1600kVA~5000kVA 2 Winding Power Distribution Oil Filled Oil Free Voltage Changer

                                   
                        Complete Voltage Oil-immersed Dry Type Power  Transformer

Component reference diagram:


Zhongda Technology has rich experience in the design and production of power transformers, special transformers, voltage stabilizers, reactors and power supplies, and can provide customers with transformers of various standards and special designs.

The power transformers we provide include: amorphous alloy three-phase oil-immersed, single-phase oil-immersed, three-dimensional wound core, three-phase oil-immersed, three-phase on-load oil-immersed, high-overload oil-immersed, amorphous Iron core dry type, epoxy resin cast dry type and insulated non-encapsulated dry type, etc.

Structure characteristic:
1,Iron core
1. 1The iron core adopts cold-rolled crystal-oriented silicon steel plate 30Z140 with high quality, low-loss, and no time effect, sheared by Geroge line and with no burr. 1.2 Iron core adopts pulling board structure, the upper and down yoke is clamped by board, to form the frame structure. The iron core adopts advanced lamination
process, which effectively controls the no-load loss and electro-magnetic noise.
2 Winding
2.1 Winding adopts mature structure, which ensure the reliability of transformer operation.
2.2 The insulation power field intensity between turns shall be controlled no greater than 1.6kV/mm.

3,Body
3.1 Body adopts mature insulation structure, and strictly guarantee the main axial insulation margin.
3.2 Body mostly adopt multi-coil whole assembly, processed in constant voltage and evaporation, which made coil shrink evenly and with less rebounce, and enhance the electric strength and mechanical strength.
3.3 Adopt laminating wood board or thermal shaped insulation cardboard. Pressed tightly with pin, which ensure the winding is constantly pressed tightly. 

4,leading wire
4.1 The layout of all leading wire is reasonable, which guarantees the enough electric distance and mechanical strenth. 
4.2 All leading wire is cirlulized ,which guarantee the reliable wild or prize connection. 

5,Oil tank
5.1 Oil tank adopts structure of flat top, bell jar type, which add the mechanical strength of oil tank and also make the appearance beautiful and graceful, site installation tend to be more convenient.
5.2 Pipeline with gas relay such as the oil tube and bushing hoist support on top of oil tank is with hoist gradient, to facilitate the gas in transformer flow to gas relay.
5.3 Vacuum oiling is adopted, there is no leakage and permanent distortion in the following test. vacuum-pumping :759mmHg load voltage test: bear 2 times the oil pressure of oil conservator oil surface for 24 hours.
5.4 The structure of transformer is convenient for disassembly and change of bushing and porcelain element.
5.5 The oil drip valve is set on the bottom of oil tank, sampling valve is set in the middle.
5.6 collective gas connecting tube is fixed on the bushing hoist support.
5.7 Transformer is of full-sealed structure, the upper and down oil tanks are required to welded fully. 

6,Oil conservation tank 
6.1 Adopt capsule type, finger type oil level indicator oil conservation tank. 
6.2 The structure is convenient for internal cleaning, the capacity can ensure no oil overflow in 40 ambient temperature with full load, and oil shall be seen from oil level indicator before put into operation in -25.
6.3 Oil conservation tank is equipped with oil-sealed moisture absorber. 

7,Safety protection device:
7.1 Gas relay is fixed in transformer, the standard complies with ZBK41004-89Gas relay.
7.2 There is enough and reliable pressure release device, and matched with oil spray pipe, the direction of oil spraying is downward. 

8,Oil temperature measuring device:
8.1 There is pipe support of mercury thermometer, which is  set on the top of oil tank.
8.2 There is temperature controller,  the accuracy of thermometer complies with the related standard. Quantity and technical requirement shall as per tender document. 

9,Each component  of transformer shall be prefabricated once in manufacture factory, marked, to ensure the smooth procedure of site assembly. Before Ex-factory, inner core shall be check, and clean the fifth in transformer.

Special transformers include: single-phase control transformers, three-phase dry-type transformers, toroidal transformers, furnace transformers and rectifier transformers, etc.

Stabilizers include: high-power regulators, precision smart regulators and fully electronic regulators, etc.

Reactors include: three-phase and single-phase reactors

Power supply includes: laboratory power supply, intelligent control power supply, single-phase to three-phase power supply and aging power supply.


Overview
Three-phase transformers are widely used in circuits with AC 50Hz to 60Hz and voltages below 660V. They are widely used in imported important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifiers, lighting, etc. The various input and output voltage levels of the product, the connection group, the number and position of the adjustment taps (usually ±5%), the distribution of winding capacity, the equipment of the secondary single-phase winding, the use of the rectifier circuit, whether it is required to bring The shell, etc., can be carefully designed and manufactured according to user requirements.


Folding product features
The establishment of a new neutral-grounding in the three-phase transformer can relieve the common mode interference and other neutral problems in the power grid. The three-phase transformer converts the three-wire delta connection into a four-wire Yo system, and shielding further eliminates the high frequency coupled by the transformer. Pulse interference and noise, although the shielded three-phase transformer can effectively prevent various NG interference (pulse and high-frequency noise), but the transformer must be properly grounded, otherwise the anti-common mode interference will be ineffective.

