As an important safety guarantee for photovoltaic maintenance, anti islanding devices are also required by local power grid companies to install anti islanding devices in photovoltaic grid connected public transformer area. Local power equipment manufacturers also think this is a good business opportunity, but most manufacturers do not understand the core technology.
With the rapid rise of household photovoltaic in recent years, the state pays more and more attention to the safety of photovoltaic grid connection. As an important safety guarantee for photovoltaic maintenance, anti islanding devices are also required by local power grid companies to install anti islanding devices in photovoltaic grid connected public transformer area. Local power equipment manufacturers also think this is a good business opportunity, but most manufacturers do not understand the core technology and begin to copy and forge one after another, which directly brings great potential safety hazards to photovoltaic grid connection, It also brings great potential risks to users. Because once there is a problem, there will be casualties. Next, the author will talk about the situation of illegal equipment manufacturers and how to avoid this potential risk.
The first kind of illegal manufacturers: at present, some illegal manufacturers directly go to Nari solar to buy a sample, and then copy it by themselves, but they do not know the core technology, resulting in the heating of disturbed load. If the heating of disturbed load occurs, it means that they do not understand the core technology at all, the manufactured products are unqualified, and it is impossible to force them to stop the core role of inverter.
The second kind of illegal manufacturers: they sell anti islanding devices as anti islanding devices. In fact, the two have essential areas. The anti islanding device is a grid connected microcomputer protection and a single device; The anti islanding device side is a cabinet. The anti islanding device mainly includes a complete set of equipment composed of rcx-9390k load special controller, disturbance load, grid connected special circuit breaker and some related small switch accessories plus a 304 stainless steel cabinet. If a product similar to microcomputer protection device is found with the name of anti islanding device, it must be false.
The third kind of illegal middlemen: middlemen include dealers, engineering contractors and general contractors. In short, they are units or individuals other than Party A who participate in the project construction for profit. Some illegal businessmen may collude with illegal manufacturers for profit, make mistakes and deceive users with fake and cheap things. The anti islanding device consists of a 304 stainless steel, a special controller for rcx-9390k load, three disturbance loads, three special operation switches for photovoltaic grid connection, plus the intermediate relay, time relay, wire rod and related accessories, factory packaging, freight and cost must be more than 10000, so something of several thousand yuan can hardly be true.
Such as exposing those illegal manufacturers to avoid potential safety hazards,
1. Ask the manufacturer what is the working principle of the anti islanding device and how to avoid stopping the inverter when there is an islanding phenomenon?
2. Ask the manufacturer, how does an anti islanding device control the PV of several or even hundreds of households under the public transformer area?
3. Ask the manufacturer what is the core role of rcx-9390k anti islanding special controller and how it can be used with disturbed load and grid connected switch.
4. It should be understood that the anti islanding device is a cabinet, which is composed of a 304 stainless steel cabinet, a rcx-9390k load special controller, three disturbance loads and three photovoltaic grid connection special operation switches. If there is any deficiency, it must be a fake or unqualified product.
If the relevant manufacturers can make the above principles clear, it shows that the manufacturer still depends on the general. If not, there must be a problem and be careful.