Modern milliohmmeter 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 μOhm ÷ 30 kOhm

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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 OLTC‘s (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, touch display, remote control and bluetooth data transfer

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The MIKO-9A milliometer is developed to measure DC resistance in the range from 1 µOhm ÷ 30 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 circuit;
  • Equalizing, current limiting and other resistors of high-voltage circuit bre­akers;
  • Сables.

The device provides a fully automated process of measuring the resistance of a high inductive load and compensation of thermoelectric power in the external circuit.

MIKO-9 implements specialized measurement modes for various configurations of 10 objects (resistive object, inductive, voltage transformer, current transformer and power transformer, generator, motor, compensator, connection filter and magnet), taking into account their specific features.

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

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

Depending on the type of object, 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 the three phases of the transformer and take measurements with automatic switching between them.This mode allows you to reduce the number of ascents and descents from the object.

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 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.  

Depending on the type of object, 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.

The resistance measurement mode simultaneously on two windings guarantees a quick and reliable measurement of the electrical resistance of heavy power transformers, in particular, with the connection of the secondary windings into a triangle, 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 measurements from 6 to 3.

Demagnetization mode is designed to eliminate the rem- nant magnetism of the transformer magnetic core. It is compulsory 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 demagnetizntion.

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

OLTC in-place 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 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 the opening of fault-free OLTCs. Milliohmmeter 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 R (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.

Berofe the start of the measurement process the User has to specify winding, phase, max measurement dura- tion, frequency of measurement results saving, winding R and t° under normal conditions. Correlation between the winding t° 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 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.

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

  • Auto δ calculation of Rphase between one another.
  • Auto conversion of Rlinear to Rphase. Linear windings are Delta or Star/Wye (with no neutral) connected.
  • Auto correction of R measured at to R at t°p.
  • Auto δ calculation between Rcorrected and Rp.
  • Auto calculation of by its R.

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 measuring current;
  • emf of self-induction;
  • overheat of the test block..

At disconnection of the measuring 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 measuring cable or power cable protecting users from electric shock and the instrument from being damaged.

The instrument can be powered from the mains (110÷220, 330V) - model MIKO-9 - or from an built-in battery - MIKO-9A.

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)
Measuring current intensity, А 0.0005 ÷ 10
Amperage measurement range in the DRM mode, A 0.1 ÷ 10
The number of digits on the output of the measurement result 5
Power supply (built-in battery) MIKO-9A Li-ion battery
MIKO-8MA: Battery charge time, hour 3
MIKO-8MA: Duration of continuous operation of the battery, hours 8
Built-in memory up to 1000 measurements
Type of data transmission channel USB, RS-485 and Bluetooth
Display Color graphic TFT touch, 800 x 480 pixels
Maximum consumed power, W 120
Maximum output capacity, W 60
Power supply (mains voltage) MIKO-9 / MIKO-9A AC 90-253V, 47-63Hz, DC 127-354V
Dimensions, mm 270х250х130
Maximum measuring unit weight, kg 4.0
Operating temperature range, ºС -20 ÷ +55
IP rating in operating state IP40
IP for transportation IP67
Interface and user's manual language English
Testing period, year 3
Calibration period, year 3
Warranty period, year 3

Standard complete set

Photo Item, Index Application
MIKO-9 measuring unit
  • MIKO-9 measuring unit
  • SKB041.00.000-01
  • MIKO-9 measuring unit
  • SKB041.00.000-01

Instrument and covering documents: Calibration Certificate, User's Manual, and a Log Book.

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

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).

Mains cable
  • Mains cable
  • SKB018.09.00.000
  • Mains cable
  • SKB018.09.00.000

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
  • SKB010.01.00.000
  • Ground cable
  • SKB010.01.00.000

Ground cable 1 x 2.24 m. Weight 0.08 kg.
For instrument grounding. Terminated with a G-clamp and a lug for a screw. Rated current is 50A.

Zero resistance equivalent
  • Zero resistance equivalent
  • SKB023.15.00.000
  • Zero resistance equivalent
  • SKB023.15.00.000

Resistance zero point accuracy check. Value – 0.000 µOhm.

