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: micro-ohmmeter, milli-ohmmeter, kilo-ohmmeter and thermometer.
Multipurpose low / high resistance meter MIKO-2.3
Operates in 4 modes: micro-ohmmeter, milli-ohmmeter, kilo-ohmmeter and thermometerMore
Multipurpose instrument that performs all tasks regarding resistance measurement in high-voltage equipmentMore
Micro-ohmmeter mode: contact resistance measurement at maximum current of 1,000 А in the range 1 μΩ - 0.1 ΩMore
Milli-ohmmeter mode: winding resistance measurement within the range 100 μΩ - 1 kΩMore
Kilo-ohmmeter mode: resistance measurement within the range 0.1 kΩ - 300 kΩMore
Thermometer mode: measurement of temperatures of different environments within the range -20°C to +120°CMore
Automatic self-tuning for the measurement objectMore
Self-contained power supply, small dimensions and weightMore
Test cables of unique and ergonomic designMore
All types of electrical equipment (transformers, electrical machines and electrical switching devices) require different means for full-rate diagnostic. 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 micro-ohmmeter, milli-ohmmeter, thermometer and even kilo-ohmeter 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.
Micro-ohmmeter mode is designed for measuring contact 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 micro-ohmmeters 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 inaccuracy in the measurement of resistance.
MIKO-2.3 surpasses all foreign and domestic micro-ohmmeters. The closest micro-ohmmeter 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 micro-ohmmeter 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.
Milli-ohmmeter mode is designed for measurement of direct-current resistance in circuits with high inductance (transformers, electromagnets etc.) within the range of 100 μΩ - 1 kΩ.
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 "milli-ohmmeter" 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.
Kilo-ohmmeter mode is designed for measurement of resistance of ballast, shunt, additional and other resistors with induced voltage up to 5 kV, as well as without induced voltage within the range of 0.1 kΩ - 300 kΩ.
Thermometer mode is designed to measure the temperature of oil, water, air and other non-aggressive environments within the range from -20°C to +120°C.
Identification of each of the four modes is automatic by connecting the corresponding test cable.
Due to a combination of functional and mass-dimensional parameters (200 x 151 x 68 mm; 2.7 kg) MIKO-2.3 achieves cutting edge innovation, while the above features and self-contained power supply ensure full portability and high mobility of the instrument over the vast territory of substation or facility.
The ability of MIKO-2.3 to supply current up to 1000A is realized due to the operation of a condenser battery. The presence of such type of a battery provides full charging of the instrument from 0% to 100% in 5 minutes! Nevertheless, rapid discharge also occurs in some modes of the instrument operation, that determines the dependence of MIKO-2.3 on electrical network. In order to eliminate this nuance, SKB EP has developed an external battery of a modern lithium-ion type which has received the symbol – power bank. The main task of the power bank for MIKO-2.3 is to maintain the charge of its built–in condenser battery to increase the operating time of the instrument and raise the number of measurements without connecting to the network - more details at the link.
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.
MIKO-2.3 instrument is easy to use and maintain, reliable and resistant to electromagnetic field influence.
MIKO-2.3 input cables are equipped with crocodile clips with G-cramps of unique design that has no analogues by other manufacturers of instruments. This design ensures quick and faultless connection to an object that excludes errors of measurement of small resistance values, and ensures reliable contact even in case of oxygenated surfaces of an object.
Besides, there is an option of a four-clamp connection of the instrument cables to circuit-breaker bushings and to transformers through external potential contacts.
