What is the transformer no-load voltage regulation and on-load voltage regulation _ What is the difference?

2019-04-30 10:56:12 JUKE CHINA ODM OEM Transformer factory Read

What is the transformer no-load voltage regulation and on-load voltage regulation _ What is the difference?

Transformer voltage regulation is to adjust the number of turns of the coil to adjust the output voltage by adjusting the tap of one side of the transformer (generally high voltage coil, small current) through the voltage regulating switch (drop switch). Transformer voltage regulation is divided into two types: no-load voltage regulation and on-load voltage regulation.

Unloaded voltage regulation is to first disconnect the power supply of the transformer, then adjust the tap changer, and then connect the power supply to make the transformer work normally. The on-load voltage regulation means that the power supply is not disconnected, and the transformer is under normal working condition, and the load tapping switch is adjusted. This paper firstly introduces the no-load voltage regulation and on-load voltage regulating transformer. Secondly, it introduces the characteristics and working principle of transformer on-load voltage regulation. Finally, it explains the difference between transformer no-load voltage regulation and on-load voltage regulation.
Introduction to no-load voltage regulating transformer.jpg

Introduction to no-load voltage regulating transformer

The non-excitation voltage regulation refers to the no-load voltage regulation, and the voltage can be adjusted when the transformer is not charged.

Low-loss non-excitation voltage regulating transformer and three-phase on-load voltage regulating transformer (dry type transformer) refer to the transformer tap changer voltage regulation mode. The difference is that the low loss non-excitation voltage regulating transformer pressure switch does not have the load switching gear position. The ability, because this tap changer has a short-time disconnection process during the shift position, disconnecting the load current will cause the arc between the contacts to burn out the tap changer or short circuit, so the transformer must be powered off when shifting . Therefore, it is generally used for transformers that do not require strict voltage requirements and do not require frequent shifting. The three-phase on-load tap-changer tap changer can be switched with load, because there is no short-time disconnection process during the shifting process of the on-load tap-changer, after a transitional resistance transition, from one gear to The other gear position, and thus there is no arcing process in which the load current is disconnected.
Introduction to no-load voltage regulating transformer.jpg

Introduction to on-load tap changer

The transformer has an impedance that will produce a voltage drop during power transfer and will vary as the user side load changes. Fluctuations in the system voltage plus changes in the load on the user side will cause large voltage variations. Under the premise of realizing the balance of reactive power, when the voltage fluctuation exceeds the fixed value, the on-load tap changer will operate after a certain delay, adjust the voltage, and keep the voltage stable.
Transformer on-load voltage regulation
Introduction to on-load tap changer.jpg

1 The pressure regulation range is large, generally ±10%;

2 The speed regulation speed is fast (only 4~5s is required to complete the 1st level voltage regulation, and the load conversion only needs 40~50ms), which has the ability to adjust at any time;

3OLTC can be operated manually or electrically, and can also be remotely operated by electric operation or automatically regulated to facilitate automatic management;

4OLTC is widely used in industrial transformers such as high and medium voltage power transformers, electric furnaces and electrolysis.

The principle of transformer on-load voltage regulation

The high-voltage winding terminal of the transformer is separated by some wires, and the power is connected to different taps. The actual number of turns of the high-voltage winding is different, and the number of turns of the low-voltage winding is fixed, so that the number of high-voltage winding turns is changed. And the constant number of low-voltage winding turns constitute different changes. According to the principle of transformer transformer, the low-voltage winding can be changed with different taps of the high-voltage winding to change different voltages;

The tap of the high-voltage winding can be measured at the power supply of the coil or at the center, which does not change its basic principle. Therefore, the transformer below 220KV is generally set in the power supply measurement, and the tap of the higher voltage transformer is set in the center of the high voltage winding;

The transformers are usually tapped, and the voltage is adjusted according to the actual voltage. However, the unloaded voltage regulation accounts for the majority, and the voltage changes in the main general areas are not so frequent and large, and can be adjusted from time to time.

However, in some places, the voltage requirements are strict, and in some places, the voltage often changes, and it is necessary to use on-load voltage regulation.
The difference between transformer no-load voltage regulation and on-load voltage regulation

The difference is that the unloaded regulator switch does not have the ability to load shift gears, and the transformer must be powered off when shifting. The on-load tap-changer can be switched with load.

The unloaded voltage-regulating transformer must adjust the tap of its high-voltage winding in the event of a power failure, thereby changing the transformer's ratio to achieve the purpose of regulating the low-voltage side voltage. The pressure regulation range is small, generally within ±5%. It can only be adjusted 1-2 times a year, and most of the transformers widely used in power systems are unloaded voltage regulating transformers.

The on-load tap-changer has a dedicated tap changer that can be used to change the tap position without power failure (with load). The pressure regulation range is relatively large, generally 15% or even up to 30%, and can be adjusted several times in a day according to the change of the load size, and can be automatically adjusted.


Hello everyone, I am Dongguan Juke Industry Development Co., Ltd., our company is a supplier of transformer automation production equipment.Our company is a transformer factory specializing in the production of transformers. If you need to purchase or customize transformer automation production equipment, you can contact our business staff to purchase or customize. The following is the company introduction of our company and some products produced by our company. If you need to buy or customize, you can contact us, thank you.

Dongguan Juke Industrial Development Co., Ltd. is a professional automation workshop production line solution provider for high frequency transformer peripheral equipment.

Juke Industry is dominated by Taiwanese technology, and all raw materials are selected and processed in strict accordance with Taiwan Standard Huai, and with the excellent technology and professional services to create maximum value for customers, and determined to become the world's high-frequency transformer automation equipment program The leading brand.
Juke Industry adheres to European standards, and its product series include: transformer automatic inserter, e-transformer EI inserter, transformer core inserter, transformer automatic casing machine, transformer automatic core assembly machine, (automatic magnetic Core assembly + bag tape + test + wobble plate), transformer core assembly rubber wrap machine, transformer automatic winding machine, CNC winding machine, CNC coil winding machine, single-axis winding machine, double-axis winding machine, Multi-axis winding machine, 12-axis automatic winding machine, automatic winding + tape machine, (USB charger automatic film wrapping machine), automatic rubberizing machine, semi-automatic tape dispenser, vacuum impregnation machine, (single Double cylinder difference), transformer automatic flip soldering machine, automatic soldering machine and semi-automatic soldering machine (also called flip soldering machine), magnetic ring inductor automatic foot machine, infrared tunnel furnace, ultraviolet curing oven, baking line, etc. Frequency transformer peripheral automation equipment, products are widely used in high and low frequency transformers, ballasts and motor manufacturers. In order to meet the needs of the market, in 2008, in Yixiu District, Anqing City, Anhui Province, a group of professional and technical personnel to provide quality services to customers.

If you need to customize or purchase the above-mentioned products, you need to purchase or customize our transformer automatic production equipment. You can contact our business staff for purchase or customization. The following is the contact information of our business staff. If necessary, you can contact We, thank you.

Contact information of Giant Business staff
Phone: 18819603799
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Email:3407993243@qq.com
Manufacturer Tel: 0769-89870552
Company Name: Dongguan Juke Industrial Development Co., Ltd.
Company website: http://tc.huiyuecn.com
Address: Room 406, 4th Floor, Jupiter Industrial Park, Jufeng, No. 53 Shangnan Road, Shangjiao Community, Chang'an Town, Dongguan City