GB 19212.20-2008Safety of power transformers, power supply units and similar -- Part 20: Particular requirements for perturbation attenuation transformers (English PDF)

Foreword

All technical content in this Part of GB 19212 is mandatory.

GB 19212 "of power transformers, power supply units and similar products" currently proposed is divided into 24 parts.

Part 1. General requirements and tests Part 2. Particular requirements for separating transformers for general use Part 3. Particular requirements for control transformers Part 4. Gas and oil burner ignition transformers for special requirements Particular requirements for isolating transformers for general purposes. Part 5 Part 6. Particular requirements for shaver transformers and shaver supply units Part 7. Particular requirements for safety isolating transformers for general purposes Part 8. Particular requirements for transformers for toys Particular requirements for bell and bell transformers. Part 9 Part 10. Particular requirements for class III portable transformers for filament lamps Part 11. Particular requirements for the operating voltage 1000V above high insulation level transformers Particular requirements for the leakage magnetic transformers. Part 12 Particular requirements for constant voltage transformers. Part 13 Part 14. General Purpose Particular requirements for auto-transformers Part 15. Particular requirements for regulator Part 16. Particular requirements for supply of medical locations isolation transformer Part 17. Particular requirements for power supply units and similar products Part 18. Particular requirements for transformers for switch mode power supplies Part 19. Particular requirements for medical devices for transformers Part 20. Particular requirements for transformers interference attenuation Particular requirements for small reactors. Part 21 Particular requirements for having a special media (liquid medium SF6) transformer. Part 22 Part 23. Electrical transformers have the highest rated temperature of the specific requirements Particular requirements for transformers for construction sites. Part 24 this is Part 20 GB 19212's.

The partial modification using IEC 61558-2-19:2000 (first edition), "Safety of power transformers, power supply units and similar products Part 2-19. Particular requirements for transformers disturbance attenuation "(in English).

This section according to IEC 61558-2-19:2000 redrafted. This part of IEC 61558-2-19:2000 In addition to this technical difference the modified content section, but entirely due to GB 19212.1-2003 "power transformers, power supply units referenced in this section and similar production Product Safety - Part 1. General requirements and tests "(IEC 61558-1:1998, MOD) and IEC 61558-1:1998 Existing technical Differences arising, see GB 19212.1-2003 the foreword. Taking into account China's national conditions, in using IEC 61558-2-19:2000, the present Part made some changes. About the technical differences have been incorporated into the text, and they are involved in terms of the margin of a single vertical line Identity.

For ease of use, this part of IEC 61558-2-19:2000 also made the following editorial changes.

a) "this International Standard" be replaced by "this section";

b) use a decimal point instead of a decimal comma ",". ",";

c) Remove IEC 61558-2-19:2000 Foreword.

Taking into account the actual situation in China, this part of IEC 61558-2-19:2000 in the power supply voltage and rated voltage tolerance aspects it has been modified. IEC standards +6% - 10%, and this part of the country according to national standards, to + 7% - 10%. this Part of IEC 61558-2-19:2000 preferred value in the interference attenuation transformer AC rated output voltage complements increased domestic Common 220V, 380V AC and 36V rated output voltage.

This section is based on GB 19212.1-2003 on the development, it needs to be used in conjunction with GB 19212.1-2003.

This part is the GB 19212.1-2003 corresponding chapter, article supplement and modified so GB of content 19212.1-2003 Conversion-oriented part of the contents. The newly added section for GB 19212.1-2003 Terms numbered starting from 101.

This part is proposed by the China Electrical Equipment Industrial Association.

This part of the National Standardization Technical Committee transformers (SAC/TC44) centralized.

This part by the China Electronics Standardization Institute, Shenyang Transformer Research Institute drafted.

1 Scope

The chapter GB 19212.1-2003 by the following instead.

This section provides various aspects of the transformer (eg, electrical, thermal and mechanical aspects) safety requirements.

