GB/T 17625.9-2016Electromagnetic compatibility -- Limits -- Signalling on low-voltage electrical installations -- Emission levels, frequency bands and electromagnetic disturbance levels (English PDF)

1 Scope 1

2 Normative references 1

3 Overview 1

4 Terms and definitions 2

5 Band 2

5.1 3kHz~9kHz frequency band 2 5.2 9kHz~95kHz frequency band 3

9 Improper operation 6

Appendix A (Normative Appendix) Measurement of output signal level and conducted disturbance level (3kHz~30MHz) 10

Appendix B (informative appendix) Basic principles of artificial power network for measuring output signals with a frequency lower than 9kHz 11

Electromagnetic compatibility limit Signal transmission on low-voltage electrical facilities Emission level, frequency band and electromagnetic disturbance level

1 Scope

This section applies to electrical equipment that uses 3kHz to 525kHz signals to transmit information on low-voltage electrical facilities.

Implementation includes both public power supply systems and user buildings.

This section specifies the frequency band, the limit of the terminal output voltage in the working frequency band, conduction and radiation for different applications (when appropriate) the limit of disturbance is also given in the measurement method.

This section specifies the disturbance limit in the frequency range from 3kHz to 400GHz.

This section does not specify the modulation method, coding method and functional characteristics of the signal.

This section does not include environmental requirements and tests.

Note. Compliance with this part does not mean that it is allowed to establish communication with facilities outside the user's building, or through a public power supply system that may not allow communication Establish communication with other users.

3 overview

This section has two purposes.

---Prevent the power grid signal transmission equipment from interfering with radio communication service equipment and other equipment connected to the power grid;

---Limit the mutual interference between different power grid signal transmission equipment connected to the same power grid.

For the first purpose and above 150kHz, the maximum voltage limit of the output terminal of household appliances is determined by GB 4343.1-2009 Given, the maximum voltage limit of the output terminal of information technology equipment is given by GB 9254-2008.Although the above two limits are not specific the gate is suitable for power grid signal equipment, but they have been used as a reference for specifying the maximum output level in this section. However, it should be noted that the above the above-mentioned standards involve unintentional emission, and the power grid signal transmission belongs to intentional emission. Moreover, according to some signal transmission methods, the signal level it should be higher than the possible noise level to successfully achieve signal transmission.

Below 150kHz, there is no corresponding reference, the limit specified in this part is considered appropriate and in line with the International Electrotechnical Commission's wireless Principles of the Special Committee on Electrical Interference (CISPR). In any frequency band, another factor to consider is. in some countries, it may have been proposed the regulations for the maximum emission level of signal transmission should be followed.

For the second purpose, three types of technologies can be used to limit mutual interference between different signal transmission systems.

a) Physical isolation, using filter isolation to limit the mutual interference of the transmission or differential signal injection system;

b) For different applications, use allocated frequency bands to achieve isolation;

c) In order to avoid contention for information resources, for different application situations, different and separate addressing mechanisms are used to reach a common agreement.

The International Telecommunication Union (ITU) Radio Regulations stipulate the frequency of radio communication services in the frequency range from 9kHz to 400GHz the basic principles of distribution and use, as well as the definition of communication services, the frequency allocation table is included in the rules. This section considers the frequency bands of different applications Allocation to avoid interference with radio communication services. However, in the case of actual harassment, additional preventive measures need to be taken.

ITU rules specify 3 areas, and the frequency allocation in these areas is different.

When the equipment within the scope of this part is used in a specific area, and its requirements are different from the limits stated in this part, it should be stated in the report Ming (as in Chapter 7). However, if this description is omitted, it does not mean that the specified frequency band, output voltage, Limits for conducted or radiated disturbance.

In the ITU1 zone, the AM broadcasting frequency band starts from 148.5kHz, and in order to optimize the use and consideration of the frequency band that allows power grid signal transmission Taking into account that there is no common agreement between the power supplier and the user for use1), all the provisions of this section are applicable, and the equipment needs to be considered Out-of-band emissions may fall in the frequency bands available to other devices in order to limit possible mutual interference.

