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NF100-HP Datasheet(PDF) 9 Page - Mitsubishi Electric Semiconductor |
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NF100-HP Datasheet(HTML) 9 Page - Mitsubishi Electric Semiconductor |
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9 / 105 page  8 sAutomatic Tripping Devices qThermal-Magnetic Type (100~800A Frame) 1. Time-Delay Operation An overcurrent heats and warps the bi- metal to actuate the trip bar. 2. Instantaneous Operation If the overcurrent is excessive, the amature is attracted and the trip bar ac- tuated. Fig. 3.3 qThermal-Magnetic Type (1000~4000A Frame) 1. Time-Delay Operation An overcurrent heats and warps the bi- metal to actuate the trip bar. 2. Instantaneous Operation If the overcurrent is excessive, magneti- zation of the stationary core is strong enough to attract the armature and ac- tuate the trip bar. Fig. 3.4 qHydraulic-Magnetic Type (30~60A Frame) 1. Time-Delay Operation At an overcurrent flow, the magnetic force of the coil overcomes the spring, the core closes to the pole piece, attracts the armature, and actuates the trip bar. The delay is obtained by the viscosity of silicon oil. 2. Instantaneous Operation If the overcurrent is excessive, the ar- mature is instantly attracted, without the influence of the moving core. Fig. 3.5 qPrinciple of Electronic Trip Relay (ETR) Operation 1. The current flowing in each phase is monitored by a current transformer (CT). 2. Each phase of the transformed current undergoes full-phase rectification in the rectifier circuit. 3. After rectification, each of the currents are converted by a peak-conversion and an effective-value conversion circuit. 4. The largest phase is selected from the converted currents. 5. Each time-delay circuit generates a time delay corresponding to the largest phase. 6. The trigger circuit outputs a trigger sig- nal. 7. The trip coil is excited, operating the switching mechanism. Fig. 3.6 Armature Trip bar Silicon oil Moving core Damping spring Pipe Coil Pole piece Bimetal Heater Armature Trip bar Latch Bimetal Latch Heater Stationary core Armature Trip bar Power-source side terminal Load-side terminal Breaking mechanism Test input Load-current indication LED (70%) Trip coil Custom IC I CV PSS WDT Microcomputer CPU Characteristics setting part A/D convertor SSW LSW PSW Input and output Trigger circuit Over-current indication LED Pre-alarm indication LED Pre-alarm output CT CT CT CT CT CT CT Power-supply side terminal Load-side terminal Test terminals Overcurrent display LED (1000~1600A Frame) (100~800A Frame) Switching mechanism Trip coil Peak conversion and largest-phase selection Effective value conversion and largest-phase selection Test-signal generator circuit Long- delay circuit Short- delay circuit Instan- taneous circuit Special IC |
Similar Part No. - NF100-HP |
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Similar Description - NF100-HP |
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