Transformer on load tap changer tester

Transformer on load tap changer testerIntroduction:

Using a variable ratio bridge to measure the transformation ratio of a transformer is cumbersome to operate and has a narrow measurement range, which is no longer suitable for the fast-paced and high-efficiency requirements of modern measurement. The variable ratio tester adopts modern electronic technology and has developed a new generation of fully automatic variable ratio testers, which have the advantages of small size, light weight, high accuracy, and good stability. The ratio tester adopts a large screen LCD Chinese character display and menu operation, with a clear interface. The ratio group can be measured in one go. The ratio tester is an ideal testing instrument for the power industry sector. According to IEC and relevant national regulations, the transformer ratio tester must conduct a transformer ratio test on semi-finished and finished products during the transformer production process, as well as newly installed and overhauled transformers before they are put into operation. In the preventive testing regulations of the Ministry of Electric Power, it is required to regularly measure the transformation ratio of operating transformers. By conducting a transformer ratio test, the turns ratio of the transformer winding and the condition of the tap changer can be checked to determine whether there are defects such as inter turn short circuits in the transformer, and whether it can be operated in parallel, thereby ensuring the safe use of the equipment.

application

Transformation ratio testing is one of the routine testing items in the manufacturing and maintenance process of transformers. The transformation ratio tester is designed with modern electronic technology, and the instrument operation is controlled by a microcontroller. Its large LCD screen can intuitively display three-phase transformation ratio, error, tap position and other information. The instrument is designed with a longitudinal testing function for tap windings, which can automatically determine the tap position and store the corresponding transformation ratio value. This instrument is suitable for transformation ratio testing of various wiring groups of transformers, including Z-type.

Transformer on load tap changer testerMain technical indicators

1. Three independent test power supplies, with a large output power supply of 1A;
2. Set the sampling rate of the instrument to 10~20KHZ;
Single waveform large storage time of 6.4 seconds.
4. Transition resistance measurement range: Y/△ type transformer ≤ 40 Ω, Y type transformer ≤ 20 Ω.
5. Measurement accuracy: △ ≤ 10%
Measurement synchronicity error: 0.2ms.
7. Display: 240 × 128T, T6963 controller;
⒏ Printer: MP-40-8 panel type front paper exchange printer;
9. Processing section:
80C320 high-speed 8-bit microprocessor. Program memory 32K;
Maintain 512K bytes of data storage during power failure;
High speed A/D converter with a high sampling rate of up to 400KHZ;
Power supply 220V ± 10%, power ≤ 200W.
Size: 410mm × 320mm.
Weight ≤ 7kg
Random attachments: 4 test wires, 4 crocodile test pliers