Shunt 75ShSM M3 (75ШСМ М3)
  • Shunt 75ShSM M3 (75ШСМ М3)
  • Shunt 75ShSM M3 (75ШСМ М3)

Performance check. Value – 1 µΩ ± 0.5%.

VP2B-1V-2А cut-out (2 pcs.)
  • VP2B-1V-2А cut-out (2 pcs.)
  • VP2B-1V-2А cut-out (2 pcs.)

For power source protection.

Attachment devices set kit
  • Attachment devices set kit
  • SKB126.06.02.000
  • Attachment devices set kit
  • SKB126.06.02.000

Additional complete set (on order)

Photo Item, Index Application
Test cable<br>(set of 2 pcs.)
  • Test cable
    (set of 2 pcs.)
  • SKB041.18.00.000
    SKB041.18.00.000-01
  • Test cable
    (set of 2 pcs.)
  • SKB041.18.00.000
    SKB041.18.00.000-01

Current cables 2 x 8.5 m with crocodile clips (jaw up to 80 mm) for connection to transformer leads. 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.)
  • SKB041.22.00.000
    SKB041.22.00.000-01
  • Test cable
    (set of 2 pcs.)
  • SKB041.22.00.000
    SKB041.22.00.000-01

Current cables 2 x 8.5 m with crocodile clips (jaw up to 80 mm) for connection to transformer leads. Modification of the SKB041.18.00.000(-01) cable. To be used on transformers with leads 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
  • Test cable
  • SKB041.19.00.000
  • Test cable
  • SKB041.19.00.000

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

Test cable<br>(set of 2 pcs.)
  • Test cable
    (set of 2 pcs.)
  • SKB041.26.00.000
    SKB041.26.00.000-01
  • Test cable
    (set of 2 pcs.)
  • SKB041.26.00.000
    SKB041.26.00.000-01

Current cables 2 x 8.5 m with a G-clamp (jaw up to 103 mm) for connection to transformer leads. Set weight 4.42 kg (2.2 kg + 2.22 kg).
Alternative version of measuring cable SKB041.18.00.000 and СКБ041.18.00.000-01.

Test cables for CT and VT
  • Test cables for CT and VT
  • SKB041.21.00.000
  • Test cables for CT and VT
  • SKB041.21.00.000

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.
Capable for in-built and stand-alone transformers / circuit-breaker.

Test cable extension (set of 2 pcs.)
  • Test cable extension (set of 2 pcs.)
  • SKB031.20.00.000
  • Test cable extension (set of 2 pcs.)
  • SKB031.20.00.000

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 measuring cables SKB041.18.00.000/SKB041.18.00.000-01 (jaw up to 80 mm) and SKB041.26.00.000/SKB041.26.00.000-01 (jaw up to 103 mm).

Short-circuiting cable (set of 3 pcs.)
  • Short-circuiting cable (set of 3 pcs.)
  • SKB041.23.00.000
  • Short-circuiting cable (set of 3 pcs.)
  • SKB041.23.00.000

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).

The set is used for applying the DRM-test by closing secondary circuits. This cable is for OLTC of power transformers.
Furthermore, this cable is needed for connecting the high-voltage and low-voltage windings when performing measurements in the ‘two consecutive windings’ mode.

Short-circuiting cable (set of 3 pcs.)
  • Short-circuiting cable (set of 3 pcs.)
  • SKB035.31.00.000
  • Short-circuiting cable (set of 3 pcs.)
  • SKB035.31.00.000

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).

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

Additional resistor
  • Additional resistor
  • SKB032.25.00.000
  • Additional resistor
  • SKB032.25.00.000

For in-place OLTCs monitoring at apparent resistance of the winding of no more than 0.5 Ohm.
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.

Reference inductor adaptor
  • Reference inductor adaptor
  • SKB023.12.00.000
  • Reference inductor adaptor
  • SKB023.12.00.000

For testing laboratories: inspection / calibration of the instrument.
Length 0,025 m + 0,16 m. Weight 0,04 kg.

