Modern microohmmeter MIKO-21

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
  • Russian Register of Innovative Products
  • Recommended for use in JSC Russian Railways electric installations
  • PJSC ROSSETI Register of Innovative Solutions

Wide functionality and high precision ±0.05%

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Adjustable test current up to 200 A

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Special algorithms for measuring contact resistance of HV circuit breakers with in-built current transformers (CT)

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4 ways of resistance measurement start-up

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Automatic storage of measurement results

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Automatic indication of measured resistance thresholds

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Color graphic touch-screen, intuitive interface

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Battery-operated power supply, light weight and size

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Variable instrument complete set

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MIKO-21 enables transient resistance measurement of electric circuits in the range from 0.1 µΩ

  • to 2 Ω with an accuracy of ±0.05%.
  • in high-voltage circuit breaker contacts,
  • in disconnecting switches, separators, and short-circuiters,
  • in packaged switchgears,
  • in contact couplings,
  • in contactors, busbar relays and joints,
  • in bolted connections, braze joints, weld seams in outdoor and indoor switchgears up to 750 kV in conditions of intense and highly complex electromagnetic environments.

MIKO-21 is ahead of similar devices represented on the market due to a number of functional and technical features. For example, special measuring technologies ensure MIKO-21 compliance with the most stringent accuracy requirements. MIKO-21 is ideally applicable for high-precision resistance tests in the µΩ range.

One of the problems during transient resistance measurement with permissible error is availability of oxide films between contact surfaces.

According to international standard IEC 60694: General Specifications for High-Voltage Switch Gears (International Electrotechnical Commission), to control this type of error test current amperage during testing the electric resistance in the main circuit of a HV circuit breaker shall be between 50A and its rated value.

Test current in foreign circuit breakers is often limited by specific values: 100 A and 200 A.

The amperage in MIKO-21 can be set in several ways:

  • By selecting from a number of specified values: 10 A, 50 A, 100 A, and 200 A;
  • By setting the automatic mode for selecting test current;
  • Manual mode for setting test current in the range from 1 to 200 A at a step of 1 A.

SKB EP microohmmeters are the only instruments enabling to measure contact resistance of live tank and dead tank circuit breakers using separate automatic modes optimized for those circuit breakers.

  • Mode 1 makes it possible to carry out measurement in the circuits without CT;
  • ­Mode 2 enables to operate measurement in the circuits with CT with minimal battery power consumption;
  • Mode 3 enables to operate measurement in the circuits with CT using 100 A or 200 A current (set by a user) without saving the battery power.

Current transformers of bulk-oil circuit breakers form an extended transition process when test current is applied. Due to that measurement time is determined by parameters of CTs, their number, and test current. For example, for HV oil circuit breaker measurement time may be up to 30 seconds.

MIKO-21 special algorithms with automatic measurement stop prevent subjective errors and increase number of measurements per one battery charge.

Four ways are programmed in the instrument to start resistance measurement:

  • Single is launched once the cable clamps are contacted to the tested object and followed by pressing the START button.
  • Auto single circuit is initiated by pressing the START button. The instrument will start measurement when the electric contact between the tested circuit and the test cable contacts is set. The test can be repeated by pressing the START button again.
  • Periodic is used in pre-specified time intervals when both hands are occupied with cable probes pressing against the test points. The user can choose time interval between the tests. The instrument will work continuously until the user stops the mode.
  • Auto periodic circuit is initiated by pressing the START button and used for continious measurements. The user connects the current cable, and as soon as the potential contacts are connected, the measurement will start automatically. To repeat a test, simply break contact with potential probes and reconnect.
The instrment contains a built-in database that contains passports of high-voltage circuit breakers indicating the maximum and / or minimum permissible values ​​of contact resistance of the contacts and passports for rejected resistors indicating the acceptable values ​​of the upper and lower thresholds of resistance.

The user can add / delete / edit the passport values ​​of the measured object.

Availability of an in-built archive of passport values of eclectic resistances (main circuit of HV circuit breakers) facilitates automatic detection, and the device beeps if the results of measurements go beyond the permissible limits.

This mechanism works due to the built-in database of passport values, as well as due to the ability to  add / delete / edit the passport data of the measured object independently.

