The measurement of DC resistance of transformer is a mandatory test item for semi-finished and finished products in transformer manufacturing during the course of delivery test, installation, commissioning test and preventive test of power sector, which can effectively find out the manufacturing defects such as imperfect material selection and welding, loose connections, missing strands and broken wires of transformer coils as well as hidden dangers after operation. The VS-3310A Automatic
Transformer DC Resistance Tester is a rapid test equipment for measuring DC resistance of transformers, instrument transformer, generators and motor windings, especially suitable for the simultaneous measurement of three phases of large-capacity star-connected transformers as well as the magnetism measurement of three-phase, five-column or low-voltage delta-connected transformers, thus greatly saving time and improving the efficiency of overhaul. I.
Main features
All DC resistance data for high and low voltage windings can be measured with connection for only one time.
For transformer with neutral point, its three phases can be measured at the same time, with great time saving.
For three-phase, five-column, delta-connected transformer, its low-voltage windings can be measured through the saturable magnetic circuit method with fast speeds.
Demagnetization function eliminating residual magnetism in a single pass.
Wide resistance measurement range and high resolution, with multiple current steps to choose from.
Sophisticated back-EMF protection.
The longitudinal testing of DC resistance of on-load regulating transformers can be done in a single pass.
Highly accuracy as well as anti-interference, shockproof and easy to carry features.
Easy operation with a 5.0" 65K colour touch screen.
Built-in high-capacity non-volatile memory for 500 sets of data.
Built-in high-speed micro thermal printer for printing measurement data.
Built-in high-precision clock for real-time time display.
USB storage function available.
Technical parameters
Three-phase test:
Test current Resistance range Accuracy
20A (2*10) 500μΩ~500mΩ ±(0.2%rdg+1.0μΩ)
10A (2*5) 10mΩ~1.0Ω ±(0.2%rdg+0.01mΩ)
2A (2*1) 100mΩ~5.0Ω ±(0.2%rdg+0.1mΩ)
0.2A (2*0.1) 1Ω~50Ω ±(0.2%rdg+0.001Ω)
Single phase test:
Test current Resistance range Accuracy
20A 250μΩ~1.0Ω ±(0.2%rdg+0.5μΩ)
10A 2mΩ~2.0Ω ±(0.2%rdg+0.002mΩ)
5A 50mΩ~4.0Ω ±(0.2%rdg+0.05mΩ)
1A 100mΩ~20Ω ±(0.2%rdg+0.1mΩ)
0.1A 1Ω~200Ω ±(0.2%rdg+0.001Ω)
Resolution: 0.0001 μΩ, 5 significant digits
Mainframe size: 420mmx 250mmx 340mm
Mainframe weight: 15kg
Ambient temperature: -10°C to 50°C
Ambient humidity: ≤85℅RH, non-condensing
Operating power supply: AC220V ±10%
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