Micromillikilloohmmeter MIKO-2.3

Certificates

  • Safety Test Certificate IEC 61010-1:2001
  • Russian State Register Certificates
  • Declaration of Conformity of the Customs Union
  • Russian Register of Innovative Products

Operates in 4 modes: microohmmeter, milliohmmeter, kiloohmmeter and thermometer

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Multipurpose instrument that performs all tasks regarding resistance measurement in high-voltage equipment

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Microohmmeter mode: contact resistance measurement at max current of 1,000 А in the range 0,1 μΩ ÷ 0,1 Ω

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Milliohmmeter mode: winding resistance measurement within the range 0.1 mΩ - 10 mΩ

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Kiloohmmeter mode: resitance measurement within the range 0.1 kΩ - 3*10 kΩ

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Thermometer mode: measurement of temperatures of windings, oil and air within the range -20°C to +120°C

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Automatic self-tuning for the measurement object

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Self-contained power supply, small dimensions and weight

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Test cables of unique and ergonomic design

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MIKO-2.3 is a portable mini-laboratory allowing performing of all tasks connected with resistance measurement in electrical equipment as this instrument operates in four modes: microohmmeter, milliohmmeter, kiloohmmeter and thermometer.

All types of electrical equipment (transformers, electrical machines and electrical switching devices) require different means for full-rate diagnostics. However in case of direct-current resistance measurement the multipurpose instrument MIKO-2.3 can be used.

Resistance range for the above listed equipment is wide and resides within the values from 10-3 to 600А and more.

For monitoring of a transformer or a sole circuit-breaker, for instance, a microohmmeter, milliohmmeter, thermometer and even kiloohmeter are needed. It means that you have to use three or even four instruments one at a time which is not usually convenient. Increasing of the number of instruments increases not only the total cost of a set, but also its weight which complicates transportation of equipment to remote facilities.

Microohmmeter mode is designed for measuring transfer resistances of any switching devices as well as collapsible and non-collapsible contact connections in the range within 1 µOhm  ÷ 105 µOhm

In addition, this mode allows you to take into account the presence or abse­nce of a current transformer in the measured circuit: 

  • sub-mode "CT-no";
  • sub-mode "CT-yes";
  • sub-mode "CT-yes, Tmax".
But the main requirements for microohmmeters are to provide a rather large operating current, which is able to burn through oxidized films. They are formed on the contacts and give a significant inaccurancy in the measurement of resistance.

MIKO-2.3 surpasses all foreign and domestic microohmmeters. The closest microohmmeter in terms of characteristics at a current of up to 500 A has a mass of 7.5 kg and mains charge. MIKO-2.3 with a mass of only 2.7 kg gives a current of up to 1000 A, and also runs on a capacitor bank.

In the microohmmeter mode, the device has an archive for saving 62 results with the values ​​of the measured resistance. Archive is designed to store, view, delete measurement results, as well as to transfer them to a PC.

To transfer data to a PC and maintain a measurement archive, an RS-232 cable, a special adapter (optional) and the MIKO measurement archive program are used.

Milliohmmeter mode is designed for measurement of direct-current resistance in circuits with high inductance (transformers, electromagnets etc.) within the range of 0.1 mOhm-106 mOhm.

Two submodes are used here: measurement of one-phase and three-phase windings. Besides, MIKO-2.3 has a function of automatic recalculation of resistance measurement results for a three-phase winding:

  • calculation of relative deviations of resistance values of moving coils between each other;
  • recalculation of resistance values of moving coils connected according to the triangle scheme into resistance values of phase windings;
  • recalculation of resistance values of moving coils connected according to the star scheme into resistance values of phase windings;
  • recalculation of a winding resistance measured at current temperature T into resistance at base temperature Ɵ with due account for the winding material.

The appliance has an archive for storage of results of changing the "milliohmmeter" mode that allows for storing and reading 63 results for electrical resistance of one-phase windings and 21 result for three-phase windings.

A special program by the manufacturer is used for transmission of data to a computer and for keeping archive records of measurements on a PC.

Kiloohmmeter mode is designed for measurement of resistance of potential dividers, ballast, closing and other resistors in terms of considerable interference and induced voltage within the range of 0.1 kOhm-3*102 kOhm.
Thermometer mode is designed for measurement of temperatures of windings, oil and air within the range of -20°C to +120°C.