This section applies to Stationary or mobile, single-phase or multi-phase, air-cooled (natural cooling or forced cooling), alone or supporting the use of isolation or safety isolating transformer, its rated supply voltage not exceeding AC 1000V, rated frequency not exceeding 500Hz, rated output not exceeding 10kVA. Disturbance attenuation transformer intended to be used as office equipment or similar equipment power supply, the output circuit having a midpoint output to it attenuate conducted interference MAINS.

In addition, the installation procedures and equipment specifications double insulation or reinforced insulation between circuits should be implemented through the use of such a transformer.

Note 1. The use of such a transformer connected to the device specified in this does not mean that you can reduce the requirements for the device.

Disturbance attenuation isolating transformer.

--- No-load output voltage and rated output voltage exceeding 50V AC or ripple-free DC 120V, but not more than AC 500V or Ripple-free DC 708V; To comply with national wiring regulations or requirements for a particular purpose, no-load output voltage or the rated output voltage these limits may be exceeded, but not exceed 1000V AC or ripple-free DC 1415V.

Disturbance attenuation safety isolating transformer.

--- No-load output voltage or the rated output voltage does not exceed 50V AC or ripple-free DC 120V.

This section applies to dry-type transformers. Windings can be sealed or non-sealed.

If the isolation transformer to two or more devices to provide power, so some of the devices connected to the exposed conductive parts Need to comply with the provisions of 413.5 of IEC 60364-4-41.

Note 2. The media is filled with a liquid or powder material (such as sand) of the transformer, the additional requirements are under consideration.

Note 3. to note the following.

--- For transformer intended to use in a tropical climate countries, special requirements may be necessary;

--- Located in areas of special environmental conditions may require specific requirements.

Note 4. This section does not prevent the use of the output circuit midpoint no other types of transformers as attenuation transformers.

This section does not include the performance of "decay" feature. This function can be different characteristics, e.g., to block or special laminate obtain.

This section also applies to transformers incorporating electronic circuits. This part is not intended to be used with the transformer input and output terminals or output A receptacle connector and an external circuit components.

2 Normative references

GB 19212.1-2003 this chapter apply.

3 Terms and Definitions

In addition to the following entries, GB 19212.1-2003 this chapter apply.

The chapter increased the following entries.

3.101

The secondary winding has a center point for conducted interference attenuation power transformer, scheduled for limiting devices of the transformer is electrically connected Transient appears on the source of.

4 General requirements

GB 19212.1-2003 this chapter apply.

5 General Description, tests

GB 19212.1-2003 this chapter apply.

6 RATINGS

In addition to the following terms outside, GB 19212.1-2003 this chapter apply.

The chapter increased the following provisions.

6.101 rated output voltage shall not exceed.

--- Interference attenuation isolating transformer, AC or 500V ripple-free DC 708V;

--- Interference attenuation safety isolating transformer, AC 50V and (or) ripple-free DC 120V.

AC rated output voltage is preferably.

--- Interference attenuation isolating transformer, 72V, 120V, 220V, 230V, 380V, 400V and 440V;

--- Interference attenuation safety isolating transformer, 6V, 12V, 24V, 36V, 42V and 48V.

6.102 rated output not exceeding 10kVA.

Preferably of rated output.

--- 10VA, 16VA, 25VA, 40VA, 63VA, 100VA, 160VA, 250VA, 400VA, 630VA, 1000VA, 1600VA, 2500VA, 4000VA, 6300VA and 10000VA.

6.103 rated frequency shall not exceed 500Hz.

6.104 rated supply voltage not exceeding AC 1000V.

Flag by visual inspection to verify compliance with the requirements of 6.101 to 6.104.

Category 7

In addition to the following terms outside, GB 19212.1-2003 this chapter apply.

Article 7.2 the following modifications.

Press the short circuit protection or protection of normal use classification.

--- Inherent short-circuit proof transformers;

--- Non-inherent short-circuit proof transformers;

--- Safe transformers.

8 Marking and other information

In addition to the following terms outside, GB 19212.1-2003 this chapter apply.

Article 8.1 the following modifications.

h) interference attenuation transformer should be marked with one of the graphic symbols shown in 8.11.

