Photovoltaic isolation transformer

Overview of Photovoltaic Isolation Transformer Products:

The JLSG series photovoltaic isolation transformer is widely used for indoor electrical power equipment with AC 50 or 60Hz and voltage up to 1500V. The input and output voltage, connection group, tap position adjustment, winding capacity allocation, secondary winding configuration, and whether casing is required of the product can all be carefully designed and manufactured according to the user's requirements

Structural characteristics of three-phase dry-type isolation transformer:

Adopting insulation systems based on F and H levels, the transformer maintains * * electrical and mechanical performance throughout its entire service life. F. H-grade materials are not easily aged, resistant to shrinkage and compression, and have strong elasticity, which ensures that the coil of the transformer remains tightly structured even after years of use and can withstand the pressure of short circuits; The transformer as a whole is impregnated with H-grade impregnating paint under vacuum pressure (VPI), and then cured at high temperature in an oven. Transformers are generally designed for natural air cooling, while forced air cooling can be designed according to user requirements. At this time, the external dimensions and weight of the transformer will be reduced

Performance parameters of three-phase dry-type isolation transformer:

1. Rated capacity: 1kVA~2000kVA

2. Connection group: Dyn11, Yyn0

3. Power frequency withstand voltage: 3kV/min

4. Insulation and heat resistance level: F, H level

5. Temperature rise limit: The temperature rise of the iron core shall not exceed 85K, and the temperature rise of the coil shall not exceed 95K

6. Rated input voltage: three-phase 380V or single-phase 220V

7. Operating frequency: 50Hz-60Hz

8. Efficiency: ≥ 98%

9. Waveform distortion:<0.1%

10. Insulation resistance: winding resistance to ground insulation resistance three-phase ≥ 3.8M Omega; Single phase ≥ 2.2M Omega

Function of three-phase dry-type isolation transformer:

By establishing a new neutral grounding system using photovoltaic isolation transformers, common mode interference and other neutral line troubles in the power grid can be eliminated. Three phase isolation transformers convert the three wire delta connection to a four wire Yo system, and adding shielding further eliminates high-frequency pulse interference and noise coupled inside the transformer. Although shielded isolation transformers can effectively prevent various N-G interferences (pulses and high-frequency noise), the transformer must be properly grounded and strictly grounded, otherwise anti common mode interference will be ineffective. Our company designs and produces high-quality isolation transformers for customers.

Characteristics and advantages of three-phase dry-type isolation transformer:

1. Highly isolated

2. N-G has good performance

3. High common mode interference control

4. Convert △ to Y or Y to △

1. Voltage tap is easy to switch

6. Design according to the user's special performance requirements

Application of isolation transformer installed in stabilized power supply

1、 Connect an isolation transformer (delta/star) at the power input end

1. If the third harmonic and interference signals in the power grid are severe, using a △/Yo isolation transformer can remove the third harmonic and reduce the interference signals.

2. A △/Yo isolation transformer can be used to generate a new neutral line, making the equipment independent of the grid neutral line and avoiding abnormal operation of the equipment due to poor grid neutral line.

3. The current waveform distortion caused by nonlinear loads (such as third harmonic) can be isolated without polluting the power grid. 2、 Connect an isolation transformer (star/delta) at the power output end

1. To prevent current distortion of nonlinear loads, which affects the normal operation of the regulated power supply and returns to the power grid, and plays a role in purifying the power grid.

2. The distortion of nonlinear load current affects the accuracy of sampling. It can be sampled at the input of Yo/△ isolation transformer to obtain a control signal that reflects the actual situation, so as to ensure the normal control of the regulated power supply.

3. If the load is unbalanced, using Yo/△ will not affect the normal operation of the regulated power supply.

threeElectrical schematic diagram of coherent isolation transformer

Three phase dry-type isolation transformer usage conditions:

1. Applicable altitude: ≤ 5000m

2. Environmental temperature: -15 ℃ to+40 ℃

3. Relative humidity: ≤ 85%

4. The installation site should be free of gases, vapors, chemical deposits, dirt, conductive dust, and other explosive, flammable, and corrosive substances that seriously affect the insulation strength of the voltage regulator.

Any items that do not meet the above usage conditions should be determined through consultation with us.

The winding connection method of isolation transformer: