functions:
1. There are two water supply channels at one end of the narrow box, and on rainy days, rainwater can be quickly discharged into the sewer through the water supply tank without entering the pre-installed substation.
2. In addition to draining in rainy days, the connecting trough is also the air inlet for circulation and ventilation inside the box, and the air enters the box through the air inlet to form an exchange
keep the temperature and humidity in the box balanced, so that the temperature rise and fall of the transformer;
3. Once there is a flood that occurs once in 50 years or 100 years, the groundwater rises and causes the sewer to backflow, and the ventilation device will be automatic
Shut down, isolate the inside and outside of the box, and continue to operate the pre-installed substation without affecting the equipment.
At present, the substations in some cities in our country are mostly set up in the basement of high-rise buildings, and once they encounter a large flood, they are basically submerged, and most of the equipment is damaged and useless after the water recedes. as
The use of fully buried pre-installed substation as the power distribution device can avoid the equipment being soaked by flooding, and the use of fully buried pre-installed substation has more advantages as described below
Dot:
1. It can greatly save land use, no need for land acquisition and civil construction, and save infrastructure investment.
2. There are no obstacles on the ground, which does not affect the environment, and does not affect people's vision and view.
3. The whole buried type installed on the lawn and green belt can also be designed with some decorative decorations on the ground, such as sculptures, rockeries, etc.; If you need to be in a large square or road
On the side of the road, if there are no obstacles on the ground (including ventilation ducts), a square type pre-installed substation can be used. This pre-installed substation vent
can not expose the ground plane.
4. The power distribution equipment of the fully buried pre-installed substation is set underground, which is safe and reliable.
5. The ground is not affected by transformer noise.
6. Due to the relatively cool underground, the temperature rise of the transformer is relatively stable during operation.
7. The internal space of the fully buried pre-installed substation is relatively spacious, and the maintenance operation will not interfere with the ground and will not hinder the surrounding environment.
