GB 17625.2-2007[GB/T 17625.2-2007] Electromagnetic compatibility (EMC) -- Limits -- Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current <=16 A per phase and not subject to conditional conn (English PDF)

Foreword

All the technical contents of this Part are mandatory.

This Part is identical to IEC 61000-3-3.2005.

IEC 61000 is published in separate parts according to the following structure.

Part 1.General

General considerations (introduction, fundamental principles)

Definitions, terminology

Part 2.Environment

Description of the environment

Classification of the environment

Compatibility levels

Part 3.Limits

Emission limits

Immunity limits (in so far as they do not fall under the responsibility of

product committees)

Part 4.Testing and measurement techniques

Measurement techniques

Testing techniques

Part 5.Installation and mitigation guidelines

Installation guidelines

Mitigation methods and devices

Part 9.Miscellaneous

Each part is further subdivided into sections which are to be published either

as International Standards or as Technical Reports.

These standards and reports will be published in chronological order and

numbered accordingly.

This Part is identical to IEC 61000-3-3.2005 "Electromagnetic compatibility

(EMC) - Part 3-3.Limits - Limitation of voltage changes, voltage fluctuations

and flicker in public low-voltage supply systems, for equipment with rated

current <=16 A per phase and not subject to conditional connection". This Part is

a Product Family Standard.

The limits in this Part relate to the voltage changes experienced by consumers

connected at the interface between the public supply low-voltage network and

the equipment user's installation. Consequently, if the actual impedance of the

supply at the supply terminals of equipment connected within the equipment

user's installation exceeds the test impedance, it is possible that supply

disturbance exceeding the limits may occur.

"Electromagnetic compatibility (EMC) - Limits" consists of the following parts

- GB 17625.1-2003 Electromagnetic compatibility - Limits - Limits for

harmonic current emissions (equipment input current <= 16 A per phase)

- GB 17625.2-2007 Electromagnetic compatibility limits (EMC) - Limitation of

voltage changes, voltage fluctuations and flicker in public low-voltage

supply systems, for equipment with rated current <=16 A per phase and not

subject to conditional connection

- GB 17625.3-2000 Electromagnetic compatibility - Limits - Limitation of

voltage fluctuations and flicker in low-voltage power supply systems for

equipment with rated current greater than 16 A

This Part is Part 2 of "Electromagnetic compatibility (EMC) - Limits".

This Part replaces GB 17625.2-1999 "Electromagnetic compatibility limits -

Limitation of voltage fluctuations and flicker in low-voltage supply systems for

equipment with rated current <= 16 A" from the date of implementation.

Compared with GB 17625.2-1999, the main modifications are as follows.

- MODIFY the standard name, to be consistent with the standard name of

IEC 61000-3-3;

- In clause 1 "Scope", MODIFY "This Part is applicable to electrical and

electronic equipment having an input current not greater than 16 A per

phase, intended to be connected to public low-voltage distribution systems

of between 220 V and 250 V line to neutral at 50 Hz." TO "This Part is

applicable to electrical and electronic equipment having an input current

equal to or less than 16 A per phase, intended to be connected to public

low-voltage distribution systems of between 220 V and 250 V line to neutral

at 50 Hz, and not subject to conditional connection."

ADD "Equipment which does not comply with the limits of this Part when

tested with the reference impedance Zref of 6.4, and which therefore cannot

be declared compliant with this part, may be retested or evaluated to show

conformity with IEC 61000-3-11.IEC 61000-3-11 is applicable to equipment

with rated input current <= 75 A per phase and subject to conditional

connection".

DELETE "For special equipment not widely used and designed and those

does not meet the requirements (limits) of this Part, the consent of the

power supply department shall be obtained before being connected to

distribution systems. Guidance for the evaluation of such equipment is

given in the Technical Report IEC 61000-3-5.1994." in the note.

- In clause 2 "Normative references", ADD GB 15579-1995 "Arc welding

equipment - Part 1.Welding power sources"; GB 17625.1-2003

"Electromagnetic compatibility - Limits - Limits for harmonic current

emissions (equipment input current <= 16 A per phase)"; IEC 61000-3-11

Electromagnetic compatibility (EMC) - Part 3-11.Limits - Limitation of

voltage changes, voltage fluctuations and flicker in public low-voltage

supply systems - Equipment with rated current <= 75 A and subject to

conditional connection.

Because Amendment 1 (1990) to IEC 60868.1986 "Flickermeter -

Functional and Design Specifications" is replaced by IEC 61000-4-15.2003,

the original reference is replaced by IEC 61000-4-15.2003.

