A three-phase voltage stabilizer is used for transportation, post and telecommunications, communications, radio and television, computer systems, injection molding, CNC machine tools, and various electric motors, etc., and for imported CT machine and other medical equipment, all kinds of elevator supporting special models.It can be divided into 10 kw 3 - phase voltage stabilizer, Three-phase voltage stabilizer, Three-phase voltage regulator,20KW three-phase voltage regulator,20KW three-phase voltage stabilizer,40KW three-phase voltage regulator...
Three-phase voltage regulator’s function and working principle
A three-phase voltage stabilizer is designed to stabilize the ac voltage, and can automatically maintain the stability of the output voltage when the external supply network voltage fluctuations or load changes cause voltage fluctuations. This series product compared with other types of the voltage regulator, has a large capacity, high efficiency, no waveform distortion, stable voltage regulation, etc, and applied load, can withstand the instantaneous overload, long-term continuous work, manual/automatic switch, over-voltage protection, lack of phase, phase sequence protection and mechanical fault automatic protection, as well as small volume, lightweight, use of convenient installation, reliable operation, etc.
1. Functions of three phase voltage stabilizer:
Three-phase voltage stabilizer is a kind of power supply circuit or power supply equipment which can automatically adjust the output voltage. Its function is to stabilize the power supply voltage which fluctuates greatly and cannot meet the requirements of electrical equipment within its set value range, so that all kinds of circuits or electrical equipment can work normally under the rated working voltage.
The original power regulators stabilized the voltage by the pulsation of the relay. When the grid voltage fluctuates, the automatic correction circuit of the power regulator is activated, causing the internal relay to operate. Forcing the output voltage to remain near the set value, this circuit has the advantage of simple circuit, the disadvantage of low voltage stabilization accuracy and every - second relay jump shift, the power supply will occur - second instantaneous interruption and spark interference. This to the computer equipment reading and writing work interference is very big, easy to cause the computer error signal, serious will also make the hard disk damage. High quality small voltage regulator, most of the use of motor drag carbon brush method to stabilize the voltage, the voltage regulator on the electrical equipment generated little interference is relatively high voltage stabilization accuracy.
Due to coil components in some electrical appliances, the current will be blocked in the initial electrification of the eddy current, the generation of the eddy current will not only weaken the electrical start of the instantaneous voltage, resulting in slow start, and will strengthen the instantaneous voltage generated after the circuit break, may cause spark damage to the circuit. A voltage stabilizer is needed to protect the normal operation of the circuit.
The voltage regulator is composed of voltage regulating circuit, control circuit and servo motor, etc. When the input voltage or load changes, the control circuit will sample, compare and amplify, and then drive the servo motor to rotate, so as to change the position of the carbon brush of the regulator, and automatically adjust the coil turn ratio, so as to maintain the stability of the output voltage. The voltage regulator with larger capacity also works on the principle of voltage compensation.
1. The output power of the voltage stabilizer is the maximum power. The nominal power of household appliances refers to the active power, while the inductive load such as refrigerator, air conditioner and water pump has a large instantaneous time current at startup. Therefore, the power of refrigerator, air conditioner and water pump is x (3-5 times).
2. For example: 3-piece air conditioner (220V)
1 piece = 0.75 kw x3 piece = 2.25 kw x3 times load starting current =6.75 kw or above voltage stabilizer is applicable.
In a professional water and electricity installation, engineers and technicians and factory professional electrician stabilizer using power algorithm: - a industrial equipment according to the rated power multiplied by 2 times more power, at least when using the starter motor equipment operation, large current and impact load on the device, should choose more than 3 times the capacity of voltage regulator, in order to avoid starting current is too large, power supply circuit step-down to work properly.
Relay type Automatic Voltage Regulator AVR-F
For example, in the steam pump (380V electrical equipment) of a -i plant, the power of a motor is 7.5kw. However, when it starts to operate, the inrush current exceeds the power of the motor by more than 3 times. Therefore, a voltage regulator greater than 3 times its power must be selected. When the output voltage of 0.5kva -- 3KVA regulator is 110V, the input capacity shall not exceed 40% of the rated capacity. When the output terminal needs to be used at the same time of 110V and 220V, the output capacity shall be 50% of the rated capacity to avoid overload.
It is recommended that you buy at least three times the actual power of the regulator, because the regulator in the actual work to overcome the surge impact of the power and the inductive load of the starting shock (such as refrigerator, air conditioning, motor and electric motor).
1, the voltage regulator used in inductive load, due to the perceptual load have bigger instantaneous starting current, a sort of about 3 a 5 times the rated current is often more than 9 times the running current (such as refrigerator, air-conditioner, washing machines, electric fans, large air conditioning, printing machine, air compressor, elevators, water pumps and other all belong to the perceptual load), so that with motor, compressor electrical appliances, such as voltage regulator of inductive load, must consider its power reserve, to leave allowance, be about to reserve enough allowance, to avoid the impact of load on current stabilizer instant damage.
Voltage regulator is a device that provides stable output voltage according to the requirements of electrical equipment. It mainly includes intelligent numerical control type, auto-adjusting type, high-power compensation type, switching type and so on.
Daily maintenance of voltage regulator should pay attention to 4 points:
1. The voltage stabilizer should be placed in a ventilated, dry room with no direct sunlight and no corrosive gas;
2. The power of the stabilizer should be greater than the total power of the electric equipment;
3, the voltage regulator switch is not directly used as the main switch of the equipment, should first open the voltage regulator switch, after the power output, and then connect to different electrical equipment from small power to large power, shutdown
Shut down from big to small, and finally close the switch of voltage regulator;
4. The switch of the voltage regulator is not opened directly and frequently. The time interval of each opening should be more than 10 seconds.
Three phase voltage stabilizer can be widely used in industry, agriculture, transportation, post and telecommunications, military, railway, scientific culture in the areas of large mechanical and electrical equipment, metal processing equipment, production lines, construction equipment, elevators, medical equipment, computer rooms, computer control equipment, embroidery, textile equipment, air conditioning, radio and television, hotel and household appliances lighting need to be regulated.