From 300VA to 2000KVA, it complies with international and national standards such as IEC439, GB5226, etc., and the winding adopts the method of removing the tire and winding in full row; The transformer shall be vacuum dipped to make the insulation level of the transformer reach F or H, and the product performance reach the advanced level at home and abroad. SG series three-phase dry type isolation transformers are widely used in circuits with AC 50Hz to 60Hz and voltage below 2000V, and are widely used in imported important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectification devices, lighting, etc. The various input and output voltages, connection groups, the number and position of regulating taps (generally ± 5%), the distribution of winding capacity, the configuration of secondary single-phase windings, the application of rectifier circuits, and whether the enclosure is required can be carefully designed and manufactured according to the user’s requirements.

Product features

The establishment of a new neutral grounding in the isolation transformer can eliminate the common mode interference and other midlines in the power grid. The isolation transformer converts the three wire △ connection to the four wire Yo system. The shielding further eliminates the high-frequency pulse interference and noise coupled by the transformer. Although the shielded isolation transformer can effectively prevent various N-G interference (pulse and high-frequency noise), the transformer must be properly grounded, Very strict, otherwise the anti common mode interference will be ineffective. The company can design and produce high-quality isolation transformers for customers.

Feature advantages:

High isolation

N-G has good performance

High common mode interference suppression

Convert △ to Y or Y to △

Voltage tap is easy to switch

Designed according to the special performance requirements of users

Application of the Isolation Transformer in Stabilized Voltage Power Supply

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

1. If the third harmonic and interference signal of the power grid are relatively serious, △/Yo isolation transformer can be used to remove the third harmonic and reduce the interference signal.

2. △/Yo isolation transformer can be used to generate new neutral line, so that the equipment has nothing to do with the neutral line of the power grid to avoid abnormal operation of the equipment due to poor neutral line of the power grid.

3. The current waveform distortion caused by nonlinear load (such as the third harmonic) can be isolated without polluting the power grid.

2、 Connect the isolation transformer (star/delta) at the power output end

1. It can prevent the current distortion of nonlinear load from affecting the normal operation of the stabilized voltage supply and returning to the power grid, so as to purify the power grid.

2. The distortion of nonlinear load current affects the accuracy of sampling. You can sample at the input of Yo/△ isolation transformer to obtain control signals that can reflect the actual situation, so that the stabilized voltage supply can be controlled normally.

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

technical parameter

Insulation grade F, H and HC are available (generally F)

Wiring mode: Y/Y, Y/△, △/Y, any combination of △/△

Electrical strength Power frequency sinusoidal voltage 3000v, lasting for 1 minute, without breakdown and flicker

Overload protection twice the rated current for 1 minute

Frequency 50Hz/60Hz

Cooling mode Self cooling

Cooling type: dry

Core form Core type

Damp proof mode Open type

Ambient temperature – 15 ℃+40 ℃

Altitude ＜ 1000m

Product model: with case SG without case: SBK

Input voltage: any rated voltage below 2000V ± 10% Ambient temperature – 15 ℃ -+40 ℃

Output voltage: any rated voltage below 2000V+5% (no-load) altitude<1000m

Input current: output current efficiency ≥ 95%, relative humidity<90%

No additional waveform distortion The installation site shall be free of gas, steam, chemical deposition, dust, dirt and other explosive and corrosive media that seriously affect the transformer insulation

Function with chassis configuration: with input voltage, output voltage and current indication, protection switch can be configured as required

The protection has over-current protection and can be left unattended for a long time

Insulation resistance ≥ 50M

Electrical strength, power frequency, sinusoidal voltage, 2000V, without breakdown and flashover for 1 minute. If the special conditions for use do not meet the above requirements, the user shall negotiate with our factory to determine

Overload capacity twice the rated current for 1 minute

Specifications, models and installation dimensions

Specification Input voltage Output voltage Without enclosure Product size (cm)/weight (kg) With enclosure size (cm)/weight (kg)

SG-5 KVA 660V, 400V, 380V, 200V

380V can be customized according to customer requirements

220V, 110V, 36V

Customized according to customer requirements × fifteen × 25/35 45 × twenty-five × 30/56

SG-6KVA 30 × sixteen × 25/40 45 × twenty-five × 30/64

SG-7KVA 35 × fifteen × 30/45 50 × twenty-five × 35/80

SG-8KVA 35 × sixteen × 30/55 50 × twenty-five × 35/80

SG-10KVA 42 × twenty-one × 42/90 60 × thirty-two × 65/130

SG-15KVA 1140V, 690v, 480v, 660V, 400V, 440v, 415V, 380V, 200V

1140V can be customized according to customer requirements

660V, 690v, 480v, 460v, 450v, 380V, 220V, 200v, 208v, 280v, 127v, 110V, 36V

Customized according to customer requirements 52 × twenty-four × 52/135 70 × thirty-five × 77/185

SG-20KVA 52 × twenty-four × 52/180 70 × thirty-five × 77/220

SG-30KVA 55 × twenty-eight × 65/220 80 × forty × 87/260

SG-40KVA 61 × thirty × 65/265 90 × fifty × 95/320

SG-50KVA 61 × thirty × 65/295 90 × fifty × 95/360

SG-60KVA 70 × thirty-two × 66/370 100 × fifty × 105/440

SG-80KVA 70 × thirty-two × 67/450 100 × fifty × 105/530

SG-100KVA 75 × thirty-five × 68/490 100 × fifty × 105/570

SG-120KVA 75 × thirty-five × 68 100 × fifty × 105/600

SG-150KVA 85 × thirty-seven × 68 120 × sixty-five × 115/690

SG-180KVA 95 × forty-five × 83 120 × sixty-five × 115/930

SG-200KVA 95 × forty-five × 83 120 × sixty-five × 115/1010

SG-250KVA 95 × forty-five × 83 120 × sixty-five × 115/1180

SG-300KVA 105 × forty-five × 95 120 × seventy × 125/1450

SG-320KVA 105 × forty-five × 95 130 × fifty × 135/1490

SG-350KVA 105 × forty-five × 95 130 × fifty × 135/1600

SG-400KVA 115 × fifty-five × 105 140 × sixty × 145/1700