There are many places where high voltage motors can be used. The high
pressure is exactly what the name implies. It must be used with
high-voltage machines. Here is a look at high-voltage DC motors.
High voltage DC motor introduction, working principle:
High voltage motors are motors with a rated voltage above 1000V. Frequently used voltages are 6000V and 10000V. Due to different power grids abroad, there are also voltage levels of 3300V and 6600V. The high voltage motor is generated because the motor power is proportional to the product of voltage and current, so the power of the low voltage motor increases to a certain extent (eg 300KW/380V). The current is limited by the allowable bearing capacity of the conductor, which is difficult to be made large, or the cost is too high. It is necessary to achieve high power output by increasing the voltage. High-voltage motors have the advantages of high power and strong ability to withstand impact. The disadvantages are large inertia and difficulties in starting and braking. Power, coils and resistors should also be large.
Application of high voltage DC motor:
The most widely used among various motors is an AC asynchronous motor (also called an induction motor). It is easy to use, reliable in operation, low in price, and robust in structure, but it has a low power factor and it is difficult to adjust the speed. High-capacity and low-speed power machines are often used for synchronous motors (see synchronous motors). Synchronous motor not only has high power factor, but also its speed has nothing to do with the load. It is only determined by the grid frequency. The work is more stable. In the case of requiring a wide range of speed control, DC motors are often used. But it has commutators, it has a complicated structure, it is expensive, it is difficult to maintain and it is not suitable for harsh environments.
High voltage motor
After the 1970s, with the development of power electronics technology, the speed regulation technology of AC motors has gradually matured, and the price of equipment has been declining. It has begun to be applied. The maximum output mechanical power that the motor can assume under the specified working conditions (continuous, short-term operation, intermittent cycle operation) without causing overheating of the motor is called its rated power, and should be noted on the nameplate when used. . When the motor is running, care must be taken to match the characteristics of the load with the characteristics of the motor so as to avoid speeding or stalling. Electric motors can provide a wide range of power from milliwatts to tens of kilowatts.
The use and control of the motor is very convenient, with self-starting, acceleration, braking, reversing, grabbing and other capabilities, can meet a variety of operational requirements; motor work efficiency is high, there is no smoke, odor, no environmental pollution, noise Also smaller. Because of its series of advantages, it is widely used in various aspects such as industrial and agricultural production, transportation, national defense, commerce and household appliances, and medical electrical equipment. The output power of a general motor will change with the speed when the motor speeds.
High-voltage DC motor protection device:
Motor differential protection devices are mainly used in large-scale high-voltage motor power plants, chemical plants and other places. If a serious fault causes the motor to burn down, it will seriously affect the normal production and cause huge economic losses, so it must provide perfect protection. The existing motor integrated protection device is mainly used for small and medium-sized motors, and provides protection functions such as current breaking, thermal overload inverse time overcurrent, two-stage timing negative sequence, zero-sequence current, rotor stall, long startup time, and frequent startup. . For a large-capacity motor with a capacity of more than 2000KW, it cannot meet the requirements for protection sensitivity and rapidity during internal faults. Therefore, this device is developed and integrated with a comprehensive protection device to provide more reliable and more sensitive protection measures for high-voltage motors. The device is designed for three-phase longitudinal differential, because the 3KV, 6KV, and 10KV power grids with over 2000KW motor capacity may be the high-resistance grounding power grid of the transformer neutral point. The three-phase differential protection can not only be used as a motor stator winding. The primary protection of the lead-out phase-to-phase short-circuit and the main protection of the single-phase earth fault can act on the instantaneous trip.
High voltage DC motor introduction, working principle:
High voltage motors are motors with a rated voltage above 1000V. Frequently used voltages are 6000V and 10000V. Due to different power grids abroad, there are also voltage levels of 3300V and 6600V. The high voltage motor is generated because the motor power is proportional to the product of voltage and current, so the power of the low voltage motor increases to a certain extent (eg 300KW/380V). The current is limited by the allowable bearing capacity of the conductor, which is difficult to be made large, or the cost is too high. It is necessary to achieve high power output by increasing the voltage. High-voltage motors have the advantages of high power and strong ability to withstand impact. The disadvantages are large inertia and difficulties in starting and braking. Power, coils and resistors should also be large.
Application of high voltage DC motor:
The most widely used among various motors is an AC asynchronous motor (also called an induction motor). It is easy to use, reliable in operation, low in price, and robust in structure, but it has a low power factor and it is difficult to adjust the speed. High-capacity and low-speed power machines are often used for synchronous motors (see synchronous motors). Synchronous motor not only has high power factor, but also its speed has nothing to do with the load. It is only determined by the grid frequency. The work is more stable. In the case of requiring a wide range of speed control, DC motors are often used. But it has commutators, it has a complicated structure, it is expensive, it is difficult to maintain and it is not suitable for harsh environments.
High voltage motor
After the 1970s, with the development of power electronics technology, the speed regulation technology of AC motors has gradually matured, and the price of equipment has been declining. It has begun to be applied. The maximum output mechanical power that the motor can assume under the specified working conditions (continuous, short-term operation, intermittent cycle operation) without causing overheating of the motor is called its rated power, and should be noted on the nameplate when used. . When the motor is running, care must be taken to match the characteristics of the load with the characteristics of the motor so as to avoid speeding or stalling. Electric motors can provide a wide range of power from milliwatts to tens of kilowatts.
The use and control of the motor is very convenient, with self-starting, acceleration, braking, reversing, grabbing and other capabilities, can meet a variety of operational requirements; motor work efficiency is high, there is no smoke, odor, no environmental pollution, noise Also smaller. Because of its series of advantages, it is widely used in various aspects such as industrial and agricultural production, transportation, national defense, commerce and household appliances, and medical electrical equipment. The output power of a general motor will change with the speed when the motor speeds.
High-voltage DC motor protection device:
Motor differential protection devices are mainly used in large-scale high-voltage motor power plants, chemical plants and other places. If a serious fault causes the motor to burn down, it will seriously affect the normal production and cause huge economic losses, so it must provide perfect protection. The existing motor integrated protection device is mainly used for small and medium-sized motors, and provides protection functions such as current breaking, thermal overload inverse time overcurrent, two-stage timing negative sequence, zero-sequence current, rotor stall, long startup time, and frequent startup. . For a large-capacity motor with a capacity of more than 2000KW, it cannot meet the requirements for protection sensitivity and rapidity during internal faults. Therefore, this device is developed and integrated with a comprehensive protection device to provide more reliable and more sensitive protection measures for high-voltage motors. The device is designed for three-phase longitudinal differential, because the 3KV, 6KV, and 10KV power grids with over 2000KW motor capacity may be the high-resistance grounding power grid of the transformer neutral point. The three-phase differential protection can not only be used as a motor stator winding. The primary protection of the lead-out phase-to-phase short-circuit and the main protection of the single-phase earth fault can act on the instantaneous trip.