МИКО-8(eng)
+7 (3952) 719-148
ООО «СКБ ЭП»

Address: Lermontov Str., 130, Off. 226, Irkutsk, Russia, 664033

Main site of «SKB EP», LLC: www.skbpribor.ru

+7 (3952) 719-148

skb@skbpribor.ru

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MIKO-8

Production of the device is discontinued. A new version of MIKO-8M with be delivered to the warehouse in the second quarter of 2018. 

  • The instrument measures the electric resistance of windings of power and instrument transformers, of electric motors, electromagnets, etc.

  • It is an advanced version of MIKO-7 with expanded functions.

  • It performs diagnosis-in-place of transformer LTC.

  • It compensates errors due to external thermal emf.

  • The instrument is supplied with a color graphic display.

Similar instruments

MIKO-7 with basic functions
MIKO-7 with advanced functions

Comparison of devices

  • Conversion of the resistance of linear windings into phase ones, which simplifies search for the damaged winding;
  • Construction of the appraisal curve of contactors operation without opening the LTC tank.
Download commercial proposal

Measurement parameters

Range of measurement 10 mkOhm ÷ 10 kOhm automatic selection of the measurement range.
Time of measurement from 10 sec time depends on inductance of the measured object. Maximum measurement time on the ОРДЦ-533000/330000 transformer  is 7 min 51 sec.
Error of electric resistance measurement ± [0.001R + 0.5] mkOhm R - measured resistance.
Instrument current amperage 0.0014÷10.0 A automatic selection of the instrument current range.
Instrument current drift 0.0002 %/sec. in a minute after the measurements start.
Maximum output voltage 22 V ensures rapid growth of instrument current in the inductive circuit.
Limits of specified output power 0,3; 1; 5; 20; 62 W

Instrument parameters

Power supply
network voltage 100÷242 V
100÷300 V
power voltage from the battery 11÷14 V
Maximum consumed power 120 W
Parameters of a instrument block
L x W x H 270×250×130 mm high operating currents at small size.
weight 3,2 kg
Working temperature

−20 ÷ +40ºС

the instrument is subjected to acceptance tests at a temperature of ambient air from -30 to +50ºС.

Operating conditions

IP rating of the instrument
IP for transportation IP64 in closed state the instrument can be subjected to different impacts and does not require specific conditions for transportation.
IP rating in operating state IP20
Rating of protection from current injury I instrument current is never exceeded; polarity reversal of cable ends and self-inductance of electromotive force in case of occasional cable disconnection are eliminated.
Warranty period 3 years
Service life 10 years
Inter-testing period 3 year

Demonstration of the instrument operation

Connect the instrument or to the electric network (220 W) or to a battery (12 W)

Simultaneous power supply from the network and the battery is not recommended.

Connect the red clamp of the cable to a plus  battery terminal, the black one connect to minus —  battery terminal.

Connect the instrument cable to the instrument.

Any end of the instrument cable can be connected to any grounded or non-grounded end of a three-phase winding using any connection diagram in any sequence.

Replacement of three arrows ↓↓↓ by two ↓↓, then by one ↓ means continuous resistance reduction. Hence, the process of resistance identification is normal. If arrows are replaced by an asterisk * the measurement can be stopped.

When data on the current amperage and resistance appear, stop the measurements by pressing «Start/Stop».

Back to the Menu

Resistance has been identified.

The Table shows the measured resistance and amperage of the instrument current.

Furthermore, the device has automatically computed:

  • value of measured resistance reduced to the passport temperature;
  • difference between measured and passport values of resistance;
  • winding temperature.

Back to the Menu

The Table shows the results of measurements for all the three windings.

MIKO-8 has automatically computed:

  • value of measured resistance reduced to the passport temperature;
  • difference between measured and passport value of the winding resistance;

MIKO-8 additionally computes relative deviations of measured resistances of windings between one another — δR.

Conversion of linear resistances into phase ones shows which winding is damaged. At the moment you see that winding A gives higher resistance (Ra=908,41 mΩ).

Back to the Menu

MIKO-8 the method that allows determination of LTC state without removing the tank cover.

In this mode MIKO-8 checks the state of current-limiting resistors and selector operation, measures time intervals of contactor operation, assesses the state of contact paths of LTC devices.

To go over to the results, press «Start/Stop».

