The transformer DC resistance tester is a new generation of fast tester that integrates the magnetizing method test and three-phase simultaneous test. The maintenance of the transformer DC resistance tester is an ideal device for measuring the DC resistance of large power transformers.
I. Main Features
?The transformer DC resistance tester maintenance connects all high and low voltage current potential test lines to the transformer at once, and there is no need to reverse the test lines during the test process;
?For star-connected winding tests, the instrument can adopt a three-phase simultaneous test method to test the resistance of A0, B0, and C0 phases, saving test time;
?When testing the low voltage side of a three-phase five-column transformer with internal delta connection, the instrument uses an automatic magnetizing method internally, which is faster than directly using a large current test and reduces the harm caused by large residual magnetism after large current testing;
?Displays and prints all test data of the high, medium, and low voltage windings of the transformer, and automatically calculates the three-phase unbalance rate. It can also print the resistance value converted to the rated temperature;
?In three-phase testing, the A0 data is tested first, then the three phases are tested simultaneously, solving the problem that the neutral point lead resistance cannot be tested during three-phase simultaneous testing, and the test data is closer to the single-phase test value;
?Has complete back electromotive force protection function;
?The transformer DC resistance tester maintenance instrument can store 200 test data items internally (expandable), and can also use a USB flash drive to store data for easy import into a computer for processing;
?The instrument has the characteristics of wide applicable temperature, high precision, shock resistance, anti-interference, and portability.
II. Main Technical Indicators and Usage Conditions
1. Technical Indicators
1) Test Current:
Three-phase test: 5A+5A 1A+1A two gears
Split-phase test: 10A, 5A, 1A three gears
2) Test Range: 10A: 500.0uΩ ~1Ω
5A: 10mΩ ~4Ω 5A+5A 10mΩ ~1Ω
1A: 100mΩ ~20Ω 1A+1A 100mΩ ~5Ω
3) Minimum Resolution: 0.1uΩ
4) Accuracy: ±(0.2%+2 digits)
5) Dimensions: 435mm×300mm×225mm
6) Weight: 12kg (excluding test leads)
2. Usage Conditions
1) Ambient Temperature: -10℃ ~ 50℃
2) Ambient Humidity: ≤ 85%RH
3) Working Power Supply: AC220V ± 10%
4) Power Frequency: (50±1)Hz
III. Panel Function Introduction
