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TRM Series
TRM Series - Image 2

TRM Series

Winding Resistance Meter

TRM Series Winding Resistance Meters are designed for field testing as well as for factory testing of large rotating machines & transformers up to 1000MVA, 765kV class under live switchyard conditions. DC Winding Resistance values of highly inductive objects like transformers, generators, motor etc. are directly displayed. A backlit LCD with a user-friendly menu sets up the instrument for the test. These meters are protected against the back-emf offered by large inductive windings.
  • 50V DC open circuit voltage for quick stabilization of current
  • Injects up to 25/50 A current and measures resistance up to 2000Ω
  • Has 3/6* Resistance channels, 3/6* Test Current channels and one Temperature input channel
  • Temperature measurement channel and   automatic  temperature correction of winding resistance for copper & aluminium windings
  • One-time connection and simultaneous measurement on three phases of primary or / and* secondary windings
  • It is not necessary to compensate lead resistance, as Kelvin’s four wire measurement method is used
  • OLTC operation and automatic measurement of resistance at all tap positions with indication of OLTC discontinuity, if any
  • Automatic and fast back-emf discharge with indication
  • Demagnetization facility available
  • 7” colour TFT display with touch screen and interactive menu offers easy user interface
  • Inbuilt memory and thermal printer Displays, prints and stores test reports in the form of text header and tabulated test results
  • Can be operated in stand-alone mode or by control through external computer
  • Powerful Windows based software, CTrans TRM offers to setup, operate, capture, view and analyse test data. Test Report can also be generated
  • Housed in rugged IP 67 class molded carrying case for enhanced transport – worthiness
  • The instrument is supplied with Test Lead Set suitable for testing EHV transformers & RTD temperature sensor
  • Type Tested as per IEC 60068, IEC 61326, IEC 61010 & IEC 61000, CE marked
  • OLTC dynamic test facility with current v/s time graph. (Optional)

 

OLTC Dynamic Testing Feature

Tap changer failures account for a significant number of failures on power transformers. OLTC failures are caused by degradation of OLTC contacts. SCOPE offers dynamic OLTC test facility with TRM to identify weaknesses in the OLTC assembly. The test is conducted in computer control mode at higher sampling speed of 10KHz

  • This test records variation in current flowing through the OLTC during tap change, against time
  • Gives % drop in current and transition time
  • The drop in current during OLTC transition indicates change in transition resistance
  • It is also possible to calculate transition time which shows health of mechanism
  • This optional feature extends the capability of the basic instrument making it ideal test equipment for testing of transformers.

TECHNICAL DATA

Full Product Specifications

ParametersTRM 14TRM 104TRM 25 / TRM 25+TRM 50 / 50+
Resistance Channels223 / 63 / 6
Temperature ChannelNot Available1
Selectable Current

Ranges

1A, 0.1A, 0.01A10A, 1A, 0.1A, 0.01A25A, 10A, 5A, 1A,

0.1A, 0.01A

50A, 40A, 25A, 10A,

5A, 1A, 0.1A, 0.01A

Resistance RangeUp to 2000ΩUp to 2000Ω Auto ranging
Best Resolution1μΩ0.1μΩ
AccuracyValue ± 0.5% ± 2 digits
Open Circuit Voltage30V DC50V DC
ProtectionBack-EMF, Over temperature, Accidental disconnection of leads
Back-emf DischargeAutomatic
DemagnetizationNot AvailableYes
OLTC Discontinuity

Indication

Yes
Temperature

Correction

Not AvailableYes (For Aluminium & Copper)
Display4 line 20 character backlit LCD5.7”, 320 x 240 pixels TFT touch screen display
MemoryNot Available100 DUT IDs with 5000 results each
Inbuilt PrinterNot AvailableThermal printer
Communication PortNot AvailableEthernet
Dimensions (mm)475 x 405 x 175475 x 405 x 230630 x 500 x 305630 x 500 x 305
Instrument Weight10 kg15 kg26 kg28 kg
OLTC Dynamic Test

Facility (Optional)

Not Available1 or 3 channels

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