Detail of GB/T 22794-2017

Introduction of GB/T 22794-2017

This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 22794-2008 Type B residual current operated circuit-breakers with and without integral overcurrent protection for household and similar uses (Type B RCCBs and Type B RCBOs). The following main technical changes have been made with respect to GB/T 22794-2008. ——the foreword is modified; ——the scope is modified to cover Type F RCDs; ——the definition of Type B residual current device is added in 3.2; ——the classification according to behaviour in presence of d.c. components is added in 4.1; ——the characteristics of Type F residual current device in 5.1 are added; ——the characteristics of Type B residual current device are added in 5.2; ——the marking for Type F RCDs is added in 6.1; ——the marking for Type B RCDs is modified in 6.2; ——the conditions for Type F and Type B RCDs are added in 8.1; ——the behaviour of three- and four- pole Type B RCDs powered on two poles only is added in 8.2.1.7; ——the behaviour of RCDs in the case of surge residual currents is add in 8.3.1; Behaviour of RCDs in the case of inrush residual currents is add in 8.3.2; Behaviour in case of residual pulsating direct currents in presence of a standing smooth direct current of 10 mA is added in 8.3.3; ——the tests for Type F and Type B RCDs are added in 9.1; ——the verification of the correct operation for three- and four-pole Type B RCDs powered on two poles only are added in 9.2.3; ——“Figure 1 Example of a test circuit for the verification of correct operation in case of residual sinusoidal alternating currents composed of multi-frequency components resulting from single-phase supplied speed motor control equipment” is added; ——“Figure 2 Test circuit for the verification of the behaviour of the RCD in case of inrush residual currents” is added; ——Annex A “Number of samples to be submitted and test sequences to be applied for verification of conformity for type F RCCBs” and Annex B “Number of samples to be submitted and test sequences to be applied for verification of conformity for Type F RCBOs”; ——Annex C “Number of samples to be submitted and test sequences to be applied for verification of conformity for Type B RCCBs” is modified; ——Annex C “Routine tests for Type F and Type B RCDs” is modified; This standard, by translation, is identical to IEC 62423:2009 Type F and type B residual current operated circuit-breakers with and without integral overcurrent protection for household and similar uses. The Chinese documents identical to the normative international documents given in this standard are as follows: ——GB/T 13870.1-2008 Effects of current on human beings and livestock - Part 1: General aspects (IEC/TS 60479-1:2005, IDT) ——GB/T 13870.2-2016 Effects of current on human beings and livestock - Part 2:Special aspects (IEC/TS 60479-2: 2007, IDT) ——GB/T 16916.1-2014 Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCB) - Part 1: General rules (IEC 61008-1: 2012, MOD); ——GB/T 16917.1-2014 Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1:General rules (IEC 61009-1: 2012, MOD) This standard was proposed by the China Electrical Equipment Industrial Association This standard is under the jurisdiction of SAC/TC 189 National Technical Committee on Low-voltage Apparatus of Standardization Administration of China. The previous editions of this standard are as follows: ——GB 22794-2008, GB/T 22794-2008. Introduction RCCBs and RCBOs designed according to IEC 61008-1 and IEC 61009-1 are suitable in most of the applications. IEC 61008-1 and 61009-1 provide appropriate requirements and tests for general use in household and similar uses. However, the use of new electronic technology in equipment may result in particular residual currents not covered in IEC 61008-1 or IEC 61009-1. This standard covers specific applications where additional requirements and testing are needed. This standard includes definitions, additional requirements and tests for Type F and Type BRCCBs and/or RCBOs to cover particular situations. The tests shall first be applied according to IEC 61008-1 for Type F or Type B RCCBs and according to IEC 61009-1 for Type F or Type B RCBOs. After completion of the tests given either in IEC 61008-1 or IEC 61009-1 the additional tests given in this standard shall be applied for RCCBs and RCBOs in order to show conformity to this standard (see Annex A, Annex B for Type F or Annex C, Annex D for Type B respectively). The number of samples to be submitted and test sequences to be applied for verification of conformity for Type F RCCBs and Type F RCBOs are given in Annex A or Annex B. The number of samples to be submitted and test sequences to be applied for verification of conformity for Type B RCCBs and Type B RCBOs are given in Annex C or Annex D. This standard introduces Type F RCDs (F for Frequency) with rated frequency 50 Hz or 60 Hz intended for protection of circuits with frequency inverters supplied between phase and neutral or phase and earthed middle conductor taking into account the necessary features for these particular situations in addition to the cases covered by type A RCDs. In case of a frequency inverter, e.g. used for motor speed control, supplied between phase and neutral, a composite residual current including the power frequency, the motor frequency and the chopper clock frequency of the frequency inverter may occur in addition to alternating or pulsating d.c. residual currents. Type F RCDs cannot be used where electronic equipment with double bridge rectifiers supplied from two phases is found or if a smooth d.c. residual current can occur. This standard introduces Type B RCDs to be used in case of residual pulsating rectified direct current which results from one or