The existence of the three-phase voltage regulator is due to the relatively large fluctuations in the grid voltage, and these fluctuations will seriously affect the normal operation and service life of the electrical equipment, and also affect the quality of the product, especially for machinery, scientific research, The enterprises or enterprises with higher automation degree such as CNC machinery have a greater impact. To reduce the impact, three-phase voltage stabilizers have been produced to stabilize the AC voltage and effectively solve the shortage of voltage regulation intermittent oscillation compensation and voltage regulation interference.
The three-phase compensation type full-automatic voltage regulator and the three-phase non-contact voltage regulator are all fully automatic design, with warning and protection functions such as overvoltage and overload. The three-phase voltage regulator produced by the general company has full specifications, rich varieties, streamlined appearance, simple and elegant design, safe and reliable performance, long-term uninterrupted operation, and features such as over-voltage protection. It can be added according to the actual needs of customers. Various self-set functions such as Under-voltage and delay protection. If there is a situation where the three-phase automatic voltage regulator is not stabilized, the main reason is that the unbalanced current is too large, followed by the stray current flowing through the PE line. It is recommended to find the cause of the fault of the neutral line first.
The voltage regulator is also called AVR (Automatic Voltage Regulator). The use of voltage regulators is not limited to house/office equipment that receives power from the outside. Even ships with their internal power supply in the form of diesel generators rely heavily on these AVRs to ensure the safety of their equipment. Regulators are very energy-saving devices (efficiency 95-98%). They consume very little power, usually 2% to 5% of the maximum load. The voltage regulator reduces the frequent fluctuations of electrical components, causing unnecessary fluctuations in the power supply system. Thus effectively extending the service life of the equipment. In addition to the basic stability function, the current regulator also has many useful additional functions, such as overload protection, zero voltage switch, frequency change protection, voltage cut-off display, output start and stop function, manual/automatic-start, voltage cut-off, etc.
Automatic AC voltage stabilizer, whose structure is composed of contact self-coupling regulator, servo motor, automatic control circuit, etc. When the grid voltage is unstable or the load changes, the automatic sampling control circuit sends a signal to drive the servo motor to adjust the self-coupling adjustment The position of the carbon brush of the device adjusts the output voltage to the rated value and reaches a stable state. Three-phase high-precision automatic AC voltage stabilizer is a combination of the performance of SVC series single-phase products. Its input phase system is divided into a three-phase four-wire system. The output voltage is line voltage 380V within the rated capacity range. It is used by three-phase 380V electrical equipment and has an overvoltage protection function.
The basic job of the voltage regulator is to perform two necessary functions, namely the buck and boost functions. The step-down and step-up functions are just functions to regulate constant voltage under overvoltage and under-voltage conditions. The buck and boost functions can be performed manually with the help of a selector switch or automatically with the help of other electronic circuits.
The three-phase voltage regulator can achieve 95% or higher efficiency by optimizing the design and using high-quality CRGO laminate and 99.9% pure copper. The waveform distortion is zero. Unable to load power factor and power frequency changes. Controlled by a solid-state plug-in glass epoxy control card based on a microprocessor controller/IC. At the same time, the three-phase voltage regulator is also in line with IS-335's high-quality ultra-high-pressure motor oil.
1. High reliability and strong anti-interference ability
High reliability is the key performance of electrical control equipment. It is manufactured using strict production technology. The internal circuit adopts advanced anti-interference technology and has high reliability. It has a hardware failure self-detection function and can promptly alert when a failure occurs. information.
2. Complete supporting facilities, perfect functions, and strong applicability
It can be used in industrial control occasions of various scales. In addition to logic processing functions, it can also be used in various digital control fields. With the enhancement of communication capabilities and the development of human-machine interface technology, it has become very easy to use PLC to form various control systems.
3. Easy to learn and use, welcomed by engineers and technicians
As a general industrial control computer, the voltage stabilizer is a piece of industrial control equipment for industrial and mining enterprises. The interface is relatively easy, and the programming language is also very simple so that engineers and technicians can accept it faster and easier; the graphical symbols and expressions of the ladder diagram language are more suitable for people who are not familiar with electronic circuits, computer principles, and assembly language. Good learning and use.
4. The system design and construction workload is small, easy to maintain and easy to modify
The voltage stabilizer replaces the wiring logic with storage logic, which reduces the external wiring of the control equipment, greatly shortens the control system design and construction cycle, and at the same time, maintenance becomes easier.
5. Small size, lightweight and low energy consumption
The newly produced varieties of voltage stabilizers have a bottom size less than 100mm, a weightless than 150g, and power consumption of only a few watts.
