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1) According to the installation method, there are vertical and column type. The motor stroke arrangement is very large, and the vertical type is usually used for starting a motor with a large volume, while the column type is used for a motor with a small volume. (2) The motor drive system methods according to the theme are push rod type, rack and pinion type, screw type, etc. From the actual effect of the application, the screw drive system depends on some. (3) Water cooling method is natural water cooling
(1) There are vertical and column type according to the installation method. The motor stroke arrangement is very large, and the vertical type is usually used for starting a motor with a large volume, while the column type is used for a motor with a small volume.
(2) The motor drive system methods according to the theme are push rod type, rack and pinion type, screw type, etc. From the actual effect of the application, the screw drive system depends on some.
(3) According to the water cooling method, it is a natural water-cooling type. This type of equipment is not equipped with a liquid circulating water pump and a refrigeration system. At present, there are many production and manufacturing operations in China. There are also methods for mixing and cooling systems with liquid circulation systems, and such imported machinery and equipment are used more. The start-up circulating water pump can also be activated in winter to avoid the actual effect of refrigeration.
(4) According to the electric level, it can be divided into grid type, flat type, umbrella type, spiral, etc., but no matter which method, it must be checked frequently, and the total area of the reasonable energization flow is reduced and burned.
1. Several types of general blood pressure lowering start-up methods for cage motors include: stator string resistor or string reactance for blood pressure lowering start, auto-coupling compensation start, star-triangle start, extended-edge tri-trim start, AC motor speed start.
2. The starting mode of the three-phase electric winding asynchronous motor is as follows: the rotor string resistor and the motor rotor are connected with the double frequency sensitive varistor. Several types of starting methods are widely used in bottom-pressure motors. Before the start of the high-voltage motor, the method of starting the blood pressure lowering of the series reactor in the stator control loop of the motor is widely used. At present, the application of environmental protection and energy conservation has been gradually reduced.
1. Vacuum circuit breaker function: manipulating and maintaining the piezoelectric device
2, the role of voltage transformer: the high working voltage is converted into a standard operating voltage of 100V or lower in proportion to the maintenance, measurement verification, instrument panel equipment application.
3. The role of voltage transformer: convert the current value of a large value to a re-current amount (5A, 1A) with a small value according to the necessary ratio, for main purposes such as maintenance, accurate measurement, and metrological verification. .
4. Grounding device Knife switch function: As a device for ensuring life safety during maintenance, the mechanical device used for grounding device.
5, the function of the isolating switch: to isolate the power supply, the rolling maintenance machine equipment and the induction motor equipment are broken, so that there is a significant visible break point during the period.
6, zinc oxide arrester role: used to maintain a variety of electrical equipment in the power supply system from lightning overvoltage, actual operating overvoltage, DC transient overvoltage impact and destruction of such electrical equipment.
7, the function of the live display: immediately installed in the electrical equipment in the room, visual display information, whether the electrical equipment is equipped with an operating safety voltage warning device
8. Comprehensive insurance function: It shows maintenance for different control loops such as route, capacitor and motor. It is a large digital microcomputer protection device integrating precision measurement, operation, maintenance and communication.
9. Power Engineering Automotive Relay Function: Connect or disconnect the power supply circuit according to the change of physical quantity such as working voltage and current quantity, and maintain and operate.
10, liquid resistance starter cabinet comprehensive measurement and control equipment role: a control loop simulation simulation diagram and power switch status indication, pressure sensing power display information, automatic temperature and humidity control, electrical main parameters accurate measurement and communication socket, set actual Operation and display of information in integration.
11. Function of temperature and humidity controller: It is used to adjust the internal temperature and environmental humidity of machinery and equipment such as medium pressure liquid pressure start-up cabinet to avoid mechanical failure caused by ultra-low temperature and high temperature, and creepage and flash caused by returning moisture or condensed water. The occurrence of network security incidents.
12. The role of comprehensive measuring instruments: comprehensively test the main parameters of power engineering such as current quantity, working voltage and output power of power grid, statistical analysis of electromagnetic energy, and track and analyze the power quality of power grid.
13. Function of voltage transformer overvoltage protection device: The key is to maintain the re-side winding resistance of the rolling voltage transformer, avoiding the high side working voltage and destroying the re-components.
1.1 water resistor resistance is very small
In all normal applications, the raw water resistor resistance is getting smaller and smaller, and the starting current is too large. The reason is that the summer working temperature is high or the temperature of the water resistor is often increased after starting, causing the water to volatilize, and the concentration of the substance is increased to reduce the electric resistance. Usually, the water is discharged to the standard water level line and everything can be started normally.
