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Microcomputer Dc System Insulation Monitoring Unit

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Application:
Mainly applied in the places where direct current power source is needed, such as: electricity, oil and chemical industry, railway, communication, steel and finance and so on, to monitor at real time the insulation state of DC power source system.
Functions:
* Monitor the busbar voltage of DC system normal or not.
* Monitor the plus minus grounding insulation of DC system and measure out the generatrix, branch circuit and the corresponsive isolative resistance of insulation decline. * Big liquid crystal screen adopted and system operating state display. (including generatrix voltage, plus generatrix grounding voltage, minus generatrix grounding voltage, plus generatrix grounding insulation, minus generatrix grounding insulation, branch circuit state, warning record, parameter setup) * History warning data recording ( including generatrix over voltage, generatrix under voltage, generatrix insulation decline, branch circuit insulation decline) saving, inquiring, and deleting and so on. * Insulation state of whole DC system could be displayed in upper monitor through communication. * Liquid-crystal screen display; operation key-press; independent working; esp. suitable for the upgrading of old system.
* Able to detect the plus-minus simultaneous earthing, plus-minus equivalent earthing of generatrix or branch circuit.
* Automatic CT’s scope and zero point calculation by software with long term and high reliability.
* Automatic demagnetizing, deleting the zero affection by short- circuit pulse current affects on CT, completely removing error report.
* Adopt high accurate AD sampling and measuring accuracy of generatrix voltage could reach 0.2%
* No signals transfused to system, no affection on the secure operation of DC system.
* Strict and sensible software design assures no error reporting and no omissive reporting.
* Numerous amount of branch circuit measuring, 16 branch collecting modules can be connected at most and each collecting module and detect 32 branch circuits. Therefore, 16×32=512 branch circuits could be detected.
* Generatrix, branch circuit both adopt software self-calculating method for adjusting conveniently
* Big liquid-crystal screen display, clear and direct-viewing.
* Shuttle-controlling key-press operation, simple and convenient.
* Adopt standard chassis, nice appearance and easy installation.
* Data exchange with system monitor through RS-485 interface.

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