1) The original information of the IEC standard. The member states of the European Committee for Electrotechnical Standardization (CENELEC) have adopted the above-mentioned b) technology and agreed to the supplier/user Use separate frequency bands.

2) IEC standard original information. In the United States, the Federal Communications Commission (FCC) allows AM broadcasting (535kHz~1705kHz band) to start at frequencies above for power grid signal transmission, although there are strict restrictions on the maximum output level, this is a special case and is not included in this section.

In ITU2 and ITU3, the AM broadcasting frequency bands start at 525kHz and 526.5kHz, respectively. Grid signal transmission assigned the frequency band is not used, the method used to limit mutual interference may be outside the scope of this section, especially the part that needs to specify the agreement. In these Region, Chapter 5 is not applicable. As for Chapter 7, the out-of-band emission of the frequency band used for power grid signal transmission may not be important because it cannot interfere with wireless Telecom business. However, the possible interference caused by the out-of-band emission to other equipment connected to the power grid should be considered. Therefore, it should comply with the provisions given in Chapter 6.

The relevant limit 2).

Unless permitted by regulations (see Chapter 9), common mode injection should not be used.

4 Terms and definitions the terms and definitions defined in GB/T 3784-2009 and GB/T 4365-2003 apply to this document.

5 band

Only applicable to ITU1 area, the frequency band of ITU3 area is still under consideration.

5.1 3kHz~9kHz frequency band the frequency of this band should be restricted to the power supply department.

However, under the authorization of the power supply department, the frequency of this frequency band can also be used for signal transmission in user facilities.

5.2 9kHz~95kHz frequency band the frequency of this band should be restricted to the power supply department and authorized persons.

5.3 Frequency above 95kHz the frequency of this band should be restricted to users.

6 The output signal voltage of the transmitting device the output signal voltage of the transmitting equipment in the ITU3 area is under consideration.

6.1 Maximum output signal level 6.1.1 3kHz~9kHz frequency band the maximum output signal level should be limited as follows.

a) Differential mode equipment when measured according to 6.2.1a), the maximum output signal level is 134dB(µV).

b) Common mode equipment when measured according to 6.2.1b), the maximum output signal level injected into the user network is 134dB (µV), and the maximum output signal level injected into the power supply department network the maximum output signal level is 89dB(µV). See Chapter 9.

6.1.2 9kHz~95kHz frequency band A signal with a bandwidth less than 5kHz is a narrowband signal, and a signal with a bandwidth greater than or equal to 5kHz is a wideband signal. The signal bandwidth should be

6.3 Take measurements.

a) Narrowband signal when measured according to 6.2.2, the maximum output signal level at 9kHz is 134dB(µV) and decreases linearly with the frequency logarithm to 95kHz

b) Broadband signal

When measured according to 6.2.2, the maximum output signal level is 134dB(µV).

In addition, when using a.200Hz bandwidth peak detector to measure, the signal amplitude should not be greater than 120dB (µV).

6.1.3 95kHz~148.5kHz frequency band when measuring according to 6.2.2, according to the purpose of the equipment, the maximum output signal level should be limited as follows.

a) General purpose. 116dB(µV) when the equipment meets the output level limit, the equipment should be marked as "116 equipment".

b) Special purpose (such as industrial environment). 134dB(µV) when the equipment meets the output level limit, the equipment should be marked as "Class 134 equipment".

Note. The use of Class 134 equipment may require prior notification to or permission from the relevant management agency.

6.1.4 148.5kHz~500kHz frequency band the root mean square value of the maximum output signal level decreases linearly with the logarithm of the frequency from 66dB (µV) at 148.5kHz to 500kHz 56dB(µV).

6.1.5 500kHz~525kHz frequency band the maximum output signal level is 56dB(µV).

6.2 Measurement of output signal in all measurement methods, an artificial power supply network is required. See Appendix A for detailed network parameters applicable to different frequency bands.

Note. For differential mode transmitting equipment, the output value measured according to 6.1 is 6dB smaller than the true differential mode output signal.

