HZ-3320B Three Channels 20A Transformer DC Resistance Test Equipment

The operation panel of the tester is shown below

winding resistance tester

Fig. 1

1) IA, IB, IC, IO terminals: Current input terminals /output terminals for YN winding measurement;

2) VA, VB, VC, VO terminals: Voltage input terminals for YN winding measurement;

3) Ia, Ib, Ic terminals: Current input terminals /output terminals for D or Y winding measurement;

4) Va, Vb, Vc terminals: Voltage input terminals for D or Y winding measurement;

5) Printer: To print the resistance test results and other information;

6) Display: 7-inch color touch LCD screen, to display operation menu, test parameters and data records;

7) Power switch and socket: Including the main power switch and the 220V AC power socket of the whole machine;

8) Grounding terminal: It is used for grounding the whole machine case for grounding protection;

9) USB port: It is the port to connect the tester with U disk and used to export the test data from the memory;

10) RS232 communication port: It is the communication port between the tester and the host computer.

Functional Characteristics

The tester can select corresponding output current value according to test products, and is mainly suitable for measuring the inductive DC resistance on transformers;

On large transformers with a five-leg core and low-voltage windings connected in delta, the tester can be used for the test in HV & LV series excitation mode. The magnetic augment circuit of the windings can be automatically connected in the tester, to quickly and accurately test the DC resistance of the low-voltage windings;

The tester has a Three Phases Test function to measure the three-phase DC resistance of the star-connected windings synchronously and calculate the three-phase unbalance rate automatically, so as to greatly reduce the measurement period and improve the test efficiency. Its phase by phase test function can also be used for phase by phase test on transformers with YN and D (Y) connections;

The winding material can be set according to the winding material of the transformer, such as copper or aluminum, to distinguish the conversion temperature coefficient of different materials.

The tester is equipped with transformer YN winding neutral point lead line resistance detection function, can make three-phase test data closer to the single-phase test value.

The tester has a complete protection circuit and sound discharge alarm, to inform the clear discharge indication and reduce the misoperation;

The tester is equipped with a 7-inch color touch screen. to display the test data clearly in real-time;

The tester has Chinese and English operation interfaces, which can be configured according to the user requirements;

The tester is equipped with a RS232 communication port, to transmit the test data to the background, with the control software in the host computer;

The tester is equipped with a USB port, to transfer test data into a U disk;

The tester has a built-in calendar and clock, as well as saving ( save 100 groups of data), review, and printing functions of test data;

The tester has more complete parameter settings, including test windings, Tapping Positions, test phases, Tested Sample Temperature, Conversion Temperature and others of the transformers;

The tester is equipped with an industrial plastic case which ensures its good portability and improves its service life.

Technical Indicators

Output current:

Three-phase test: 10A+10A; 5A+5A; 1A+1A; 200mA+200mA; 20mA+20mA;

Single-phase test: 20A; 10A; 5A; 1A; 200mA; 20mA;

Measurement range:

Three-phase test: 10A+10A: 1mΩ～0.6Ω;

5A+5A: 2mΩ～1.2Ω;

1A+1A: 10mΩ～6Ω;

200mA+200mA: 100mΩ～30Ω；

20mA+20mA: 10Ω～200Ω；

Single-phase test: 20A: 0.5mΩ～1Ω;