Recently, a construction worker of Zhongshan Changhong Project was killed by direct current electric shock while connecting the component array. The specific reason is under investigation.

On May 26, 2015, the solar panels on the roof of Apple's Arizona factory caught fire, and thick smoke billowed from the scene. The fire department dispatched more than 100 firefighters to control the fire in 30 minutes.

In 2014, a Queensland company sold a potentially unsafe DC switch, causing at least 70 fires in a solar system on a customer's premises. In China, the phenomenon of fire in the power station caused by the quality of the DC switch also occurs from time to time.

Photovoltaic power plant engineering is a complex and huge system engineering, and any link in it may lead to safety accidents. Therefore, the frequent occurrence of quality problems in photovoltaic power plants will undoubtedly greatly reduce the power generation capacity of the power plants. In recent years, the frequent accidents of photovoltaic power plants have to make us re-examine. The more reliable the equipment, the lower the end-to-end cost of the power plant. In addition to the core components such as photovoltaic modules and inverters, which pose a threat to the quality of the power station, the small component of the photovoltaic DC switch also plays a vital role in the smooth operation of the photovoltaic power station.

The important role of photovoltaic DC switches

It is understood that some manufacturers currently use AC circuit breakers on the DC side in pursuit of low cost when selecting components for inverters and combiner boxes. The power is far from enough, and it is easy to cause overheating, leakage and sparks, and even a fire in the power station in severe cases. The operating voltage of the photovoltaic DC switch is relatively high, the DC current does not cross the zero point, and the difficulty of arc extinguishing and breaking of the DC system is far greater than that of the AC system. , which also increase the risk of electric shock and fire accidents. Therefore, in the photovoltaic power station system, the photovoltaic DC switch plays an important role!

Wenzhou Feimai Electric, as the only real photovoltaic DC switch manufacturer in China, can provide various types of DC switches, which can be applied to almost every application. Considering the angle, this type of switch has the following characteristics:

In the process of construction, installation and commissioning, the DC switch is in the "off" state. At this time, the DC switch can be locked and locked in the "off" state to prevent misoperation and cause accidents.

The design of the real DC switch, spring storage, arc-extinguishing grid, shell grounding, etc., makes the turn-off time within 5ms, the arc-extinguishing effect is better, and the occurrence of accidents such as leakage and fire is effectively prevented.

Imported material, 2 5mm shell wall thickness, 3mm sealing strip thickness, IP66 protection grade, -25°C~+70°C working temperature, almost suitable for all kinds of high cold, high heat, high humidity, partial acid, partial alkali, partial salt Wait for a bad environment.

The maximum working voltage is 1500V, and it supports the design of 6-channel MPPT at most. Various models are available. It is suitable for various combiner boxes, inverters and other electrical and gas equipment.

For the quality problems of photovoltaic DC switch products, excellent suppliers, high-quality materials, rigorous design, and strict quality inspection standards are indispensable.

The new intelligent fire linkage switch can achieve double isolation

In addition, Philips is also actively developing a new type of intelligent fire-proof linkage switch. This DC switch is connected to the AC switch through a separate cable. When the AC power is disconnected, the relay on the DC side will automatically cut off due to the loss of the AC power signal. Open the DC side circuit and play the role of double isolation of the DC/AC circuit. The fire-proof linkage switch has the following characteristics:

1. Safer

Firefighters can directly control the AC distribution box, so that the AC switch and the DC switch are both disconnected, so that all AC cables and DC cables will be cut off from the power supply, so that they can be operated completely without electricity to ensure safety.

2. The way of disconnecting the DC switch is better, more convenient and quicker

The solar panel is generally installed on the roof, and the DC switch is installed as close as possible to the solar panel, so that firefighters can realize the quick and effective double disconnection of the AC and DC circuits without rock climbing.

3. Reduce the DC voltage

The DC voltage of the rooftop photovoltaic system is generally 150V~800V, and multiple DC switches can be connected in series between the same-string solar panels. When the switch is disconnected, the system DC voltage is divided into several sections, which greatly reduces the high DC system voltage. risk, and can be directly sprayed to extinguish the fire in the event of a fire.

4. The installation method is convenient and fast

Firefighters can directly control the AC power distribution box, so that the AC switch and the DC switch are both disconnected, so that all AC cables and DC cables will be cut off from the power supply, so that they can be operated completely without electricity to ensure safety. And when the mains power is restored, the DC switch will automatically turn on and return to the conducting state.

The reliability and stability of the photovoltaic DC switch is not only related to the safe and reliable operation of the photovoltaic power distribution system, but also to the stable power generation and income of the photovoltaic industry. The philosophy of Philips switch is: Switch to Safety! It is safer to have him!