Switching on each of four modes occurs automatically when appropriate input cable from the instrument set is connected.

Versatility and weight of the appliance are especially critical for organizations responsible for facility commissioning that have to constantly carry heavy weights of instruments and equipment for significant distances.

Light weight and self-contained supply (charge time is 3 to 5 min) give an opportunity to use MIKO-2.3 not while standing on ground, but while being on a switch cover or in a cradle scaffold. That is why the length and weight of cables of MIKO-2.3 are significantly lesser, and one can go down and up the equipment only once instead of two times in case of measurement with a ground-based appliance.

MIKO-2.3 instrument is easy to use and maintain, reliable and resistant to electromagnetic field influence.

Specifications Value
"Microohmeter" mode: -
Electric resistance measuring range, µOhm 1 ÷ 100,000
Maximum permissible intrinsic relative error of electric resistance measurement, % ±0.2
Measuring current intensity range during electric resistance measurement in "CT (current transformer)-available" and "CT-not available" submodes, А 10 ÷ 1000
Measuring current intensity range during electric resistance measurement in "CT-available Тmax" submode, А 100 ÷ 400
Maximum time of one measurement in "CT-not available" submode, sec 2
Maximum time of one measurement in "CT-available" submode, sec 30
Maximum time of one measurement in "CT-available Тmax" submode, sec 20
"Milliohmmeter" mode: -
Electric resistance measuring range, mOhm 0.1 ÷ 1,000,000
Maximum permissible intrinsic relative error of electric resistance measurement, % ±0.2
Measuring current intensity range during electric resistance measurement, А 0.5 ÷ 5
One measurement time, sec 10 ÷ 900
"Kiloohmmeter" mode: -
Electric resistance measuring mode, kOhm 0.1 ÷ 300
Maximum permissible intrinsic relative error of electric resistance measurement, % ±0.5
Value of induced voltage across the resistor, kV ≤ 5
Maximum time of one measurement, sec 3
"Thermometer" mode: -
Temperature measuring range, °С -20 ÷ +120
Maximum permissible intrinsic absolute error of temperature measurement, °С ±1.0
Maximum accumulator charge time, min 5
Maximum power consumed in the power circuit, W 60
Operation temperature range, ºС -20 ÷ +40
IP rating in operating state IP20
Maximum measuring unit weight, kg 2.7
Dimensions, mm 150х190х75
Interface and user's manual language English
Testing period, yaer 3
Calibration period, year 3
Warranty period, months 13

Standard complete set

Photo Item, Index Application
MIKO-2.3 measuring unit
  • MIKO-2.3 measuring unit
  • SKB025.01.00.000
  • MIKO-2.3 measuring unit
  • SKB025.01.00.000

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

BC-1A charging device
  • BC-1A charging device
  • SKB023.20.00.000
  • BC-1A charging device
  • SKB023.20.00.000

For battery charging during resistance measurement on electrical equipment.

K162 microohmmeter cable
  • K162 microohmmeter cable
  • SKB023.02.00.000-01
  • K162 microohmmeter cable
  • SKB023.02.00.000-01

Microohmmeter cable 1 x 2.3m + 1.1m with crocodile clips and G-clamps.

For resistance measurement of oil (U-110; MKP-110; VMT-110 types), air (ВВОА-15 type) and gas-insulated high-voltage circuit breakers (VGU-220; VGV-110; ZAR1DT-145; ZNM428; VGBU-110; VGB-330 types). 

Potential spring-loaded contact (2 pcs.)
  • Potential spring-loaded contact (2 pcs.)
  • SKB023.21.00.000/-01
  • Potential spring-loaded contact (2 pcs.)
  • SKB023.21.00.000/-01

For connection to the input pin. Included into the complete set of the K162 measuring cable.

Potential pin contact (2 pcs.)
  • Potential pin contact (2 pcs.)
  • SKB023.22.00.000/-01
  • Potential pin contact (2 pcs.)
  • SKB023.22.00.000/-01

For connection to the input pin. Included into the complete set of the K162 measuring cable.

K233 milliohmmeter cable
  • K233 milliohmmeter cable
  • SKB023.07.00.000-02
  • K233 milliohmmeter cable
  • SKB023.07.00.000-02

Milliohmmeter cable 1 x 6m + 2m with input pin diameter up to 37 mm.

