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  • Regulators address voltage instability

    Regulators address voltage instability

    Voltage regulators are essential for stabilizing voltage-type electrical equipment, which has also prompted us to develop more advanced voltage regulators to meet the needs of equipment. Let's understand how important the voltage regulator is: the role of the voltage regulator is to stabilize the voltage. Unstable voltage can cause delayed production of the equipment, cause delays in delivery, and differences in production quality. It is a loss of reputation and even fatal injuries. It also accelerates the aging of the equipment at the same time, which will affect the service life of its equipment and even the damage of its accessories. This in turn will face the need for maintenance or update the equipment in a short period of time; in serious cases, it may Cause safety accidents and cause huge losses.
  • How to improve the accuracy of voltage transformers

    How to improve the accuracy of voltage transformers

    In practical use, the voltage-regulating transformer cannot meet the accuracy range of some high-end users after transformation. The wide accuracy range is a major problem for voltage-regulation accuracy. Voltage-regulating transformers are also known as auto-coupled voltage regulators, which are divided into single-phase and three-phase. They have the functions of independent voltage regulation and voltage transformation. Hereinafter referred to as voltage regulators, the accuracy range of traditional voltage regulators is between 1-5%, the range is too Broad, unable to locate the exact required voltage, and cannot meet the needs of customers. In order to improve the output accuracy of the voltage regulator, the imported voltage regulator chip combined with the rotary scale adjustment technology was introduced, and the output voltage could reach 1%. The accuracy of the output accuracy has been greatly improved. The newly developed voltage regulator has also been improved in volume. The volume is 3% smaller than the original volume, although it is not very large, but it will be more beautiful and applicable overall!
  • Working principle and wiring method of three-phase transformer

    Working principle and wiring method of three-phase transformer

    A three-phase dry-type transformer is a combination of three single-phase transformers of the same capacity. It has three iron core columns, each of which is wound around two coils of the same phase, one is a high-voltage coil and the other is a low-voltage coil. Coherent transformers are transformers commonly used in the power industry. Transformer connection and connection group: High-voltage windings used in domestic transformers are generally connected into a Y-connection. The connection of medium-voltage windings and low-voltage windings depends on the system. The so-called system situation refers to the relationship between the voltage phasor of the high-voltage transmission system and the voltage phasor of the medium-voltage or low-voltage transmission system. For low-voltage distribution system, it can be decided according to the standard. The voltage phasors of domestic transmission systems of 500, 330, 220 and 110kV are all in phase. Therefore, for three-phase three-winding or three-phase autotransformers with the following voltage ratios, high-voltage and medium-voltage windings must be star-shaped. Connection. In the case of a three-phase three-core column core structure, the low-voltage winding can also adopt a star connection or an angular connection method, which depends on whether the voltage phasor of the low-voltage power transmission system is in phase or lagging with that of the medium-voltage and high-voltage power transmission 30 & deg; electrical angle. 500/220 / LVkV─YN, yn0, yn0 or YN, yn0, d11 220/110 / LVkV─YN, yn0, yn0 or YN, yn0, d11 330/220 / LVkV─YN, yn0, yn0 or YN, yn0, d11 330/110 / LVkV─YN, yn0, yn0 or YN, yn0, d11 Domestic 60 and 35kV transmission system voltages have two different phase angles. For example, the 220 / 60kV transformer uses YNd11 connection, and the 220/69 / 10kV transformer uses YN, yn0, d11 connection. The two 60kV power transmission systems differ by 30 & deg; electrical angle. When 220/110 / 35kV transformers are connected with YN, yn0, d11, and 110/35 / 10kV transformers are connected with YN, yn0, d11, the voltage phasors of the two 35kV transmission systems also differ by 30 & deg; electrical angle. Therefore, care must be taken when deciding the connection of 60 and 35kV windings, and the connection must meet the requirements of the voltage phasor of the transmission system. According to the relative relationship of voltage phasor, the connection method of 60 and 35kV level windings is determined. Otherwise, even if the capacity and voltage ratio are correct, the transformer cannot be used, the connection method is incorrect, and the transformer cannot be connected to the transmission system. Domestic 10, 6, 3 and 0.4kV phasors of transmission and distribution systems also have two phases. In Shanghai, there is a 60 & deg; electrical angle between the voltage phasor of 10kV and 110kV transmission systems. At this time, a three-phase three-winding power transformer with a voltage ratio of 110/35 / 10kV and YN, yn0, and y10 can be used. Three-phase three-core core type iron core. However, it should be noted that when a single-phase transformer is connected into a three-phase group connection method, a three-phase group with YNy0 connection method cannot be used. Three-phase shell-type transformers cannot be connected with YNy0. The three-phase five-column iron core transformer must use YN, yn0, yn0 connection. There must be an angled fourth winding in the transformer. It does not lead out (the structure does not lead out when the electrical test is to be performed on the structure. This example). When transformers of different connection groups are operated in parallel, the general rule is that the numbers of the connection groups must be the same. When the distribution transformer is used in the mine area, the Yzn11 connection can be used. When the z connection is used, the impedance voltage algorithm is different from the Yyn0 connection. At the same time, the copper consumption of the z connection winding is more. The lightning protection performance of Yzn11 connected distribution transformer is better. The three-phase transformer cannot use the YNy0 connection method when using four rolled core frames. The above are used for domestic transformer connection. For export, appropriate connection methods and connection group numbers should be provided according to requirements. Generally, there are taps and tap changers connected in the high-voltage winding. Therefore, when selecting a tap-changer (including on-load tap-changer and non-excitation tap-changer), you must pay attention to the transformer connection and tap-changer connection (including connection method, test voltage, rated current, each Level voltage, voltage regulation range, etc.). For the on-load tap-changer used in the on-load voltage-regulating transformer of the YN connection method, it should also be noted that the midpoint must be able to lead out.
  • Selection and usefulness of power regulator

