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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.
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.
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 microohmmeter, milliohmmeter, thermometer and even kiloohmeter 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.
This mode is designed for measuring transfer resistances of any switching devices as well as of demountable and nondemountable contact connections in the range within 1 µOhm ÷ 105 µOhm. Moreover, this mode allows considering the availability or absence of current in the measured circuit of transformer.
When measuring transfer resistances of contacts and connections questions regarding the strength of the measuring current arise as in case of dry contacts the result of measurement will be falsely high. That is why the main requirements to microohmeters are the following: provision of quite heavy operating current which allows burning of acidified film forming on contacts and giving significant error at resistance measuring.
MIKO-2.3 surpasses all foreign- and home-produced microohmmeters. The closest foreign analogue microohmeter with the current of 500A has the weight of 7.5 kg and mains supply. At the same time MIKO-2.3 with its weight of only 2.7 kg produces current of 1,000А. It is particularly true about dead-tank circuit breakers of MKP and U type, the contact circuit of which contains up to eight series-connected arcing contacts and two main contacts which means that they are more sensitive to corrosion and repair labour input is bigger due to the great amount of oil in the tank.
MIKO-2.3 complies with the international standard IEC 60694 "Common specifications for high-voltage switchgear and controlgear standards" (International Electrotechnical Commission (IEC)), specifying current strength for microohmmeters from 50А to the nominal current of the measured item which excludes erroneous diagnostics results.
The instrument has an archive for storing the results of measurements in "microohmmeter" mode; meant for storing of 62 measuring results. For each measurement the value of resistance, current strength and measurement date/time are stored in the archive.
Data transmission to the computer and filing of measurement results is performed with the help of a special program developed by the manufacturer.
It is designed for measurement of direct-current resistance in circuits with high inductance (transformers, electromagnets etc.) within the range of 0.1 mOhm-106 mOhm.
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:
The appliance has an archive for storage of results of changing the "milliohmmeter" 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.
It is designed for measurement of resistance of potential dividers, ballast, closing and other resistors in terms of considerable interference and induced voltage within the range of 0.1 kOhm-3*102 kOhm.
It is designed for measurement of temperatures of windings, oil and air within the range of -20°C to +120°C.
Switching on each of four modes occurs automatically when appropriate input cable from the instrument set is connected.
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.
Light weight and self-contained supply (charge time is 3 to 5 min) give an opportunity to use MIKO-2.3 not while standing on ground, but while being on a switch cover or in a cradle scaffold. That is why the length and weight of cables of MIKO-2.3 are significantly lesser, and one can go down and up the equipment only once instead of two times in case of measurement with a ground-based appliance.
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 clamps of "alligator clip with ground clamp" type 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 remote potential contacts.
|
Specifications |
Value |
|
"Microohmeter" mode: |
- |
|
Electric resistance measuring range, µOhm |
0.1 ÷ 100,000 |
|
Maximum permissible intrinsic relative error of electric resistance measurement, % |
±0.2 |
|
Measuring current intensity range during electric resistance measurement in "CT (current transformer)-available" and "CT-not available" submodes, А |
