1 Overview

1.1 Scope

This standard applies to a single uninterruptible power supply ( UPS) connected to an industrial or public low-voltage grid or a UPS system consisting of several UPS interconnections and associated controllers/switches. They are intended to be installed in any location accessible to the operator or in an independent electrical location.

This standard is an EMC standard for products that takes precedence over all common standards in all respects and does not require additional testing.

These requirements are chosen to ensure that the UPS has the appropriate level of electromagnetic compatibility in public or industrial locations. However, these levels do not cover extreme conditions, which can occur anywhere, but with a low probability.

In order to adapt to the range of physical dimensions and power ratings of the UPS, various test conditions need to be considered.

As a stand-alone product, the UPS unit or UPS system should meet the relevant requirements of this standard, but does not consider the EMC phenomenon caused by any load connected to the output of the UPS equipment.

This standard does not contain a special installation environment, nor does it consider the failure of the UPS.

This standard does not include DC-powered electronic ballasts ( IEC60924 and IEC60925) or UPS based rotary units.

This standard specifies:

- EMC requirements;

--experiment method;

- the lowest performance level.

1.2 Normative references

The terms in the following documents become the terms of this standard by reference to this standard. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents are available. . For undated references, the latest edition applies to this standard.

GB1002 single phase plug and socket for home and similar purposes

GB/T4365 electromagnetic compatibility term [idtIEC60050 (161): 1997]

GB/T6113.1 Specification for Radio Interference and Immunity Measurement Equipment (eqvCISPER16-1:1993)

GB/T7260.3 Uninterruptible power supply equipment (UPS) Part 3: Methods and test requirements for determining performance (MODIEC 62040-3: 1999)

Radio disturbance limits and measurement methods for GB9254 information technology equipment (idtCISPR22:1997)

GB17625.1 Harmonic current limit issued by low-voltage electrical and electronic equipment (input current per phase of equipment ≤16A) (idtIEC61000-3-2:1998)

GB17625.2 Electromagnetic compatibility limit for voltage fluctuations and flicker generated by equipment with rated current not exceeding 16A in low-voltage power supply systems (idt IEC61000-3-3:1994)

GB/T17626.1 Electromagnetic compatibility test and measurement technology immunity test (idt IEC61000-4-1: 1992)

GB/T17626.2 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test (idt IEC61000-4-2:1995)

GB/T17626.3 Electromagnetic compatibility test and measurement technology RF electromagnetic field radiation immunity test (idt IEC61000-4-3:1995)

GB/T17626.4 Electromagnetic compatibility test and measurement technology Electrical fast transient burst immunity test (idt IEC61000-4-4:1995)

GB/T17626.5 Electromagnetic compatibility test and measurement technology Surge (impact) immunity test (idt IEC61000-4-5:1995)

GB/T17626.11 Electromagnetic compatibility test and measurement technology Immunity test for voltage dips, short interruptions and voltage changes (idt IEC61000-4-11:1994)

Electromagnetic compatibility (EMC) Part 2: Environment Part 2: Electromagnetic compatibility of

1.3 Definition

In addition to the definitions specified in GB/T4365, this standard supplements the following definitions.

1.3.1 Port

The special interface between the UPS and the external electromagnetic environment is shown in Figure 1.

Figure 1 Port example

1.3.2 enclosure port (enclosure port)

The electromagnetic field can emit and invade the physical interface of the UPS.

2 launch

This chapter deals with disturbances in the frequency range from 0 Hz to 1.0 GHz.

The purpose of determining the launch requirements is to ensure that the harassment generated during normal operation of the UPS does not reach the level that prevents other equipment from operating properly.

Note 1: When the Class B UPS is used, the distance from the receiving antenna is less than 10m. When the Class A UPS is used, the distance from the receiving antenna is less than 30m. The limits specified in this standard cannot provide sufficient protection for radio and television reception.

Note 2: If the UPS is used near high-sensitivity equipment, additional suppression measures may be required to further reduce the electromagnetic emissions to a specified level.

2.1 General requirements

The UPS shall comply with the emission limits specified in 2.41) to 2.5.

The UPS shall be tested under the following conditions:

- rated input voltage;

——operating in normal operation mode and energy storage operation mode;

- Access to a linear load that produces the highest level of disturbance.

2.4 and 2.5 are mainly to determine the EMC limits and measurement methods of the UPS specified in this standard. These limits and methods are based on UPS electromagnetic emissions that may interfere with other equipment (such as radio receivers).

These emission limits are the most basic electromagnetic compatibility requirements.

The test requirements are for each port and the test method is given in Appendix A.

2.2 UPS classification

According to electromagnetic emissions, UPS products should be divided into two categories.

a) UPS that does not limit the sales range

There is no restriction on the scope of sales of UPS, and the use of UPS has nothing to do with the technical capabilities of customers and users. It is called “UPS without limiting sales scope” and implements lower emission limits according to basic EMC protection requirements. This type of product can be divided into Class A UPS and Class B UPS.

