Product DescriptionHigh voltage current limiting fuse is applicable
to indoor AC 50Hz, rated voltages of 3.6KV, 7.2KV, 12KV, 24KV,
40.5KV, rated currents of 0.5 and 2, 3, 5, 7.5, 10A systems, and is
applicable to protecting the overload and short circuit faults of
outdoor 35KV voltage transformers and power lines. It can be used
together with other switching devices, such as load switches and
real contactors, as a protective element for short circuit and
overload of power transformers and other backup devices, and is
also a necessary supporting product for high-voltage switch frames,
ring network frames, and high/low-voltage prefabricated
substations.High voltage current limiting fuse has limited current
and rapidity. The peak value of fault current often appears half
wave. When the bridge body is disconnected, all short circuit
current will be transferred to the high-voltage current limiting
fuse. The internal short circuit current of the fuse will vaporize,
break down, generate arc between gaps and extinguish the arc in the
future and when it rises, limiting and forcibly cutting off the
short circuit current (t < 2ms), so that the current cannot
reach the expected peak value of short circuit current. When the
short-circuit current rises to Ip, the fuse will fuse and cut off
the current. The cut-off current Ip is only about 15% of the peak
value of the expected current, greatly reducing the impact of the
fault current on the electrodynamic force and thermal effect of
power generation and transformation equipment. The arc voltage
generated by the high-voltage current limiting fuse can be limited
by the nonlinear resistance, which can cooperate with the bridge
resistance to solve the problem of insufficient capacity of the
high-voltage current limiting fuse and improve the application
range of the entire device.The fuse is composed of a melt tube, a
porcelain bushing (silicone rubber insulation sheath), a fastening
flange, a transverse post insulator and a terminal. Fix the
terminal caps and melt pipes at both ends in the porcelain bushing
by pressing, and then fix the porcelain bushing on the rod post
insulator with a solid flange.The melt pipe adopts the care with
high silicon oxide as the arc extinguishing medium, and the metal
wire with small diameter is used as the fuse. When the overload
current or short circuit current passes through the melt tube, the
fuse will melt immediately. The arc occurs in several parallel
narrow slits. The metal vapor in the arc penetrates into the quartz
sand, is strongly dissociated, and quickly extinguishes the arc.
Therefore, the fuse has good performance and large breaking
capacity.Model DescriptionProduct technical parameters Product
structure features 1. High breaking capacity. Generally, the
rated short-circuit breaking current (expected effective value) of
domestic high-voltage current-limiting fuses is 50kA, and the rated
short-circuit breaking capacity of some imported products reaches
63kA.2. Current-limiting capacity, generally domestic high-voltage
current-limiting fuses, such as 100A fuses, the cut-off current
peak value is about 18kA when the effective value of the expected
short-circuit current is 50kA, while for a certain imported 100A
fuse, in When the expected short-circuit current effective value is
63kA, the cut-off current peak value is only 18kA.3. There is a
minimum breaking current. For current-limiting fuses for
transformer protection, the minimum breaking current is generally 3
to 5 times the rated current of the fuse. When selecting, it should
be ensured that its minimum fusing current is not greater than the
minimum short-circuit current of the protected circuit.4. The power
loss is small, which ensures that the product has a low temperature
rise. This feature is more beneficial when the fuse is used in a
fully enclosed insulation device. Low arc voltage: During the
breaking process, the arc voltage is low, and when it is used in a
system with a voltage lower than the rated voltage, the arc voltage
will be further reduced, so that the 12KV fuse can be used in a
12KV or 7.2KV system without damaging the system insulation
danger.5. The error of the characteristic curve is small, and the
error of the time-current characteristic curve is less than ± 10%,
which ensures the reliability of the product. Moreover, all comply
with the International Electrotechnical Commission (IEC) standard.
The busbar type can be directly fastened to the busbar with screws,
which has the advantages of small installation volume and reliable
contact; while the plug-in type is easy to replace and can be
operated with electricity.Products real shotA corner of the
production workshopProduct packagingProduct application
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