1 geographical feature climate action
Mainly refers to the elements of the altitude, ambient temperature, humidity, and electromagnetic interference. Consider the control system of general applicability, taking into account the need for many years
Particularity after year of reliable operation, the device key parts must be selected with high insulation, strong anti-electrical properties sealed type (metal or plastic cover sealed type metal cap sealing products superior to plastic products) intermediate relays. Because only fully sealed relay only has excellent long-term tolerance performance in harsh environments, good electrical contact stability, reliability and switching load capacity (without external climate impacts).
2 mechanical action elements
Mainly refers to the stress vibration, shock, impact and other factors. Control system is mainly taking into account the effect of anti-seismic stress, mechanical stress ability, should use balanced armature mechanism small intermediate relay.
3 excitation coil input parameters Factors
Mainly refers to overdrive, less motivation, low motivation and high voltage (220 V) output isolation, temperature changes, remote wired incentives, incentives and other parameters of electromagnetic interference factors, which are to ensure reliable operation of the power system automation equipment must be carefully considered factor. Energizing relay prescribed by small incentive is to make sure that it is reliable, stable work necessary conditions.
4 contact output (for access circuit) parameter elements
Mainly refers to the nature of the contact load, such as a lamp load, capacitive load, motor load, inductors, contactor (relay) coil load, resistive load and the like; Contact load values ??(open-circuit voltage value, closed-circuit current magnitude ), such as low load, dry circuit load, low current load, high current loads.
Any automation equipment must effectively identify the actual nature of the load required, the size of the load values, selection of suitable relays is particularly important. Failure relay or reliable unreliable, mainly referring to the contact can be completed under the switching circuit functions. If the actual load switching relays with the choice of switching loads provisions inconsistent, reliability will be impossible.