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

    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.

  • Open Original

    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.

  • Open Original

    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.

  • Open Original

    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.

  • Open Original

    SVERDLOVSKY PLANT OF CURRENT TRANSFORMERS

    Our Company used MIKO-2.3 instruments #18 manufactured in 2009, and #18 manufactured in 2010.

    The instruments are used for measuring the resistance of main switchgears, circuits, of current and power transformers.

    The instruments are rather convenient in operation though length of conductors.

    We failed to use the instrument for measuring the resistance of transformer windings during thermal tests (in the conditions of rapid change in the windings temperature).

    The MIKO-2.3 can be recommended for use by other companies.

  • Open Original

    OGUEP OBLKOMMUNENERGO

    In 2010 OGUEP Oblkommunenergo procured MIKO-1 micro ohmmeter for measuring the transient resistance of high-voltage circuit breaker contacts. It should be noted that capacity of the battery ideally fits the instrument, its charge is sufficient for the whole working day of heavy operation.

    In 2011 we procured the MIKO-2.3 instrument for measuring the ohm resistance of high-voltage transformer windings. The instrument has advantages similar to those of MIKO-1 but capacity of the battery is sometimes insufficient for making measurements on a high-voltage transformer if it cannot be charged on site.

    After positive experience of operating the MIKO instruments, in 2013 we procured five MIKO-8 devices.

    MIKO instruments ideally suit companies that deal with maintenance, adjustment and testing. The instruments have high precision, are simple in operation, compact and have low weight. During operation of MIKO 2-3 and MIKO-8 when measuring the DC resistance the transformer windings are rapidly saturated and, as a result, the time of measurements reduces. Current output by the instrument allows burning the oxide and oil films occurring between contacts thus giving regular records of transient resistance. Another advantage of the instruments is ability to combine potential and current circuits in two terminals and account of proper resistance of wires included into the kit.

  • Open Original

    Branch IRKUTSKENERGO PJSC IRKUTSK HPP

    Specialists of Irkutsk HPP (hydro power plant) have been using the SKB EP instruments for several years. The PKV/M7 instruments were used for measuring time characteristics of moving parts of such circuit breakers as ABB HGI-3 (13.8kV), AREVA HGF-1012 (110kV), SIEMENS 3AP1DT-145 (110kV, 220kV), and 3AP1DT-245 (220kV); the MIKO-2.3 and MIKO-7 instruments are used on electric motors (0.4kV) and the RVR(Z)-20/2000 M-U3, RGNP-110/2000-50UHL1, RDZ-1-110-2000UHL1, and RNDZ-220/2000U1 (13.8/110/220kV) disconnecting devices.

    The PKV/M7 instrument meets all our needs in HV circuit breaker diagnosis. It provides convenient control of poles time difference using the PC software that shows defects in a circuit breaker long before they may cause a heavy failure.

    The MIKO-2.3 milliohmmeter provides quick output of the results of measurements; it is a universal instrument that integrates four modes in one. The instrument is rather convenient and mobile. But for some circuit breaker models the length of a cable for the milliohmmeter mode is not quite sufficient for convenient instrument manipulation. Battery charge for ‘microohmmeter with account of a current transformer’ mode is sufficient for one measurement only, which extends the diagnosis time, but the instrument has an option of fast battery charge.

    The MIKO-7 in the course of operation proved to be rather efficient. The only drawback is non-reliable "crocodile" clips. The instrument has a robust shock-proof housing that “saved” the instrument many times.

    The updated software of the milliohmmeter allowed us to save time and eliminate personnel’s mistakes. When we used a voltampermetre we had to carry several instruments, and a battery; their assembly took time, and measurements on a transformer took two hours minimum. Time of measurements using the MIKO-7 is halved or even makes one third of that.

    Benefits of the PKV/M7 include: information on the results of measurements and ability to operate the circuit breaker from the instrument. The MIKO-2.3 is rather mobile; the MIKO-7 has a large set of functions and automatic mode of operation.

    During the SKB EP instruments operation on the main electric equipment of the plant we did not face any problems, the instruments worked properly, without failures. On the auxiliary equipment the problems with electric motors were timely revealed (inter-winding short circuit, break of windings end).

    Specialists of Irkutsk HPP recommend the PKV/M7, MIKO-2.3 and MIKO-7 to all the companies as they are cost-effective analogues of the instruments of foreign manufacture.

  • Open Original

    JSC ATOMTECHENERGO Balakovo Branch Balakovoatomtechenergo

    A set of the PKV/M7, MIKO-2.3, and PKV-35 instruments manufactured by SKB EP has been in use at Balakovoatomtechenergo since 2011.

    During their operation the instruments proved to be rather efficient.

    The PKV/M7 instrument meets all our needs in the HV circuit breaker diagnosis. It provides convenient control of poles time difference using the PC software that shows defects in a circuit breaker long before they may cause a heavy failure; the function of graphs overlapping is also rather convenient.

    The PKV-35 instrument is used for measurement of minimum voltage of circuit breakers. It operates perfectly.

    The MIKO-2.3 MikroMilliKiloOhmmeter is characterized by universal nature (four modes in one) and high accuracy of measurements. The instrument is rather functional and convenient in use.

    Specialists of JSC ATOMTECHENERGO recommend the PKV/M7, MIKO-2.3, PKV-35 instruments to all the companies dealing with electric equipment maintenance, adjustment and operation in the electric networks.

  • Open Original

    Branch of OJSC Generating Company Naberezhno-chelninskaya TPP

    The MIKO-2.3 MicroMilliKiloOhmmeter has been used by electrical laboratory of Naberezhnye-Chelny TPP (thermal power plant) since 2015, and despite this short period of operation it proved to be rather efficient. The instrument is used for measuring the DC resistance of windings of electric motors, of transformers with the capacity of up to 240 000 kVA, turbine generators of up to 2000 000 kVa, for measuring the transient resistances of contacts of disconnectors, and of 110 kV circuit breakers. The instrument is convenient in operation; fast charging of an in-built battery whose capacity allows a considerable number of resistance measurements of contacts of up to 1000A or tests of several transformers of up to 1000 kVA at a time is worth special mentioning. Owing to relatively high test current the works performance on power transformers and turbo generators takes much less time as compared to measurements using DC bridges. The instrument also has a function of measuring the tested object temperature. Quality of connecting wires and clamps is appropriate. This instrument can be recommended for use in all the companies dealing with equipment testing.

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