The biggest use of the three-phase voltage regulator is to stabilize the voltage that is quite large and does not meet the requirements of the appliance within a set range so that the appliance can work at a normal voltage. The three-phase transformer is a combination of three single-phase transformers with the same capacity. It has three iron core columns, each of which is surrounded by two coils of the same phase, one is a high voltage coil and the other is a low voltage coil. Three-phase transformers are generators that produce equal amplitude, equal frequency, and 120?phase difference. The three-phase generator is used as the power source, and the three-phase generator is called the three-phase power source.
When choosing a three-phase voltage regulator, the first consideration is to consider the power of the three-phase voltage regulator, that is, the capacity of the three-phase voltage regulator. The so-called capacity is the total power of the load that the three-phase voltage regulator needs to connect.
Confirm the total power of your regulated electronic equipment. Power is also an important factor in choosing a regulator. If the capacity of the regulator is less than the total power of the powered device, the regulator will automatically disconnect the protection circuit or Xuanyuan Road. Of course, if the power of the regulator is much greater than the total power of the device, it is also a waste of money for the user. The heat generated by the full load will increase the loss of components. If the operation is overloaded, the required current is too large, and the voltage is bound to be pulled down. The maximum power that must be loaded when taking the total power of the load, the total power is the number of connected loads plus the maximum power of the load.
Since the regulator has a voltage adjustment range, if the range of the regulator is insufficient, the regulator will open when the voltage exceeds the factory default setting of the regulator. Of course, if the range of the regulator is too large, the price of the regulator will be very high, thus causing unnecessary waste of money to the user.
When purchasing a three phase voltage stabilizer, the voltage fluctuation value of the local area should also be considered:
The voltage fluctuation value is also one of the factors that must be considered in the selection of three-phase voltage regulators, because if the voltage fluctuation value is selected too small, and the fluctuation exceeds the voltage stabilizer's voltage regulation range. When it exceeds the value, it will directly affect the three-phase stability. The voltage stabilizing work of the voltage regulator and the normal work of the load equipment, so when we choose the voltage stabilizing range, the maximum fluctuation range value is taken.
Automatic thyristor function and accuracy. It is possible to choose the automatic thyristor function as freely as possible when purchasing the regulator, although the price may be slightly higher. But it’s more cost-effective than the economic loss that comes from burning your machine. Old voltage regulators use the principle of relay switching when the voltage changes. At the moment of switching, the current will have a slight floating shock. Therefore, the greater the accuracy, the smaller the current impact.
The last thing you need to determine is the power and range of the regulator. At the same time, you can also consider the type of regulator you want to buy here. Here I recommend SCIENTEK ELECTRICAL to everyone, it is a professional R&D inverter, The manufacturers of voltage regulators have made great achievements in automatic voltage regulators and solar energy. If necessary, you can buy them at Scientek Electrical Co., Limited.
Transformers do not have a voltage stabilizing effect, but using negative feedback skills requires planning a transformer with a voltage stabilizing effect. This is no doubt, but generally speaking, transformers are not like this. The output voltage change of the transformer in a certain application range is not large, and what we call voltage regulation is not a concept.
The voltage regulator has applied the same skills to stabilize the output voltage. The output voltage is sampled through a voltage divider connected to the inverting input of the error circuit, and the non-inverting input of the error circuit is connected to a reference voltage.
The error circuit is always trying to force its inputs to be flat. To this end, it supplies the load current to ensure that the output voltage is stable (that is, negative feedback).
Taking high voltage winding as an example, the star connection is to connect the tail ends of the three-phase winding together to make a neutral point and find the first end of the three-phase winding separately. When drawing the wiring method, the three-phase winding should be vertically parallel It is drawn that the phase sequence is from left to right, the positive azimuth of the potential difference is shifted from the tail end to the head end, and the working voltage azimuth is reversed. When drawing a phasor diagram, the phase B potential difference should be drawn vertically. The other two phases are ordered 120? apart in a clockwise direction. The azimuth of the three-phase potential difference is shifted from the tail to the head, and the line potential difference is from the tail. The end is biased towards the head.
Delta’s connection is to combine the first and tail ends of the three-phase winding into a closed control loop and find three contacts. The delta connection also has two connection methods: sequential connection and reverse connection. When drawing the wiring method, the three-phase windings should be arranged in vertical parallel planes, the phase sequence is from left to right, and the first end of the previous phase winding is connected to the tail end of the next phase winding.
The reverse connection is to connect the tail end of the previous phase winding with the head end of the next phase winding. When drawing a phasor diagram, still draw phase B vertically upwards, the three connected points are sorted in a clockwise direction to form a closed equilateral triangle, the triangle is biased to the right when connected forward, and the triangle is biased to the left when reverse connected The potential difference and working voltage orientation of each phase are the same as the star wiring.
