24kV Current Limiting Fuses) 2019-05-29T01:27:17+00:00

24kV Current Limiting Fuses)

Features

◆ Protects high-voltage circuits and equipment from over current and short circuit current
◆ Economically effective and has high interruption abilities
◆ The lightest product available in the market
◆ Has 50kA of interruption capacity, which makes it the perfect product for circuit protection

  • Watertightness-high quality
    Fuse manufactured by Joongwon uses patented manufacturing system and even homogeneous parts and therefore offers watertightness in any situations. The company also monitors 100% of its products very thoroughly to ensure that its excellent manufacturing processes are always implemented.
    Through this, Joongwon fuse has a safety life of 30 years indoors and outdoors.
  • Consumption-low power loss
    The size of fuse holders used in equipments such as SF6 gas insulated switchgear (GIS) has been minimized. Therefore, it needs an additional way of releasing the heat that is generated.
    As shown in its electrical specification, Joongwon fuse has a very low electricity consumption, and therefore generates little heat.
    This shows that the quality of Joongwon fuse in comparison to other products in the market is definitely better.
  • Minimum melting current-breaking capacity
    Joongwon fuse has been made according to international standards, meaning that it can interrupt current in any situations including minimum fusing current and rated breaking current.
    Also, it has a low minimum fusing current compared to other products in the market, while having a larger rated breaking current, which makes it a better option for circuit protection.
    This is Joongwon fuse’s unique characteristic, which proves its superior quality.
  • Searchability-control
    Quality monitoring system of Joongwon aims to minimize permissible variety in quality including part shelf-life, main circuit resistance (20℃) and weight. Such information is automatically stored in a computer system.

Applications
24kV 630A / Load Break Switch: High-voltage current limiting fuse is being used in combination with other protective equipment, as it is outstanding and economically effective in protecting high-voltage circuit or high-voltage equipment from over current and short circuit current. Our product is the lightest in the market and has a high interruption capacity of 50kA, which makes it the perfect product for circuit protection.

Inquiry

Ratings

 Type Rated voltage(kV) Rated current(A) Dimensions(mm) Weight(kg)
H L ∅D
IB-D0 24kV 2 442 510 53 2.3
IB-D1 6.3
10
16
20
25
31.5
40
IB-D2 50 58 3.0
63 77 4.8
IB-D3 80
100
IB-D4 125 86 5.8
160
200

Fuse base

Type Rated voltage(kV) Rated current(A) Impulse withstand voltage(BIL.kV)
JWF-24 24 200 125

Cut-off current characteristics to 36kV
High-voltage limiting current fuse effectively limits the current flowing in a circuit.
The fuse acts quickly in the presence of short circuit current, which means that the maximum short circuit current is interrupted before 1/2 cycle.

Example) in a circuit with short circuit current of 10kA
If the wave of the circuit is symmetrical, its maximum instantaneous current reaches 14kA (point A). If it is asymmetrical, its maximum instantaneous current reaches 25kA (point B). In any case, if the circuit uses a rate current of 40A, the maximum instantaneous current is limited at 5.3 kA (point C)

Electrical characteristics

Type Rated voltage(kV) Rated current(A) Rated breaking current / I11) (kA) Minimum step current / I32) (A) Rated power loss(W)  Resistance at 20℃(mΩ) I2t (kA2s)
50% 100% Prearcing arcing
IB-D0 24kV 2 31.5 16 4 16 3290 0.005 0.3
IB-D1 6.3 50 49 4.0 20 500 0.007 4.5
10 31 9.7 42 315 2 22
16 55 11 57 165 3 28
20 81 13 60 110 4 31
25 121.5 11 64 73 4.2 34
31.5 162 15 77 55 5 39
40 200 20 115 44 6 42
IB-D2 50 262.5 21 112 28 7 50
63 350 24 140 22 9 107
IB-D3 80 456 38 225 18.3 19 166
100 550 45 260 13.2 24 208
IB-D4 125 25 750 100 595 11.5 28 220
160 950 69 310 9.0 32 235
200 1040 79 576 8.0 34 240

1) I1 = Rated breaking capacity.
2) I3 = Minimum melting current.

* With regards to specifications other than what is listed above, please make an enquiry to us.
* 12/36kV fuse is imported and sold and will require prior arrangements.

Application guide

Transformers protection

 Rated fuse current(A) Transformers power(kVA)
2 14 25
6.3 43 75
6.3 57 100
6.3, 10 72 125
6.3, 10 86 150
10, 16 115 200
16 144 250
16, 20 173 300
16. 20 202 350
20, 25 230 400
20, 25 260 450
25, 31.5 288 500
25, 31.5 346 600
31.5, 40 404 700
31.5, 40 433 750
31.5, 40 461 800
40, 50 519 900
40, 50, 63 577 1,000
50, 63 721 1,250
63, 80 866 1,500
80 1,010 1,750
100 1,154 2,000
100, 125 1,443 2,500
125, 160 1,732 3,000
160, 200 2,309 4,000
200 2,598 4,500

The fuse’s specification must be below the over current of the circuit or equipment that is to be protected. The heat released from its activity must be smaller than the short circuit.
If you are using the fuse as a back up of a protective equipment, you need to make sure that the protective equipment acts quicker than the fuse in current that is below the minimum interruption current of the fuse.
You also need to make sure that the fuse acts quicker than the protective equipment of the power, but later than that of the resistance aspect.

Selection condition
Transformer magnetizing current is hypothesized to last for 0.1s in the magnitude of 10 on the transformer full-load current.
Interruption within 0.2 s in the second short circuit current of the transformer.

Capacity protection

Rated voltage(kV) Phase Capacitor’s power Rated fuse current
24 less than 40 6.3
40 ~ 90 10
90 ~ 140 16
140 ~ 200 20
200 ~ 280 25
280 ~ 400 31.5
400 ~ 600 40
600 ~ 800 50
800 ~ 1100 63
1100 ~ 1400 80
1400 ~ 1900 100
1900 ~ 2500 125
2500 ~ 3100 160
3100 ~ 4000 200

* Condenser’s magnetizing current is selected by hypothesizing a carrying current that is 71 times that of the rated current and lasts for 0.002s.
* Fuse’s rated current is selected to carry 1.5 times the rated current of the condenser.