When studying the organization of repairs, it is advisable to analyze the defects, dividing them into mechanical and electrical. This is because such a division allows you to optimize the range of tools and test equipment at the workplace.
The technological process of repairing electrical equipment is approximately the same as in repairing arc equipment. The main difference is the mandatory pre-repair tests and specific insulation and winding work.
These works include an external inspection and testing of electrical equipment to determine its condition (identify defects) and preliminarily establish the scope and nature of repair work.
During an external inspection, the condition of the main parts of the machine is checked. The rotor (armature) is turned by hand to check its grazing on the stator, seizure of bearings, etc. The condition of the bearings is judged by the radial and axial clearances in them, which are measured during the inspection. Be sure to measure the air gap between the stator and the rotor (armature).
If no serious damage is found by external inspection, the machine is tested. The pre-repair test program includes:
- checking for breaks and soldering in windings and leads;
- measurement of insulation resistance of windings relative to the case and between themselves;
- test of the dielectric strength of the winding insulation relative to the case and between each other;
- Test of electrical strength of internal insulation;
- testing the machine in idle mode.
The idling test is only carried out if the machine can be repaired without changing the windings. The no-load test is carried out at a rated voltage for 30 min. The no-load current is measured in each phase, and its arithmetic mean value is determined, which is taken as the actual no-load current. Irregularity of no-load current in phases should not exceed 5%.
Repair of relay regulators, transistor switches, and electronic control units
The failures of such electronic components, relay regulators, and transistor switches are mainly caused by the failure of Zener diodes, transistors, and diodes. Therefore, in the repair of these products, the same technological methods are used in the production of electronic components. Find your local electrical contractors in Lewisville, TX today.