10 ÷ 900 |
|
Measuring current intensity range during electric resistance measurement in "CT-available Тmax" submode, А |
100 ÷ 400 |
|
Maximum time of one measurement in "CT-not available" submode, sec |
2 |
|
Maximum time of one measurement in "CT-available" submode, sec |
30 |
|
Maximum time of one measurement in "CT-available Тmax" submode, sec |
20 |
|
"Milliohmmeter" mode: |
- |
|
Electric resistance measuring range, mOhm |
0.1 ÷ 1,000,000 |
|
Maximum permissible intrinsic relative error of electric resistance measurement, % |
±0.2 |
|
Measuring current intensity range during electric resistance measurement, А |
0.5 ÷ 5 |
|
One measurement time, sec |
10 ÷ 900 |
|
"Kiloohmmeter" mode: |
- |
|
Electric resistance measuring mode, kOhm |
0.1 ÷ 300 |
|
Maximum permissible intrinsic relative error of electric resistance measurement, % |
±0.5 |
|
Value of induced voltage across the resistor, kV |
≤ 5 |
|
Maximum time of one measurement, sec |
3 |
|
"Thermometer" mode: |
- |
|
Temperature measuring range, °С |
-20 ÷ +120 |
|
Maximum permissible intrinsic absolute error of temperature measurement, °С |
±1.0 |
|
Maximum accumulator charge time, min |
5 |
|
Maximum power consumed in the power circuit, W |
60 |
|
Operation temperature range, ºС |
-20 ÷ +40 |
|
Maximum measuring unit weight, kg |
2.7 |
|
Dimensions, mm |
150х190х75 |
|
Interface language |
English |
|
User manuals language |
English |
|
Calibration period, year |
1 |
| Photo | Item, Index | Application |
|---|---|---|
 |
MIKO-2.3 measuring unit SKB025.01.00.000 | The instrument and accompanying documents: calibration certificate, operation manual and record book. |
 |
3U-1A charging device SKB023.20.00.000 | For charging of the accumulator during measurement of resistance on electric equipment. |
 |
K162 microohmmeter cable SKB023.02.00.000-01 | For measurement of resistance of oil (U-110; MKP-110; VMT-110 types), air (ВВОА-15 type) and gas-insulated high-voltage circuit breakers (VGU-220; VGV-110; ZAR1DT-145; ZNM428; VGBU-110; VGB-330 types). Clamps of "alligator clip + ground clamp" type (length 2.3 m + 1.1 m). |
 |
Potential spring-loaded contact (2 pcs.) SKB023.21.00.000/-01 | For connection to the input pin. Included into the complete set of the K162 measuring cable. |
 |
Potential pin contact (2 pcs.) SKB023.22.00.000/-01 | For connection to the input pin. Included into the complete set of the K162 measuring cable. |
 |
K233 milliohmmeter cable SKB023.07.00.000-02 | For measurement of resistance of power transformer windings with the voltage of 110 kV and less under direct current. Input pin diameter is up to 37 mm (length 6.0 m + 2.0 m). |
 |
K322 kiloohmmeter cable SKB023.06.00.000-01 | For measurement of multiplier, shunt and dividing resistances in case of presence of induced voltage for them (length 3.4 m + 2.1 m). |
 |
Thermometer with K411 cable SKB023.08.00.000 | For measurement of oil, water and air temperature (length 1.8 m). |
 |
RS-232 interface cable SKB023.11.00.000 | For transmission of measurement results to a computer as well as for control of the instrument via a PC (length 1.5 m). |
 |
Mains extension cable SKB023.16.00.000 | For connection of the charging device when placing the instrument on the input of the high-voltage circuit breaker. |
 |
Test shunt 75ШСМ МЗ-0,5 | Functional check in microohmmeter and milliohmmeter modes. The value is 1 mOhm ± 0.5%. |
 |
Zero resistance equivalent SKB023.15.00.000 | Accuracy check of the zero point on the resistance scale. The value is 0,000 µOhm. |
 |
Instrument transportation bag SKB123.02.01.000 | |
 |
Bag for a cable set SKB23.02.02.000 |
| Photo | Item, Index | Application |
|---|---|---|
 |
K161 microohmmeter cable SKB023.02.00.000 | For measurement of resistance of oil (all for 6, 10 and 35 kV), air (VBB-10; VVE-35; VVChP-15 types) and gas-insulated high-voltage circuit breakers (VGT-110; ZAR2F1; VGV-35; VGU-110; ZAR1FE; VGT-110; ZNM427.04980; VGB-35 types). Clamps of “alligator clip + ground clamp” type (length 0.9 m + 0.9 m). The maximum current up to 1000A. |
