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MIKO-7 with advanced function |
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| Field of application (measurement of electric resistance) | ||||
| Power transformer windings |
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| Windings of current and voltage instrument transformers |
(≤ 1 kOhm) |
(≤ 1 kOhm) |
(≤ 10 kOhm) |
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| Windings of electric magnets and motors |
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| Equalizing, current-limiting and other resistors of high-voltage circuit-breakers |
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| Contacts and contact connections of power and alarm circuits |
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| Cables |
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| In-place check of transformer LTCs | — | — |
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| Performances | ||||
| Range of measurement | 10 mkOhm ÷ 1 kOhm | 10 mkOhm ÷ 1 kOhm | 10 mkOhm ÷ 10 kOhm | |
| Amperage | 0.0014 ÷ 10.0 A | 0.0014 ÷ 10.0 A | 0.0014 ÷ 10.0 A | |
| Error of electric resistance measurement | ±0,1% | ±0,1% | ±0,1% | |
| Working temperature | −25 ÷ +40ºС | −25 ÷ +40ºС | −20 ÷ +40ºС | |
| Protection from: | ||||
| self-inductance emf |
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| instrument current surge |
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| voltage reversal at the battery cables ends |
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| overheating |
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| Display | Four-line alphanumeric display | Four-line alphanumeric display | Large color graphic TFT display 5.7” 640x480 | |
| Power | supply from the external battery | supply from the external battery | supply from the external battery | |
| Shock-proof | case | case | case | |
| Size | 270×250×130 mm. | 270×250×130 mm. | 270×250×130 mm. | |
| Weight | 3,2 kg | 3,2 kg | 3,2 kg | |
| Instrument functions | ||||
| Automatic determination of and setting the required instrument current |
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| Mode of automatic measurement of inductive load (the instrument automatically detects the moment of resistance determination and stops the measurements) | — |
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| Specialized mode of measuring the electric resistance of power transformer windings with LTC | — |
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| Additional computation functions | ||||
| Automatic computation of relative deviations of electric resistance of three-phase windings from one another | — |
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| Automatic conversion of linear electric resistance of 'delta' or 'star' connected windings into electric resistance of phase windings | — |
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| Automatic conversion of electric resistance of windings measured at current temperature into electric resistance at passport temperature (with account of the winding material) | — |
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| Automatic computation of deviations of measured and reduced to passport temperature values of electric resistance of windings versus passport values of resistances | — |
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| Automatic computation of winding temperature versus its passport value of electric resistance and passport temperature | — |
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| Archive of measurements in the instrument | — |
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| Instrument control using PC | — |
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| Software for PC | ||||
| Systematization and storage of the results on PC | — |
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| Preparation of a report | — |
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| In-place check and express diagnosis of LTC state at any weather conditions without removing the contacts box cover | — | — |
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| Construction of the assessment diagram and analysis of curves of the measured facility right on the instrument | — | — |
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| Determination of fault location in LTC: e.g., determination of the break in current-limiting resistors, poor contact of a selector, etc. | — | — |
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| Compensation of errors due to external emf | — | — |
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| Ability to connect extended potential contacts | — | — |
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