Advanced precision milli-ohmmeter MIKO-9A

Certificates

  • Safety Test Certificate IEC 61010-1:2001
  • Conformity certificate with safety requirements EC/EU
  • Russian State Register Certificates
  • Declaration of Conformity of the Customs Union

Resistance measurement in inductive and non-inductive circuits in the range of 1 μΩ - 30 kΩ

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Automatic measurement of three-phase transformers

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Simultaneous resistance measurement across 2 windings

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AUTO demagnetization mode

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Non-demountable estimation of the OLTCs (DRM test)

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Heat run test

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Various auto calculations and non-volatile memory

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High level of protection and safety conformity

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Autonomy, TFT touch display, remote control and bluetooth data transfer

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MIKO-9A milli-ohmmeter is developed to measure DC resistance in the range of 1 µΩ - 30 kΩ with test current up to 10 А, as well as to generate oscillograms of a switching contactor in the high-speed OLTC; it also provides for demagnetization and "Heat Run Test".

MIKO-9A diagnostic objects:

  • Windings of power and instrument transformers, windings of electric motors, generators, linear compensators and windings of other high-inductive equipment;
  • Contacts of circuit breakers, resistors, buses and other non-inductive circuit;
  • Compensatory, current limiting and other resistors of high-voltage circuit bre­akers;
  • Сables.

Test current range is specified both in automatic and manual modes; resistance measurement range is set automatically. The instrument ensures fully automated resistance measurement of highly inductive load and thermal EMF balancing in external circuit.

MIKO-9A implements specialized measurement modes for various configurations of 11 objects (resistive object, inductive object, voltage transformer, current transformer and power transformer, generator, motor, reactor, compensator, connection filter and magnet), taking into account their specific features. The user can select a standard object from the list, or create his own object.

The device automatically takes into account the configuration of the object for setting measurement modes.

Watch detailed video-reviews about MIKO-9A milli-ohmmeter up above or on our YouTube. Watch videos and subscribe.

Depending on the object type, special measurement modes can be selected. For a resistive object, the modes are completely similar to the MIKO-8М(А), and for an inductive object, in addition to the two modes MANUAL and AUTO 1Ph, you can select AUTO 3Ph and 2 WINDINGS.

AUTO 3Ph makes it possible to simultaneously connect to three phases of the transformer and take measurements with automatic switching between them. This mode reduces the amount of reconnecting to/from the object under test.

AUTO 1Ph and AUTO 3Ph modes have SKB EP patented automatic measurement method that guarantees results with the highest accuracy.

It is achieved by setting the max test current in the measurement 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.

Depending on the object type, special measurement modes can be selected. For a resistive object, the modes are completely similar to the MIKO-8М(А) device, and for an inductive object, in addition to the three modes MANUAL, AUTO 1Ph and AUTO 3Ph, you can choose 2 WINDINGS mode.

This mode enables resistance measurement simultaneously on two windings, and guarantees a quick and reliable measurement of the electrical resistance of heavy power transformers, in particular, with secondary windings delta connected when using traditional methods does not give a stable result.

The device indicates which phases should be connected to accelerate the measurement process, taking into account the distribution of magnetic fluxes in the magnetic circuit. In addition, the simultaneous measurement of two windings reduces the total number of test cable reconnection from 6 to 3.

Demagnetization mode is designed to eliminate the remnant magnetism of the transformer magnetic core. It is compulsory to be made before open-circuit test, short-circuit loss measurement, transformation ratio measurement, etc.

The instrument can be used for demagnetization of both single-phase and three-phase transformers. Magnetic core demagnetization requires alternating current applied to the corresponding winding bidirectionally.

Demagnetization is performed automatically. Current decreases with each direction change. Each rod of a three-phase transformer is subjected to demagnetization.

Current change is at the same time displayed in a graph form to control demagnetization accuracy. Demagnetization stops automatically when the current reaches threshold value or upon the user’s command

OLTC non-demountable check mode allows the user to assess the state of the switching OLTC equipment with current limiting resistors without removing the contactor tank cover.