Technical parameters:
Oil-immersed Transformer Diagram

Weight Rreference Table
Conditions of use

1. Applicable altitude: ≤5000m

2.Ambient temperature: -15ºC~+45ºC

3.Relative humidity: ≤90%

4.The installation site should be free of gas, steam, chemical deposits, dirt, conductive dust, and other explosive, flammable, and corrosive substances that seriously affect the insulation strength of the transformer.

5.Anything that does not meet the above conditions of use should be determined through consultation with us

6.It can be carefully designed and manufactured according to user requirements.



Folding application range
Three-phase transformer products are widely used in industrial and mining enterprises, textile machinery, printing and packaging, petrochemicals, schools, shopping malls, elevators, post and telecommunications, medical machinery, office equipment, testing equipment, industrial automation equipment, household appliances, high-rise buildings, machine tools, tunnels Power transmission and distribution, imported equipment and other occasions that require normal voltage guarantee.

Advantages of folding feature
Ø High isolation

Ø Good N-G performance

Ø Highly common mode interference suppression

Ø Convert △ to Y or Y to △

Ø The voltage tap is easy to change

Ø Designed according to user's special performance requirements

Folding technical indicators
1. Input rated voltage: three-phase 380V or single-phase 380V or single-phase 220V

2. Working frequency: 50Hz-60Hz

3. Efficiency: ≥95%

4. Temperature rise: <60

5.Waveform distortion: <0.1%

6. High voltage test: 2500V, no breakdown in 1 minute

Collapse edit this paragraph analysis anatomy
A transformer is a device that transforms AC voltage, current, and impedance. When an AC current is passed through the primary coil, an AC magnetic flux is generated in the iron core (or magnetic core), causing a voltage (or current) to be induced in the secondary coil. With the continuous development of the transformer industry, more and more industries and companies have used transformers, and more and more companies have entered the transformer industry. The transformer is composed of an iron core (or magnetic core) and a coil. There are two or two coils. There are more than one winding, the winding connected to the power supply is called the primary winding, and the remaining windings are called the secondary winding.


Transformer parameter variables
Number of views: Notes on several non-main parameter variables of three-phase transformer parameter variables, three-phase transformer parameter variables

1 Rated power Under frequency and voltage, the characteristics of current transformers indicate parameter variables

2 Rated voltage The voltage agreed upon on the coil of the transformer. The transformer can work for a long time without overwhelming the output power of the temperature rise.

3 Voltage ratio refers to the ratio of the transformer's higher voltage to the secondary voltage, and there is no difference between the no-load voltage ratio and the load voltage ratio.

4 Frequency of work The frequency of transformer core damage and consumption is very related, so when conceived and used according to the frequency of use, that type of frequency is called the frequency of work.

5 Rate refers to the percentage of the ratio of the secondary power P2 to the primary power P1. As long as the rated power of the transformer is larger, the speed is higher. 6 No-load damage refers to the power consumption measured at higher level when the transformer secondary is on. The non-main damage is the core damage, followed by the no-load current on the copper resistance of the primary coil (copper loss), which is small.

6 No-load current The current that is still indeterminate when the secondary of the three-phase transformer is turned on, and that part of the current is called the no-load current. No-load current is composed of magnetizing current (generating magnetic flux) and iron loss current (caused by iron core damage). For a 50Hz current transformer, the no-load current is basically higher than the magnetizing current.

7 Insulation resistance Privately indicate the insulation function between each coil of the transformer and between each coil and the iron core. The unevenness of the insulation resistance is related to the function of the insulating material used, the temperature unevenness and the degree of moisture.

Collapse edit the instructions for this paragraph
1. Transformer connection and connection group

2. The domestic 60kV and 35kV transmission system voltages have two different phase angles.

When the three-phase five-column iron core transformer must be connected with YN, yn0, yn0, there must be a fourth winding connected in an angular connection in the transformer. This example).

The high-voltage windings used in domestic transformers are generally combined into a Y connection, and the connection of the medium-voltage winding and the low-voltage winding depends on the system conditions. The so-called system condition refers to the relationship between the voltage phasor of the high-voltage power transmission system and the voltage phasor of the medium-voltage or low-voltage power transmission system. Such as the low-voltage power distribution system, it can be decided according to the standard.

Collapse edit this paragraph protection equipment
Folding microcomputer protection device
The three-phase transformer microcomputer protection device is composed of high integration, no bus chip single-chip microcomputer, high-precision current and voltage transformer, high-insulation strength export intermediate relay, high-reliability switching power supply module and other components. Microcomputer protection devices are mainly used as power plants, substations, distribution stations, etc. with voltage levels of 110KV and below, and can also be used as protection and monitoring of the voltage and current of the system in voltage levels between 70V and 220V.

Folding differential protection device
The three-phase transformer differential protection device is mainly used to protect transformer equipment. The transformer differential protection device shall be equipped with differential quick-break protection and compound ratio differential protection with or without second harmonic braking. It can be used for three-side differential current input occasions (three-turn change) at the maximum, with voltage to the primary equipment Complete and powerful acquisition functions of current analog and switch values, equipped with standard RS485 and industrial CAN communication ports, and through reasonable configuration to achieve three-loop main transformer differential protection, two-loop main transformer differential protection, and two-loop distribution transformer differential protection , Non-electricity protection and other protection and measurement and control functions.

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