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Winding Resistance Meter


RealTimeSystems introduces advanced high current, digital, direct reading, microprocessor based Automatic Transformer Winding Resistance Meter to measure the D.C. resistance of power transformers and other high inductive electrical devices. With a fast initial settling time this ohmmeter provides the best overall solution to DC resistance testing of transformers. Single or Dual channel measurement of primary or primary and secondary transformer winding resistance is displayed on a large Graphic LCD /LED screen to 4½ digit resolution. The measurement is based on four wire ratio method which eliminates the requirement of lead compensation. The meter is equipped with correct polarity check and indication of charging and discharging of transformer winding

Description

SGX0WRM is suitable for use in the charged switchyard upto 420kV. In addition the special circuits employed limit the L di/dt effects that can give rise to noise and unstable readings.The built-in data storage, interfacing to PC, thermal printer & discharge circuit features makes it suitable for a wide range of factory, on-site plant measurement and performance testing applications.

The SGX0WRM is microprocessor based with menu driven options selected via front panel controls. With electronic calibration, the instrument can be easily recalibrated against known external standards. Usercontrolled internal software allows data logging and storage of measurements in the instruments internal memory. The RS232 interface enables stored data to be downloaded to a computer.

Applications

  • Transformer DC winding resistance
  • Generator stator/rotor resistance
  • Large motors
  • Power utility sub-stations
  • Transformer tap-changer operation and contact tests
  • Factory testing to international standards.
  • Transformer “Heat-run” tests
  • Power connections and circuit breaker testing

Options

Product SG10WRM SG25WRM SG50WRM
Range

200μΩ to 800Ω (Auto range)

0.2mΩ to 200Ω (Auto-range)  1mΩ to 1000Ω (Auto range)
Resolution  4½ digits

4½ digits
Best Resolution: 0.1μΩ at 1mΩ range

 4½ digit (0.1μΩ at 1mΩ range)
D.C. Current ranges 10A and 1A 25A & 12A upto 50A(Auto range)
Accuracy

± 0.2% of rdg ± 2 digits (up to 25Ω)
± 0.5% of rdg ± 2 digits (25Ω to 800Ω)

± 0.1% of rdg ± 2 digits /

± 0.25% of rdg ± 2 digits

± 0.1% of rdg ± resolution of rng
Suitable to  charged switchyard upto 420kV. charged switchyard upto 420kV. charged switchyard upto 420kV
No. of Channels  2/3
PC Interface  RS232  RS232  RS232
Temperature range  0 to 50 deg. C   0 to 50 deg. C   0 to 50 deg. C
 Humidity  95% RH non condensing  95% RH non condensing  95% RH non condensing
 Protection

Over temperature by solid state sensor.
Thermal management: Bycooling fans.

Over temperature by solid state sensor.
Thermal management: Bycooling fans.

Over temperature by solid state sensor.
Thermal management: Bycooling fans.

 Accessories

Test leads- 1Set
Power Cord- 1No.
Operational manual- 1No.
Test certificate- 1No.

Test leads- 1Set
Power Cord- 1No.
Operational manual- 1No.
Test certificate- 1No.

Test leads- 1Set
Power Cord- 1No.
Operational manual- 1No.
Test certificate- 1No.

 Optional Accessories Thermal Printer

Data Transfer Software
Heat Run Test Module
OLTC Test Module

Data Transfer Software
Heat Run Test Software