6.2.1 3kHz~9kHz frequency band it should be measured as follows.

a) Differential mode equipment Connect the equipment as shown in Figure 1, and its output level should be measured at points A and A1 to ground.

b) Common mode equipment Connect the equipment as shown in Figure 2.The output level value connected to the user network should be measured at points B and B1 to the ground, and connected to the power supply department the output level of the network should be measured at points A and A1 to ground.

6.2.2 Frequency band above 9kHz it should be measured as follows.

a) Differential mode equipment for continuous working differential mode equipment, the output voltage should use peak detector receiver in accordance with 4.2 in GB/T 6113.102-2008 the specified (50ohm/50µH 5ohm) manual power supply network port measurement exceeds 1 min. The bandwidth is greater than or equal to the output signal band of the transmitting device A wide spectrum analyzer is suitable for this measurement.

b) Common mode equipment Under consideration.

6.3 Measurement of bandwidth in 6.1.2 and 6.2.2a), the output signal spectrum is measured with a peak detection spectrum analyzer with a bandwidth of 100 Hz.

The working bandwidth of the transmitting device and the maximum output signal amplitude should conform to the manufacturer's technical specifications.

The spectral bandwidth (denoted by B, in Hz) is defined as the frequency interval length of 20dB lower than the maximum spectral component (see Figure 3).

6.4 Identification of output level the level of output level should be marked on the device.

7 Harassment limits

Limits in the ITU3 area are under consideration.

The limits given below apply to frequencies outside the operating frequency bands of signal transmission equipment listed in 6.1.1, 6.1.2, 6.1.3, 6.1.4, and 6.1.5.

rate. In order to perform disturbance measurements, the frequency bands in 6.1.1 and 6.1.2 should be regarded as one frequency band. The test conditions are given in Chapter 8.

Note. The selection of the limit value must comply with the limit value that CISPR has agreed to or is under consideration for the protection of radio communication services.

For the frequency range above 9kHz, the measurement receiver should comply with GB/T 6113.101-2008.Measurement reception in the 3kHz~9kHz frequency band the machine should have a narrow-band peak detector with a bandwidth of 100 Hz.

7.1 Conducted disturbance limit the measurement method should be the same as that described in GB/T 6113.201-2008.Details of artificial power network suitable for different frequency bands See Appendix A for details.

7.1.1 3kHz~9kHz frequency range the peak value is not higher than 89dB(µV).

Note. For equipment using this frequency band in the user's building, the limit also applies to the in-band disturbance measured at the power supply end of the user's building according to 6.2.1.

7.1.2 9kHz~150kHz frequency range the quasi-peak value decreases linearly with the logarithm of the frequency from 89dB(µV) at 9kHz to 66dB(µV) at 150kHz.

7.1.3 150kHz~30MHz frequency range See Table 1 for the quasi-peak and average values of the disturbance limits in the frequency range of 150kHz~30MHz.

7.1.4 Frequency range above 30MHz Above 30MHz, there is no applicable terminal voltage disturbance limit.

7.2 Radiated disturbance field strength limit the measurement method should be the same as that described in GB/T 6113.203-2008.The equipment under test shall comply with the limits in Table 2.If test the reading of the quantity receiver fluctuates near the limit, then the reading at each measurement frequency point should be observed for at least 15s; the maximum reading should be recorded, and the those short and isolated high readings should be ignored.

7.3 Disturbance power limit the disturbance power measurement method in GB 4343.1-2009 can be used to replace the measurement of radiated disturbance field strength, and the corresponding limits are shown in Table 3.

If the measured value is close to the limit in Table 3, the radiated disturbance field strength measurement should be performed to ensure compliance with the limit in Table 2.Similarly, about for any dispute over the level of disturbance, the radiated disturbance field strength should be measured, and the limits in Table 2 shall prevail.

7.4 Other requirements to limit harassment If there are other applicable radio frequency disturbance requirements, the equipment should also meet.

8 Test conditions

The measurement of output and spurious output should be carried out in accordance with the methods in Chapter 7 and Appendix A. The working conditions of the equipment are as follows.

a) The measurement should be carried out under the condition that the manufacturer's technical specifications can produce the maximum output or the maximum spurious output.

b) The equipment should be powered at the rated voltage. If the spurious output changes significantly with the supply voltage at any frequency, then try the test should be carried out at a frequency point in each frequency range at 0.9 times to 1.1 times the rated voltage.

