product overview

Measuring the DC resistance of transformer windings is an important test item. In the "Power Equipment Test Regulations", it is ranked second in the transformer test items. The regulations stipulate that the DC resistance of transformer windings must be measured during transformer handover, major repairs, minor repairs, changes in tap positions, fault inspections, and pre tests. The purpose is to:
① Check the welding quality of the internal wires and leads of the winding;
② Check whether the contact of each position of the tap changer is good;
③ Check for any broken windings or lead wires;
④ Check the correctness of the parallel branch and whether there is a situation where the winding formed by several parallel wires has one or several broken wires;
⑤ Check for short circuits between layers and turns.
The interface design of this instrument adopts microcomputer control, with a large backlit Chinese character LCD screen display. It is easy to operate, has clear display, and friendly human-computer interaction interface. The measurement process and instrument working status prompts are clear and sufficient, without the need for operators to memorize too many procedures; The use of current source linear compensation technology ensures stable testing, high measurement accuracy, and fast speed, improving measurement efficiency and reducing the workload of operators. Technically, "four terminal" measurement is adopted to eliminate measurement errors caused by lead resistance and contact. It has overvoltage protection function and can prevent back electromotive force impact. The panel printer can quickly print measurement results (optional). Small size, light weight, and easy to carry.
This instrument is suitable for measuring and analyzing inductive low resistance resistors such as power transformers and transformer windings.

Product characteristics

1. Intelligent instrument controlled by microcomputer, capable of storing test results
2. Large screen backlit Chinese character LCD display, easy to operate, clear display, user-friendly interface, clear and sufficient measurement process and instrument working status prompts
3. The DC resistance rapid tester adopts current source linear compensation technology, which ensures stable testing, high measurement accuracy, and fast speed, improves measurement efficiency, and reduces the workload of operators
4. Technically, "four terminal" measurement is adopted to eliminate measurement errors caused by lead resistance and contact
5. Panel printer can quickly print measurement results (optional)
6. Has overvoltage protection function, can prevent back electromotive force impact
7. Small size, light weight, easy to carry
8. This DC resistance rapid tester is suitable for measuring and analyzing inductive and low resistance resistance of various power transformers, transformer windings, etc

Product parameters

Main technical indicators:
Measurement range: 0-2000 Ω. (Six levels in total)
Test current: 5A (20m Ω~2 Ω); 0.5A(20Ω); 0.05A(200Ω) ; 0.005A (2000 Ω).
Resolution: 1 μ Ω (20m Ω range); 10 μ Ω (200m Ω range); 0.1m Ω (2 Ω range); 1m Ω (20 Ω range); 10m Ω (200 Ω range); 0.1 Ω (2000 Ω range).
Accuracy: 1m Ω~2000 Ω (± 0.5% RDG+2 d)
2.2 Other:
Whole machine power consumption: ≤ 100W
Working temperature and humidity: 0 ℃~40 ℃; ≤ 85 % RH
Voltage withstand: AC1.5kV 50HZ 1min
Working power supply: AC220V 50HZ (± 10%)
Dimensions: 350mm (L) × 260mm (W) × 140mm (D)
Weight: Approximately 3kg

Other name

DC resistance speed testerDC resistance testerTransformer windingDC resistance testerTransformer direct resistance speed tester, transformer direct resistance fast tester