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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
& ]" I7 E. ^% R2 v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。
, n/ T" P0 I0 a* I2 k9 VH.8.1.10 ACCESSIBLE PARTS shall not be considered as HAZARDOUS LIVE PARTS if separated from the supply by PROTECTIVE IMPEDANCE.1 @$ N7 z3 a9 a% @7 z" g
H.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;; y3 f9 r% b( w
– 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);
) s4 S0 l1 `' G5 m– for voltages over 42,4 V (peak value) and up to and including 450 V (peak value), the capacitance shall5 k v: S" b8 E) j
not exceed 0,1 μF;! d& O8 n. N0 M9 D
– 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; K4 u7 j8 b; q/ p
– 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.1 g, T a% z S" h* m/ b! d% V
Compliance is checked by measurement.# P% G- C& A9 P! [0 W
Voltages and currents are measured between a single ACCESSIBLE PART (or any combination of such parts)
6 \% z% c! t; \0 o6 D8 y( v; a) [and the protective earth conductor. Measurements shall be taken in normal supply configuration, and with
/ @: G- k$ \( r. `supply poles interchanged.* T& K( \7 o6 I6 R) H7 d
The measuring circuit shall have a total impedance of (1 750 ± 250) W and be shunted by a capacitor such
$ ]- F0 l/ z6 u& |+ f" f7 \that the time constant of the circuit is (225 ± 15) μs.. V f- l% z" a4 A4 l, z# u
Details of a suitable measuring circuit are shown in Figure E.1.: Y+ X" K1 [. V1 {' a
The measuring circuit shall have an accuracy of within 5 % for all frequencies in the range of 20 Hz to 5
; H( D2 P8 R$ i1 q7 x/ Z7 Z, tkHz. For frequencies above 5 kHz, alternative methods of measurement are required. |
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