What are the electrical life requirements of power directional relay?
[answer] 1. The relay contact should be able to make and break the circuit with DC inductive load (time constant of 5ms) with voltage not greater than 250V and current not greater than 1a, with breaking power of 10W.
2. During the test, it is not allowed to touch the contact. The speed of the test should consider that there is no harmful heat accumulation or ion accumulation on the contact, which is generally carried out at no more than 1 time / s.
3. In the process of electrical life, the movable system of the relay should act and return reliably every time, and the contacts should be reliably connected and disconnected every time (there should be no stable arc between the contacts), that is, the relay should have 100% reliability in the electrical life test. After the end of the test, the allowable increase value of the error in 2.4-2.12 and 2.16 shall be specified by the product technical conditions, and the insulation withstand voltage test value shall be allowed to reduce to 75% of the specified value.
The above contents are arranged according to the problems encountered in the actual work of the students for reference. If there are any problems, please communicate and correct them in time.