    Selection and usefulness of power regulator

    The power voltage regulator is a voltage regulating power supply that can adjust the voltage to the load. It can call up a variety of power supply voltages suitable for electrical equipment. Therefore, with the development of the power system, the improvement of the voltage level and the increase of the transmission capacity, the power supply voltage regulator is widely used due to the small loss and low cost. So how do we choose the power regulator that suits us? It is mainly determined by the following three points. 1. Voltage range: The voltage range should meet the needs of the load equipment. 2. Rated capacity: The capacity of the power supply regulator should be higher than the total capacity of the load, especially the inductive load and the capacitive load must leave the shock margin at startup, under normal circumstances it is 30- 40%. For example, if a capacity of 40KVA is required, and it is an ordinary purely resistive load, we can choose a power regulator of 45KVA. If it is an inductive load or a capacitive load, a power regulator of 60KVA or more is used. 3. Rated current: The rated current of the power supply regulator is the current that is higher than the working voltage of the load. If it is an inductive load or a capacitive load, a 30% margin should be left. So how can power regulators work? With China's economic development, the demand for resources will continue to increase. The rational use of resources and the avoidance of waste have become an indispensable part of our lives. This is even more important for businesses. Many enterprises may have such distress. There are many types of equipment that have different power supply voltages and are inconsistent with the grid voltage. It is too expensive to allocate transformers one by one, and these equipments are not often used. Not only are they not often used, but also It is especially wasteful to maintain it often. With such distress, you may choose a power supply voltage regulator to solve this series of problems, because the power supply voltage regulator has this magical function, because its feature "voltage regulation" can meet the needs of different power supply voltage equipment. And it is easy to move and easy to maintain. * Mainly it can be used for one machine and avoid waste. It is a very good choice.
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  • 08
    08

    Development of Transformer Dynamic Force and Vibration Calculation Program

    The natural oscillation frequency of the winding depends to a large extent on the degree of compaction after the equipment, because the elastic modulus of insulation is related to this. The tighter the compression, the higher the natural oscillation frequency of the winding. Therefore, increasing the pressing force may increase or decrease the dynamic force, which is related to whether the natural frequency is close to or far from the forced oscillation frequency. Until now, domestic and foreign operating practices have proved that the dynamic and stability damage caused by short-circuits in transformers has a certain relationship with the calculation of electric force and calibration strength according to the static method during design. It may be precisely for this reason that The development of research on dynamic force calculation methods and transformer vibration calculation has been continuously developed. At present, in the design of small and medium-sized transformers in China, the static force is generally used to calculate the electric force and the strength is checked, but this problem is not large. For the design of large-capacity transformers, some transformer manufacturers have introduced programs based on dynamic force calculations from abroad, and relatively similar programs have been studied in China. It seems that good results have been achieved, but these are patents. However, it also shows that China also has good results in the calculation of transformer dynamic force and vibration.
  • 08
    08

