保险丝有何作用?
发布网友
发布时间：2022-12-28 12:16
共1个回答
热心网友
时间：2023-10-23 01:05
不明白吗？ 我的意思是保险丝是甚么，及有何用途。
保险丝（Fuse）的作用系保护电气产品不会受外界电压不稳定或过高时，起一个保护作用，当超过它容许通过的电流时就会烧断，另一方面相反的，如电气本身出了问题，引至电流流动过大，亦起了一个安全的作用，把电源断开以免造成火灾。 保险丝有好多种，最多使用的系热断式，用于一般大多数的家电、影视、音响。还有就是可恢复式，如家中的电箱掣箱内的，故障排除后把保险丝的开关复位就可再用，之后还有快溶式、慢溶式用于特殊场合。 常见的保险丝，电流小的有几十 mA的，用于小型电子产品，大的有几百 Amp。用于楼宇或重型机电，数值大小通常都会标于当眼的地方。
type of current (Basic): 1. AC current (under 220/380 rated voltage) 2. DC current (in HK -No DC power trmission system) 3. Harmonic Current -AC mode 4. ...........design
measure
calculation
...... Current : I; unit: Ampere (A) type of fuse; (not included the circuit breaker) 1. BS3036 Rewireable fuse
(Less fault current capacity
subject to size of element) 2. BS88 Part 2 HRC/HBC fuse
(High fault current capacity) 3. Twins fuse (like pair of BS88) protect the power electronic equipment. e.g. variable speed drive (at least 200kW rated) 4. BS1362 general 13A plug fuse Function of fuse: 1.equipment overload protection 2.short circuit protection mean- e under design fault current
isolated the power source
rece the equipment or fire burn risk. Type of fuse's element: 1. copper 2. platnium 3. alumimium (less) 4. others Insulation of element: 1. air 2. minerals Rating of fuse(AC); 1. BS3036
less in market
5A
15A
30A 2. BS 88 part-2
2A
5A
6A
10A
15A
20A
30A
45A
60A
80A
100a
125A
. ......up to 800A (all kinds
please refer to IEE regulation such as BS7671) 3. BS 1362
2A
5A
10A
13A
(20A not specific BS standard) note: DC fuse
less proct in the market (mon to use in circuit breaker)
参考: own knowledge
I am electrician