This mode involves measuring of instant test current values. Test current firstly passes through the transformer winding and then through OLTC contacts at switching 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 the opening of fault-free OLTCs. Milli-ohmmeter mode and DRM test complement each other and provide the user comprehensive information about the transformer state.

The test is performed by continuous measurement and periodic result saving of the transformer winding resistance (recalculated to t°) during the cooling process of the winding.

To receive the most reliable information about the max winding t° the user should connect the instrument to the winding and start the measurement immediately after the transformer heating is stopped.

Before the start of the measurement process the user has to specify winding, phase, max measurement duration, frequency of measurement results saving, winding resistance and temperature under normal conditions. Correlation between the winding temperature and the time can be represented in tabular or graphical form. The time is counted from the moment of the measurement start. Heat run test stops automatically on expiry of preset test duration or manually by the user.

MIKO-9A has a built-in archive of up to 1,000 measurements for viewing, copying or deleting data. And due to the possibility of choosing an object at the measurement stage, the results are presented more systematically. This facilitates interaction with the archive.

The group of MIKO-7M(A), MIKO-8M(A) and MIKO-9A instruments has a number of automatic recalculation functions:

  • Auto δ calculation of Rphase between one another.
  • Auto conversion of Rlinear to Rphase. Linear windings are Delta or Star without neutral connected.
  • Auto correction of R measured at to R at t°p taking into account the winding material.
  • Auto δ calculation between Rcorrected and Rp.
  • Auto calculation of by its R.

Measurement results are automatically saved to the non-volatile memory and can be later processed by special software on PC or transmitted via Bluetooth to a smartphone.

MIKO-9A 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:

  • test cable or mains cable breakdown;
  • excess of test current;
  • EMF of self-induction;
  • overheat of the test block.

At disconnection of the test cable from transformer bushings or from the instrument as well as at disconnection of the mains cable from the mains in the course of measurement, EMF of self-induction of up to several kV is generated in the disconnected circuit and the electric arc appears in the break point.

MIKO-9A is characterized by the redundant protection against EMF of self-induction in case of involuntary disconnection of the test cable or mains cable protecting users from electric shock and the instrument from being damaged.

MIKO-9A instrument can be powered from the mains (AC 90-253 V, 47-63 Hz // DC 127-354 V) or from a built-in battery.

Color graphic display of high brightness ensures easy reading on a sunny day, whereas intuitively understandable interface with a sensor display facilitates the instrument use.

The instrument can be manipulated either from the film keyboard or from the sensor display, as suits.

The instrument can be built into the testing systems under control of software complexes of test laboratories and equipment manufacturers. It is supported by Modbus RTU Protocol.

Specifications Value
Resistance range 1 μΩ - 30 kΩ
Resolution capability 0.1 μΩ
Accuracy ±(0.1%+0.5 µΩ)
Test current output 0.0005 A - 10 A
Test current range in DRM mode 0.1 A - 10 A
Measurement display resolution 5 digits
MIKO-9A: Power supply (built-in battery) Li-ion battery
MIKO-9A: Battery charge time 3 hours
MIKO-9A: Duration of continuous operation of the battery 8 hours
Built-in memory up to 1,000 measurements
PC connection USB, RS-485 and Bluetooth
Display Color graphic TFT touch, 800 x 480 pixels
Power consumption 120 W
Output capacity, W 60 W
MIKO-9A: Power supply (mains voltage) 90-253 V AC, 47-63 Hz
127-354 V DC
Dimensions 270 х 250 х 130 mm
MIKO-9A: Main instrument weight 4.0 kg
Operating temperature range -20ºС - +55ºС
Environmental protection with open cover IP40
Environmental protection with closed cover IP67
Interface and user manual language English
Testing period 3 years
Calibration period 3 years
Warranty period 3 years

Standard complete set

Photo Item, Index Application
MIKO-9A main instrument
  • MIKO-9A main instrument
  • 041.00.000-01
  • MIKO-9A main instrument
  • 041.00.000-01

Instrument and documents: User Manual, and a Log Book.

Test cables <br><b>on order</b>
  • Test cables
    on order
  • Test cables
    on order

As a matter of convenience for the user, test cables are not included to the standard complete set. Each user can select a cable to his/her own requirements.
Please, select at least one test cable (see "additional complete set on order" below).