    Selection and usefulness of power regulator

    The power voltage regulator is a voltage regulating power supply that can adjust the voltage to the load. It can call up a variety of power supply voltages suitable for electrical equipment. Therefore, with the development of the power system, the improvement of the voltage level and the increase of the transmission capacity, the power supply voltage regulator is widely used due to the small loss and low cost. So how do we choose the power regulator that suits us? It is mainly determined by the following three points. 1. Voltage range: The voltage range should meet the needs of the load equipment. 2. Rated capacity: The capacity of the power supply regulator should be higher than the total capacity of the load, especially the inductive load and the capacitive load must leave the shock margin at startup, under normal circumstances it is 30- 40%. For example, if a capacity of 40KVA is required, and it is an ordinary purely resistive load, we can choose a power regulator of 45KVA. If it is an inductive load or a capacitive load, a power regulator of 60KVA or more is used. 3. Rated current: The rated current of the power supply regulator is the current that is higher than the working voltage of the load. If it is an inductive load or a capacitive load, a 30% margin should be left. So how can power regulators work? With China's economic development, the demand for resources will continue to increase. The rational use of resources and the avoidance of waste have become an indispensable part of our lives. This is even more important for businesses. Many enterprises may have such distress. There are many types of equipment that have different power supply voltages and are inconsistent with the grid voltage. It is too expensive to allocate transformers one by one, and these equipments are not often used. Not only are they not often used, but also It is especially wasteful to maintain it often. With such distress, you may choose a power supply voltage regulator to solve this series of problems, because the power supply voltage regulator has this magical function, because its feature "voltage regulation" can meet the needs of different power supply voltage equipment. And it is easy to move and easy to maintain. * Mainly it can be used for one machine and avoid waste. It is a very good choice.
  • 08
    08

    Working principle and wiring method of three-phase transformer

    A three-phase dry-type transformer is a combination of three single-phase transformers of the same capacity. It has three iron core columns, each of which is wound around two coils of the same phase, one is a high-voltage coil and the other is a low-voltage coil. Coherent transformers are transformers commonly used in the power industry. Transformer connection and connection group: High-voltage windings used in domestic transformers are generally connected into a Y-connection. The connection of medium-voltage windings and low-voltage windings depends on the system. The so-called system situation refers to the relationship between the voltage phasor of the high-voltage transmission system and the voltage phasor of the medium-voltage or low-voltage transmission system. For low-voltage distribution system, it can be decided according to the standard. The voltage phasors of domestic transmission systems of 500, 330, 220 and 110kV are all in phase. Therefore, for three-phase three-winding or three-phase autotransformers with the following voltage ratios, high-voltage and medium-voltage windings must be star-shaped. Connection. In the case of a three-phase three-core column core structure, the low-voltage winding can also adopt a star connection or an angular connection method, which depends on whether the voltage phasor of the low-voltage power transmission system is in phase or lagging with that of the medium-voltage and high-voltage power transmission 30 & deg; electrical angle. 500/220 / LVkV─YN, yn0, yn0 or YN, yn0, d11 220/110 / LVkV─YN, yn0, yn0 or YN, yn0, d11 330/220 / LVkV─YN, yn0, yn0 or YN, yn0, d11 330/110 / LVkV─YN, yn0, yn0 or YN, yn0, d11 Domestic 60 and 35kV transmission system voltages have two different phase angles. For example, the 220 / 60kV transformer uses YNd11 connection, and the 220/69 / 10kV transformer uses YN, yn0, d11 connection. The two 60kV power transmission systems differ by 30 & deg; electrical angle. When 220/110 / 35kV transformers are connected with YN, yn0, d11, and 110/35 / 10kV transformers are connected with YN, yn0, d11, the voltage phasors of the two 35kV transmission systems also differ by 30 & deg; electrical angle. Therefore, care must be taken when deciding the connection of 60 and 35kV windings, and the connection must meet the requirements of the voltage phasor of the transmission system. According to the relative relationship of voltage phasor, the connection method of 60 and 35kV level windings is determined. Otherwise, even if the capacity and voltage ratio are correct, the transformer cannot be used, the connection method is incorrect, and the transformer cannot be connected to the transmission system. Domestic 10, 6, 3 and 0.4kV phasors of transmission and distribution systems also have two phases. In Shanghai, there is a 60 & deg; electrical angle between the voltage phasor of 10kV and 110kV transmission systems. At this time, a three-phase three-winding power transformer with a voltage ratio of 110/35 / 10kV and YN, yn0, and y10 can be used. Three-phase three-core core type iron core. However, it should be noted that when a single-phase transformer is connected into a three-phase group connection method, a three-phase group with YNy0 connection method cannot be used. Three-phase shell-type transformers cannot be connected with YNy0. The three-phase five-column iron core transformer must use YN, yn0, yn0 connection. There must be an angled fourth winding in the transformer. It does not lead out (the structure does not lead out when the electrical test is to be performed on the structure. This example). When transformers of different connection groups are operated in parallel, the general rule is that the numbers of the connection groups must be the same. When the distribution transformer is used in the mine area, the Yzn11 connection can be used. When the z connection is used, the impedance voltage algorithm is different from the Yyn0 connection. At the same time, the copper consumption of the z connection winding is more. The lightning protection performance of Yzn11 connected distribution transformer is better. The three-phase transformer cannot use the YNy0 connection method when using four rolled core frames. The above are used for domestic transformer connection. For export, appropriate connection methods and connection group numbers should be provided according to requirements. Generally, there are taps and tap changers connected in the high-voltage winding. Therefore, when selecting a tap-changer (including on-load tap-changer and non-excitation tap-changer), you must pay attention to the transformer connection and tap-changer connection (including connection method, test voltage, rated current, each Level voltage, voltage regulation range, etc.). For the on-load tap-changer used in the on-load voltage-regulating transformer of the YN connection method, it should also be noted that the midpoint must be able to lead out.
  • 08
    08

