IEC 61557-6:2019 pdf download

IEC 61557-6:2019 pdf download.Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c.
4.2 Functions
4.2.1 Measurement of trip current
The measuring equipment shall be capable of indicating if and when the residual operating current of the protective device is less than or equal to the rated residual operating current. The tests shall be carried out with a sinusoidal, or mains-derived quasi sinusoidal test current. The operating uncertainty of the test currents, determined in accordance with Table 1 , shall not exceed (the rated residual operating current) +1 0 %. The operating uncertainty of measurement of the residual operating current, determined in accordance with Table 1 , shall not exceed ±1 0 % of the rated residual operating current. If the measuring equipment is provided for the purpose of testing residual current devices (RCD) of 30 mA or below, installed for supplementary protection, the measuring equipment shall be capable of providing a test of 5 times the rated residual operating current. The test period shall be limited to 40 ms. When measuring the trip time, this limit of test period need not be applied so long as the fault voltage remains below the touch voltage limit. If the measuring equipment is capable of producing half-wave test currents, testing of pulse current sensitive RCDs may alternatively be carried out using half-wave test currents. In this case, test equipment shall be able to test in both polarities. If the measuring equipment includes a test intended to be applied to residual current devices (RCD) type B, the test current shall be an increasing smooth direct residual current. NOTE A smooth direct current is a current with less than 1 0 % AC ripple (peak to peak). If the test current increases linearly, the rate of increase shall not be greater than 2 times I Δn in 5 s. If the test current increases in steps, the increase per step shall not be more than 2 times I Δn /30 and the rate of increase shall not be greater than 2 times I Δn in 5 s. It shall be possible to test with both polarities of the test current.
4.2.2 Non-tripping functions
When a test at 50 % or less of the rated residual operating current is included to test the immunity of the RCD to nuisance tripping, the minimum test period for general type RCDs shall be 0,3 s and for type S RCDs, it shall be 0,5 s. The protective device shall not operate. When a non-trip test at 50 % or less of the rated residual operating current is included, the operating uncertainty of the calibrated test current shall be in the range between 0 % and −1 0 % of the specified non-tripping test current in accordance with Table 1 .If the purpose of the test is to evaluate other parameters (e.g. fault voltage) the minimum test period may be shorter but not less than one cycle of the rated frequency.
4.2.3 Fault voltage indication
The measuring equipment shall be capable of indicating whether the fault voltage at the rated residual operating current of the protective device is less than or equal to the conventional touch voltage limit. The test may be carried out with or without a probe. Indication may be provided by displaying the value of the fault voltage or by the use of other clear indicators. If the value of the fault voltage or the indication for the fault current (shown on a display or otherwise indicated) show the value for the residual current and not for the rated residual operating current, this shall be indicated on the display or on the measuring equipment. Otherwise the fault voltage shall be calculated according to Equation 1 :