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Knowledge of safety capacitance

by:SMiLer     2021-02-25
Safety capacitance means used in such situations, the capacitor after failure, will not lead to electric shock, do not endanger personal safety. It includes the X and Y capacitors. Based on the limitation of leakage current, capacitance value Y cannot too big, general level X capacitor is uF, Y capacitor is nF level. Capacitance differential mode interference suppression X, Y capacitor common-mode interference suppression. GJB151 Y capacitor capacity should not be greater than zero. 1uF。 Y capacitance in addition to conform to the corresponding grid voltage withstand voltage, also claim the capacitor in the electrical and mechanical properties have enough safety margin, avoid short-circuit phenomenon under extreme environmental conditions appear breakdown, Y capacitance pressure performance is of great significance for protecting the personal safety. Considerations for power supply of electromagnetic interference suppression with capacitor when used in the power line circuit capacitor to eliminate noise, not only the normal voltage, also must consider the abnormal pulse voltage ( Like lightning) , this can lead to capacitor smoke or fire. So the cross line of capacitor safety standards in different countries have strict rules, so must use a capacitor safety certification. For Y2 class power electromagnetic interference suppression with capacitor shall be applicable to the capacitor failure does not lead to electric shock dangerous situations, when used in power across the line connection, can withstand the 5 kv impulse voltage surge, from occurrence breakdown phenomenon. IEC standards, safety capacitance, using advanced production technology and strict quality guarantee system. According to IEC 60384 - 14, and Y capacitance of the capacitor can be divided into X, 1. X capacitor refers to cross in L - N between the capacitor, 2. Y capacitor refers to cross in L - G/N- G between the capacitor. ( L =线,N =中立,G =地面) Under X capacitor is divided into X1, X2, X3, the main difference is that: 1. The X1 resistance to high pressure is greater than 2. 5 kV, less than or equal to 4 kV, 2. X2 high voltage less than or equal to 2. 5 kV, 3。 X3 high voltage less than or equal to 1. Under 2 kVY capacitance is divided into Y1, Y2, Y3, Y4, the main difference is that: 1. Y1 resistance to high pressure is greater than 8 kV, 2. Y2 resistance to high pressure greater than 5 kV, 3. High-pressure Y3 n / 4 a. Y4 resistance to high pressure is greater than 2. 5 kVX, Y capacitor is capacitance, the line of fire between the zero line is X capacitor, is Y capacitance between the wire and ground. They are used in power supply filter, power filtering effect, respectively for common mode, differential mode interference filter. Safety capacitance means used in such situations, the capacitor after failure, will not lead to electric shock, do not endanger personal safety. Safety capacitance safety level applications allow peak pulse voltage over-voltage level ( IEC664) X1> 2. 5 kv≤ 4. 0kV Ⅲ X2 ≤ 2. 5 kvⅡX3勒; 1. Security level 2 kv safety capacitance type insulation rated voltage range Y1 double insulation or reinforced insulation & ge; 250 v Y2 basic insulation or additional insulation & ge; 150 v≤ 250 v Y3 basic insulation or additional insulation & ge; 150 v≤ 250 v Y4 basic insulation or additional insulation & lt; 150 v Y capacitance of electric capacity must be restricted, so as to achieve control in the role of the rated frequency and rated voltage, the size of the flow through the leakage current and the purpose of the impact on the system EMC performance. GJB151 Y capacitor capacity should not be greater than zero. 1uF。 As for the safety standards of each country have some differences, but the rated voltage is 250 and 400. Must be emphasized, Y capacitors shall not be arbitrarily use nominal pressure AC250V or DC400V capacitors to substitute. 2. As one of safety capacitance X capacitor, also requires must obtain certification of safety inspection agencies. X capacitor are generally marked security authentication marks and compression AC250V or AC275V, but its real dc withstand voltage of 2000 v, don't use when using nominal pressure AC250V or DC400V capacitors to substitute. Actual need according to actual needs, the capacity of X capacitance value allowed is larger than the capacity value of Y capacitance, but this time must be in the X capacitor at both ends of the parallel resistance, a safety to prevent the power cord plug pull, due to the charging and discharging process of the capacitor to the power cord plug charged for a long time. Safety standard, when the working of the machine were pulled out the power cord, in two seconds, the power cord plug on both ends of the electric voltage ( Or to earth potential) Must be less than 30% of the rated voltage.
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