Mains cable
  • Mains cable
  • 018.09.00.000
  • Mains cable
  • 018.09.00.000

Mains cable 1 x 2 m. Weight 0.24 kg.
For instrument connection to the main network. Temperature range -25°С - +120°С. Rubber insulation.

Ground cable
  • Ground cable
  • 010.01.00.000
  • Ground cable
  • 010.01.00.000

Ground cable 1 x 2 m. Weight 0.08 kg.
For instrument grounding. The cable is equipped with a ground clamp and a screw end cap. Nominal test current is 50 A.

Zero resistance standard
  • Zero resistance standard
  • 023.15.00.000
  • Zero resistance standard
  • 023.15.00.000

Resistance zero point accuracy check. Value – 0.000 µOhm.

Shunt
  • Shunt
  • Shunt

Type: 75ShSM M3 (75ШСМ М3). For checking MIKO-9A operability. Value – 1 mΩ ± 0.5%.

Fuses
  • Fuses
  • Fuses

Type: VP2B-1V-2A (ВП2Б-1В-2А) (2 pcs). For the power source protection.

USB 2.0 A-B Cable
  • USB 2.0 A-B Cable
  • USB 2.0 A-B Cable

USB cable 1 x 1.8 m. For computer connection and data transfer.

Attachment devices set kit
  • Attachment devices set kit
  • 126.06.02.000
  • Attachment devices set kit
  • 126.06.02.000

Additional complete set (on order)

Photo Item, Index Application
Test cable<br>(set of 2 pcs.)
  • Test cable
    (set of 2 pcs.)
  • 041.18.00.000
    041.18.00.000-01
  • Test cable
    (set of 2 pcs.)
  • 041.18.00.000
    041.18.00.000-01

10A Kelvin Clamp test cable 2 x 8.5 m (jaw up to 70 mm) for connection to transformer bushings. Set weight 3.45 kg (1.72 kg + 1.72 kg).
Elastic silicone tube resistant to low and high temperatures and corrosive media.

Test cable<br>(set of 2 pcs.)
  • Test cable
    (set of 2 pcs.)
  • 041.22.00.000
    041.22.00.000-01
  • Test cable
    (set of 2 pcs.)
  • 041.22.00.000
    041.22.00.000-01

10A Kelvin Clamp test cable 2 x 8.5 m (jaw up to 70 mm) for connection to transformer bushings. Modification of the 041.18.00.000(-01) cable. To be used on transformers with bushings located close to each other. Set weight 3.45 kg (1.72 kg + 1.72 kg).
Elastic silicone tube resistant to low and high temperatures, and corrosive media.

Test cable<br>(set of 2 pcs.)
  • Test cable
    (set of 2 pcs.)
  • 041.30.00.000
    041.30.00.000-01
  • Test cable
    (set of 2 pcs.)
  • 041.30.00.000
    041.30.00.000-01

10A Kelvin Clamp test cable 2 x 3.5 m (jaw up to 50 mm) for connection to transformer bushings. To be used on transformers with bushings located close to each other. Set weight 1.52 kg (0.76 kg + 0.76 kg). Elastic silicone tube resistant to low and high temperatures, and corrosive media.

Test cable
  • Test cable
  • 041.19.00.000
  • Test cable
  • 041.19.00.000

10A Kelvin test cable 1 x 3 m. Weight 0.5 kg.
With 2 probes and 4 crocodile clips (jaw up to 25 mm) (length: 70 mm, plug: 3 mm) for contact resistance measurement of CT and VT contact joints and windings.

Test cable<br>(set of 2 pcs.)
  • Test cable
    (set of 2 pcs.)
  • 041.26.00.000
    041.26.00.000-01
  • Test cable
    (set of 2 pcs.)
  • 041.26.00.000
    041.26.00.000-01

10A Kelvin C-clamp test cable 2 x 8.5 m (jaw up to 103 mm) for connection to transformer bushings. Set weight 4.42 kg (2.2 kg + 2.22 kg).
Alternative version of test cables 041.18.00.000(-01).

