OEM/ODM Manufacturer Miniature circuit breaker-FTB3 for Jakarta Factories
Exterior and dimensions
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|Model||FTB3 high breaking capacity MCB|
|Number of poles||1P||2P||3P||4P|
|Rated frequency:||AC 50/60Hz|
|Rated voltage (V) AC||230/400|
|Rated current (A)||C||6, 10, 16, 20, 25, 32, 40, 50, 63|
|D||6, 10, 16, 20, 25, 32, 40|
|Mechanical and electrical life:||20,000 operation|
|Installation||On symmetrical DIN rail 35mm /Panel Mounting|
|Connection capacity:|| Cross-section of conductors up to 25mm², Cross-section of busbar from 0.8-2mm²,
reversibility of connections
|Ambient temperature (°C)||-5 - +45 °C|
|Altitude (m)||not higher than 2000m|
|Relative air humidity||no more than 95%|
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Conventional CT are designed for secondary current of 1A or 5A suitable for high power requirement of Electro mechanical Meter /relays.
The accuracy of this CT is affected with the magnetizing curve of the core. Desired accuracy only available in linear portion of B-H curve.
The other measurement technique are low power sensors can provide long rated current, no saturation effect.they produce low voltage signal level to meet static measurement technique.
It consist of wire wound on a non magnetic core.
Measurement range from1A to 100KA.
Frequency response linear up to 700kHz.
Output is in the milli volt to several volts.
Affected by temperature variation.
The ICCS consists of an inductive current transformer having a primary winding, a small core and a minimized-loss secondary winding. The shunt resistor Rsh is an integral part of the secondary winding and converts the traditional current output to a voltage. Can measure up to Few tens of KA.
Development of Optical current sensor
Now there is a new offering in optical sensor technology from M/S VA Tech that claims to have been proven in the high voltage stations environment and enables wider application to be implemented with confidence.
The emergence of digital substation control/DDCMIS has provided further potential benefits from optical current and optical voltage transducers (OCT & OVT) like direct communication to substation network via digital protocol IEC-61850.
Integrating the optical current transducer with Breaker/AIS (air insulated switchgear) has further provided a very a strong , stable and long term alternative to conventional current measurement system for high voltage stations.