In other words, the phasor diagram is drawn according to the connection status of the three-phase winding, which is this kind of configuration diagram. The equipotential points overlap on the graph as a single point, and the directed line segment between the arbitrary two points expresses the phasor of the potential difference between the three points on both sides, and the azimuth is deviated from the tail end to the head end.
When connecting three-phase windings, be sure to strictly follow the winding edge marking and wiring method. Do not exchange the first and tail ends of the one-phase winding, otherwise, it will cause different three-phase voltages, unbalanced three-phase currents, and even destroy the transformer.
Receive the voltage regulator input on the power distribution board, and install a fuse that meets the power guarantee rate of the instrument on the user power distribution board to ensure the safety of electricity use.
Receive the power supply of the electronic equipment to the output terminal of the instrument. Note that the rated input voltage of the electrical appliance should be consistent with the output of the voltage regulator. Do not connect it wrong.
First, turn on the power switch of the voltage regulator, the work indicator light is on. Observe whether the command value of the voltmeter is normal. When the output voltage is normal, then turn on the power switch of the electronic equipment, the voltage regulator can automatically change the voltage, normal power supply.
When power electronic equipment is unnecessary for many years, please turn off the power switch of the power electronic equipment to reduce power consumption and prolong the service life of the regulator.
The voltage regulator must not be overloaded. When the mains voltage is higher, the output capacity decreases, and the load on the regulator should be reduced accordingly.
When selected as electronic equipment with refrigerators, air conditioners, water pumps and other motors running on electrical appliances, a voltage stabilizer with a capacity of more than 3 times should be freely selected to avoid restarting the electronic equipment as much as the current of the regulator fuse or overcurrent protection. The current of the regulator makes the voltage regulator fuse blown or the circuit breaker trips or the voltage drop too much to work.
The wire connected to the voltage regulator should have sufficient load surface to avoid heating and reduce the voltage drop. Voltage stabilizers with a capacity of 2KVA or more are connected by terminals. Single copper wire should be used, and the terminal screws should be tightened as much as possible to avoid heating at the connection.
Whether it is a single-phase or three-phase regulator, after connecting all input and output lines, the power switch of the load should be turned off first, and then the regulator should be turned on. After the output voltage is verified to be normal, the power switch of the load should be turned on again.
Three-phase transformers are widely used in electrical products supporting important equipment, precision machine tools, mechanical and electronic equipment, medical equipment, rectifiers, lighting, etc. The input and output voltage levels, the selection of the connection group, the number and position of the adjustment taps (generally ?%), the distribution of winding capacity, the output single-phase winding equipment, the use of rectifier circuit, whether it is required to have a housing, Etc., can be customized according to user requirements.
The wide input voltage range of the voltage regulator allows it to make a wide range of changes in the battery voltage of the car. At the same time, the switching power supply of the voltage regulator and its supercapacitor perform a perfect fusion of the system, which can make the work smooth and intelligent. To a certain extent, it can effectively protect the car's battery. There is also its low ripple output, which can effectively control the interference of power supply noise. The voltage regulator also has a comprehensive protection function, which can automatically restore the input voltage and can perform restrictive protection for the input current.
The precautions for the use of the voltage regulator are: do not use excessively high loads; please use enough wires; please carefully connect the input voltage and the output of the equipment; the output voltage of the equipment and the voltage regulator should be unified; please choose the input The voltage switch is the same as the power supply voltage; if the fuse is burnt out, please check the load equipment; use the same rated fuse, not use non-rated fuses or wires; install in a dry and ventilated place. Let me explain in detail below
1. When power electronic equipment is unnecessary for many years, please turn off the power switch of the power electronic equipment to reduce power consumption and prolong the service life of the regulator.
2. The wire connected to the voltage regulator should have sufficient load surface to avoid heat generation and reduce voltage drop. Voltage stabilizers with a capacity of 2KVA or more are connected by terminals. Single copper wire should be used, and the terminal screws should be tightened as much as possible to avoid heating at the connection.
3. The voltage regulator shall not be overloaded(40KW three-phase voltage stabilizer). When the mains voltage is higher, the output capacity decreases, and the load on the regulator should be reduced accordingly.
4. Regardless of the single-phase or three-phase voltage regulator, after connecting all input and output lines, the power switch of the load should be turned off first, and then the regulator should be turned on. After the output voltage is verified to be normal, the power switch of the load should be turned on again.
5. When selected as electronic equipment with electrical appliances such as refrigerators, air conditioners, water pumps, and other motors, voltage regulators with a capacity of more than 3 times should be freely selected to avoid restarting current of electronic equipment as much as the current of the regulator fuse or overcurrent. Protecting the circuit breaker current causes the voltage regulator fuse to blow or the circuit breaker to trip or the voltage drop is too large to work.