Test cable<br>(set of 2 pcs.)
  • Test cable
    (set of 2 pcs.)
  • 041.29.00.000
    41.29.00.000-01
  • Test cable
    (set of 2 pcs.)
  • 041.29.00.000
    41.29.00.000-01

10A Kelvin Clamp test cable 2 x 3.5 m (jaw up to 70 mm) for connection to transformer bushings. Set weight 1.87 kg (0.92 kg + 0.95 kg). Elastic silicone tube resistant to low and high temperatures and corrosive media.

Test cables for CT and VT
  • Test cables for CT and VT
  • 041.21.00.000
  • Test cables for CT and VT
  • 041.21.00.000

10A Kelvin Clamp test cable 1 x 4 m (jaw up to 20 mm) for resistance measurement of CT and VT windings. Weight 0.61 kg.

Cable is used for CTs and VTs which are stand-alone or built into transformers / circuit breakers.

Test cable
  • Test cable
  • 041.28.00.000
  • Test cable
  • 041.28.00.000

10A Kelvin test cable 1 x 3 m, 0,54 kg, with spring-loaded probes. To be used for electrical resistance measurement in hard-to-reach place.

Test cable extension<br>(set of 2 pcs.)
  • Test cable extension
    (set of 2 pcs.)
  • 031.20.00.000
  • Test cable extension
    (set of 2 pcs.)
  • 031.20.00.000

Extension cable 2 x 6.5 m. Set weight 2.33 kg (1.17 kg + 1.16 kg).
Elastic silicone tube resistant to low and high temperatures and corrosive media.

To be used together with test cables 041.18.00.000/(-01) (jaw up to 80 mm), 041.22.00.000/(-01) (jaw up to 80 mm) and 041.26.00.000/(-01) (jaw up to 103 mm).

Short-circuiting cable<br>(set of 3 pcs.)
  • Short-circuiting cable
    (set of 3 pcs.)
  • 041.23.00.000
  • Short-circuiting cable
    (set of 3 pcs.)
  • 041.23.00.000

Short-circuiting cable set 3 x 3 m with crocodile clips (jaw up to 70 mm). Set weight 1.89 kg (0.63 kg + 0.63 kg + 0.63 kg).

The set is used for applying the DRM-test by short-circuiting secondary circuits. This cable is for OLTCs of power transformers.
Furthermore, this cable is needed for connecting high-voltage and low-voltage windings when 2 windings mode is applied.

Short-circuiting cable (set of 3 pcs.)
  • Short-circuiting cable (set of 3 pcs.)
  • 035.31.00.000
  • Short-circuiting cable (set of 3 pcs.)
  • 035.31.00.000

Short-circuiting cable set 3 x 12 m with crocodile clips (jaw up to 50 mm). Set weight 0.8 kg (0.27 kg + 0.27 kg + 0.27 kg).

The set is used for applying the DRM test by short-circuiting secondary circuits. This cable is for OLTCs of power and auto transformers.

Additional resistor
  • Additional resistor
  • 032.25.00.000
  • Additional resistor
  • 032.25.00.000

For non-demountable OLTC monitoring at total resistance of the winding of no more than 0.5 Ω.
Length 0.11 m + 0.35 m. Weight 0.23 kg.

KMDLAX-6P plug
  • KMDLAX-6P plug
  • KMDLAX-6P plug

An adapter for the RS-485 cable for the analyzer communication with the SCADA-controlled measurement system.

Adapter for a reference coil
  • Adapter for a reference coil
  • 023.12.00.000
  • Adapter for a reference coil
  • 023.12.00.000

For testing laboratories: inspection / calibration of the instrument.
Length 0.025 m + 0.16 m. Weight 0.04 kg.

Tool bag
  • Tool bag
  • 126.06.00.000
  • Tool bag
  • 126.06.00.000

Convenient, robust, wear proof bag for transportation of cables, documentation and other accessories to the MIKO-9A instrument.
Weight 0.6 kg.

Manipulating rod
  • Manipulating rod
  • 010.41.00.000
    010.41.00.000-01
    010.41.00.000-02
  • Manipulating rod
  • 010.41.00.000
    010.41.00.000-01
    010.41.00.000-02

Manipulating rod is designed for test cables connection from the ground or from the tank cover to the bushings of high-voltage circuit breakers, and to the structural elements of high-voltage disconnecting switches and earthing devices, without the use of ladders or elevated platforms.

