• Delivery RET-MOM.2in stock
  • Warranty 5 years
  • Price on-demand

RET-МОМ.2 is a high-accuracy microohmmeter, an instrument of “Kalibr” series (accuracy class of 0.1%), designed for measurements within a wide range of 10 µOhm … 500 Ohm with test current within 10 mA … 10 A range. It is used for measuring winding resistance of power transformers of any capacity, instrument CT and VT, stators and rotors of generators and motors, solenoids of different relays and disconnectors.

Measuring low resistance values of 10 µOhm and above also enables using RET-МОМ.2 in tests of other substation components: contacts of HV circuit-breakers, disconnectors, short-circuiters, bus joints, welded and bolt joints, power conductor line sections, etc.

To take measurements, the user can simply connect to the tested object and press Start/Stop button. All processes such as setting of test current, resistance measuring, adjusting resistance to the set temperature, saving results and safe transformer demagnetizing are fully automated.

Measurement mean time is below 30 s. To accelerate OLTC-based transformer rating, there is special OLTC mode for continuous current injection throughout the whole test cycle.

Mobile and Compact

RET-МОМ.2 is easy-to-use thanks to its low weight (7 kg) and compact dimensions (280х240х185 mm). The built-in battery enables instrument operation in stand-alone mode, enabling taking more than 500 measurements without recharge. If required, the microohmmeter can operate on mains power supply while battery is charged.

Delivery Set

The delivery set of RET-МОМ.2 instrument includes:

  • Microohmmeter RET-МОМ.2
  • Set of documents
  • Accessories:
    • RET-МОМ.2 bag
    • KI-МОМ.2 measuring cable
    • МОМ.2 extension cable
    • grounding cable
    • network cable
    • USB cable

Warranty

SPE “Dymanics” guarantees high quality and reliability of RET-МОМ.2 test instrument during 5 years from the date of delivery.

Basic technical data. Resistance measuring

Parameter

Value

Resistance measuring range, Ohm

0.00001-500

Limits of permissible basic relative DC resistance measurement accuracy:

- within 10 … 500 µOhm range, %

- within 500 µOhm … 500 Ohm range, %

 

 ±50*/X

±0.1

Limits of permissible additional resistance measurement error caused by ambient temperature change is max. 0.25 of the basic error limit per 10°C

Kind of test current

DC

Test current value, А

0.01; 0.,1; 1.0; 10

Maximum output power, W, not more than

60

Output voltage, V

0 … 24

Maximum measurement time, min, not more than

10

Note – The following notation is used in error formulae:
Х is measured value, µOhm.

50* is permissible basic absolute error value multiplied by 100% (0.5 µOhm*100%);

General technical data

Parameter

Value

Protection degree acc. to GOST 14254-2015:

- in operating position

- in transport position

 

IP20

IP64

Safety requirements acc. to GOST 12.2.091-2002:

- insulation

- installation category (overvoltage category)

- microenvironment pollution degree

 

basic

CAT II

2

Insulation strength test voltage (AC voltage, frequency 50 Hz), V

- mains supply circuits to enclosure

  

1500

Insulation resistance between enclosure and galvanically isolated live instrument parts, MOhm, min.

40

Shock hazard protection

GOST 12.2.007.0-75 Class I

EMC requirements acc. to GOST R IEC 61326-1-2014

- equipment class

 

А

Number of measurements with fully charged battery

500**

Weight, kg, max.

7

Overall dimensions, mm, max.

280 х 240 х 185

500** is average value that depends on connected load current and resistance.

Operating conditions

Parameter

Value

Temperature of normal conditions, °С

20 ± 5

Operating temperature range, °С

- 20 … + 50

Transportation temperature, °С

- 50 … + 70

Storage temperature, °С

- 50 … + 70

Relative humidity, %, max.

95

Atmospheric pressure, kPa

79 … 106.7

Altitude, m, max.

2000

Group of operating conditions acc. to GOST 17516.1-90

М23

Instrument power supply

- built-in Pb - battery, V

- mains, V

- frequency, Hz;

- rated power consumption, V?A, max.

 

12

187-264

45 – 65

200

Reliability parameters

Parameter

Value

Mean service life time of instruments, years, min.

30

Mean time between failures, h, min.

25,000

Mean time to recovery including fault location time, hours, max.

3

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