Tool bag
  • Tool bag
  • SKB126.10.00.000
  • Tool bag
  • SKB126.10.00.000

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

Manipulating rod
  • Manipulating rod
  • SKB010.41.00.000
    SKB010.41.00.000-01
    SKB010.41.00.000-02
  • Manipulating rod
  • SKB010.41.00.000
    SKB010.41.00.000-01
    SKB010.41.00.000-02

The rod is designed to ensure convenient connection to contacts of a transformer inputs.

The rod is completed with a clamp with current and potential contacts connected by wires with the measurement platform. Test cables are connected to the measurement platform from the ground.

  • Open Original

    Mysovskaya distance of power supply branch of Russian Railways

    In 2019, we purchased and accepted for continuous using MIKO-2.3 micromillikilohmmeter and MIKO-9A milliometer, manufactured by SKB EP. The instruments are used in the process of servicing high-voltage equipment 220 - 6 kV - power, step-down and measuring transformers, high-voltage circuit breakers, disconnectors, separators and short-circuits, contact joints of busbars and connecting buses, cable lines. MIKO-2.3 and MIKO-9A came to replace obsolete AC and DC bridges.

    During the operation, the personnel of our company have repeatedly noted the positive aspects of the devices: ease of use, wide scope and accuracy. Considering the peculiarities of our enterprise’s territorial location (7 traction substations of 110 —220 kV with a total capacity of 780 MVA, 4 transformer substations of 35 kV, more than 350 complete transformer substations of 6 — 27.5 kV, in an area of ​​over 300 km) it is worth noting the convenience of devices when using in the role of a compact laboratory, allowing to replace a large number of devices and measuring instruments of the repair and revision team, without loss in quality and completeness of the complex of technological operations.  We would also like to draw attention to the simplicity of data processing after performing tests and measurements.

    MIKO-2.3 and MIKO-9A instruments allow timely and accurate detection of developing equipment defects, which in turn reduces the risk of emergencies, violations and malfunctions of technical equipment. Excessive costs for equipment and diagnostic tools, significantly reduced the cost of metrological support and repair.

    The management and personnel of the Mysovskaya distance of power supply, recommends the use of MIKO-2.3 and MIKO-9A instruments manufactured by SKB EP for organizations that perform maintenance of high voltage electrical equipment. This is one of the best market solutions.
  • Open Original

    Tayshetskaya distance of power supply branch of Russian Railways

    In 2018, our company purchased the MIKO-9A device. In this instrument, our employees like the versatility of the device and its size. Сarrying bag, in which you can fold all the cables and the necessary tools, is very convenient. Among the features of the device, we highlight the high accuracy of measurements with the ability to save results. Pleased with the high autonomy of the device, the battery lasts for several dozen measurements.

    During the use of the device, failures in its operation were not detected.

    Considering the above, we can recommend MIKO-9A for various laboratories (mobile and stationary) and we allow the use of feedback for advertising purposes.

  • Open Original

    Engineering Center EnergoRazvitie, LLC

    EnergoRazvitie Engineering Center, LLC reports that the MIKO-9A, PKR-2M, MIKO-2.3, PKV/M7 instruments operated by our organization, manufactured and delivered by your enterprise, meet the requirements for them. The equipment and functionality of the devices are provided in accordance with the order.

    The MIKO-2.3 instrument and the control instrument for high-voltage circuit breakers PKV/M7 are actively used by our organization in measuring the contact resistance of contacts of high-voltage circuit breakers, disconnectors and other electrical equipment, as well as for monitoring the characteristics of oil, vacuum and gas-insulated circuit breakers. 

    These devices have a number of positive advantages:

    • informative, accurate in measurements; 
    • easy to use; 
    • reliable and compact.
    The MIKO-9A instrument is used to test power transformers. The device is equipped with a wide range of test leads, it is possible to measure in a three-phase scheme, which makes it possible to quickly perform a large number of measurements with a minimum of specialists, reducing the number of connection operations. The presence of a built-in high-capacity battery allows measurements in the field, regardless of the availability of the mains. The instrument has small weight and size parameters, and is also very convenient to use due to the presence of the following functions:

    • automatic operation mode;
    • demagnetization of the transformer;
    • convenient and intuitive interface.

