Dry-type step-up transformer 630KVA380v690v tunnel step-up
transformation
A brief description of the booster transformer for tunnel
construction
The tunnel transformer can solve the problem that the voltage of
the power grid is lower than 300v or even lower, the line is too
long and the voltage is too low, and too many equipments cause all
equipment to fail to start and use normally. Using a voltage
booster can increase the voltage to 380-450v, and use electricity.
The device starts and works normally. It is especially suitable for
places where the voltage is too low, such as factories, mines,
roads, railways, tunnels, bridges, irrigation, and air
conditioning.
Characteristics and advantages of step-up transformers for tunnel
construction:
1. It can solve the problem that the low-voltage grid voltage
(300V-380V) equipment cannot operate normally due to the
high-voltage grid being too low (less than 10KV) during peak power
consumption.
2. This product can solve the problem that the voltage of the
high-voltage power grid is normal, and the output of the
transformer cannot reach above 380V, but the equipment cannot
operate normally due to the long low-voltage line (within 5000
meters).
3. Due to the excessive number of electrical equipment used by this
product, the operating voltage is too low, which cannot meet the
requirements for starting and operating all equipment.
4. This product can save about 40-50% of the cost compared with
generating electricity with a generator set.
5. Voltage stabilizers generally have higher requirements for the
working environment, mainly because the integrated circuit of the
device requires a better working environment and is easy to be
damaged; the carbon brush responds slowly and cannot meet the
startup requirements for the instantaneous startup high voltage;
the purchase cost Slightly higher than this product, the mission
life is shorter, and the maintenance cost is higher. This product
can solve the instant high-pressure start, the purchase cost and
maintenance cost are lower, and the installation is simple and the
use environment is not demanding, the volume is small, and it is
convenient for mobile operations.
technical parameter
| Output waveform distortion | No distortion (compared with input waveform) |
| Voltage variation rate | ≤1.5% |
| Output waveform distortion | No distortion (compared with input waveform) |
| Insulation class | F-level, H-level, HC-level are available (normally H-level)
temperature resistance 180 degrees |
| Work efficiency | Self-coupling type＞99% induction type (isolated type)＞95% |
| Output voltage accuracy | ±1% |
| Applicable frequency | 50/60HZ |
| Connection method | Y/Y, A/YOx YO/A, isolation, auto-coupling (optional) |
| Overload capacity | Allow more than 1.2 times the rated load to work for 4 hours
(long-term full load possible) |
| noise | W35dB (within one meter) |
| Heat up | <60°C |
| Insulation resistance | N150MQ |
| Dielectric strength | 3000VAC/lmin |
| Design life | 50 years |
| working environment | Temperature: -20~+45°C Humidity: W95%RH non-condensing |
| workplace | No corrosive gas and conductive dust |
| Safety standard | Product symbol VDE0550, IEC439, JB5555, GB226 and other national
standards |
| cooling method | Dry/air-cooled |
Type selection of step-up transformer for tunnel construction
1. The user's voltage status requires the user to check the no-load
voltage value and the load voltage value.
2. The distance between the transformer and the electrical
equipment The user needs to actually measure the distance between
the user’s transformer and the electrical equipment.
3. The condition of the user's cable The user needs to check the
condition of the cable used by himself. Generally, the total power
of the equipment must be matched.
4. Start the total power of the equipment The user should check the
total power of the equipment used by himself.
Based on the above information, the user can choose the
corresponding model product or propose a customization.
Applicable sites for tunnel construction step-up transformers
1. Ambient temperature: -20~85
2. Relative humidity: ≤90%;
3. The installation site should be free of gases, vapors, chemical
deposits, dust, dirt and other corrosive agents that seriously
affect the insulation of the equipment quality;
4. There should be no severe vibration or bumps in the installation
site;