For resistance measurement of power transformer windings with the voltage of 110 kV and less under direct current. 

K322 kiloohmmeter cable
  • K322 kiloohmmeter cable
  • SKB023.06.00.000-01
  • K322 kiloohmmeter cable
  • SKB023.06.00.000-01

Kiloohmmeter cable 1 x 3.4m + 2.1m.

For measurement of multiplier, shunt and dividing resistances in case of presence of induced voltage for them.

Thermometer with K411 cable
  • Thermometer with K411 cable
  • SKB023.08.00.000
  • Thermometer with K411 cable
  • SKB023.08.00.000

Thermometer cable 1 x 1.8m. For temperature measurement of oil, water and air.

Mains cable
  • Mains cable
  • SKB023.16.00.000
  • Mains cable
  • SKB023.16.00.000

Mains cable 1 x 2 m. Weight 0.24 kg.

For charging device connection when placing the instrument on the input of the high-voltage circuit breaker.

RS-232 interface cable
  • RS-232 interface cable
  • SKB023.11.00.000
  • RS-232 interface cable
  • SKB023.11.00.000

Interface cable 1 x 1.5m. For computer connection and data transfer.

Shunt
  • Shunt
  • Shunt

Type: 75ShSM M3 (75ШСМ М3). For functional check in microohmmeter and milliohmmeter modes. 

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

Accuracy check of the zero point on the resistance scale. The value is 0,000 µOhm.

Instrument transportation bag
  • Instrument transportation bag
  • SKB123.02.01.000
  • Instrument transportation bag
  • SKB123.02.01.000

Convenient and durable bag, providing additional mobility during the operation of the device.

Bag for a cable set
  • Bag for a cable set
  • SKB123.02.02.000
  • Bag for a cable set
  • SKB123.02.02.000

Convenient and durable bag for transporting cables and accessories.

Additional complete set (on order)

Photo Item, Index Application
K161 microohmmeter cable
  • K161 microohmmeter cable
  • SKB023.02.00.000
  • K161 microohmmeter cable
  • SKB023.02.00.000

Microohmmeter cable 1 x 0.9m + 0.9m with crocodile clips and G-clamps. Maximum current up to 1000A.

For resistance measurement of oil (all for 6, 10 and 35 kV), air (VBB-10; VVE-35; VVChP-15 types) and gas-insulated high-voltage circuit breakers (VGT-110; ZAR2F1; VGV-35; VGU-110; ZAR1FE; VGT-110; ZNM427.04980; VGB-35 types). 

K163 microohmmeter cable
  • K163 microohmmeter cable
  • SKB023.02.00.000-02
  • K163 microohmmeter cable
  • SKB023.02.00.000-02

Microohmmeter cable 1 x 4.5m + 1m with crocodile clip and G-clamp. Maximum current up to 500A.

For resistance measurement of oil (U-220; MKP-220; VMT-220 types in case of work on a hoist), air (VV-330B; VVBK-110; VVBK-220; VVD-220B; VVS-220B; VVU-110G; VVBM-110B; VVS-110B; VVBK-220 types) and gas-insulated high-voltage circuit breakers (ZAR2F1; VGU-220; VGU-330; VGB-220; ZNM427.07465 types). 

K164 microohmmeter cable
  • K164 microohmmeter cable
  • SKB023.02.00.000-03
  • K164 microohmmeter cable
  • SKB023.02.00.000-03

Microohmmeter cable 1 x 3.8m + 1.7m with crocodile clip and G-clamp. Maximum current up to 500A.

For resistance measurement of oil high-voltage circuit breakers (U-220; MKP-220; VMT-220 types in case of work without a hoist). 

K165 microohmmeter cable
  • K165 microohmmeter cable
  • SKB023.02.00.000-04
  • K165 microohmmeter cable
  • SKB023.02.00.000-04

Microohmmeter cable 1 x 10m + 1m with crocodile clip and G-clamp. Maximum current up to 500A.

For resistance measurement of of air (VNV-330; VV-500B; VVBK-500; VDN-330Б; VNV-330; VNV-500; VVDM-330B types) and gas-insulated high-voltage circuit breakers (VGU-500; VGB-750; VGB-500; VGB-330).

