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发表于 2021-8-13 10:08
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本帖最后由 jansle_happy 于 2021-8-13 10:09 编辑 9 Z' e, l5 I3 q/ P5 Q
大神看起来,应该不是说figure E只是个列子吧,看起来原文是前面描述了测试电路的特性,然后给出具体的图书如图E啊。& C; e' m4 o9 j2 y0 K
H.8.1.10 ACCESSIBLE PARTS shall not be considered as HAZARDOUS LIVE PARTS if separated from the supply by PROTECTIVE IMPEDANCE.
5 V' W) A# A. E, @! FH.8.1.10.1 When PROTECTIVE IMPEDANCE is used, the current between the part or parts and either pole of the supply source shall not exceed 0,7 mA (peak value) a.c. or 2 mA d.c;4 u" e9 ` I3 `
– for frequencies exceeding 1 kHz, the limit of 0,7 mA (peak value) is multiplied by the value of the frequency in kHz but shall not exceed 70 mA (peak value);4 u8 ]5 h4 @7 i s
– for voltages over 42,4 V (peak value) and up to and including 450 V (peak value), the capacitance shall
6 K2 Z7 U, _! l% bnot exceed 0,1 μF;
2 A* l5 f3 A# A0 A0 C$ H3 f– for voltages over 450 V (peak value) and up to and including 15 kV (peak value), the product of the capacitance in farads times the potential in volts shall not exceed 45 μC;" ?: M0 w4 y# E$ t+ K& B
– for voltages over 15 kV (peak value), the product of the capacitance in farads times the square of the potential in volts shall not exceed 350 mJ.
/ S' ]0 ]. A$ JCompliance is checked by measurement.
; ^6 d9 m6 G9 a5 m/ [2 KVoltages and currents are measured between a single ACCESSIBLE PART (or any combination of such parts)
' y/ n; \2 M8 Y6 t9 kand the protective earth conductor. Measurements shall be taken in normal supply configuration, and with
2 K$ T; a5 `) U- F; B. G4 U3 Vsupply poles interchanged.
5 j, {( p% Z2 M } x# dThe measuring circuit shall have a total impedance of (1 750 ± 250) W and be shunted by a capacitor such8 H6 Z. w, t! {8 n
that the time constant of the circuit is (225 ± 15) μs.7 _6 h1 ]) f3 O8 a: q- w: ?- l
Details of a suitable measuring circuit are shown in Figure E.1.) @6 o! V1 _! e, E/ _$ m
The measuring circuit shall have an accuracy of within 5 % for all frequencies in the range of 20 Hz to 5
1 B# `' S2 f; d/ M+ Y: g& O* e0 bkHz. For frequencies above 5 kHz, alternative methods of measurement are required. |
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