| Application: | Power, Electronic, Instrument, Lighting, Rectifier, Audio, Thermal Power, Hydropower,Photovoltaic, Wind Power |
|---|---|
| Phase: | Three |
| Core: | Core-type Transformer |
| Cooling Method: | Dry-type Transformer |
| Winding Type: | Two-winding Transformer |
| Certification: | ISO9001-2000, ISO9001, CCC, CE |
| Samples: |
|---|
| Customization: |
|---|
Suppliers with verified business licenses
Audited Supplier On-load-tap-changing transformer
Product introduction: Transformers equipped with on load tap changers are called on load tap changers. On load tap changer is a type of transformer that leads out several taps from the transformer winding and passes them through the on load tap changer. While ensuring that the load current is not cut off, the tap position is changed and the effective number of turns is changed, that is, the transformer's voltage ratio is changed to achieve the goal of constant output voltage. The energy during the transformation and tapping process is generally absorbed by a transition resistor to limit the circulating current.
The task of a power transformer is to directly supply electricity to the load center, with the primary side directly connected to the main voltage grid (220 kV and above) or to the regional power grid (35-110 kV). This type of transformer not only provides active power to the load, but also often simultaneously provides reactive power, and generally has a larger short-circuit impedance.
As the regional load changes, if there is no on load tap changer installed, the voltage of the power supply bus will change accordingly. Therefore, China's "Technical Guidelines for Power Systems (Trial)" stipulate that "for transformers of 110 kV and below, it is advisable to consider using load voltage regulation for transformers with at least one level of voltage.".
Therefore, for the on load tap changer transformers that directly supply power to the power supply center, under the premise of achieving on-site balance of reactive power zoning, with the increase or decrease of regional load, and in conjunction with the switching of parallel capacitors and low-voltage reactors of reactive power compensation equipment, adjust the tap to ensure the quality of power supply voltage to users at any time.
On load voltage regulating transformers are mainly used for:
A, Stabilize the voltage of the power grid at various load centers to improve power supply quality;
B, As a connecting transformer between two networks, using on load voltage regulation to distribute the load between the networks;
C, A power supply used to regulate current and power with load to improve production efficiency;
D, Used in situations where voltage must be strictly controlled, such as power transformers used in the electronics industry, medicine, and other fields.
On load tap changer is a device used to adjust the output voltage of a power source, commonly used in industrial production and power systems. It adjusts the voltage by changing the number of windings on the input or output side. On load tap changer transformers have unique working principles and differences from no-load tap changer transformers. The following will introduce their working principles and differences from no-load tap changer transformers.
1. Working principle of on load tap changer transformer
The working principle of on load tap changer is based on the relationship between magnetic flux balance and voltage ratio. The following are the basic steps of its working principle:
1.1 Input side winding
The input winding of the on load tap changer is connected to the power supply to provide a fixed input voltage. This winding is usually referred to as the main winding.
1.2 Output side winding
The output winding of the on load tap changer is connected to the load to provide the required output voltage. This winding is usually referred to as a secondary winding.
1.3 Adjusting the winding
The on load tap changer also includes a regulating winding, which can be connected to the main winding or the secondary winding. By applying different voltages to the regulating windings, the magnetic flux ratio between the windings can be changed.
1.4 Magnetic flux balance
In an on load tap changer, the total magnetic flux at the input and output terminals must be balanced. When adjusting the voltage applied to the winding, it will change the magnetic flux relationship between the main winding and the secondary winding, thereby achieving the adjustment of the output voltage.
2. The difference between on load tap changer and off load tap changer
There are some differences in the working principle and application scenarios between on load voltage regulating transformers and off load voltage regulating transformers. The following will compare them:
2.1 Working principle
The output voltage regulation of an on load tap changer is carried out under load conditions by changing the magnetic flux ratio of the input or output winding. The output voltage regulation of the no-load tap changer is carried out in a no-load state by changing the connection method between the windings.
2.2 Adjustment range
Due to the fact that the regulation of on load tap changer is carried out under load conditions, its regulation range is relatively small. The regulation range of no-load voltage regulating transformer is relatively large, and it can achieve significant voltage regulation.
2.3 Stability
On load tap changer transformers have good stability during load changes and can maintain stable output voltage. The stability of no-load voltage regulating transformers is poor when the load changes, and the output voltage is easily affected by the load and fluctuates.
2.4 Application scenarios
Due to its good stability and small adjustment range, on load tap changer transformers are commonly used in scenarios with high load requirements, such as stable voltage regulation of equipment in industrial production processes. On load tap changer transformers are suitable for scenarios that do not require consideration of load changes and require a large voltage regulation range, such as laboratory research equipment and certain testing applications.
2.5 Efficiency
The on load tap changer transformer can more efficiently convert electrical energy under load working conditions, as its winding design is optimized based on specific load conditions. In contrast, the conversion efficiency of no-load voltage regulating transformers is lower under no-load conditions.