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

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

Communication with PC via USB or a flash card facilitates data transfer from the Instrument to the Company's data base.

The device can be integrated into measuring systems under PC control of diagnostic laboratories and companies producing electric equipment.


Battery power, low weight and dimensions ensure complete independence and high mobility of the device in the vast territory of the substation or workshop, and the built-in memory for 200 measurements greatly simplifies the process of diagnosing and receiving data from the substation into the organization’s office.

For convenience of connecting to the object, special measuring cables of different lengths and different types of clamps are used:

  • Measuring sets with crocodile clip for high voltage circuit breakers up to 110 kV 2 m long (standard equipment);
  • Measuring sets with spring-loaded needle contacts 1.5 m long for measurement in pipelines and interrupting chambers (recommended when placing the device near the switch);
  • Measuring sets with G-clamp for circuit breakers from 10 kV to 220 kV 4.5 m and 6 m long (recommended when placing the device near the circuit breaker);
  • Measuring sets, which consist of a cable with a crocodile clamp and a G-clamp Нfor circuit breakers from 220kV to 750kV 3m, 6m and 9m long (recommended when placing the device in a cradle of a lift);
  • Measuring cable for precision measurements and measurements on sections of the electric circuit to the extreme points which a measuring current is applied.
Specifications Value
Resistance range, Ohm 0.1 µΩ ÷ 2 Ω
Current range, A 1 ÷ 200
Number of digits in the output of the measurement result 5
Accuracy ±0.05 %
Time of measurement in Mode 1, sec not more than 2
Time of measurement in Mode 2 on a bulk-oil circuit breaker, sec 10 ÷ 30
Time of measurement in Mode 3 on a bulk-oil circuit breaker with battery charge saving, sec 5 ÷ 15
Mains voltage ~90-264, 47-63 Hz = 127-370 V
Consumed power does not exceed, W 60
Battery type Li-Ion
Battery lifetime (in continuous operation), hrs more than 8
Battery recharge time, hrs less than 2
In-built memory 1000 measurements
Number of tests (max. current, I=200A) more than 500
PC communication USB / USB Flash
Display Color graphic display,
multi-sensor, 480x272 pix
Interface, User manual language English
Environmental protection with closed cover IP 67
Environmental protection with open cover IP 40
Storage temperature, ºС -20 ÷ +60
Operating temperature, ºС -20 ÷ +50
Relative humidity, % (non condensing 95
Dimensions, mm 270 х 246 х 124
Test block weight, kg (lbs) 3.3 (7.28)
Interface and user's manual language English
Testing period, year 3
Calibration period, years 3
Warranty period, years 3

Standard complete set

Photo Item, Index Application
Test block of MIKO-21
  • Test block of MIKO-21
  • SKB039.00.00.000
  • Test block of MIKO-21
  • SKB039.00.00.000

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

Set #2
  • Set #2
  • SKB039.27.00.000
  • Set #2
  • SKB039.27.00.000

Current cables 2x2m (1.12 kg) with crocodile clips (jaw up to 50 mm) for circuit breakers of up to 10kV.

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 power line. 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 1.75 m. Weight 0.07 kg. For instrument grounding. Terminated with a G-clamp and a lug for a screw. Rated current – 50А.

Shunt
  • Shunt
  • Shunt

Type: 75ShSM M3 (75ШСМ М3). For checking MIKO-21 operability.

Safety devices
  • Safety devices
  • Safety devices

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

Tool bag
  • Tool bag
  • SKB126.06.00.000
  • Tool bag
  • SKB126.06.00.000

Convenient, robust, wear proof bag for transportation of cables, documentation and other accessories to MIKO-21.

Test cables, if the instrument is placed next to the circuit breaker (on order)

Photo Item, Index Application
Set #1
  • Set #1
  • SKB039.19.00.000
    SKB039.19.00.000-01
  • Set #1
  • SKB039.19.00.000
    SKB039.19.00.000-01

Current cables 2x1.5m (0.87 kg) with spring-loaded needle-type contacts for measurements in busbars or in arc extinguish chambers. Current range up to 200A.

Set #3
  • Set #3
  • SKB039.25.00.000
  • Set #3
  • SKB039.25.00.000

Current cables 2x4.5m (3.79 kg) with a G-clamp (jaw up to 80 mm) for all the circuit breakers of up to 35kV, and for some circuit breakers of up to 110kV.

