22 Years Factory Moulded case circuit breaker-FTM2-DC for Kenya Importers

Overview:



Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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With the "Client-Oriented" business philosophy, a rigorous quality control system, advanced manufacturing equipment and a strong R&D team, we always provide high quality products, excellent services and competitive prices for 22 Years Factory Moulded case circuit breaker-FTM2-DC for Kenya Importers, We always hold the philosophy of win-win, and build long-term cooperation relationship with customers from around the world.We believe that our growth base on customer's success, credit is our life.


FTM2DC001

Frame size Inm(A): 160 250 400 630
Rated current (A): 20,25,32,40,50,63,80,100,125,160, 160,180,200,225,250 250,315,350,400 400,500,630
Poles: 3 4 3 4 3 4 3 4
Rated voltage (V) AC: DC250,DC500,DC750,DC1000
Rated insulationvoltage(V): 1000 1000 1000 1000
Rated impulse withstand
voltage Uimp(KV):
800 800 800 800
Breaking Capacity: S S S S
Ultimate short-circuit capacity Icu (KA) DC250V: 30 / 30 / 30 / 30 /
DC500V: 25 / 25 / 25 / 25 /
DC750V: 15 15 15 20 15 20 15 20
DC1000V: / 10 / 10 / 10 / 10
Service short-circuit capacity
Ics (KA)
DC250V: 75%Icu / 75%Icu / 75%Icu / 75%Icu /
DC500V: 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu
DC750V: 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu
DC1000V: / 75%Icu / 75%Icu / 75%Icu / 75%Icu
operating performance Electrical life: 3000 3000 1000 1000
Mechanical life: 10000 10000 5000 5000
Arcing distance(mm) No more than 50 No more than 50 No more than 50 No more than 50
Class A
L(mm) 155 165 257 275
W(mm) 90 120 105 140 140 184 210 280
H1(mm) 68.5 69.5 95 95
H(mm) 100 105 154 154




Electrical Faults ¦ Fault In Electrical Transmission Line ¦ Reason of faults ¦
Hi everybody, today I will share about Electrical Faults.
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An electric power system, a fault or fault current is any abnormal electric current. For example, a short circuit is a fault in which current bypasses the normal load. An open-circuit fault occurs if a circuit is interrupted by some failure. In three-phase systems, a fault may involve one or more phases and ground, or may occur only between phases. In a “ground fault” or “earth fault”, current flows into the earth. The prospective short circuit current of a predictable fault can be calculated for most situations. In power systems, protective devices can detect fault conditions and operate circuit breakers and other devices to limit the loss of service due to a failure.
There are I explain mainly two types electrical faults.
Symmetric fault. And
Asymmetric fault.

Symmetric fault
A symmetric or balanced fault affects each of the three phases equally. In transmission line faults, roughly 5% are symmetric. This is in contrast to an asymmetrical fault, where the three phases are not affected equally.
Asymmetric fault
An asymmetric or unbalanced fault does not affect each of the three phases equally. Common types of asymmetric faults, and their causes:
line-to-line. a short circuit between lines, caused by ionization of air, or when lines come into physical contact, for example due to a broken insulator. In transmission line faults, roughly 5% – 10% are asymmetric line-to-line faults.
line-to-ground . a short circuit between one line and ground, very often caused by physical contact, for example due to lightning or other storm damage. In transmission line faults, roughly 65% – 70% are asymmetric line-to-ground faults.
Reason of faults.
Insulation failure or break down.
Lighting surge.
Unbalance current or voltage.
Voltage drop.
Stability fall.
Mechanical fault in transmission line.
Over voltage.
Under Frequency.
Reversal of power.
Temperature Rise.

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Electrical Faults ¦ Fault In Electrical Transmission Line ¦ Reason of faults ¦
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content source by https://en.wikipedia.org/wiki/Fault_(power_engineering)

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