|Measurement display resolution||4 digits|
|Resistance range||1 μΩ - 0.1 Ω|
|Test current output||10 - 1,000 А|
|submode "CT-no"||< 2 sec|
|submode "CT-yes"||< 30 sec|
|submode "CT-yes Tmax"||< 20 sec|
|Resistance range||100 μΩ - 1 kΩ|
|Test current output||0.5 - 5 А|
|Measurement time||from 10 to 900 sec|
|Resistance range||0.1 kΩ - 300 kΩ|
|Measurement time||< 3 sec|
|Temperature measurement range||-20°C - +120°C|
|Power supply (built-in battery)||Condenser|
|Battery charging time||5 min|
|Power supply (Power bank)||Lithium-ion|
|Charge time for ZU-2A (Power bank)||6 hrs|
|Operation time with the use of Power bank ZU-2A in the milli-ohmmeter mode||2.5 hrs|
|Number of measurements with the use of Power bank ZU-2A in the micro-ohmmeter mode||400 pcs|
|Built-in memory||100 measurements|
|PC connection||RS-232 and USB (when using adapter)|
|Display||Alpha-graphic, 6 x 2.5 cm|
|Power consumption||< 60 W|
|Power supply (mains voltage)||100-242 V AC, 47-63 Hz
100-300 V DC
|Dimensions||200 x 151 x 68 mm|
|Instrument weight||2.7 kg|
|Operating temperature range||-20°C - +40°C|
|Warranty period||13 months|
|Recommended calibration interval||1 year|
|Interface and user manual language||English|
Standard complete set
Instrument, a stand for the instrument, and documents: User Manual and Log book.
For charging the built-in condenser battery of the instrument during resistance measurement on electrical equipment.
Micro-ohmmeter test cable 1 x 2.3 m + 1.1 m with C-clamps. 900А. Weight is 2.12 kg.
For connection to the input pin. Included into the complete set of the K162 measuring cable.
For connection to the input pin. Included into the complete set of the K162 measuring cable.
Milli-ohmmeter test cable 1 x 6m + 2m with input pin diameter up to 37 mm.
Kilo-ohmmeter test cable 1 x 3.4m + 2.1m.
Thermometer cable 1 x 1.8m. For temperature measurement of oil, water and air.
Mains cable 1 x 11 m. Weight 0.68 kg.
Interface cable 1 x 1.5m. For PC connection and data transfer.
Type: 75ShSM M3 (75ШСМ М3). For functional check in micro-ohmmeter and milli-ohmmeter modes.
Accuracy check of the zero point on the resistance scale. The value is 0,000 µOhm.
Convenient and durable bag, providing additional mobility during the operation of the device.
Convenient and durable bag for transporting cables and accessories.
Additional complete set (on order)
The unit functions as Power bank for the charge maintenance of the built-in condenser battery of the instrument. Battery charge maintenance time is up to 2.5 hours during continuous measurement in the milli-ohmmeter mode, and for not less than 400 measurements in micro-ohmmeter mode.
Kelvin C-clamp test cable (jaw up to 80 mm) 1 x 0.9m + 0.9m. Maximum current up to 1000A.Weight is 2.3 kg.
Micro-ohmmeter test cable 1 x 4.5m + 1m with crocodile clip and G-cramp. Maximum current up to 500A.
Micro-ohmmeter test cable 1 x 3.8m + 1.7m with crocodile clip and G-cramp. Maximum current up to 500A.
Micro-ohmmeter test cable 1 x 10m + 1m with crocodile clip and G-cramp. Maximum current up to 500A.
Kelvin Clamp test cable, jaw up to 50 mm. Current up to 200A. Length 0.9m. + 0.9m. Weight is 1 kg.
Kelvin Clamp test cable, jaw up to 50 mm. Current up to 200A. Length is 2.27m. + 0.9m. Weight is 1.78 kg.
For resistance measurement of: air high-voltage circuit breakers and SF6 high-voltage circuit breakers.
Micro-ohmmeter cable 1 x 1.8m + 1.8m (can be changed on demand) with removable probes and removable small crocodile clips.
Micro-ohmmeter double hand spike test cable 1 x 1.1m + 1.9m (potential contact is spring-loaded).
Kelvin C-clamp test cable 1 x 0,9 m + 2,3 m (jaw up to 50 mm). Potential contact is spring-loaded. Current up to 200A. Weight is 1.34 kg.
Milli-ohmmeter test cable 1 x 9m + 9m (input pin diameter up to 37 mm).
Milli-ohmmeter test cable 1 x 6.5m + 6.5m (input pin diameter up to 37 mm).
Milli-ohmmeter test cable 1 x 6.5m + 6.5m (input pin diameter up to 80 mm).
Extension cable 1 x 8.5m.
Milli-ohmmeter cable 1 x 3m.
Kilo-ohmmeter cable 1 x 0.8m + 0.8m.