K151 microohmmeter cable
  • K151 microohmmeter cable
  • SKB023.03.00.000
  • K151 microohmmeter cable
  • SKB023.03.00.000

For resistance measurement of
- of oil high-voltage circuit breakers (all for 6, 10 and 35 kV),
- air high-voltage circuit breakers (VBB-10; VVE-35; VVChP-15 types) and
- as-insulated high-voltage circuit breakers (VGT-110; ZAR2F1; VGV-35; VGU-110; ZAR1FE; VGT-110; ZNM427.04980; VGB-35 types).

Lightweight version of the K161 cable.
Cable cross section 24mm2. Current up to 200A. Length 0.9m. + 0.9m.

K152  microohmmeter cable
  • K152 microohmmeter cable
  • SKB023.03.01.000
  • K152 microohmmeter cable
  • SKB023.03.01.000

The cable is intended / recommended for monitoring:
- oil high-voltage circuit breakers (U-110; MKP-110; VMT-110 types),
- air high-voltage circuit breakers (ВВОА-15 type) and
- gas-insulated high-voltage circuit breakers (VGU-220; VGV-110; ZAR1DT-145; ZNM428; VGBU-110; VGB-330 types).

Lightweight version of the K162 cable.
Cable cross section is 24mm2. Current up to 200A. Length is 2.27m. + 1.1m.

K153 microohmmeter cable
  • K153 microohmmeter cable
  • SKB023.03.02.000
  • K153 microohmmeter cable
  • SKB023.03.02.000

For resistance measurement of:
- air high-voltage circuit breakers (VNV-330; VV-500B; VVBK-500; VDN-330Б; VNV-330; VNV-500; VVDM-330B types) and
- gas-insulated high-voltage circuit breakers (VGU-500; VGB-750; VGB-500; VGB-330).

Lightweight version of the K165 cable.
Cable cross section 24mm2. Current up to 200A. Length 5.0m. + 5.0m.

K121 microohmmeter cable with contacts
  • K121 microohmmeter cable with contacts
  • SKB023.09.00.000
  • K121 microohmmeter cable with contacts
  • SKB023.09.00.000

Microohmmeter cable 1 x 1.8m + 1.8m (can be changed on demand) with removable probes and removable small crocodile clips.

To be used along with one of K161 ÷ K165 cables for resistance measurement in any area between crocodile clips and G-clamps connection points. 

K154 microohmmeter cable with contacts
  • K154 microohmmeter cable with contacts
  • SKB023.05.00.000
  • K154 microohmmeter cable with contacts
  • SKB023.05.00.000

Microohmmeter cable 1 x 1.1m + 1.9m with two needle contacts (potential contact is spring-loaded).

Applied in case of impossibility of equipment connection using cables with crocodile clips and G-clamps. For pairwork.

K155 microohmmeter cable
  • K155 microohmmeter cable
  • SKB023.13.00.000
  • K155 microohmmeter cable
  • SKB023.13.00.000

With one needle contact and one crocodile clip. Potential contact is spring loaded.
Length 0.9m. + 2.3m.

K236 milliohmmeter cable
  • K236 milliohmmeter cable
  • SKB023.07.00.000-04
  • K236 milliohmmeter cable
  • SKB023.07.00.000-04

Milliohmmeter cable 1 x 9m + 9m (input pin diameter up to 37 mm).

For resistance measurement of direct current of power transformer windings with the voltage of 110 kV and less. In case MIKO-2.3 is placed on the ground.

K238 milliohmmeter cable
  • K238 milliohmmeter cable
  • SKB023.07.00.000-06
  • K238 milliohmmeter cable
  • SKB023.07.00.000-06

Milliohmmeter cable 1 x 6.5m + 6.5m (input pin diameter up to 37 mm).

For resistance measurement of direct current of power transformer windings with the voltage of 500 kV and less. In case MIKO-2.3 is placed on the transfo

K239 milliohmmeter cable
  • K239 milliohmmeter cable
  • SKB023.25.00.000
  • K239 milliohmmeter cable
  • SKB023.25.00.000

Milliohmmeter cable 1 x 6.5m + 6.5m (input pin diameter up to 80 mm). 

For resistance measurement of direct current of power transformer windings with the voltage of 500 kV and less (the diameter of an input pin is up to 80 mm). In case MIKO-2.3 is placed on the transformer cover.