2.6 Cost
Due to the need for additional regulating windings to regulate the output voltage of on load tap changer transformers, their manufacturing cost is relatively high. The no-load voltage regulating transformer does not require additional adjustment windings, so the manufacturing cost is relatively low.
In summary, the on load tap changer adjusts the output voltage under load conditions by changing the magnetic flux ratio of the input or output winding. Compared to this, no-load voltage regulating transformers achieve voltage regulation by changing the connection method between windings, which is suitable for scenarios that do not need to consider load changes and require a larger voltage regulation range. There are differences between the two in terms of working principle, adjustment range, stability, application scenarios, efficiency, and cost. According to specific application requirements and load conditions, select the appropriate type of voltage regulating transformer to ensure stable power output and meet the required voltage regulation ability.
The transformer advantages of Shanghai Zhiyou Company:
★ Iron core, low loss, low noise, high strength;
★ All iron cores are made of high magnetic grain oriented cold-rolled silicon steel sheets;
★ All iron cores are equipped with diagonal seams;
★ The iron core has no perforations and is tied with specialized equipment using glass adhesive tape;
★ Iron chip cutting uses German GEORG company's longitudinal and transverse cutting lines for processing;
★ High quality coils and insulation components are the key to ensuring the quality of transformers;
★ Widely using swappable and composite wires to effectively reduce additional losses of coils;
★ Using the impact characteristics of electronic computer coils, select a reasonable coil structure to ensure that the coils have reliable electrical characteristics and impact strength;
Large coils are manufactured in dustproof air conditioning rooms and are widely used with vertical winding machines;
Formed insulation components designed according to the characteristics of electric field distribution have been applied to the insulation structure of transformers.
Shanghai Zhiyou Company, the famous brand in China's transformer industry, will do our best to provide our customers with the most reasonable transformer prices, high-quality services, and detailed technical support.
Performance characteristics
1. High reliability: The temperature control adopts an intelligent temperature controller, which is easy to maintain and improves the safety and reliability of transformer operation. Small partial discharge: The winding is wound with copper wire or copper foil, filled and wrapped with fiberglass felt, and wound with epoxy resin in a vacuum state. After curing, it forms a sturdy cylindrical whole, with small partial discharge and high reliability. Simultaneously flame retardant, explosion-proof, and non polluting to the environment.
2. Strong resistance to sudden short circuits: The high-voltage winding of the product is made of epoxy resin vacuum casting, with small partial discharge and high electrical strength of the coil. The inner and outer walls of the winding are made of fiberglass mesh plates, which increases the mechanical strength of the coil and improves the product's ability to resist sudden short circuits.
3. Low cost: The iron core is made of imported high-quality cold-rolled silicon steel sheets, with a three-stage fully inclined seam structure. The surface is coated with epoxy resin, reducing no-load loss, no-load current, and iron core noise.
4. Strong short-circuit resistance: The high-voltage winding of the product is made of epoxy resin vacuum casting, with small partial discharge and high electrical strength of the coil. The inner and outer walls of the winding are made of fiberglass mesh plates, which increases the mechanical strength of the coil and improves the product's short-circuit resistance.
5. Good thermal stability: The coil and lead wire are made of copper wire, and axial air ducts are added inside the coil, leaving sufficient temperature rise margin. The heating part and the hottest spot of the product are strictly controlled for temperature rise, and the main temperature rise indicators of the product are at least 5 degrees lower than those of international standards.
6. Low temperature rise, long service life: The product has low temperature rise, strong heat dissipation ability, and can operate at 150% of rated load under forced air cooling conditions. An optional temperature control and protection system with comprehensive performance can provide reliable guarantee for the safe operation of transformers.
7. Maintenance free: Dry type transformers have no oil, and 1250kva dry-type transformers are reasonably priced, eliminating the need for regular oil changes and maintenance of the product.
8. Beautiful appearance: The core column of the product is tied with F-grade weft free straps, and the surface of the clamps and fasteners is specially treated to make the product more beautiful.
Usage environment
1. Installation location: indoor;
2. Altitude: less than 1000 meters (special design is required when it is greater than 1000 meters);
3. Environmental temperature: -25 ºC~+40 ºC;
4. The waveform of the power supply voltage is approximately a sine wave; The three-phase power supply voltage is roughly symmetrical;
5. Maximum relative humidity: 95% (25 ºC);
6. Seismic resistance: Ground horizontal acceleration of 0.3g, ground vertical acceleration of 0.15g, simultaneously acting for three sine waves, with a safety factor of ≥ 1.67;
7. Ability to work normally in indoor environments around the clock;
8. Workplace: No fire, explosion hazard, chemical corrosion level severe vibration environment.
For both air-cooled and forced air-cooled transformers, it is necessary to ensure that the transformer has good ventilation capacity. When transformers are installed in basements or other environments with poor ventilation capacity, heat dissipation and ventilation devices must be added. Protection levels include IP00, IP20, IP23, and other types.
When the altitude is greater than 1000 meters or the ambient temperature is greater than 40 ºC or less than -25 ºC, the product must adjust the relevant rated values in accordance with the requirements of GB1094.11 Power Transformers - Part 11: Dry type Transformers.