1) Class A UPS

UPS used in all facilities that are not home and are not directly connected to the residential low voltage power supply network. (All UPSs that are connected by industrial plugs, sockets, or permanently connected, and UPSs that are fitted with industrial-only plugs and sockets for industrial use are Class A UPSs).

For Class A UPS, the following should be included in the instruction manual:

Warning: This is a Class A UPS product that may cause radio interference in a home environment where additional measures may be required. Class A UPS shall meet the Class A UPS limits of this standard.

Note: Although the limits for Class A UPS are proposed for the industrial and commercial sectors, the management may allow Class A UPS equipment to be in the home and directly connected to the residential low voltage power supply network, after taking any additional measures necessary. Installation and use.

2) Class B UPS

This UPS is suitable for all occasions, including the home, as well as facilities that are directly connected to the residential low-voltage power supply network. [All Class B UPSs must be connected to plugs and sockets in accordance with national standards (GB1002) unless clearly marked for industrial use only or for industrial applications only).

Class B UPS shall meet the limits of Class B UPS of this standard.

b) UPS that limits the scope of sales

“Limited sales coverage” means selling only to customers and users with higher technical capabilities and performing higher emission limits. For economic reasons, manufacturers and users are required to cooperate and negotiate to determine the EMC protection requirements for specific equipment by selecting emission limits or on-site measurements, taking into account all different equipment and boundary conditions.

For UPSs that limit the scope of sales, the following should be included in the instruction manual:

Warning: This is a UPS product that limits the scope of sales. To prevent harassment, there may be installation restrictions and additional measures.

Such limited-range UPSs are limited to rated output currents greater than 25A and are intended to be installed in commercial or industrial buildings with their own power transformers and at least 30m from the boundaries of all other facilities and/or users.

2.3 General measurement conditions

The maximum emission generated by the equipment under test shall be measured within the tested frequency band and in accordance with the normal operating conditions. The UPS operates in the normal mode and the energy storage mode.

The maximum emission is achieved by changing the test configuration of the UPS under test.

For UPSs with additional power terminals (ports) that are independently powered by the stationary bypass circuit and/or the maintenance bypass circuit, these additional power terminals (ports) should be temporarily connected to the normal AC input port whenever possible. Conducted emission tests at 2.4 should include measurements of these additional circuits.

If the UPS is part of the system or can be connected to an auxiliary device, the UPS test only needs to connect the minimum of auxiliary devices necessary to operate these ports, or to terminate the equivalent impedance at the port.

The UPS AC output should be connected to a linear load so that the device under test can operate under any load conditions of its rated output. The test arrangement and operation mode at the time of measurement shall be accurately stated in the test report. The test arrangement and measurement criteria are given in Appendix A, and the field test is shown in Appendix A.8.3.

Tests shall be carried out at their rated input voltage within the specified UPS operating environment, unless otherwise stated.

2.3.1 Buyer, User Documentation

a) If special measures for shielded or special cables are required for compatibility, the buyer, the user, and any restrictions on the length of the AC output cable should be specified.

b) The documents required by the buyer and the user should be sent by letter, and the list of auxiliary devices and the emission requirements of the UPS should be provided together.

2.3.2 Applicability

The relevant ports of the UPS are measured.

2.4 Conducted emissions

2.4.1 Power terminal disturbance voltage limit

The disturbance voltage should not exceed the limits of Table 1 or Table 2, depending on the UPS rating and rated output current.

Table 1 Power terminal disturbance voltage limits for Class A and Class B UPS equipment in the frequency range 0.15 MHz to 30 MHz

Table 2 Power terminal disturbance voltage limits for UPS equipment with a restricted sales range in the frequency range 0.15 MHz to 30 MHz

When using an average detector receiver and a quasi-peak detector receiver, respectively, the UPS should meet both the average and quasi-peak limits and measure according to the method specified in Appendix A.5.

When using a quasi-peak detector receiver measurement, if the average limit is met, the device under test is considered to meet the two limits and no longer need to be measured with the average detector receiver.

If the reading shown on the measurement receiver fluctuates around the limit, the observation time for each measurement frequency reading should be no less than 15 s, the maximum reading is recorded, and any large readings at any isolated instant should be ignored.

a) UPS that does not limit the sales range

b) UPS with limited sales range - suitable for UPS with rated output current greater than 25A

2.4.2 Limit of AC output disturbance voltage

According to the rated output current, the conducted disturbance at the output of the UPS should be less than the limit of Table 1 or Table 2 plus 14dB.

These limits apply only to the case where the cable length of the UPS declared by the manufacturer in its instruction manual may exceed 10 m.

These values ​​should be measured using a voltage probe that complies with A.1.3.