К240 extension cable
  • К240 extension cable
  • SKB023.24.00.000
  • К240 extension cable
  • SKB023.24.00.000

Extension cable 1 x 8.5m. 

For combined operations with K238 and K239 measuring cables. In case MIKO-2.3 is placed on the ground.

K235 milliohmmeter cable
  • K235 milliohmmeter cable
  • SKB023.23.00.000
  • K235 milliohmmeter cable
  • SKB023.23.00.000

Milliohmmeter cable 1 x 3m.

For resistance measurement on direct current of electric motors, electromagnets, current transformers, etc.

K321 kiloohmmeter cable
  • K321 kiloohmmeter cable
  • SKB023.06.00.000
  • K321 kiloohmmeter cable
  • SKB023.06.00.000

Kiloohmmeter cable 1 x 2.1m + 3.4m.

For measurement of multiplier, shunt and dividing resistances in the presence of induced voltage.

Manipulating rod
  • Manipulating rod
  • SKB110.41.00.000
    SKB110.41.00.000-01
    SKB110.41.00.000-02
  • Manipulating rod
  • SKB110.41.00.000
    SKB110.41.00.000-01
    SKB110.41.00.000-02

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.

Micromillikilloohmmeter MIKO-2.3
  • Open Original

    Uralelektrostroy, LLC

    In 2015, our company purchased MIKO-2.3 micromillikiloohmmeter to replace MIKO-1 microohmmeter. Our employees appreciate functional versatility and overall dimensions of MIKO-2.3 device. The device is equipped with convenient carrying bags to store all the cables and other tools. Of the features of the device, we would like to point out a short duration of operation from one battery charge that is sufficient for 2-5 measurements at a high test current). However, this feature is compensated by battery’s fast charging from the network. MIKO-2.3 can carry out measurements at a wide resistance range and at test currents up to 1000A. During the use of the micromillikiloohmmeter, no malfunctions were detected in its operation.

    Considering the above, we can definitely recommend MIKO-2.3 for various laboratories (mobile and static).

  • 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

    JSC PE Elektroapparat

    For more than ten years, JSC PE Elektroapparat has been operating instruments manufactured by SKB EP. These devices are used both in production and in the process of servicing measuring transformers, switchgear, high-voltage switches, disconnectors.

    PKV/M7, MIKO-1, MIKO-2.3 instruments are an integral attribute in the work of chief engineers of the warranty service.

    The devices of the MIKO group are used to measure the transition resistance of the main electrical circuit of the remote control switches. These tools allow timely, accurate identification of developing defects, reduce the risk of accidents and failures and violations in the operation of high-voltage equipment. Their use allowed to increase the control and quality of diagnostics during commissioning and repair work.

    The PKV/M7 high-voltage circuit breaker monitoring instrument has established itself as the best domestic measuring instrument for monitoring the main parameters of high-voltage circuit breakers during operation.

    The main advantages of PKV/M7, MIKO-1, MIKO-2.3 instruments are:

    • measurement accuracy, simplicity and information content of the measurement process control; 
    • mobility, autonomous power supply from the built-in battery, small dimensions and weight, convenient carrying bag, which allows you to use it in the field; 
    • devices meet the stated requirements
    All this allows you to perform the required number of measurements quickly and accurately with the least effort.

    Considering the above, we confidently recommend these devices for test-services and organizations involved in the production, commissioning, repair and operation of high-voltage equipment.

  • Open Original

    "Krasnoyarsk CHP-3" branch of JSC "Yenisei TGK (TGK-13)"

    The MIKO-2.3 instrument and the PKV/M7 high-voltage control instrument for circuit breakers manufactured by SKB EP LLC have been used at the Krasnoyarsk TPP-3 branch of Yenisei TGK (TGK-13) JSC since 2016 to measure the transition resistance of the contacts of high-voltage switches, disconnectors and other electrical equipment, and also for the characteristics of oil, vacuum and SF6 circuit breakers monitoring.

    These instrument are easy to use, informative, accurate in measurements, reliable, compact. The use of these devices allows us to reduce the time allotted for testing.

    These instruments proved to be positive, correspond to the declared characteristics, and significantly surpass devices of a similar purpose.

  • 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

    OJSC Negusneft

    The MIKO-2.3 instrument was procured in May, 2009. The instrument is being operated in the majority of complex tests of electric equipment of different types. The MIKO-2.3 is operated using all of its capabilities.