Manipulating rod is designed for test cables connection from the ground or from the tank cover to the bushings of high-voltage circuit breakers, and to the structural elements of high-voltage disconnecting switches and earthing devices, without the use of ladders or elevated platforms.
The manipulating rod is completed with special extension cables. There is a Kelvin clamp with current and potential contacts to connect to the object on one side, and a contact pad on the other side. The device test cable is connected to the contact pad from the ground or a tank cover.
Manipulating rod extension cable is made according to a four-wire (Kelvin) scheme with the test current capacity of 100 A in the presence of a good contact.
We are increasing the operating time of MIKO-2.3 from the battery!
In the course of identifying customer needs and modern trends we decided to create a power bank for MIKO-2.3 charging3 october 2022
SKB EP devices’ demonstration for Russian Railways, JSC team
The results of MIKO-9A and MIKO-2.3 demonstration held for Russian Railways, JSC employees28 june 2021
Comparison of SKB EP micro-ohmmeters
SKB EP company implements three specialized micro-ohmmeters for resistance measurement - MIKO-21, MIKO-1 and MIKO-10, as well as a universal multipurpose low / high resistance meter MIKO-2.3 for resistance measurement in inductive and non-inductive objects.21 june 2022
Comparison of SKB EP milli-ohmmeters
SKB EP company implements three specialized instruments for DC resistance measurement in inductive objects - MIKO-7M(A), MIKO-8M(A) and MIKO-9A, as well as a universal instrument for inductive and non-inductive objects - multipurpose low / high resistance meter MIKO-2.321 june 2022
Multipurpose low/high resistance meter MIKO-2.3 review
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.
Multipurpose low / high resistance meter MIKO-2.3
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.
Western main power networks the branch of KEGOC, JSC
There are the following instruments for control and diagnostic in the Testing and diagnostic Department of the branch of KEGOC, JSC "Western main power networks":
The high-voltage circuit breaker analyzer PKV/M5 (with the serial number 7) has been in the operation since 2001 and has been working without problems for more than 18 years. It is easy to use digital indication during the preparation of the instrument as well as during time and speed parameters measurements of oil HV circuit breakers MKP-110, VMT-110B, VMT-220B types. The maintenance operations were carried out effectively and on time. The instrument has been taken out of production nowadays.
Universal multipurpose low / high resistance meter MIKO-2.3 (the serial number 063) has been being used in the testing department since 2017. It qualitatively measures the DC resistance of contacts of high-voltage circuit breakers of all types, of measuring and power transformers windings. The usability, convenient and clear digital indication of the instrument led to significant reduction in working time when conducting measurements on electrical equipment with a voltage class from 0.4 kV to 220 kV. Some defects were detected in the power contacts of high-voltage circuit breakers due to the formed burnings.
"Western main power networks" the branch of KEGOC, JSC thanks SKB EP, LLC for convenient and high-quality instruments production and also hopes for further collaboration.
Yamalo-Nenets enterprise of the main power networks the branch of FGC UES, PJSC
Yamalo-Nenets enterprise of the main power networks the branch of FGC UES, PJSC thanks your company SKB EP, LLC for the fruitful cooperation in the supply of measuring instruments for the diagnostic of high-voltage equipment. We also thank you for prompt, professional work and individual approach, as well as for the high quality of instruments and its components.
Our company operates such instruments as MIKO (10 pcs.), and PKV (10 pcs.) manufactured by SKB EP, LLC.
These instruments are used to determine repair quality of high-voltage circuit breakers and disconnecting switches. The contact resistance of the current-carrying circuit, the time and speed characteristics of HV circuit breakers are checked with a help of them.
The instruments are very convenient, they give an opportunity to identify the worsened condition of contact connectors on HV circuit breakers and of disconnecting switches. They reduce the time for detecting a defect and prevent accidents and technological disturbances. The defects are periodically identified. That fact allows us to schedule a necessary repair work on time and maintain the equipment in a good working condition.
We recommend these instruments for use in organizations, which operate high-voltage equipment.
Thank you for your help in solving our production tasks and sincerely hope for further mutually beneficial cooperation.