The manipulating rod is completed with special extension cables. There is a Kelvin clamp with current and potential contacts to connect to the object on one side, and a contact pad on the other side. The device test cable is connected to the contact pad from the ground or a tank cover.

Manipulating rod extension cable is made according to a four-wire (Kelvin) scheme with the test current capacity of 100 A in the presence of a good contact.

  • Open Original

    Uranenergo, LLP

    For 1 year MIKO-9A milli-ohmmeter is been used in the laboratory of insulation testing and over voltage protection service.

    The device is used to test the resistance of substation equipment. During the operation, device was distinguished by its simplicity in assembling the measuring circuit, reliability when taking into account operation temperature conditions, relative speed of measurements that makes it possible to reduce the time during testing. The compactness and low weight of the device simplify the operation and transportation process. The resistance measurement function is the best because of the accuracy and quick detection of results. It is also worth noting that the mode of non-demountable diagnostic of OLTC devices is very convenient for assessing the state of the switching device and significantly reduces the amount of work. Since the device has been used relatively recently, no electrical equipment malfunctions have been detected.

    Despite the short period of use, for the quality, versatility and conformity of price and quality, Uranenergo, LLP confidently recommends MIKO-9A for testing high-voltage equipment, and hopes for the appearance of new and innovative devices manufactured by SKB EP, LLC.

  • Open Original

    Yamalo-Nenets enterprise of the main power networks the branch of FGC UES, PJSC

    Yamalo-Nenets enterprise of the main power networks the branch of FGC UES, PJSC thanks your company SKB EP, LLC for the fruitful cooperation in the supply of measuring instruments for the diagnostic of high-voltage equipment. We also thank you for prompt, professional work and individual approach, as well as for the high quality of instruments and its components.

    Our company operates such instruments as MIKO (10 pcs.), and PKV (10 pcs.) manufactured by SKB EP, LLC.

    These instruments are used to determine repair quality of high-voltage circuit breakers and disconnecting switches. The contact resistance of the current-carrying circuit, the time and speed characteristics of HV circuit breakers are checked with a help of them.

    The instruments are very convenient, they give an opportunity to identify the worsened condition of contact connectors on HV circuit breakers and of disconnecting switches. They reduce the time for detecting a defect and prevent accidents and technological disturbances. The defects are periodically identified. That fact allows us to schedule a necessary repair work on time and maintain the equipment in a good working condition.

    We recommend these instruments for use in organizations, which operate high-voltage equipment.

    Thank you for your help in solving our production tasks and sincerely hope for further mutually beneficial cooperation.

    S.I.Kandiano
    Acting Chief Engineer-Deputy Director

  • Open Original

    Tver Carriage Building Plant, JSC

    On behalf of the SSD of TVZ, JSC MW in Moscow we would like to express our sincere gratitude and deep appreciation to SKB EP, LLC for providing digital and modern measurement equipment! Since February 2021, our department has been using MIKO-9A milliohmmeter.

    The milliohmmeter is used for diagnostic and detection of turn-to-turn short circuits of traction electric motors and network reactors of electric trains of the EG2Tv "Ivolga" series.

    Due to MIKO-9A compactness and lightness, as well as the presence of a built-in battery and the ability to measure the resistance of the conductor under inductive load, the device can be used in space-limited conditions allowing to detect malfunctions without dismantling the trolleys from the car.

    During MIKO-9A operation, it was possible to identify a malfunction in 3 traction electric motors with a capacity of 300 kW and two network reactors. And these defects could not be determined by the available measurement instruments of our division.

  • Open Original

    KazTransOil, JSC

    1. What device do you use (the number of devices used)? For how long?
    Since June 2019, MIKO-9A device has been used in the amount of 1 piece.

    2. What equipment do you check with the devices manufactured by SKB EP, LLC?
    3-phase power transformers up to 1000 kVA and single-phase transformers of 6-10 kV. Also, high-voltage synchronous and asynchronous electric motors of 10 kV.

