untitled BRITISH STANDARD BS EN 50065 2 3 2003 Incorporating Amendment No 1 and Corrigendum No 1 Signalling on low voltage electrical installations in the frequency range 3 kHz to 148,5 kHz — Part 2 3[.]
BRITISH STANDARD BS EN 50065-2-3:2003 Incorporating Amendment No and Corrigendum No Signalling on low-voltage electrical installations in the frequency range kHz to 148,5 kHz — Part 2-3: Immunity requirements for mains communications equipment and systems operating in the range of frequencies kHz to 95 kHz and intended for use by electricity suppliers and distributors The European Standard EN 50065-2-3:2003, with the incorporation of amendment A1:2005, has the status of a British Standard ICS 33.040.30; 33.100.01 12&23 95 % % reduction duration in s EN 61000-4-11 d) Surges Common mode Differential mode 1,2/50 (8/20) r r Tr/Tn s kV (peak) kV (peak) EN 61000-4-5 B e) Fast transients r 5/50 kV (peak) Tr/Th ns Rep frequency kHz EN 61000-4-4 B NOTE The test level can be defined as the equivalent current into a 150 : load - 13 - c) NOTE Except for the ITU broadcast frequency band 47 MHz to 68 MHz where the level shall be V NOTE Applicable only to input ports NOTE Manufacturers are strongly recommended to design to performance criterion B in order not to cause problems for users If it is necessary to use criterion C the instruction shall draw attention to the need to manually reset the equipment after voltage dips or interruptions EN 50065-2-3:2003 Table – - I mmunity: Earth port (functional ground terminal) Environmental phenomenon a) b) Test specification Units Basic standard Radio-frequency common mode Amplitude modulated 0,15 to 80 80 MHz V % AM (1 kHz) EN 61000-4-6 Fast transients ± 0,5 5/50 kV (peak) Tr/Th ns Rep frequency kHz EN 61000-4-4 Remarks Performance criterion See NOTE A EN 50065-2-3:2003 The test level specified is prior to modulation See NOTE B Use of the capacitive clamp NOTE The test level can be defined as the equivalent current into a 150 : load NOTE Applicable only to ports interfacing with cable whose total length may exceed m according to the manufacturer's functional specification - 14 - – 15 – 7.2.2 EN 50065-2-3:2003 Narrow-band conducted interference The purpose of this test is to verify the immunity of the MCES from narrow band conducted interference caused either by MCES operating in different frequency bands as defined in EN 50065-1 or by out-of-band disturbances at frequencies above 148,5 kHz The test is made at spot frequencies in the band from kHz to 30 MHz, excluding the band (or sub-bands) listed in 4.1 or 4.2 of EN 50065-1 in which the signalling equipment operates The interference source and coupling network is shown in Figure The signal source shall produce a signal, at each frequency used for each test, which is amplitude modulated with 000 Hz at 80 % depth At each frequency the output of the coupling circuit shall be connected to a suitable measuring instrument and the amplifier adjusted such that the strength of the unmodulated signal is at the level specified in Table The signal purity shall be such that harmonics and sub-harmonics of the test signal which fall in the frequency band used by the EUT are no greater than 80 dB(μV) in magnitude NOTE Due to the modulation method, the peak envelope value is about dB above the values shown in the table, which correspond to the maximum true transmitter output levels according to EN 50065-1 These values are considered to be sufficient since the impedance of the supply system is much less than that of the V-network NOTE The breadth of the frequency range used for this test may require that more than one amplifier / transformer combination is required, each combination being used for a part of the frequency range in question The measuring instrument is then disconnected from the coupling network and the disturbing signal is applied to the EUT using port A in the circuit in annex A It shall be verified that the EUT continues to function in accordance with the performance criteria given in Table NOTE It may be necessary to take measures to protect the amplifier from the effects of direct connection to port A These may include removing the power supply from the test network before connecting the interference source and coupling network and by a slow increase in applied mains voltage thereafter Wide-band Amplifier Signal Source μF capacitor 50 : resistor ~ 1:1 ratio transformer Figure – Signal source and coupling network for narrow-band conducted interference test EN 50065-2-3:2003 – 16 – Table – Input a.c power ports Frequency range ab Level dB(V) Criterion 134 (note 1) A 10 kHz to 94 kHz 134 to 120 (notes and 2) A 96 kHz to 124 kHz 134 B 126 kHz to 139 kHz 134 B 141 kHz to 147,5 kHz 134 B 0,150 MHz to 30 MHz 66 A kHz to kHz NOTE For equipment intended to operate in the band 125 kHz to 140 kHz only, spurious harmonics in the signal source, or created by non-linearities in the test circuit, may cause a false “band-in-use” indication thus preventing the transmitter from operating In this case, criterion B shall be applied and the test then repeated using signals 20 dB(V) below those shown in the table and with criterion A applied NOTE The value decreases linearly from 134 dB(V) to 120 dB(V), with the logarithm of the frequency a The frequency bands listed are not continuous but are separated from each other by at least kHz This is to ensure that the test signal, including its sidebands, is wholly contained in the corresponding bands given in EN 50065-1 b The signals used for the purpose of this test may not always be representative of the signals encountered in practice It may therefore happen that systems operating in different frequency bands as well as, more generally, systems operating in the same frequency band, may disturb each other and appropriate measures (e.g the use of filters) may be necessary In this case appropriate information shall be included in the operating instructions supplied with the equipment – 17 – EN 50065-2-3:2003 Annex A (normative) Test circuit used for immunity tests A.1 Test circuit specification The test circuit or general measuring set-up used for any test having performance criteria A or B is that shown in Figure A.1 It is recommended that this arrangement is also used for tests having performance criterion C NOTE Criterion C is not used in this part and is retained only for compatibility with other parts of this standard Text deleted NOTE The figure shows the case of testing for frequencies from kHz upwards Port B Mains Supply Additional filter section Artificial network A to CISPR 16-1 50 : Termination Additional filter section Stimulus 660 H choke 660 H choke Artificial network B to CISPR 16-1 EUT 50 : Termination Port A NOTE The filter section provides mutual isolation between the two artificial networks and prevents unwanted signal transmissions, via the mains supply Figure A.1 - Test circuit EN 50065-2-3:2003 – 18 – Port B Port A is used for the tests a), d) and e) in Table and tests a), b) in Table should be used to apply tests b) and c) in Table in order that the operation of the stimulus, connected to artificial network A, is not also disturbed by the test The tests of Table to Table 3, inclusive, are carried out on the ports on the equipment under test specified in those tables A.2 Method of testing Where the equipment under test is capable of both receiving and transmitting signals and its correct operation is verified by transmission of an acknowledgement, or similar signal, the equipment shall be tested in the receiving mode only, the reception of an acknowledgement being considered evidence of its ability to transmit Equipment which is capable of operating either only as a transmitter or only as a receiver shall be tested in that mode and correct operation shall be verified by observation of status indicators (if any) and the state of any input or output ports Where performance criterion A or B applies the equipment under test shall be observed during testing to ensure that there is no change in the status of any inputs or outputs and any externally observable data shall be examined before and after testing to ensure that there has been no change in this data Externally observable data means, in this context, data which may be displayed on the EUT (for example on an LCD or LED screen), and any data which may be read electronically either by means of a data port on the EUT or by communication over the network Changes in data relating only to the internal operation of the equipment under test, such as communication error logs, and which are not directly related to the intended function of the equipment shall be ignored