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Anonymous users2024-02-11The motor protector can fully control the motor, if the motor is not mindful, that is, overcurrent, stalled, phase broken, overheating, bearing wear, overvoltage or undervoltage and other situations, the protector will alarm and control in a timely manner, to give the motor timely protection. Its application scope is mainly concentrated in the field of power distribution, such as coal mining, petrochemical, electric power, etc.
The motor protector has certain requirements for the working environment, the humidity in the air must be below 90%, and the temperature is controlled between minus 30 degrees Celsius and 70 degrees Celsius. In different places, there will be different names for motor protectors, in addition to motor protectors, it is also called motor protectors and motor protectors.
From the advent of motor protectors to today, a total of three types have appeared, the earliest being thermal relays in the early fifties. This motor protector was developed by the Soviet Union and belongs to the metal sheet mechanical protector. This kind of machine has a relatively simple structure and has a time-limited function.
However, there are not many functions, and occasionally there are problems of stalled rotor and poor ventilation, so that the protection of the motor is lost. The thermal relay itself is not very repeatable, and if there is a short circuit, it can no longer be used. And in the process of use, it is very susceptible to the influence of the surrounding environment, and the energy consumption is also very serious.
After the thermal relay, there is a second kind of motor protector, this Bao Jingqing protector has made great progress in the original basically, it is made of bimetallic sheets, the whole structure is relatively simple, and the scope of protection is much wider than the original, but it is inevitable that the machine is too slow to move during the operation, and the time used to return is not short. It is now mainly used in household appliances such as electric fans and refrigerators.
The third type of motor protector is electronic, and this motor protector itself has undergone a long process of development, the first machine used transistors, and later developed into integrated circuits, and today has begun to use microprocessor chips. And its protection for the motor is divided into types, including comprehensive protection, temperature protection and so on. This motor protector has a lot of functions, including energy saving, flexible action, sound function, low energy consumption, strong repeatability, etc., almost to overcome all the shortcomings of the previous ones, to meet the basic needs of modern people for motor protectors.
Of course, this kind of machine is not the best, with the progress of science and technology, I believe that there will be better motor protectors will be invented.
You can get it for free
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Anonymous users2024-02-10The motor integrated protector adopts advanced microcomputer technology and high-performance integrated chip, which has powerful functions and excellent performance. The test accuracy is high, the linearity is good, the resolution is high, the whole machine has strong anti-interference ability, and the protection action is reliable. Three-phase current value, voltage value and various fault codes are displayed on the LED and LCD, which is intuitive and clear.
Good stability, long-term work without maintenance.
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Anonymous users2024-02-09Contact capacity: AC220V 5A, AC380V 3A, electrical life is more than 1000000 times.
Contact characteristics Contact J1 is normally closed, contact J2 is normally open, if it needs to be specially formulated for production.
Working voltage: AC220V, AC380V 15[%]50Hz 2[%], other specifications are customized.
Allowable error of 5[%].
Split display distance less than 5 meters standard meter.
Dimensions: 143mm, 66mm, 157mm, split cutout: 121mm, 51mm
Current measurement range 1-400A
Power consumption is less than 3 W
Current output 4-20mA
The start latching delay is 10 seconds to 20 seconds, and the reverse time limit is reversed.
Overcurrent trip time Inverse time limit (4-60 seconds).
The out-of-phase tripping time is less than 2 seconds.
Overvoltage trip time less than 2 seconds (greater than 15 [%] working voltage) leakage trip time less than seconds (leakage voltage greater than 50V) manual reset time 2 seconds.
The function of the motor protector is to give the motor a comprehensive protection control, in the motor overcurrent, undercurrent, phase failure, stalled, short circuit, overvoltage, undervoltage, leakage, three-phase unbalance, overheating, grounding, bearing wear, stator and rotor eccentricity, winding aging to alarm or protection control. >>>More
In some cases, frequent motor starts are required. For example, the lifting machinery working at the installation site of large equipment often requires the lifting machinery to slightly rise, descend or move back and forth, left and right to move the large equipment parts that are lifting, and the operation is often carried out in the way of "joging". This allows the components of the equipment to be precisely positioned and installed. >>>More
380V three-phase asynchronous motor power 1KW power corresponds to 2A current, so the normal current of your motor should be 11A, 16A current corresponding power is 8KW, you can directly switch to the same speed) of the motor, the role of frequency conversion is mainly to solve the problem of soft start of the motor and lower the speed, and the power will be reduced while the speed is lowered, and it is impossible to solve the problem of small horse-drawn carts. >>>More
The current of the 55kw motor is between 110A, (calculated according to the empirical algorithm of two currents per kilowatt), choose CJ20-150 contactor, and choose according to the current of the load.
Fuse. It is mainly used for short-circuit protection, thermal relay. >>>More