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.
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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 (200 x 151 x 68 mm; 2.7 kg) MIKO-2.3 achieves cutting edge innovation, while the above features and self-contained power supply ensure full portability and high mobility of the instrument over the vast territory of substation or facility.
The ability of MIKO-2.3 to supply current up to 1000A is realized due to the operation of a condenser battery. The presence of such type of a battery provides full charging of the instrument from 0% to 100% in 5 minutes! Nevertheless, rapid discharge also occurs in some modes of the instrument operation, that determines the dependence of MIKO-2.3 on electrical network. In order to eliminate this nuance, SKB EP has developed an external battery of a modern lithium-ion type which has received the symbol – power bank. The main task of the power bank for MIKO-2.3 is to maintain the charge of its built–in condenser battery to increase the operating time of the instrument and raise the number of measurements without connecting to the network - more details at the link.
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.
Operation time with the use of Power bank ZU-2A in the milli-ohmmeter mode
2.5 hrs
Number of measurements with the use of Power bank ZU-2A in the micro-ohmmeter mode
400 pcs
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)
100-242 V AC, 47-63 Hz 100-300 V DC
Dimensions
200 x 151 x 68 mm
Instrument weight
2.7 kg
Environmental protection
IP20
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
Photo
Item, Index
Application
Main instrument MIKO-2.3
025.01.00.000
Main instrument MIKO-2.3
025.01.00.000
Instrument, a stand for the instrument, and documents: User Manual and Log book.
Charging unit CU-1A
023.20.00.000
Charging unit CU-1A
023.20.00.000
For charging the built-in condenser battery of the instrument during resistance measurement on electrical equipment.
Micro-ohmmeter test cable K162
023.02.00.000-01
Micro-ohmmeter test cable K162
023.02.00.000-01
Micro-ohmmeter test cable 1 x 2.3 m + 1.1 m with C-clamps, jaw up to 80 mm. 900А. Weight is 2.12 kg.
Potential spring-loaded contact (2 pcs.)
023.21.00.000/-01
Potential spring-loaded contact (2 pcs.)
023.21.00.000/-01
For connection to the input pin. Included into the complete set of the K162 measuring cable.
Potential probe (2 pcs.)
023.22.00.000/-01
Potential probe (2 pcs.)
023.22.00.000/-01
For connection to the input pin. Included into the complete set of the K162 measuring cable.
Milli-ohmmeter test cable K233
023.07.00.000-02
Milli-ohmmeter test cable K233
023.07.00.000-02
Milli-ohmmeter test cable 1 x 6m + 2m with input pin diameter up to 37 mm. Jaw up to 50 mm.
For resistance measurement of power transformer windings with the voltage of 110 kV and less under direct current.
Kilo-ohmmeter test cable K322
023.06.00.000-01
Kilo-ohmmeter test cable K322
023.06.00.000-01
Kilo-ohmmeter test cable 1 x 3.4m + 2.1m. Jaw up to 50 mm.
For measurement of additional, shunt and dividing resistances in case of presence of induced voltage for them.
Thermometer with cable K411
023.08.00.000
Thermometer with cable K411
023.08.00.000
Thermometer cable 1 x 1.8m. For temperature measurement of oil, water and air.
Mains extension cable
023.16.00.000
Mains extension cable
023.16.00.000
Mains cable 1 x 11 m. Weight 0.68 kg.
For charging device connection when placing the instrument on the input of the high-voltage circuit breaker.
RS-232 interface cable
023.11.00.000
RS-232 interface cable
023.11.00.000
Interface cable 1 x 1.5m. For PC connection and data transfer.
Shunt
Shunt
Type: 75ShSM M3 (75ШСМ М3). For functional check in micro-ohmmeter and milli-ohmmeter modes.
Zero resistance standard
023.15.00.000
Zero resistance standard
023.15.00.000
Accuracy check of the zero point on the resistance scale. The value is 0,000 µOhm.
Instrument transportation bag
123.02.01.000
Instrument transportation bag
123.02.01.000
Convenient and durable bag, providing additional mobility during the operation of the device.
Weight 0.3 kg.
Bag for a cable set
123.02.02.000
Bag for a cable set
123.02.02.000
Convenient and durable bag for transporting cables and accessories.
Weight 0.85 kg.
Additional complete set (on order)
Photo
Item, Index
Application
Charging unit ZU-2A
025.21.00.000
Charging unit ZU-2A
025.21.00.000
The unit functions as Power bank for the charge maintenance of the built-in condenser battery of the instrument. Battery charge maintenance time is up to 2.5 hours during continuous measurement in the milli-ohmmeter mode, and for not less than 400 measurements in micro-ohmmeter mode.
Micro-ohmmeter test cable K161
023.02.00.000
Micro-ohmmeter test cable K161
023.02.00.000
Kelvin C-clamp test cable (jaw up to 80 mm) 1 x 0.9m + 0.9m. Maximum current up to 1000A. Weight is 2.3 kg.
Micro-ohmmeter test cable K163
023.02.00.000-02
Micro-ohmmeter test cable K163
023.02.00.000-02
Micro-ohmmeter test cable (jaw up to 30 mm) 1 x 4.5m + 1m with crocodile clip and G-cramp. Maximum current up to 500A.