Set #4
  • Set #4
  • SKB039.26.00.000
  • Set #4
  • SKB039.26.00.000

Current cables 2x6m (2.83 kg) with a G-clamp (jaw up to 80 mm) for all the circuit breakers of up to 110kV and some circuit breakers of up to 220kV.

Test cable
  • Test cable
  • SKB039.24.00.000
    SKB039.24.00.000-01
    SKB039.24.00.000-02
  • Test cable
  • SKB039.24.00.000
    SKB039.24.00.000-01
    SKB039.24.00.000-02

Test cable with crocodile clips A25C (2 pcs) and a probe (2 pcs) for precision measurements and for measurements on the sections of the circuit to the end points of which the test current is applied.

  • To be used together with Set #2 - Length 2 m (SKB39.24.00.000)
  • To be used together with Set #3 - Length 4.5 m (SKB39.24.00.000-01)
  • To be used together with Set #4 - Length 6 m (SKB39.24.00.000-02)
  • In particular, the cable can be used in case of measuring cables resistivity.

Test cables, if the instrument is placed in the lift cradle (on order)

Photo Item, Index Application
Set #5
  • Set #5
  • SKB039.20.00.000
    SKB039.21.00.000
  • Set #5
  • SKB039.20.00.000
    SKB039.21.00.000

Test cable kit for circuit breakers of up to 220kV.

  • Current cable 1x1m (0.5 kg) with crocodile clips (jaw up to 50 mm).
  • Current cable 1x3m (1 kg) with a G-clamp (jaw up to 70 mm).

Set #6
  • Set #6
  • SKB039.20.00.000
    SKB039.21.00.000
  • Set #6
  • SKB039.20.00.000
    SKB039.21.00.000

Test cable kit for circuit breakers of up to 330kV, and some of up to 500kV.

  • Current cable 1x1m (0.5 kg) with crocodile clips (jaw up to 50 mm).
  • Current cable 1x6m (2 kg) with a G-clamp (jaw up to 70 mm).

Set #7
  • Set #7
  • SKB039.20.00.000
    SKB039.21.00.000-02
  • Set #7
  • SKB039.20.00.000
    SKB039.21.00.000-02

Test cable kit for circuit breakers of up to 750kV.

  • Current cable 1x1m (0.5 kg) with crocodile clips (jaw up to 50 mm).
  • Current cable 1x9m (4 kg) with a G-clamp (jaw up to 70 mm).

Additional accessories (on order)

Photo Item, Index Application
Potential spring-loaded contact (2 pcs.)
  • Potential spring-loaded contact (2 pcs.)
  • SKB023.21.00.000
  • Potential spring-loaded contact (2 pcs.)
  • SKB023.21.00.000

Together with Sets ##3-7 for avoiding high transient resistances between an input pin and a cramp of the device.

Potential pin contact (2 pcs.)
  • Potential pin contact (2 pcs.)
  • SKB023.22.00.000
  • Potential pin contact (2 pcs.)
  • SKB023.22.00.000

Together with Sets ##3-7 for avoiding high transient resistances between an input pin and a cramp of the device.

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

USB cable 1 x 2m. For computer connection and data transfer. 

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.

Modern microohmmeter MIKO-21
  • Open Original

    Power Authority of SUEK-Kuzbass, JSC

    In response to your request dated 02.07.2020, we inform you that the MIKO-21 microohmmeter ser.no. 021J has been operated in the electrical measuring laboratory of SUEK-Kuzbass, JSC Power Authority since 2019. The device was especially purchased to measure resistance of the main circuit contacts of high-voltage circuit breakers and disconnectors in order to detect defects and to reduce the probability of failure of switching devices caused by contacts resistance increase.

    The device might be definitely called convenient-to-use according to the presence of the in-built battery. The battery allows you to run measurements independently without connecting to the network. Moreover, the battery doesn’t require to be charged frequently. With intensive work, it is necessary to recharge the battery no more than once a week.

    The measurement accuracy of the device is high. With repeated measurements, the readings on the display are the same.

    When the opportunity comes, we plan to purchase one or two more MIKO-21 microohmmeters.

