Compact micro-ohmmeter MIKO-10

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.

S.I.Kandiano
Acting Chief Engineer-Deputy Director

The electrical laboratory of Vorkutinskaya TPP-2 Vorkutinskiye TPP, LLC T Plus, PJSC has in its instrumental and technical base the following devices manufactured by SKB EP, LLC:

• MIKO-1 micro-ohmmeter that is used since 2005;
• MIKO-10 micro-ohmmeter that is used since 2017;
• PKV/M5N high-voltage circuit breaker analyzer that is used since 2006 with an angular movement transducer DP21 and a linear movement transducer DP12;
• PKV/M7 high-voltage circuit breaker analyzer with a PUV-regulator device that are used since 2018, with an angular movement transducer DP21 and a linear movement transducer DP12.

With the help of micro-ohmmeters, electrical laboratory personnel measures DC resistance of contact connections, and PKV/M5N and PKV/M7 devices are actively used to measure the speed and time parameters of circuit breakers of 6, 35 and 110 kV voltage classes.

Micro-ohmmeters are convenient to use due to their autonomy and mobility. PKV/M5N device, despite its long service life, is relevant during the diagnostic of high-voltage circuit breakers (due to the presence of linear and angular movement transducers in the complete set), but, due to moral aging and replacement with new analogues, the device cannot be supplemented with new components. The new PKV/M7 device is supplemented with all the necessary spare parts, is modern, mobile, accurate and, based on this, is more in demand by electrical laboratory specialists.

As a result of the operation of devices manufactured by SKB EP, LLC by the personnel of Vorkutinskaya TPP-2, we can say about the reliability and high-quality operation of the above-mentioned devices and express a desire to continue interaction with specialists of SKB EP, LLC on technical and commercial issues.

Currently, in SKTB Granit LLP, we use MIKO-10 micro-ohmmeter manufactured by SKB EP LLC in the amount of 1 piece since 2019.

With the help of MIKO-10, we mainly check the quality of the resistance of the contact groups of protective and functional grounding on newly installed equipment in accordance with the requirements of GOST.

Before MIKO-10 purchase, we have been using F-415 micro-ohmmeter. The weight of this product is about 7-8 kg, which was a great inconvenience in operation. It is much more convenient to work with compact micro-meter MIKO-10 that can be easily fixed on the arm.

In our work, we mostly often use the "Single" measurement mode. We do not check the high-voltage equipment with this device.

With the help of MIKO-10, it is difficult to meet the requirements of GOST 17441-84 "Contact connections. Acceptance rules and test methods", as well as to check the functional grounding of the installed equipment, on the body of which there are no connectors. That is difficult to be performed as MIKO-10 is supplied in the standard complete set only with test cables with a crocodile type clamps.

But for such measurements, a test cable with double hand spikes together with a test cable with a crocodile clip is more suitable.

Here is our offer: to complete the device’s standard complete set with two types of test cables. We think that the price of a test cable with double hand spikes will be small.

[Manufacturer note]: Standard complete set of MIKO-10 includes a cable that is most often used on various types of objects. Unfortunately, cables with double hand spikes are not used so often, so they are included to the additional complete set of the device and are available on request. For more information about the entire list of components, see the Complete set section on MIKO-10 page.

The economic effect of using MIKO-10 micro-ohmmeter was not calculated, but the percentage of detecting low-quality compounds increased significantly.

The device is excellent. We recommend other organizations to use it.

Currently, in the process of conductive cores production at Moskabel Plant, LLC, MIKO-10 microohmmeter is used for post-operative control during the adjustment of the production of TPJ of 1-2 flexibility class according to GOST 22483-2012 to determine the resistance of TPJ. The compact size of the device allows it to be used in conditions of limited space, at the same time, the readings of the device differ in one area within a series of consecutive measurements.

[Manufacturer note]: The results obtained with the help of MIKO-10 can vary within ±0.2%, this is the stated accuracy value of the instrument. For more information about the technical specifications, see the Specifications section on the MIKO-10 page.

At the moment, the use of MIKO-10 enables reducing the filling length by 1-3 meters.

As of now, we can recommend the use of MIKO-10 with great caution in the conditions of manufacturers of cable and wire products.

Since 2017 Electrotechnical laboratory of the Urengoy branch of Gazprom Energo, LLC has been operating MIKO-10 and MIKO-21 micro-ohmmeters and also MIKO-8M(A) milli-ohmmeter. These devices are used to measure the resistance of switching devices, power and measuring transformers, and electric motors.

The advantages of the operated devices include small dimensions and weight, the presence of built-in power sources in MIKO-10 and MIKO-21 micro-ohmmeters, a simple and intuitive interface.

