What are the types of step-up transformers and their daily maintenance methods

Step-up transformer is a type of transformer that has the effect of voltage compensation, also known as a transformer compensator. What types of step-up transformers are there? How to perform daily maintenance? In order to improve your understanding of transformers, this article will introduce the types of step-up transformers and their daily maintenance, hoping to provide you with reference and assistance.

1. Introduction to the type of step-up transformer

1. The high-frequency high-frequency step-up transformer uses a high-frequency voltage doubling rectifier circuit, uses the latest PWM pulse width modulation technology and power IGBT equipment, and selects special processes based on electromagnetic compatibility theory to make the DC generator high-quality and portable. The control cabinet and dual voltage equipment are composed of control cabinet and dual voltage equipment components, with built-in maintenance resistors, and have voltage zero gate maintenance, overcurrent, and overvoltage protection functions. It is suitable for on-site DC high-voltage tests of electric power enterprises, DC characteristic tests of lightning arresters, and other places where DC high-voltage is necessary. It is small in size, light in weight, convenient to carry, and safe and reliable.

2. The DC step-up transformer has the characteristics of small size, light weight, compact structure, complete functions, strong practicality, and convenient use. Especially suitable for the insulation strength test of various high-voltage electrical equipment, electrical components, and insulating materials. It is an indispensable and important equipment in high-voltage testing.

Energy saving and low noise: superposed with high-quality cold rolled silicon steel plate; Fully inclined joint; Adopt special processes to effectively reduce vibration and noise during operation; The introduction of new materials, processes, and technologies such as computer optimized design has made transformers more energy efficient and peaceful.

High reliability: Improving product quality and stability will be our unremitting pursuit. A large amount of basic research has been conducted on the quality assurance system and reliability projects, actively certifying stability, further improving the stability and service life of transformers.

Environmental protection features: temperature resistance, moisture resistance, stability, chemical compatibility, low temperature, radiation resistance, non-toxic.

3. AC step-up transformer is a device that changes AC current, current, and impedance. When the primary coil passes through AC current, the iron core (or magnetic core) generates AC magnetic flux, causing the secondary coil to induce voltage (or current). The transformer consists of an iron core (or magnetic core) and a coil. A coil has two or more windings, of which the winding connected to the power supply is referred to as the primary coil, and the remaining windings are referred to as the secondary coil. AC step-up transformer has the characteristics of small size, light weight, compact structure, complete functions, strong practicality, and convenient use. It is particularly suitable for the insulation strength test of high-voltage electrical equipment, electrical components, and insulating materials such as power supply systems, factories, mining enterprises, and scientific research institutions. It is an indispensable and important equipment in high-voltage test.

4. Compared to oil based transformers, dry test step-up transformers have no problems such as fire, explosion, pollution, etc. Therefore, electrical codes and regulations do not require that dry type transformers be placed in a separate room. In particular, the new series has reduced consumption and noise to a new level, creating conditions for placing transformers and low-voltage screens in the same distribution room. The safe operation and service life of transformer winding insulation largely depend on the safety and reliability of transformer windings. The winding temperature exceeds the insulation bearing temperature and the insulation damage is one of the main reasons why the transformer cannot operate normally. Therefore, it is very important to detect the operating humidity of the transformer and report the operation. According to the characteristics of the application environment and protection requirements, dry test step-up transformers can choose different housings. The IP23 protective shell is generally used to prevent the entry of solid foreign objects with a diameter of more than 12mm and small animals such as rats, snakes, cats, and finches, resulting in malignant faults such as short circuit and power failure, providing a safety barrier for live parts. If the transformer must be installed outdoors, an IP23 protective enclosure can be used. In addition to the above IP20 protection function, it can also prevent water from forming a 60 ° drop angle with the vertical line. However, the IP23 enclosure will reduce the cooling capacity of the transformer, and attention should be paid to reducing its operating capacity when using it.

5. Low frequency type Low frequency transformer core magnetic flux related to the applied voltage. The excitation current does not change with the increase of load in the current. Although increasing the load on the iron core will not saturate it, it will increase the resistance loss of the coil, exceeding the short-circuit capacity, because the heat generated by the coil cannot be released in a timely manner, and the coil will be damaged. If the coil is composed of superconducting materials, increasing the current will not cause heat, but there is also leakage impedance inside the transformer. However, as the current increases, the output voltage decreases, and the current increases, the output voltage decreases, and the transformer power cannot be unlimited. If you say that a transformer has no impedance, when a current flows through it, it will generate very large amounts of power, which can easily damage the transformer coil. Although you have an infinite power transformer, you cannot use it. It can only be said that with the development of superconducting materials and iron core materials, the power of transformers with the same volume or weight will increase, but not unlimited.

2、 Routine maintenance of step-up transformer

How should we maintain the step-up transformer during daily use? Please refer to the following:

1. In order to protect the insulation performance of the insulating oil installed on the high-voltage generator and machine head, it is generally not allowed to open the observation window and loosen the surrounding fixing screws at will to avoid moisture or dust on the oil and reduce the insulation performance.

2. Check whether the lighting, heat removal, and dust removal equipment near the transformer are in good condition, and wipe the dust on the transformer body and porcelain bottle with a clean cloth.

3. Check the load switch on the high-voltage side of the transformer, ensure flexible operation, good contact, and lubricate the transmission part.

4. Open the high-voltage grounding switch, check the disconnection position, and then ground it. Cover the high-voltage load switch to make the transformer test run. Take out the high-voltage side sign. Pay attention to disconnecting or covering the high-voltage load switch of the transformer. There must be at least two people on site.

5. When it is necessary to replace the new oil, the assistance of the local power company should be obtained to check the characteristics of the new oil, and the insulation strength should not be less than 25000 volts/2.5mm; The oil insulation strength of the combined machine head should be above 30000 volts/2.5 mm.

6. Use a 2500V megger to measure the insulation resistance (to ground and phase to phase) of the high and low voltage coils of the transformer and ensure that it meets the requirements (at room temperature of 30 ℃, the high voltage side of the 10KV transformer exceeds 20M Ω, and the low voltage side exceeds 13M Ω. Before the test, the grounding wire should be grounded and discharged after the measurement is completed.

7. The high-voltage generator or combined head must have a good grounding wire. Use an ohmmeter to measure whether the housing, console housing, and external ground wires pass through for a long time, and tighten the grounding bolts.

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