Power Relays Common Problems and Handling Measures
　　In the process of using relays, due to various reasons, such as poor product quality, improper use, poor maintenance, etc., a variety of failures often occur. For electronic relays, because there are still few types used in locomotives, their failure and handling as well as inspection and testing have their own characteristics. The following are common problems and measures to deal with power relays.

　　Contact loosening back to cracking

　　The contact is the electrical contact parts of the relay to complete the switching load, some products are riveted with the contact pressure, the main drawback is the contact is loose, contact cracking or size position deviation is too large. This will affect the contact reliability of the relay. Flooding eradication point loosening, is the reed and contact with the contact department size is not fair or manipulator of the riveting pressure adjustment improperly caused by. Contact cracking is caused by the material hardness too high or too much pressure. For different materials of contacts using different materials process, some hardness of the contact material should be annealed, in the contact manufacturing, riveting or spot welding. Contact manufacturing should be careful, because the material has tolerances exist, so each blocking length should be decided after test touch. Contact manufacturing should not be flooded with flying edge, pad injury and not full phenomenon. Contact riveting deviation is the manipulator will touch the tool is not accurate, the upper and lower touch has a misalignment caused. Contact damage, pollution, is not clean up the touch tool on the oil pollution and iron filings and other things caused. No matter what kind of malpractice, will affect the working reliability of the relay. Therefore, in the contact manufacturing, riveting or welding process, to comply with the first piece of inspection middle sampling and ultimate inspection of the self-inspection delineation, in order to improve the quality of assembly.

　　Glass insulator damage

　　Glass insulators are made of metal pins and glass sintered, in the inspection, assembly, adjustment, transportation, cleaning, easy to bend the pins, glass insulators off the block, cracking, and cause gas leakage and when the insulation and voltage resistance function decreases, pins rolling will also cause contact reed displacement, affecting the product reliable through and through. This requires the assembly of the manipulator in the entire process of relay production should be light, parts should be neatly arranged in the transfer box, assembly or adjustment, do not promise to wrench or twist the lead foot.

　　Relay parameters are not unstable

　　Electromagnetic relay parts are riveted with a proportion of the department, the main problem is riveted at the loose or poor bonding strength. This problem can make the relay parameters are not unstable, high and low temperature parameters change, mechanical vibration resistance, shock resistance is poor. Relay manufacturers believe that the cause of this fault is mainly riveted parts super poor, improper placement of parts, work touch tool quality disagreement or incorrect installation. Therefore, before riveting and welding to carefully overhaul the tool and the riveted parts are in line with the requirements.

　　Electromagnetic system riveted parts deformation

　　After riveting parts bending, twisting, pier thick black to the next process of assembly or adjustment caused by the problem, and even cause scrap. The cause of this problem is mainly riveted parts are too long, too short or riveting force is not average, touch the assembly deviation or design size error, improper placement of parts caused. When riveting, workers should first check the size of the parts, appearance, touch tool is correct, if the touch tool is not in place will affect the quality of the assembly of the electromagnetic system or core deformation, pier coarse.

　　Coil failure

　　Relays with a wide range of coils, there are outsourced, there is no outsourcing, coils should be placed in a single piece separated in a special appliance, if the collision cross-connected, in the separation will cause a broken wire. In the electromagnetic system riveting, hand press and press pressure adjustment should be moderate, too much pressure will cause coil breakage or coil frame cracking, deformation, winding breakdown. Too little pressure will cause the winding loosening, magnetic loss increases. Multi-winding coils are generally made with different colors of leads for the head. When welding, should pay attention to distinguish, otherwise it will cause the wrong coil welding. Coils with beginning and end requirements are generally marked with a marking method to indicate the beginning and end. Attention should be paid when assembling and welding, otherwise it will cause the opposite of the relay level.