    The PKR-2M instrument is used to check the technical condition of all types of on-load tap-changers, both resistor and reactor ones. The device allows you to check the status of the on-load tap-changer using both collapsible and CIP methods. For example, to diagnose on-load tap-changers with current-limiting resistors, it is not necessary to remove the contactor tank cap (DRM method).

    The presence of a built-in battery increases its mobility and ease of use. Equipped with long probes and a cable with crocodile clamps, it makes it easy to connect to most on-load tap-changers.

    The use of the above instruments allows our specialists to reduce the time of testing and measurement. These devices proved to be positive to use, correspond to the declared characteristics and surpass in many aspects similar devices from other manufacturers.

    IC EnergoRazvitie LLC expresses its gratitude for your work invested in the released devices and looks forward to further fruitful cooperation.

  • Open Original

    Sakhalin Energy Investment Company Ltd.

    Sakhalin Energy Investment Company Ltd. (hereinafter - the Company) informs that the MIKO-9A instrument operated by our organization, manufactured and delivered by your enterprise, meets the requirements for it. Special equipment and functionality are provided in accordance with the order. 

    Although the operating experience of the device is relatively small (since June 2019), at the moment it seems possible to note a number of positive comments on the effectiveness of its use:

    • Compactness and lightness;
    • A wide range of test leads and probes;
    • The presence of power from the network and from the built-in battery.

    For example, in the field, there is no need to organize the device’s power supply from the network, and when the battery is discharged, it is possible to connect the mains power and continue the measurement without waiting for the battery to charge.

    • Fast saturation of windings when measuring objects with high inductance (powerful power transformers, synchronous / asynchronous machines);
    • The large capacity of the built-in battery allows you to perform a large number of measurements without recharging it;
    • There are manual and automatic measurement modes, which allows you to choose the necessary functional settings.

    For example, it is very convenient to measure the transition resistance of contacts (including the ground loop) in automatic mode using needle probes with spring-loaded contacts, since the device starts to measure automatically after connecting the probes to the measurement object, which makes it possible to quickly perform a large number of routine and similar measurements and does not require the involvement of two people.

    • In the kit for the device there is a calibration shunt and an element of zero resistance, which allows you to quickly monitor the performance of the instrument in the field;
    • In the measurement options there are options for the demagnetization of the transformer and in-place on-load tap-changer diagnostics using the DRM method;
    • The demagnetization option of the transformer has already proven its effectiveness - the inrush of the magnetization current has been reduced to a safe value;
    • The device interface is intuitive and understandable;
    • Instructions for use of the device are itemized and detailed (there is no need to contact technical support on any issues related to its setup and use)
    The advantages of this instrument, as indicated above, allow you to maximize the efficiency and quality of measurements in the field with minimal human resources.

    Sakhalin Energy Investment Company Ltd. hopes for further fruitful cooperation.

  • Open Original

    PJSC T Plus Sverdlovsk branch of "Novo-Sverdlovsk CHP"

    On October 21, 2019, SKB Electrotechnical Instrument Making LLC, in a classroom at the Novo-Sverdlovsk Thermal Power Plant, conducted a demonstration and demonstration measurements for MIKO and PKV instruments to employees of the electrotechnical laboratories of several stations of the PJSC T Plus Sverdlovsk branch of "Novo-Sverdlovsk CHP.

    The measurements were performed on the VGM-20 circuit breaker in conjunction with representatives of SKB EP: Konstantin Muravin, Gennady Kurov, Natalia Korneeva. The following devices were demonstrated: the MIKO-21 microohmmeter (transition resistance of the contacts was measured) and the control device for the high-voltage circuit breakers PKV / M7 (the characteristics of the stroke, speed, time, and also the timing of the contacts were taken).

    On 6 kV 5DV-A motors, designed to measure the active resistance of DC windings, the operation of millimeters MIKO-7M (A) and MIKO-9A have been shown.

    Instruments have proven themselves on the good side in terms of operation and accuracy, as well as measurement speed. We recommend them for purchase and operation.

  • Open Original

    Korshunikha-Angarskaya DES branch of Russian Railways

    We inform you that in the Korshunikha-Angarsk distance of power supply, the MIKO-9A device arrived in the 4th quarter of 2018, and was distributed in the repair and inspection section.