    3. How convenient is it to use the device?
    The device is very convenient for working with the tested equipment.

    4. What functions of the device do you consider the best?
    Measurements of the ohmic resistance of the windings of transformers and electric motors.

    5. What problems or malfunctions were detected with the help of the device? On what kind of high-voltage equipment?
    No malfunctions were detected. The device works flawlessly.

    [Manufacturer note]: This question was not understood correctly by the specialists of KazTransOil, JSC.

    6. Specify the economic effect you have received from using the device: the number of detected faulty objects from the entire list of diagnosed equipment, the number of man-hours saved when working with the device compared to using old measurement methods, etc.?
    Working with this device speeds up the work on checking and testing the equipment. The measurement is performed faster, probably 5 (five) times, compared to analog devices.

    7. Can you recommend our devices to other organizations?
    I already recommend them to colleagues from other regions of Kazakhstan.

  • Open Original

    Taksimovskaya distance of power supply the branch of Russian Railways

    MIKO-9A milli-ohmmeter manufactured by SKB EP, LLC is operated in the Taksimovskaya distance of power supply. During use, the device has proven itself on the positive side. The main advantage of MIKO-9A is high measurement speed that significantly reduced the overall test time compared to the previously used device DC bridge R4833. The following equipment was checked using MIKO-9A: voltage transformers ZNOM 27.5 kV, ZNOM 35 kV, power transformers TMG-25/6/10, OSGZ-1-25/27.5, TSZKU-400/10, TMZH-100/27.5, TM-630/10, autotransformers, and current limiting reactors.

    With the help of the device were detected the following malfunctions of the diagnosed equipment: the ohmic resistance of the windings - a difference of more than 100% on the equipment TMG-25/6/10, OSGZ-1-25/27.5, TM-630/10, circuit break of the OCTC position on the equipment TMG-25/6/10, TM-630/10.

    I would like to recommend MIKO-9A to other organizations.

  • Open Original

    Central Power Networks the branch of Yakutskenergo, PJSC

    The service of isolation, overvoltage protection and measurements of Central Power Networks of Yakutskenergo, PJSC currently uses 4 measurement devices manufactured by SKB EP, LLC:

    • MIKO-1 - 3 pcs.;
    • MIKO-9A - 1 pc.

    MIKO-1 device has been actively operated since 2012 to measure contact resistance of high-voltage circuit breakers, disconnectors, separators, and other electrical equipment of switchgears. The device is easy to use, has a small weight and dimensions. Due to the reliable contact and cable connections measurement accuracy of the data obtained is high. Furthermore, the device is equipped with a convenient bag. During operation, the device has proven itself as a simple, unpretentious to use, but quite an accurate device.

    MIKO-9A device has proven itself perfectly (it has been in operation since 2019) when working on measuring DC resistance of power and measurement transformers. Among the main advantages of the device, we would like to point out the following:

    • Possibility of simultaneous measurement by 3 phases;
    • Reliable contact and cable connections;
    • High accuracy and speed of the measurements;
    • The ability to compare the data obtained with the factory data directly during the measurement process;
    • Large battery capacity, choice of operation from mains or battery;
    • Compactness, light weight, easy-to-use interface.

    Devices manufactured by SKB EP, LLC have definitely proven themselves on the positive side, no malfunctions were found in their work. These devices can be recommended to the enterprises engaged in the repair, operation and diagnostics of high-voltage equipment.

  • Open Original

    Hevel Kazakhstan, LLP

    The main advantages of the MIKO-9 instrument in comparison with the traditional ohmic resistance measurements method by the voltmeter-ammeter method are the ease of use and the absence of errors when assembling the measuring circuit. Low weight, compactness, the absence of movable and fragile parts in the instrument simplifies the requirements for transportation by transport or manually on the solar power plant.

    MIKO-21 is multifunctional and easy to use, has a convenient menu. I liked a wide range of manually set values of the measuring current and the ability to transfer the measurement results to a computer. I would also like to mention the color touch screen, the nominal values archive of the controlled equipment, autonomous power supply and dimensions.The instrument worked well during operation, there were no failures. The instruments did well while working on different types of SPP power equipment (from 0.8 kV and 20 kV.