 |
K163 microohmmeter cable SKB023.02.00.000-02 | For measurement of resistance of oil (U-220; MKP-220; VMT-220 types in case of work on a hoist), air (VV-330B; VVBK-110; VVBK-220; VVD-220B; VVS-220B; VVU-110G; VVBM-110B; VVS-110B; VVBK-220 types) and gas-insulated high-voltage circuit breakers (ZAR2F1; VGU-220; VGU-330; VGB-220; ZNM427.07465 types). Clamps of “alligator clip + ground clamp” type (length 4.5 m + 1.0 m). The maximum current up to 500A. |
 |
K164 microohmmeter cable SKB023.02.00.000-03 | For measurement of resistance of oil (U-220; MKP-220; VMT-220 types in case of work without a hoist). Clamps of “alligator clip + ground clamp” type (length 3.8 m + 1.7 m). The maximum current up to 500A. |
 |
K165 microohmmeter cable SKB023.02.00.000-04 | For measurement of resistance of air (VNV-330; VV-500B; VVBK-500; VDN-330Б; VNV-330; VNV-500; VVDM-330B types) and gas-insulated high-voltage circuit breakers (VGU-500; VGB-750; VGB-500; VGB-330). Clamps of “alligator clip + ground clamp” type (length 10.0 m + 1.0 m). The maximum current up to 500A. |
 |
K154 microohmmeter with contacts SKB023.05.00.000 | Cable with two needle contacts – potential contact is spring-loaded. Applied in case of impossibility of connection to the facility using cables with clamps of “alligator clip + ground clamp” type. For example, in control of collecting and connecting buses. For pairwork (length 1.0 m + 1.9 m). |
 |
K155 microohmmeter cable with contacts SKB023.13.00.000 | Cable with one needle contact and one clamp of “alligator clip + ground clamp” type. Applied in case of impossibility of connection to the facility using cables with clamps of “alligator clip + ground clamp” type. Allows working alone (length 0.9 m + 2.3 m). |
 |
K121 microohmmeter cable with contacts SKB023.09.00.000 | Cable with removable probes and removable small clamps of "alligator clip" type. It is used along with one of K161 ÷ K165 cables for measurement of resistance in any area between connection points of clamps of "alligator clip + ground clamp" type. Cable length (standard length 1.8 m + 1.8 m) can be changed on demand. |
 |
Cable for microohmmeter with quick-operating ground clip | Cable for control of high-voltage switches with input pins with diameter of over 80 mm. The cable clamp is equipped with a quick-operating ground clip that ensures instant connection to input pins due to availability of a button at its bottom. One can instantly place a clamp on a pin by pushing the button and fix it reliably by tightening a ground clip screw against stop. High reliability of the fastening excludes the possibility of the cable breakdown. Cable length (standard length 0.9 m + 0.9 m) can be changed on demand. |
 |
K238 milliohmmeter cable SKB023.07.00.000-06 | Cable for measurement of resistance of direct current of power transformer windings with the voltage of 500 kV and less (pin input diameter up to 37 mm.) In case MIKO-2.3 is placed on the transformer cover (length 6.5 m + 6.5 m). |
 |
K236 milliohmmeter cable SKB023.07.00.000-04 | Cable for measurement of resistance of direct current of power transformer windings with the voltage of 110 kV and less (input pin diameter is up to 37 mm). In case MIKO-2.3 is placed on the ground (length 9.0 m + 9.0 m). |
 |
K239 milliohmmeter cable SKB023.25.00.000 | Cable for measurement of resistance of direct current of power transformer windings with the voltage of 500 kV and less (the diameter of an input pin is up to 80 mm). In case MIKO-2.3 is placed on the transformer cover (length 6.5 m + 6.5 m). |
 |
К240 extension cable SKB023.24.00.000 | An extension cable for combined operation with K238 and K239 measuring cables. In case MIKO-2.3 is placed on the ground (length 8.5 m). |
 |
K235 milliohmmeter cable SKB023.23.00.000 | Cable for measurement of resistance on direct current of electric motors, electromagnets, current transformers etc. (length 3 m). |
 |
K321 kiloohmmeter cable SKB023.06.00.000 | Cable for measurement of multiplier, shunt and dividing resistances in the presence of induced voltage (length 2.1 m + 3.4 m). |