    The MIKO-9A instrument is used by our company to check power transformers and other transformers (type ZNOM-35). The device is very convenient to use, it is small-sized and light in weight.

    The number of man-hours when working with the device decreased by three times, compared with the use of old methods of measurement.

    We recommend that other organizations use the MIKO-9A deinstrument, which is a modern and very convenient device for checking electrical equipment.

  • Open Original

    Ulan-Ude DES branch of Russian Railways

    Since 2019, in the Ulan-Ude distance of power supply, a millimeter of MIKO-9A manufactured by SKB Electrotechnical Instrument Making LLC has been used. The MIKO-9A device is used to measure the resistance of the windings of oil and dry transformers from 0.4 to 220 kV of various types and designs.

    The following advantages of this device can be distinguished:

    • convenient in operation and transportation due to the small size;
    • wide range of measurements fast measurement process, due to the possibility of measuring resistance across two windings;
    • automatic calculations due to the archive of measurements.

    During operation, no flaws were detected, the device works flawlessly.

  • Open Original

    Engineering Center EnergoRazvitie, LLC

    EnergoRazvitie Engineering Center, LLC reports that the MIKO-9A, PKR-2M, MIKO-2.3, PKV/M7 instruments operated by our organization, manufactured and delivered by your enterprise, meet the requirements for them. The equipment and functionality of the devices are provided in accordance with the order.

    The MIKO-2.3 instrument and the control instrument for high-voltage circuit breakers PKV/M7 are actively used by our organization in measuring the contact resistance of contacts of high-voltage circuit breakersIn particular, gas-insulated core circuit breakers of the ELF type SP7-2 at 500 kV manufactured by ABB. MIKO-2.3 is convenient to use due to its small size. The current generated by the device allows you to burn through the contact and get stable readings of the transition resistance. The advantage of the device is also the combination of potential and current circuits in two terminals and taking into account the own resistance of the wires included in the kit. In general, MIKO-2.3 allows you to reduce the measurement time and get stable and reliable results. However, it is worth paying attention to the fast discharge of the battery when using a microohmmeter, which determines the dependence of the instrument on the availability of the mains. Test leads for 500 kV circuit breakers must be of a minimum length of 10 meters with reliable and convenient clamps for connection, and this requires additional specification of the order.

    Circuit breaker analyzer PKV/M7 is simple and convenient to operate, it allows you to control the main characteristics of high-voltage switching devices. The positive thing is that in one measurement cycle the device allows you to measure several parameters, which significantly reduces the processing time and assess the technical condition of the circuit breaker. A small number of contact cables and the use of different instrument connectors make it possible to reduce the likelihood of personnel errors when assembling the test circuit. PKV/M7 is a universal device that allows you to control the parameters of high-voltage circuit breakers, and can be safely recommended to organizations involved in the commissioning and operation of high-voltage equipment.

    The MIKO-9A instrument is used to test power transformers and autotransformers. In particular, in May 2020, the device was successfully tested on the ATDCTN-250000/220/110 autotransformer. MIKO-9A is equipped with a wide range of test leads, (it is possible to measure three-phase circuit), which makes it possible to quickly perform a large number of measurements, reducing connection operations, with a minimum of specialists.

    The presence of a built-in high-capacity battery allows measurements in the field, regardless of the availability of the mains. The device is very convenient to use (the presence of automatic mode, an important demagnetization option for the transformer, a convenient and intuitive interface), is small and lightweight.

    The PKR-2M instrument is used to check the technical condition of switching devices of transformers of all types, both resistor and reactor, using the collapsible method, as well as for diagnosing on-load tap-changers with current-limiting resistors without removing the contactor tank cap. The presence of a built-in battery increases its mobility and ease of use. Equipped with long probes (optional) and a cable with crocodile clamps, it makes it easy to connect to most on-load tap-changers.

    The use of these instruments allows our specialists to reduce the time of testing and measurement. These devices these devices are good to use, correspond to the declared characteristics and surpass in many aspects similar devices from other manufacturers.