    Fursaev A.A.
    Director

  • Open Original

    PremierStroyDesign, JSC

    The instrument MIKO-9A is operated at the moment in the electrical measurement laboratory of PremierStroyDesign, JSC.

    The full package of documents included in the instrument standard complete set allowed us to master the instrument functionality without problems. It is also worth mentioning that we contacted the company SKB EP, LLC when had faced the instrument activation and specialists immediately got in touch and solved all issues. We express a special gratitude for that.

    During the operation of MIKO-9A instrument since November 2020, no serious drawbacks and low-quality components were identified, which would make impossible the use of the instrument or would prevent any works.

    The main advantages of MIKO-9A instrument are compact size, the ease of transportation. For field work it is the quickness of equipment deployment (workplace). An important thing is the ease of control of the instrument and the digital indication of measurement result. The instrument is equipped with a built-in battery, which allows us to make measurements even in field conditions.

    The operation of MIKO-9A has significantly reduced the time for diagnostic of the following equipment: power transformers 10/0.4 kV 35/10 kV, power equipment of substations 10/0.4 kV 35/10 kV, busbar bridges 0.4 kV 10kV 35 kV, electric motors of all capacities and many other equipment, as the range of instrument functions is large.

    PremierStroyDesign, JSC thanks SKB EP, LLC for the manufacture of high-quality instruments and for the interest shown in the operation of its products. We hope for new developments and equipment which will interest the specialists of electrical measurement laboratory.

    A.A.Poliy
    Head of the electrical measurement laboratory

  • Open Original

    Primorskaya GRES, LLC

    The electrical laboratory department of Primorskaya GRES, LLC has been used milli-ohmmeter MIKO-9A for the electrical equipment diagnostic since 2021.

    With a help of the instrument we measure the ohmic resistance of windings in transformers and autotransformers with a voltage up to 500 kV and a power up to 250,000 kVA, electric motors of various power with a voltage up to 6 kV. Moreover, we demagnetize the magnetic system of transformers, measure the transient resistance of contacts and bolted joints.

    The instrument is convenient due to its low weight and small size. A manipulating rod with special cables was purchased together with the instrument. In many cases, the use of the manipulating rod allows you to get rid of an autolift.

    The managers of Primorskaya GRES, LLC thanks SKB EP, LLC for manufacturing the necessary instrument for enterprise and hopes for the emergence of new developments. We recommend to other companies showing interest in the instruments produced by your company.

    E.S. Antovshchuk
    Chief Engineer

  • Open Original

    Udokan copper, LLC

    Nowadays, specialists of an electrical laboratory of Udokan copper, LLC operate the following instruments, which are manufactured by SKB EP, LLC: MIKO-9A, MIKO-21 and PKV/M7.

    These instruments have been used since 2020 when conducting a comprehensive diagnostic of power and measuring transformers, high-voltage circuit breakers and disconnectors.

    We would like to note the universality of MIKO-21, extensive functionality when measuring parameters on electrical installations of 4-220 kV: for example, measuring the contact resistance of metallic bounding equipment with an earthing system, measuring the contact resistance of a contact system of circuit breakers with a voltage class of 6-10 -35-220 kV, measuring the contact resistance of bolted joints of 4-220 kV. Speaking about a specified functionality of the instrument, advantages are revealed both in terms of the cost (instead of several instruments we use one) and in terms of labor costs reducing for carrying out work.

    While using MIKO-9A, the following advantages were found: the ability to measure contact resistances of circuit breakers contact system 6-220 kV, measure the ohmic resistance of windings of power and measuring transformers of 6-220 kV with an AUTO 3Ph mode. These advantages can significantly reduce the time for preparing and performing measurements in comparison with instruments of previous generations and produced by other manufacturers.

    The instrument PKV/M7 is a reliable device for measuring parameters of circuit breaker VEB-UETM-220 of 10-35 kV manufactured by Elmash, LLC from Yekaterinburg.

    Having gained experience in the operation of instruments manufactured by SKB EP, LLC, we can confidently recommend these products for conducting a comprehensive diagnostic of power equipment.

    A.V. Sevostyanov
    Chief power engineer

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