  • Open Original

    COMPANY LIMITED DIMITROVGRADSKY METALLURGICAL PLANT

    On July 1-2 Dimitrovgradsky metallurgical plant, LLC was testing the MIKO-21 microohmmeter. The instrument was used for measuring the electric resistance of copper items.

    MIKO-21 is a convenient multi-functional instrument with user-friendly menu. One of its merits is a large range of manually set values of test current and an option of data downloading to PC. Touch color display, an archive of passport values of tested equipment, independent power supply and small size are also worth mentioning. The instrument demonstrated proper operation, there were no failures.

  • Open Original

    ELMASH (UETM), LLC

    In the first quarter of 2017,  ELMASH (UETM), LLC (Yekaterinburg City), a research and testing division of BBA Production Complex performed pilot operation of MIKO-21 microohmmeter manufactured by SKB EP, LLC.

    The microohmmeter was used for measuring the transient resistance of the main circuits of high-voltage column-type and bulk-oil circuit breakers of ВГБ-УЭТМ®-35, ВГТ-УЭТМ®-110, ВЭБ-УЭТМ®-220 types.

    We should like to note the following merits of the microohmmeter: simple and user-friendly interface, touch display, small size and light weight, availability of the option of connecting the device to PC. Microohmmeter can be powered both from the 230V network and from an in-built battery that is a big advantage since devices are often used far from the available power sources.

    The device’s kit allows a large variety of options. During pilot operation the microohmmeter proved to be a reliable and convenient device. There were no failures observed.

  • Open Original

    JSC Moscow Helicopter Plant named after M.L. Mil

    In 2016, following the request of OJC MVZ named after M.L. Mil, SKB EP, LLC developed a new line of MIKO-21 microohmmeter specifically for solving the tasks of our Company.

    Using MIKO-21, OJSC MVZ named after M.L. Mil performs measurements of transient resistances of:

    • Aircraft equipment and helicopter fuselage;
    • Wire terminations in cap fittings and couplings.


    Test operation of MIKO-21 in 2016 revealed certain drawbacks in the device’s design and software that were completely eliminated by the Manufacturer.

    Since 2017 the MIKO-21 of special complement has been regularly used by JSC MVZ named after M.L. Mil and proved to be an instrument reliable and convenient in operation that fully replaces similar obsolete devices.

    The main merit of MIKO-21 microohmmeter is its simple and understandable interface, sensor display, small size and low weight, options of being powered from 220V, 50 Hz networks and from an in-built battery.

    There were no failures during the period of its operation.

  • Open Original

    Federal Network Company of Single Energy System

    That PAO FSK EES Branch operates the following instruments: MIKO-1 (16 pcs.), PKV/M7 (6 pcs.), PKV/M6 (4 pcs.), PKV/U3.1 (1 pcs.), MIKO-21 (1 pcs.).

    First instruments were procured in 2010. The instruments were used for monitoring and diagnosis of electric equipment at 220 and 500 kV substations.

    MIKO-1 device is rather convenient in use as it is powered from an in-built battery; it has small weight and size. It can be easily connected to any measured equipment owing to cable with clamps of two types. The process is easily controlled, measurements are of high accuracy; capacity of the in-built battery is sufficient for a large number of measurement sessions.

    We used PKV/M6 and PKV/M7 instruments for recording the time and speed characteristics of circuit breakers U-110, MKP-110, U-220, VMT-110, VMT-220, MKP-35, C-35, and of 6-10kV oil circuit breakers. The process of connection and diagnosis is rather simple.

    We recommend PKV/M6 and PKV/M7 instruments to all the companies dealing with maintenance and operation of electric equipment and to electric network companies.
  • 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

    Switchgear Design Bureau, LLC

    In 2017 - 2019, our company acquired three MIKO-21 instruments, which are successfully used to measure the transition resistance of various types of high-voltage circuit breakers production by our company.

    During the work, the following advantages were identified:

    1. Automatic start of measurements;
    2. The ability to independently adjust the current strength;
    3. Ability to work on mains or battery;
    4. The ability to control the device through the PC using the included software; 
    5. The ability to transfer and save data on the PC.
    Separately, we note the comprehensive technical support of the manufacturer of the device regarding its operation.

    We can confidently recommend the MIKO-21 instrument to other companies and are allowed to post a review on the skbpribor.ru website

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