more phases, and smooth d.c. residual current in addition to the cases covered by Type F RCDs. For these applications, two, three or four pole Type B RCDs can be used. Type F and type B residual current operated circuit-breakers with and without integral overcurrent protection for household and similar uses 1 Scope The scope of IEC 61008-1 and IEC 61009-1 applies with the following additions. This standard specifies requirements and tests for Type F and Type B RCDs (Residual Current Devices). Requirements and tests given in this standard are in addition to the requirements of Type A residual current devices. This standard can only be used together with IEC 61008-1 and IEC 61009-1. Type F RCCBs (Residual Current Circuit Breaker) and Type F RCBOs (Residual Current Circuit Breaker with Overcurrent Protection) with rated frequency 50 Hz or 60 Hz are intended for installations when frequency inverters are supplied between phase and neutral or phase and earthed middle conductor and are able to provide protection in case of alternating residual sinusoidal at the rated frequency, pulsating direct residual currents and composite residual currents that may occur. Type B RCCBs and Type B RCBOs are able to provide protection in case of alternating residual sinusoidal currents up to 1000 Hz, pulsating direct residual currents, composite residual currents and smooth direct residual currents. RCDs according to this standard are not intended to be used in d.c. supply systems. Further requirements and tests for products to be used in situations where the residual current was not intended to be covered in IEC 61008-1 or IEC 61009-1 are under consideration. For the purpose of manufacturer’s declaration or verification of conformity, type tests should be carried out in test sequences in compliance with Annex A, Annex B, Annex C or Annex D of this standard. The complete test sequence for type test of Type F RCCBs and Type F RCBOs is given in Tables A.1 and B.1 respectively. The complete test sequence for type test of Type B RCCBs and Type B RCBOs is given in Tables C.1 or D.1 respectively. Note 1: Throughout the document, the term RCD refers to RCCBs and RCBOs. Note 2: Requirements for 1 pole with solid neutral are under consideration. Note 3: Even if the surge voltage will cause flashover and subsequent current, and the inrush residual current with the maximum duration of 10 ms will be generated when the electronic equipment or EMC filter is turned on, the F-type and B-type RCDs still have high resistance to unwanted tripping. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC/TS 60479-1 Effects of current on human beings and livestock - Part 1: General aspects IEC/TS 60479-2 Effects of current on human beings and livestock - Part 2: Special aspects IEC 61008-1: 1996 Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCBs) - Part 1: General rules Amendment 1: 2002 Amendment 2: 2006 IEC 61009-1: 1996 Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules Amendment 1: 2002 Amendment 2: 2006 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 smooth direct current a direct current which is ripple free Note: When the ripple coefficient is less than 10%, it can be considered that the current has no ripple. ) 3.2 type F residual current device residual current device for which tripping is ensured as for Type A according to IEC 61008-1 or IEC 61009-1 and in addition: ——for composite residual currents, whether suddenly applied or slowly rising intended for circuit supplied between phase and neutral or phase and earthed middle conductor ——for residual pulsating direct currents superimposed on smooth direct current Note: composite residual current is the residual current composed of more than one obvious sine wave frequency. 3.3 type B residual current device residual current device for which tripping is ensured as for Type F according to this standard and in addition: ——for residual sinusoidal alternating currents up to 1000 Hz, ——for residual alternating currents superimposed on a smooth direct current ——for residual pulsating direct currents superimposed on a smooth direct current ——for residual pulsating rectified direct current which results from two or more phases ——for residual smooth direct currents whether suddenly applied or slowly increased independent of polarity 4 Classification According to IEC 61008-1 or IEC 61009-1, as applicable with the following addition: 4.1 According to behaviour in presence of d.c. components ——Type F RCDs ——Type B RCDs 5 Characteristics 5.1 Type F residual current device Residual current device for which tripping is ensured as for Type A according to IEC 61008-1 or IEC 61009-1, as applicable, and in addition, ——for composite residual currents, whether suddenly applied or slowly rising intended for circuit supplied between phase and neutral or phase and earthed middle conductor (see 8.1); ——and for residual pulsating direct currents superimposed on smooth direct current of 10mA (see 8.3.3). The above specified residual currents may be suddenly applied or slowly rising. 5.2 Type B residual current device 5.2.1 General Residual current device for which tripping is ensured as for Type F and in addition ——for residual sinusoidal alternating currents up to 1000 Hz (see 8.2.1.1), ——for residual alternating currents superimposed on a smooth direct current of 0.4 times the rated residual current (IΔn) or 10 mA, whichever is the highest value (see 8.2.1.2), ——for residual pulsating direct currents superimposed on a smooth direct current of 0.4 times the rated residual current (IΔn) or 10mA, whichever is the highest value (see 8.2.1.3), ——for residual direct currents which may result from rectifying circuits, i.e., ——two-pulse bridge connection line to line for 2-, 3- and 4-pole devices (see 8.2.1.4), ——three-pulse star connection or six-pulse bridge connection for 3- and 4-pole devices (see 8.2.1.5), ——for residual smooth direct currents (see 8.2.1.6). The above specified residual currents may be suddenly applied or slowly increased independent of polarity. 