Equipment with more than one rated voltage should be tested at the corresponding rated voltage that produces the maximum output or maximum spurious output.

c) During the test, the power grid signal transmission and transmission equipment needs to be activated to generate the test signal.

The power grid signal transmission device that must be activated by another transmission device in the loop should be connected according to Figure 4.

Note. The test limit applies to individual equipment. Preventive measures should be taken to ensure that auxiliary equipment does not affect the test results.

9 Improper operation in some cases, interference generated by other electrical equipment may cause the power grid signal transmission equipment to malfunction. The installation of each device the operating instructions should provide guidance for correct use and warnings for improper use. When appropriate, each product should be firmly attached as the following warning.

The power grid signal transmission is strictly prohibited to be used to control equipment that is dangerous to people or property due to any improper operation or abnormal operation.

Common mode injection equipment may interfere with the normal operation of the leakage protection device, and may cause users to face serious safety risks. therefore, on the common mode injection equipment, (on the equipment or the instruction leaflet) there should be a clear written warning.

For safety reasons, this product is not allowed to be used in a residential environment. The use of common mode injection equipment in industrial and commercial environments requires the installer is responsible and should comply with legal requirements.

Appendix A

(Normative appendix) Measurement of output signal level and conducted disturbance level (3kHz~30MHz) this appendix provides information on the artificial power supply network used for the measurement of equipment output signal levels and conducted disturbance levels. All other things See GB/T 6113.102-2008.

A.1 Overview

It is necessary to use a V-shaped artificial power supply network to provide the specified high-frequency impedance at the end of the device under test, and to remove the unnecessary radio frequency signals from the power supply.

The signal is isolated from the test circuit.

GB/T 6113.102-2008 Appendix A provides examples of this type of artificial network, especially in Table A.1.

Body component parameters to achieve the frequency response curve of Figure 1a) and Figure 1b) of the applicable frequency range of this section.

For safety reasons, since the artificial network has a large capacity capacitor, the network used should be reliably connected to the reference ground, or use A power isolation transformer.

A.2 Specific impedance A.2.1 3kHz~9kHz frequency band the artificial power supply network should use the components shown in Figure 5.

Note. The impedance of the 0.47µF capacitor cannot be ignored. Because of the partial pressure caused by this impedance, the reading of the measuring device needs to be corrected.

The reason for the need to specify a network value different from GB/T 6113.102-2008 is given in Appendix B.

A.2.2 9kHz~150kHz frequency band the component parameters of the artificial power supply network should be consistent with the frequency band A in Table A.1 in Appendix A of GB/T 6113.102-2008, corresponding to (50ohm/50µH 5ohm) network.

A.2.3 150kHz~30MHz frequency band the component parameters should follow the (50ohm/50µH) V-type network in GB/T 6113.102-2008.Or specified in A.2 (50ohm/50µH 5ohm) network can also be used for the measurement of this frequency band.

Appendix B

(Informative appendix) the basic principle of artificial power network for measuring output signals with frequency below 9kHz B.1 Background 4.2 in GB/T 6113.102-2008 introduces an artificial power supply network for voltage measurement in the frequency range of 9kHz to 150kHz.

Appendix A of GB/T 6113.102-2008 gives an example of this type of network, including component parameters that can provide the required frequency/impedance diagram.

The network constructed according to these suggestions can meet the requirements of frequencies above 7130 Hz. For lower frequencies, the test found for resonance around 3kHz, the error exceeds 20%. Therefore, it is necessary to specify a measurement frequency band in 3kHz~9kHz to meet this part the required network, which can change the component parameters recommended in Appendix A of GB/T 6113.102-2008 as described below.

B.2 Artificial network for output voltage measurement at frequencies below 9kHz Fig. 6 shows the ideal impedance curve of the artificial power supply network, and Fig. 5 is the concrete realization including the power supply isolation part. This constitutes A network of (50ohm/50µH 1.6ohm) was created.