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Magnetically latched device such as flux shift trip device along with an electronic release are used in circuit breaker so as to protect it against faulty condition. Performance of this device gets effected due to external local magnetic field generated by the conductors, which is terminated at the line and load terminal of the MCCB. In order to avoid this suitable shielding of the FSD is done by...
Unlike to current transformer, a residual current sensor is highly sensitive to the input leakage current and core material. It senses the leakage current that is produced due to faulty condition in the electrical circuit or unintentional body touch to the equipment through conductive tracking of the insulation medium. The leakage current which the sensor detects consists of ac residual current with...
Residual current device being highly sensitive, demands a low coercive and high permeable magnetic material. It should be able to sense all type of signals such as AC with variable frequency, pulsating half and full wave dc, mixed dc and pure dc etc. Conventional soft magnetic material which are used for current sensing, though have moderate to high permeability but are easily influenced with the...
With the rapid advancement in smart grid and smart cities across the world there have been great demand for smart meters and protection devices such as digital meter and microprocessor based release and protection unit. These high burden devices demand air cored current sensor with micro-VA and low level signal sensitivity. One such family of current sensor which has been widely accepted is rogowski...
It's been a practice to use a back up contactor in addition to master contactor to evaluate the electrical life of the test contactor for AC - 3 utilisation category. It is expected that the life of the test contactor is in few millions, which the back - up contactor may not be able to support as during each make - break operation there is heavy erosion of contact material due to arcing. It demands...
It's been a practice to use a back up contactor in addition to master contactor to evaluate the electrical life of the test contactor for AC-3 utilisation category. It is expected that the life of the test contactor is in few millions, which the back — up contactor may not be able to support as during each make — break operation there is heavy erosion of contact material due to arcing. It demands...
Hybrid contactor is a switching device, which while making & breaking an electrical circuit do not draw any arc between its cathode & anode electrode. This is achieved since the making & breaking of the load is done by the solid state device and rated current is carried by the electromechanical contactor. The starting current & its duration being very high for any load, it needs special...
Electromechanical switching device while making & breaking an electrical circuit is subjected to arcing which is responsible for faster contact wear out, burning of insulation and conductive tracking between the poles. This leads to premature failure and poor electrical life of the device. To avoid the above problem it has been a practice to use solid state switching device. However owing to its...
Most of the current sensors use a special core material for sensing the electromagnetic field generated by the current carrying primary conductor. This core especially for current transformer is made out of permeable magnetic materials, which are subjected to iron losses and hence high temperature rise contributed due to both iron & copper loss. At high current the materials gets saturated and...
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