- In clause 3 "Definitions", ADD terms. r.m.s. voltage shape U(t), voltage

change characteristic deltaU(t), maximum voltage change characteristic deltaUmax,

voltage fluctuation, flicker impression time tf, conditional connection,

interface point.

- MODIFY the heading of clause 4 TO "Assessment of voltage changes,

voltage fluctuations and flicker", by adding "voltage fluctuations" in the

original heading.

- In clause 5 "Limits", MAKE the following modifications.

"the relative steady-state voltage change, dc, shall not exceed 3 %" is

modified to. the relative steady-state voltage change shall not exceed 3.3 %;

"the value of d(t) during a voltage change shall not exceed 3 % for more

than 200 ms" is modified to. the value of d(t) during a voltage change shall

not exceed 3.3 % for more than 500 ms; "the maximum relative voltage

change dmax, shall not exceed 4 %" is modified to. the maximum relative

voltage change dmax, shall not exceed 4 %, 6 %, 7 %, and specify the

applicable conditions of different limits of dmax.

- In clause 6 "General", ADD the following contents.

"Tests need not be made on equipment which is unlikely to produce

significant voltage fluctuations or flicker.

It may be necessary to determine, by examination of the circuit diagram

and specification of the equipment and by a short functional test, whether

significant voltage fluctuations are likely to be produced.

For voltage changes caused by manual switching, equipment is deemed to

comply without further testing if the maximum r.m.s. input current (including

inrush current) evaluated over each 10 ms half-period between zero-

crossings does not exceed 20 A, and the supply current after inrush is within

a variation band of 1.5 A.

If measurement methods are used, the maximum relative voltage change

dmax caused by manual switching shall be measured in accordance with

Annex B."

- MODIFY the diagrams of Figure 2 -- Histogram evaluation of U(t) and

Figure 3 -- Relative voltage change characteristic.

- In Annex A "Application of limits and type test conditions for specific

equipment", ADD

test conditions for lighting and similar equipment, test conditions for

washing machines, test conditions for audio-frequency amplifiers, test

conditions for air conditioners, dehumidifiers, heat pumps, and commercial

refrigerating equipment, test conditions for arc welding equipment and

allied processes.

- ADD Annex B "Test conditions and procedures for measuring dmax voltage

changes caused by manual switching".

Annex A and Annex B of this Part are normative annexes.

This Part was proposed by China Electrical Equipment Industry Association.

This Part is under the jurisdiction of National Technical Committee on

Electromagnetic Compatibility of Standardization Administration of China

(SAC/TC 246).

Responsible drafting organization of this Part. Shanghai Electric Tools

Research Institute.

Participating drafting organization of this Part. Shanghai Lighting Research

Institute.

Main drafters of this section are. Yin Haixia, Li Bangxie, Gu Jing, Chen Jianqiu,

Pan Shunfang, Wang Yongxi.

This Part shall be interpreted by Shanghai Electric Tools Research Institute.

The previous released version replaced by this Part is as follows. GB 17625.2-

1999.

Electromagnetic compatibility (EMC) - Limits - Limitation of

voltage changes, voltage fluctuations and flicker in public

low-voltage supply systems, for equipment with rated current

<= 16 A per phase and not subject to conditional connection

1 Scope

This Part is concerned with the limitation of voltage fluctuations and flicker

impressed on the public low-voltage system.

2 Normative references

The following documents contain the provisions which, through reference in this

Part, become the provisions of this Part. For dated references, their subsequent

amendments (excluding corrigendum) or revisions do not apply to this Part.

3 Terms and definitions

For the purpose of this Part, the following terms and definitions and those

defined in GB/T 4365-2003 apply.

4 Assessment of voltage changes, voltage fluctuationsn and flicker

The short-term flicker value Pst is defined in IEC 60000-4-15.2003.

All types of voltage fluctuations may be assessed by direct measurement using

a flickermeter which complies with the specification given in IEC 60000-4-

15.2003, and is connected as described in clause 6 of this Part. This is the

reference method for application of the limits.

5 Limits

The limits shall be applicable to voltage fluctuations and flicker at the supply

terminals of the equipment under test, measured or calculated according to

clause 4 under test conditions described in clause 6 and Annex A. Tests made

to prove compliance with the limits are considered to be type tests.

6 Test conditions

If measurement methods are used, the maximum relative voltage change dmax

caused by manual switching shall be measured in accordance with Annex B.

The magnitude of the current shall be measured with an accuracy of ±1 % or

better. If instead of active and reactive current the phase angle is used, its error

shall not exceed ±2°.

Annex A

(normative)

Application of limits and type test conditions for specific equipment

For cookers designed for use in domestic premises, the evaluation of Plt shall

not be required.

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