2.4.3 Limits of signal ports

See Appendix C.

2.4.4 DC Port Limits

The UPS has terminals that are connected to an external battery. This port should be included in the test configuration and tested as follows.

The battery of the benchtop UPS and its battery compartment shall be installed in the position permitted by the manufacturer's instructions, and the emission measurement of the DC port shall be part of the radiation emission test.

The external battery and its battery box of the floor-standing UPS should be installed at a distance of 0.8m from the UPS, and wired according to the manufacturer's instructions. The radiation emission test is used to verify the compatibility.

The external battery of the large UPS should be installed at a certain distance from the UPS. The port should be wired according to the manufacturer's instructions. Furthermore, in order to be able to perform measurements in the energy storage mode, a suitable test battery or DC power source is placed on the battery side of the DC cable.

2.4.5 Low Frequency Emission - Input Current Harmonics

If the rated input current is within the range specified in GB17625.1, the current harmonic limit and test method refer to this standard.

2.5 Radiation emission

2.5.1 Electric field

The equipment under test shall meet the limits of Table 3. If the reading shown on the measurement receiver fluctuates around the limit, the reading time for the reading at each measurement frequency should be no less than 15 s. Record the maximum reading and the large reading for any isolated instant should be ignored.

Table 3 Limits of radiated emissions in the frequency range 30 MHz to 1 000 MHz

Table 4 Limits of radiated emissions in the frequency range 30 MHz to 1 000 MHz

Radiation emission limits below 30 MHz are to be determined. a) UPS that does not limit the sales range

2) The content of this article is based on the actual situation of China's products. IEC62040-2-1999 does not specify this.

Apply lower limits at the transition frequency.

Note 1: If the field strength measurement cannot be performed at a distance of 10 m due to the presence of high ambient noise levels or other reasons, it can be measured at a closer distance, see Note 10.2.1 of GB9254.

Note 2: Additional measures are required when interference occurs in the measurement.

b) UPS with limited sales range - suitable for UPS with rated output current greater than 25A

2.5.2 Magnetic field (option)

See Appendix B.

2.5.3 Power limit (to be determined)

See Appendix A.

3 Immunity

The frequency range covered by the immunity requirements is from 0 Hz to 1 GHz.

These test requirements represent basic electromagnetic compatibility immunity requirements. Test requirements are specified for each port considered.

The immunity levels given in this section do not include industrial environments and extreme conditions. Such extreme conditions may exist in any location, but the probability of occurrence is low. For this extreme case, a higher level of immunity may be required.

Note: In special cases, there may be disturbance levels above the level of immunity specified in this standard. For example, using a hand-held transmitter near a UPS may require special mitigation measures.

3.1 General requirements and performance criteria

The minimum requirements for equipment shall comply with the immunity limits of 3.2 to 3.6. Table 5 gives the performance criteria for the UPS.

Table 5 Performance criteria for immunity test

UPS requires testing under the following conditions:

- rated input voltage;

- normal operation mode;

- Linear load at rated output active power.

The UPS should use the appropriate level under different performance criteria.

See Appendix D for the test method.

The attenuation test in Appendix E can be combined with the relevant immunity test when testing the UPS power input terminal.

3.2 Electrostatic discharge immunity

The UPS should be able to withstand the electrostatic discharge test specified in GB/T17626.2 when it is in operation.

- minimum requirement level 3;

- Performance criterion B.

3.3 Radio Frequency Electromagnetic Field Radiation Immunity

The UPS should be able to withstand the RF electromagnetic field radiation immunity test specified in GB/T17626.3.

- minimum requirement level 2;

- Performance criterion A.

3.4 Electrical fast transient burst immunity

The UPS shall be capable of withstanding the common mode (electrical fast transient) conducted immunity test level specified in GB/T17626.4.

- minimum requirement level 2;

- Performance criterion A.

It shall be tested on all power cables and battery connection cables (when the length exceeds 3 m), and the test of the input/output signals and control cables shall be one-half of the above.

Regardless of the UPS power, the test uses the coupling clamp described in 6.3 of GB/T17626.4. The minimum duration of the test was 1 min.

3.5 Surge (impact) immunity 2)

The UPS should be able to withstand the surge (impact) immunity test specified in GB/T17626.5.

- minimum requirement level 3;

- Performance criterion B.

3.6 Low frequency signal immunity

The UPS shall be capable of withstanding the electromagnetic compatibility of low frequency conducted disturbances and grid transmission signals as specified in IEC61000-2-2, as detailed in Appendix D (see D.6).

Compatibility Tested by simulating the above conditions, the UPS should be operated continuously, and the specified performance is not reduced. (To be continued)

1) IEC62040-2: 1999 is incorrectly 2.3

2) The content of this article is based on the actual situation of China's products. IEC62040-2-1999 does not specify this.

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