Saver is divided into: capacitive, transformer, duty cycle (change) type. AC contactor Saver corresponding supporting the use of the contactor in the DC state retention operation, air circuit breaker so to save energy. Saver AC contactor solenoid due to electromagnetic energy and the internal device Saver limitations generally applicable to the rated current of 60 ~ 600A AC contactor, lower than 60A AC contactor because the stored electromagnetic solenoid can run in DC maintain its pull; electromagnetic greater than 600A AC contactor can be easily generated so Saver damage internal components voltage stabilizer.
Contactor coil AC passed, it will produce a corresponding inductance, inductive influence of the size of the size of the current in the coil, AC solenoid coil inductance, the core is not closed when the inductance is small, a large current through , which is caused by the coil in the suction power of the largest timely reason. Circuit breaker When the AC contactor pull into the retention time, due to long-term work in the state coupled with the coil power consumption, temperature rise. AC contactor usually work long hours can produce 50 ℃ ~ 60 ℃ degree heat, the summer plus 30 ℃ ~ 40 ℃ ambient temperature of the coil temperature rise faster. Coil long period of high temperature operation, will accelerate the aging and even burned, AC contactor life will be shortened.
According to AC contactor coil power consumption characteristics of fast rise, by reducing the power consumption and temperature to save energy. According to the internal structure, saving coil is divided into: double winding type, current limiting resistor, double winding self-conversion conversion type and location. Works will use energy-saving coil is usually on its pulsating DC coil retention program run: pull winding generally larger diameter, fewer turns, and thus lower impedance, resulting pull current large; retention winding general smaller diameter, number of turns, current transformer the impedance of large, small and therefore holding current. Corresponding increase rectifiers and varistors and film capacitors, the AC contactor is energized to work in DC state, large starting current to ensure a reliable pull-electromagnetic systems, smaller holding current to reduce the retention power, thereby reducing the electrical losses and electromagnetic coil temperature of the system.
Energy-saving AC contactor
According to AC contactor structure, increasing as Power Saver, saving coil, mechanical locking device, electromagnetic system to the remanence (permanent magnet) retention type, etc., can play the energy saving effect. After contact with the tradition of saving energy, such as shown in Table 2.
Traditional CJ10, CJ12, CJ20 AC contactor, for example, for energy saving before and after comparison of the data, reflecting the energy saving effect.
In CJ20 / 400A / 3 year energy savings calculation: saving work properly before the contactor holding power for 180W, priced according to the average electricity tariff by 1 yuan / Kwh meter, working hours 12h / day:
Total power consumption before saving: 0.18Kw × 12h × 365 = 788 Kwh
After saving the total power consumption: 0.006Kw × 12h × 365 = 26 Kwh
Saving (annual electricity): 788Kwh - 26Kwh = 762Kwh
Cost-saving: 762Kwh × 1 元 / Kwh = 762 元
At present, energy-saving AC contactor has a certain market, but not enough popular, traditional exchanges and contacts currently in use on the dominant user. The main reason is the energy-saving type contactors expensive, the user can not accept the one-time investment, to be national policy to electric meter increase efforts on the promotion of energy-saving contacts, promote the wide application of energy-efficient contactors....
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