5fae=BookanOldStyle00810 high-voltage cabinet in the improvement of air compressor control protection circuit Xu Shanhui Zhongqiao five company, Jiangsu Xuzhou 206 disease introduction 7 1 high-pressure cabinet control dry 5 heart 40 eight air compressor, in the power supply is not available A method of improving the cleverness of the craftsmanship site. Key clever pressure from pressure loss protection: low voltage buckle lost skin protection; lost in the cleverness and protection of the number 1 document identification code 8 due to the relative backwardness of the national coal capital construction unit technical equipment and insufficient capital investment, many well construction units still In the use of electromechanical control equipment in the 1980s and 1980s, the construction was mostly in remote areas. During the construction of the wells, the agricultural power supply was mostly used, and the reliability of the power supply was poor. "The former part of the electromechanical control equipment has been under the existing conditions of use. The device cannot be operated safely. For example, the GGSlD type acre pressure cabinet controls a 250kW synchronous motor, and the excitation cabinet is KGLF200/90. During the use of the Daning project department, the low and low storage power sources are respectively quoted from the high and low power distribution rooms of the party, and there are often high and low power outages. And power outages at different times. The electronic control of this type of high voltage cabinet can not fully guarantee the safe operation of the air compressor. The following analysis is carried out. 1 The problem of the original electronic control schematic diagram is a schematic diagram of the GCSlD high-voltage cabinet Wuxi 5レ40/8 air compressor electrical control. The GGSlD type high voltage cabinet is used in places with poor power supply reliability and has the following safety hazards. 1.1 No high pressure loss pressure, the air compressor must be emptied and the light load will be started before the air compressor is started. However, in the actual work, the agricultural power will suddenly turn off and re-energize within a few seconds to several minutes. If there is no jump in the oil circuit breaker during this time, when the power supply is restored, the empty skin machine will start by itself, which may cause non-synchronous impact, which seriously endangers the safety of the equipment. Under extremely unfavorable conditions, it may cause the large shaft of the air compressor. Twisted. In addition, if the high-voltage side is lost, if the oil breaker is not smart, and the low voltage is not de-energized, the smart shuttle current through the rotor excitation winding will continue to pass. If not found in time, it is possible to burn the excitation winding. . 1.2 Inadvertent pressure loss protection When the air compressor is running, if the two lose pressure, the high voltage cabinet should jump. Otherwise, it will cause the motor to lose its runaway. If it is not found in a short time and stopped in time, it may burn the rotor winding of the synchronous motor, especially the overheating, deformation, welding and even burning of the starting winding. In Fig. 1, in theory, the skin is lost on the skin side, and the 00 normally closed contact is connected to the circuit breaker circuit of the acre pressure cabinet. However, in the actual installation, the DC power source is similar to the low voltage cabinet and is taken from the same AC power source. The DC power supply also has no electricity, the flea circuit is connected but no current is passed, and the leather cabinet can't be peach, that is, the motor will be in the state of demagnetization and out of step. 5 run on the 40-type air-conditioner. 1.3 Excitation cabinet without loss of magnetic protection In the case of demagnetization loss of the empty skin machine, the theoretical stator current is 1.01.2JNUN. The synchronous current of the synchronous motor can not effectively cause the relay protection action of the high voltage cabinet. If the high voltage cabinet does not jump, Long-term operation may burn the motor. 2Improved electronic control schematic analysis 2.1 Install DJ132 [100~2 day 0V type voltage relay when the voltage on the off-voltage side drops to 70, the voltage relay normally closed contact is connected to the mu Yue cabinet jump circuit, Qiao The acre pressure cabinet jumps, that is, the high voltage side loses protection. 2.2 Install 1ZJ DC intermediate intelligent electric appliance [DZ51 type in DC control loop, resistance Rl2k or so, DC diode Dl and electrolytic capacitor l, 2450V, 470μF, wherein the resistance Kl can be replaced by XD5 signal lamp after the resistance 2.2k. After the power supply is energized, the lZJ line is intrinsically charged. The DC power supply passes through 17]1, and the Q1,1 is given to [1 charge. After the low voltage power supply has no power: 1, 2 through 12] 2 normally closed contacts are connected to the coil. The circuit makes the height of the cabinet jump, that is, the low skin side loses protection. After the clever air pressure 1shenuitiofUnproved, 2.3 string into the JUZQO50A undercurrent smart clever when the excitation current is lower than 65 mountain, its normally closed contact point is normally open, that is, the 篼 篼 跳 跳 跳 , , , Jump, that is, loss of magnetic protection. In the figure, the parts can be made of glued wood with a thickness of 3~5. It is fixed in the excitation cabinet, which is convenient and simple to install. It has been used for many years and the action is reliable, ensuring the safe operation of the air compressor. If you don't have a DC intermediate dimension electrical appliance or a DC time dimension electrical appliance, you can also introduce a V or 380V power supply, as shown in Figure 3. Install the 2ZJl normally open contact into the high voltage cabinet jump circuit. Equal role. When using electromechanical equipment at a specific construction site, it is necessary to pay attention to the analysis of the pre-conditions for the specific use of electromechanical equipment, and pay attention to the potential safety hazards of inorganic electricity. Qiao Zhiyong. Suggestions for working hard in the business cabinet to prevent electricity. Rural electrician, 199 Rukou Liusi Village. Analysis and prediction of heating accidents in closed high voltage cabinets. North China Power Technology, 2001,
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