Compared with other types of regulators, three-phase automatic voltage regulator products have the advantages of large capacity, high efficiency, no waveform distortion, stable voltage regulation, etc., and can be widely used in various industries such as industry, transportation, post and telecommunications, railways, scientific research, military, etc. In the field of large-scale electromechanical equipment, production lines, communications, medical, computer room and other places that require voltage stability, it can withstand instantaneous overload, can work continuously for a long time, manual/automatic switch at will, also has small size, lightweight, use and installation Convenient, reliable operation and other advantages. A
1. Mechanical pressure regulating type. The carbon brush is driven by the servo motor to move on the winding sliding surface of the autotransformer, and the ratio of the output voltage (Vo) to the input voltage (Vi) is changed to achieve the adjustment and stability of the output voltage of the regulated power supply. Its characteristics are simple structure, low cost, and low distortion of the output waveform. However, due to the sliding of the carbon brush, the contacts are prone to sparks, causing damage to the brush and even failure due to burnout, and the voltage adjustment speed is slow.
Second, change the tap type. The autotransformer is made into multiple fixed taps, and the relay or thyristor (solid-state relay) is used as a switch control to automatically change the position of the tap to achieve the stability of the output voltage. This type of voltage regulator has the advantages of simple circuit, wide single-phase voltage regulation range (130V-280V), high efficiency (≥95%), and low price. The disadvantage is that the voltage regulation accuracy is low (?～10%) and the working life is short. It is suitable for households to supply power to air conditioners.
3. Oil induction type. A device that stabilizes the output AC voltage by changing the phase difference of the transformer secondary voltage relative to the primary voltage. It is similar to wire-wound asynchronous motor in structure, and similar to an induction voltage regulator in principle. It has a wide range of voltage regulation, a good output voltage waveform, and a power of hundreds of kilowatts. However, because the rotor is often locked, the power consumption is large and the efficiency is low. Also, copper and iron use more materials, so less production.
4. Electronic thyristor type. By controlling the on-off of the bidirectional thyristor, the tap of the autotransformer is switched, thereby changing the size and polarity of the compensation voltage of the compensation transformer, and achieving the purpose of stabilizing the output voltage. Due to the use of auto-transformer top-level voltage regulation, it not only reduces the on-off voltage of the bidirectional thyristor (from 220V to below 200V) but also suppresses the inrush current generated during gear shifting (auto-transformer itself is a high-power Reactor), thus greatly improving the working reliability of the bidirectional thyristor.
220V single-phase voltage regulator and 380V three-phase voltage regulator, the common voltage is divided into 220V single-phase voltage and 380V three-phase voltage, and the most commonly used voltage in the industry is 380V, that is, three-phase voltage, can also be said It is 380V three-phase voltage, and when such voltage is unstable, we need a 380V three-phase voltage regulator.
For the 380V three-phase voltage regulator, the most common wiring method is a three-phase four-wire voltage regulator, which is composed of three live wires and one neutral wire.
The less-used 380V three-phase voltage regulator is a three-phase three-wire system. This type of voltage regulator only needs to be connected to three live wires. No neutral line is required. For the 380V three-phase voltage regulator, the wiring system is completely based on the user's environment and the wiring requirements of the load equipment.
1. Using chip control technology and other fast AC and current switching voltage stabilization technology to make the regulator work more efficiently and precisely
2. Make product performance more reliable, reduce maintenance costs, and effectively ensure the normal operation of equipment
3. With intelligent display, high safety, simple operation, and the data display system is very clear and accurate
4. The reaction speed is fast. When the voltage changes quickly and the fluctuation is more frequent, the non-contact voltage regulator can keep the output voltage at the required stable voltage value.
5. There will be no impact on any electrical appliances and equipment, and there will be no overvoltage or low pressure
6. Compensation operation is not required at startup, the input and output voltages are kept the same so that the electrical appliances will not be damaged because the voltage at startup is too high or too low
7. Its load capacity is very strong, even if it is used in a 100% load situation, it will not be damaged.
8. It is not easy to produce distortion, because the SCR is not on the main circuit, so it can work for a long time and the work efficiency is high, which is very energy-saving and environmentally friendly
9. Due to the three-phase split adjustment, each does not affect each other, is relatively independent and stable
10. The preset function is also very strong, which can be set for stable voltage, protection value, etc., as well as the functions of lightning protection and diagnosis of instrument faults. It is easy to maintain in the event of a fault and has good anti-interference ability.
In the actual selection, the power supply should be reasonably selected according to the rated power of the electrical equipment, power factor, and load type. And the output power should have a proper margin, especially for the selection of impact load, the margin should be larger, the specific choices are as follows:
For pure resistance loads, such as incandescent lamps, resistance wires, electric furnaces, and other equipment, the power of the voltage regulator should be 1.5-2 times the power of the load equipment.
Inductive and capacitive loads, such as fluorescent lamps, fans, motors, water pumps, air conditioners, computers, refrigerators, etc. The power of the regulator should be 3 times the power of the load equipment.
In the case of larger inductive and capacitive loads, the starting current of the load should be considered to be very large (the maximum is 5-8 times the rated current), so the power of the regulator should be greater than 3 times the load. Load power.
Our stabilizer provides a variety of voltage regulators, and its goal is to find the ideal choice for your equipment. It can ensure that gadgets and larger household appliances (such as TVs, air conditioners, and music systems) are protected from voltage spikes and surges. Similarly, we provide a series of universal stabilizers to meet the various needs of large household appliances. You can study this category carefully to find a machine that is suitable for you.