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1 Introduction Recent years, the power line Communicate Very rapid technological development has now entered the initial application stage. PLC systems take full advantage of the broad line power system resources, through technologies such as OFDM power line can be different in the same channel bandwidth to transfer data. However, due to the transmission grid is the strong power and stability of the network than the traditional communication network is much less, making power line communication lines very complex electromagnetic environment. This has a higher power line communication system requirements of electromagnetic compatibility, EMC Technology has become a key technology needed to achieve one of the PLC.
2 The International Organization for Standardization on the PLC of the situation in the world, IEC of CISPR / I branch and the ITU-T and other international organizations on the PLC, EMC has done a lot of relevant standards and discuss the corresponding technical requirements. Europe since 2000 began to study the technical framework for PLC systems and technical standards and has made some progress. Main relevant international organizations CENELEC and ETSI, the former focusing on electromagnetic compatibility, which focused on unified communications technology standards.
2.1IEC/CISPRI Branch PLC equipment is information technology equipment, should be consistent with IEC/CISPR22 "information technology equipment, and methods of measurement of radio interference limits" requirement. However, due to the extraordinary mode of PLC equipment, the conduction disturbance can not meet current standards. In 2002, the IEC meeting, had suggested to the CISPR22 conducted for the PLC, modify, add a dedicated device for the PLC "multi-purpose port", which is defined as: low-voltage distribution network to connect to support the data transmission and communication, combination of telecommunications features port and power port port. For the PLC equipment, the paper recommends that require it to interfere with both the transmission power to meet the port limits of existing standards, but also to meet the telecommunications port limits. This interference of multi-purpose port Test Will be carried out twice: as the power supply port, with the usual V-network testing, required to meet CISPR22 Table 1 and Table 2 limits. As a telecommunications port T-network with the new test requirements to meet CISPR22 Table 3 and Table 4 limits. This test method is based on the following principles: consumer products, non-symmetrical power source of interference, the interference it generates a network with V-test is very appropriate.
Contrast, common-mode signals to communicate with the telecommunications port, it generates interference than the differential mode interference signal generated by much smaller. T-network is very suitable for the measurement of common mode interference, because the appropriate network parameters can provide the signal from differential mode to common mode signals required longitudinal conversion loss. According to the above theories, the paper proposes to carry out major changes to the CISPR22, increasing the content of a large number of the multi-purpose port, and associated test equipment requirements, test requirements and test methods of layout. However, this proposal did not receive final passage. All members attending the meeting on the proposals differ greatly, are: part of the CISPR PLC members that the relevant content should be transferred to CISPR / A branch responsible for part of the members of this argument, that the PLC should stay in research or I branch in. Some members of the CISPR/I/44 / CD The proposed method can completely avoid the PLC equipment on the adverse impact of other equipment skeptical. Some members think that this test method violates the CISPR22 the "measured device should work in the maximum emission state" principle. Some members think that the situation around the world, not the same power to determine an appropriate value of LCL is very difficult. Subsequently, in 2005, CISPR meeting, CISPR / I established a working group responsible for the extraordinary standards of PLC-related research. The working group will be responsible for continuing research on CISPR22 related changes, including the definition, limits, test conditions and test methods and so on.
Extraordinary group released a total of 7 were prepared to related technical documents. March 2006 the organization issued its first paper on network equipment installation PLT structure. Main described the following:
1, network topology, in particular low-voltage power grid topology. I am an expert from China Toys Suppliers, usually analyzes all kind of industries situation, such as silent dog whistles , animal exercise pen.
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