    Main advantages of MIKO-2.3 instrument over similar instruments:

    • Small weight;
    • Independent power supply;
    • Short period of battery charging;
    • Universal nature (four functions in one instrument);
    • Friendly man-machine interface;
    • High quality of assembly;
    • Availability of robust connection cables.
  • Open Original

    Branch of FAR EASTERN POWER DISTRIBUTION COMPANY South-Yakut Electric Networks

    MIKO-2.3 instrument was procured by the Company in December 2008 and has been intensively used during different tests of electric equipment.

    The Instrument was used for testing VMPE-10, VMG-133, C-35-M, and MKP-110 circuit breakers (Microohmmeter; Milliohmmeter). The instrument is also used for measuring the DC resistance of transformer windings (Milliohmmeter) and for temperature measurements (Digital Thermometer).

    Milliohmmeter mode is the most convenient function. Range of the instrument’s measurements in this mode allows both circuit breaker testing and measurements of DC resistance of transformer windings.

    Main advantages of the instrument are its multiple functionality, low weight and small size, availability of a robust casing and a convenient bag for transportation, as well as availability of accessories.

    The MIKO-2.3 instrument can be recommended to all the companies dealing with electric equipment testing.

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    OJSC NORILSK-TAIMYR ENERGY COMPANY Teploelektrocentral-3

    MIKO-2.3 instrument has been used by the Company since December 2010. Measurements of DC resistance using this instrument were made on:

    • Power contacts, solenoid coils for VGM-20, MGU-20, VMPEE-10 circuit breakers;
    • Rotor and stator windings of TVF-120, and TVF-63 generators;
    • Stator windings of DAZO2-18-59-10, DAZO-13-67-6M, 2A3M-5000/6000, VAZ-215-89-20, AV-113-4M, and AV-114-6M electric motors;
    • Windings of TCZS-1000, 3NOM-15, NTMI-10, and 2NOM-10 transformers.


    The instrument is rather simple and convenient in operation due to small weight, independent power supply, availability of a bag. The instrument is rather precise; the measurements are accurate and reliable. Availability of a digital thermometer reduces calculation time when measuring active resistances.

    The MIKO-2.3 can be recommended to all the companies dealing with adjustment, maintenance and operation of electric equipment.

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    CJSC ENERGY TECHNOLOGIES

    It is used for measuring the DC resistance of transformer windings, for measuring the transient resistances of high-voltage circuit breakers, and for measuring the resistance of metal bonds.

    MIKO-2.3 is convenient to use owing to its small size, though rapid battery discharge cause some inconveniences as the device is dependent of the availability of a power network. 950A current produced by the instrument burns the contact and produces reliable data on the transient resistance. Advantage of the instrument is ability to combine potential and current circuits in two clamps, and account of proper resistance of wires included into the kit. 

    Milliohmmeter mode has a function of automatic conversion of resistance versus temperature difference at the factory and on site.

    On the whole MIKO-2.3 considerably reduces the time of measurements and produces reliable and accurate results.

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    OJSC RUSSIAN RAILWAYS BRANCH NORTHERN RAILWAY STRUCTURAL SUBDIVISION ELECTROTECHNICAL LABORATORY

    In 2011 the elctrotechnical laboratory performed trial operation of PKR-1 (an instrument for transformer testing), PKV/M7 (an instrument for high-voltage circuit breaker testing), MIKO-2.3 (micromillikiloohmmeter) instruments manufactured by SKB EP. The instruments demonstrated high efficiency and are of great practical value.

    The MIKO-2.3 instrument replaces the whole set of diverse devices for measuring both low (e.g., transient resistances of contacts, DC resistance of transformer windings) and high (e.g., shunt resistances of circuit breakers) resistances. Despite that the instrument is simple in operation, compact and has low weight. Its advantage is ability to be powered both from a battery and from a 220 V network. Rapid saturation of windings during DC resistance measurements drastically reduces the period of measurements.

    PKR-1 device for transformer testing is worth special mentioning. Northern Railways currently has no specialized instruments for LTC diagnosis and for recording the circular diagram, therefore, this equipment is of special value. The instrument is easy to operate, has a friendly interface, is rather compact and convenient for transportation, measurements do not take much time. Defects were detected in six out of nine tested transformers and their presence was confirmed during repair.

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