[Manufacturer note]: MIKO-8M(A) milli-ohmmeter also has a built-in power supply. It can be supplied both without a battery: MIKO-8M version, and with it: MIKO-8MA version.

During the operation, all devices have proven themselves on the good side, there are no malfunctions or failures. In comparison with the previous versions of measuring devices, MIKO-10, MIKO-21 and MIKO-8M(A) have become more efficient, which allows, in addition to the high accuracy of the measurements obtained, to reduce the work time due to the simpler assembly of the measurement circuit.

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.

Small-sized wrist micro-ohmmeter MIKO-10 manufactured by SKB EP, LLC was purchased by the Testing Center in July 2019, in order to replace E6-18 milliohmmeter, that no longer meet the required accuracy characteristics or test conditions.

MIKO-10 have been used during standard, periodic, certification tests of products manufactured by Elektrovypryamitel, PJSC, for:

• the electrical resistance grounding measurement of current-carrying parts accessible to touch;
• measurement of electrical resistance to direct current.

During the operation the following positive aspects were revealed:

• the device is compact, lightweight and has several ways of fixing and while operating hands remain free, that is necessary for measurements record;
• the device is simple-to-operate, also it is possible to save the results to a computer;
• the device is listed in the State Register of the Russian Federation;
• good operation independence.

There is one disadvantage revealed. During operation, the device switches off automatically. We have to turn it on with the power button, while the charge level is normal, and can’t cause device’s shutdown.

[Manufacturer note]: The specialists of our Service Center considered your problem and prepared recommendations: charge the device within 3-4 hours, empty the archive, take 10-20 measurements with SINGLE mode and then take 10-20 measurements in AUTO mode. If you have additional questions about MIKO-10 operation, you can always contact us. We recommend you to send your MIKO-10 device to our Service Center.

A.I. Kraynov
Head of the Testing Centre of Elektrovypryamitel, PJSC

Responding to your letter № 27523 from 03/23/2021 with a request for feedback on the instrument, we can inform:

1. Since 2008 our branch has been operating five high-voltage circuit breaker analyzers of PKV/M7 type and three micro-ohmmeters of MIKO-10 type.
2. With a help of these instruments we check: HV circuit breakers of such types as VMG-133, VMG-145, Siemens LTB-145; VMP-10 etc. and the contact resistance of control modules.
   • PKV/M7 is convenient because it has position transducers which are suitable for drivers that are listed above. Also, it is easy to use PKV/M7, its display is clear and size is small. An additional advantage is that the memory of the instrument is programmed by drivers’ and HV circuit breakers’ parameters’ templates, which are in operation in our enterprise.
   • MIKO-10 is convenient due to its small size. It keeps the battery charge for a long time. It is used for measuring the contact resistance of disconnecting switches of the following types: RZD-N 0, RZD-35, RLND-35 and helps quickly control equipment defects. Moreover, it allows to analyze the increase of contact resistance.

3. The instrument provides a complete picture of drive`s technical state and qualitatively measures parameters of its contact part.
4. Monitoring instruments for high-voltage circuit breakers revealed a non-simultaneous commutation in three-pole circuit breakers of the VMG-10 type with a PP-67 drive, during the repair program in 2021. That is why the defect was promptly eliminated and we prevented a serious technical problem.

D.A.Vorobtsov
Acting Director of Branch

Since July 7 till now the Dimitrovgradsky metallurgical plant, LLC, has been using the MIKO-10 microohmmeter. The instrument was used for measuring the electric resistance of copper items. 13 samples of copper busbars were tested with the help of the instrument. MIKO-10 is a multifunction instrument, it is portable, easy to operate; its menu is rather friendly. It is a portable independent measurement device, it is simple to operate and rather robust. The instrument demonstrated proper operation, there were no failures. The MIKO-10 can be recommended for use by other companies.

The MIKO-10 microohmmeter is a portable option of instruments for electric resistances measurements that are manufactured by SKB EP, LLC.

The device has been operated by electrotechnical division of SEVERSTROY Construction Company since September, 2016 for testing the 10/0.4kV electric units of newly constructed and modernized industrial plants.

It was used for control and measurement of transient resistances of wired and metal connections of electric potential balancing systems, switching equipment of electric units during their wiring, commissioning and acceptance tests.

Undisputable merits of the instrument include:

• Different ways of positioning the instrument during measurements;
• Availability of non-volatile memory;
• Automatic measurement start-up and stop, switching out if the instrument is not used;
• Beeping the measurements start-up and termination.

As of today the MIKO-10 is an optimum option of price-quality ratio among instruments for analyzing the condition of 10/0.4kV electric units.