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What is the use of high-voltage fuse
Date:2015/11/14 hit count:0
High voltage fuse a simple set of motor circuits are usually fuse, contactor, thermal relay, motor and other components. According to experience, in this line, select the fuse rated current is about 1.2~1.5 times the rated current of the motor.
The overload current and short circuit current will cause the conductor and cable temperature to be too high, which will lead to the insulation failure of the conductor and cable. Fuse for wire and cable overload protection can be arranged in the wire and cable wire inlet end and outlet end, rated current of the fuse link is about 1.25 times of the line current; short circuit protection fuse must be installed in the wire and cable into the end of the line, the rated current of the fuse link about tripping current 1.45 times.
In the capacitor switching device, the fuse is pushed for short circuit protection, the rated current of the fuse is not less than 1.6 times of the rated current of the capacitor.
Power semiconductor devices small heat capacity, high voltage bushing must have rapid fuse protection under fault condition. The fast fuse has the similar thermal characteristics with the semiconductor device, so it is a good protective device. Fast fuse with general principles are as follows:
Rated voltage: UN rated voltage fuse should be slightly larger than the fault circuit across the fuse fusing the external AC voltage. If the load of semiconductor equipment is active inverter, high voltage load switch inverter type brake motor inverter load should be considered semiconductor device is out of control caused by the possibility of equipment of DC side short circuit, this fast fuse blows, melting at both ends of the AC voltage and a direct current voltage superposition phenomenon, the rapid melting off the rated voltage shall be calculated using the following formula:
UN is greater than or equal to Uac + Udo x 1 / tick type 2: Uac: fuse fusing applied AC voltage; Udo: semiconductor equipment load end inverse variant DC voltage.
Breaking i2t: when the semiconductor device with fast fuse series, semiconductor device allows the I2tD value should be greater than the value of quick - fuse I2tF, or fuse blown, the device also is burning. The relationship between the two should be met: I2tF = 0.9I2tD.
Rated current: INF rated current of the fuse is in the actual current through the fuse circuit in the effective value of IF as the basis, and considering the effects of environmental temperature, cooling condition, current margin and other factors were calculated. INF = K * IF type: K value of general 1.5~2. The self cooling type fuse K takes great value, especially to fuse both ends of the connecting wire special short circuit, take the maximum value; minimum of water-cooled fuse K. Fast Fuse Rated current trend will increase over the selection of fuse I2tF, protection of semiconductor devices is harmful.
Break over voltage: fuse in the arc reduction, produced by high voltage insulator in the line voltage and excessive overvoltages will reverse breakdown of the semiconductor device, so broken voltage must be less than or equals to semiconductor devices allow peak reverse voltage. Fast fuse to produce an over voltage (peak) for fault voltage (RMS) about 2~2.5 times.
Rated breaking capacity: Fast Fuse Rated breaking capacity should be greater than that of the semiconductor devices in fast fuse breaking through fault current peak, the general should include values of semiconductor devices in the valve side of the transformer internal short circuit current and DC side short circuit currents, otherwise will lead up to quickly fuse explosion, on arc and other accidents
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Add:Xiangyang Industrial Zone, Liushi, Wenzhou,P.R. China 
Contact Person:Candy zhao 
Tel:0086-577- 62600386 62602786
Fax:0086-577-62600796
P.C:325604
E-mail: xk@cnxiya.com
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