8.3 GB 19212.1-2003 that section does not apply.

8.4 GB 19212.1-2003 that section does not apply.

8.11 Addition of the following.

Symbol Description Symbol IEC 60417a number no harm isolation transformer interference attenuation Short-circuit proof isolating transformer interference attenuation (intrinsic resistance Inherent short-circuit or short-circuit proof) Non-hazardous safety isolation transformer interference attenuation Short-circuit proof safety isolating transformer interference attenuation (solid There are short-circuit proof non-inherently short-circuit proof) aIEC 60417 (all parts).1998.

The chapter increased the following provisions.

8.101 All transformers shall be accompanied by the specification, illustrate the use of a transformer, and warned people not to use the following connections.

--- Connection midpoint and fixtures protective grounding;

--- Transformer secondary connection to the fixed wiring.

9 Contact with hazardous live parts Protection

GB 19212.1-2003 this chapter apply.

10 Change the input voltage setpoint

In addition to the following terms outside, GB 19212.1-2003 this chapter apply.

Transformer has not allowed more than one rated supply voltage.

Do not allow the transformer is equipped for regulating the input connector (for example, taps) to accommodate various supply voltage regulating device.

11 Load output voltage and output current

In addition to the following terms outside, GB 19212.1-2003 this chapter apply.

11.1 before that section is replaced by the following two paragraphs.

When connected to the transformer rated frequency rated supply voltage, secondary connected cosphi = 1, enables the secondary rated output load, input Rated voltage and the difference shall not exceed 3%.

12 No-load output voltage

In addition to the following terms outside, GB 19212.1-2003 this chapter apply.

The chapter increased the following provisions.

12.101 In any case, no-load output voltage shall not exceed the following values, even in a predetermined without the separate windings are connected in series when connected in series should be so.

--- Interference attenuation isolating transformer, AC or 500V ripple-free DC 708V;

--- Interference attenuation safety isolating transformer, 50V AC or ripple-free DC 120V.

12.102 no-load output voltage and load output voltage difference can not be too large.

When the transformer is connected to the rated frequency at ambient temperature rated supply voltage, by measuring the load output voltage to verify compliance 12.101 and 12.102 requirements.

Under this measured load output voltage during the test in Chapter 11 of the measured load output voltage difference, the latter percentage voltage Represented, should not exceed 6%.

NOTE. This ratio is defined as follows.

U -U load load

U × 100% load

13 Short-circuit voltage

GB 19212.1-2003 this chapter apply.

Fever 14

GB 19212.1-2003 this chapter apply.

15 Short-circuit and overload protection

GB 19212.1-2003 this chapter apply.

16 Mechanical strength

GB 19212.1-2003 this chapter apply.

17 Dust, solid objects and moisture into the harmful Protection

GB 19212.1-2003 this chapter apply.

18 Insulation resistance and dielectric strength

GB 19212.1-2003 this chapter apply.

19 Structure

In addition to the following terms outside, GB 19212.1-2003 this chapter apply.

Which is replaced by the following.

19.1 input and output circuits shall be electrically isolated from each other, but also in the structure should ensure that there can be any one of these circuits it connected directly or indirectly through other metal parts.

By visual inspection and measurement, and to consider the provisions of chapter 18 and 26 to verify eligibility.

19.1.1 input and output winding insulation between the windings by double or reinforced insulation components.

Also comply with the following requirements.

--- Class I transformer, insulation between the input winding and the case should be determined by the composition of the basic insulation, between the output windings and the housing it should consist of double or reinforced insulation;

--- Of class II transformer insulation between the input winding and the housing and between the output windings and the body should be determined by double or plus Strong insulation components.

19.1.2 intermediate metal parts (such as the core) is not connected with the housing and is located in the input and output transformer windings, where goldsmith Between the case of components and input winding, insulation or metal parts and intermediate output windings shall be composed of at least basic insulation.

Note. Do not input or output windings, or the housing by at least basic insulation to isolate the intermediate metal parts is considered to be connected with the related parts.

Also comply with the following requirements.

--- Class I transformer between the input and output windings via the intermediate metal parts should be insulated by a double or reinforced insulation composition;

--- Of class II transformer between the input and output windings by double or reinforced insulation composed by insulating intermediate metal parts; input Between the windings and the housing, and the housing and between the output windings by double or reinforced insulation by insulating intermediate metal parts.

