TRM Series

Winding Resistance Meter

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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.

Key Features & Capabilities

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

Parameters	TRM 14	TRM 104	TRM 25 / TRM 25+	TRM 50 / 50+
Resistance Channels	2	2	3 / 6	3 / 6
Temperature Channel	Not Available		1
Selectable Current Ranges	1A, 0.1A, 0.01A	10A, 1A, 0.1A, 0.01A	25A, 10A, 5A, 1A, 0.1A, 0.01A	50A, 40A, 25A, 10A, 5A, 1A, 0.1A, 0.01A
Resistance Range	Up to 2000Ω		Up to 2000Ω Auto ranging
Best Resolution	1μΩ	0.1μΩ
Accuracy	Value ± 0.5% ± 2 digits
Open Circuit Voltage	30V DC		50V DC
Protection	Back-EMF, Over temperature, Accidental disconnection of leads
Back-emf Discharge	Automatic
Demagnetization	Not Available		Yes
OLTC Discontinuity Indication	Yes
Temperature Correction	Not Available		Yes (For Aluminium & Copper)
Display	4 line 20 character backlit LCD		5.7”, 320 x 240 pixels TFT touch screen display
Memory	Not Available		100 DUT IDs with 5000 results each
Inbuilt Printer	Not Available		Thermal printer
Communication Port	Not Available		Ethernet
Dimensions (mm)	475 x 405 x 175	475 x 405 x 230	630 x 500 x 305	630 x 500 x 305
Instrument Weight	10 kg	15 kg	26 kg	28 kg
OLTC Dynamic Test Facility (Optional)	Not Available		1 or 3 channels

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