Contactors are commonly used to control the operation and stop of motors, pumps, and the like. Under normal circumstances, when the start button is pressed, the motor or the like starts to operate, and when the stop button is pressed, the power of the motor or the like is immediately cut off, and the motor or the like is stopped. The release time of the AC contactor is generally only a fraction of a second. If the stop button is pressed, the release time after the contactor coil is de-energized is significantly extended or not released, and the motor does not stop or stop immediately, that is, the contactor is out of control (sticking phenomenon). This can cause accidents such as equipment damage, electric shock, and the like. For example, when an electrician in a factory replaces the fan motor, the power switch is not pulled off, but only the stop button is pressed, so that the motor terminal does not have electricity at this time, but the electric shock is caused by electric shock. In fact, after pressing the stop button, although the contactor is heard to sound, but because one phase of the contact is welded, the power supply passes through the contact to the motor terminal.
The reasons for the contactor adhesion are: poor quality of the contactor (such as improper use of materials, small contact capacity, etc.), iron core heating, contact welding, oil stain on the suction surface, deformation of the plastic parts, environmental pollution.
In order to prevent contact failure of the contact, it should be prevented for the above reasons. If qualified products are used, increase the contactor capacity, reduce the spark of the contactor, remove the grease on the suction surface, improve the use environment, and strengthen maintenance.
In order to prevent the electric shock caused by the contactor, in addition to preventing the contactor from sticking to the fault, when installing or repairing the circuit with the contactor control, the power switch should be cut off first. Do not press the stop button to work.
Sunket has launched HJT solar modules, which have the following 10 advantages:
1) Higher conversion efficiency: higher installed capacity within a limited installation area and lower BOS cost;
2) Higher reliability: Our product design is mature and has been tested by the market. Compared with large-sized components, it is more effective in resisting wind load and snow pressure, and it is not easy to cause frame damage, glass burst, and a large number of hidden cracks to cause excessive attenuation of components. ;
3) Low attenuation rate: 90% power line quality guarantee is still available after 30 years of use;
4) Low temperature coefficient of -0.24%: 2%-3.9% higher power generation per watt compared to conventional PERC;
5) Better low-light power generation performance: HJT adopts N-type silicon wafer technology, which generates 1% more electricity per watt compared to single crystal PERC;
6) No PID, no LID attenuation: lower attenuation of components in the whole life cycle and higher power generation;
7) Double-sided rate as high as 90%+: the backside of our heterojunction modules can have more than 90% and at least 423W of backside power generation, and the power generation superposition is higher after double-sided installation;
8) Lower LCOE: At present, compared with PERC single crystal technology, our heterojunction technology is more advanced, achieving the lowest LCOE of power generation, faster payback period and maximum benefit;
9) Good matching: suitable for photovoltaic grid-connected inverters and photovoltaic tracking brackets used in domestic mainstream;
10) Cost-effective.
HJT Solar, HJT Solar Panel, HJT Solar PV Module, HJT Solar Module, HJT PV Module
Wuxi Sunket New Energy Technology Co.,Ltd , https://www.sunketsolar.com