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The MIKO-8M(A) milliometer is developed to measure DC resistance in the range from 1 µOhm ÷ 10 kOhm for the current of up to 10А for:
Windings of power and measurement transformers, windings of electric motors, generators, linear compensators and windings of other high-inductance equipment;
Contacts of circuit breakers, resistors, buses and other inductance-free circuits;
Equalizing, current limiting and other resistors of high-voltage circuit breakers;
Сables.
Depending on the object type, you can select special measurement modes. For example, for a resistive object:
AUTO 1Ph mode has SKB EP patented automatic measurement method that guarantees results with the highest accuracy.
It is achieved by setting the max current in the measure- ment circuit not on a staggered basis (depending on the value of the measured resistance), but continuously w/o fixed measurement ranges in a wide load range.
This measurement mode provides high signal level in a complex electromagnetic environment of industrial production or substation. Moreover, in AUTO modes of the measurement process the instrument produces the highest current that enables guaranteed saturation of the transformer magnetic system.
MIKO-8M (A) has a built-in archive of up to 200 measurements for viewing, copying or deleting data. And thanks to the possibility of choosing an object at the measurement stage, the results are presented more systematically. This facilitates interaction with the archive.
OLTC in-place check mode allows the User to assess the state of the switching OLTC equipment with current limiting resistors without removing contactor tank cover.
This mode involves measuring of instantaneous current drops. Test current firstly passes through the transformer winding and then through OLTC contacts at changing from one tap to another. The DRM graph is built on the basis of the measurement results and shows current change during tap changing. This graph enables to check tap changing time and general object state.
Analysis of the acquired graphs enables not only to sort out OLTC by fault-free/faulty criteria, but also to define the nature of the defect eliminating opening of fault-free OLTCs. Milliohmmeter mode and DRM test complement each other and provide the User comprehensive informa- tion about the transformer state.
MIKO-8М(A) has the safety certificate IEC 61010-1. The instrument also meets the requirements of electromagnetic compatibility that are applied to class A instruments according to IEC 61326-1.
The instrument has a high degree of protection against:
None of the measuring cables is included in the standard equipment of the MIKO-8M(A) device.This allows the customer to choose exactly that kit.
For customer’s choice the MIKO-8M milliohmmeter has two modifications: with an in-built battery (MIKO-8MA) and without an in-built battery (MIKO-8M). The device can also be powered from the mains (≃ 110÷220, 330V).
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Instrument and covering documents: Calibration Certificate, User's Manual, and a Log Book. |
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As a matter of convenience for the user, measuring cables are not included in the standard complete set. Each user can select a cable to his/her own requirements. Select at least one measuring cable (see "additional complete set on order" below). |
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Mains cable 1 x 2 m. Weight 0.24 kg. |
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Ground cable 1 x 2.23 m. Weight 0.07 kg. |
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Resistance zero point accuracy check. Value – 0.000 µOhm. |
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Type: 75ShSM M3 (75ШСМ М3). For checking MIKO-8M operability. Value – 1 µΩ ± 0.5%. |
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Type: VP2B-1V-2A (ВП2Б-1В-2А) (2 pcs). For the power source protection. |
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Current cable 1 x 8.5 m with crocodile clips (jaw up to 80 mm). Weight 1.72 kg. |
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Current cable 1 x 8.5 m with a G-clamp (jaw up to 103 mm) for connection to transformer. Weight 2.26 kg. |
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Current cable 1 x 3 m. Weight 0.5 kg. |
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Current cable 1 x 4 m with crocodile clips (jaw up to 25 mm) for resistance measurement of CT and VT windings. Weight 0.61 kg. |
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Extension cable 1 x 6.5 m. Weight 1.18 kg. |
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Short-circuiting cable set 3 x 12m with crocodile clips (jaw up to 50 mm). Set weight 0.8 kg (0.26 kg + 0.27 kg + 0.27 kg). |
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Short-circuiting cable set 3 x 3m with crocodile clips (jaw up to 80 mm). Set weight 1.89 kg (0.63 kg + 0.63 kg + 0.63 kg). |
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For in-place OLTCs monitoring at apparent resistance of the winding of no more than 0.5 Ohm. |
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Удобная, прочная и износостойкая сумка для транспортировки кабелей, документации и прочих дополнительной комплектации к прибору МИКО-8М (МИКО-8МА). |
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For testing laboratories: inspection / calibration of the instrument. |
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The rod is designed to ensure convenient connection to contacts of a transformer inputs.
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Open Original
Our company has been using MIKO-8M ohmmeter since 2018.
The device is built into a good robust case that is convenient for transportation in the extreme conditions of Russian roads. Device is equipped with comfortable-to-use control via buttons and multi-touch screen. The key point when choosing a device was the upper board of resistance range, as we are faced with the measurements of voltage transformers, and the price. MIKO-8M seemed to be an ideal choice. One more advantage is that test cables are not included to the complete set of the device because we were able to choose the most suitable one and not to overpay for cables that we would not use in our work.
The device is doing well with the assigned tasks:
We would like to recommend MIKO-8M(A) milliohmmeter to other companies that are involved in the energy industry.
Open Original
We have been using MIKO-8M(A) for two months. And the following positive advantages were revealed during the operation process:
Revealed remarks:
Open Original
We have been operating MIKO-8M(A) milliohmmeter for two years, and the advantages of the device are the following:
The disadvantage is a small internal memory for information storing.
MIKO-8M(A) milliohmmeter deserves a high rating according to its characteristics. We are looking forward to new developments.
Open Original
In May 2018, MegionEnergoNeft LLC received a pilot operation of the MIKO-8 device for measuring the direct current resistance of windings of oil and dry transformers from 0.4 to 110 kV of various types and designs. The device was operated both during the repair of electrical equipment during the repair of power transformers, and at transformer substations in the course of acceptance tests of electrical equipment serviced by MegionEnergoNeft LLC.
During exploitation, the advantages of the instrument were revealed, for example: small dimensions, a convenient housing for transportation and operation, an intuitive menu, a built-in measurement archive that allows you to speed up the measurement, simplify the processing of the results and automatically recalculate the data. Measurements are carried out in a short time, which in comparison with other devices significantly reduces the time of measurements. A positive feature of MIKO-8 is the ability to measure the resistance of the windings of power transformers with on-load tap-changers without disconnecting the device from the network and the equipment being measured, which significantly reduces the time it takes to take measurements.
Information is displayed on a large contrast screen that allows readings without voltage. During operation, no shortcomings were detected, the device works flawlessly.
As wishes for additional equipment, there is not enough portable compact battery pack with a built-in charger and a plug for connecting in the field [Manufacturer comment: The MIKO-8 millimeter is discontinued – in its place is a new modification of the MIKO-8M / MIKO-8M(A) (with built-in battery)].
According to the results of trial operation, it was found that this instrument meets the declared characteristics and significantly superior to instrument of a similar purpo
SKB EP Company sells three types of instruments for measurement of DC electric resistance of windings of transformers, electric motors, electric magnets, cables and of other inductance and inductance-free circuits: the MIKO-7M, the MIKO-8M and the MIKO-9.
15 october 2018
SKB EP Company sells three types of instruments for measurement of DC electric resistance of windings of transformers, electric motors, electric magnets, cables and of other inductance and inductance-free circuits: the MIKO-7 with basic and updated software, the MIKO-7M, MIKO-8M and the MIKO-9.
1 february 2018We hope that next time you will be able to participate.
Our manager will contact you shortly to clarify the data.
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