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0102030405

HFSC-12 High Voltage Dropout Expulsion Fuse Cutout Polymer Type

Characteristic:

Voltage: 15~27kV

Current: 100A/200A/300A

Creepage: 420mm

Standard: IEC60282-2

product details

product description

Description

Drop-out fuses are suitable for power systems with a frequency of 50HZ and a rated voltage of 35KV and below, and are installed on the high-voltage side of distribution transformers or on the main lines of distribution. The main function is where the protection performance is not high, it can be used in conjunction with the isolating switch to replace the automatic air switch; it can also be used in conjunction with the load switch to replace the expensive circuit breaker. It also has short circuit protection, overload and isolation circuits.

Structure

The fuse is composed of two major parts: the base and the arc extinguishing device, the lower end of the interrupter tube is equipped with a spring bracket that may rotate, always keep the fuse in tension to ensure that the interrupter tube is self-locking in the closed position, the line and transformer overload or short circuit, the fuse fuses, the fuse is quickly withdrawn from the interrupter tube, the interrupter tube is designed as a step-by-step exhaust type to solve the contradiction of breaking the size of the current on the same fuse.

Working principle

The load drop fuse has added elastic auxiliary contacts and arc extinguishing cover to break the load current. When the drop fuse is in normal operation, the fuse tube is tensioned by the fuse to form a closed position. When a fault occurs in the system, the fault current causes the fuse to be blown quickly and an arc is formed. The arc suppression tube is heated by the arc and decomposes a large amount of gas, which makes a high pressure in the tube, and blows strongly along the pipeline, and the arc is quickly elongated and extinguished. After the fuse is blown, the lower static contact loses tension and turns down, so that the tightening mechanism releases the fuse tube, and the fuse tube falls to form an obvious breaking position. When the load needs to be pulled, use the insulating rod to open the moving contact, at this time the active and static contacts are still in contact, continue to use the insulating rod to pull the contact, the auxiliary contact is also separated, an arc is generated between the outlets, and the arc is extinguished The slit of the cover is elongated, and at the same time, the arc extinguishing cover generates gas, and when the current crosses zero, the arc is extinguished.

Use environmental conditions

1. Normal use conditions of the product:

a) Ambient air temperature: upper limit +40°C, lower limit -30°C;

b) The altitude does not exceed 1000m;

c) The maximum wind speed does not exceed 35m/s;

d) There is no frequent violent vibration.

2. The product is not suitable for the following places:

a) Places where there is a danger of burning or explosion;

b) Places with severe vibration or shock;

c) Areas with electrical conductivity, chemical gas effect, serious pollution (not exceeding pollution level: Grade III), and salt fog.

Installation requirements

1. The fuse should be installed vertically to prevent the arc from falling on the adjacent live parts.

2. The fuse and the fixed contact should be in contact with each other in a straight line and without inclination.

3. For drop-type fuses, the axis of the melting tube should be 15~30° from the vertical line, and its rotating part should be flexible, and it should not touch other objects when falling.

4. The specifications of the fuse should meet the design requirements, there should be no bending, flattening or damage, and the fuse and the contact should be pressed tightly and firmly.

5. The rated current of the fuse and the fuse (wire or sheet) must be marked on the fuse. The capacity of the fuse should meet the requirements of the protected electrical appliance. The fuse that has not been verified or marked with no rated current is not allowed to be used.

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