1. Geographical location and climatic factors

It mainly refers to factors such as altitude, ambient temperature, humidity and electromagnetic interference. Considering the general applicability of the control system and the particularity of taking into account the reliable operation for many years, the key components of the device must be fully sealed with high insulation and strong electrical resistanceFinder intermediate relayProducts (metal cover sealing or plastic sealing type, metal cover sealing products are better than plastic sealing products). Because only the fully sealed relay has excellent long-term ability to withstand harsh environments, good electrical contact stability, reliability and load switching ability (not affected by the external climate environment).

2. Mechanical factors

It mainly refers to stress factors such as vibration, impact and collision. For the control system, mainly considering the ability of anti-seismic stress and anti mechanical stress, a small finder intermediate relay with balanced armature mechanism should be selected.

3. Factors affecting the input parameters of the excitation coil

It mainly refers to parameter factors such as over excitation, under excitation, isolation between low-voltage excitation and high-voltage (220V) output, influence of temperature change, long-distance wired excitation, electromagnetic interference excitation, etc., which must be seriously considered to ensure the reliable operation of power system automation devices. Excitation according to the specified amount of excitation is a necessary condition to ensure the reliable and stable operation of the small finder intermediate relay.

4. Factors of contact output (commutation circuit) parameters

It mainly refers to the nature of contact load, such as lamp load, capacitive load, motor load, inductor, contactor (relay) coil load, resistive load, etc; Contact load value (open circuit voltage value, closed circuit current value), such as low-level load, dry circuit load, small current load, large current load, etc.