    Summer is here. Is the regulator for your air conditioner right?

    Summer is here. Is the regulator for your air conditioner right? When talking about this, you will definitely look at your own regulator, because we will use it soon! Everyone knows that summer is the peak power consumption. In many places, because the line has not been modified, the external network voltage is low, and the air conditioner cannot start normally. At this time, I thought of having a regulated power supply. Then the question came, how to buy an air conditioner regulator? Let's analyze and explain the following for you, I hope to help you solve the problem. 1. Calculate the power of the voltage regulator: The main load of the air conditioner is the compressor, so it belongs to the motor type load. The electric current is very large when the motor is started instantaneously. Although many air conditioners are now started by variable frequency, the current is still very high at startup If the air conditioner is 2KW, the regulator ** will be equipped with a 6KW regulator according to 3 times the power. How to calculate the power of the air conditioner, the general air conditioner has 1P, 1.5P, 2P, 3P, 1P = 0.75KW, everyone can follow this calculation. 2. The power factor of the regulator. At present, 80% of the regulators on the market are 0.7, and 20% of the regulators have a power factor of 0.8. What does it mean? It is a 10KVA voltage regulator, the actual output power x 0.7 = 7KW3. Most of the time when using the voltage regulator in the summer is due to the low external network voltage, so when choosing a voltage regulator, pay attention to leaving a working margin, and generally the actual load Do not exceed 80% of the power of the regulator, why? Let's calculate it. When the external network voltage is 220V: 6000W / 220V = 27A (current), when the external network voltage is 170V: 6000W / 170V = 35.3A (current). After comparison, we can see that the current is low when the input voltage is low The larger the wire diameter of the transformer inside the regulator is, the more current it will bear at low voltage. 4. Calculate according to the above method: 2KW air conditioner X2 times = 4KW, where the air conditioning power multiplied by 2 is because the instantaneous startup current of the compressor of the air conditioner is large; 4KW / 0.8 = 5KVA (voltage regulator power), divided by 0.8 here is a stable The working margin of the voltage regulator is 5KVA / 0.8 = 6.25KVA (the power of the regulator to be purchased), divided by 0.8 here, the actual load capacity of the regulator is only 80%. That is, 2KW air conditioner with 6KVA regulator is calculated like this.
  • 08
    08

