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.
Capital-Stroy Diagnostics, LLC
Review to PKV/M7 circuit breaker analyzer
In 2019, our company purchased PKV/M7 device. After studying the User Manual that is competently compiled by the specialists of SKB EP, LLC, the engineers of Capital-Stroy Diagnostics, LLC started to run measurements on 110 kV circuit breakers. It is worth noting that VGT-110 SF6 circuit breakers have different design features depending on the manufacturer, however, this was not reflected in the measurement circuit assembly instructions.
PKV/M7 device has shown its best. It provides enough information to determine the technical condition of the circuit breakers, has a convenient interface and is easy to operate.
In particular, we would like to note the good work of the technical support service of SKB EP, LLC that promptly helps to deal with issues that might arose.
We recommend PKV/M7 device to the companies that are involved in operating and diagnostics of high-voltage circuit breakers.
Review to MIKO-9A milliohmmeter
In 2019, our company purchased MIKO-9A device to measure ohm resistances of 110 kV power transformers. After studying the device documentation and carrying out reference measurements (reference resistance is included into device complete set) engineers of Capital-Stroy Diagnostics, LLC started working with MIKO-9A milliohmmeter. Significant advantages and minor disadvantages were revealed while working with MIKO-9A on 110 kV power transformers, in comparison with other similar devices.
Among the advantages, it is worth noting high accuracy of the measurements, large battery capacity, and most importantly, transformer demagnetization function. This feature reduces the time spent on measurements and reduces bulky equipment amount that we had to use previously. User-friendly interface, an ability to connect the cables to all three phases simultaneously, and an ability to run measurements with an automatic switch between the windings by the device itself significantly reduce total operating time and simplify the measurement process.
One of the disadvantages is a long time of windings saturation, despite 10 Amps test current that is supplied to the windings by the device. With each tap switch of the OLTC the device saturates the winding for quite a long time.
[Manufacturer comment: To check winding resistance of the power transformer with an OLTC it is highly recommended to use Manual measurement mode.
Before measurement start you have to set OLTC to the first or to the last tap, and then start the measurement. Device will magnetize the winding and show resistance value. Then, without measurement stop, you need to switch OLTC to the next tap, and the device will almost immediately display the next resistance value. You must also indicate on the device display that this is the next tap. This method will significantly reduce total measurement time.
After resistance measurement on all phases and taps, it is necessary to save the results. All values will be displayed in the archive of this object.]
We recommend MIKO-9A milliohmmeter to the companies that are engaged in the operation, repair and diagnostics of electrical equipment.
Slutsk Electric Networks (RUE Minskenergo)
We have been operating MIKO-8M(A) milliohmmeter for two years, and the advantages of the device are the following:
- compact size;
- informative menu;
- availability of the DRM test;
- possibility of use on high-inductive equipment.
The disadvantage is a small internal memory for information storing.
MIKO-8M(A) milliohmmeter deserves a high rating according to its characteristics. We are looking forward to new developments.
Individual Entrepreneur LanovoyOur company has been using the MIKO-7M microohmmeter since May 2020.
A positive point device using in a production environment is protection against external mechanical influences and adverse weather conditions. In our work, it is necessary to carry out a large number of measurements of a 35 kV transformer with a power of up to 1600 kVA. For these needs, the specialists selected MIKO-7M and MIKO-8M instruments, however, given the clearly defined testing mechanism, the MIKO-8M functionality was redundant for us. An important role in choosing a device was played by price and, due to these factors, a decision was made to purchase MIKO-7M.
The instrument copes with its tasks good, we can recommend it for use by other companies.
We give our consent to post reviews on the site.
United Techno Service, LLCOur laboratory, on the recommendation of your specialist, purchased a small-sized microohmmeter MIKO-10 manufactured by SKB EP, LLC. Using the instrument leaves a positive feeling. We especially want to highlight its compactness, ease of use and performance at low temperatures. Not every instrument can brag about it. The instrument case is assembled efficiently, there are no backlashes and creaks. The settings menu is intuitive, autonomy is good, accuracy and measurement speed are also at a high level. The insulation of the measuring cables ensures that they remain flexible even at low ambient temperatures.
As for the minuses, the connectors stick and give a little inconvenience when plugging in or unplugging, it would be more convenient make connectors like "banana". We would also like measuring cables with a spring-loaded pin contact to be in paired with the instrument, not as additional equipment.
Our laboratory recommends the MIKO-10 to purchase.