5.2.2 Standard values of break time and non-actuating time for residual direct currents which result from rectifying circuits and for residual smooth direct current See Table 1 for Type B RCDs – standard values of break time and non-actuating time for residual direct currents which result from rectifying circuits and for residual smooth direct current Table 1 Type B RCDs – Standard values of break time and non-actuating time for residual direct currents which result from rectifying circuits and for residual smooth direct current Type In A I△n A Standard values of break time and non-actuating time at a residual ) current (IΔ) equal to s 2I△n 4I△n 10I△n 5A, 10A, 20A, 50A, 100A, 200Aa General Any value Any value 0.3 0.15 0.04 0.04 Maximum break times S ≥25 >0.030 0.5 0.2 0.15 0.15 Maximum break times 0.13 0.06 0.05 0.04 Minimum non-actuating times For Type B RCBOs any value exceeding the lower limit of the overcurrent instantaneous tripping range are not tested. a The tests are only made during the verification of the correct operation as mentioned in 9.2.1.5 b) according to Figure 6a), and 9.2.1 .6 b) according to Figure 6b). 5.2.3 Values of tripping current according to frequencies which differ from the rated frequency 50/60 Hz See Table 2 for Type B RCDs – residual non-operating and operating current according to frequencies which differ from the rated frequency 50/60 Hz Table 2 Type B RCDs – Residual non-operating and operating current according to frequencies which differ from the rated frequency 50/60 Hz Frequency Hz Residual non-operating current Residual operating current 150 0.5I△n 2.4I△na 400 0.5I△n 6I△na 1000 I△n 14I△na, b Note 1: The definitions of “residual non-operating current and of “operating currents” are those of IEC 61 008-1 and IEC 61 009-1 Note 2: The waveform for the given frequencies is sinusoidal. Note 3: The maximum permissible earthing impedance at a frequency fx depends on the upper limit of the operating currents of the RCD at that frequency. Note 4: The relationship between the frequency of the acceptable touch voltages and the dissipated power in the human body are under consideration. Until final values are fixed the maximum allowed touch voltage of 50 V for 50/60 Hz is recommended. a The values correspond to the threshold of ventricular fibrillation according to IEC/TS 60479-1 in combination with the frequency factor for ventricular fibrillation according to IEC/TS 60479-2. b IEC 60479 series gives no factors for frequencies above 1 kHz. 6 Marking and other product information 6.1 Marking for Type F RCDs Add the following symbol adjacent to the symbol for Type A, e.g., ; alternatively the following symbol may be used . 6.2 Marking for Type B RCDs Add the following symbol adjacent to the symbol for Type F, e.g.: . alternatively the following symbol may be used: . Note: Where a 4-pole RCBO is used for single phase supply the device should be connected and installed according to the manufacturer’s instructions. 7 Standard conditions for operation in service and for installation According to IEC 61008-1 or IEC 61009-1, as applicable. 8 Conditions for construction and operation 8.1 Conditions for Type F and Type B RCDs Requirements for operation in case of sinusoidal residual currents comprising of multi-frequency components resulting from control equipment supplied from single phase: a) Type F and Type B RCDs shall operate in response to a steady increase of composite residual current within the limits given in Table 4. Compliance is checked by the tests of 9.1.2. b) Type F and Type B RCDs shall operate in response to a sudden appearance of the residual operating current. For residual currents greater than 5 times the upper limit of Table 4 the maximum break time of RCDs of the general type shall be 0.04 s, and, for RCDs Type S, the minimum non-actuating time shall be equal to or greater than 0.05 s and the maximum break time shall not exceed 0.15 s. Compliance is checked by the tests of 9.1.3. 8.2 Conditions for Type B RCDs 8.2.1 Operation in response to the type of residual current 8.2.1.1 Residual sinusoidal alternating currents up to 1000 Hz Type B RCDs shall comply with the values given in Table 2 of this standard. Compliance is checked by the tests of 9.2.1.2a). Type B RCDs shall operate in response to a sudden appearance of the residual operating current given in Table 2. The maximum break time of RCDs of the general type shall be 0.3 s, and for RCDs type S the minimum non-actuating time shall be equal to or not lower than 0.13 s and the maximum break time shall not exceed 0.5 s.

Contents of GB/T 22794-2017

Foreword I Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Classification 5 Characteristics 6 Marking and other product information 7 Standard conditions for operation in service and for installation 8 Conditions for construction and operation 9 Tests Annex A (Normative) Number of samples to be submitted and test sequences to be applied for verification of conformity for type F RCCB Annex B (Normative) Number of samples to be submitted and test sequences to be applied for verification of conformity for Type F RCBO Annex C (Normative) Number of samples to be submitted and test sequences to be applied for verification of conformity for Type B RCCB Annex D (Normative) Number of samples to be submitted and test sequences to be applied for verification of conformity for Type B RCBO Annex E (Normative) Routine tests for Type F and Type B RCD Bibliography