Micro-ohmmeter test cable K164
023.02.00.000-03
Micro-ohmmeter test cable K164
023.02.00.000-03
Micro-ohmmeter test cable (jaw up to 30 mm) 1 x 3.8m + 1.7m with crocodile clip and G-cramp. Maximum current up to 500A.
For resistance measurement of oil high-voltage circuit breakers.
Micro-ohmmeter test cable K165
023.02.00.000-04
Micro-ohmmeter test cable K165
023.02.00.000-04
Micro-ohmmeter test cable (jaw up to 30 mm) 1 x 10m + 1m with crocodile clip and G-cramp. Maximum current up to 500A.
Micro-ohmmeter test cable K151
023.03.00.000
Micro-ohmmeter test cable K151
023.03.00.000
Kelvin Clamp test cable, jaw up to 50 mm. Current up to 200A. Length 0.9m. + 0.9m. Weight is 1 kg.
Micro-ohmmeter test cable K152
023.03.00.000-01
Micro-ohmmeter test cable K152
023.03.00.000-01
Kelvin Clamp test cable, jaw up to 50 mm. Current up to 200A. Length is 2.27m. + 0.9m. Weight is 1.78 kg.
Micro-ohmmeter test cable K153
023.03.02.000
Micro-ohmmeter test cable K153
023.03.02.000
For resistance measurement of: air high-voltage circuit breakers and SF6 high-voltage circuit breakers.
Current up to 200A. Jaw up to 30 mm. Length 5.0m. + 5.0m.
Micro-ohmmeter test cable K121
023.09.00.000
Micro-ohmmeter test cable K121
023.09.00.000
Micro-ohmmeter cable 1 x 1.8m + 1.8m (can be changed on demand) with removable probes and removable small crocodile clips.
To be used along with one of K161 - K165 cables for resistance measurement in any area between crocodile clips and G-cramps connection points.
Micro-ohmmeter test cable K154
023.05.00.000
Micro-ohmmeter test cable K154
023.05.00.000
Micro-ohmmeter double hand spike test cable 1 x 1.1m + 1.9m (potential contact is spring-loaded).
Applied in case of impossibility of equipment connection using cables with crocodile clips and G-cramps. For pairwork.
Micro-ohmmeter test cable K155
023.13.00.000
Micro-ohmmeter test cable K155
023.13.00.000
Kelvin C-clamp test cable 1 x 0,9 m + 2,3 m (jaw up to 50 mm). Potential contact is spring-loaded. Current up to 200A. Weight is 1.34 kg.
Milli-ohmmeter test cable K236
023.07.00.000-04
Milli-ohmmeter test cable K236
023.07.00.000-04
Milli-ohmmeter test cable (jaw up to 30 mm) 1 x 9m + 9m (input pin diameter up to 37 mm).
For resistance measurement of direct current of power transformer windings with the voltage of 110 kV and less. In case MIKO-2.3 is placed on the ground.
Milli-ohmmeter test cable K238
023.07.00.000-06
Milli-ohmmeter test cable K238
023.07.00.000-06
Milli-ohmmeter test cable (jaw up to 50 mm) 1 x 6.5m + 6.5m (input pin diameter up to 37 mm).
For resistance measurement of direct current of power transformer windings with the voltage of 500 kV and less. In case MIKO-2.3 is placed on the transformer cover.
Milli-ohmmeter test cable K239
023.25.00.000
Milli-ohmmeter test cable K239
023.25.00.000
Milli-ohmmeter test cable (jaw up to 70 mm) 1 x 6.5m + 6.5m (input pin diameter up to 80 mm).
For resistance measurement of direct current of power transformer windings with the voltage of 500 kV and less. In case MIKO-2.3 is placed on the transformer cover.
Milli-ohmmeter extension test cable K240
023.24.00.000
Milli-ohmmeter extension test cable K240
023.24.00.000
Extension cable 1 x 8.5m.
For combined operations with K238 and K239 test cables. In case MIKO-2.3 is placed on the ground.
Milli-ohmmeter test cable K235
023.23.00.000
Milli-ohmmeter test cable K235
023.23.00.000
Milli-ohmmeter cable 1 x 3m. For resistance measurement on direct current of electric motors, electromagnets, current transformers, etc.
With 2 probes and 4 crocodile clips (jaw up to 25 mm) (length: 30 mm, plug: 3 mm) for contact resistance measurement of CT and VT contact joints and windings.
Kilo-ohmmeter test cable K321
023.06.00.000
Kilo-ohmmeter test cable K321
023.06.00.000
Kilo-ohmmeter cable (jaw up to 30 mm) 1 x 0.8m + 0.8m.
For measurement of additional, shunt and dividing resistances in the presence of induced voltage.
Manipulating rod
010.41.00.000 010.41.00.000-01 010.41.00.000-02
Manipulating rod
010.41.00.000 010.41.00.000-01 010.41.00.000-02
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 100 A in the presence of a good contact.
Manipulating rod - 2.2 (length 2.2 m / weight as an assembled set 3.4 kg);
Manipulating rod - 3.7 (length 3.7 m / weight as an assembled set 4.0 kg);
Manipulating rod - 5.1 (length 5.1 m / weight as an assembled set 4.6 kg).
Official reviews from customers based on the results of operating SKB EP instruments are available upon request. Please, fill out the form on the website.