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NF50-HRP Datasheet(PDF) 5 Page - Mitsubishi Electric Semiconductor |
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NF50-HRP Datasheet(HTML) 5 Page - Mitsubishi Electric Semiconductor |
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5 / 105 page  4 2.2 Digital ETR (Electronic Trip Relay) Mitsubishi’s electronic MCCBs are equipped with a digital ETR to enable fine protection. The digital ETR contains Mitsubishi’s original double IC (8 bit microcomputer and custom-IC). Digital detection of the effective value Electronic devices such as an inverter distort the cur- rent waveform. Mitsubishi’s PSS electronic breakers are designed to detect digitally the effective value of the current to minimize over-current tripping errors. This enables fine protection for the system. LSW : Long time-delay soft ware PSW : Pre-alarm soft ware WDT : Watch-dog timer circuit 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 CT CT CT CT LSW PSW Input and output I : Instantaneous circuit CV : Constant voltage circuit Phase- selection sampling circuit Short time-delay soft ware Trigger circuit Over-current indication LED Pre-alarm indication LED Pre-alarm output Standard equipped pre-alarm system Mitsubishi’s PSS electronic breakers have a pre-alarm system as a standard. When the load current exceeds the set pre-alarm current, the breaker lights up an LED and outputs a pre-alarm signal. Load M 1 ×103 1 ×102 1 ×104 102 103 10 10 1 0.1 0.01 Ir IP Pre-alarm current Current setting TL Current (A) Is Ts Load current High-voltage fuse- Allowable short-time characteristics Short time-delay tripping current Short time-delay operating time Instantaneous tripping current Long time-delay operating time Current-Converted value on the high-voltage side Switch with fuse High voltage Low voltage Transformer MCCB (electronic) Ii Processing of the digital ETR Sampling and A/D conversion Calculating the digitally effective value Processing the long time-delay pre-alarm characteristics |
Similar Description - NF50-HRP |
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