Edge components.

19.1.3 I class transformer between the input and output windings shall not have a protective shield.

19.1.4 transformer can not be equipped with electrical input and output capacitor connected to the circuit.

The chapter increased the following provisions.

There can not be a connection between the output circuit and 19.101 protectorate.

There can not be connected to the output circuit between 19.102 and housing.

By visual inspection to verify their eligibility.

Position input and output terminals connected to external conductors 19.103 shall guarantee the access of these measurements between the wire terminal access point when the distance between the input and output terminals is not less than 25mm. If the distance is to rely on to achieve the separator, the separator must be used Edge material, and it should be permanently attached to the transformer.

By visual inspection and, in the case of ignoring the intermediate metal parts is checked by measuring eligibility.

19.104 to 19.110 blank.

19.111 pairs isolation transformer, the output socket, if any, should be part of the transformer. For matching transformers, connections with the device to ensure having double insulated cable or cord.

19.112 output winding should have the outlet (if any) the midpoint of the ground terminal connection terminals. For having more than one output Windings, each output winding should use double or reinforced insulation to isolate. In addition, the midpoint tap of the windings can be connected together Received with all output jack on a common terminal (if any) connected to the ground terminal. Ground terminal output circuit outlet must not be with Paul Protective earth terminal is connected.

By visual inspection, by the tests and 18.1 according to the provisions of Chapter 26 Compliance is checked by measurement.

Note. disturbance attenuation transformers can have both a metal material and a shell of insulating material.

19.113 transformer should be fitted with circuit protection device shown in FIG. 101, in order to be connected to the device, connected to the phase line and the midpoint Between conductors or between two phase conductors can disconnect the output circuit shorted. In this case, circuit protection devices should be in the table 101 within specified time action.

Note. This table is taken from IEC 60364-4-41 Table 41A.

By visual inspection and the following tests to verify eligibility.

The input of the transformer is connected to equal 0.94 times to 1.07 times the rated voltage (whichever is more severe voltage), each input Once the terminal is connected to a midpoint, then the output terminals are connected to the test circuit protection devices. Circuit protection device should be in the table 101 within the predetermined operation time.

19.114 functional reasons, when using a shield between the input and output winding is connected to ground, the shield layer and between the output windings INSULATION shall consist of double or reinforced insulation.

101 output short circuit protection when

Table 101 maximum break time

U0a /

Longest interruption time /> 400 0.8 0.4 0.4 0.2 0.1 aU0 exchange for a nominal rms voltage.

20 Component

In addition to the following terms outside, GB 19212.1-2003 this chapter apply.

The chapter following modifications.

20.3 pairs of input and output voltage ratio of 1, and a predetermined voltage to be used in zone II transformer, whose output circuit Plug socket should be able to accept it intended to be directly related to the national power grid connected to.

The chapter increased the following provisions.

Circuit protection devices 20.101 in intended to be permanently connected to fixed wiring interference attenuation on the transformer, the operator shall comply 19.113 Co GB 13539.5 fuse or circuit breaker small components. In mobile disturbance attenuation transformers, circuit protection device may be made GB 9364 in line with the rated current is less than or equal to 6.3A fuse components.

By visual inspection to verify compliance.

21 Internal wiring

GB 19212.1-2003 this chapter apply.

22 Supply connection and other external flexible cable or cord

Except for the following, GB 19212.1-2003 this chapter apply.

Only output less than or equal 250VA only allows the use of Z-connected.

23 Terminals for external conductors

GB 19212.1-2003 this chapter apply.

24 Protection grounding device

GB 19212.1-2003 this chapter apply.

25 Screws and connections

GB 19212.1-2003 this chapter apply.

26 Creepage distances, clearances and distances through insulation

GB 19212.1-2003 this chapter apply.

27 Resistance to heat, abnormal heat, to fire and to tracking

GB 19212.1-2003 this chapter apply.

28 Rust

GB 19212.1-2003 this chapter apply.

Book GB 19212.20-2008 appendix Appendix GB 19212.1-2003 apply.

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