  • Open Original

    Capital-Stroy Diagnostics, LLC

    Review to PKV/M7 circuit breaker analyzer
    In 2019, our company purchased PKV/M7 device. After studying the User Manual that is competently compiled by the specialists of SKB EP, LLC, the engineers of Capital-Stroy Diagnostics, LLC started to run measurements on 110 kV circuit breakers. It is worth noting that VGT-110 SF6 circuit breakers have different design features depending on the manufacturer, however, this was not reflected in the measurement circuit assembly instructions.

    PKV/M7 device has shown its best. It provides enough information to determine the technical condition of the circuit breakers, has a convenient interface and is easy to operate.

    In particular, we would like to note the good work of the technical support service of SKB EP, LLC that promptly helps to deal with issues that might arose.

    We recommend PKV/M7 device to the companies that are involved in operating and diagnostics of high-voltage circuit breakers.

    Review to MIKO-9A milliohmmeter
    In 2019, our company purchased MIKO-9A device to measure ohm resistances of 110 kV power transformers. After studying the device documentation and carrying out reference measurements (reference resistance is included into device complete set) engineers of Capital-Stroy Diagnostics, LLC started working with MIKO-9A milliohmmeter. Significant advantages and minor disadvantages were revealed while working with MIKO-9A on 110 kV power transformers, in comparison with other similar devices.

    Among the advantages, it is worth noting high accuracy of the measurements, large battery capacity, and most importantly, transformer demagnetization function. This feature reduces the time spent on measurements and reduces bulky equipment amount that we had to use previously. User-friendly interface, an ability to connect the cables to all three phases simultaneously, and an ability to run measurements with an automatic switch between the windings by the device itself significantly reduce total operating time and simplify the measurement process.

    One of the disadvantages is a long time of windings saturation, despite 10 Amps test current that is supplied to the windings by the device. With each tap switch of the OLTC the device saturates the winding for quite a long time.

    [Manufacturer comment]: To check winding resistance of the power transformer with an OLTC it is highly recommended to use Manual measurement mode.
    Before measurement start you have to set OLTC to the first or to the last tap, and then start the measurement. Device will magnetize the winding and show resistance value. Then, without measurement stop, you need to switch OLTC to the next tap, and the device will almost immediately display the next resistance value. You must also indicate on the device display that this is the next tap. This method will significantly reduce total measurement time. After resistance measurement on all phases and taps, it is necessary to save the results. All values will be displayed in the archive of this object.

    We recommend MIKO-9A milliohmmeter to the companies that are engaged in the operation, repair and diagnostics of electrical equipment.

  • Open Original

    STC Energoautomatization, LLC

    Our company has been working with MIKO-9A ohmmeter since 2018. At the moment, we use it to measure winding resistance of various equipment (engines and motors, reactors, generators, etc.). During this time, a number of advantages have been identified:

    1. Ability to work both from the battery and from the network (without waiting for a full in-built battery charge);
    2. Automatic measurement stop;
    3. Possibility of measurement on three phases simultaneously.

    Unfortunately, the standard test cable length is not always enough, when measuring high equipment.

    [Manufacturer note]: You could familiarize yourself with specification and technical parameters (including cable length) of each test cable on SKB EP website on MIKO-9A page in the Complete set section. If you know what objects will be measured, you are able to calculate the required length of test cables. Usually, to measure large transformers and other objects for that the cable length of 8.5 m may not be enough, we recommend to use extension cable (item code: SKB031.20.00.000) with a length of 6.5 m. Thus the total length of the test cable increases to 15 m.

    And also in order to form a complete and correct purchase, it would be appropriate to initially complete the device with a tool bag and a set of additional cables for power transformers diagnostics.

    [Manufacturer note]: First of all, we would like to note that no cable is purposefully included to the standard complete set of MIKO-7M(A), MIKO-8M(A) or MIKO-9A milliohmmeters. Users can independently choose exactly the cable that meets the requirements of the object (cable length, jaw width, clamping method). Thus, there is no need to overpay for "unnecessary" cables.

    We would like to recommend MIKO-9A milliohmmeter for resistance measurement of high-power engines and motors.

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