MIC
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Catalog excerpts

Non-directional, phase-to-phase and phase-to-ground overcurrent protection for AC systems. Digital Overcurrent Relay AC feeders, motors, transformers, etc. Overload protection Rapid short circuit detection Instantaneous and time overcurrent Phase and ground faults DESCRIPTION The MIC 1000 is a digital, microprocessor-based overcurrent relay that provides nondirectional phase to phase and phase to ground overcurrent protection. The relay’s overcurrent function can be inverse time, where four families of curves are provided, or definite time with four times offered, as well instantaneous operation with adjustable time delay. All of these features are offered in a single relay. Line current metering, both phase to phase and phase to ground, are provided with a meter. Faults are time tagged and the most recent fault and time are displayed. 4 inverse and 4 definite time curves Settings with front panel switches Line current metering and last trip data Part of a modular system Independent 4" modules 1/4 standard 19" rack cases available 2 digit display and reset button for the instantaneous unit), and a high drop-out to pick-up ratio (<95%), along with the instantaneous unit adjustment tap, allow optional coordination and reclosing, without compromising selectivity. Operation of the instantaneous unit can be blocked for both phase to phase and phase to ground conditions. CONSTRUCTION I accurate and reliable, with low I I I The MIC relay is applied on alternating current circuits (feeders, motors, transformers, etc.), and provides effective protection against overloads, and rapid detection of short circuits. Negligible overtravel (less than 50 ms for the time unit, less than 25 ms power consumption fixed rack, 1/3 case, 19" rack drawout, 1/4 case, 19" rack LED starting lamps and system availability indicators shock proof, non-flammable, sealed plastic case, which permits exterior reset of indicating LED’s anti-seismic waveform response high reliability solid-state components microprocessor system STANDARD FEATURES Front accessible time delay micro-switches. Time Unit The following characteristics are included in every relay: I BS 142 inverse I ANSI inverse I very inverse I extremely inverse I 2 sec definite time I 4 sec definite time I 6 sec definite time I 8 sec definite time (time dial adjustable from 0.05 to 1 in 0.05 steps)

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MIC Digital Overcurrant Relay STANDARD FEATURES MIC TECHNICAL SPECIFICATIONS PROTECTION CURRENT RANGES Instantaneous Unit Instantaneous unit time delay adjustable between 0 and 3.1 sec in 100 ms steps. Indicators Include: I green LED when in service I measuring unit starting LED’s I target LED’s for the measuring units (two for phase and ground relays) Reset Through front mounted push-button. Output Contact Selector Switch Output contacts can be selected from a two position selector switch which allows trip/alarm contact flexibility. Display Sequentially Indicates: I I I I I I Inverse Time...

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MIC 1 / 2Pages

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MIC
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