It may need a tremendous amount of network devices to build a complete video surveillance system, together with the complicated cabling networks that connecting all the equipment. This may cause the complexity of electromagnetic interference and affect the total performance of the system.

Therefore, electromagnetic compatibility of the electronic equipment should not be negligible when the video surveillance system is applied to environments with high-voltage current, such as power plant, factory, transportation and infrastructure.

EMC stands for electromagnetic compatibility. This means electromagnetic energy generated by the equipment is neither interfering to other equipments nor accept the electromagnetic energy interference of other equipment.

EMC includes two aspects: One is electromagnetic interference (EMI). It refers to the equipment in normal operation process towards the environment in which the electromagnetic interference cannot exceed a certain limit; another is electromagnetic sensitivity (EMS).

It refers to the equipment in environments where electromagnetic interference immunity.

Designed in compliance of high EMC standard is also a key index of quality and performance of an excellent network product.

In the meantime, EMC design of the components and PCBA are also needed to be taken into consideration.

Taking substations for example, when the high-voltage convertor, circuit breaker and relays are operating, they will step up the voltage to several hundred thousand volts, which may generate huge electromagnetic interference to the equipment in the substation, and cause unpredictable damages.

Transportation systems such as train and subway are operated by electric power.

The electromagnetic interference can be sorted by environments outside the cabin, the electronic equipment in the cabin, the main transformer substation and the backup transformer substations along the rail and other electrical substations.

The main electrical system provides the power for the cars to operate on. The auxiliary power system processes the electrical power and distribute to electronic equipment on the cars.

Due to the fact that the on board units on the trains have higher voltage input, besides resisting the EMI of other equipment, it is also crucial to sustain the huge electromagnetic radiation generated by the train itself.

When communication equipment is installed to such a complicated environment, the test of the electronic equipment will become more severe.

Read the complete article at the link below to see the 5-Key Considerations in Designing EMC Products.