Functional Characteristics
1) The tester can select corresponding output current value according to test products, and is mainly suitable for measuring the inductive DC resistance on transformers;
2) 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;
3) 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;
4) 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.
5) 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.
6) The tester has a complete protection circuit and sound discharge alarm, to inform the clear discharge indication and reduce the misoperation;
7) The tester is equipped with a 7-inch color touch screen. to display the test data clearly in real-time;
8) The tester has Chinese and English operation interfaces, which can be configured according to the user requirements;
9) 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;
10) The tester is equipped with a USB port, to transfer test data into a U disk;
11) 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;
12) The tester has more complete parameter settings, including test windings, Tapping Positions, test phases, Tested Sample Temperature, Conversion Temperature and others of the transformers;
13) The tester is equipped with an industrial plastic case which ensures its good portability and improves its service life.
Technical Indicators
1) Output current:
Three-phase test: 5A+5A; 1A+1A; 200mA+200mA; 20mA+20mA;
Single-phase test: 10A; 5A; 1A; 200mA; 20mA;
2) Measurement range:
Three-phase test: 5A+5A: 2mΩ～1.2Ω;
1A+1A: 10mΩ～6Ω;
200mA+200mA: 100mΩ～30Ω；
20mA+20mA: 10Ω～200Ω；
Single-phase test: 10A: 1mΩ～2Ω;
5A: 2mΩ～4Ω;
1A: 10mΩ～20Ω;
200mA: 100mΩ～100Ω;
20mA: 10Ω～20KΩ;
3) Accuracy: ±(0.2%+2 digits);
4) Minimum resolution: 0.1μΩ;
5) Operating temperature: -10～40℃;
6) Ambient humidity: ≤80%RH, no condensation;
7) Power supply: AC220V±10%, 50Hz±1Hz;
8) Tester dimensions: 428mm* 350mm* 230mm (L*W*H);
9) Tester mass: 10.8kg.
Notes
Before reversing the tap connections in the test of no-load voltage regulating transformers, be sure to reset the tester, wait till the end of the discharge process and the alarm stops. Before removing the wires, be sure to wait till the discharge process completes and the discharge alarm stops.
When the three channels are used, because the initial establishment of the magnetic circuit may take longer when testing the first set of data, the stabilization time can be shortened when the tap connections are reversed.