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Uses
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Protect Computers, CNC Machines and Telecommunication equipments from damage due to electrical noises, spikes etc.
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If ground potential of system units are different from each other and are exposed to the effects of instability at high frequencies.
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If ground of the equipment cannot be earthed.
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To shield large number of electronic equipments which individually are producing different types of electrical noise at a common busbar typically CNC machines, Drives, Hardening equipment etc. The use of NCT, being bidirectional, prevents damage due to circulating noise interference within them.
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To Protect against strong lightening, impulse noise, bus short-circuit, accidental discharge of capacitors |
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When multiple Noise Cut-off transformers are used, the suppression effects increase in proportion. Therefore, the effects of cascading Noise Cut-off Transformers is remarkable. |
Elecrical Noises are Generated due to :
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Switching of electrical utilities like Capacitors, MCCBs, ACB's...etc. Larger the inductance of the system and larger the current change during switching, larger the magnitude of electrical noises.
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The inductive loads like big Motors, Compressors, Overhead Cranes, Elevators, Presses etc. also generates substantial switching noises.
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Switching equipments like Invertors, Converters, SMPS etc. generate electrical noises due to switching of Thyristors, Transistors, Relays etc.
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Welding systems pollutes earthing systems, adds notches and high frequency noises in the wave form, generating power quality anomalies.
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Lightening, precipitation of static charges and electrical discharges in the atmosphere are the natural cause of generation of various electrical noises.
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Effects
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Electrical noises are observed to occur over a wide band of frequency ranging from 1 KHz to 100 MHz and above. In magnitude observed to be as high as 4000 to 6000 Volts on 3 phase supply system.
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The high frequency noise can interfere with digital electronic equipments causing untraceable data errors, change of programme, loss of memory, erratic behaviour, etc.
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The high voltage spikes can cause the failure of Thyristors or Transistor, Micro Processors and other sensitive devices.
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The radiated noise can interfere in operation of remote control equipment like Cranes, Digital Controls or Telecom Equipments.
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Lightening, precipitation of static charges and electrical discharges in the atmosphere are the natural cause of generation of various electrical noises.
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