Acting Chief Engineer-Deputy Director
Kambaratinskiye HPP the branch of Electric stations, JSC
MIKO-2.3 devices have been in operation at our enterprise since 2018. During the operation, devices have proven themselves as reliable, multifunctional, compact. The device is convenient to carry out measurements, and it also has the function of automatic recalculation of measurement results. MIKO-2.3 device is used at Kambaratinskiye HPP for contact resistance measurements on disconnectors of RGN-110 type, SF6 circuit breakers of VGT-110 type, current transformers, voltage transformers, power transformers and electric motors of all capacities. No malfunctions were detected during the use of the device.
The disadvantage of MIKO-2.3 is the rapid discharge of the battery when using the microohmmeter mode.
[Manufacturer note]: The rapid battery discharge in this mode is explained by the supply of an operating test current of up to 1,000 A. it is also worth mentioning that the battery is fully charged in 5 minutes.
Using this device, we have reduced the total amount of time spent for measurements and tests.
Taking into account the above, we can recommend this device for specialists of electrical laboratories of various enterprises.
Krasnoyarsk CHPP-2 the branch of Yeniseyskaya TGC (TGC-13), JSC
Currently, Krasnoyarsk CHPP-2 the branch of Yeniseyskaya TGC (TGC-13), JSC has MIKO-2.3 and PKV/U3.1 devices in operation at the electrotechnical laboratory.
During the use since 2017, there have been no complaints or shortcomings in the operation of these devices. These devices are quite simple and easy to use.
We thank SKB EP, LLC for manufacturing high-quality devices, and hope for the appearance of new developments.
Taksimovskaya distance of power supply the branch of Russian Railways
In Taksimovskaya distance of power supply we have been operating MIKO-2.3 micro-milli-kilo-ohmmeter manufactured by SKB EP LLC. This is the second device of this type. The first one, MIKO-1, has been in operation at the distance for about ten years and has proven itself perfectly, as well as the new device. With the help of MIKO-2.3 we check DC resistance of the current-carrying circuit of high-voltage circuit breakers. Large values of this resistance can lead to serious damage of electrical equipment and local heating of current-carrying parts. The advantage of MIKO-2.3 is the design of the test cables with a built-in C-clamp, which provides easy and error-free connection to the measurement object. Light weight and small dimensions make it easy to move the device to the measurement equipment.
I can surely recommend devices manufactured by SKB EP, LLC to other operating companies.
SS Sakhalin RHPP the branch of Sakhalinenergy, PJSC
We would like to inform you that the following devices manufactured by SKB EP, LLC are in operation at Sakhalin RHPP: PKV/M7, MIKO-2.3, PKR-2.
The devices have proven themselves to be a good side in terms of operation. Their use allows you to significantly save time for diagnostics of electrical equipment and improve the quality of repairs. The devices are distinguished by ease of operation, compact design, good build quality and high accuracy.
We are grateful to SKB EP, LLC for the manufacture of high-quality diagnostic devices and for the interest that was shown to the experience of use of their devices. We also hope for the manufacture of new developments that will interest the specialists of electrical laboratories of power enterprises.
Kuban MEN the branch of FGC UES, PJSC
I would like to inform you that in the branch of FGC UES, PJSC - Kuban CMEN uses MIKO-1, MIKO-2.3, MIKO-10, and MIKO-21 microohmmeters.
During the operation, MIKO-group devices have proven themselves to be the best in terms of reliability, ease of use and accuracy of the results obtained on the state of the switching equipment (circuit breakers, disconnectors). The devices are also good at resistance measurement of pressed connections, resistance measurement of transformer windings. The devices are easy to transport (there is a special carrying bag), they are convenient to use due to the small size and built-in power supply.
Among the disadvantages there is the lack of crocodile clips (or clamps) in the standard complete set for connecting to a large-section busbar (rigid busbar, hollow wires).
[Manufacturer note]: Device complete set includes those cables that are most often used on various types of objects. Cables that help to measure resistance on large-section busbars are unfortunately used not as often, so they are included to the additional complete set of the devices and are available by request.
Devices manufactured by SKB EP, LLC gave a good account of themselves and can be recommended to the companies performing adjustment or repair works, testings and measurements.