1.2 overload is too large
The grinding of the piston pin before and after the mill is not very good, which causes the starting load to be too large, especially in the winter. The working temperature is low. Although the grease has been warmed, the temperature of the pump oil after the grinding is still low. Required 35 ° C. On the other hand, the grinding of the grinding body is uneven, which will also increase the starting load. Therefore, before starting the machine equipment, it is necessary to open the humidification equipment and assist the transmission system to grind, so that it can ensure excellent lubrication and distribute the grinding body. In the specific work, several times of starting a moment, that is, the power jump is caused by excessive load. First, the auxiliary drive system is used to turn the two-turn grinding, and the start can start normally.
1.3 slip ring short circuit fault
The motor slip ring chamber is in-line sealed, and the carbon powder is easy to stay in the room and adhere to the inner side of the slip ring (the thickness is 2 mm in January). Therefore, when the resistance of the water resistor is small, the load is too large, or the load condition is usually generated, the adhesion of the carbon powder to the inner side of the slip ring may cause the short-circuit failure of the shaft to "fire" and even calcine the surface of the slip ring. In order to prevent this from happening, only the carbon powder is removed on time.
1.4 Starting resistors are not balanced
The insulation tube or the insulating tube mechanical equipment of the water resistor is damaged, resulting in damage of the insulating layer material, or the insulating layer material is thick and soft, and the starting current amount will cause thermal breakdown, thereby causing the three-phase electric resistor to be unbalanced and the starting difference is poor. Dynamic protection posture jumps. The resolution method can be checked immediately by the European method in the instruction manual or by hanging the upper casing, but it is time consuming and laborious.
2 start the whole process of jumping
During the whole process of starting the motor, the galvanometer displays information about 250A, and the sound of the hearing machine feels that the speed ratio is faster than all normal, and jumps up and down for 30s, and the overcurrent maintenance posture. In this case, the first consideration should be that the resistance of the water resistor is too small; if the liquid level gauge is all normal, it can be assessed that the load is slightly larger, and the load is too large to solve. The most easily encountered faults in the common faults of motor start-up and jump-over during over-current flashover are usually easy to solve.
3 When the whole process is started, the water resistor is removed when the water resistor is removed.
After the motor runs for 50s, the water resistor is removed, and the vacuum contactor is short-circuited immediately after the posture of the vacuum contactor. There are two common faults:
3.1 water resistor resistance is slightly larger
Because the water solution leaks and volatilizes, the liquid level meter is lowered and then moisturized, or Na2CO3 is reduced due to the exothermic reaction, which causes the water resistor to have a slightly larger resistance. During start-up operation, the galvanometer is stable at about 210A, and the grinder accelerates the sound. The motor speed ratio within 50s is less than 90% (about 75s). Therefore, when the vacuum contactor is closed, the load suddenly increases. The electric current has a very large step (more than 300A), causing the electric water flow to break the maintenance posture and jump. Therefore, adding Na2CO3 to the aqueous solution to reduce the water resistor resistance is the only solution. The basic theory should extract the aqueous solution and test the concentration value to measure the quality of the addition of Na2CO3. In particular, it can be quantitatively analyzed according to the observation status on the spot, and the actual effect can be observed.
3.2 Electrical grade surface layer adhesion waste causes the starting resistor to be slightly larger
The water resistor has been applied for a period of time. The adhesion of the surface of the electric grade layer causes the starting resistor to be slightly larger. The common fault condition is basically the same as the resistance of the water resistor is slightly larger, which is not very easy to distinguish. The usual work experience is that if the liquid resistance starter cabinet is used for about 5 years to generate this common fault condition, the power level waste should be considered. The method of cleaning the electrical grade waste can be cleaned with a strong alkali with a concentration of 30% according to the instructions.
3.3 Short-circuit vacuum contactor three-phase electricity is different 歩
The short-circuit vacuum contactor is just closed and differential protection is the posture jump, but the galvanometer display information only expands a little, which indicates that the vacuum contactor has different three-phase power. When adjusting the three-phase power of the vacuum contactor, it is possible to connect two bulbs per phase, and the contact points are slowly closed according to the mechanical equipment levers, and the plugging of the bulbs is observed to adjust, but the contact points must be ensured during the adjustment. Do not lower the required minimum clearance to prevent thermal breakdown from starting. This common failure is very rare, and machine applications have only been produced so far.
Magnetic soft start: The switching power supply of the motor stator cover of the synchronous motor, after the blood pressure is lowered or the rated power of the motor is started, the asynchronous operation is entered, and the excitation regulator winding is autonomously demagnetized according to the demagnetization phase. During this time, the power is turned on. The circuit single pulse is blocked and the rectifier bridge is not working. When the speed ratio is increased to the required value, according to the full pressure stage, the motor motor rated power is started. When the motor speed ratio exceeds the sub-idle speed, the power circuit is turned on, and the output single pulse is sent to the crystal.