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 0.1 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 (150 x 190 x 75 mm; 2.7 kg) MIKO-2.3 achieves cutting edge innovation, while the above features and self-contained power supply (charge time is 3 to 5 min) ensure full portability and high mobility of the instrument over the vast territory of substation or facility.
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||0.1 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|
|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)||AC 100-242 V, 47-63 Hz
DC 100-300 V
|Dimensions||150 x 190 x 75 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 battery charging during resistance measurement on electrical equipment.
Micro-ohmmeter test cable 1 x 2.3m + 1.1m with C-clamps.
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)
Micro-ohmmeter test cable 1 x 0.9m + 0.9m with crocodile clips and G-cramps. Maximum current up to 1000A.
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.
For resistance measurement of
The cable is intended / recommended for monitoring:
For resistance measurement of:
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).
With one double hand spike and one crocodile clip. Potential contact is spring-loaded. Length 0.9m. + 2.3m.
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 50 A.
The influence of inductance on the electrical resistance measurements results
Current instability of microohmmeters causes an additional error in resistance measurements proportional to the change in current during measurement and the circuit inductance.15 may 2020
Non-demountable periodic inspection – solution to the problem of operating worn-out electrical equipme
A distinctive feature of the SKB EP instruments is the ability to diagnose a circuit breaker without disassembling it, without draining the oil and disconnecting the shunt resistors, etc. Theyinspect all the mechanical parts and components of the circuit breaker at once, as well as check several characteristics of the assembly simultaneously.13 may 2020
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.
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
Kursk NPP the branch of Rosenergoatom Concern, JSC
At the present time in high-voltage test, measurements and diagnostic laboratory of the Kursk NPP electrical department there are two MIKO-2.3 devices in operation.
A complete package of documents, that was included in the complete set of devices, made it possible to register them with our metrology center without any problems.
During almost daily operation since January 2019, MIKO-2.3 didn’t have serious shortcomings and low-quality that could make the use of devices impossible have not been identified.
The main advantages of the MIKO-2.3 devices are the ease of use and the absence of errors in assembling the measuring circuit to compare with the traditional method of measuring ohmic resistance by the voltmeter-ammeter method. Digital indication of the measurement result eliminates the subjective factor when the operator senses the readings from the pointer indicator and the errors when calculating the result. Low weight, compactability, absence of moving and fragile details in the device simplifies the requirements for transportation on the territory of the outdoor switchgear and manual movement along the main building of the NPP.
During the working process with the devices on different types of NPP power equipment (from 0.4 kV and 6 kV switchgear equipment, 400 kVA power transformers, electric motors of all capacities to 630 000 kVA transformers, and 330 kV and 750 kV outdoor switchgear power equipment), the staff of our laboratory had several suggestions for improvement characteristics of MIKO-2.3.
Kursk NPP would like to thank SKB EP for the manufacture of high-quality devices and for the interest in the experience of its operating. We also look forward to the new developments that will be interesting to the specialists of electrical laboratories of various enterprises.
Head of the laboratory for high-voltage tests, measurements and diagnostics
Irkutsk HPP the branch of Irkutskenergo, PJSC
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 (13.8 kV), AREVA HGF-1012 (110 kV), SIEMENS 3AP1DT-145 (110 kV, 220 kV), and 3AP1DT-245 (220 kV); the MIKO-2.3 and MIKO-7 instruments are used on electric motors (0.4 kV) and disconnecting devices RVR(Z)-20/2000 M-U3, RGNP-110/2000-50UHL1, RDZ-1-110-2000UHL1, and RNDZ-220/2000U1 (13.8/110/220 kV).
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 low / high resistance meter 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.
MIKO-7 milli-ohmmeter in the course of operation proved to be rather efficient. The instrument has a robust shock-proof housing that “saved” the instrument many times.
The updated software of the milli-ohmmeter 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 and operative; 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.