    Analysis of anti-interference measures of AC voltage regulator

    All switching input and output ports of the inverter are isolated by photocouplers. In addition to the photocoupler isolation of the trigger pulse output circuit of the thyristor, transformer isolation is also used to prevent reverse interference of the higher voltage of the main circuit. 01 circuit is also used to improve its anti-interference ability. In order to ensure the normal operation of the microcomputer floating ground, the ground wire of the analog input port should also be isolated from the microcomputer ground wire. Although isolating amplifiers can be used to isolate the internal and external ground wires, because this type of amplifier module uses transformer coupling technology, its anti-interference ability is limited. During the test, it was found that narrow peak pulse interference can penetrate into the sampling and conversion circuit of the computer, causing Control errors. For this reason, before the analog quantity is converted into a digital quantity, before entering the microcomputer, each digital quantity is isolated by a photocoupler. Because the photocoupler is a current-type device, it has a better suppression effect on narrow spike pulse interference signals, and can obtain better anti-interference ability and higher conversion accuracy. Power supply anti-interference: The power supply of the microcomputer uses the power supply method of ferromagnetic AC voltage stabilizer, super isolation transformer, two-wire low-pass filter, and anti-interference type microcomputer-based switching power supply. Tests show that this system has very good anti-interference performance, which can ensure that the microcomputer is not affected by AC power. Mutual interference. Other anti-interference measures include: filter network for signal input, digital filter program, trap program, use of integrated circuit, separate wiring of power line and control line, shielded line of microcomputer signal line, etc.
  • 08
    08

    Several domestic non-contact voltage regulators

    We talked about a lot of high-power voltage regulators before, I believe everyone knows them. Today we will talk about several common non-contact voltage regulators in China! There are several non-contact voltage regulators commonly used in China: ① Ferromagnetic resonance AC voltage regulator: an AC voltage regulator made of a combination of a saturation choke and a corresponding capacitor with constant voltage volt-ampere characteristics The magnetic saturation type is a typical early structure of this regulator. It has simple structure, convenient manufacturing, wide input voltage allowable range, reliable operation, and strong overload capacity. However, the waveform distortion is large and the stability is not high. The voltage stabilizer developed in recent years is also a power supply device that realizes the voltage stabilization function by virtue of the nonlinearity of electromagnetic components. It differs from magnetic saturation regulators in that the magnetic circuit structure is different, and the basic working principle is the same. It achieves the dual functions of voltage regulation and voltage transformation on one iron core, so it is superior to ordinary power transformers and magnetic saturation regulators. ② Magnetic amplifier type AC voltage stabilizer: A device that connects a magnetic amplifier and an autotransformer in series and uses electronic circuits to change the impedance of the magnetic amplifier to stabilize the output voltage. Its circuit form can be linear amplification or pulse width modulation. This type of regulator has a closed-loop system with feedback control, so it has high stability and good output waveform. However, due to the use of a magnetic amplifier with large inertia, the recovery time is longer. Due to the use of self-coupling, the anti-interference ability is poor. ③ Inductive AC voltage stabilizer: A device that stabilizes the output AC voltage by changing the phase difference between the secondary voltage of the transformer and the primary voltage. It is similar in structure to a wound asynchronous motor, and in principle is similar to an induction voltage regulator. It has a wide voltage stabilization range, good output voltage waveform, and power can reach hundreds of kilowatts. However, because the rotor is often locked, the power consumption is large and the efficiency is low. In addition, due to the large amount of copper and iron materials, less production. ④ Thyristor AC regulator: AC regulator using thyristor as power adjustment element. It has the advantages of high stability, fast response and no noise. However, it causes interference to the communication equipment and electronic equipment due to the damage to the mains waveform. ⑤ Stable frequency power supply: Stable frequency power supply is the introduction of German advanced technology in China, mainly for remote areas or domestic and foreign power grid voltage, frequency fluctuation range, unstable power supply frequency, serious voltage distortion, or flicker, drop And other comprehensive voltage quality issues. This power supply can stabilize the frequency of the power grid, stabilize the voltage, and output high-quality source voltage and frequency according to customer requirements. The frequency-stabilized power supply adopts IGBT / PWM method, small size and low noise. It adopts digital frequency division, phase-locking, and instantaneous waveform feedback technology, which is stable and accurate. Using high-density digital waveform synthesis, low distortion and good waveform.
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