Eastern Electrical Grids the branch of IPGC, OJSC
In the Eastern Electrical Grids the branch of IPGC, OJSC we have been using the following devices manufactured by SKB EP, LLC:
- PKV/M7 circuit breaker analyzer (since 2012);
- MIKO-1 microohmmeter (since 2014);
- MIKO-2.3 micromillikiloohmmeter (since 2019).
PKV/M7 circuit breaker analyzer proved to be reliable, there was not a single case of failure. The device allows to measure several parameters in one measurement cycle, which significantly reduces the total time spent on assessment of the circuit breaker technical condition. The ability to use local and remote start expands the application area of this instrument.
MIKO-1 microohmmeter has established itself as a simple, unpretentious in use, but quite accurate device. It is compact, and its test cables are flexible, therefore the work might be done even at low temperatures.
MIKO-2.3 device is easy to use due to its small size. The device is equipped with a convenient and useful carrying bag in that you can put all the accessories and test cables. Additionally, we purchased test cables of different lengths and different other accessories that made it easier to work with the device on various equipment. During the use of the device, no failures in its operation were detected.
We express our gratitude to SKB EP, LLC for the production of high-quality and reliable devices and we recommend the use of these devices to companies of various activity types.
Electrotechnical Laboratory of the Yaroslavl Power Supply Distance of the Northern Energy Supply Directorate
To date, the following devices are in operation in the electrotechnical laboratory of the Yaroslavl Power Supply Distance of the Northern Energy Supply Directorate: MIKO-2.3, MIKO-7, PKR-1 and PKV/M7.
These devices are used in conducting a comprehensive survey of electrical equipment of substations, such as power and converter transformers, high-voltage circuit breakers, and disconnectors. During the tests, SKB EP devices gave a good account of their reliability, stability of operation, and ease of use. When using the above-mentioned devices, total measurement time was reduced.
The use of PKR-1 OLTC analyzer made it possible to more accurately determine the defects of the power transformer and tap changing device during a comprehensive check-up. The most frequently diagnosed damages are burning and adjustment of the contactor contacts of the tap changing device. The second most common defect is the burning of circuit breaker contacts. One of these defects was confirmed by the visual inspection.
The use of MIKO-2.3 and MIKO-7 devices that are dedicated to the resistance measurement in inductive circuits gave the greatest reduce of measurement time. When using an AC bridge, one resistance measurement of the 110 kV transformer winding lasted about 1.5 minutes. When using MIKO-2.3 or MIKO-7 devices, the time spent on one measurement was reduced to 30 seconds.
PKV/M7 circuit breaker analyzer is used for a comprehensive assessment of the state of high-voltage circuit breakers. As the main direction was chosen the assessment of SF6 circuit breakers of MKP-110 type. There is a big survey conducted of SF6 circuit breakers installed instead of oil circuit breakers. The use of PKV/M7 circuit breaker analyzer has reduced the time spent on the diagnostics of circuit breakers, and increased the accuracy of the data obtained. Previously, the measurements of the moving parts movement and compression were controlled by a ruler with oil drained from the circuit breaker tank. PKV/M7 circuit breaker analyzer is, first of all, more comfortable to use and has better accuracy comparing to the previously used methods.
Having experience in the operation of SKB EP devices since 2016, we can definitely recommend the use of these devices for diagnostics of energy facilities.
The branch of Rosseti Tymen, JSC - Nizhnevartovsk Electrical Networks
We have been using the devices MIKO-2.3 (2 pcs.), PKV/M7 (1 pc.) and MIKO-1 (1 pc.) in the Vakhsky district of Nizhnevartovsk electrical networks.
We have been working with your devices for more than 10 years on the following types of high-voltage switches: VGB-35 (6-110kV), S-35 (with the drives SHPE-12 and PP-67), VMT-110, VGT-110, transformers TM (6-10 kV), TMG (6-10kV), and various types of disconnectors with the voltage 6-220 kV.
All the devices are quite convenient to use.
With the help of your devices, we have detected a lot of equipment malfunctions.
The accuracy of the results compared to similar devices of other manufacturers is at a high level. I can sincerely recommend your devices to other organizations.
T. N. Ratnikov
Chief Foreman of the Vakhsky District of Nizhnevartovsk electrical networks