問題1:三相輸入,額定電壓480Vac(北美),X電容采用星型接法275Vac、X2的行不行呢?我問生產(chǎn)廠家,他告訴我這個電容(275Vac、X2)可以工作在額定電壓305Vac,只是標(biāo)示方法不同而已——對此我有些疑問,有沒有專門做安規(guī)電容的前輩來指點(diǎn)一下。
問題2:這個275Vac(電容上標(biāo)的),是不是指的額定工作電壓,我看廠家給我的資料上沒有列出他的最大允許工作電壓,問是多少,他又說不出來。
問題1:三相輸入,額定電壓480Vac(北美),X電容采用星型接法275Vac、X2的行不行呢?我問生產(chǎn)廠家,他告訴我這個電容(275Vac、X2)可以工作在額定電壓305Vac,只是標(biāo)示方法不同而已——對此我有些疑問,有沒有專門做安規(guī)電容的前輩來指點(diǎn)一下。
問題2:這個275Vac(電容上標(biāo)的),是不是指的額定工作電壓,我看廠家給我的資料上沒有列出他的最大允許工作電壓,問是多少,他又說不出來。
1 Capacitors used to bridge BASIC INSULATION, SUPPLEMENTARY INSULATION or REINFORCED
INSULATION shall be class Y except that it is permitted to bridge BASIC INSULATION in a SECONDARY
CIRCUIT by a class X capacitor.
2 The voltage rating of the capacitor shall be at least equal to the RMS WORKING VOLTAGE across the
insulation being bridged, determined according to 2.10.2.2.
3 For a single capacitor bridging FUNCTIONAL INSULATION, BASIC INSULATION or SUPPLEMENTARY
INSULATION, the peak test voltage of the capacitor shall be at least equal to the REQUIRED WITHSTAND
VOLTAGE.
4 For a single capacitor bridging DOUBLE INSULATION or REINFORCED INSULATION, the peak test voltage
of the capacitor shall be at least equal to twice the REQUIRED WITHSTAND VOLTAGE.
5 It is permitted to use a higher grade capacitor than the one specified, as follows:
- subclass Y1 if subclass Y2 is specified;
- subclass Y1 or Y2 if subclass Y4 is specified;
- subclass Y1 or Y2 if subclass X1 is specified;
- subclass X1, Y1 or Y2 if subclass X2 is specified.
6 It is permitted to use two or more capacitors in series in place of the single capacitor specified, as follows:
- subclass Y1 or Y2 if subclass Y1 is specified;
- subclass Y2 or Y4 if subclass Y2 is specified;
- subclass X1 or X2 if subclass X1 is specified.
7 If two or more capacitors are used in series, they shall
- all have the same nominal capacitance value;
- each be rated for the total RMS WORKING VOLTAGE across the insulation; and
- comply with the other rules above.
從上面看,電容至少要等于橋接的相電壓,275V的肯定不行,要480V的,即便是兩個電容串聯(lián),單個電容也滿足480V