Вопросы и ответы
+7 (3952) 719-148
ООО «СКБ ЭП»

Address: Lermontov Str., 130, Off. 226, Irkutsk, Russia, 664033

Main site of «SKB EP», LLC: www.skbpribor.ru

+7 (3952) 719-148

skb@skbpribor.ru

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Questions and answers

Do MIKO-7 or MIKO-8 automatically demagnetize the transformer after measuring the winding resistance?

No, neither MIKO-7 nor MIKO-8 does that. Electric current can be measured prior to the open-circuit test. Perform the open-circuit test first, then measure resistance of the transformer windings to direct current. In 1-3 days the transformer will demagnetize in a natural way.

What is the output current of the instrument?

From10 to 0.001А. At resistance above 0.3 ohm the amperage decreases. Thus, high amperage allows saturation of the magnetic core, which considerably reduces the time of measurements.

What is the time of measurements?

Time of measurement depends on inductance of the controlled object and averages from 20 seconds to 1.5 minutes.  Maximum time of measurement is 7 min 51 s. It was recorded during testing the ORDC-533000/330000 transformer.

Does winding inductance impact the results of measurements?

Its impact is reduced to the maximum extent as minimum drift of the instrument current is ensured: <0.002%/s.

Why the function of winding temperature calculation is included into MIKO-7 and MIKO-8 functions?

This function allows more accurate determination of conditions the transformer winding is. If according to the results of calculations the deviation of resistance between windings does not exceed 2%, we can assume that winding is in good order. Knowing such passport values of a  transformer as resistance, temperature of resistance measurement and winding material we can calculate working temperature of the winding. Winding overheating accelerates the insulation aging and, hence, reduces the service life of a transformer.

What are the advantages of four-cramp connection of the instrument cables?

It perfects the accuracy of measurements as in this case  the cable resistance and resistance between cable cramps and transformer inputs have no impact on the results of measurements.

What would be the effect of self-inductance emf on MIKO-7 in case of the circuit break?

In case of the circuit break (e.g., in case of cable rupture or faulty LTC) the self-induction emf occur.  MIKO-7 and MIKO-8 have in-built protection from critical voltage at open elements and parts of the instrument.  But deliberate stop of measurements by breaking the instrument cables may result in a failure of the instrument protection. Therefore, please follow the safety rules.


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