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爬电距离和电气间隙的确定

更新时间:2023-05-27 19:09:23 阅读： 评论：0

Guidance for the measurement of clearances and creepage distances
The rated voltage and overvoltage category are determined (e annex K).
The following information on overvoltage categories is extracted from IEC 60664-1.
Overvoltage category is a numeral defining a transient overvoltage condition (瞬态过电压状态).
Equipment of overvoltage category IV is for u at the origin of the installation
4类设备在源安装地点使用(例如电源表\过流保护设备)
Equipment of overvoltage category III is equipment in fixed installations and for cas where the reliability and the availability of the equipment is subject to special requirements
3类设备是固定设施中的安装的以及有特殊可靠性要求的设备(例如在固定设施中的开关以及连接到固定设施的工业化设备)
Equipment of overvoltage category II is energy consuming equipment to be supplied from the fixed installation.
2类设备是从固定设施中供电的耗能设备
If such equipment is subjected to special requirements with regard to reliability and availability, overvoltage category III applies
如果此类设备有特殊的可靠性要求的化就按3类处理\
Equipment of overvoltage category I is equipment for connection to circuits in which measures are taken to limit transient overvoltages to an appropriately low level
1类设备是指用于电路连接以及限制瞬态过压低水平的设备(例如保护电路)
电气间隙的确定
The rated impul voltage is determined from table 15.
Table 15 – Rated impul voltage
mary loui parker
Rated voltage
V
Rated impul voltage
V
Overvoltage category
I
II
III
≤50
>50 and ≤150
>150 and ≤300
330
800
1 500
500
1 500
2 500
800
2 500vampires
4 000
NOTE 1 For multi-pha appliances, the line to neutral or line to earth voltage is ud for rated voltage.
NOTE 2 The values are bad on the assumption that the appliance will not generate higher overvoltages than tho specified. If higher overvoltages are generated, the clearances have to be incread accordingly.
Table 16 – Minimum clearances
Rated impul voltage
V
Minimum clearance a
mm
330
龙拳小游戏500
800
1 500
2 500
4 000
6 000
8 000
10 000
0,5 b, c
0,5 b, c
0,5 b, c
0,5 cfeedly
1,5
3,0
5,5
8,0
11,0
a The distances specified apply only to clearances in air.
b The smaller clearances specified in IEC 60664-1 have not been adopted for practical reasons, such as mass-production tolerances.
c This value is incread to 0,8 mm for pollution degree 3.
爬电距离的确定
The working voltage, pollution degree and material group(如何确定)are determined.
The creepage distances of basic insulation and supplementary insulation are measured and compared with the minimum values specified in table 17. A particular creepage distance is then compared with the corresponding clearance of table 16 and enlarged if necessary in order not to be less than the clearance. For pollution degree 1, the reduced clearance bad on the impul voltage test can be ud. However, the creepage distance can not be less than the values of table 17.
The creepage distances of functional insulation are measured and compared with the minimum values specified in table 18.
The creepage distances of reinforced insulation are measured and compared with twice the minimum values specified in table 17.
Table 17 – Minimum creepage distances for basic insulation
Working voltage
V
Creepage distance
mm
Pollution degree
1
2
3
Material group
Material group
I
II
IIIa/IIIb
I
II
IIIa/IIIb
>50
>125
>250
>400
>500
>800
>1 000
>1 250
fdf>1 600
>2 000
>2 500
>3 200
>4 000
>5 000
>6 300
>8 000
>10 000
and
and
and
and
and
and
and
and
and
07年考研英语真题and
and
and
and
and
and
and
and
<=50
<=125
<=250
<=400
<=500
emergencystop<=800
<=1 000
<=1 250
<=1 600
<=2 000
<=2 500
<=3 200
<=4 000
<=5 000
<=6 300
<=8 000
<=10 000
<=12 500
0,2
0,3
0,6
0,4
1,0
1,3
1,8
2,4
3,2
4,2
5,6
7,5
10,0
12,5
16,0
20,0
25,0
32,0
40,0
0,6
0,8
1,3
1,0
2,0
2,5
3,2
4,0
5,0
6,3
8,0
10,0
12,5
16,0
20,0
25,0
32,0
40,0
50,0什么是报考点
0,9
1,1
1,8
1,4
2,8
3,6
4,5
5,6
7,1
9,0
11,0
14,0
18,0
22,0
28,0
36,0
45,0
56,0
71,0
1,2
1,5
2,5
2,0
4,0
5,0
6,3
8,0
10,0
12,5
16,0
20,0
25,0
32,0
40,0
50,0
63,0
80,0
100,0
1,5
1,9
3,2
2,5
5,0
6,3
8,0
10,0
12,5
16,0
20,0
25,0
32,0
40,0
50,0
63,0
80,0
100,0
125,0
1,7
2,1
3,6
2,8
5,6
7,1
匹克英文
9,0
11,0
14,0
18,0
22,0
28,0
36,0
ttyx
45,0
56,0
71,0
90,0
110,0
140,0
1,9 a
2,4
4,0
3,2 b
6,3
8,0
10,0
12,5
16,0
20,0
25,0
32,0
40,0
50,0
63,0
80,0
100,0
125,0
160,0
NOTE 1 Lacquered conductors of windings are considered to be bare conductors, but creepage distances need not be greater than the associated clearance specified in table 16 taking into account 29.1.1.
NOTE 2 For glass, ceramics and other inorganic insulating materials that do not track, creepage distances need not be greater than the associated clearance.
NOTE 3 Except for circuits on the condary side of an isolating transformer, the working voltage is considered to be not less than the rated voltage of the appliance.
a Material group IIIb is allowed if the working voltage does not exceed 50 V.
b is for functional insulation

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