Multipurpose low / high resistance meter MIKO-2.3

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.

K. Chernohaev
Director

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

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.

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.

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.

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.

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.

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.

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.

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