Product Standard
GB1094.1-2013 Power Transformers Part 1 General Principles;
GB1094.2-2013 Power Transformers - Part 2: Temperature Rise;
GB1094.3-2017 "Power Transformers - Part 3: Insulation Levels, Insulation Tests, and External Insulation Air Clearances";
GB1094.5-2016 Power Transformers - Part 5: Ability to withstand short circuits;
GB1094.10-2003 Power Transformers - Part 10: Sound Level Identification;
GB1094.11-2007 Power Transformers - Part 11: Dry type Transformers;
GB20052-2013 "Limiting Values and Energy Efficiency Grades for Energy Efficiency of Three Phase Distribution Transformers";
IEC60076-11-2016 Dry type Transformers
Shanghai Zhiyou Electric Manufacturing Co., Ltd. is currently seeking globally trusted partners as our agents in various regions. If you trust our products, please contact us through Made in China website or directly by email. We will reply to you as soon as we receive the information.
On-load-tap-changing transformer(oil-immersed):
Shanghai Zhiyou Company is not only a leading enterprise in the dry type power transformer industry, but also a professional manufacturer of oil type power transformers and power reactors.
Oil type power transformer:
Reactor:
Shanghai Zhiyou Electric Manufacturing Co., Ltd., established in 2007, is a professional manufacturer of power plant transformers in China and a leading large-scale manufacturer of transformers in China. Shanghai Zhiyou has obtained ISO9001 international quality management system certification, ISO14001 international environmental management system certification, and EU CE certification, and has independent patents and trademarks.Corporate honor, awarded as a "Famous Brand in China" by the authoritative organization China Enterprise Quality Certification and Supervision Center. The quality of the products produced by the company is reliable, and the product standards are in line with or higher than the Chinese national standards and international general standards. They are highly praised by the Chinese and international markets.
Shanghai Zhiyou Company, the famous brand in China's transformer industry, will do our best to provide our customers with the most reasonable transformer prices, high-quality services, and detailed technical support.
Our Best Service For You
1. Pre sale service
a. make technical solution
b. send quotation, technical data sheet and drawing
c. prepare power transformer plan, testing plan and shipment plan
2. In sale service
a. supervise the manufacturing schedule totally in accordance with the plan
b. send photos to customer during every manufacturing process(hold point)
c. inform the customer one week before testing.
3. After sale service
a. installation and commissioning, training the workers
b. quick response within 12 hours any time
c. provide 12 months guarantee period normally.
Q1: Are you a factory or trading company?
A1: We are a factory, and we can guarantee our price is first-hand very cheap and competitive. Our factory is in Shanghai, the international metropolis of China.
Q2: What is the payment term?
A2: T/T, L/C or negotiation.We accept T/T 30% deposit and 70% balance payment, the balance should be paid after acceptance before shipment.
Q3: Do you have any Certificate?
A3: Yes. Our transformers have CE certificates, type test reports tested by national authoritative institutions, and certificates of conformity.
Q4: Could I have the prices of your products?
A4: Welcome. Please feel free to send us an inquiry here. We will reply to you within 24 hours.
Q5: How about the delivery time?
A5: My friends, when you confirm the order, there will be about 25 to 45 days to produce which depends on your delivery plan and our order arrangements.
Q6: May I know the warranty time?
A6. We offer 12 months warranty time for the transformer quality. For any questions about our products, you can consult our sales manager any time and anywhere. We will provide the professional assistance to you.
Q7: Do you accept product customization?
A7: Yes of course. Please provide specific drawings or parameters we will quote you after evaluation.
Q8: Would you accept using customer's logo?
A8: Yes, we can provide OEM and ODM service.
Q9: What is the standard of package?
A9: Export standard package or special package according to customer's requirement.
Q10: How can we trust you?
A10: As an enterprise specializing in transformer production for 17 years, Shanghai Zhiyou Electric has high quality, fast delivery, guarantee after-sales service and factory price.We have more than 17 years manufacturing and R&D experience, and cooperated with many customers all over the world. We have many patent certificates, test report, ISO9001, ISO14000 certificate. We are the audited supplier of Made-In-China.
Q11: How do you conduct quality control in your factory?
A11: Shanghai Zhiyou Electric transformers are manufactured in accordance with international standards (such as IEC, SGS, Intertek, CE and other international certifications) and customer requirements . All transformers are 100% conducted routine test, type test and special test before delivery to ensure every product is qualified.
Q12: I have great trust in Shanghai Zhiyou's transformer products and would like to become your company's general agent in our country. How can I proceed?
A12: Thank you for your recognition of Shanghai Zhiyou Company's products. Shanghai Zhiyou Electric Manufacturing Co., Ltd. is currently seeking globally trusted partners as our agents in various regions. Please contact us through Made in China website or directly by email. We will reply to you as soon as we receive the information.
Suppliers with verified business licenses
Audited Supplier 
){kind=link}
){kind=link}