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CTB-12 current transformer secondary overvoltage protector feature
Current transformer (CT) in the electric power system, widely used in measurement and control. Normal working hours, current transformer secondary side output voltage is low. But if in open-circuit secondary windings, or winding through the abnormal current (lightning current, resonance current, starting current capacitor charging current, inductance), will generate thousands of volts in secondary side often having tens of thousands of volts of voltage. Not only cause harm to the secondary system insulation, also makes drastic transformer burnt, even threatening the safety of staff
CTB-12 current transformer secondary overvoltage protectors for electrical parameters
Power AC-DC 85~265V 50HZ humidity ≤ 85%RH operating temperature-10 ° c ~70 ° c ≤ 2W power consumption normal leakage current Us <<1mA conduction voltage 170V Ts Ts ≤± 10% conduction time 20mS contact capacity AC220V,5A
CTB-12 current transformer secondary overvoltage protective device wiring methods
Under normal circumstances, current transformers are on the a, b, c three-phase, a few on the two-phase, on an individual in one phase. Wiring the vast majority of current transformer secondary windings for Star connection, few for Delta connection. Secondary overvoltage protection CTB-12 current transformer secondary winding star joins, secondary winding correspond to a, b, c connect the protection device terminals a, b, c, a, b, c three-phase secondary neutral point (virtual n) connection in CTB-12 current transformer secondary over-voltage protector n terminals. Winding of only a, b, c without Terminal does not affect the protection work. AC220V power AC220V terminal directly connected protective device, a normally open and one normally closed contact (shared between active end) for passive output terminals, for use by the user according to the actual need.
CTB-12 current transformer secondary terminals overvoltage protective device
CTB-12 current transformer secondary overvoltage protection device wiring diagram
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Arrester series
