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Hits:Updated:2019-02-18 13:02:28【Print】
Low-voltage equipment refers to complete sets of equipment used in voltage grades of 380V and below. The latter is considered from a safety point of view, but the two are not contradictory, because in the power distribution system, the low-voltage electrical appliance refers to the 380V power distribution system. Therefore, in actual work, the low-voltage complete set refers to the voltage grade of 380V and below. Electrical equipment used in. Application: Low-voltage complete sets of equipment are widely used in power distribution, electric drive and automatic control equipment for low-voltage systems in power plants. As we all know, power generation itself consumes a lot of energy (referring to the power consumption of the plant). According to statistics, the energy consumption of low-voltage electrical appliances accounts for more than half of the total energy consumption of power plants. In recent years, with the adoption of large-scale complete sets of equipment and automatic control and automatic adjustment systems, the use of low-voltage electrical appliances has increased significantly. Therefore, in the maintenance of power plant equipment, the maintenance of low-voltage electrical appliances is an important part, regardless of the frequency, the importance of equipment or the workload, it is an important part of the maintenance work. There are many types of low-voltage electrical appliances in power plants, and this section will not introduce them one by one.
Just give you a brief introduction to common common equipment projects. First, the overhaul of low-voltage short-circuit: At present, with the continuous development of science and technology, the material continues to innovate, the equipment is relatively compact, durable, and has a high safety factor. The current equipment has been repaired to the disassembly-free, maintenance-free type. The following is an introduction to the inspection of the low-voltage switch with the maintenance of the system. a, short circuit device, pull the low voltage test. b. Short circuiter simultaneous test. c. Primary DC resistance test. d. Primary insulation resistance test. e, one-time withstand voltage test. f. Add lubricant to the transmission mechanism. g. Check the fuses. h. Check and verify the energy storage motor. i. Check the fork and spring once. j. Check, check and pull the brake speed. k, check, verify the secondary and auxiliary switches and contacts. Second, the automatic air switch maintenance: Automatic air switch is more complicated in structure than the contactor and magnetic starter, therefore, because it has a set of well-edited arc extinguishing device. The automatic air switch automatically cuts off the circuit when the circuit is overloaded, shorted, low voltage or lost voltage. Common automatic air switches are shown in Figure 1-1. a, combined, pull test. b. The transmission mechanism is added with lubrication. c, phase insulation resistance test. d, switch overcurrent test. e. Check the access point. f. Check the arc chute. g, overhaul the contacts. Third, the inspection of the knife switch: a, check the fixed, movable knife edge. b. Check the knife edge spring. c. Check the axle pin. d. Check the position and pull the brake position. e. Check and verify the transmission mechanism. f, phase-to-phase, ground insulation resistance test. Fourth, the electromagnetic contactor overhaul: a, check the magnetic coil contacts. b, magnetic coil DC resistance test. c. Check the contacts and the compression spring. d. Check the contact surface of the core and the core. e. Check the effect arc cover.
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