Вернуться в Menu

Please keep in mind that when switching over LTC from position 5 into position 6 (similarly, from position 19 to position 20) the amperage considerably falls as compared to other switchings-over. This fact evidences the problem in the fixed contacts.

Scale up the curve

Back to the Menu

At no-fault LTC contactor there shall be four points of amperage measurement on the curve, whereas we see only three points. At the section 100,05 — 100,062 sec. the amperage dropped below 0,1 А. Most probably, one of the fixed contacts has burnt over.

This example demonstrates that using MIKO-8 you can find an exact fault location without opening LTC.

Scale down the curve.

Back to the Menu

To select the measurement, press →.

To review the stored results of measurements, press «Enter».

Back to the Menu.

Please keep in mind that when switching over LTC from position 5 into position 6 (similarly, from position 19 to position 20) the amperage considerably falls as compared to other switchings-over. This fact evidences the problem in the fixed contacts.

Scale up the curve

To go back to archive, press «Cancel»,

Back to the Menu

At no-fault LTC contactor there shall be four points of amperage measurement on the curve, whereas we see only three points. At the section 100,05 — 100,062 sec. the amperage dropped below 0,1 А. Most probably, one of the fixed contacts has burnt over.

Scale down the curve

Back to the Menu

To select the measurement, press →

To review the stored results of measurements, press «Enter».

Back to the Menu

The Table shows the results of measurements for all the three windings.

MIKO-8 has automatically computed:

  • value of measured resistance reduced to the passport temperature;
  • difference between measured and passport value of the winding resistance;

MIKO-8 additionally computes relative deviations of measured resistances of windings between one another — δR.

Conversion of linear resistances into phase ones shows which winding is damaged. At the moment you see that winding A gives higher resistance (Ra=908,41 mΩ).

To go back to archive, press «Cancel».

Back to the Menu

To select the measurement, press →

Measured resistance and amperage are given below the table. The device additionally computed:

  • winding temperature,
  • value of measured resistance reduced to passport temperature.

Back to the Menu

Measurement is in progress

Когда отобразятся данные по силе и сопротивлению тока, остановить измерение нажав «Стоп».

График измерения.

Чтобы испытать прибор методом DRM, нажмите «Пуск»

Чтобы выйти, нажмите «Ввод».

Испытания прибора методом DRM закончено. Отображается результат.

Чтобы выйти, нажмите «Ввод».

Disconnect the instrument from the network

Disconnect the instrument from battery

Complete set

Instrument block of MIKO-8
A set of wires and attachments
SKB031.23.00.000 Main cable
SKB010.01.00.000 Ground wire
Two  safety devices ВП2Б-1В-2А
Cable USB 2.0 A→B
SKB023.15.00.000 Gauging equivalent of zero resistance
SKB126.06.02.000 Bag №2
Documentation
SKB131.00.00.000OM
SKB131.00.00.000TP


Operations Manual 
Technical passport 
Gauging Certificate 
CD with documentation and software

Additional accessories (for extra pay)

SKB032.18.00.000

Instrument cable, 8.5 m 
"crocodiles" with jaws opening of up to 37 mm.
SKB032.12.00.000

Instrument cable, 8.5 m
measurement from ground (35 kV), from the transformer cover (35÷500 kV), "crocodiles" with jaws opening of up to 80 mm.
SKB032.19.00.000



Instrument cable, 3 m 
resistance measurement following the four-terminal circuit in the inductive and non-inductive circuits. Two probes with red insulation and two probes with black insulation, "crocodiles" A25C.
SKB23.21.00.000
SKB23.21.00.000-01
Potential clip contact
Two items (red and black) for convenient connection to the input studs (for cable SKB032.12.00.00).
SKB032.25.00.000 An additional resistor
For in-place LTC control at full winding resistance below 0.5 Ohm.
SKB031.20.00.000 Extender for instrument cables 6.5 m.
SKB031.17.00.000 Cable for power supply from the battery 5 m.
SKB032.13.00.000
SKB032.13.00.000-01
SKB032.13.00.000-02
Short-circuiting cable (G-cramp G50(2"))
Short-circuiting cable (G-cramp G75 (3''))
Short-circuiting cable (G-cramp G100 (4''))
СКБ126.06.00.000 A bag for cables and documentation

Operations Manual, Passport, Certificates, methodological materials